1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11 */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h> /* HDIO_GETGEO */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/compat.h>
22 #include <linux/init.h>
23 #include <linux/seq_file.h>
24
25 #include <asm/css_chars.h>
26 #include <asm/debug.h>
27 #include <asm/idals.h>
28 #include <asm/ebcdic.h>
29 #include <asm/io.h>
30 #include <linux/uaccess.h>
31 #include <asm/cio.h>
32 #include <asm/ccwdev.h>
33 #include <asm/itcw.h>
34 #include <asm/schid.h>
35 #include <asm/chpid.h>
36
37 #include "dasd_int.h"
38 #include "dasd_eckd.h"
39
40 #ifdef PRINTK_HEADER
41 #undef PRINTK_HEADER
42 #endif /* PRINTK_HEADER */
43 #define PRINTK_HEADER "dasd(eckd):"
44
45 /*
46 * raw track access always map to 64k in memory
47 * so it maps to 16 blocks of 4k per track
48 */
49 #define DASD_RAW_BLOCK_PER_TRACK 16
50 #define DASD_RAW_BLOCKSIZE 4096
51 /* 64k are 128 x 512 byte sectors */
52 #define DASD_RAW_SECTORS_PER_TRACK 128
53
54 MODULE_LICENSE("GPL");
55
56 static struct dasd_discipline dasd_eckd_discipline;
57
58 /* The ccw bus type uses this table to find devices that it sends to
59 * dasd_eckd_probe */
60 static struct ccw_device_id dasd_eckd_ids[] = {
61 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
62 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
63 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
64 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
65 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
66 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
67 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
68 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
69 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
70 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
71 { /* end of list */ },
72 };
73
74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
75
76 static struct ccw_driver dasd_eckd_driver; /* see below */
77
78 static void *rawpadpage;
79
80 #define INIT_CQR_OK 0
81 #define INIT_CQR_UNFORMATTED 1
82 #define INIT_CQR_ERROR 2
83
84 /* emergency request for reserve/release */
85 static struct {
86 struct dasd_ccw_req cqr;
87 struct ccw1 ccw;
88 char data[32];
89 } *dasd_reserve_req;
90 static DEFINE_MUTEX(dasd_reserve_mutex);
91
92 static struct {
93 struct dasd_ccw_req cqr;
94 struct ccw1 ccw[2];
95 char data[40];
96 } *dasd_vol_info_req;
97 static DEFINE_MUTEX(dasd_vol_info_mutex);
98
99 struct ext_pool_exhaust_work_data {
100 struct work_struct worker;
101 struct dasd_device *device;
102 struct dasd_device *base;
103 };
104
105 /* definitions for the path verification worker */
106 struct pe_handler_work_data {
107 struct work_struct worker;
108 struct dasd_device *device;
109 struct dasd_ccw_req cqr;
110 struct ccw1 ccw;
111 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
112 int isglobal;
113 __u8 tbvpm;
114 };
115 static struct pe_handler_work_data *pe_handler_worker;
116 static DEFINE_MUTEX(dasd_pe_handler_mutex);
117
118 struct check_attention_work_data {
119 struct work_struct worker;
120 struct dasd_device *device;
121 __u8 lpum;
122 };
123
124 static int dasd_eckd_ext_pool_id(struct dasd_device *);
125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
126 struct dasd_device *, struct dasd_device *,
127 unsigned int, int, unsigned int, unsigned int,
128 unsigned int, unsigned int);
129
130 /* initial attempt at a probe function. this can be simplified once
131 * the other detection code is gone */
132 static int
dasd_eckd_probe(struct ccw_device * cdev)133 dasd_eckd_probe (struct ccw_device *cdev)
134 {
135 int ret;
136
137 /* set ECKD specific ccw-device options */
138 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
139 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
140 if (ret) {
141 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
142 "dasd_eckd_probe: could not set "
143 "ccw-device options");
144 return ret;
145 }
146 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
147 return ret;
148 }
149
150 static int
dasd_eckd_set_online(struct ccw_device * cdev)151 dasd_eckd_set_online(struct ccw_device *cdev)
152 {
153 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
154 }
155
156 static const int sizes_trk0[] = { 28, 148, 84 };
157 #define LABEL_SIZE 140
158
159 /* head and record addresses of count_area read in analysis ccw */
160 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
162
163 static inline unsigned int
ceil_quot(unsigned int d1,unsigned int d2)164 ceil_quot(unsigned int d1, unsigned int d2)
165 {
166 return (d1 + (d2 - 1)) / d2;
167 }
168
169 static unsigned int
recs_per_track(struct dasd_eckd_characteristics * rdc,unsigned int kl,unsigned int dl)170 recs_per_track(struct dasd_eckd_characteristics * rdc,
171 unsigned int kl, unsigned int dl)
172 {
173 int dn, kn;
174
175 switch (rdc->dev_type) {
176 case 0x3380:
177 if (kl)
178 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
179 ceil_quot(dl + 12, 32));
180 else
181 return 1499 / (15 + ceil_quot(dl + 12, 32));
182 case 0x3390:
183 dn = ceil_quot(dl + 6, 232) + 1;
184 if (kl) {
185 kn = ceil_quot(kl + 6, 232) + 1;
186 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
187 9 + ceil_quot(dl + 6 * dn, 34));
188 } else
189 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
190 case 0x9345:
191 dn = ceil_quot(dl + 6, 232) + 1;
192 if (kl) {
193 kn = ceil_quot(kl + 6, 232) + 1;
194 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
195 ceil_quot(dl + 6 * dn, 34));
196 } else
197 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
198 }
199 return 0;
200 }
201
set_ch_t(struct ch_t * geo,__u32 cyl,__u8 head)202 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
203 {
204 geo->cyl = (__u16) cyl;
205 geo->head = cyl >> 16;
206 geo->head <<= 4;
207 geo->head |= head;
208 }
209
210 /*
211 * calculate failing track from sense data depending if
212 * it is an EAV device or not
213 */
dasd_eckd_track_from_irb(struct irb * irb,struct dasd_device * device,sector_t * track)214 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
215 sector_t *track)
216 {
217 struct dasd_eckd_private *private = device->private;
218 u8 *sense = NULL;
219 u32 cyl;
220 u8 head;
221
222 sense = dasd_get_sense(irb);
223 if (!sense) {
224 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
225 "ESE error no sense data\n");
226 return -EINVAL;
227 }
228 if (!(sense[27] & DASD_SENSE_BIT_2)) {
229 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
230 "ESE error no valid track data\n");
231 return -EINVAL;
232 }
233
234 if (sense[27] & DASD_SENSE_BIT_3) {
235 /* enhanced addressing */
236 cyl = sense[30] << 20;
237 cyl |= (sense[31] & 0xF0) << 12;
238 cyl |= sense[28] << 8;
239 cyl |= sense[29];
240 } else {
241 cyl = sense[29] << 8;
242 cyl |= sense[30];
243 }
244 head = sense[31] & 0x0F;
245 *track = cyl * private->rdc_data.trk_per_cyl + head;
246 return 0;
247 }
248
set_timestamp(struct ccw1 * ccw,struct DE_eckd_data * data,struct dasd_device * device)249 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
250 struct dasd_device *device)
251 {
252 struct dasd_eckd_private *private = device->private;
253 int rc;
254
255 rc = get_phys_clock(&data->ep_sys_time);
256 /*
257 * Ignore return code if XRC is not supported or
258 * sync clock is switched off
259 */
260 if ((rc && !private->rdc_data.facilities.XRC_supported) ||
261 rc == -EOPNOTSUPP || rc == -EACCES)
262 return 0;
263
264 /* switch on System Time Stamp - needed for XRC Support */
265 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
266 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
267
268 if (ccw) {
269 ccw->count = sizeof(struct DE_eckd_data);
270 ccw->flags |= CCW_FLAG_SLI;
271 }
272
273 return rc;
274 }
275
276 static int
define_extent(struct ccw1 * ccw,struct DE_eckd_data * data,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * device,int blksize)277 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
278 unsigned int totrk, int cmd, struct dasd_device *device,
279 int blksize)
280 {
281 struct dasd_eckd_private *private = device->private;
282 u16 heads, beghead, endhead;
283 u32 begcyl, endcyl;
284 int rc = 0;
285
286 if (ccw) {
287 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
288 ccw->flags = 0;
289 ccw->count = 16;
290 ccw->cda = (__u32)__pa(data);
291 }
292
293 memset(data, 0, sizeof(struct DE_eckd_data));
294 switch (cmd) {
295 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
296 case DASD_ECKD_CCW_READ_RECORD_ZERO:
297 case DASD_ECKD_CCW_READ:
298 case DASD_ECKD_CCW_READ_MT:
299 case DASD_ECKD_CCW_READ_CKD:
300 case DASD_ECKD_CCW_READ_CKD_MT:
301 case DASD_ECKD_CCW_READ_KD:
302 case DASD_ECKD_CCW_READ_KD_MT:
303 data->mask.perm = 0x1;
304 data->attributes.operation = private->attrib.operation;
305 break;
306 case DASD_ECKD_CCW_READ_COUNT:
307 data->mask.perm = 0x1;
308 data->attributes.operation = DASD_BYPASS_CACHE;
309 break;
310 case DASD_ECKD_CCW_READ_TRACK:
311 case DASD_ECKD_CCW_READ_TRACK_DATA:
312 data->mask.perm = 0x1;
313 data->attributes.operation = private->attrib.operation;
314 data->blk_size = 0;
315 break;
316 case DASD_ECKD_CCW_WRITE:
317 case DASD_ECKD_CCW_WRITE_MT:
318 case DASD_ECKD_CCW_WRITE_KD:
319 case DASD_ECKD_CCW_WRITE_KD_MT:
320 data->mask.perm = 0x02;
321 data->attributes.operation = private->attrib.operation;
322 rc = set_timestamp(ccw, data, device);
323 break;
324 case DASD_ECKD_CCW_WRITE_CKD:
325 case DASD_ECKD_CCW_WRITE_CKD_MT:
326 data->attributes.operation = DASD_BYPASS_CACHE;
327 rc = set_timestamp(ccw, data, device);
328 break;
329 case DASD_ECKD_CCW_ERASE:
330 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
331 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
332 data->mask.perm = 0x3;
333 data->mask.auth = 0x1;
334 data->attributes.operation = DASD_BYPASS_CACHE;
335 rc = set_timestamp(ccw, data, device);
336 break;
337 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
338 data->mask.perm = 0x03;
339 data->attributes.operation = private->attrib.operation;
340 data->blk_size = 0;
341 break;
342 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
343 data->mask.perm = 0x02;
344 data->attributes.operation = private->attrib.operation;
345 data->blk_size = blksize;
346 rc = set_timestamp(ccw, data, device);
347 break;
348 default:
349 dev_err(&device->cdev->dev,
350 "0x%x is not a known command\n", cmd);
351 break;
352 }
353
354 data->attributes.mode = 0x3; /* ECKD */
355
356 if ((private->rdc_data.cu_type == 0x2105 ||
357 private->rdc_data.cu_type == 0x2107 ||
358 private->rdc_data.cu_type == 0x1750)
359 && !(private->uses_cdl && trk < 2))
360 data->ga_extended |= 0x40; /* Regular Data Format Mode */
361
362 heads = private->rdc_data.trk_per_cyl;
363 begcyl = trk / heads;
364 beghead = trk % heads;
365 endcyl = totrk / heads;
366 endhead = totrk % heads;
367
368 /* check for sequential prestage - enhance cylinder range */
369 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
370 data->attributes.operation == DASD_SEQ_ACCESS) {
371
372 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
373 endcyl += private->attrib.nr_cyl;
374 else
375 endcyl = (private->real_cyl - 1);
376 }
377
378 set_ch_t(&data->beg_ext, begcyl, beghead);
379 set_ch_t(&data->end_ext, endcyl, endhead);
380 return rc;
381 }
382
383
locate_record_ext(struct ccw1 * ccw,struct LRE_eckd_data * data,unsigned int trk,unsigned int rec_on_trk,int count,int cmd,struct dasd_device * device,unsigned int reclen,unsigned int tlf)384 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
385 unsigned int trk, unsigned int rec_on_trk,
386 int count, int cmd, struct dasd_device *device,
387 unsigned int reclen, unsigned int tlf)
388 {
389 struct dasd_eckd_private *private = device->private;
390 int sector;
391 int dn, d;
392
393 if (ccw) {
394 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
395 ccw->flags = 0;
396 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
397 ccw->count = 22;
398 else
399 ccw->count = 20;
400 ccw->cda = (__u32)__pa(data);
401 }
402
403 memset(data, 0, sizeof(*data));
404 sector = 0;
405 if (rec_on_trk) {
406 switch (private->rdc_data.dev_type) {
407 case 0x3390:
408 dn = ceil_quot(reclen + 6, 232);
409 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
410 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
411 break;
412 case 0x3380:
413 d = 7 + ceil_quot(reclen + 12, 32);
414 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
415 break;
416 }
417 }
418 data->sector = sector;
419 /* note: meaning of count depends on the operation
420 * for record based I/O it's the number of records, but for
421 * track based I/O it's the number of tracks
422 */
423 data->count = count;
424 switch (cmd) {
425 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
426 data->operation.orientation = 0x3;
427 data->operation.operation = 0x03;
428 break;
429 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
430 data->operation.orientation = 0x3;
431 data->operation.operation = 0x16;
432 break;
433 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
434 data->operation.orientation = 0x1;
435 data->operation.operation = 0x03;
436 data->count++;
437 break;
438 case DASD_ECKD_CCW_READ_RECORD_ZERO:
439 data->operation.orientation = 0x3;
440 data->operation.operation = 0x16;
441 data->count++;
442 break;
443 case DASD_ECKD_CCW_WRITE:
444 case DASD_ECKD_CCW_WRITE_MT:
445 case DASD_ECKD_CCW_WRITE_KD:
446 case DASD_ECKD_CCW_WRITE_KD_MT:
447 data->auxiliary.length_valid = 0x1;
448 data->length = reclen;
449 data->operation.operation = 0x01;
450 break;
451 case DASD_ECKD_CCW_WRITE_CKD:
452 case DASD_ECKD_CCW_WRITE_CKD_MT:
453 data->auxiliary.length_valid = 0x1;
454 data->length = reclen;
455 data->operation.operation = 0x03;
456 break;
457 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
458 data->operation.orientation = 0x0;
459 data->operation.operation = 0x3F;
460 data->extended_operation = 0x11;
461 data->length = 0;
462 data->extended_parameter_length = 0x02;
463 if (data->count > 8) {
464 data->extended_parameter[0] = 0xFF;
465 data->extended_parameter[1] = 0xFF;
466 data->extended_parameter[1] <<= (16 - count);
467 } else {
468 data->extended_parameter[0] = 0xFF;
469 data->extended_parameter[0] <<= (8 - count);
470 data->extended_parameter[1] = 0x00;
471 }
472 data->sector = 0xFF;
473 break;
474 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
475 data->auxiliary.length_valid = 0x1;
476 data->length = reclen; /* not tlf, as one might think */
477 data->operation.operation = 0x3F;
478 data->extended_operation = 0x23;
479 break;
480 case DASD_ECKD_CCW_READ:
481 case DASD_ECKD_CCW_READ_MT:
482 case DASD_ECKD_CCW_READ_KD:
483 case DASD_ECKD_CCW_READ_KD_MT:
484 data->auxiliary.length_valid = 0x1;
485 data->length = reclen;
486 data->operation.operation = 0x06;
487 break;
488 case DASD_ECKD_CCW_READ_CKD:
489 case DASD_ECKD_CCW_READ_CKD_MT:
490 data->auxiliary.length_valid = 0x1;
491 data->length = reclen;
492 data->operation.operation = 0x16;
493 break;
494 case DASD_ECKD_CCW_READ_COUNT:
495 data->operation.operation = 0x06;
496 break;
497 case DASD_ECKD_CCW_READ_TRACK:
498 data->operation.orientation = 0x1;
499 data->operation.operation = 0x0C;
500 data->extended_parameter_length = 0;
501 data->sector = 0xFF;
502 break;
503 case DASD_ECKD_CCW_READ_TRACK_DATA:
504 data->auxiliary.length_valid = 0x1;
505 data->length = tlf;
506 data->operation.operation = 0x0C;
507 break;
508 case DASD_ECKD_CCW_ERASE:
509 data->length = reclen;
510 data->auxiliary.length_valid = 0x1;
511 data->operation.operation = 0x0b;
512 break;
513 default:
514 DBF_DEV_EVENT(DBF_ERR, device,
515 "fill LRE unknown opcode 0x%x", cmd);
516 BUG();
517 }
518 set_ch_t(&data->seek_addr,
519 trk / private->rdc_data.trk_per_cyl,
520 trk % private->rdc_data.trk_per_cyl);
521 data->search_arg.cyl = data->seek_addr.cyl;
522 data->search_arg.head = data->seek_addr.head;
523 data->search_arg.record = rec_on_trk;
524 }
525
prefix_LRE(struct ccw1 * ccw,struct PFX_eckd_data * pfxdata,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev,unsigned int format,unsigned int rec_on_trk,int count,unsigned int blksize,unsigned int tlf)526 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
527 unsigned int trk, unsigned int totrk, int cmd,
528 struct dasd_device *basedev, struct dasd_device *startdev,
529 unsigned int format, unsigned int rec_on_trk, int count,
530 unsigned int blksize, unsigned int tlf)
531 {
532 struct dasd_eckd_private *basepriv, *startpriv;
533 struct LRE_eckd_data *lredata;
534 struct DE_eckd_data *dedata;
535 int rc = 0;
536
537 basepriv = basedev->private;
538 startpriv = startdev->private;
539 dedata = &pfxdata->define_extent;
540 lredata = &pfxdata->locate_record;
541
542 ccw->cmd_code = DASD_ECKD_CCW_PFX;
543 ccw->flags = 0;
544 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
545 ccw->count = sizeof(*pfxdata) + 2;
546 ccw->cda = (__u32) __pa(pfxdata);
547 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
548 } else {
549 ccw->count = sizeof(*pfxdata);
550 ccw->cda = (__u32) __pa(pfxdata);
551 memset(pfxdata, 0, sizeof(*pfxdata));
552 }
553
554 /* prefix data */
555 if (format > 1) {
556 DBF_DEV_EVENT(DBF_ERR, basedev,
557 "PFX LRE unknown format 0x%x", format);
558 BUG();
559 return -EINVAL;
560 }
561 pfxdata->format = format;
562 pfxdata->base_address = basepriv->ned->unit_addr;
563 pfxdata->base_lss = basepriv->ned->ID;
564 pfxdata->validity.define_extent = 1;
565
566 /* private uid is kept up to date, conf_data may be outdated */
567 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
568 pfxdata->validity.verify_base = 1;
569
570 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
571 pfxdata->validity.verify_base = 1;
572 pfxdata->validity.hyper_pav = 1;
573 }
574
575 rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
576
577 /*
578 * For some commands the System Time Stamp is set in the define extent
579 * data when XRC is supported. The validity of the time stamp must be
580 * reflected in the prefix data as well.
581 */
582 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
583 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
584
585 if (format == 1) {
586 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
587 basedev, blksize, tlf);
588 }
589
590 return rc;
591 }
592
prefix(struct ccw1 * ccw,struct PFX_eckd_data * pfxdata,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev)593 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
594 unsigned int trk, unsigned int totrk, int cmd,
595 struct dasd_device *basedev, struct dasd_device *startdev)
596 {
597 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
598 0, 0, 0, 0, 0);
599 }
600
601 static void
locate_record(struct ccw1 * ccw,struct LO_eckd_data * data,unsigned int trk,unsigned int rec_on_trk,int no_rec,int cmd,struct dasd_device * device,int reclen)602 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
603 unsigned int rec_on_trk, int no_rec, int cmd,
604 struct dasd_device * device, int reclen)
605 {
606 struct dasd_eckd_private *private = device->private;
607 int sector;
608 int dn, d;
609
610 DBF_DEV_EVENT(DBF_INFO, device,
611 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
612 trk, rec_on_trk, no_rec, cmd, reclen);
613
614 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
615 ccw->flags = 0;
616 ccw->count = 16;
617 ccw->cda = (__u32) __pa(data);
618
619 memset(data, 0, sizeof(struct LO_eckd_data));
620 sector = 0;
621 if (rec_on_trk) {
622 switch (private->rdc_data.dev_type) {
623 case 0x3390:
624 dn = ceil_quot(reclen + 6, 232);
625 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
626 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
627 break;
628 case 0x3380:
629 d = 7 + ceil_quot(reclen + 12, 32);
630 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
631 break;
632 }
633 }
634 data->sector = sector;
635 data->count = no_rec;
636 switch (cmd) {
637 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
638 data->operation.orientation = 0x3;
639 data->operation.operation = 0x03;
640 break;
641 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
642 data->operation.orientation = 0x3;
643 data->operation.operation = 0x16;
644 break;
645 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
646 data->operation.orientation = 0x1;
647 data->operation.operation = 0x03;
648 data->count++;
649 break;
650 case DASD_ECKD_CCW_READ_RECORD_ZERO:
651 data->operation.orientation = 0x3;
652 data->operation.operation = 0x16;
653 data->count++;
654 break;
655 case DASD_ECKD_CCW_WRITE:
656 case DASD_ECKD_CCW_WRITE_MT:
657 case DASD_ECKD_CCW_WRITE_KD:
658 case DASD_ECKD_CCW_WRITE_KD_MT:
659 data->auxiliary.last_bytes_used = 0x1;
660 data->length = reclen;
661 data->operation.operation = 0x01;
662 break;
663 case DASD_ECKD_CCW_WRITE_CKD:
664 case DASD_ECKD_CCW_WRITE_CKD_MT:
665 data->auxiliary.last_bytes_used = 0x1;
666 data->length = reclen;
667 data->operation.operation = 0x03;
668 break;
669 case DASD_ECKD_CCW_READ:
670 case DASD_ECKD_CCW_READ_MT:
671 case DASD_ECKD_CCW_READ_KD:
672 case DASD_ECKD_CCW_READ_KD_MT:
673 data->auxiliary.last_bytes_used = 0x1;
674 data->length = reclen;
675 data->operation.operation = 0x06;
676 break;
677 case DASD_ECKD_CCW_READ_CKD:
678 case DASD_ECKD_CCW_READ_CKD_MT:
679 data->auxiliary.last_bytes_used = 0x1;
680 data->length = reclen;
681 data->operation.operation = 0x16;
682 break;
683 case DASD_ECKD_CCW_READ_COUNT:
684 data->operation.operation = 0x06;
685 break;
686 case DASD_ECKD_CCW_ERASE:
687 data->length = reclen;
688 data->auxiliary.last_bytes_used = 0x1;
689 data->operation.operation = 0x0b;
690 break;
691 default:
692 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
693 "opcode 0x%x", cmd);
694 }
695 set_ch_t(&data->seek_addr,
696 trk / private->rdc_data.trk_per_cyl,
697 trk % private->rdc_data.trk_per_cyl);
698 data->search_arg.cyl = data->seek_addr.cyl;
699 data->search_arg.head = data->seek_addr.head;
700 data->search_arg.record = rec_on_trk;
701 }
702
703 /*
704 * Returns 1 if the block is one of the special blocks that needs
705 * to get read/written with the KD variant of the command.
706 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
707 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
708 * Luckily the KD variants differ only by one bit (0x08) from the
709 * normal variant. So don't wonder about code like:
710 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
711 * ccw->cmd_code |= 0x8;
712 */
713 static inline int
dasd_eckd_cdl_special(int blk_per_trk,int recid)714 dasd_eckd_cdl_special(int blk_per_trk, int recid)
715 {
716 if (recid < 3)
717 return 1;
718 if (recid < blk_per_trk)
719 return 0;
720 if (recid < 2 * blk_per_trk)
721 return 1;
722 return 0;
723 }
724
725 /*
726 * Returns the record size for the special blocks of the cdl format.
727 * Only returns something useful if dasd_eckd_cdl_special is true
728 * for the recid.
729 */
730 static inline int
dasd_eckd_cdl_reclen(int recid)731 dasd_eckd_cdl_reclen(int recid)
732 {
733 if (recid < 3)
734 return sizes_trk0[recid];
735 return LABEL_SIZE;
736 }
737 /* create unique id from private structure. */
create_uid(struct dasd_eckd_private * private)738 static void create_uid(struct dasd_eckd_private *private)
739 {
740 int count;
741 struct dasd_uid *uid;
742
743 uid = &private->uid;
744 memset(uid, 0, sizeof(struct dasd_uid));
745 memcpy(uid->vendor, private->ned->HDA_manufacturer,
746 sizeof(uid->vendor) - 1);
747 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
748 memcpy(uid->serial, private->ned->HDA_location,
749 sizeof(uid->serial) - 1);
750 EBCASC(uid->serial, sizeof(uid->serial) - 1);
751 uid->ssid = private->gneq->subsystemID;
752 uid->real_unit_addr = private->ned->unit_addr;
753 if (private->sneq) {
754 uid->type = private->sneq->sua_flags;
755 if (uid->type == UA_BASE_PAV_ALIAS)
756 uid->base_unit_addr = private->sneq->base_unit_addr;
757 } else {
758 uid->type = UA_BASE_DEVICE;
759 }
760 if (private->vdsneq) {
761 for (count = 0; count < 16; count++) {
762 sprintf(uid->vduit+2*count, "%02x",
763 private->vdsneq->uit[count]);
764 }
765 }
766 }
767
768 /*
769 * Generate device unique id that specifies the physical device.
770 */
dasd_eckd_generate_uid(struct dasd_device * device)771 static int dasd_eckd_generate_uid(struct dasd_device *device)
772 {
773 struct dasd_eckd_private *private = device->private;
774 unsigned long flags;
775
776 if (!private)
777 return -ENODEV;
778 if (!private->ned || !private->gneq)
779 return -ENODEV;
780 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
781 create_uid(private);
782 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
783 return 0;
784 }
785
dasd_eckd_get_uid(struct dasd_device * device,struct dasd_uid * uid)786 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
787 {
788 struct dasd_eckd_private *private = device->private;
789 unsigned long flags;
790
791 if (private) {
792 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
793 *uid = private->uid;
794 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
795 return 0;
796 }
797 return -EINVAL;
798 }
799
800 /*
801 * compare device UID with data of a given dasd_eckd_private structure
802 * return 0 for match
803 */
dasd_eckd_compare_path_uid(struct dasd_device * device,struct dasd_eckd_private * private)804 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
805 struct dasd_eckd_private *private)
806 {
807 struct dasd_uid device_uid;
808
809 create_uid(private);
810 dasd_eckd_get_uid(device, &device_uid);
811
812 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
813 }
814
dasd_eckd_fill_rcd_cqr(struct dasd_device * device,struct dasd_ccw_req * cqr,__u8 * rcd_buffer,__u8 lpm)815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
816 struct dasd_ccw_req *cqr,
817 __u8 *rcd_buffer,
818 __u8 lpm)
819 {
820 struct ccw1 *ccw;
821 /*
822 * buffer has to start with EBCDIC "V1.0" to show
823 * support for virtual device SNEQ
824 */
825 rcd_buffer[0] = 0xE5;
826 rcd_buffer[1] = 0xF1;
827 rcd_buffer[2] = 0x4B;
828 rcd_buffer[3] = 0xF0;
829
830 ccw = cqr->cpaddr;
831 ccw->cmd_code = DASD_ECKD_CCW_RCD;
832 ccw->flags = 0;
833 ccw->cda = (__u32)(addr_t)rcd_buffer;
834 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
835 cqr->magic = DASD_ECKD_MAGIC;
836
837 cqr->startdev = device;
838 cqr->memdev = device;
839 cqr->block = NULL;
840 cqr->expires = 10*HZ;
841 cqr->lpm = lpm;
842 cqr->retries = 256;
843 cqr->buildclk = get_tod_clock();
844 cqr->status = DASD_CQR_FILLED;
845 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
846 }
847
848 /*
849 * Wakeup helper for read_conf
850 * if the cqr is not done and needs some error recovery
851 * the buffer has to be re-initialized with the EBCDIC "V1.0"
852 * to show support for virtual device SNEQ
853 */
read_conf_cb(struct dasd_ccw_req * cqr,void * data)854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
855 {
856 struct ccw1 *ccw;
857 __u8 *rcd_buffer;
858
859 if (cqr->status != DASD_CQR_DONE) {
860 ccw = cqr->cpaddr;
861 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
862 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
863
864 rcd_buffer[0] = 0xE5;
865 rcd_buffer[1] = 0xF1;
866 rcd_buffer[2] = 0x4B;
867 rcd_buffer[3] = 0xF0;
868 }
869 dasd_wakeup_cb(cqr, data);
870 }
871
dasd_eckd_read_conf_immediately(struct dasd_device * device,struct dasd_ccw_req * cqr,__u8 * rcd_buffer,__u8 lpm)872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
873 struct dasd_ccw_req *cqr,
874 __u8 *rcd_buffer,
875 __u8 lpm)
876 {
877 struct ciw *ciw;
878 int rc;
879 /*
880 * sanity check: scan for RCD command in extended SenseID data
881 * some devices do not support RCD
882 */
883 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
884 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
885 return -EOPNOTSUPP;
886
887 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
888 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
889 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
890 cqr->retries = 5;
891 cqr->callback = read_conf_cb;
892 rc = dasd_sleep_on_immediatly(cqr);
893 return rc;
894 }
895
dasd_eckd_read_conf_lpm(struct dasd_device * device,void ** rcd_buffer,int * rcd_buffer_size,__u8 lpm)896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
897 void **rcd_buffer,
898 int *rcd_buffer_size, __u8 lpm)
899 {
900 struct ciw *ciw;
901 char *rcd_buf = NULL;
902 int ret;
903 struct dasd_ccw_req *cqr;
904
905 /*
906 * sanity check: scan for RCD command in extended SenseID data
907 * some devices do not support RCD
908 */
909 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
910 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
911 ret = -EOPNOTSUPP;
912 goto out_error;
913 }
914 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
915 if (!rcd_buf) {
916 ret = -ENOMEM;
917 goto out_error;
918 }
919 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
920 0, /* use rcd_buf as data ara */
921 device, NULL);
922 if (IS_ERR(cqr)) {
923 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
924 "Could not allocate RCD request");
925 ret = -ENOMEM;
926 goto out_error;
927 }
928 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
929 cqr->callback = read_conf_cb;
930 ret = dasd_sleep_on(cqr);
931 /*
932 * on success we update the user input parms
933 */
934 dasd_sfree_request(cqr, cqr->memdev);
935 if (ret)
936 goto out_error;
937
938 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
939 *rcd_buffer = rcd_buf;
940 return 0;
941 out_error:
942 kfree(rcd_buf);
943 *rcd_buffer = NULL;
944 *rcd_buffer_size = 0;
945 return ret;
946 }
947
dasd_eckd_identify_conf_parts(struct dasd_eckd_private * private)948 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
949 {
950
951 struct dasd_sneq *sneq;
952 int i, count;
953
954 private->ned = NULL;
955 private->sneq = NULL;
956 private->vdsneq = NULL;
957 private->gneq = NULL;
958 count = private->conf_len / sizeof(struct dasd_sneq);
959 sneq = (struct dasd_sneq *)private->conf_data;
960 for (i = 0; i < count; ++i) {
961 if (sneq->flags.identifier == 1 && sneq->format == 1)
962 private->sneq = sneq;
963 else if (sneq->flags.identifier == 1 && sneq->format == 4)
964 private->vdsneq = (struct vd_sneq *)sneq;
965 else if (sneq->flags.identifier == 2)
966 private->gneq = (struct dasd_gneq *)sneq;
967 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
968 private->ned = (struct dasd_ned *)sneq;
969 sneq++;
970 }
971 if (!private->ned || !private->gneq) {
972 private->ned = NULL;
973 private->sneq = NULL;
974 private->vdsneq = NULL;
975 private->gneq = NULL;
976 return -EINVAL;
977 }
978 return 0;
979
980 };
981
dasd_eckd_path_access(void * conf_data,int conf_len)982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
983 {
984 struct dasd_gneq *gneq;
985 int i, count, found;
986
987 count = conf_len / sizeof(*gneq);
988 gneq = (struct dasd_gneq *)conf_data;
989 found = 0;
990 for (i = 0; i < count; ++i) {
991 if (gneq->flags.identifier == 2) {
992 found = 1;
993 break;
994 }
995 gneq++;
996 }
997 if (found)
998 return ((char *)gneq)[18] & 0x07;
999 else
1000 return 0;
1001 }
1002
dasd_eckd_clear_conf_data(struct dasd_device * device)1003 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1004 {
1005 struct dasd_eckd_private *private = device->private;
1006 int i;
1007
1008 private->conf_data = NULL;
1009 private->conf_len = 0;
1010 for (i = 0; i < 8; i++) {
1011 kfree(device->path[i].conf_data);
1012 device->path[i].conf_data = NULL;
1013 device->path[i].cssid = 0;
1014 device->path[i].ssid = 0;
1015 device->path[i].chpid = 0;
1016 }
1017 }
1018
1019
dasd_eckd_read_conf(struct dasd_device * device)1020 static int dasd_eckd_read_conf(struct dasd_device *device)
1021 {
1022 void *conf_data;
1023 int conf_len, conf_data_saved;
1024 int rc, path_err, pos;
1025 __u8 lpm, opm;
1026 struct dasd_eckd_private *private, path_private;
1027 struct dasd_uid *uid;
1028 char print_path_uid[60], print_device_uid[60];
1029 struct channel_path_desc_fmt0 *chp_desc;
1030 struct subchannel_id sch_id;
1031
1032 private = device->private;
1033 opm = ccw_device_get_path_mask(device->cdev);
1034 ccw_device_get_schid(device->cdev, &sch_id);
1035 conf_data_saved = 0;
1036 path_err = 0;
1037 /* get configuration data per operational path */
1038 for (lpm = 0x80; lpm; lpm>>= 1) {
1039 if (!(lpm & opm))
1040 continue;
1041 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1042 &conf_len, lpm);
1043 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1044 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1045 "Read configuration data returned "
1046 "error %d", rc);
1047 return rc;
1048 }
1049 if (conf_data == NULL) {
1050 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1051 "No configuration data "
1052 "retrieved");
1053 /* no further analysis possible */
1054 dasd_path_add_opm(device, opm);
1055 continue; /* no error */
1056 }
1057 /* save first valid configuration data */
1058 if (!conf_data_saved) {
1059 /* initially clear previously stored conf_data */
1060 dasd_eckd_clear_conf_data(device);
1061 private->conf_data = conf_data;
1062 private->conf_len = conf_len;
1063 if (dasd_eckd_identify_conf_parts(private)) {
1064 private->conf_data = NULL;
1065 private->conf_len = 0;
1066 kfree(conf_data);
1067 continue;
1068 }
1069 pos = pathmask_to_pos(lpm);
1070 /* store per path conf_data */
1071 device->path[pos].conf_data = conf_data;
1072 device->path[pos].cssid = sch_id.cssid;
1073 device->path[pos].ssid = sch_id.ssid;
1074 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1075 if (chp_desc)
1076 device->path[pos].chpid = chp_desc->chpid;
1077 kfree(chp_desc);
1078 /*
1079 * build device UID that other path data
1080 * can be compared to it
1081 */
1082 dasd_eckd_generate_uid(device);
1083 conf_data_saved++;
1084 } else {
1085 path_private.conf_data = conf_data;
1086 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1087 if (dasd_eckd_identify_conf_parts(
1088 &path_private)) {
1089 path_private.conf_data = NULL;
1090 path_private.conf_len = 0;
1091 kfree(conf_data);
1092 continue;
1093 }
1094 if (dasd_eckd_compare_path_uid(
1095 device, &path_private)) {
1096 uid = &path_private.uid;
1097 if (strlen(uid->vduit) > 0)
1098 snprintf(print_path_uid,
1099 sizeof(print_path_uid),
1100 "%s.%s.%04x.%02x.%s",
1101 uid->vendor, uid->serial,
1102 uid->ssid, uid->real_unit_addr,
1103 uid->vduit);
1104 else
1105 snprintf(print_path_uid,
1106 sizeof(print_path_uid),
1107 "%s.%s.%04x.%02x",
1108 uid->vendor, uid->serial,
1109 uid->ssid,
1110 uid->real_unit_addr);
1111 uid = &private->uid;
1112 if (strlen(uid->vduit) > 0)
1113 snprintf(print_device_uid,
1114 sizeof(print_device_uid),
1115 "%s.%s.%04x.%02x.%s",
1116 uid->vendor, uid->serial,
1117 uid->ssid, uid->real_unit_addr,
1118 uid->vduit);
1119 else
1120 snprintf(print_device_uid,
1121 sizeof(print_device_uid),
1122 "%s.%s.%04x.%02x",
1123 uid->vendor, uid->serial,
1124 uid->ssid,
1125 uid->real_unit_addr);
1126 dev_err(&device->cdev->dev,
1127 "Not all channel paths lead to "
1128 "the same device, path %02X leads to "
1129 "device %s instead of %s\n", lpm,
1130 print_path_uid, print_device_uid);
1131 path_err = -EINVAL;
1132 dasd_path_add_cablepm(device, lpm);
1133 continue;
1134 }
1135 pos = pathmask_to_pos(lpm);
1136 /* store per path conf_data */
1137 device->path[pos].conf_data = conf_data;
1138 device->path[pos].cssid = sch_id.cssid;
1139 device->path[pos].ssid = sch_id.ssid;
1140 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1141 if (chp_desc)
1142 device->path[pos].chpid = chp_desc->chpid;
1143 kfree(chp_desc);
1144 path_private.conf_data = NULL;
1145 path_private.conf_len = 0;
1146 }
1147 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1148 case 0x02:
1149 dasd_path_add_nppm(device, lpm);
1150 break;
1151 case 0x03:
1152 dasd_path_add_ppm(device, lpm);
1153 break;
1154 }
1155 if (!dasd_path_get_opm(device)) {
1156 dasd_path_set_opm(device, lpm);
1157 dasd_generic_path_operational(device);
1158 } else {
1159 dasd_path_add_opm(device, lpm);
1160 }
1161 }
1162
1163 return path_err;
1164 }
1165
get_fcx_max_data(struct dasd_device * device)1166 static u32 get_fcx_max_data(struct dasd_device *device)
1167 {
1168 struct dasd_eckd_private *private = device->private;
1169 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1170 unsigned int mdc;
1171 int tpm;
1172
1173 if (dasd_nofcx)
1174 return 0;
1175 /* is transport mode supported? */
1176 fcx_in_css = css_general_characteristics.fcx;
1177 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1178 fcx_in_features = private->features.feature[40] & 0x80;
1179 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1180
1181 if (!tpm)
1182 return 0;
1183
1184 mdc = ccw_device_get_mdc(device->cdev, 0);
1185 if (mdc == 0) {
1186 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1187 return 0;
1188 } else {
1189 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1190 }
1191 }
1192
verify_fcx_max_data(struct dasd_device * device,__u8 lpm)1193 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1194 {
1195 struct dasd_eckd_private *private = device->private;
1196 unsigned int mdc;
1197 u32 fcx_max_data;
1198
1199 if (private->fcx_max_data) {
1200 mdc = ccw_device_get_mdc(device->cdev, lpm);
1201 if (mdc == 0) {
1202 dev_warn(&device->cdev->dev,
1203 "Detecting the maximum data size for zHPF "
1204 "requests failed (rc=%d) for a new path %x\n",
1205 mdc, lpm);
1206 return mdc;
1207 }
1208 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1209 if (fcx_max_data < private->fcx_max_data) {
1210 dev_warn(&device->cdev->dev,
1211 "The maximum data size for zHPF requests %u "
1212 "on a new path %x is below the active maximum "
1213 "%u\n", fcx_max_data, lpm,
1214 private->fcx_max_data);
1215 return -EACCES;
1216 }
1217 }
1218 return 0;
1219 }
1220
rebuild_device_uid(struct dasd_device * device,struct pe_handler_work_data * data)1221 static int rebuild_device_uid(struct dasd_device *device,
1222 struct pe_handler_work_data *data)
1223 {
1224 struct dasd_eckd_private *private = device->private;
1225 __u8 lpm, opm = dasd_path_get_opm(device);
1226 int rc = -ENODEV;
1227
1228 for (lpm = 0x80; lpm; lpm >>= 1) {
1229 if (!(lpm & opm))
1230 continue;
1231 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1232 memset(&data->cqr, 0, sizeof(data->cqr));
1233 data->cqr.cpaddr = &data->ccw;
1234 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1235 data->rcd_buffer,
1236 lpm);
1237
1238 if (rc) {
1239 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1240 continue;
1241 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1242 "Read configuration data "
1243 "returned error %d", rc);
1244 break;
1245 }
1246 memcpy(private->conf_data, data->rcd_buffer,
1247 DASD_ECKD_RCD_DATA_SIZE);
1248 if (dasd_eckd_identify_conf_parts(private)) {
1249 rc = -ENODEV;
1250 } else /* first valid path is enough */
1251 break;
1252 }
1253
1254 if (!rc)
1255 rc = dasd_eckd_generate_uid(device);
1256
1257 return rc;
1258 }
1259
dasd_eckd_path_available_action(struct dasd_device * device,struct pe_handler_work_data * data)1260 static void dasd_eckd_path_available_action(struct dasd_device *device,
1261 struct pe_handler_work_data *data)
1262 {
1263 struct dasd_eckd_private path_private;
1264 struct dasd_uid *uid;
1265 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1266 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1267 unsigned long flags;
1268 char print_uid[60];
1269 int rc;
1270
1271 opm = 0;
1272 npm = 0;
1273 ppm = 0;
1274 epm = 0;
1275 hpfpm = 0;
1276 cablepm = 0;
1277
1278 for (lpm = 0x80; lpm; lpm >>= 1) {
1279 if (!(lpm & data->tbvpm))
1280 continue;
1281 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1282 memset(&data->cqr, 0, sizeof(data->cqr));
1283 data->cqr.cpaddr = &data->ccw;
1284 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1285 data->rcd_buffer,
1286 lpm);
1287 if (!rc) {
1288 switch (dasd_eckd_path_access(data->rcd_buffer,
1289 DASD_ECKD_RCD_DATA_SIZE)
1290 ) {
1291 case 0x02:
1292 npm |= lpm;
1293 break;
1294 case 0x03:
1295 ppm |= lpm;
1296 break;
1297 }
1298 opm |= lpm;
1299 } else if (rc == -EOPNOTSUPP) {
1300 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1301 "path verification: No configuration "
1302 "data retrieved");
1303 opm |= lpm;
1304 } else if (rc == -EAGAIN) {
1305 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1306 "path verification: device is stopped,"
1307 " try again later");
1308 epm |= lpm;
1309 } else {
1310 dev_warn(&device->cdev->dev,
1311 "Reading device feature codes failed "
1312 "(rc=%d) for new path %x\n", rc, lpm);
1313 continue;
1314 }
1315 if (verify_fcx_max_data(device, lpm)) {
1316 opm &= ~lpm;
1317 npm &= ~lpm;
1318 ppm &= ~lpm;
1319 hpfpm |= lpm;
1320 continue;
1321 }
1322
1323 /*
1324 * save conf_data for comparison after
1325 * rebuild_device_uid may have changed
1326 * the original data
1327 */
1328 memcpy(&path_rcd_buf, data->rcd_buffer,
1329 DASD_ECKD_RCD_DATA_SIZE);
1330 path_private.conf_data = (void *) &path_rcd_buf;
1331 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1332 if (dasd_eckd_identify_conf_parts(&path_private)) {
1333 path_private.conf_data = NULL;
1334 path_private.conf_len = 0;
1335 continue;
1336 }
1337
1338 /*
1339 * compare path UID with device UID only if at least
1340 * one valid path is left
1341 * in other case the device UID may have changed and
1342 * the first working path UID will be used as device UID
1343 */
1344 if (dasd_path_get_opm(device) &&
1345 dasd_eckd_compare_path_uid(device, &path_private)) {
1346 /*
1347 * the comparison was not successful
1348 * rebuild the device UID with at least one
1349 * known path in case a z/VM hyperswap command
1350 * has changed the device
1351 *
1352 * after this compare again
1353 *
1354 * if either the rebuild or the recompare fails
1355 * the path can not be used
1356 */
1357 if (rebuild_device_uid(device, data) ||
1358 dasd_eckd_compare_path_uid(
1359 device, &path_private)) {
1360 uid = &path_private.uid;
1361 if (strlen(uid->vduit) > 0)
1362 snprintf(print_uid, sizeof(print_uid),
1363 "%s.%s.%04x.%02x.%s",
1364 uid->vendor, uid->serial,
1365 uid->ssid, uid->real_unit_addr,
1366 uid->vduit);
1367 else
1368 snprintf(print_uid, sizeof(print_uid),
1369 "%s.%s.%04x.%02x",
1370 uid->vendor, uid->serial,
1371 uid->ssid,
1372 uid->real_unit_addr);
1373 dev_err(&device->cdev->dev,
1374 "The newly added channel path %02X "
1375 "will not be used because it leads "
1376 "to a different device %s\n",
1377 lpm, print_uid);
1378 opm &= ~lpm;
1379 npm &= ~lpm;
1380 ppm &= ~lpm;
1381 cablepm |= lpm;
1382 continue;
1383 }
1384 }
1385
1386 /*
1387 * There is a small chance that a path is lost again between
1388 * above path verification and the following modification of
1389 * the device opm mask. We could avoid that race here by using
1390 * yet another path mask, but we rather deal with this unlikely
1391 * situation in dasd_start_IO.
1392 */
1393 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1394 if (!dasd_path_get_opm(device) && opm) {
1395 dasd_path_set_opm(device, opm);
1396 dasd_generic_path_operational(device);
1397 } else {
1398 dasd_path_add_opm(device, opm);
1399 }
1400 dasd_path_add_nppm(device, npm);
1401 dasd_path_add_ppm(device, ppm);
1402 dasd_path_add_tbvpm(device, epm);
1403 dasd_path_add_cablepm(device, cablepm);
1404 dasd_path_add_nohpfpm(device, hpfpm);
1405 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1406 }
1407 }
1408
do_pe_handler_work(struct work_struct * work)1409 static void do_pe_handler_work(struct work_struct *work)
1410 {
1411 struct pe_handler_work_data *data;
1412 struct dasd_device *device;
1413
1414 data = container_of(work, struct pe_handler_work_data, worker);
1415 device = data->device;
1416
1417 /* delay path verification until device was resumed */
1418 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1419 schedule_work(work);
1420 return;
1421 }
1422 /* check if path verification already running and delay if so */
1423 if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1424 schedule_work(work);
1425 return;
1426 }
1427
1428 dasd_eckd_path_available_action(device, data);
1429
1430 clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1431 dasd_put_device(device);
1432 if (data->isglobal)
1433 mutex_unlock(&dasd_pe_handler_mutex);
1434 else
1435 kfree(data);
1436 }
1437
dasd_eckd_pe_handler(struct dasd_device * device,__u8 lpm)1438 static int dasd_eckd_pe_handler(struct dasd_device *device, __u8 lpm)
1439 {
1440 struct pe_handler_work_data *data;
1441
1442 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1443 if (!data) {
1444 if (mutex_trylock(&dasd_pe_handler_mutex)) {
1445 data = pe_handler_worker;
1446 data->isglobal = 1;
1447 } else {
1448 return -ENOMEM;
1449 }
1450 } else {
1451 memset(data, 0, sizeof(*data));
1452 data->isglobal = 0;
1453 }
1454 INIT_WORK(&data->worker, do_pe_handler_work);
1455 dasd_get_device(device);
1456 data->device = device;
1457 data->tbvpm = lpm;
1458 schedule_work(&data->worker);
1459 return 0;
1460 }
1461
dasd_eckd_reset_path(struct dasd_device * device,__u8 pm)1462 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1463 {
1464 struct dasd_eckd_private *private = device->private;
1465 unsigned long flags;
1466
1467 if (!private->fcx_max_data)
1468 private->fcx_max_data = get_fcx_max_data(device);
1469 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1470 dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1471 dasd_schedule_device_bh(device);
1472 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1473 }
1474
dasd_eckd_read_features(struct dasd_device * device)1475 static int dasd_eckd_read_features(struct dasd_device *device)
1476 {
1477 struct dasd_eckd_private *private = device->private;
1478 struct dasd_psf_prssd_data *prssdp;
1479 struct dasd_rssd_features *features;
1480 struct dasd_ccw_req *cqr;
1481 struct ccw1 *ccw;
1482 int rc;
1483
1484 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1485 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1486 (sizeof(struct dasd_psf_prssd_data) +
1487 sizeof(struct dasd_rssd_features)),
1488 device, NULL);
1489 if (IS_ERR(cqr)) {
1490 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1491 "allocate initialization request");
1492 return PTR_ERR(cqr);
1493 }
1494 cqr->startdev = device;
1495 cqr->memdev = device;
1496 cqr->block = NULL;
1497 cqr->retries = 256;
1498 cqr->expires = 10 * HZ;
1499
1500 /* Prepare for Read Subsystem Data */
1501 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1502 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1503 prssdp->order = PSF_ORDER_PRSSD;
1504 prssdp->suborder = 0x41; /* Read Feature Codes */
1505 /* all other bytes of prssdp must be zero */
1506
1507 ccw = cqr->cpaddr;
1508 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1509 ccw->count = sizeof(struct dasd_psf_prssd_data);
1510 ccw->flags |= CCW_FLAG_CC;
1511 ccw->cda = (__u32)(addr_t) prssdp;
1512
1513 /* Read Subsystem Data - feature codes */
1514 features = (struct dasd_rssd_features *) (prssdp + 1);
1515 memset(features, 0, sizeof(struct dasd_rssd_features));
1516
1517 ccw++;
1518 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1519 ccw->count = sizeof(struct dasd_rssd_features);
1520 ccw->cda = (__u32)(addr_t) features;
1521
1522 cqr->buildclk = get_tod_clock();
1523 cqr->status = DASD_CQR_FILLED;
1524 rc = dasd_sleep_on(cqr);
1525 if (rc == 0) {
1526 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1527 features = (struct dasd_rssd_features *) (prssdp + 1);
1528 memcpy(&private->features, features,
1529 sizeof(struct dasd_rssd_features));
1530 } else
1531 dev_warn(&device->cdev->dev, "Reading device feature codes"
1532 " failed with rc=%d\n", rc);
1533 dasd_sfree_request(cqr, cqr->memdev);
1534 return rc;
1535 }
1536
1537 /* Read Volume Information - Volume Storage Query */
dasd_eckd_read_vol_info(struct dasd_device * device)1538 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1539 {
1540 struct dasd_eckd_private *private = device->private;
1541 struct dasd_psf_prssd_data *prssdp;
1542 struct dasd_rssd_vsq *vsq;
1543 struct dasd_ccw_req *cqr;
1544 struct ccw1 *ccw;
1545 int useglobal;
1546 int rc;
1547
1548 /* This command cannot be executed on an alias device */
1549 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1550 private->uid.type == UA_HYPER_PAV_ALIAS)
1551 return 0;
1552
1553 useglobal = 0;
1554 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1555 sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1556 if (IS_ERR(cqr)) {
1557 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1558 "Could not allocate initialization request");
1559 mutex_lock(&dasd_vol_info_mutex);
1560 useglobal = 1;
1561 cqr = &dasd_vol_info_req->cqr;
1562 memset(cqr, 0, sizeof(*cqr));
1563 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1564 cqr->cpaddr = &dasd_vol_info_req->ccw;
1565 cqr->data = &dasd_vol_info_req->data;
1566 cqr->magic = DASD_ECKD_MAGIC;
1567 }
1568
1569 /* Prepare for Read Subsystem Data */
1570 prssdp = cqr->data;
1571 prssdp->order = PSF_ORDER_PRSSD;
1572 prssdp->suborder = PSF_SUBORDER_VSQ; /* Volume Storage Query */
1573 prssdp->lss = private->ned->ID;
1574 prssdp->volume = private->ned->unit_addr;
1575
1576 ccw = cqr->cpaddr;
1577 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1578 ccw->count = sizeof(*prssdp);
1579 ccw->flags |= CCW_FLAG_CC;
1580 ccw->cda = (__u32)(addr_t)prssdp;
1581
1582 /* Read Subsystem Data - Volume Storage Query */
1583 vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1584 memset(vsq, 0, sizeof(*vsq));
1585
1586 ccw++;
1587 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1588 ccw->count = sizeof(*vsq);
1589 ccw->flags |= CCW_FLAG_SLI;
1590 ccw->cda = (__u32)(addr_t)vsq;
1591
1592 cqr->buildclk = get_tod_clock();
1593 cqr->status = DASD_CQR_FILLED;
1594 cqr->startdev = device;
1595 cqr->memdev = device;
1596 cqr->block = NULL;
1597 cqr->retries = 256;
1598 cqr->expires = device->default_expires * HZ;
1599 /* The command might not be supported. Suppress the error output */
1600 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1601
1602 rc = dasd_sleep_on_interruptible(cqr);
1603 if (rc == 0) {
1604 memcpy(&private->vsq, vsq, sizeof(*vsq));
1605 } else {
1606 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1607 "Reading the volume storage information failed with rc=%d", rc);
1608 }
1609
1610 if (useglobal)
1611 mutex_unlock(&dasd_vol_info_mutex);
1612 else
1613 dasd_sfree_request(cqr, cqr->memdev);
1614
1615 return rc;
1616 }
1617
dasd_eckd_is_ese(struct dasd_device * device)1618 static int dasd_eckd_is_ese(struct dasd_device *device)
1619 {
1620 struct dasd_eckd_private *private = device->private;
1621
1622 return private->vsq.vol_info.ese;
1623 }
1624
dasd_eckd_ext_pool_id(struct dasd_device * device)1625 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1626 {
1627 struct dasd_eckd_private *private = device->private;
1628
1629 return private->vsq.extent_pool_id;
1630 }
1631
1632 /*
1633 * This value represents the total amount of available space. As more space is
1634 * allocated by ESE volumes, this value will decrease.
1635 * The data for this value is therefore updated on any call.
1636 */
dasd_eckd_space_configured(struct dasd_device * device)1637 static int dasd_eckd_space_configured(struct dasd_device *device)
1638 {
1639 struct dasd_eckd_private *private = device->private;
1640 int rc;
1641
1642 rc = dasd_eckd_read_vol_info(device);
1643
1644 return rc ? : private->vsq.space_configured;
1645 }
1646
1647 /*
1648 * The value of space allocated by an ESE volume may have changed and is
1649 * therefore updated on any call.
1650 */
dasd_eckd_space_allocated(struct dasd_device * device)1651 static int dasd_eckd_space_allocated(struct dasd_device *device)
1652 {
1653 struct dasd_eckd_private *private = device->private;
1654 int rc;
1655
1656 rc = dasd_eckd_read_vol_info(device);
1657
1658 return rc ? : private->vsq.space_allocated;
1659 }
1660
dasd_eckd_logical_capacity(struct dasd_device * device)1661 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1662 {
1663 struct dasd_eckd_private *private = device->private;
1664
1665 return private->vsq.logical_capacity;
1666 }
1667
dasd_eckd_ext_pool_exhaust_work(struct work_struct * work)1668 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1669 {
1670 struct ext_pool_exhaust_work_data *data;
1671 struct dasd_device *device;
1672 struct dasd_device *base;
1673
1674 data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1675 device = data->device;
1676 base = data->base;
1677
1678 if (!base)
1679 base = device;
1680 if (dasd_eckd_space_configured(base) != 0) {
1681 dasd_generic_space_avail(device);
1682 } else {
1683 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1684 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1685 }
1686
1687 dasd_put_device(device);
1688 kfree(data);
1689 }
1690
dasd_eckd_ext_pool_exhaust(struct dasd_device * device,struct dasd_ccw_req * cqr)1691 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1692 struct dasd_ccw_req *cqr)
1693 {
1694 struct ext_pool_exhaust_work_data *data;
1695
1696 data = kzalloc(sizeof(*data), GFP_ATOMIC);
1697 if (!data)
1698 return -ENOMEM;
1699 INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1700 dasd_get_device(device);
1701 data->device = device;
1702
1703 if (cqr->block)
1704 data->base = cqr->block->base;
1705 else if (cqr->basedev)
1706 data->base = cqr->basedev;
1707 else
1708 data->base = NULL;
1709
1710 schedule_work(&data->worker);
1711
1712 return 0;
1713 }
1714
dasd_eckd_cpy_ext_pool_data(struct dasd_device * device,struct dasd_rssd_lcq * lcq)1715 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1716 struct dasd_rssd_lcq *lcq)
1717 {
1718 struct dasd_eckd_private *private = device->private;
1719 int pool_id = dasd_eckd_ext_pool_id(device);
1720 struct dasd_ext_pool_sum eps;
1721 int i;
1722
1723 for (i = 0; i < lcq->pool_count; i++) {
1724 eps = lcq->ext_pool_sum[i];
1725 if (eps.pool_id == pool_id) {
1726 memcpy(&private->eps, &eps,
1727 sizeof(struct dasd_ext_pool_sum));
1728 }
1729 }
1730 }
1731
1732 /* Read Extent Pool Information - Logical Configuration Query */
dasd_eckd_read_ext_pool_info(struct dasd_device * device)1733 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1734 {
1735 struct dasd_eckd_private *private = device->private;
1736 struct dasd_psf_prssd_data *prssdp;
1737 struct dasd_rssd_lcq *lcq;
1738 struct dasd_ccw_req *cqr;
1739 struct ccw1 *ccw;
1740 int rc;
1741
1742 /* This command cannot be executed on an alias device */
1743 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1744 private->uid.type == UA_HYPER_PAV_ALIAS)
1745 return 0;
1746
1747 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1748 sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1749 if (IS_ERR(cqr)) {
1750 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1751 "Could not allocate initialization request");
1752 return PTR_ERR(cqr);
1753 }
1754
1755 /* Prepare for Read Subsystem Data */
1756 prssdp = cqr->data;
1757 memset(prssdp, 0, sizeof(*prssdp));
1758 prssdp->order = PSF_ORDER_PRSSD;
1759 prssdp->suborder = PSF_SUBORDER_LCQ; /* Logical Configuration Query */
1760
1761 ccw = cqr->cpaddr;
1762 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1763 ccw->count = sizeof(*prssdp);
1764 ccw->flags |= CCW_FLAG_CC;
1765 ccw->cda = (__u32)(addr_t)prssdp;
1766
1767 lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1768 memset(lcq, 0, sizeof(*lcq));
1769
1770 ccw++;
1771 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1772 ccw->count = sizeof(*lcq);
1773 ccw->flags |= CCW_FLAG_SLI;
1774 ccw->cda = (__u32)(addr_t)lcq;
1775
1776 cqr->buildclk = get_tod_clock();
1777 cqr->status = DASD_CQR_FILLED;
1778 cqr->startdev = device;
1779 cqr->memdev = device;
1780 cqr->block = NULL;
1781 cqr->retries = 256;
1782 cqr->expires = device->default_expires * HZ;
1783 /* The command might not be supported. Suppress the error output */
1784 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1785
1786 rc = dasd_sleep_on_interruptible(cqr);
1787 if (rc == 0) {
1788 dasd_eckd_cpy_ext_pool_data(device, lcq);
1789 } else {
1790 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1791 "Reading the logical configuration failed with rc=%d", rc);
1792 }
1793
1794 dasd_sfree_request(cqr, cqr->memdev);
1795
1796 return rc;
1797 }
1798
1799 /*
1800 * Depending on the device type, the extent size is specified either as
1801 * cylinders per extent (CKD) or size per extent (FBA)
1802 * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1803 */
dasd_eckd_ext_size(struct dasd_device * device)1804 static int dasd_eckd_ext_size(struct dasd_device *device)
1805 {
1806 struct dasd_eckd_private *private = device->private;
1807 struct dasd_ext_pool_sum eps = private->eps;
1808
1809 if (!eps.flags.extent_size_valid)
1810 return 0;
1811 if (eps.extent_size.size_1G)
1812 return 1113;
1813 if (eps.extent_size.size_16M)
1814 return 21;
1815
1816 return 0;
1817 }
1818
dasd_eckd_ext_pool_warn_thrshld(struct dasd_device * device)1819 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1820 {
1821 struct dasd_eckd_private *private = device->private;
1822
1823 return private->eps.warn_thrshld;
1824 }
1825
dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device * device)1826 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1827 {
1828 struct dasd_eckd_private *private = device->private;
1829
1830 return private->eps.flags.capacity_at_warnlevel;
1831 }
1832
1833 /*
1834 * Extent Pool out of space
1835 */
dasd_eckd_ext_pool_oos(struct dasd_device * device)1836 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1837 {
1838 struct dasd_eckd_private *private = device->private;
1839
1840 return private->eps.flags.pool_oos;
1841 }
1842
1843 /*
1844 * Build CP for Perform Subsystem Function - SSC.
1845 */
dasd_eckd_build_psf_ssc(struct dasd_device * device,int enable_pav)1846 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1847 int enable_pav)
1848 {
1849 struct dasd_ccw_req *cqr;
1850 struct dasd_psf_ssc_data *psf_ssc_data;
1851 struct ccw1 *ccw;
1852
1853 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1854 sizeof(struct dasd_psf_ssc_data),
1855 device, NULL);
1856
1857 if (IS_ERR(cqr)) {
1858 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1859 "Could not allocate PSF-SSC request");
1860 return cqr;
1861 }
1862 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1863 psf_ssc_data->order = PSF_ORDER_SSC;
1864 psf_ssc_data->suborder = 0xc0;
1865 if (enable_pav) {
1866 psf_ssc_data->suborder |= 0x08;
1867 psf_ssc_data->reserved[0] = 0x88;
1868 }
1869 ccw = cqr->cpaddr;
1870 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1871 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1872 ccw->count = 66;
1873
1874 cqr->startdev = device;
1875 cqr->memdev = device;
1876 cqr->block = NULL;
1877 cqr->retries = 256;
1878 cqr->expires = 10*HZ;
1879 cqr->buildclk = get_tod_clock();
1880 cqr->status = DASD_CQR_FILLED;
1881 return cqr;
1882 }
1883
1884 /*
1885 * Perform Subsystem Function.
1886 * It is necessary to trigger CIO for channel revalidation since this
1887 * call might change behaviour of DASD devices.
1888 */
1889 static int
dasd_eckd_psf_ssc(struct dasd_device * device,int enable_pav,unsigned long flags)1890 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1891 unsigned long flags)
1892 {
1893 struct dasd_ccw_req *cqr;
1894 int rc;
1895
1896 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1897 if (IS_ERR(cqr))
1898 return PTR_ERR(cqr);
1899
1900 /*
1901 * set flags e.g. turn on failfast, to prevent blocking
1902 * the calling function should handle failed requests
1903 */
1904 cqr->flags |= flags;
1905
1906 rc = dasd_sleep_on(cqr);
1907 if (!rc)
1908 /* trigger CIO to reprobe devices */
1909 css_schedule_reprobe();
1910 else if (cqr->intrc == -EAGAIN)
1911 rc = -EAGAIN;
1912
1913 dasd_sfree_request(cqr, cqr->memdev);
1914 return rc;
1915 }
1916
1917 /*
1918 * Valide storage server of current device.
1919 */
dasd_eckd_validate_server(struct dasd_device * device,unsigned long flags)1920 static int dasd_eckd_validate_server(struct dasd_device *device,
1921 unsigned long flags)
1922 {
1923 struct dasd_eckd_private *private = device->private;
1924 int enable_pav, rc;
1925
1926 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1927 private->uid.type == UA_HYPER_PAV_ALIAS)
1928 return 0;
1929 if (dasd_nopav || MACHINE_IS_VM)
1930 enable_pav = 0;
1931 else
1932 enable_pav = 1;
1933 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1934
1935 /* may be requested feature is not available on server,
1936 * therefore just report error and go ahead */
1937 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1938 "returned rc=%d", private->uid.ssid, rc);
1939 return rc;
1940 }
1941
1942 /*
1943 * worker to do a validate server in case of a lost pathgroup
1944 */
dasd_eckd_do_validate_server(struct work_struct * work)1945 static void dasd_eckd_do_validate_server(struct work_struct *work)
1946 {
1947 struct dasd_device *device = container_of(work, struct dasd_device,
1948 kick_validate);
1949 unsigned long flags = 0;
1950
1951 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1952 if (dasd_eckd_validate_server(device, flags)
1953 == -EAGAIN) {
1954 /* schedule worker again if failed */
1955 schedule_work(&device->kick_validate);
1956 return;
1957 }
1958
1959 dasd_put_device(device);
1960 }
1961
dasd_eckd_kick_validate_server(struct dasd_device * device)1962 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1963 {
1964 dasd_get_device(device);
1965 /* exit if device not online or in offline processing */
1966 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1967 device->state < DASD_STATE_ONLINE) {
1968 dasd_put_device(device);
1969 return;
1970 }
1971 /* queue call to do_validate_server to the kernel event daemon. */
1972 if (!schedule_work(&device->kick_validate))
1973 dasd_put_device(device);
1974 }
1975
1976 /*
1977 * Check device characteristics.
1978 * If the device is accessible using ECKD discipline, the device is enabled.
1979 */
1980 static int
dasd_eckd_check_characteristics(struct dasd_device * device)1981 dasd_eckd_check_characteristics(struct dasd_device *device)
1982 {
1983 struct dasd_eckd_private *private = device->private;
1984 struct dasd_block *block;
1985 struct dasd_uid temp_uid;
1986 int rc, i;
1987 int readonly;
1988 unsigned long value;
1989
1990 /* setup work queue for validate server*/
1991 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1992 /* setup work queue for summary unit check */
1993 INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1994
1995 if (!ccw_device_is_pathgroup(device->cdev)) {
1996 dev_warn(&device->cdev->dev,
1997 "A channel path group could not be established\n");
1998 return -EIO;
1999 }
2000 if (!ccw_device_is_multipath(device->cdev)) {
2001 dev_info(&device->cdev->dev,
2002 "The DASD is not operating in multipath mode\n");
2003 }
2004 if (!private) {
2005 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2006 if (!private) {
2007 dev_warn(&device->cdev->dev,
2008 "Allocating memory for private DASD data "
2009 "failed\n");
2010 return -ENOMEM;
2011 }
2012 device->private = private;
2013 } else {
2014 memset(private, 0, sizeof(*private));
2015 }
2016 /* Invalidate status of initial analysis. */
2017 private->init_cqr_status = -1;
2018 /* Set default cache operations. */
2019 private->attrib.operation = DASD_NORMAL_CACHE;
2020 private->attrib.nr_cyl = 0;
2021
2022 /* Read Configuration Data */
2023 rc = dasd_eckd_read_conf(device);
2024 if (rc)
2025 goto out_err1;
2026
2027 /* set some default values */
2028 device->default_expires = DASD_EXPIRES;
2029 device->default_retries = DASD_RETRIES;
2030 device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2031 device->path_interval = DASD_ECKD_PATH_INTERVAL;
2032
2033 if (private->gneq) {
2034 value = 1;
2035 for (i = 0; i < private->gneq->timeout.value; i++)
2036 value = 10 * value;
2037 value = value * private->gneq->timeout.number;
2038 /* do not accept useless values */
2039 if (value != 0 && value <= DASD_EXPIRES_MAX)
2040 device->default_expires = value;
2041 }
2042
2043 dasd_eckd_get_uid(device, &temp_uid);
2044 if (temp_uid.type == UA_BASE_DEVICE) {
2045 block = dasd_alloc_block();
2046 if (IS_ERR(block)) {
2047 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2048 "could not allocate dasd "
2049 "block structure");
2050 rc = PTR_ERR(block);
2051 goto out_err1;
2052 }
2053 device->block = block;
2054 block->base = device;
2055 }
2056
2057 /* register lcu with alias handling, enable PAV */
2058 rc = dasd_alias_make_device_known_to_lcu(device);
2059 if (rc)
2060 goto out_err2;
2061
2062 dasd_eckd_validate_server(device, 0);
2063
2064 /* device may report different configuration data after LCU setup */
2065 rc = dasd_eckd_read_conf(device);
2066 if (rc)
2067 goto out_err3;
2068
2069 /* Read Feature Codes */
2070 dasd_eckd_read_features(device);
2071
2072 /* Read Volume Information */
2073 dasd_eckd_read_vol_info(device);
2074
2075 /* Read Extent Pool Information */
2076 dasd_eckd_read_ext_pool_info(device);
2077
2078 /* Read Device Characteristics */
2079 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2080 &private->rdc_data, 64);
2081 if (rc) {
2082 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2083 "Read device characteristic failed, rc=%d", rc);
2084 goto out_err3;
2085 }
2086
2087 if ((device->features & DASD_FEATURE_USERAW) &&
2088 !(private->rdc_data.facilities.RT_in_LR)) {
2089 dev_err(&device->cdev->dev, "The storage server does not "
2090 "support raw-track access\n");
2091 rc = -EINVAL;
2092 goto out_err3;
2093 }
2094
2095 /* find the valid cylinder size */
2096 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2097 private->rdc_data.long_no_cyl)
2098 private->real_cyl = private->rdc_data.long_no_cyl;
2099 else
2100 private->real_cyl = private->rdc_data.no_cyl;
2101
2102 private->fcx_max_data = get_fcx_max_data(device);
2103
2104 readonly = dasd_device_is_ro(device);
2105 if (readonly)
2106 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2107
2108 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2109 "with %d cylinders, %d heads, %d sectors%s\n",
2110 private->rdc_data.dev_type,
2111 private->rdc_data.dev_model,
2112 private->rdc_data.cu_type,
2113 private->rdc_data.cu_model.model,
2114 private->real_cyl,
2115 private->rdc_data.trk_per_cyl,
2116 private->rdc_data.sec_per_trk,
2117 readonly ? ", read-only device" : "");
2118 return 0;
2119
2120 out_err3:
2121 dasd_alias_disconnect_device_from_lcu(device);
2122 out_err2:
2123 dasd_free_block(device->block);
2124 device->block = NULL;
2125 out_err1:
2126 dasd_eckd_clear_conf_data(device);
2127 kfree(device->private);
2128 device->private = NULL;
2129 return rc;
2130 }
2131
dasd_eckd_uncheck_device(struct dasd_device * device)2132 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2133 {
2134 struct dasd_eckd_private *private = device->private;
2135
2136 if (!private)
2137 return;
2138
2139 dasd_alias_disconnect_device_from_lcu(device);
2140 private->ned = NULL;
2141 private->sneq = NULL;
2142 private->vdsneq = NULL;
2143 private->gneq = NULL;
2144 dasd_eckd_clear_conf_data(device);
2145 }
2146
2147 static struct dasd_ccw_req *
dasd_eckd_analysis_ccw(struct dasd_device * device)2148 dasd_eckd_analysis_ccw(struct dasd_device *device)
2149 {
2150 struct dasd_eckd_private *private = device->private;
2151 struct eckd_count *count_data;
2152 struct LO_eckd_data *LO_data;
2153 struct dasd_ccw_req *cqr;
2154 struct ccw1 *ccw;
2155 int cplength, datasize;
2156 int i;
2157
2158 cplength = 8;
2159 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2160 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2161 NULL);
2162 if (IS_ERR(cqr))
2163 return cqr;
2164 ccw = cqr->cpaddr;
2165 /* Define extent for the first 2 tracks. */
2166 define_extent(ccw++, cqr->data, 0, 1,
2167 DASD_ECKD_CCW_READ_COUNT, device, 0);
2168 LO_data = cqr->data + sizeof(struct DE_eckd_data);
2169 /* Locate record for the first 4 records on track 0. */
2170 ccw[-1].flags |= CCW_FLAG_CC;
2171 locate_record(ccw++, LO_data++, 0, 0, 4,
2172 DASD_ECKD_CCW_READ_COUNT, device, 0);
2173
2174 count_data = private->count_area;
2175 for (i = 0; i < 4; i++) {
2176 ccw[-1].flags |= CCW_FLAG_CC;
2177 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2178 ccw->flags = 0;
2179 ccw->count = 8;
2180 ccw->cda = (__u32)(addr_t) count_data;
2181 ccw++;
2182 count_data++;
2183 }
2184
2185 /* Locate record for the first record on track 1. */
2186 ccw[-1].flags |= CCW_FLAG_CC;
2187 locate_record(ccw++, LO_data++, 1, 0, 1,
2188 DASD_ECKD_CCW_READ_COUNT, device, 0);
2189 /* Read count ccw. */
2190 ccw[-1].flags |= CCW_FLAG_CC;
2191 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2192 ccw->flags = 0;
2193 ccw->count = 8;
2194 ccw->cda = (__u32)(addr_t) count_data;
2195
2196 cqr->block = NULL;
2197 cqr->startdev = device;
2198 cqr->memdev = device;
2199 cqr->retries = 255;
2200 cqr->buildclk = get_tod_clock();
2201 cqr->status = DASD_CQR_FILLED;
2202 /* Set flags to suppress output for expected errors */
2203 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2204
2205 return cqr;
2206 }
2207
2208 /* differentiate between 'no record found' and any other error */
dasd_eckd_analysis_evaluation(struct dasd_ccw_req * init_cqr)2209 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2210 {
2211 char *sense;
2212 if (init_cqr->status == DASD_CQR_DONE)
2213 return INIT_CQR_OK;
2214 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2215 init_cqr->status == DASD_CQR_FAILED) {
2216 sense = dasd_get_sense(&init_cqr->irb);
2217 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2218 return INIT_CQR_UNFORMATTED;
2219 else
2220 return INIT_CQR_ERROR;
2221 } else
2222 return INIT_CQR_ERROR;
2223 }
2224
2225 /*
2226 * This is the callback function for the init_analysis cqr. It saves
2227 * the status of the initial analysis ccw before it frees it and kicks
2228 * the device to continue the startup sequence. This will call
2229 * dasd_eckd_do_analysis again (if the devices has not been marked
2230 * for deletion in the meantime).
2231 */
dasd_eckd_analysis_callback(struct dasd_ccw_req * init_cqr,void * data)2232 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2233 void *data)
2234 {
2235 struct dasd_device *device = init_cqr->startdev;
2236 struct dasd_eckd_private *private = device->private;
2237
2238 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2239 dasd_sfree_request(init_cqr, device);
2240 dasd_kick_device(device);
2241 }
2242
dasd_eckd_start_analysis(struct dasd_block * block)2243 static int dasd_eckd_start_analysis(struct dasd_block *block)
2244 {
2245 struct dasd_ccw_req *init_cqr;
2246
2247 init_cqr = dasd_eckd_analysis_ccw(block->base);
2248 if (IS_ERR(init_cqr))
2249 return PTR_ERR(init_cqr);
2250 init_cqr->callback = dasd_eckd_analysis_callback;
2251 init_cqr->callback_data = NULL;
2252 init_cqr->expires = 5*HZ;
2253 /* first try without ERP, so we can later handle unformatted
2254 * devices as special case
2255 */
2256 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2257 init_cqr->retries = 0;
2258 dasd_add_request_head(init_cqr);
2259 return -EAGAIN;
2260 }
2261
dasd_eckd_end_analysis(struct dasd_block * block)2262 static int dasd_eckd_end_analysis(struct dasd_block *block)
2263 {
2264 struct dasd_device *device = block->base;
2265 struct dasd_eckd_private *private = device->private;
2266 struct eckd_count *count_area;
2267 unsigned int sb, blk_per_trk;
2268 int status, i;
2269 struct dasd_ccw_req *init_cqr;
2270
2271 status = private->init_cqr_status;
2272 private->init_cqr_status = -1;
2273 if (status == INIT_CQR_ERROR) {
2274 /* try again, this time with full ERP */
2275 init_cqr = dasd_eckd_analysis_ccw(device);
2276 dasd_sleep_on(init_cqr);
2277 status = dasd_eckd_analysis_evaluation(init_cqr);
2278 dasd_sfree_request(init_cqr, device);
2279 }
2280
2281 if (device->features & DASD_FEATURE_USERAW) {
2282 block->bp_block = DASD_RAW_BLOCKSIZE;
2283 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2284 block->s2b_shift = 3;
2285 goto raw;
2286 }
2287
2288 if (status == INIT_CQR_UNFORMATTED) {
2289 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2290 return -EMEDIUMTYPE;
2291 } else if (status == INIT_CQR_ERROR) {
2292 dev_err(&device->cdev->dev,
2293 "Detecting the DASD disk layout failed because "
2294 "of an I/O error\n");
2295 return -EIO;
2296 }
2297
2298 private->uses_cdl = 1;
2299 /* Check Track 0 for Compatible Disk Layout */
2300 count_area = NULL;
2301 for (i = 0; i < 3; i++) {
2302 if (private->count_area[i].kl != 4 ||
2303 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2304 private->count_area[i].cyl != 0 ||
2305 private->count_area[i].head != count_area_head[i] ||
2306 private->count_area[i].record != count_area_rec[i]) {
2307 private->uses_cdl = 0;
2308 break;
2309 }
2310 }
2311 if (i == 3)
2312 count_area = &private->count_area[3];
2313
2314 if (private->uses_cdl == 0) {
2315 for (i = 0; i < 5; i++) {
2316 if ((private->count_area[i].kl != 0) ||
2317 (private->count_area[i].dl !=
2318 private->count_area[0].dl) ||
2319 private->count_area[i].cyl != 0 ||
2320 private->count_area[i].head != count_area_head[i] ||
2321 private->count_area[i].record != count_area_rec[i])
2322 break;
2323 }
2324 if (i == 5)
2325 count_area = &private->count_area[0];
2326 } else {
2327 if (private->count_area[3].record == 1)
2328 dev_warn(&device->cdev->dev,
2329 "Track 0 has no records following the VTOC\n");
2330 }
2331
2332 if (count_area != NULL && count_area->kl == 0) {
2333 /* we found notthing violating our disk layout */
2334 if (dasd_check_blocksize(count_area->dl) == 0)
2335 block->bp_block = count_area->dl;
2336 }
2337 if (block->bp_block == 0) {
2338 dev_warn(&device->cdev->dev,
2339 "The disk layout of the DASD is not supported\n");
2340 return -EMEDIUMTYPE;
2341 }
2342 block->s2b_shift = 0; /* bits to shift 512 to get a block */
2343 for (sb = 512; sb < block->bp_block; sb = sb << 1)
2344 block->s2b_shift++;
2345
2346 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2347
2348 raw:
2349 block->blocks = ((unsigned long) private->real_cyl *
2350 private->rdc_data.trk_per_cyl *
2351 blk_per_trk);
2352
2353 dev_info(&device->cdev->dev,
2354 "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2355 "%s\n", (block->bp_block >> 10),
2356 (((unsigned long) private->real_cyl *
2357 private->rdc_data.trk_per_cyl *
2358 blk_per_trk * (block->bp_block >> 9)) >> 1),
2359 ((blk_per_trk * block->bp_block) >> 10),
2360 private->uses_cdl ?
2361 "compatible disk layout" : "linux disk layout");
2362
2363 return 0;
2364 }
2365
dasd_eckd_do_analysis(struct dasd_block * block)2366 static int dasd_eckd_do_analysis(struct dasd_block *block)
2367 {
2368 struct dasd_eckd_private *private = block->base->private;
2369
2370 if (private->init_cqr_status < 0)
2371 return dasd_eckd_start_analysis(block);
2372 else
2373 return dasd_eckd_end_analysis(block);
2374 }
2375
dasd_eckd_basic_to_ready(struct dasd_device * device)2376 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2377 {
2378 return dasd_alias_add_device(device);
2379 };
2380
dasd_eckd_online_to_ready(struct dasd_device * device)2381 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2382 {
2383 if (cancel_work_sync(&device->reload_device))
2384 dasd_put_device(device);
2385 if (cancel_work_sync(&device->kick_validate))
2386 dasd_put_device(device);
2387
2388 return 0;
2389 };
2390
dasd_eckd_basic_to_known(struct dasd_device * device)2391 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2392 {
2393 return dasd_alias_remove_device(device);
2394 };
2395
2396 static int
dasd_eckd_fill_geometry(struct dasd_block * block,struct hd_geometry * geo)2397 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2398 {
2399 struct dasd_eckd_private *private = block->base->private;
2400
2401 if (dasd_check_blocksize(block->bp_block) == 0) {
2402 geo->sectors = recs_per_track(&private->rdc_data,
2403 0, block->bp_block);
2404 }
2405 geo->cylinders = private->rdc_data.no_cyl;
2406 geo->heads = private->rdc_data.trk_per_cyl;
2407 return 0;
2408 }
2409
2410 /*
2411 * Build the TCW request for the format check
2412 */
2413 static struct dasd_ccw_req *
dasd_eckd_build_check_tcw(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,struct eckd_count * fmt_buffer,int rpt)2414 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2415 int enable_pav, struct eckd_count *fmt_buffer,
2416 int rpt)
2417 {
2418 struct dasd_eckd_private *start_priv;
2419 struct dasd_device *startdev = NULL;
2420 struct tidaw *last_tidaw = NULL;
2421 struct dasd_ccw_req *cqr;
2422 struct itcw *itcw;
2423 int itcw_size;
2424 int count;
2425 int rc;
2426 int i;
2427
2428 if (enable_pav)
2429 startdev = dasd_alias_get_start_dev(base);
2430
2431 if (!startdev)
2432 startdev = base;
2433
2434 start_priv = startdev->private;
2435
2436 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2437
2438 /*
2439 * we're adding 'count' amount of tidaw to the itcw.
2440 * calculate the corresponding itcw_size
2441 */
2442 itcw_size = itcw_calc_size(0, count, 0);
2443
2444 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2445 if (IS_ERR(cqr))
2446 return cqr;
2447
2448 start_priv->count++;
2449
2450 itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2451 if (IS_ERR(itcw)) {
2452 rc = -EINVAL;
2453 goto out_err;
2454 }
2455
2456 cqr->cpaddr = itcw_get_tcw(itcw);
2457 rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2458 DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2459 sizeof(struct eckd_count),
2460 count * sizeof(struct eckd_count), 0, rpt);
2461 if (rc)
2462 goto out_err;
2463
2464 for (i = 0; i < count; i++) {
2465 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2466 sizeof(struct eckd_count));
2467 if (IS_ERR(last_tidaw)) {
2468 rc = -EINVAL;
2469 goto out_err;
2470 }
2471 }
2472
2473 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2474 itcw_finalize(itcw);
2475
2476 cqr->cpmode = 1;
2477 cqr->startdev = startdev;
2478 cqr->memdev = startdev;
2479 cqr->basedev = base;
2480 cqr->retries = startdev->default_retries;
2481 cqr->expires = startdev->default_expires * HZ;
2482 cqr->buildclk = get_tod_clock();
2483 cqr->status = DASD_CQR_FILLED;
2484 /* Set flags to suppress output for expected errors */
2485 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2486 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2487
2488 return cqr;
2489
2490 out_err:
2491 dasd_sfree_request(cqr, startdev);
2492
2493 return ERR_PTR(rc);
2494 }
2495
2496 /*
2497 * Build the CCW request for the format check
2498 */
2499 static struct dasd_ccw_req *
dasd_eckd_build_check(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,struct eckd_count * fmt_buffer,int rpt)2500 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2501 int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2502 {
2503 struct dasd_eckd_private *start_priv;
2504 struct dasd_eckd_private *base_priv;
2505 struct dasd_device *startdev = NULL;
2506 struct dasd_ccw_req *cqr;
2507 struct ccw1 *ccw;
2508 void *data;
2509 int cplength, datasize;
2510 int use_prefix;
2511 int count;
2512 int i;
2513
2514 if (enable_pav)
2515 startdev = dasd_alias_get_start_dev(base);
2516
2517 if (!startdev)
2518 startdev = base;
2519
2520 start_priv = startdev->private;
2521 base_priv = base->private;
2522
2523 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2524
2525 use_prefix = base_priv->features.feature[8] & 0x01;
2526
2527 if (use_prefix) {
2528 cplength = 1;
2529 datasize = sizeof(struct PFX_eckd_data);
2530 } else {
2531 cplength = 2;
2532 datasize = sizeof(struct DE_eckd_data) +
2533 sizeof(struct LO_eckd_data);
2534 }
2535 cplength += count;
2536
2537 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2538 if (IS_ERR(cqr))
2539 return cqr;
2540
2541 start_priv->count++;
2542 data = cqr->data;
2543 ccw = cqr->cpaddr;
2544
2545 if (use_prefix) {
2546 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2547 DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2548 count, 0, 0);
2549 } else {
2550 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2551 DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2552
2553 data += sizeof(struct DE_eckd_data);
2554 ccw[-1].flags |= CCW_FLAG_CC;
2555
2556 locate_record(ccw++, data, fdata->start_unit, 0, count,
2557 DASD_ECKD_CCW_READ_COUNT, base, 0);
2558 }
2559
2560 for (i = 0; i < count; i++) {
2561 ccw[-1].flags |= CCW_FLAG_CC;
2562 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2563 ccw->flags = CCW_FLAG_SLI;
2564 ccw->count = 8;
2565 ccw->cda = (__u32)(addr_t) fmt_buffer;
2566 ccw++;
2567 fmt_buffer++;
2568 }
2569
2570 cqr->startdev = startdev;
2571 cqr->memdev = startdev;
2572 cqr->basedev = base;
2573 cqr->retries = DASD_RETRIES;
2574 cqr->expires = startdev->default_expires * HZ;
2575 cqr->buildclk = get_tod_clock();
2576 cqr->status = DASD_CQR_FILLED;
2577 /* Set flags to suppress output for expected errors */
2578 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2579
2580 return cqr;
2581 }
2582
2583 static struct dasd_ccw_req *
dasd_eckd_build_format(struct dasd_device * base,struct dasd_device * startdev,struct format_data_t * fdata,int enable_pav)2584 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2585 struct format_data_t *fdata, int enable_pav)
2586 {
2587 struct dasd_eckd_private *base_priv;
2588 struct dasd_eckd_private *start_priv;
2589 struct dasd_ccw_req *fcp;
2590 struct eckd_count *ect;
2591 struct ch_t address;
2592 struct ccw1 *ccw;
2593 void *data;
2594 int rpt;
2595 int cplength, datasize;
2596 int i, j;
2597 int intensity = 0;
2598 int r0_perm;
2599 int nr_tracks;
2600 int use_prefix;
2601
2602 if (enable_pav)
2603 startdev = dasd_alias_get_start_dev(base);
2604
2605 if (!startdev)
2606 startdev = base;
2607
2608 start_priv = startdev->private;
2609 base_priv = base->private;
2610
2611 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2612
2613 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2614
2615 /*
2616 * fdata->intensity is a bit string that tells us what to do:
2617 * Bit 0: write record zero
2618 * Bit 1: write home address, currently not supported
2619 * Bit 2: invalidate tracks
2620 * Bit 3: use OS/390 compatible disk layout (cdl)
2621 * Bit 4: do not allow storage subsystem to modify record zero
2622 * Only some bit combinations do make sense.
2623 */
2624 if (fdata->intensity & 0x10) {
2625 r0_perm = 0;
2626 intensity = fdata->intensity & ~0x10;
2627 } else {
2628 r0_perm = 1;
2629 intensity = fdata->intensity;
2630 }
2631
2632 use_prefix = base_priv->features.feature[8] & 0x01;
2633
2634 switch (intensity) {
2635 case 0x00: /* Normal format */
2636 case 0x08: /* Normal format, use cdl. */
2637 cplength = 2 + (rpt*nr_tracks);
2638 if (use_prefix)
2639 datasize = sizeof(struct PFX_eckd_data) +
2640 sizeof(struct LO_eckd_data) +
2641 rpt * nr_tracks * sizeof(struct eckd_count);
2642 else
2643 datasize = sizeof(struct DE_eckd_data) +
2644 sizeof(struct LO_eckd_data) +
2645 rpt * nr_tracks * sizeof(struct eckd_count);
2646 break;
2647 case 0x01: /* Write record zero and format track. */
2648 case 0x09: /* Write record zero and format track, use cdl. */
2649 cplength = 2 + rpt * nr_tracks;
2650 if (use_prefix)
2651 datasize = sizeof(struct PFX_eckd_data) +
2652 sizeof(struct LO_eckd_data) +
2653 sizeof(struct eckd_count) +
2654 rpt * nr_tracks * sizeof(struct eckd_count);
2655 else
2656 datasize = sizeof(struct DE_eckd_data) +
2657 sizeof(struct LO_eckd_data) +
2658 sizeof(struct eckd_count) +
2659 rpt * nr_tracks * sizeof(struct eckd_count);
2660 break;
2661 case 0x04: /* Invalidate track. */
2662 case 0x0c: /* Invalidate track, use cdl. */
2663 cplength = 3;
2664 if (use_prefix)
2665 datasize = sizeof(struct PFX_eckd_data) +
2666 sizeof(struct LO_eckd_data) +
2667 sizeof(struct eckd_count);
2668 else
2669 datasize = sizeof(struct DE_eckd_data) +
2670 sizeof(struct LO_eckd_data) +
2671 sizeof(struct eckd_count);
2672 break;
2673 default:
2674 dev_warn(&startdev->cdev->dev,
2675 "An I/O control call used incorrect flags 0x%x\n",
2676 fdata->intensity);
2677 return ERR_PTR(-EINVAL);
2678 }
2679
2680 fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2681 if (IS_ERR(fcp))
2682 return fcp;
2683
2684 start_priv->count++;
2685 data = fcp->data;
2686 ccw = fcp->cpaddr;
2687
2688 switch (intensity & ~0x08) {
2689 case 0x00: /* Normal format. */
2690 if (use_prefix) {
2691 prefix(ccw++, (struct PFX_eckd_data *) data,
2692 fdata->start_unit, fdata->stop_unit,
2693 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2694 /* grant subsystem permission to format R0 */
2695 if (r0_perm)
2696 ((struct PFX_eckd_data *)data)
2697 ->define_extent.ga_extended |= 0x04;
2698 data += sizeof(struct PFX_eckd_data);
2699 } else {
2700 define_extent(ccw++, (struct DE_eckd_data *) data,
2701 fdata->start_unit, fdata->stop_unit,
2702 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2703 /* grant subsystem permission to format R0 */
2704 if (r0_perm)
2705 ((struct DE_eckd_data *) data)
2706 ->ga_extended |= 0x04;
2707 data += sizeof(struct DE_eckd_data);
2708 }
2709 ccw[-1].flags |= CCW_FLAG_CC;
2710 locate_record(ccw++, (struct LO_eckd_data *) data,
2711 fdata->start_unit, 0, rpt*nr_tracks,
2712 DASD_ECKD_CCW_WRITE_CKD, base,
2713 fdata->blksize);
2714 data += sizeof(struct LO_eckd_data);
2715 break;
2716 case 0x01: /* Write record zero + format track. */
2717 if (use_prefix) {
2718 prefix(ccw++, (struct PFX_eckd_data *) data,
2719 fdata->start_unit, fdata->stop_unit,
2720 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2721 base, startdev);
2722 data += sizeof(struct PFX_eckd_data);
2723 } else {
2724 define_extent(ccw++, (struct DE_eckd_data *) data,
2725 fdata->start_unit, fdata->stop_unit,
2726 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2727 data += sizeof(struct DE_eckd_data);
2728 }
2729 ccw[-1].flags |= CCW_FLAG_CC;
2730 locate_record(ccw++, (struct LO_eckd_data *) data,
2731 fdata->start_unit, 0, rpt * nr_tracks + 1,
2732 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2733 base->block->bp_block);
2734 data += sizeof(struct LO_eckd_data);
2735 break;
2736 case 0x04: /* Invalidate track. */
2737 if (use_prefix) {
2738 prefix(ccw++, (struct PFX_eckd_data *) data,
2739 fdata->start_unit, fdata->stop_unit,
2740 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2741 data += sizeof(struct PFX_eckd_data);
2742 } else {
2743 define_extent(ccw++, (struct DE_eckd_data *) data,
2744 fdata->start_unit, fdata->stop_unit,
2745 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2746 data += sizeof(struct DE_eckd_data);
2747 }
2748 ccw[-1].flags |= CCW_FLAG_CC;
2749 locate_record(ccw++, (struct LO_eckd_data *) data,
2750 fdata->start_unit, 0, 1,
2751 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2752 data += sizeof(struct LO_eckd_data);
2753 break;
2754 }
2755
2756 for (j = 0; j < nr_tracks; j++) {
2757 /* calculate cylinder and head for the current track */
2758 set_ch_t(&address,
2759 (fdata->start_unit + j) /
2760 base_priv->rdc_data.trk_per_cyl,
2761 (fdata->start_unit + j) %
2762 base_priv->rdc_data.trk_per_cyl);
2763 if (intensity & 0x01) { /* write record zero */
2764 ect = (struct eckd_count *) data;
2765 data += sizeof(struct eckd_count);
2766 ect->cyl = address.cyl;
2767 ect->head = address.head;
2768 ect->record = 0;
2769 ect->kl = 0;
2770 ect->dl = 8;
2771 ccw[-1].flags |= CCW_FLAG_CC;
2772 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2773 ccw->flags = CCW_FLAG_SLI;
2774 ccw->count = 8;
2775 ccw->cda = (__u32)(addr_t) ect;
2776 ccw++;
2777 }
2778 if ((intensity & ~0x08) & 0x04) { /* erase track */
2779 ect = (struct eckd_count *) data;
2780 data += sizeof(struct eckd_count);
2781 ect->cyl = address.cyl;
2782 ect->head = address.head;
2783 ect->record = 1;
2784 ect->kl = 0;
2785 ect->dl = 0;
2786 ccw[-1].flags |= CCW_FLAG_CC;
2787 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2788 ccw->flags = CCW_FLAG_SLI;
2789 ccw->count = 8;
2790 ccw->cda = (__u32)(addr_t) ect;
2791 } else { /* write remaining records */
2792 for (i = 0; i < rpt; i++) {
2793 ect = (struct eckd_count *) data;
2794 data += sizeof(struct eckd_count);
2795 ect->cyl = address.cyl;
2796 ect->head = address.head;
2797 ect->record = i + 1;
2798 ect->kl = 0;
2799 ect->dl = fdata->blksize;
2800 /*
2801 * Check for special tracks 0-1
2802 * when formatting CDL
2803 */
2804 if ((intensity & 0x08) &&
2805 address.cyl == 0 && address.head == 0) {
2806 if (i < 3) {
2807 ect->kl = 4;
2808 ect->dl = sizes_trk0[i] - 4;
2809 }
2810 }
2811 if ((intensity & 0x08) &&
2812 address.cyl == 0 && address.head == 1) {
2813 ect->kl = 44;
2814 ect->dl = LABEL_SIZE - 44;
2815 }
2816 ccw[-1].flags |= CCW_FLAG_CC;
2817 if (i != 0 || j == 0)
2818 ccw->cmd_code =
2819 DASD_ECKD_CCW_WRITE_CKD;
2820 else
2821 ccw->cmd_code =
2822 DASD_ECKD_CCW_WRITE_CKD_MT;
2823 ccw->flags = CCW_FLAG_SLI;
2824 ccw->count = 8;
2825 ccw->cda = (__u32)(addr_t) ect;
2826 ccw++;
2827 }
2828 }
2829 }
2830
2831 fcp->startdev = startdev;
2832 fcp->memdev = startdev;
2833 fcp->basedev = base;
2834 fcp->retries = 256;
2835 fcp->expires = startdev->default_expires * HZ;
2836 fcp->buildclk = get_tod_clock();
2837 fcp->status = DASD_CQR_FILLED;
2838
2839 return fcp;
2840 }
2841
2842 /*
2843 * Wrapper function to build a CCW request depending on input data
2844 */
2845 static struct dasd_ccw_req *
dasd_eckd_format_build_ccw_req(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,int tpm,struct eckd_count * fmt_buffer,int rpt)2846 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2847 struct format_data_t *fdata, int enable_pav,
2848 int tpm, struct eckd_count *fmt_buffer, int rpt)
2849 {
2850 struct dasd_ccw_req *ccw_req;
2851
2852 if (!fmt_buffer) {
2853 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2854 } else {
2855 if (tpm)
2856 ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2857 enable_pav,
2858 fmt_buffer, rpt);
2859 else
2860 ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2861 fmt_buffer, rpt);
2862 }
2863
2864 return ccw_req;
2865 }
2866
2867 /*
2868 * Sanity checks on format_data
2869 */
dasd_eckd_format_sanity_checks(struct dasd_device * base,struct format_data_t * fdata)2870 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2871 struct format_data_t *fdata)
2872 {
2873 struct dasd_eckd_private *private = base->private;
2874
2875 if (fdata->start_unit >=
2876 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2877 dev_warn(&base->cdev->dev,
2878 "Start track number %u used in formatting is too big\n",
2879 fdata->start_unit);
2880 return -EINVAL;
2881 }
2882 if (fdata->stop_unit >=
2883 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2884 dev_warn(&base->cdev->dev,
2885 "Stop track number %u used in formatting is too big\n",
2886 fdata->stop_unit);
2887 return -EINVAL;
2888 }
2889 if (fdata->start_unit > fdata->stop_unit) {
2890 dev_warn(&base->cdev->dev,
2891 "Start track %u used in formatting exceeds end track\n",
2892 fdata->start_unit);
2893 return -EINVAL;
2894 }
2895 if (dasd_check_blocksize(fdata->blksize) != 0) {
2896 dev_warn(&base->cdev->dev,
2897 "The DASD cannot be formatted with block size %u\n",
2898 fdata->blksize);
2899 return -EINVAL;
2900 }
2901 return 0;
2902 }
2903
2904 /*
2905 * This function will process format_data originally coming from an IOCTL
2906 */
dasd_eckd_format_process_data(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,int tpm,struct eckd_count * fmt_buffer,int rpt,struct irb * irb)2907 static int dasd_eckd_format_process_data(struct dasd_device *base,
2908 struct format_data_t *fdata,
2909 int enable_pav, int tpm,
2910 struct eckd_count *fmt_buffer, int rpt,
2911 struct irb *irb)
2912 {
2913 struct dasd_eckd_private *private = base->private;
2914 struct dasd_ccw_req *cqr, *n;
2915 struct list_head format_queue;
2916 struct dasd_device *device;
2917 char *sense = NULL;
2918 int old_start, old_stop, format_step;
2919 int step, retry;
2920 int rc;
2921
2922 rc = dasd_eckd_format_sanity_checks(base, fdata);
2923 if (rc)
2924 return rc;
2925
2926 INIT_LIST_HEAD(&format_queue);
2927
2928 old_start = fdata->start_unit;
2929 old_stop = fdata->stop_unit;
2930
2931 if (!tpm && fmt_buffer != NULL) {
2932 /* Command Mode / Format Check */
2933 format_step = 1;
2934 } else if (tpm && fmt_buffer != NULL) {
2935 /* Transport Mode / Format Check */
2936 format_step = DASD_CQR_MAX_CCW / rpt;
2937 } else {
2938 /* Normal Formatting */
2939 format_step = DASD_CQR_MAX_CCW /
2940 recs_per_track(&private->rdc_data, 0, fdata->blksize);
2941 }
2942
2943 do {
2944 retry = 0;
2945 while (fdata->start_unit <= old_stop) {
2946 step = fdata->stop_unit - fdata->start_unit + 1;
2947 if (step > format_step) {
2948 fdata->stop_unit =
2949 fdata->start_unit + format_step - 1;
2950 }
2951
2952 cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2953 enable_pav, tpm,
2954 fmt_buffer, rpt);
2955 if (IS_ERR(cqr)) {
2956 rc = PTR_ERR(cqr);
2957 if (rc == -ENOMEM) {
2958 if (list_empty(&format_queue))
2959 goto out;
2960 /*
2961 * not enough memory available, start
2962 * requests retry after first requests
2963 * were finished
2964 */
2965 retry = 1;
2966 break;
2967 }
2968 goto out_err;
2969 }
2970 list_add_tail(&cqr->blocklist, &format_queue);
2971
2972 if (fmt_buffer) {
2973 step = fdata->stop_unit - fdata->start_unit + 1;
2974 fmt_buffer += rpt * step;
2975 }
2976 fdata->start_unit = fdata->stop_unit + 1;
2977 fdata->stop_unit = old_stop;
2978 }
2979
2980 rc = dasd_sleep_on_queue(&format_queue);
2981
2982 out_err:
2983 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2984 device = cqr->startdev;
2985 private = device->private;
2986
2987 if (cqr->status == DASD_CQR_FAILED) {
2988 /*
2989 * Only get sense data if called by format
2990 * check
2991 */
2992 if (fmt_buffer && irb) {
2993 sense = dasd_get_sense(&cqr->irb);
2994 memcpy(irb, &cqr->irb, sizeof(*irb));
2995 }
2996 rc = -EIO;
2997 }
2998 list_del_init(&cqr->blocklist);
2999 dasd_ffree_request(cqr, device);
3000 private->count--;
3001 }
3002
3003 if (rc && rc != -EIO)
3004 goto out;
3005 if (rc == -EIO) {
3006 /*
3007 * In case fewer than the expected records are on the
3008 * track, we will most likely get a 'No Record Found'
3009 * error (in command mode) or a 'File Protected' error
3010 * (in transport mode). Those particular cases shouldn't
3011 * pass the -EIO to the IOCTL, therefore reset the rc
3012 * and continue.
3013 */
3014 if (sense &&
3015 (sense[1] & SNS1_NO_REC_FOUND ||
3016 sense[1] & SNS1_FILE_PROTECTED))
3017 retry = 1;
3018 else
3019 goto out;
3020 }
3021
3022 } while (retry);
3023
3024 out:
3025 fdata->start_unit = old_start;
3026 fdata->stop_unit = old_stop;
3027
3028 return rc;
3029 }
3030
dasd_eckd_format_device(struct dasd_device * base,struct format_data_t * fdata,int enable_pav)3031 static int dasd_eckd_format_device(struct dasd_device *base,
3032 struct format_data_t *fdata, int enable_pav)
3033 {
3034 return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3035 0, NULL);
3036 }
3037
test_and_set_format_track(struct dasd_format_entry * to_format,struct dasd_ccw_req * cqr)3038 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3039 struct dasd_ccw_req *cqr)
3040 {
3041 struct dasd_block *block = cqr->block;
3042 struct dasd_format_entry *format;
3043 unsigned long flags;
3044 bool rc = false;
3045
3046 spin_lock_irqsave(&block->format_lock, flags);
3047 if (cqr->trkcount != atomic_read(&block->trkcount)) {
3048 /*
3049 * The number of formatted tracks has changed after request
3050 * start and we can not tell if the current track was involved.
3051 * To avoid data corruption treat it as if the current track is
3052 * involved
3053 */
3054 rc = true;
3055 goto out;
3056 }
3057 list_for_each_entry(format, &block->format_list, list) {
3058 if (format->track == to_format->track) {
3059 rc = true;
3060 goto out;
3061 }
3062 }
3063 list_add_tail(&to_format->list, &block->format_list);
3064
3065 out:
3066 spin_unlock_irqrestore(&block->format_lock, flags);
3067 return rc;
3068 }
3069
clear_format_track(struct dasd_format_entry * format,struct dasd_block * block)3070 static void clear_format_track(struct dasd_format_entry *format,
3071 struct dasd_block *block)
3072 {
3073 unsigned long flags;
3074
3075 spin_lock_irqsave(&block->format_lock, flags);
3076 atomic_inc(&block->trkcount);
3077 list_del_init(&format->list);
3078 spin_unlock_irqrestore(&block->format_lock, flags);
3079 }
3080
3081 /*
3082 * Callback function to free ESE format requests.
3083 */
dasd_eckd_ese_format_cb(struct dasd_ccw_req * cqr,void * data)3084 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3085 {
3086 struct dasd_device *device = cqr->startdev;
3087 struct dasd_eckd_private *private = device->private;
3088 struct dasd_format_entry *format = data;
3089
3090 clear_format_track(format, cqr->basedev->block);
3091 private->count--;
3092 dasd_ffree_request(cqr, device);
3093 }
3094
3095 static struct dasd_ccw_req *
dasd_eckd_ese_format(struct dasd_device * startdev,struct dasd_ccw_req * cqr,struct irb * irb)3096 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3097 struct irb *irb)
3098 {
3099 struct dasd_eckd_private *private;
3100 struct dasd_format_entry *format;
3101 struct format_data_t fdata;
3102 unsigned int recs_per_trk;
3103 struct dasd_ccw_req *fcqr;
3104 struct dasd_device *base;
3105 struct dasd_block *block;
3106 unsigned int blksize;
3107 struct request *req;
3108 sector_t first_trk;
3109 sector_t last_trk;
3110 sector_t curr_trk;
3111 int rc;
3112
3113 req = dasd_get_callback_data(cqr);
3114 block = cqr->block;
3115 base = block->base;
3116 private = base->private;
3117 blksize = block->bp_block;
3118 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3119 format = &startdev->format_entry;
3120
3121 first_trk = blk_rq_pos(req) >> block->s2b_shift;
3122 sector_div(first_trk, recs_per_trk);
3123 last_trk =
3124 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3125 sector_div(last_trk, recs_per_trk);
3126 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3127 if (rc)
3128 return ERR_PTR(rc);
3129
3130 if (curr_trk < first_trk || curr_trk > last_trk) {
3131 DBF_DEV_EVENT(DBF_WARNING, startdev,
3132 "ESE error track %llu not within range %llu - %llu\n",
3133 curr_trk, first_trk, last_trk);
3134 return ERR_PTR(-EINVAL);
3135 }
3136 format->track = curr_trk;
3137 /* test if track is already in formatting by another thread */
3138 if (test_and_set_format_track(format, cqr)) {
3139 /* this is no real error so do not count down retries */
3140 cqr->retries++;
3141 return ERR_PTR(-EEXIST);
3142 }
3143
3144 fdata.start_unit = curr_trk;
3145 fdata.stop_unit = curr_trk;
3146 fdata.blksize = blksize;
3147 fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3148
3149 rc = dasd_eckd_format_sanity_checks(base, &fdata);
3150 if (rc)
3151 return ERR_PTR(-EINVAL);
3152
3153 /*
3154 * We're building the request with PAV disabled as we're reusing
3155 * the former startdev.
3156 */
3157 fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3158 if (IS_ERR(fcqr))
3159 return fcqr;
3160
3161 fcqr->callback = dasd_eckd_ese_format_cb;
3162 fcqr->callback_data = (void *) format;
3163
3164 return fcqr;
3165 }
3166
3167 /*
3168 * When data is read from an unformatted area of an ESE volume, this function
3169 * returns zeroed data and thereby mimics a read of zero data.
3170 *
3171 * The first unformatted track is the one that got the NRF error, the address is
3172 * encoded in the sense data.
3173 *
3174 * All tracks before have returned valid data and should not be touched.
3175 * All tracks after the unformatted track might be formatted or not. This is
3176 * currently not known, remember the processed data and return the remainder of
3177 * the request to the blocklayer in __dasd_cleanup_cqr().
3178 */
dasd_eckd_ese_read(struct dasd_ccw_req * cqr,struct irb * irb)3179 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3180 {
3181 struct dasd_eckd_private *private;
3182 sector_t first_trk, last_trk;
3183 sector_t first_blk, last_blk;
3184 unsigned int blksize, off;
3185 unsigned int recs_per_trk;
3186 struct dasd_device *base;
3187 struct req_iterator iter;
3188 struct dasd_block *block;
3189 unsigned int skip_block;
3190 unsigned int blk_count;
3191 struct request *req;
3192 struct bio_vec bv;
3193 sector_t curr_trk;
3194 sector_t end_blk;
3195 char *dst;
3196 int rc;
3197
3198 req = (struct request *) cqr->callback_data;
3199 base = cqr->block->base;
3200 blksize = base->block->bp_block;
3201 block = cqr->block;
3202 private = base->private;
3203 skip_block = 0;
3204 blk_count = 0;
3205
3206 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3207 first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3208 sector_div(first_trk, recs_per_trk);
3209 last_trk = last_blk =
3210 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3211 sector_div(last_trk, recs_per_trk);
3212 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3213 if (rc)
3214 return rc;
3215
3216 /* sanity check if the current track from sense data is valid */
3217 if (curr_trk < first_trk || curr_trk > last_trk) {
3218 DBF_DEV_EVENT(DBF_WARNING, base,
3219 "ESE error track %llu not within range %llu - %llu\n",
3220 curr_trk, first_trk, last_trk);
3221 return -EINVAL;
3222 }
3223
3224 /*
3225 * if not the first track got the NRF error we have to skip over valid
3226 * blocks
3227 */
3228 if (curr_trk != first_trk)
3229 skip_block = curr_trk * recs_per_trk - first_blk;
3230
3231 /* we have no information beyond the current track */
3232 end_blk = (curr_trk + 1) * recs_per_trk;
3233
3234 rq_for_each_segment(bv, req, iter) {
3235 dst = page_address(bv.bv_page) + bv.bv_offset;
3236 for (off = 0; off < bv.bv_len; off += blksize) {
3237 if (first_blk + blk_count >= end_blk) {
3238 cqr->proc_bytes = blk_count * blksize;
3239 return 0;
3240 }
3241 if (dst && !skip_block)
3242 memset(dst, 0, blksize);
3243 else
3244 skip_block--;
3245 dst += blksize;
3246 blk_count++;
3247 }
3248 }
3249 return 0;
3250 }
3251
3252 /*
3253 * Helper function to count consecutive records of a single track.
3254 */
dasd_eckd_count_records(struct eckd_count * fmt_buffer,int start,int max)3255 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3256 int max)
3257 {
3258 int head;
3259 int i;
3260
3261 head = fmt_buffer[start].head;
3262
3263 /*
3264 * There are 3 conditions where we stop counting:
3265 * - if data reoccurs (same head and record may reoccur), which may
3266 * happen due to the way DASD_ECKD_CCW_READ_COUNT works
3267 * - when the head changes, because we're iterating over several tracks
3268 * then (DASD_ECKD_CCW_READ_COUNT_MT)
3269 * - when we've reached the end of sensible data in the buffer (the
3270 * record will be 0 then)
3271 */
3272 for (i = start; i < max; i++) {
3273 if (i > start) {
3274 if ((fmt_buffer[i].head == head &&
3275 fmt_buffer[i].record == 1) ||
3276 fmt_buffer[i].head != head ||
3277 fmt_buffer[i].record == 0)
3278 break;
3279 }
3280 }
3281
3282 return i - start;
3283 }
3284
3285 /*
3286 * Evaluate a given range of tracks. Data like number of records, blocksize,
3287 * record ids, and key length are compared with expected data.
3288 *
3289 * If a mismatch occurs, the corresponding error bit is set, as well as
3290 * additional information, depending on the error.
3291 */
dasd_eckd_format_evaluate_tracks(struct eckd_count * fmt_buffer,struct format_check_t * cdata,int rpt_max,int rpt_exp,int trk_per_cyl,int tpm)3292 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3293 struct format_check_t *cdata,
3294 int rpt_max, int rpt_exp,
3295 int trk_per_cyl, int tpm)
3296 {
3297 struct ch_t geo;
3298 int max_entries;
3299 int count = 0;
3300 int trkcount;
3301 int blksize;
3302 int pos = 0;
3303 int i, j;
3304 int kl;
3305
3306 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3307 max_entries = trkcount * rpt_max;
3308
3309 for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3310 /* Calculate the correct next starting position in the buffer */
3311 if (tpm) {
3312 while (fmt_buffer[pos].record == 0 &&
3313 fmt_buffer[pos].dl == 0) {
3314 if (pos++ > max_entries)
3315 break;
3316 }
3317 } else {
3318 if (i != cdata->expect.start_unit)
3319 pos += rpt_max - count;
3320 }
3321
3322 /* Calculate the expected geo values for the current track */
3323 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3324
3325 /* Count and check number of records */
3326 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3327
3328 if (count < rpt_exp) {
3329 cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3330 break;
3331 }
3332 if (count > rpt_exp) {
3333 cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3334 break;
3335 }
3336
3337 for (j = 0; j < count; j++, pos++) {
3338 blksize = cdata->expect.blksize;
3339 kl = 0;
3340
3341 /*
3342 * Set special values when checking CDL formatted
3343 * devices.
3344 */
3345 if ((cdata->expect.intensity & 0x08) &&
3346 geo.cyl == 0 && geo.head == 0) {
3347 if (j < 3) {
3348 blksize = sizes_trk0[j] - 4;
3349 kl = 4;
3350 }
3351 }
3352 if ((cdata->expect.intensity & 0x08) &&
3353 geo.cyl == 0 && geo.head == 1) {
3354 blksize = LABEL_SIZE - 44;
3355 kl = 44;
3356 }
3357
3358 /* Check blocksize */
3359 if (fmt_buffer[pos].dl != blksize) {
3360 cdata->result = DASD_FMT_ERR_BLKSIZE;
3361 goto out;
3362 }
3363 /* Check if key length is 0 */
3364 if (fmt_buffer[pos].kl != kl) {
3365 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3366 goto out;
3367 }
3368 /* Check if record_id is correct */
3369 if (fmt_buffer[pos].cyl != geo.cyl ||
3370 fmt_buffer[pos].head != geo.head ||
3371 fmt_buffer[pos].record != (j + 1)) {
3372 cdata->result = DASD_FMT_ERR_RECORD_ID;
3373 goto out;
3374 }
3375 }
3376 }
3377
3378 out:
3379 /*
3380 * In case of no errors, we need to decrease by one
3381 * to get the correct positions.
3382 */
3383 if (!cdata->result) {
3384 i--;
3385 pos--;
3386 }
3387
3388 cdata->unit = i;
3389 cdata->num_records = count;
3390 cdata->rec = fmt_buffer[pos].record;
3391 cdata->blksize = fmt_buffer[pos].dl;
3392 cdata->key_length = fmt_buffer[pos].kl;
3393 }
3394
3395 /*
3396 * Check the format of a range of tracks of a DASD.
3397 */
dasd_eckd_check_device_format(struct dasd_device * base,struct format_check_t * cdata,int enable_pav)3398 static int dasd_eckd_check_device_format(struct dasd_device *base,
3399 struct format_check_t *cdata,
3400 int enable_pav)
3401 {
3402 struct dasd_eckd_private *private = base->private;
3403 struct eckd_count *fmt_buffer;
3404 struct irb irb;
3405 int rpt_max, rpt_exp;
3406 int fmt_buffer_size;
3407 int trk_per_cyl;
3408 int trkcount;
3409 int tpm = 0;
3410 int rc;
3411
3412 trk_per_cyl = private->rdc_data.trk_per_cyl;
3413
3414 /* Get maximum and expected amount of records per track */
3415 rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3416 rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3417
3418 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3419 fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3420
3421 fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3422 if (!fmt_buffer)
3423 return -ENOMEM;
3424
3425 /*
3426 * A certain FICON feature subset is needed to operate in transport
3427 * mode. Additionally, the support for transport mode is implicitly
3428 * checked by comparing the buffer size with fcx_max_data. As long as
3429 * the buffer size is smaller we can operate in transport mode and
3430 * process multiple tracks. If not, only one track at once is being
3431 * processed using command mode.
3432 */
3433 if ((private->features.feature[40] & 0x04) &&
3434 fmt_buffer_size <= private->fcx_max_data)
3435 tpm = 1;
3436
3437 rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3438 tpm, fmt_buffer, rpt_max, &irb);
3439 if (rc && rc != -EIO)
3440 goto out;
3441 if (rc == -EIO) {
3442 /*
3443 * If our first attempt with transport mode enabled comes back
3444 * with an incorrect length error, we're going to retry the
3445 * check with command mode.
3446 */
3447 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3448 tpm = 0;
3449 rc = dasd_eckd_format_process_data(base, &cdata->expect,
3450 enable_pav, tpm,
3451 fmt_buffer, rpt_max,
3452 &irb);
3453 if (rc)
3454 goto out;
3455 } else {
3456 goto out;
3457 }
3458 }
3459
3460 dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3461 trk_per_cyl, tpm);
3462
3463 out:
3464 kfree(fmt_buffer);
3465
3466 return rc;
3467 }
3468
dasd_eckd_handle_terminated_request(struct dasd_ccw_req * cqr)3469 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3470 {
3471 if (cqr->retries < 0) {
3472 cqr->status = DASD_CQR_FAILED;
3473 return;
3474 }
3475 cqr->status = DASD_CQR_FILLED;
3476 if (cqr->block && (cqr->startdev != cqr->block->base)) {
3477 dasd_eckd_reset_ccw_to_base_io(cqr);
3478 cqr->startdev = cqr->block->base;
3479 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3480 }
3481 };
3482
3483 static dasd_erp_fn_t
dasd_eckd_erp_action(struct dasd_ccw_req * cqr)3484 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3485 {
3486 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3487 struct ccw_device *cdev = device->cdev;
3488
3489 switch (cdev->id.cu_type) {
3490 case 0x3990:
3491 case 0x2105:
3492 case 0x2107:
3493 case 0x1750:
3494 return dasd_3990_erp_action;
3495 case 0x9343:
3496 case 0x3880:
3497 default:
3498 return dasd_default_erp_action;
3499 }
3500 }
3501
3502 static dasd_erp_fn_t
dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)3503 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3504 {
3505 return dasd_default_erp_postaction;
3506 }
3507
dasd_eckd_check_for_device_change(struct dasd_device * device,struct dasd_ccw_req * cqr,struct irb * irb)3508 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3509 struct dasd_ccw_req *cqr,
3510 struct irb *irb)
3511 {
3512 char mask;
3513 char *sense = NULL;
3514 struct dasd_eckd_private *private = device->private;
3515
3516 /* first of all check for state change pending interrupt */
3517 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3518 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3519 /*
3520 * for alias only, not in offline processing
3521 * and only if not suspended
3522 */
3523 if (!device->block && private->lcu &&
3524 device->state == DASD_STATE_ONLINE &&
3525 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3526 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3527 /* schedule worker to reload device */
3528 dasd_reload_device(device);
3529 }
3530 dasd_generic_handle_state_change(device);
3531 return;
3532 }
3533
3534 sense = dasd_get_sense(irb);
3535 if (!sense)
3536 return;
3537
3538 /* summary unit check */
3539 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3540 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3541 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3542 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3543 "eckd suc: device already notified");
3544 return;
3545 }
3546 sense = dasd_get_sense(irb);
3547 if (!sense) {
3548 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3549 "eckd suc: no reason code available");
3550 clear_bit(DASD_FLAG_SUC, &device->flags);
3551 return;
3552
3553 }
3554 private->suc_reason = sense[8];
3555 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3556 "eckd handle summary unit check: reason",
3557 private->suc_reason);
3558 dasd_get_device(device);
3559 if (!schedule_work(&device->suc_work))
3560 dasd_put_device(device);
3561
3562 return;
3563 }
3564
3565 /* service information message SIM */
3566 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3567 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3568 dasd_3990_erp_handle_sim(device, sense);
3569 return;
3570 }
3571
3572 /* loss of device reservation is handled via base devices only
3573 * as alias devices may be used with several bases
3574 */
3575 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3576 (sense[7] == 0x3F) &&
3577 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3578 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3579 if (device->features & DASD_FEATURE_FAILONSLCK)
3580 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3581 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3582 dev_err(&device->cdev->dev,
3583 "The device reservation was lost\n");
3584 }
3585 }
3586
dasd_eckd_ras_sanity_checks(struct dasd_device * device,unsigned int first_trk,unsigned int last_trk)3587 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3588 unsigned int first_trk,
3589 unsigned int last_trk)
3590 {
3591 struct dasd_eckd_private *private = device->private;
3592 unsigned int trks_per_vol;
3593 int rc = 0;
3594
3595 trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3596
3597 if (first_trk >= trks_per_vol) {
3598 dev_warn(&device->cdev->dev,
3599 "Start track number %u used in the space release command is too big\n",
3600 first_trk);
3601 rc = -EINVAL;
3602 } else if (last_trk >= trks_per_vol) {
3603 dev_warn(&device->cdev->dev,
3604 "Stop track number %u used in the space release command is too big\n",
3605 last_trk);
3606 rc = -EINVAL;
3607 } else if (first_trk > last_trk) {
3608 dev_warn(&device->cdev->dev,
3609 "Start track %u used in the space release command exceeds the end track\n",
3610 first_trk);
3611 rc = -EINVAL;
3612 }
3613 return rc;
3614 }
3615
3616 /*
3617 * Helper function to count the amount of involved extents within a given range
3618 * with extent alignment in mind.
3619 */
count_exts(unsigned int from,unsigned int to,int trks_per_ext)3620 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3621 {
3622 int cur_pos = 0;
3623 int count = 0;
3624 int tmp;
3625
3626 if (from == to)
3627 return 1;
3628
3629 /* Count first partial extent */
3630 if (from % trks_per_ext != 0) {
3631 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3632 if (tmp > to)
3633 tmp = to;
3634 cur_pos = tmp - from + 1;
3635 count++;
3636 }
3637 /* Count full extents */
3638 if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3639 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3640 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3641 cur_pos = tmp;
3642 }
3643 /* Count last partial extent */
3644 if (cur_pos < to)
3645 count++;
3646
3647 return count;
3648 }
3649
3650 /*
3651 * Release allocated space for a given range or an entire volume.
3652 */
3653 static struct dasd_ccw_req *
dasd_eckd_dso_ras(struct dasd_device * device,struct dasd_block * block,struct request * req,unsigned int first_trk,unsigned int last_trk,int by_extent)3654 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3655 struct request *req, unsigned int first_trk,
3656 unsigned int last_trk, int by_extent)
3657 {
3658 struct dasd_eckd_private *private = device->private;
3659 struct dasd_dso_ras_ext_range *ras_range;
3660 struct dasd_rssd_features *features;
3661 struct dasd_dso_ras_data *ras_data;
3662 u16 heads, beg_head, end_head;
3663 int cur_to_trk, cur_from_trk;
3664 struct dasd_ccw_req *cqr;
3665 u32 beg_cyl, end_cyl;
3666 struct ccw1 *ccw;
3667 int trks_per_ext;
3668 size_t ras_size;
3669 size_t size;
3670 int nr_exts;
3671 void *rq;
3672 int i;
3673
3674 if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3675 return ERR_PTR(-EINVAL);
3676
3677 rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3678
3679 features = &private->features;
3680
3681 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3682 nr_exts = 0;
3683 if (by_extent)
3684 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3685 ras_size = sizeof(*ras_data);
3686 size = ras_size + (nr_exts * sizeof(*ras_range));
3687
3688 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3689 if (IS_ERR(cqr)) {
3690 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3691 "Could not allocate RAS request");
3692 return cqr;
3693 }
3694
3695 ras_data = cqr->data;
3696 memset(ras_data, 0, size);
3697
3698 ras_data->order = DSO_ORDER_RAS;
3699 ras_data->flags.vol_type = 0; /* CKD volume */
3700 /* Release specified extents or entire volume */
3701 ras_data->op_flags.by_extent = by_extent;
3702 /*
3703 * This bit guarantees initialisation of tracks within an extent that is
3704 * not fully specified, but is only supported with a certain feature
3705 * subset.
3706 */
3707 ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3708 ras_data->lss = private->ned->ID;
3709 ras_data->dev_addr = private->ned->unit_addr;
3710 ras_data->nr_exts = nr_exts;
3711
3712 if (by_extent) {
3713 heads = private->rdc_data.trk_per_cyl;
3714 cur_from_trk = first_trk;
3715 cur_to_trk = first_trk + trks_per_ext -
3716 (first_trk % trks_per_ext) - 1;
3717 if (cur_to_trk > last_trk)
3718 cur_to_trk = last_trk;
3719 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3720
3721 for (i = 0; i < nr_exts; i++) {
3722 beg_cyl = cur_from_trk / heads;
3723 beg_head = cur_from_trk % heads;
3724 end_cyl = cur_to_trk / heads;
3725 end_head = cur_to_trk % heads;
3726
3727 set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3728 set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3729
3730 cur_from_trk = cur_to_trk + 1;
3731 cur_to_trk = cur_from_trk + trks_per_ext - 1;
3732 if (cur_to_trk > last_trk)
3733 cur_to_trk = last_trk;
3734 ras_range++;
3735 }
3736 }
3737
3738 ccw = cqr->cpaddr;
3739 ccw->cda = (__u32)(addr_t)cqr->data;
3740 ccw->cmd_code = DASD_ECKD_CCW_DSO;
3741 ccw->count = size;
3742
3743 cqr->startdev = device;
3744 cqr->memdev = device;
3745 cqr->block = block;
3746 cqr->retries = 256;
3747 cqr->expires = device->default_expires * HZ;
3748 cqr->buildclk = get_tod_clock();
3749 cqr->status = DASD_CQR_FILLED;
3750
3751 return cqr;
3752 }
3753
dasd_eckd_release_space_full(struct dasd_device * device)3754 static int dasd_eckd_release_space_full(struct dasd_device *device)
3755 {
3756 struct dasd_ccw_req *cqr;
3757 int rc;
3758
3759 cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3760 if (IS_ERR(cqr))
3761 return PTR_ERR(cqr);
3762
3763 rc = dasd_sleep_on_interruptible(cqr);
3764
3765 dasd_sfree_request(cqr, cqr->memdev);
3766
3767 return rc;
3768 }
3769
dasd_eckd_release_space_trks(struct dasd_device * device,unsigned int from,unsigned int to)3770 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3771 unsigned int from, unsigned int to)
3772 {
3773 struct dasd_eckd_private *private = device->private;
3774 struct dasd_block *block = device->block;
3775 struct dasd_ccw_req *cqr, *n;
3776 struct list_head ras_queue;
3777 unsigned int device_exts;
3778 int trks_per_ext;
3779 int stop, step;
3780 int cur_pos;
3781 int rc = 0;
3782 int retry;
3783
3784 INIT_LIST_HEAD(&ras_queue);
3785
3786 device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3787 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3788
3789 /* Make sure device limits are not exceeded */
3790 step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3791 cur_pos = from;
3792
3793 do {
3794 retry = 0;
3795 while (cur_pos < to) {
3796 stop = cur_pos + step -
3797 ((cur_pos + step) % trks_per_ext) - 1;
3798 if (stop > to)
3799 stop = to;
3800
3801 cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3802 if (IS_ERR(cqr)) {
3803 rc = PTR_ERR(cqr);
3804 if (rc == -ENOMEM) {
3805 if (list_empty(&ras_queue))
3806 goto out;
3807 retry = 1;
3808 break;
3809 }
3810 goto err_out;
3811 }
3812
3813 spin_lock_irq(&block->queue_lock);
3814 list_add_tail(&cqr->blocklist, &ras_queue);
3815 spin_unlock_irq(&block->queue_lock);
3816 cur_pos = stop + 1;
3817 }
3818
3819 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3820
3821 err_out:
3822 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3823 device = cqr->startdev;
3824 private = device->private;
3825
3826 spin_lock_irq(&block->queue_lock);
3827 list_del_init(&cqr->blocklist);
3828 spin_unlock_irq(&block->queue_lock);
3829 dasd_sfree_request(cqr, device);
3830 private->count--;
3831 }
3832 } while (retry);
3833
3834 out:
3835 return rc;
3836 }
3837
dasd_eckd_release_space(struct dasd_device * device,struct format_data_t * rdata)3838 static int dasd_eckd_release_space(struct dasd_device *device,
3839 struct format_data_t *rdata)
3840 {
3841 if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3842 return dasd_eckd_release_space_full(device);
3843 else if (rdata->intensity == 0)
3844 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3845 rdata->stop_unit);
3846 else
3847 return -EINVAL;
3848 }
3849
dasd_eckd_build_cp_cmd_single(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)3850 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3851 struct dasd_device *startdev,
3852 struct dasd_block *block,
3853 struct request *req,
3854 sector_t first_rec,
3855 sector_t last_rec,
3856 sector_t first_trk,
3857 sector_t last_trk,
3858 unsigned int first_offs,
3859 unsigned int last_offs,
3860 unsigned int blk_per_trk,
3861 unsigned int blksize)
3862 {
3863 struct dasd_eckd_private *private;
3864 unsigned long *idaws;
3865 struct LO_eckd_data *LO_data;
3866 struct dasd_ccw_req *cqr;
3867 struct ccw1 *ccw;
3868 struct req_iterator iter;
3869 struct bio_vec bv;
3870 char *dst;
3871 unsigned int off;
3872 int count, cidaw, cplength, datasize;
3873 sector_t recid;
3874 unsigned char cmd, rcmd;
3875 int use_prefix;
3876 struct dasd_device *basedev;
3877
3878 basedev = block->base;
3879 private = basedev->private;
3880 if (rq_data_dir(req) == READ)
3881 cmd = DASD_ECKD_CCW_READ_MT;
3882 else if (rq_data_dir(req) == WRITE)
3883 cmd = DASD_ECKD_CCW_WRITE_MT;
3884 else
3885 return ERR_PTR(-EINVAL);
3886
3887 /* Check struct bio and count the number of blocks for the request. */
3888 count = 0;
3889 cidaw = 0;
3890 rq_for_each_segment(bv, req, iter) {
3891 if (bv.bv_len & (blksize - 1))
3892 /* Eckd can only do full blocks. */
3893 return ERR_PTR(-EINVAL);
3894 count += bv.bv_len >> (block->s2b_shift + 9);
3895 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3896 cidaw += bv.bv_len >> (block->s2b_shift + 9);
3897 }
3898 /* Paranoia. */
3899 if (count != last_rec - first_rec + 1)
3900 return ERR_PTR(-EINVAL);
3901
3902 /* use the prefix command if available */
3903 use_prefix = private->features.feature[8] & 0x01;
3904 if (use_prefix) {
3905 /* 1x prefix + number of blocks */
3906 cplength = 2 + count;
3907 /* 1x prefix + cidaws*sizeof(long) */
3908 datasize = sizeof(struct PFX_eckd_data) +
3909 sizeof(struct LO_eckd_data) +
3910 cidaw * sizeof(unsigned long);
3911 } else {
3912 /* 1x define extent + 1x locate record + number of blocks */
3913 cplength = 2 + count;
3914 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3915 datasize = sizeof(struct DE_eckd_data) +
3916 sizeof(struct LO_eckd_data) +
3917 cidaw * sizeof(unsigned long);
3918 }
3919 /* Find out the number of additional locate record ccws for cdl. */
3920 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3921 if (last_rec >= 2*blk_per_trk)
3922 count = 2*blk_per_trk - first_rec;
3923 cplength += count;
3924 datasize += count*sizeof(struct LO_eckd_data);
3925 }
3926 /* Allocate the ccw request. */
3927 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3928 startdev, blk_mq_rq_to_pdu(req));
3929 if (IS_ERR(cqr))
3930 return cqr;
3931 ccw = cqr->cpaddr;
3932 /* First ccw is define extent or prefix. */
3933 if (use_prefix) {
3934 if (prefix(ccw++, cqr->data, first_trk,
3935 last_trk, cmd, basedev, startdev) == -EAGAIN) {
3936 /* Clock not in sync and XRC is enabled.
3937 * Try again later.
3938 */
3939 dasd_sfree_request(cqr, startdev);
3940 return ERR_PTR(-EAGAIN);
3941 }
3942 idaws = (unsigned long *) (cqr->data +
3943 sizeof(struct PFX_eckd_data));
3944 } else {
3945 if (define_extent(ccw++, cqr->data, first_trk,
3946 last_trk, cmd, basedev, 0) == -EAGAIN) {
3947 /* Clock not in sync and XRC is enabled.
3948 * Try again later.
3949 */
3950 dasd_sfree_request(cqr, startdev);
3951 return ERR_PTR(-EAGAIN);
3952 }
3953 idaws = (unsigned long *) (cqr->data +
3954 sizeof(struct DE_eckd_data));
3955 }
3956 /* Build locate_record+read/write/ccws. */
3957 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3958 recid = first_rec;
3959 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3960 /* Only standard blocks so there is just one locate record. */
3961 ccw[-1].flags |= CCW_FLAG_CC;
3962 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3963 last_rec - recid + 1, cmd, basedev, blksize);
3964 }
3965 rq_for_each_segment(bv, req, iter) {
3966 dst = page_address(bv.bv_page) + bv.bv_offset;
3967 if (dasd_page_cache) {
3968 char *copy = kmem_cache_alloc(dasd_page_cache,
3969 GFP_DMA | __GFP_NOWARN);
3970 if (copy && rq_data_dir(req) == WRITE)
3971 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3972 if (copy)
3973 dst = copy + bv.bv_offset;
3974 }
3975 for (off = 0; off < bv.bv_len; off += blksize) {
3976 sector_t trkid = recid;
3977 unsigned int recoffs = sector_div(trkid, blk_per_trk);
3978 rcmd = cmd;
3979 count = blksize;
3980 /* Locate record for cdl special block ? */
3981 if (private->uses_cdl && recid < 2*blk_per_trk) {
3982 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3983 rcmd |= 0x8;
3984 count = dasd_eckd_cdl_reclen(recid);
3985 if (count < blksize &&
3986 rq_data_dir(req) == READ)
3987 memset(dst + count, 0xe5,
3988 blksize - count);
3989 }
3990 ccw[-1].flags |= CCW_FLAG_CC;
3991 locate_record(ccw++, LO_data++,
3992 trkid, recoffs + 1,
3993 1, rcmd, basedev, count);
3994 }
3995 /* Locate record for standard blocks ? */
3996 if (private->uses_cdl && recid == 2*blk_per_trk) {
3997 ccw[-1].flags |= CCW_FLAG_CC;
3998 locate_record(ccw++, LO_data++,
3999 trkid, recoffs + 1,
4000 last_rec - recid + 1,
4001 cmd, basedev, count);
4002 }
4003 /* Read/write ccw. */
4004 ccw[-1].flags |= CCW_FLAG_CC;
4005 ccw->cmd_code = rcmd;
4006 ccw->count = count;
4007 if (idal_is_needed(dst, blksize)) {
4008 ccw->cda = (__u32)(addr_t) idaws;
4009 ccw->flags = CCW_FLAG_IDA;
4010 idaws = idal_create_words(idaws, dst, blksize);
4011 } else {
4012 ccw->cda = (__u32)(addr_t) dst;
4013 ccw->flags = 0;
4014 }
4015 ccw++;
4016 dst += blksize;
4017 recid++;
4018 }
4019 }
4020 if (blk_noretry_request(req) ||
4021 block->base->features & DASD_FEATURE_FAILFAST)
4022 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4023 cqr->startdev = startdev;
4024 cqr->memdev = startdev;
4025 cqr->block = block;
4026 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4027 cqr->lpm = dasd_path_get_ppm(startdev);
4028 cqr->retries = startdev->default_retries;
4029 cqr->buildclk = get_tod_clock();
4030 cqr->status = DASD_CQR_FILLED;
4031
4032 /* Set flags to suppress output for expected errors */
4033 if (dasd_eckd_is_ese(basedev)) {
4034 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4035 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4036 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4037 }
4038
4039 return cqr;
4040 }
4041
dasd_eckd_build_cp_cmd_track(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)4042 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4043 struct dasd_device *startdev,
4044 struct dasd_block *block,
4045 struct request *req,
4046 sector_t first_rec,
4047 sector_t last_rec,
4048 sector_t first_trk,
4049 sector_t last_trk,
4050 unsigned int first_offs,
4051 unsigned int last_offs,
4052 unsigned int blk_per_trk,
4053 unsigned int blksize)
4054 {
4055 unsigned long *idaws;
4056 struct dasd_ccw_req *cqr;
4057 struct ccw1 *ccw;
4058 struct req_iterator iter;
4059 struct bio_vec bv;
4060 char *dst, *idaw_dst;
4061 unsigned int cidaw, cplength, datasize;
4062 unsigned int tlf;
4063 sector_t recid;
4064 unsigned char cmd;
4065 struct dasd_device *basedev;
4066 unsigned int trkcount, count, count_to_trk_end;
4067 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4068 unsigned char new_track, end_idaw;
4069 sector_t trkid;
4070 unsigned int recoffs;
4071
4072 basedev = block->base;
4073 if (rq_data_dir(req) == READ)
4074 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4075 else if (rq_data_dir(req) == WRITE)
4076 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4077 else
4078 return ERR_PTR(-EINVAL);
4079
4080 /* Track based I/O needs IDAWs for each page, and not just for
4081 * 64 bit addresses. We need additional idals for pages
4082 * that get filled from two tracks, so we use the number
4083 * of records as upper limit.
4084 */
4085 cidaw = last_rec - first_rec + 1;
4086 trkcount = last_trk - first_trk + 1;
4087
4088 /* 1x prefix + one read/write ccw per track */
4089 cplength = 1 + trkcount;
4090
4091 datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4092
4093 /* Allocate the ccw request. */
4094 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4095 startdev, blk_mq_rq_to_pdu(req));
4096 if (IS_ERR(cqr))
4097 return cqr;
4098 ccw = cqr->cpaddr;
4099 /* transfer length factor: how many bytes to read from the last track */
4100 if (first_trk == last_trk)
4101 tlf = last_offs - first_offs + 1;
4102 else
4103 tlf = last_offs + 1;
4104 tlf *= blksize;
4105
4106 if (prefix_LRE(ccw++, cqr->data, first_trk,
4107 last_trk, cmd, basedev, startdev,
4108 1 /* format */, first_offs + 1,
4109 trkcount, blksize,
4110 tlf) == -EAGAIN) {
4111 /* Clock not in sync and XRC is enabled.
4112 * Try again later.
4113 */
4114 dasd_sfree_request(cqr, startdev);
4115 return ERR_PTR(-EAGAIN);
4116 }
4117
4118 /*
4119 * The translation of request into ccw programs must meet the
4120 * following conditions:
4121 * - all idaws but the first and the last must address full pages
4122 * (or 2K blocks on 31-bit)
4123 * - the scope of a ccw and it's idal ends with the track boundaries
4124 */
4125 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4126 recid = first_rec;
4127 new_track = 1;
4128 end_idaw = 0;
4129 len_to_track_end = 0;
4130 idaw_dst = NULL;
4131 idaw_len = 0;
4132 rq_for_each_segment(bv, req, iter) {
4133 dst = page_address(bv.bv_page) + bv.bv_offset;
4134 seg_len = bv.bv_len;
4135 while (seg_len) {
4136 if (new_track) {
4137 trkid = recid;
4138 recoffs = sector_div(trkid, blk_per_trk);
4139 count_to_trk_end = blk_per_trk - recoffs;
4140 count = min((last_rec - recid + 1),
4141 (sector_t)count_to_trk_end);
4142 len_to_track_end = count * blksize;
4143 ccw[-1].flags |= CCW_FLAG_CC;
4144 ccw->cmd_code = cmd;
4145 ccw->count = len_to_track_end;
4146 ccw->cda = (__u32)(addr_t)idaws;
4147 ccw->flags = CCW_FLAG_IDA;
4148 ccw++;
4149 recid += count;
4150 new_track = 0;
4151 /* first idaw for a ccw may start anywhere */
4152 if (!idaw_dst)
4153 idaw_dst = dst;
4154 }
4155 /* If we start a new idaw, we must make sure that it
4156 * starts on an IDA_BLOCK_SIZE boundary.
4157 * If we continue an idaw, we must make sure that the
4158 * current segment begins where the so far accumulated
4159 * idaw ends
4160 */
4161 if (!idaw_dst) {
4162 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
4163 dasd_sfree_request(cqr, startdev);
4164 return ERR_PTR(-ERANGE);
4165 } else
4166 idaw_dst = dst;
4167 }
4168 if ((idaw_dst + idaw_len) != dst) {
4169 dasd_sfree_request(cqr, startdev);
4170 return ERR_PTR(-ERANGE);
4171 }
4172 part_len = min(seg_len, len_to_track_end);
4173 seg_len -= part_len;
4174 dst += part_len;
4175 idaw_len += part_len;
4176 len_to_track_end -= part_len;
4177 /* collected memory area ends on an IDA_BLOCK border,
4178 * -> create an idaw
4179 * idal_create_words will handle cases where idaw_len
4180 * is larger then IDA_BLOCK_SIZE
4181 */
4182 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
4183 end_idaw = 1;
4184 /* We also need to end the idaw at track end */
4185 if (!len_to_track_end) {
4186 new_track = 1;
4187 end_idaw = 1;
4188 }
4189 if (end_idaw) {
4190 idaws = idal_create_words(idaws, idaw_dst,
4191 idaw_len);
4192 idaw_dst = NULL;
4193 idaw_len = 0;
4194 end_idaw = 0;
4195 }
4196 }
4197 }
4198
4199 if (blk_noretry_request(req) ||
4200 block->base->features & DASD_FEATURE_FAILFAST)
4201 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4202 cqr->startdev = startdev;
4203 cqr->memdev = startdev;
4204 cqr->block = block;
4205 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4206 cqr->lpm = dasd_path_get_ppm(startdev);
4207 cqr->retries = startdev->default_retries;
4208 cqr->buildclk = get_tod_clock();
4209 cqr->status = DASD_CQR_FILLED;
4210
4211 /* Set flags to suppress output for expected errors */
4212 if (dasd_eckd_is_ese(basedev))
4213 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4214
4215 return cqr;
4216 }
4217
prepare_itcw(struct itcw * itcw,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev,unsigned int rec_on_trk,int count,unsigned int blksize,unsigned int total_data_size,unsigned int tlf,unsigned int blk_per_trk)4218 static int prepare_itcw(struct itcw *itcw,
4219 unsigned int trk, unsigned int totrk, int cmd,
4220 struct dasd_device *basedev,
4221 struct dasd_device *startdev,
4222 unsigned int rec_on_trk, int count,
4223 unsigned int blksize,
4224 unsigned int total_data_size,
4225 unsigned int tlf,
4226 unsigned int blk_per_trk)
4227 {
4228 struct PFX_eckd_data pfxdata;
4229 struct dasd_eckd_private *basepriv, *startpriv;
4230 struct DE_eckd_data *dedata;
4231 struct LRE_eckd_data *lredata;
4232 struct dcw *dcw;
4233
4234 u32 begcyl, endcyl;
4235 u16 heads, beghead, endhead;
4236 u8 pfx_cmd;
4237
4238 int rc = 0;
4239 int sector = 0;
4240 int dn, d;
4241
4242
4243 /* setup prefix data */
4244 basepriv = basedev->private;
4245 startpriv = startdev->private;
4246 dedata = &pfxdata.define_extent;
4247 lredata = &pfxdata.locate_record;
4248
4249 memset(&pfxdata, 0, sizeof(pfxdata));
4250 pfxdata.format = 1; /* PFX with LRE */
4251 pfxdata.base_address = basepriv->ned->unit_addr;
4252 pfxdata.base_lss = basepriv->ned->ID;
4253 pfxdata.validity.define_extent = 1;
4254
4255 /* private uid is kept up to date, conf_data may be outdated */
4256 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4257 pfxdata.validity.verify_base = 1;
4258
4259 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4260 pfxdata.validity.verify_base = 1;
4261 pfxdata.validity.hyper_pav = 1;
4262 }
4263
4264 switch (cmd) {
4265 case DASD_ECKD_CCW_READ_TRACK_DATA:
4266 dedata->mask.perm = 0x1;
4267 dedata->attributes.operation = basepriv->attrib.operation;
4268 dedata->blk_size = blksize;
4269 dedata->ga_extended |= 0x42;
4270 lredata->operation.orientation = 0x0;
4271 lredata->operation.operation = 0x0C;
4272 lredata->auxiliary.check_bytes = 0x01;
4273 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4274 break;
4275 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4276 dedata->mask.perm = 0x02;
4277 dedata->attributes.operation = basepriv->attrib.operation;
4278 dedata->blk_size = blksize;
4279 rc = set_timestamp(NULL, dedata, basedev);
4280 dedata->ga_extended |= 0x42;
4281 lredata->operation.orientation = 0x0;
4282 lredata->operation.operation = 0x3F;
4283 lredata->extended_operation = 0x23;
4284 lredata->auxiliary.check_bytes = 0x2;
4285 /*
4286 * If XRC is supported the System Time Stamp is set. The
4287 * validity of the time stamp must be reflected in the prefix
4288 * data as well.
4289 */
4290 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4291 pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4292 pfx_cmd = DASD_ECKD_CCW_PFX;
4293 break;
4294 case DASD_ECKD_CCW_READ_COUNT_MT:
4295 dedata->mask.perm = 0x1;
4296 dedata->attributes.operation = DASD_BYPASS_CACHE;
4297 dedata->ga_extended |= 0x42;
4298 dedata->blk_size = blksize;
4299 lredata->operation.orientation = 0x2;
4300 lredata->operation.operation = 0x16;
4301 lredata->auxiliary.check_bytes = 0x01;
4302 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4303 break;
4304 default:
4305 DBF_DEV_EVENT(DBF_ERR, basedev,
4306 "prepare itcw, unknown opcode 0x%x", cmd);
4307 BUG();
4308 break;
4309 }
4310 if (rc)
4311 return rc;
4312
4313 dedata->attributes.mode = 0x3; /* ECKD */
4314
4315 heads = basepriv->rdc_data.trk_per_cyl;
4316 begcyl = trk / heads;
4317 beghead = trk % heads;
4318 endcyl = totrk / heads;
4319 endhead = totrk % heads;
4320
4321 /* check for sequential prestage - enhance cylinder range */
4322 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4323 dedata->attributes.operation == DASD_SEQ_ACCESS) {
4324
4325 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4326 endcyl += basepriv->attrib.nr_cyl;
4327 else
4328 endcyl = (basepriv->real_cyl - 1);
4329 }
4330
4331 set_ch_t(&dedata->beg_ext, begcyl, beghead);
4332 set_ch_t(&dedata->end_ext, endcyl, endhead);
4333
4334 dedata->ep_format = 0x20; /* records per track is valid */
4335 dedata->ep_rec_per_track = blk_per_trk;
4336
4337 if (rec_on_trk) {
4338 switch (basepriv->rdc_data.dev_type) {
4339 case 0x3390:
4340 dn = ceil_quot(blksize + 6, 232);
4341 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4342 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4343 break;
4344 case 0x3380:
4345 d = 7 + ceil_quot(blksize + 12, 32);
4346 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4347 break;
4348 }
4349 }
4350
4351 if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4352 lredata->auxiliary.length_valid = 0;
4353 lredata->auxiliary.length_scope = 0;
4354 lredata->sector = 0xff;
4355 } else {
4356 lredata->auxiliary.length_valid = 1;
4357 lredata->auxiliary.length_scope = 1;
4358 lredata->sector = sector;
4359 }
4360 lredata->auxiliary.imbedded_ccw_valid = 1;
4361 lredata->length = tlf;
4362 lredata->imbedded_ccw = cmd;
4363 lredata->count = count;
4364 set_ch_t(&lredata->seek_addr, begcyl, beghead);
4365 lredata->search_arg.cyl = lredata->seek_addr.cyl;
4366 lredata->search_arg.head = lredata->seek_addr.head;
4367 lredata->search_arg.record = rec_on_trk;
4368
4369 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4370 &pfxdata, sizeof(pfxdata), total_data_size);
4371 return PTR_ERR_OR_ZERO(dcw);
4372 }
4373
dasd_eckd_build_cp_tpm_track(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)4374 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4375 struct dasd_device *startdev,
4376 struct dasd_block *block,
4377 struct request *req,
4378 sector_t first_rec,
4379 sector_t last_rec,
4380 sector_t first_trk,
4381 sector_t last_trk,
4382 unsigned int first_offs,
4383 unsigned int last_offs,
4384 unsigned int blk_per_trk,
4385 unsigned int blksize)
4386 {
4387 struct dasd_ccw_req *cqr;
4388 struct req_iterator iter;
4389 struct bio_vec bv;
4390 char *dst;
4391 unsigned int trkcount, ctidaw;
4392 unsigned char cmd;
4393 struct dasd_device *basedev;
4394 unsigned int tlf;
4395 struct itcw *itcw;
4396 struct tidaw *last_tidaw = NULL;
4397 int itcw_op;
4398 size_t itcw_size;
4399 u8 tidaw_flags;
4400 unsigned int seg_len, part_len, len_to_track_end;
4401 unsigned char new_track;
4402 sector_t recid, trkid;
4403 unsigned int offs;
4404 unsigned int count, count_to_trk_end;
4405 int ret;
4406
4407 basedev = block->base;
4408 if (rq_data_dir(req) == READ) {
4409 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4410 itcw_op = ITCW_OP_READ;
4411 } else if (rq_data_dir(req) == WRITE) {
4412 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4413 itcw_op = ITCW_OP_WRITE;
4414 } else
4415 return ERR_PTR(-EINVAL);
4416
4417 /* trackbased I/O needs address all memory via TIDAWs,
4418 * not just for 64 bit addresses. This allows us to map
4419 * each segment directly to one tidaw.
4420 * In the case of write requests, additional tidaws may
4421 * be needed when a segment crosses a track boundary.
4422 */
4423 trkcount = last_trk - first_trk + 1;
4424 ctidaw = 0;
4425 rq_for_each_segment(bv, req, iter) {
4426 ++ctidaw;
4427 }
4428 if (rq_data_dir(req) == WRITE)
4429 ctidaw += (last_trk - first_trk);
4430
4431 /* Allocate the ccw request. */
4432 itcw_size = itcw_calc_size(0, ctidaw, 0);
4433 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4434 blk_mq_rq_to_pdu(req));
4435 if (IS_ERR(cqr))
4436 return cqr;
4437
4438 /* transfer length factor: how many bytes to read from the last track */
4439 if (first_trk == last_trk)
4440 tlf = last_offs - first_offs + 1;
4441 else
4442 tlf = last_offs + 1;
4443 tlf *= blksize;
4444
4445 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4446 if (IS_ERR(itcw)) {
4447 ret = -EINVAL;
4448 goto out_error;
4449 }
4450 cqr->cpaddr = itcw_get_tcw(itcw);
4451 if (prepare_itcw(itcw, first_trk, last_trk,
4452 cmd, basedev, startdev,
4453 first_offs + 1,
4454 trkcount, blksize,
4455 (last_rec - first_rec + 1) * blksize,
4456 tlf, blk_per_trk) == -EAGAIN) {
4457 /* Clock not in sync and XRC is enabled.
4458 * Try again later.
4459 */
4460 ret = -EAGAIN;
4461 goto out_error;
4462 }
4463 len_to_track_end = 0;
4464 /*
4465 * A tidaw can address 4k of memory, but must not cross page boundaries
4466 * We can let the block layer handle this by setting
4467 * blk_queue_segment_boundary to page boundaries and
4468 * blk_max_segment_size to page size when setting up the request queue.
4469 * For write requests, a TIDAW must not cross track boundaries, because
4470 * we have to set the CBC flag on the last tidaw for each track.
4471 */
4472 if (rq_data_dir(req) == WRITE) {
4473 new_track = 1;
4474 recid = first_rec;
4475 rq_for_each_segment(bv, req, iter) {
4476 dst = page_address(bv.bv_page) + bv.bv_offset;
4477 seg_len = bv.bv_len;
4478 while (seg_len) {
4479 if (new_track) {
4480 trkid = recid;
4481 offs = sector_div(trkid, blk_per_trk);
4482 count_to_trk_end = blk_per_trk - offs;
4483 count = min((last_rec - recid + 1),
4484 (sector_t)count_to_trk_end);
4485 len_to_track_end = count * blksize;
4486 recid += count;
4487 new_track = 0;
4488 }
4489 part_len = min(seg_len, len_to_track_end);
4490 seg_len -= part_len;
4491 len_to_track_end -= part_len;
4492 /* We need to end the tidaw at track end */
4493 if (!len_to_track_end) {
4494 new_track = 1;
4495 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4496 } else
4497 tidaw_flags = 0;
4498 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4499 dst, part_len);
4500 if (IS_ERR(last_tidaw)) {
4501 ret = -EINVAL;
4502 goto out_error;
4503 }
4504 dst += part_len;
4505 }
4506 }
4507 } else {
4508 rq_for_each_segment(bv, req, iter) {
4509 dst = page_address(bv.bv_page) + bv.bv_offset;
4510 last_tidaw = itcw_add_tidaw(itcw, 0x00,
4511 dst, bv.bv_len);
4512 if (IS_ERR(last_tidaw)) {
4513 ret = -EINVAL;
4514 goto out_error;
4515 }
4516 }
4517 }
4518 last_tidaw->flags |= TIDAW_FLAGS_LAST;
4519 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4520 itcw_finalize(itcw);
4521
4522 if (blk_noretry_request(req) ||
4523 block->base->features & DASD_FEATURE_FAILFAST)
4524 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4525 cqr->cpmode = 1;
4526 cqr->startdev = startdev;
4527 cqr->memdev = startdev;
4528 cqr->block = block;
4529 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4530 cqr->lpm = dasd_path_get_ppm(startdev);
4531 cqr->retries = startdev->default_retries;
4532 cqr->buildclk = get_tod_clock();
4533 cqr->status = DASD_CQR_FILLED;
4534
4535 /* Set flags to suppress output for expected errors */
4536 if (dasd_eckd_is_ese(basedev)) {
4537 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4538 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4539 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4540 }
4541
4542 return cqr;
4543 out_error:
4544 dasd_sfree_request(cqr, startdev);
4545 return ERR_PTR(ret);
4546 }
4547
dasd_eckd_build_cp(struct dasd_device * startdev,struct dasd_block * block,struct request * req)4548 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4549 struct dasd_block *block,
4550 struct request *req)
4551 {
4552 int cmdrtd, cmdwtd;
4553 int use_prefix;
4554 int fcx_multitrack;
4555 struct dasd_eckd_private *private;
4556 struct dasd_device *basedev;
4557 sector_t first_rec, last_rec;
4558 sector_t first_trk, last_trk;
4559 unsigned int first_offs, last_offs;
4560 unsigned int blk_per_trk, blksize;
4561 int cdlspecial;
4562 unsigned int data_size;
4563 struct dasd_ccw_req *cqr;
4564
4565 basedev = block->base;
4566 private = basedev->private;
4567
4568 /* Calculate number of blocks/records per track. */
4569 blksize = block->bp_block;
4570 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4571 if (blk_per_trk == 0)
4572 return ERR_PTR(-EINVAL);
4573 /* Calculate record id of first and last block. */
4574 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4575 first_offs = sector_div(first_trk, blk_per_trk);
4576 last_rec = last_trk =
4577 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4578 last_offs = sector_div(last_trk, blk_per_trk);
4579 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4580
4581 fcx_multitrack = private->features.feature[40] & 0x20;
4582 data_size = blk_rq_bytes(req);
4583 if (data_size % blksize)
4584 return ERR_PTR(-EINVAL);
4585 /* tpm write request add CBC data on each track boundary */
4586 if (rq_data_dir(req) == WRITE)
4587 data_size += (last_trk - first_trk) * 4;
4588
4589 /* is read track data and write track data in command mode supported? */
4590 cmdrtd = private->features.feature[9] & 0x20;
4591 cmdwtd = private->features.feature[12] & 0x40;
4592 use_prefix = private->features.feature[8] & 0x01;
4593
4594 cqr = NULL;
4595 if (cdlspecial || dasd_page_cache) {
4596 /* do nothing, just fall through to the cmd mode single case */
4597 } else if ((data_size <= private->fcx_max_data)
4598 && (fcx_multitrack || (first_trk == last_trk))) {
4599 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4600 first_rec, last_rec,
4601 first_trk, last_trk,
4602 first_offs, last_offs,
4603 blk_per_trk, blksize);
4604 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4605 (PTR_ERR(cqr) != -ENOMEM))
4606 cqr = NULL;
4607 } else if (use_prefix &&
4608 (((rq_data_dir(req) == READ) && cmdrtd) ||
4609 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4610 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4611 first_rec, last_rec,
4612 first_trk, last_trk,
4613 first_offs, last_offs,
4614 blk_per_trk, blksize);
4615 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4616 (PTR_ERR(cqr) != -ENOMEM))
4617 cqr = NULL;
4618 }
4619 if (!cqr)
4620 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4621 first_rec, last_rec,
4622 first_trk, last_trk,
4623 first_offs, last_offs,
4624 blk_per_trk, blksize);
4625 return cqr;
4626 }
4627
dasd_eckd_build_cp_raw(struct dasd_device * startdev,struct dasd_block * block,struct request * req)4628 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4629 struct dasd_block *block,
4630 struct request *req)
4631 {
4632 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4633 unsigned int seg_len, len_to_track_end;
4634 unsigned int cidaw, cplength, datasize;
4635 sector_t first_trk, last_trk, sectors;
4636 struct dasd_eckd_private *base_priv;
4637 struct dasd_device *basedev;
4638 struct req_iterator iter;
4639 struct dasd_ccw_req *cqr;
4640 unsigned int trkcount;
4641 unsigned long *idaws;
4642 unsigned int size;
4643 unsigned char cmd;
4644 struct bio_vec bv;
4645 struct ccw1 *ccw;
4646 int use_prefix;
4647 void *data;
4648 char *dst;
4649
4650 /*
4651 * raw track access needs to be mutiple of 64k and on 64k boundary
4652 * For read requests we can fix an incorrect alignment by padding
4653 * the request with dummy pages.
4654 */
4655 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4656 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4657 DASD_RAW_SECTORS_PER_TRACK;
4658 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4659 DASD_RAW_SECTORS_PER_TRACK;
4660 basedev = block->base;
4661 if ((start_padding_sectors || end_padding_sectors) &&
4662 (rq_data_dir(req) == WRITE)) {
4663 DBF_DEV_EVENT(DBF_ERR, basedev,
4664 "raw write not track aligned (%llu,%llu) req %p",
4665 start_padding_sectors, end_padding_sectors, req);
4666 return ERR_PTR(-EINVAL);
4667 }
4668
4669 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4670 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4671 DASD_RAW_SECTORS_PER_TRACK;
4672 trkcount = last_trk - first_trk + 1;
4673
4674 if (rq_data_dir(req) == READ)
4675 cmd = DASD_ECKD_CCW_READ_TRACK;
4676 else if (rq_data_dir(req) == WRITE)
4677 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4678 else
4679 return ERR_PTR(-EINVAL);
4680
4681 /*
4682 * Raw track based I/O needs IDAWs for each page,
4683 * and not just for 64 bit addresses.
4684 */
4685 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4686
4687 /*
4688 * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4689 * of extended parameter. This is needed for write full track.
4690 */
4691 base_priv = basedev->private;
4692 use_prefix = base_priv->features.feature[8] & 0x01;
4693 if (use_prefix) {
4694 cplength = 1 + trkcount;
4695 size = sizeof(struct PFX_eckd_data) + 2;
4696 } else {
4697 cplength = 2 + trkcount;
4698 size = sizeof(struct DE_eckd_data) +
4699 sizeof(struct LRE_eckd_data) + 2;
4700 }
4701 size = ALIGN(size, 8);
4702
4703 datasize = size + cidaw * sizeof(unsigned long);
4704
4705 /* Allocate the ccw request. */
4706 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4707 datasize, startdev, blk_mq_rq_to_pdu(req));
4708 if (IS_ERR(cqr))
4709 return cqr;
4710
4711 ccw = cqr->cpaddr;
4712 data = cqr->data;
4713
4714 if (use_prefix) {
4715 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4716 startdev, 1, 0, trkcount, 0, 0);
4717 } else {
4718 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4719 ccw[-1].flags |= CCW_FLAG_CC;
4720
4721 data += sizeof(struct DE_eckd_data);
4722 locate_record_ext(ccw++, data, first_trk, 0,
4723 trkcount, cmd, basedev, 0, 0);
4724 }
4725
4726 idaws = (unsigned long *)(cqr->data + size);
4727 len_to_track_end = 0;
4728 if (start_padding_sectors) {
4729 ccw[-1].flags |= CCW_FLAG_CC;
4730 ccw->cmd_code = cmd;
4731 /* maximum 3390 track size */
4732 ccw->count = 57326;
4733 /* 64k map to one track */
4734 len_to_track_end = 65536 - start_padding_sectors * 512;
4735 ccw->cda = (__u32)(addr_t)idaws;
4736 ccw->flags |= CCW_FLAG_IDA;
4737 ccw->flags |= CCW_FLAG_SLI;
4738 ccw++;
4739 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4740 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4741 }
4742 rq_for_each_segment(bv, req, iter) {
4743 dst = page_address(bv.bv_page) + bv.bv_offset;
4744 seg_len = bv.bv_len;
4745 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4746 memset(dst, 0, seg_len);
4747 if (!len_to_track_end) {
4748 ccw[-1].flags |= CCW_FLAG_CC;
4749 ccw->cmd_code = cmd;
4750 /* maximum 3390 track size */
4751 ccw->count = 57326;
4752 /* 64k map to one track */
4753 len_to_track_end = 65536;
4754 ccw->cda = (__u32)(addr_t)idaws;
4755 ccw->flags |= CCW_FLAG_IDA;
4756 ccw->flags |= CCW_FLAG_SLI;
4757 ccw++;
4758 }
4759 len_to_track_end -= seg_len;
4760 idaws = idal_create_words(idaws, dst, seg_len);
4761 }
4762 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4763 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4764 if (blk_noretry_request(req) ||
4765 block->base->features & DASD_FEATURE_FAILFAST)
4766 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4767 cqr->startdev = startdev;
4768 cqr->memdev = startdev;
4769 cqr->block = block;
4770 cqr->expires = startdev->default_expires * HZ;
4771 cqr->lpm = dasd_path_get_ppm(startdev);
4772 cqr->retries = startdev->default_retries;
4773 cqr->buildclk = get_tod_clock();
4774 cqr->status = DASD_CQR_FILLED;
4775
4776 return cqr;
4777 }
4778
4779
4780 static int
dasd_eckd_free_cp(struct dasd_ccw_req * cqr,struct request * req)4781 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4782 {
4783 struct dasd_eckd_private *private;
4784 struct ccw1 *ccw;
4785 struct req_iterator iter;
4786 struct bio_vec bv;
4787 char *dst, *cda;
4788 unsigned int blksize, blk_per_trk, off;
4789 sector_t recid;
4790 int status;
4791
4792 if (!dasd_page_cache)
4793 goto out;
4794 private = cqr->block->base->private;
4795 blksize = cqr->block->bp_block;
4796 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4797 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4798 ccw = cqr->cpaddr;
4799 /* Skip over define extent & locate record. */
4800 ccw++;
4801 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4802 ccw++;
4803 rq_for_each_segment(bv, req, iter) {
4804 dst = page_address(bv.bv_page) + bv.bv_offset;
4805 for (off = 0; off < bv.bv_len; off += blksize) {
4806 /* Skip locate record. */
4807 if (private->uses_cdl && recid <= 2*blk_per_trk)
4808 ccw++;
4809 if (dst) {
4810 if (ccw->flags & CCW_FLAG_IDA)
4811 cda = *((char **)((addr_t) ccw->cda));
4812 else
4813 cda = (char *)((addr_t) ccw->cda);
4814 if (dst != cda) {
4815 if (rq_data_dir(req) == READ)
4816 memcpy(dst, cda, bv.bv_len);
4817 kmem_cache_free(dasd_page_cache,
4818 (void *)((addr_t)cda & PAGE_MASK));
4819 }
4820 dst = NULL;
4821 }
4822 ccw++;
4823 recid++;
4824 }
4825 }
4826 out:
4827 status = cqr->status == DASD_CQR_DONE;
4828 dasd_sfree_request(cqr, cqr->memdev);
4829 return status;
4830 }
4831
4832 /*
4833 * Modify ccw/tcw in cqr so it can be started on a base device.
4834 *
4835 * Note that this is not enough to restart the cqr!
4836 * Either reset cqr->startdev as well (summary unit check handling)
4837 * or restart via separate cqr (as in ERP handling).
4838 */
dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req * cqr)4839 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4840 {
4841 struct ccw1 *ccw;
4842 struct PFX_eckd_data *pfxdata;
4843 struct tcw *tcw;
4844 struct tccb *tccb;
4845 struct dcw *dcw;
4846
4847 if (cqr->cpmode == 1) {
4848 tcw = cqr->cpaddr;
4849 tccb = tcw_get_tccb(tcw);
4850 dcw = (struct dcw *)&tccb->tca[0];
4851 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4852 pfxdata->validity.verify_base = 0;
4853 pfxdata->validity.hyper_pav = 0;
4854 } else {
4855 ccw = cqr->cpaddr;
4856 pfxdata = cqr->data;
4857 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4858 pfxdata->validity.verify_base = 0;
4859 pfxdata->validity.hyper_pav = 0;
4860 }
4861 }
4862 }
4863
4864 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4865
dasd_eckd_build_alias_cp(struct dasd_device * base,struct dasd_block * block,struct request * req)4866 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4867 struct dasd_block *block,
4868 struct request *req)
4869 {
4870 struct dasd_eckd_private *private;
4871 struct dasd_device *startdev;
4872 unsigned long flags;
4873 struct dasd_ccw_req *cqr;
4874
4875 startdev = dasd_alias_get_start_dev(base);
4876 if (!startdev)
4877 startdev = base;
4878 private = startdev->private;
4879 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4880 return ERR_PTR(-EBUSY);
4881
4882 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4883 private->count++;
4884 if ((base->features & DASD_FEATURE_USERAW))
4885 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4886 else
4887 cqr = dasd_eckd_build_cp(startdev, block, req);
4888 if (IS_ERR(cqr))
4889 private->count--;
4890 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4891 return cqr;
4892 }
4893
dasd_eckd_free_alias_cp(struct dasd_ccw_req * cqr,struct request * req)4894 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4895 struct request *req)
4896 {
4897 struct dasd_eckd_private *private;
4898 unsigned long flags;
4899
4900 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4901 private = cqr->memdev->private;
4902 private->count--;
4903 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4904 return dasd_eckd_free_cp(cqr, req);
4905 }
4906
4907 static int
dasd_eckd_fill_info(struct dasd_device * device,struct dasd_information2_t * info)4908 dasd_eckd_fill_info(struct dasd_device * device,
4909 struct dasd_information2_t * info)
4910 {
4911 struct dasd_eckd_private *private = device->private;
4912
4913 info->label_block = 2;
4914 info->FBA_layout = private->uses_cdl ? 0 : 1;
4915 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4916 info->characteristics_size = sizeof(private->rdc_data);
4917 memcpy(info->characteristics, &private->rdc_data,
4918 sizeof(private->rdc_data));
4919 info->confdata_size = min((unsigned long)private->conf_len,
4920 sizeof(info->configuration_data));
4921 memcpy(info->configuration_data, private->conf_data,
4922 info->confdata_size);
4923 return 0;
4924 }
4925
4926 /*
4927 * SECTION: ioctl functions for eckd devices.
4928 */
4929
4930 /*
4931 * Release device ioctl.
4932 * Buils a channel programm to releases a prior reserved
4933 * (see dasd_eckd_reserve) device.
4934 */
4935 static int
dasd_eckd_release(struct dasd_device * device)4936 dasd_eckd_release(struct dasd_device *device)
4937 {
4938 struct dasd_ccw_req *cqr;
4939 int rc;
4940 struct ccw1 *ccw;
4941 int useglobal;
4942
4943 if (!capable(CAP_SYS_ADMIN))
4944 return -EACCES;
4945
4946 useglobal = 0;
4947 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4948 if (IS_ERR(cqr)) {
4949 mutex_lock(&dasd_reserve_mutex);
4950 useglobal = 1;
4951 cqr = &dasd_reserve_req->cqr;
4952 memset(cqr, 0, sizeof(*cqr));
4953 memset(&dasd_reserve_req->ccw, 0,
4954 sizeof(dasd_reserve_req->ccw));
4955 cqr->cpaddr = &dasd_reserve_req->ccw;
4956 cqr->data = &dasd_reserve_req->data;
4957 cqr->magic = DASD_ECKD_MAGIC;
4958 }
4959 ccw = cqr->cpaddr;
4960 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4961 ccw->flags |= CCW_FLAG_SLI;
4962 ccw->count = 32;
4963 ccw->cda = (__u32)(addr_t) cqr->data;
4964 cqr->startdev = device;
4965 cqr->memdev = device;
4966 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4967 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4968 cqr->retries = 2; /* set retry counter to enable basic ERP */
4969 cqr->expires = 2 * HZ;
4970 cqr->buildclk = get_tod_clock();
4971 cqr->status = DASD_CQR_FILLED;
4972
4973 rc = dasd_sleep_on_immediatly(cqr);
4974 if (!rc)
4975 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4976
4977 if (useglobal)
4978 mutex_unlock(&dasd_reserve_mutex);
4979 else
4980 dasd_sfree_request(cqr, cqr->memdev);
4981 return rc;
4982 }
4983
4984 /*
4985 * Reserve device ioctl.
4986 * Options are set to 'synchronous wait for interrupt' and
4987 * 'timeout the request'. This leads to a terminate IO if
4988 * the interrupt is outstanding for a certain time.
4989 */
4990 static int
dasd_eckd_reserve(struct dasd_device * device)4991 dasd_eckd_reserve(struct dasd_device *device)
4992 {
4993 struct dasd_ccw_req *cqr;
4994 int rc;
4995 struct ccw1 *ccw;
4996 int useglobal;
4997
4998 if (!capable(CAP_SYS_ADMIN))
4999 return -EACCES;
5000
5001 useglobal = 0;
5002 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5003 if (IS_ERR(cqr)) {
5004 mutex_lock(&dasd_reserve_mutex);
5005 useglobal = 1;
5006 cqr = &dasd_reserve_req->cqr;
5007 memset(cqr, 0, sizeof(*cqr));
5008 memset(&dasd_reserve_req->ccw, 0,
5009 sizeof(dasd_reserve_req->ccw));
5010 cqr->cpaddr = &dasd_reserve_req->ccw;
5011 cqr->data = &dasd_reserve_req->data;
5012 cqr->magic = DASD_ECKD_MAGIC;
5013 }
5014 ccw = cqr->cpaddr;
5015 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5016 ccw->flags |= CCW_FLAG_SLI;
5017 ccw->count = 32;
5018 ccw->cda = (__u32)(addr_t) cqr->data;
5019 cqr->startdev = device;
5020 cqr->memdev = device;
5021 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5022 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5023 cqr->retries = 2; /* set retry counter to enable basic ERP */
5024 cqr->expires = 2 * HZ;
5025 cqr->buildclk = get_tod_clock();
5026 cqr->status = DASD_CQR_FILLED;
5027
5028 rc = dasd_sleep_on_immediatly(cqr);
5029 if (!rc)
5030 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5031
5032 if (useglobal)
5033 mutex_unlock(&dasd_reserve_mutex);
5034 else
5035 dasd_sfree_request(cqr, cqr->memdev);
5036 return rc;
5037 }
5038
5039 /*
5040 * Steal lock ioctl - unconditional reserve device.
5041 * Buils a channel programm to break a device's reservation.
5042 * (unconditional reserve)
5043 */
5044 static int
dasd_eckd_steal_lock(struct dasd_device * device)5045 dasd_eckd_steal_lock(struct dasd_device *device)
5046 {
5047 struct dasd_ccw_req *cqr;
5048 int rc;
5049 struct ccw1 *ccw;
5050 int useglobal;
5051
5052 if (!capable(CAP_SYS_ADMIN))
5053 return -EACCES;
5054
5055 useglobal = 0;
5056 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5057 if (IS_ERR(cqr)) {
5058 mutex_lock(&dasd_reserve_mutex);
5059 useglobal = 1;
5060 cqr = &dasd_reserve_req->cqr;
5061 memset(cqr, 0, sizeof(*cqr));
5062 memset(&dasd_reserve_req->ccw, 0,
5063 sizeof(dasd_reserve_req->ccw));
5064 cqr->cpaddr = &dasd_reserve_req->ccw;
5065 cqr->data = &dasd_reserve_req->data;
5066 cqr->magic = DASD_ECKD_MAGIC;
5067 }
5068 ccw = cqr->cpaddr;
5069 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5070 ccw->flags |= CCW_FLAG_SLI;
5071 ccw->count = 32;
5072 ccw->cda = (__u32)(addr_t) cqr->data;
5073 cqr->startdev = device;
5074 cqr->memdev = device;
5075 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5076 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5077 cqr->retries = 2; /* set retry counter to enable basic ERP */
5078 cqr->expires = 2 * HZ;
5079 cqr->buildclk = get_tod_clock();
5080 cqr->status = DASD_CQR_FILLED;
5081
5082 rc = dasd_sleep_on_immediatly(cqr);
5083 if (!rc)
5084 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5085
5086 if (useglobal)
5087 mutex_unlock(&dasd_reserve_mutex);
5088 else
5089 dasd_sfree_request(cqr, cqr->memdev);
5090 return rc;
5091 }
5092
5093 /*
5094 * SNID - Sense Path Group ID
5095 * This ioctl may be used in situations where I/O is stalled due to
5096 * a reserve, so if the normal dasd_smalloc_request fails, we use the
5097 * preallocated dasd_reserve_req.
5098 */
dasd_eckd_snid(struct dasd_device * device,void __user * argp)5099 static int dasd_eckd_snid(struct dasd_device *device,
5100 void __user *argp)
5101 {
5102 struct dasd_ccw_req *cqr;
5103 int rc;
5104 struct ccw1 *ccw;
5105 int useglobal;
5106 struct dasd_snid_ioctl_data usrparm;
5107
5108 if (!capable(CAP_SYS_ADMIN))
5109 return -EACCES;
5110
5111 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5112 return -EFAULT;
5113
5114 useglobal = 0;
5115 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5116 sizeof(struct dasd_snid_data), device,
5117 NULL);
5118 if (IS_ERR(cqr)) {
5119 mutex_lock(&dasd_reserve_mutex);
5120 useglobal = 1;
5121 cqr = &dasd_reserve_req->cqr;
5122 memset(cqr, 0, sizeof(*cqr));
5123 memset(&dasd_reserve_req->ccw, 0,
5124 sizeof(dasd_reserve_req->ccw));
5125 cqr->cpaddr = &dasd_reserve_req->ccw;
5126 cqr->data = &dasd_reserve_req->data;
5127 cqr->magic = DASD_ECKD_MAGIC;
5128 }
5129 ccw = cqr->cpaddr;
5130 ccw->cmd_code = DASD_ECKD_CCW_SNID;
5131 ccw->flags |= CCW_FLAG_SLI;
5132 ccw->count = 12;
5133 ccw->cda = (__u32)(addr_t) cqr->data;
5134 cqr->startdev = device;
5135 cqr->memdev = device;
5136 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5137 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5138 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5139 cqr->retries = 5;
5140 cqr->expires = 10 * HZ;
5141 cqr->buildclk = get_tod_clock();
5142 cqr->status = DASD_CQR_FILLED;
5143 cqr->lpm = usrparm.path_mask;
5144
5145 rc = dasd_sleep_on_immediatly(cqr);
5146 /* verify that I/O processing didn't modify the path mask */
5147 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5148 rc = -EIO;
5149 if (!rc) {
5150 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5151 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5152 rc = -EFAULT;
5153 }
5154
5155 if (useglobal)
5156 mutex_unlock(&dasd_reserve_mutex);
5157 else
5158 dasd_sfree_request(cqr, cqr->memdev);
5159 return rc;
5160 }
5161
5162 /*
5163 * Read performance statistics
5164 */
5165 static int
dasd_eckd_performance(struct dasd_device * device,void __user * argp)5166 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5167 {
5168 struct dasd_psf_prssd_data *prssdp;
5169 struct dasd_rssd_perf_stats_t *stats;
5170 struct dasd_ccw_req *cqr;
5171 struct ccw1 *ccw;
5172 int rc;
5173
5174 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5175 (sizeof(struct dasd_psf_prssd_data) +
5176 sizeof(struct dasd_rssd_perf_stats_t)),
5177 device, NULL);
5178 if (IS_ERR(cqr)) {
5179 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5180 "Could not allocate initialization request");
5181 return PTR_ERR(cqr);
5182 }
5183 cqr->startdev = device;
5184 cqr->memdev = device;
5185 cqr->retries = 0;
5186 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5187 cqr->expires = 10 * HZ;
5188
5189 /* Prepare for Read Subsystem Data */
5190 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5191 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5192 prssdp->order = PSF_ORDER_PRSSD;
5193 prssdp->suborder = 0x01; /* Performance Statistics */
5194 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
5195
5196 ccw = cqr->cpaddr;
5197 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5198 ccw->count = sizeof(struct dasd_psf_prssd_data);
5199 ccw->flags |= CCW_FLAG_CC;
5200 ccw->cda = (__u32)(addr_t) prssdp;
5201
5202 /* Read Subsystem Data - Performance Statistics */
5203 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5204 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5205
5206 ccw++;
5207 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5208 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5209 ccw->cda = (__u32)(addr_t) stats;
5210
5211 cqr->buildclk = get_tod_clock();
5212 cqr->status = DASD_CQR_FILLED;
5213 rc = dasd_sleep_on(cqr);
5214 if (rc == 0) {
5215 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5216 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5217 if (copy_to_user(argp, stats,
5218 sizeof(struct dasd_rssd_perf_stats_t)))
5219 rc = -EFAULT;
5220 }
5221 dasd_sfree_request(cqr, cqr->memdev);
5222 return rc;
5223 }
5224
5225 /*
5226 * Get attributes (cache operations)
5227 * Returnes the cache attributes used in Define Extend (DE).
5228 */
5229 static int
dasd_eckd_get_attrib(struct dasd_device * device,void __user * argp)5230 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5231 {
5232 struct dasd_eckd_private *private = device->private;
5233 struct attrib_data_t attrib = private->attrib;
5234 int rc;
5235
5236 if (!capable(CAP_SYS_ADMIN))
5237 return -EACCES;
5238 if (!argp)
5239 return -EINVAL;
5240
5241 rc = 0;
5242 if (copy_to_user(argp, (long *) &attrib,
5243 sizeof(struct attrib_data_t)))
5244 rc = -EFAULT;
5245
5246 return rc;
5247 }
5248
5249 /*
5250 * Set attributes (cache operations)
5251 * Stores the attributes for cache operation to be used in Define Extend (DE).
5252 */
5253 static int
dasd_eckd_set_attrib(struct dasd_device * device,void __user * argp)5254 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5255 {
5256 struct dasd_eckd_private *private = device->private;
5257 struct attrib_data_t attrib;
5258
5259 if (!capable(CAP_SYS_ADMIN))
5260 return -EACCES;
5261 if (!argp)
5262 return -EINVAL;
5263
5264 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5265 return -EFAULT;
5266 private->attrib = attrib;
5267
5268 dev_info(&device->cdev->dev,
5269 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5270 private->attrib.operation, private->attrib.nr_cyl);
5271 return 0;
5272 }
5273
5274 /*
5275 * Issue syscall I/O to EMC Symmetrix array.
5276 * CCWs are PSF and RSSD
5277 */
dasd_symm_io(struct dasd_device * device,void __user * argp)5278 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5279 {
5280 struct dasd_symmio_parms usrparm;
5281 char *psf_data, *rssd_result;
5282 struct dasd_ccw_req *cqr;
5283 struct ccw1 *ccw;
5284 char psf0, psf1;
5285 int rc;
5286
5287 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5288 return -EACCES;
5289 psf0 = psf1 = 0;
5290
5291 /* Copy parms from caller */
5292 rc = -EFAULT;
5293 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5294 goto out;
5295 if (is_compat_task()) {
5296 /* Make sure pointers are sane even on 31 bit. */
5297 rc = -EINVAL;
5298 if ((usrparm.psf_data >> 32) != 0)
5299 goto out;
5300 if ((usrparm.rssd_result >> 32) != 0)
5301 goto out;
5302 usrparm.psf_data &= 0x7fffffffULL;
5303 usrparm.rssd_result &= 0x7fffffffULL;
5304 }
5305 /* at least 2 bytes are accessed and should be allocated */
5306 if (usrparm.psf_data_len < 2) {
5307 DBF_DEV_EVENT(DBF_WARNING, device,
5308 "Symmetrix ioctl invalid data length %d",
5309 usrparm.psf_data_len);
5310 rc = -EINVAL;
5311 goto out;
5312 }
5313 /* alloc I/O data area */
5314 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5315 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5316 if (!psf_data || !rssd_result) {
5317 rc = -ENOMEM;
5318 goto out_free;
5319 }
5320
5321 /* get syscall header from user space */
5322 rc = -EFAULT;
5323 if (copy_from_user(psf_data,
5324 (void __user *)(unsigned long) usrparm.psf_data,
5325 usrparm.psf_data_len))
5326 goto out_free;
5327 psf0 = psf_data[0];
5328 psf1 = psf_data[1];
5329
5330 /* setup CCWs for PSF + RSSD */
5331 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5332 if (IS_ERR(cqr)) {
5333 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5334 "Could not allocate initialization request");
5335 rc = PTR_ERR(cqr);
5336 goto out_free;
5337 }
5338
5339 cqr->startdev = device;
5340 cqr->memdev = device;
5341 cqr->retries = 3;
5342 cqr->expires = 10 * HZ;
5343 cqr->buildclk = get_tod_clock();
5344 cqr->status = DASD_CQR_FILLED;
5345
5346 /* Build the ccws */
5347 ccw = cqr->cpaddr;
5348
5349 /* PSF ccw */
5350 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5351 ccw->count = usrparm.psf_data_len;
5352 ccw->flags |= CCW_FLAG_CC;
5353 ccw->cda = (__u32)(addr_t) psf_data;
5354
5355 ccw++;
5356
5357 /* RSSD ccw */
5358 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5359 ccw->count = usrparm.rssd_result_len;
5360 ccw->flags = CCW_FLAG_SLI ;
5361 ccw->cda = (__u32)(addr_t) rssd_result;
5362
5363 rc = dasd_sleep_on(cqr);
5364 if (rc)
5365 goto out_sfree;
5366
5367 rc = -EFAULT;
5368 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5369 rssd_result, usrparm.rssd_result_len))
5370 goto out_sfree;
5371 rc = 0;
5372
5373 out_sfree:
5374 dasd_sfree_request(cqr, cqr->memdev);
5375 out_free:
5376 kfree(rssd_result);
5377 kfree(psf_data);
5378 out:
5379 DBF_DEV_EVENT(DBF_WARNING, device,
5380 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5381 (int) psf0, (int) psf1, rc);
5382 return rc;
5383 }
5384
5385 static int
dasd_eckd_ioctl(struct dasd_block * block,unsigned int cmd,void __user * argp)5386 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5387 {
5388 struct dasd_device *device = block->base;
5389
5390 switch (cmd) {
5391 case BIODASDGATTR:
5392 return dasd_eckd_get_attrib(device, argp);
5393 case BIODASDSATTR:
5394 return dasd_eckd_set_attrib(device, argp);
5395 case BIODASDPSRD:
5396 return dasd_eckd_performance(device, argp);
5397 case BIODASDRLSE:
5398 return dasd_eckd_release(device);
5399 case BIODASDRSRV:
5400 return dasd_eckd_reserve(device);
5401 case BIODASDSLCK:
5402 return dasd_eckd_steal_lock(device);
5403 case BIODASDSNID:
5404 return dasd_eckd_snid(device, argp);
5405 case BIODASDSYMMIO:
5406 return dasd_symm_io(device, argp);
5407 default:
5408 return -ENOTTY;
5409 }
5410 }
5411
5412 /*
5413 * Dump the range of CCWs into 'page' buffer
5414 * and return number of printed chars.
5415 */
5416 static int
dasd_eckd_dump_ccw_range(struct ccw1 * from,struct ccw1 * to,char * page)5417 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5418 {
5419 int len, count;
5420 char *datap;
5421
5422 len = 0;
5423 while (from <= to) {
5424 len += sprintf(page + len, PRINTK_HEADER
5425 " CCW %p: %08X %08X DAT:",
5426 from, ((int *) from)[0], ((int *) from)[1]);
5427
5428 /* get pointer to data (consider IDALs) */
5429 if (from->flags & CCW_FLAG_IDA)
5430 datap = (char *) *((addr_t *) (addr_t) from->cda);
5431 else
5432 datap = (char *) ((addr_t) from->cda);
5433
5434 /* dump data (max 32 bytes) */
5435 for (count = 0; count < from->count && count < 32; count++) {
5436 if (count % 8 == 0) len += sprintf(page + len, " ");
5437 if (count % 4 == 0) len += sprintf(page + len, " ");
5438 len += sprintf(page + len, "%02x", datap[count]);
5439 }
5440 len += sprintf(page + len, "\n");
5441 from++;
5442 }
5443 return len;
5444 }
5445
5446 static void
dasd_eckd_dump_sense_dbf(struct dasd_device * device,struct irb * irb,char * reason)5447 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5448 char *reason)
5449 {
5450 u64 *sense;
5451 u64 *stat;
5452
5453 sense = (u64 *) dasd_get_sense(irb);
5454 stat = (u64 *) &irb->scsw;
5455 if (sense) {
5456 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5457 "%016llx %016llx %016llx %016llx",
5458 reason, *stat, *((u32 *) (stat + 1)),
5459 sense[0], sense[1], sense[2], sense[3]);
5460 } else {
5461 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5462 reason, *stat, *((u32 *) (stat + 1)),
5463 "NO VALID SENSE");
5464 }
5465 }
5466
5467 /*
5468 * Print sense data and related channel program.
5469 * Parts are printed because printk buffer is only 1024 bytes.
5470 */
dasd_eckd_dump_sense_ccw(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5471 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5472 struct dasd_ccw_req *req, struct irb *irb)
5473 {
5474 char *page;
5475 struct ccw1 *first, *last, *fail, *from, *to;
5476 int len, sl, sct;
5477
5478 page = (char *) get_zeroed_page(GFP_ATOMIC);
5479 if (page == NULL) {
5480 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5481 "No memory to dump sense data\n");
5482 return;
5483 }
5484 /* dump the sense data */
5485 len = sprintf(page, PRINTK_HEADER
5486 " I/O status report for device %s:\n",
5487 dev_name(&device->cdev->dev));
5488 len += sprintf(page + len, PRINTK_HEADER
5489 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5490 "CS:%02X RC:%d\n",
5491 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5492 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5493 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5494 req ? req->intrc : 0);
5495 len += sprintf(page + len, PRINTK_HEADER
5496 " device %s: Failing CCW: %p\n",
5497 dev_name(&device->cdev->dev),
5498 (void *) (addr_t) irb->scsw.cmd.cpa);
5499 if (irb->esw.esw0.erw.cons) {
5500 for (sl = 0; sl < 4; sl++) {
5501 len += sprintf(page + len, PRINTK_HEADER
5502 " Sense(hex) %2d-%2d:",
5503 (8 * sl), ((8 * sl) + 7));
5504
5505 for (sct = 0; sct < 8; sct++) {
5506 len += sprintf(page + len, " %02x",
5507 irb->ecw[8 * sl + sct]);
5508 }
5509 len += sprintf(page + len, "\n");
5510 }
5511
5512 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5513 /* 24 Byte Sense Data */
5514 sprintf(page + len, PRINTK_HEADER
5515 " 24 Byte: %x MSG %x, "
5516 "%s MSGb to SYSOP\n",
5517 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5518 irb->ecw[1] & 0x10 ? "" : "no");
5519 } else {
5520 /* 32 Byte Sense Data */
5521 sprintf(page + len, PRINTK_HEADER
5522 " 32 Byte: Format: %x "
5523 "Exception class %x\n",
5524 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5525 }
5526 } else {
5527 sprintf(page + len, PRINTK_HEADER
5528 " SORRY - NO VALID SENSE AVAILABLE\n");
5529 }
5530 printk(KERN_ERR "%s", page);
5531
5532 if (req) {
5533 /* req == NULL for unsolicited interrupts */
5534 /* dump the Channel Program (max 140 Bytes per line) */
5535 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
5536 first = req->cpaddr;
5537 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5538 to = min(first + 6, last);
5539 len = sprintf(page, PRINTK_HEADER
5540 " Related CP in req: %p\n", req);
5541 dasd_eckd_dump_ccw_range(first, to, page + len);
5542 printk(KERN_ERR "%s", page);
5543
5544 /* print failing CCW area (maximum 4) */
5545 /* scsw->cda is either valid or zero */
5546 len = 0;
5547 from = ++to;
5548 fail = (struct ccw1 *)(addr_t)
5549 irb->scsw.cmd.cpa; /* failing CCW */
5550 if (from < fail - 2) {
5551 from = fail - 2; /* there is a gap - print header */
5552 len += sprintf(page, PRINTK_HEADER "......\n");
5553 }
5554 to = min(fail + 1, last);
5555 len += dasd_eckd_dump_ccw_range(from, to, page + len);
5556
5557 /* print last CCWs (maximum 2) */
5558 from = max(from, ++to);
5559 if (from < last - 1) {
5560 from = last - 1; /* there is a gap - print header */
5561 len += sprintf(page + len, PRINTK_HEADER "......\n");
5562 }
5563 len += dasd_eckd_dump_ccw_range(from, last, page + len);
5564 if (len > 0)
5565 printk(KERN_ERR "%s", page);
5566 }
5567 free_page((unsigned long) page);
5568 }
5569
5570
5571 /*
5572 * Print sense data from a tcw.
5573 */
dasd_eckd_dump_sense_tcw(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5574 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5575 struct dasd_ccw_req *req, struct irb *irb)
5576 {
5577 char *page;
5578 int len, sl, sct, residual;
5579 struct tsb *tsb;
5580 u8 *sense, *rcq;
5581
5582 page = (char *) get_zeroed_page(GFP_ATOMIC);
5583 if (page == NULL) {
5584 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5585 "No memory to dump sense data");
5586 return;
5587 }
5588 /* dump the sense data */
5589 len = sprintf(page, PRINTK_HEADER
5590 " I/O status report for device %s:\n",
5591 dev_name(&device->cdev->dev));
5592 len += sprintf(page + len, PRINTK_HEADER
5593 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5594 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5595 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5596 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5597 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5598 irb->scsw.tm.fcxs,
5599 (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5600 req ? req->intrc : 0);
5601 len += sprintf(page + len, PRINTK_HEADER
5602 " device %s: Failing TCW: %p\n",
5603 dev_name(&device->cdev->dev),
5604 (void *) (addr_t) irb->scsw.tm.tcw);
5605
5606 tsb = NULL;
5607 sense = NULL;
5608 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5609 tsb = tcw_get_tsb(
5610 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
5611
5612 if (tsb) {
5613 len += sprintf(page + len, PRINTK_HEADER
5614 " tsb->length %d\n", tsb->length);
5615 len += sprintf(page + len, PRINTK_HEADER
5616 " tsb->flags %x\n", tsb->flags);
5617 len += sprintf(page + len, PRINTK_HEADER
5618 " tsb->dcw_offset %d\n", tsb->dcw_offset);
5619 len += sprintf(page + len, PRINTK_HEADER
5620 " tsb->count %d\n", tsb->count);
5621 residual = tsb->count - 28;
5622 len += sprintf(page + len, PRINTK_HEADER
5623 " residual %d\n", residual);
5624
5625 switch (tsb->flags & 0x07) {
5626 case 1: /* tsa_iostat */
5627 len += sprintf(page + len, PRINTK_HEADER
5628 " tsb->tsa.iostat.dev_time %d\n",
5629 tsb->tsa.iostat.dev_time);
5630 len += sprintf(page + len, PRINTK_HEADER
5631 " tsb->tsa.iostat.def_time %d\n",
5632 tsb->tsa.iostat.def_time);
5633 len += sprintf(page + len, PRINTK_HEADER
5634 " tsb->tsa.iostat.queue_time %d\n",
5635 tsb->tsa.iostat.queue_time);
5636 len += sprintf(page + len, PRINTK_HEADER
5637 " tsb->tsa.iostat.dev_busy_time %d\n",
5638 tsb->tsa.iostat.dev_busy_time);
5639 len += sprintf(page + len, PRINTK_HEADER
5640 " tsb->tsa.iostat.dev_act_time %d\n",
5641 tsb->tsa.iostat.dev_act_time);
5642 sense = tsb->tsa.iostat.sense;
5643 break;
5644 case 2: /* ts_ddpc */
5645 len += sprintf(page + len, PRINTK_HEADER
5646 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5647 for (sl = 0; sl < 2; sl++) {
5648 len += sprintf(page + len, PRINTK_HEADER
5649 " tsb->tsa.ddpc.rcq %2d-%2d: ",
5650 (8 * sl), ((8 * sl) + 7));
5651 rcq = tsb->tsa.ddpc.rcq;
5652 for (sct = 0; sct < 8; sct++) {
5653 len += sprintf(page + len, " %02x",
5654 rcq[8 * sl + sct]);
5655 }
5656 len += sprintf(page + len, "\n");
5657 }
5658 sense = tsb->tsa.ddpc.sense;
5659 break;
5660 case 3: /* tsa_intrg */
5661 len += sprintf(page + len, PRINTK_HEADER
5662 " tsb->tsa.intrg.: not supported yet\n");
5663 break;
5664 }
5665
5666 if (sense) {
5667 for (sl = 0; sl < 4; sl++) {
5668 len += sprintf(page + len, PRINTK_HEADER
5669 " Sense(hex) %2d-%2d:",
5670 (8 * sl), ((8 * sl) + 7));
5671 for (sct = 0; sct < 8; sct++) {
5672 len += sprintf(page + len, " %02x",
5673 sense[8 * sl + sct]);
5674 }
5675 len += sprintf(page + len, "\n");
5676 }
5677
5678 if (sense[27] & DASD_SENSE_BIT_0) {
5679 /* 24 Byte Sense Data */
5680 sprintf(page + len, PRINTK_HEADER
5681 " 24 Byte: %x MSG %x, "
5682 "%s MSGb to SYSOP\n",
5683 sense[7] >> 4, sense[7] & 0x0f,
5684 sense[1] & 0x10 ? "" : "no");
5685 } else {
5686 /* 32 Byte Sense Data */
5687 sprintf(page + len, PRINTK_HEADER
5688 " 32 Byte: Format: %x "
5689 "Exception class %x\n",
5690 sense[6] & 0x0f, sense[22] >> 4);
5691 }
5692 } else {
5693 sprintf(page + len, PRINTK_HEADER
5694 " SORRY - NO VALID SENSE AVAILABLE\n");
5695 }
5696 } else {
5697 sprintf(page + len, PRINTK_HEADER
5698 " SORRY - NO TSB DATA AVAILABLE\n");
5699 }
5700 printk(KERN_ERR "%s", page);
5701 free_page((unsigned long) page);
5702 }
5703
dasd_eckd_dump_sense(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5704 static void dasd_eckd_dump_sense(struct dasd_device *device,
5705 struct dasd_ccw_req *req, struct irb *irb)
5706 {
5707 u8 *sense = dasd_get_sense(irb);
5708
5709 if (scsw_is_tm(&irb->scsw)) {
5710 /*
5711 * In some cases the 'File Protected' or 'Incorrect Length'
5712 * error might be expected and log messages shouldn't be written
5713 * then. Check if the according suppress bit is set.
5714 */
5715 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5716 test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5717 return;
5718 if (scsw_cstat(&irb->scsw) == 0x40 &&
5719 test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5720 return;
5721
5722 dasd_eckd_dump_sense_tcw(device, req, irb);
5723 } else {
5724 /*
5725 * In some cases the 'Command Reject' or 'No Record Found'
5726 * error might be expected and log messages shouldn't be
5727 * written then. Check if the according suppress bit is set.
5728 */
5729 if (sense && sense[0] & SNS0_CMD_REJECT &&
5730 test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5731 return;
5732
5733 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5734 test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5735 return;
5736
5737 dasd_eckd_dump_sense_ccw(device, req, irb);
5738 }
5739 }
5740
dasd_eckd_pm_freeze(struct dasd_device * device)5741 static int dasd_eckd_pm_freeze(struct dasd_device *device)
5742 {
5743 /*
5744 * the device should be disconnected from our LCU structure
5745 * on restore we will reconnect it and reread LCU specific
5746 * information like PAV support that might have changed
5747 */
5748 dasd_alias_remove_device(device);
5749 dasd_alias_disconnect_device_from_lcu(device);
5750
5751 return 0;
5752 }
5753
dasd_eckd_restore_device(struct dasd_device * device)5754 static int dasd_eckd_restore_device(struct dasd_device *device)
5755 {
5756 struct dasd_eckd_private *private = device->private;
5757 struct dasd_eckd_characteristics temp_rdc_data;
5758 int rc;
5759 struct dasd_uid temp_uid;
5760 unsigned long flags;
5761 unsigned long cqr_flags = 0;
5762
5763 /* Read Configuration Data */
5764 rc = dasd_eckd_read_conf(device);
5765 if (rc) {
5766 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5767 "Read configuration data failed, rc=%d", rc);
5768 goto out_err;
5769 }
5770
5771 dasd_eckd_get_uid(device, &temp_uid);
5772 /* Generate device unique id */
5773 rc = dasd_eckd_generate_uid(device);
5774 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5775 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
5776 dev_err(&device->cdev->dev, "The UID of the DASD has "
5777 "changed\n");
5778 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5779 if (rc)
5780 goto out_err;
5781
5782 /* register lcu with alias handling, enable PAV if this is a new lcu */
5783 rc = dasd_alias_make_device_known_to_lcu(device);
5784 if (rc)
5785 goto out_err;
5786
5787 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
5788 dasd_eckd_validate_server(device, cqr_flags);
5789
5790 /* RE-Read Configuration Data */
5791 rc = dasd_eckd_read_conf(device);
5792 if (rc) {
5793 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5794 "Read configuration data failed, rc=%d", rc);
5795 goto out_err2;
5796 }
5797
5798 /* Read Feature Codes */
5799 dasd_eckd_read_features(device);
5800
5801 /* Read Volume Information */
5802 dasd_eckd_read_vol_info(device);
5803
5804 /* Read Extent Pool Information */
5805 dasd_eckd_read_ext_pool_info(device);
5806
5807 /* Read Device Characteristics */
5808 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
5809 &temp_rdc_data, 64);
5810 if (rc) {
5811 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5812 "Read device characteristic failed, rc=%d", rc);
5813 goto out_err2;
5814 }
5815 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5816 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
5817 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5818
5819 /* add device to alias management */
5820 dasd_alias_add_device(device);
5821
5822 return 0;
5823
5824 out_err2:
5825 dasd_alias_disconnect_device_from_lcu(device);
5826 out_err:
5827 return -1;
5828 }
5829
dasd_eckd_reload_device(struct dasd_device * device)5830 static int dasd_eckd_reload_device(struct dasd_device *device)
5831 {
5832 struct dasd_eckd_private *private = device->private;
5833 int rc, old_base;
5834 char print_uid[60];
5835 struct dasd_uid uid;
5836 unsigned long flags;
5837
5838 /*
5839 * remove device from alias handling to prevent new requests
5840 * from being scheduled on the wrong alias device
5841 */
5842 dasd_alias_remove_device(device);
5843
5844 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5845 old_base = private->uid.base_unit_addr;
5846 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5847
5848 /* Read Configuration Data */
5849 rc = dasd_eckd_read_conf(device);
5850 if (rc)
5851 goto out_err;
5852
5853 rc = dasd_eckd_generate_uid(device);
5854 if (rc)
5855 goto out_err;
5856 /*
5857 * update unit address configuration and
5858 * add device to alias management
5859 */
5860 dasd_alias_update_add_device(device);
5861
5862 dasd_eckd_get_uid(device, &uid);
5863
5864 if (old_base != uid.base_unit_addr) {
5865 if (strlen(uid.vduit) > 0)
5866 snprintf(print_uid, sizeof(print_uid),
5867 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5868 uid.ssid, uid.base_unit_addr, uid.vduit);
5869 else
5870 snprintf(print_uid, sizeof(print_uid),
5871 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5872 uid.ssid, uid.base_unit_addr);
5873
5874 dev_info(&device->cdev->dev,
5875 "An Alias device was reassigned to a new base device "
5876 "with UID: %s\n", print_uid);
5877 }
5878 return 0;
5879
5880 out_err:
5881 return -1;
5882 }
5883
dasd_eckd_read_message_buffer(struct dasd_device * device,struct dasd_rssd_messages * messages,__u8 lpum)5884 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5885 struct dasd_rssd_messages *messages,
5886 __u8 lpum)
5887 {
5888 struct dasd_rssd_messages *message_buf;
5889 struct dasd_psf_prssd_data *prssdp;
5890 struct dasd_ccw_req *cqr;
5891 struct ccw1 *ccw;
5892 int rc;
5893
5894 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5895 (sizeof(struct dasd_psf_prssd_data) +
5896 sizeof(struct dasd_rssd_messages)),
5897 device, NULL);
5898 if (IS_ERR(cqr)) {
5899 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5900 "Could not allocate read message buffer request");
5901 return PTR_ERR(cqr);
5902 }
5903
5904 cqr->lpm = lpum;
5905 retry:
5906 cqr->startdev = device;
5907 cqr->memdev = device;
5908 cqr->block = NULL;
5909 cqr->expires = 10 * HZ;
5910 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5911 /* dasd_sleep_on_immediatly does not do complex error
5912 * recovery so clear erp flag and set retry counter to
5913 * do basic erp */
5914 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5915 cqr->retries = 256;
5916
5917 /* Prepare for Read Subsystem Data */
5918 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5919 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5920 prssdp->order = PSF_ORDER_PRSSD;
5921 prssdp->suborder = 0x03; /* Message Buffer */
5922 /* all other bytes of prssdp must be zero */
5923
5924 ccw = cqr->cpaddr;
5925 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5926 ccw->count = sizeof(struct dasd_psf_prssd_data);
5927 ccw->flags |= CCW_FLAG_CC;
5928 ccw->flags |= CCW_FLAG_SLI;
5929 ccw->cda = (__u32)(addr_t) prssdp;
5930
5931 /* Read Subsystem Data - message buffer */
5932 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5933 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5934
5935 ccw++;
5936 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5937 ccw->count = sizeof(struct dasd_rssd_messages);
5938 ccw->flags |= CCW_FLAG_SLI;
5939 ccw->cda = (__u32)(addr_t) message_buf;
5940
5941 cqr->buildclk = get_tod_clock();
5942 cqr->status = DASD_CQR_FILLED;
5943 rc = dasd_sleep_on_immediatly(cqr);
5944 if (rc == 0) {
5945 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5946 message_buf = (struct dasd_rssd_messages *)
5947 (prssdp + 1);
5948 memcpy(messages, message_buf,
5949 sizeof(struct dasd_rssd_messages));
5950 } else if (cqr->lpm) {
5951 /*
5952 * on z/VM we might not be able to do I/O on the requested path
5953 * but instead we get the required information on any path
5954 * so retry with open path mask
5955 */
5956 cqr->lpm = 0;
5957 goto retry;
5958 } else
5959 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5960 "Reading messages failed with rc=%d\n"
5961 , rc);
5962 dasd_sfree_request(cqr, cqr->memdev);
5963 return rc;
5964 }
5965
dasd_eckd_query_host_access(struct dasd_device * device,struct dasd_psf_query_host_access * data)5966 static int dasd_eckd_query_host_access(struct dasd_device *device,
5967 struct dasd_psf_query_host_access *data)
5968 {
5969 struct dasd_eckd_private *private = device->private;
5970 struct dasd_psf_query_host_access *host_access;
5971 struct dasd_psf_prssd_data *prssdp;
5972 struct dasd_ccw_req *cqr;
5973 struct ccw1 *ccw;
5974 int rc;
5975
5976 /* not available for HYPER PAV alias devices */
5977 if (!device->block && private->lcu->pav == HYPER_PAV)
5978 return -EOPNOTSUPP;
5979
5980 /* may not be supported by the storage server */
5981 if (!(private->features.feature[14] & 0x80))
5982 return -EOPNOTSUPP;
5983
5984 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5985 sizeof(struct dasd_psf_prssd_data) + 1,
5986 device, NULL);
5987 if (IS_ERR(cqr)) {
5988 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5989 "Could not allocate read message buffer request");
5990 return PTR_ERR(cqr);
5991 }
5992 host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5993 if (!host_access) {
5994 dasd_sfree_request(cqr, device);
5995 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5996 "Could not allocate host_access buffer");
5997 return -ENOMEM;
5998 }
5999 cqr->startdev = device;
6000 cqr->memdev = device;
6001 cqr->block = NULL;
6002 cqr->retries = 256;
6003 cqr->expires = 10 * HZ;
6004
6005 /* Prepare for Read Subsystem Data */
6006 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
6007 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
6008 prssdp->order = PSF_ORDER_PRSSD;
6009 prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */
6010 /* LSS and Volume that will be queried */
6011 prssdp->lss = private->ned->ID;
6012 prssdp->volume = private->ned->unit_addr;
6013 /* all other bytes of prssdp must be zero */
6014
6015 ccw = cqr->cpaddr;
6016 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6017 ccw->count = sizeof(struct dasd_psf_prssd_data);
6018 ccw->flags |= CCW_FLAG_CC;
6019 ccw->flags |= CCW_FLAG_SLI;
6020 ccw->cda = (__u32)(addr_t) prssdp;
6021
6022 /* Read Subsystem Data - query host access */
6023 ccw++;
6024 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6025 ccw->count = sizeof(struct dasd_psf_query_host_access);
6026 ccw->flags |= CCW_FLAG_SLI;
6027 ccw->cda = (__u32)(addr_t) host_access;
6028
6029 cqr->buildclk = get_tod_clock();
6030 cqr->status = DASD_CQR_FILLED;
6031 /* the command might not be supported, suppress error message */
6032 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
6033 rc = dasd_sleep_on_interruptible(cqr);
6034 if (rc == 0) {
6035 *data = *host_access;
6036 } else {
6037 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6038 "Reading host access data failed with rc=%d\n",
6039 rc);
6040 rc = -EOPNOTSUPP;
6041 }
6042
6043 dasd_sfree_request(cqr, cqr->memdev);
6044 kfree(host_access);
6045 return rc;
6046 }
6047 /*
6048 * return number of grouped devices
6049 */
dasd_eckd_host_access_count(struct dasd_device * device)6050 static int dasd_eckd_host_access_count(struct dasd_device *device)
6051 {
6052 struct dasd_psf_query_host_access *access;
6053 struct dasd_ckd_path_group_entry *entry;
6054 struct dasd_ckd_host_information *info;
6055 int count = 0;
6056 int rc, i;
6057
6058 access = kzalloc(sizeof(*access), GFP_NOIO);
6059 if (!access) {
6060 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6061 "Could not allocate access buffer");
6062 return -ENOMEM;
6063 }
6064 rc = dasd_eckd_query_host_access(device, access);
6065 if (rc) {
6066 kfree(access);
6067 return rc;
6068 }
6069
6070 info = (struct dasd_ckd_host_information *)
6071 access->host_access_information;
6072 for (i = 0; i < info->entry_count; i++) {
6073 entry = (struct dasd_ckd_path_group_entry *)
6074 (info->entry + i * info->entry_size);
6075 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6076 count++;
6077 }
6078
6079 kfree(access);
6080 return count;
6081 }
6082
6083 /*
6084 * write host access information to a sequential file
6085 */
dasd_hosts_print(struct dasd_device * device,struct seq_file * m)6086 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6087 {
6088 struct dasd_psf_query_host_access *access;
6089 struct dasd_ckd_path_group_entry *entry;
6090 struct dasd_ckd_host_information *info;
6091 char sysplex[9] = "";
6092 int rc, i;
6093
6094 access = kzalloc(sizeof(*access), GFP_NOIO);
6095 if (!access) {
6096 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6097 "Could not allocate access buffer");
6098 return -ENOMEM;
6099 }
6100 rc = dasd_eckd_query_host_access(device, access);
6101 if (rc) {
6102 kfree(access);
6103 return rc;
6104 }
6105
6106 info = (struct dasd_ckd_host_information *)
6107 access->host_access_information;
6108 for (i = 0; i < info->entry_count; i++) {
6109 entry = (struct dasd_ckd_path_group_entry *)
6110 (info->entry + i * info->entry_size);
6111 /* PGID */
6112 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6113 /* FLAGS */
6114 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6115 /* SYSPLEX NAME */
6116 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6117 EBCASC(sysplex, sizeof(sysplex));
6118 seq_printf(m, "sysplex_name %8s\n", sysplex);
6119 /* SUPPORTED CYLINDER */
6120 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6121 /* TIMESTAMP */
6122 seq_printf(m, "timestamp %lu\n", (unsigned long)
6123 entry->timestamp);
6124 }
6125 kfree(access);
6126
6127 return 0;
6128 }
6129
6130 /*
6131 * Perform Subsystem Function - CUIR response
6132 */
6133 static int
dasd_eckd_psf_cuir_response(struct dasd_device * device,int response,__u32 message_id,__u8 lpum)6134 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6135 __u32 message_id, __u8 lpum)
6136 {
6137 struct dasd_psf_cuir_response *psf_cuir;
6138 int pos = pathmask_to_pos(lpum);
6139 struct dasd_ccw_req *cqr;
6140 struct ccw1 *ccw;
6141 int rc;
6142
6143 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6144 sizeof(struct dasd_psf_cuir_response),
6145 device, NULL);
6146
6147 if (IS_ERR(cqr)) {
6148 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6149 "Could not allocate PSF-CUIR request");
6150 return PTR_ERR(cqr);
6151 }
6152
6153 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6154 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6155 psf_cuir->cc = response;
6156 psf_cuir->chpid = device->path[pos].chpid;
6157 psf_cuir->message_id = message_id;
6158 psf_cuir->cssid = device->path[pos].cssid;
6159 psf_cuir->ssid = device->path[pos].ssid;
6160 ccw = cqr->cpaddr;
6161 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6162 ccw->cda = (__u32)(addr_t)psf_cuir;
6163 ccw->flags = CCW_FLAG_SLI;
6164 ccw->count = sizeof(struct dasd_psf_cuir_response);
6165
6166 cqr->startdev = device;
6167 cqr->memdev = device;
6168 cqr->block = NULL;
6169 cqr->retries = 256;
6170 cqr->expires = 10*HZ;
6171 cqr->buildclk = get_tod_clock();
6172 cqr->status = DASD_CQR_FILLED;
6173 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6174
6175 rc = dasd_sleep_on(cqr);
6176
6177 dasd_sfree_request(cqr, cqr->memdev);
6178 return rc;
6179 }
6180
6181 /*
6182 * return configuration data that is referenced by record selector
6183 * if a record selector is specified or per default return the
6184 * conf_data pointer for the path specified by lpum
6185 */
dasd_eckd_get_ref_conf(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6186 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6187 __u8 lpum,
6188 struct dasd_cuir_message *cuir)
6189 {
6190 struct dasd_conf_data *conf_data;
6191 int path, pos;
6192
6193 if (cuir->record_selector == 0)
6194 goto out;
6195 for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6196 conf_data = device->path[pos].conf_data;
6197 if (conf_data->gneq.record_selector ==
6198 cuir->record_selector)
6199 return conf_data;
6200 }
6201 out:
6202 return device->path[pathmask_to_pos(lpum)].conf_data;
6203 }
6204
6205 /*
6206 * This function determines the scope of a reconfiguration request by
6207 * analysing the path and device selection data provided in the CUIR request.
6208 * Returns a path mask containing CUIR affected paths for the give device.
6209 *
6210 * If the CUIR request does not contain the required information return the
6211 * path mask of the path the attention message for the CUIR request was reveived
6212 * on.
6213 */
dasd_eckd_cuir_scope(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6214 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6215 struct dasd_cuir_message *cuir)
6216 {
6217 struct dasd_conf_data *ref_conf_data;
6218 unsigned long bitmask = 0, mask = 0;
6219 struct dasd_conf_data *conf_data;
6220 unsigned int pos, path;
6221 char *ref_gneq, *gneq;
6222 char *ref_ned, *ned;
6223 int tbcpm = 0;
6224
6225 /* if CUIR request does not specify the scope use the path
6226 the attention message was presented on */
6227 if (!cuir->ned_map ||
6228 !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6229 return lpum;
6230
6231 /* get reference conf data */
6232 ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6233 /* reference ned is determined by ned_map field */
6234 pos = 8 - ffs(cuir->ned_map);
6235 ref_ned = (char *)&ref_conf_data->neds[pos];
6236 ref_gneq = (char *)&ref_conf_data->gneq;
6237 /* transfer 24 bit neq_map to mask */
6238 mask = cuir->neq_map[2];
6239 mask |= cuir->neq_map[1] << 8;
6240 mask |= cuir->neq_map[0] << 16;
6241
6242 for (path = 0; path < 8; path++) {
6243 /* initialise data per path */
6244 bitmask = mask;
6245 conf_data = device->path[path].conf_data;
6246 pos = 8 - ffs(cuir->ned_map);
6247 ned = (char *) &conf_data->neds[pos];
6248 /* compare reference ned and per path ned */
6249 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6250 continue;
6251 gneq = (char *)&conf_data->gneq;
6252 /* compare reference gneq and per_path gneq under
6253 24 bit mask where mask bit 0 equals byte 7 of
6254 the gneq and mask bit 24 equals byte 31 */
6255 while (bitmask) {
6256 pos = ffs(bitmask) - 1;
6257 if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6258 != 0)
6259 break;
6260 clear_bit(pos, &bitmask);
6261 }
6262 if (bitmask)
6263 continue;
6264 /* device and path match the reference values
6265 add path to CUIR scope */
6266 tbcpm |= 0x80 >> path;
6267 }
6268 return tbcpm;
6269 }
6270
dasd_eckd_cuir_notify_user(struct dasd_device * device,unsigned long paths,int action)6271 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6272 unsigned long paths, int action)
6273 {
6274 int pos;
6275
6276 while (paths) {
6277 /* get position of bit in mask */
6278 pos = 8 - ffs(paths);
6279 /* get channel path descriptor from this position */
6280 if (action == CUIR_QUIESCE)
6281 pr_warn("Service on the storage server caused path %x.%02x to go offline",
6282 device->path[pos].cssid,
6283 device->path[pos].chpid);
6284 else if (action == CUIR_RESUME)
6285 pr_info("Path %x.%02x is back online after service on the storage server",
6286 device->path[pos].cssid,
6287 device->path[pos].chpid);
6288 clear_bit(7 - pos, &paths);
6289 }
6290 }
6291
dasd_eckd_cuir_remove_path(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6292 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6293 struct dasd_cuir_message *cuir)
6294 {
6295 unsigned long tbcpm;
6296
6297 tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6298 /* nothing to do if path is not in use */
6299 if (!(dasd_path_get_opm(device) & tbcpm))
6300 return 0;
6301 if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6302 /* no path would be left if the CUIR action is taken
6303 return error */
6304 return -EINVAL;
6305 }
6306 /* remove device from operational path mask */
6307 dasd_path_remove_opm(device, tbcpm);
6308 dasd_path_add_cuirpm(device, tbcpm);
6309 return tbcpm;
6310 }
6311
6312 /*
6313 * walk through all devices and build a path mask to quiesce them
6314 * return an error if the last path to a device would be removed
6315 *
6316 * if only part of the devices are quiesced and an error
6317 * occurs no onlining necessary, the storage server will
6318 * notify the already set offline devices again
6319 */
dasd_eckd_cuir_quiesce(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6320 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6321 struct dasd_cuir_message *cuir)
6322 {
6323 struct dasd_eckd_private *private = device->private;
6324 struct alias_pav_group *pavgroup, *tempgroup;
6325 struct dasd_device *dev, *n;
6326 unsigned long paths = 0;
6327 unsigned long flags;
6328 int tbcpm;
6329
6330 /* active devices */
6331 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6332 alias_list) {
6333 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6334 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6335 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6336 if (tbcpm < 0)
6337 goto out_err;
6338 paths |= tbcpm;
6339 }
6340 /* inactive devices */
6341 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6342 alias_list) {
6343 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6344 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6345 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6346 if (tbcpm < 0)
6347 goto out_err;
6348 paths |= tbcpm;
6349 }
6350 /* devices in PAV groups */
6351 list_for_each_entry_safe(pavgroup, tempgroup,
6352 &private->lcu->grouplist, group) {
6353 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6354 alias_list) {
6355 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6356 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6357 spin_unlock_irqrestore(
6358 get_ccwdev_lock(dev->cdev), flags);
6359 if (tbcpm < 0)
6360 goto out_err;
6361 paths |= tbcpm;
6362 }
6363 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6364 alias_list) {
6365 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6366 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6367 spin_unlock_irqrestore(
6368 get_ccwdev_lock(dev->cdev), flags);
6369 if (tbcpm < 0)
6370 goto out_err;
6371 paths |= tbcpm;
6372 }
6373 }
6374 /* notify user about all paths affected by CUIR action */
6375 dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6376 return 0;
6377 out_err:
6378 return tbcpm;
6379 }
6380
dasd_eckd_cuir_resume(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6381 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6382 struct dasd_cuir_message *cuir)
6383 {
6384 struct dasd_eckd_private *private = device->private;
6385 struct alias_pav_group *pavgroup, *tempgroup;
6386 struct dasd_device *dev, *n;
6387 unsigned long paths = 0;
6388 int tbcpm;
6389
6390 /*
6391 * the path may have been added through a generic path event before
6392 * only trigger path verification if the path is not already in use
6393 */
6394 list_for_each_entry_safe(dev, n,
6395 &private->lcu->active_devices,
6396 alias_list) {
6397 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6398 paths |= tbcpm;
6399 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6400 dasd_path_add_tbvpm(dev, tbcpm);
6401 dasd_schedule_device_bh(dev);
6402 }
6403 }
6404 list_for_each_entry_safe(dev, n,
6405 &private->lcu->inactive_devices,
6406 alias_list) {
6407 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6408 paths |= tbcpm;
6409 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6410 dasd_path_add_tbvpm(dev, tbcpm);
6411 dasd_schedule_device_bh(dev);
6412 }
6413 }
6414 /* devices in PAV groups */
6415 list_for_each_entry_safe(pavgroup, tempgroup,
6416 &private->lcu->grouplist,
6417 group) {
6418 list_for_each_entry_safe(dev, n,
6419 &pavgroup->baselist,
6420 alias_list) {
6421 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6422 paths |= tbcpm;
6423 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6424 dasd_path_add_tbvpm(dev, tbcpm);
6425 dasd_schedule_device_bh(dev);
6426 }
6427 }
6428 list_for_each_entry_safe(dev, n,
6429 &pavgroup->aliaslist,
6430 alias_list) {
6431 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6432 paths |= tbcpm;
6433 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6434 dasd_path_add_tbvpm(dev, tbcpm);
6435 dasd_schedule_device_bh(dev);
6436 }
6437 }
6438 }
6439 /* notify user about all paths affected by CUIR action */
6440 dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6441 return 0;
6442 }
6443
dasd_eckd_handle_cuir(struct dasd_device * device,void * messages,__u8 lpum)6444 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6445 __u8 lpum)
6446 {
6447 struct dasd_cuir_message *cuir = messages;
6448 int response;
6449
6450 DBF_DEV_EVENT(DBF_WARNING, device,
6451 "CUIR request: %016llx %016llx %016llx %08x",
6452 ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6453 ((u32 *)cuir)[3]);
6454
6455 if (cuir->code == CUIR_QUIESCE) {
6456 /* quiesce */
6457 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6458 response = PSF_CUIR_LAST_PATH;
6459 else
6460 response = PSF_CUIR_COMPLETED;
6461 } else if (cuir->code == CUIR_RESUME) {
6462 /* resume */
6463 dasd_eckd_cuir_resume(device, lpum, cuir);
6464 response = PSF_CUIR_COMPLETED;
6465 } else
6466 response = PSF_CUIR_NOT_SUPPORTED;
6467
6468 dasd_eckd_psf_cuir_response(device, response,
6469 cuir->message_id, lpum);
6470 DBF_DEV_EVENT(DBF_WARNING, device,
6471 "CUIR response: %d on message ID %08x", response,
6472 cuir->message_id);
6473 /* to make sure there is no attention left schedule work again */
6474 device->discipline->check_attention(device, lpum);
6475 }
6476
dasd_eckd_oos_resume(struct dasd_device * device)6477 static void dasd_eckd_oos_resume(struct dasd_device *device)
6478 {
6479 struct dasd_eckd_private *private = device->private;
6480 struct alias_pav_group *pavgroup, *tempgroup;
6481 struct dasd_device *dev, *n;
6482 unsigned long flags;
6483
6484 spin_lock_irqsave(&private->lcu->lock, flags);
6485 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6486 alias_list) {
6487 if (dev->stopped & DASD_STOPPED_NOSPC)
6488 dasd_generic_space_avail(dev);
6489 }
6490 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6491 alias_list) {
6492 if (dev->stopped & DASD_STOPPED_NOSPC)
6493 dasd_generic_space_avail(dev);
6494 }
6495 /* devices in PAV groups */
6496 list_for_each_entry_safe(pavgroup, tempgroup,
6497 &private->lcu->grouplist,
6498 group) {
6499 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6500 alias_list) {
6501 if (dev->stopped & DASD_STOPPED_NOSPC)
6502 dasd_generic_space_avail(dev);
6503 }
6504 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6505 alias_list) {
6506 if (dev->stopped & DASD_STOPPED_NOSPC)
6507 dasd_generic_space_avail(dev);
6508 }
6509 }
6510 spin_unlock_irqrestore(&private->lcu->lock, flags);
6511 }
6512
dasd_eckd_handle_oos(struct dasd_device * device,void * messages,__u8 lpum)6513 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6514 __u8 lpum)
6515 {
6516 struct dasd_oos_message *oos = messages;
6517
6518 switch (oos->code) {
6519 case REPO_WARN:
6520 case POOL_WARN:
6521 dev_warn(&device->cdev->dev,
6522 "Extent pool usage has reached a critical value\n");
6523 dasd_eckd_oos_resume(device);
6524 break;
6525 case REPO_EXHAUST:
6526 case POOL_EXHAUST:
6527 dev_warn(&device->cdev->dev,
6528 "Extent pool is exhausted\n");
6529 break;
6530 case REPO_RELIEVE:
6531 case POOL_RELIEVE:
6532 dev_info(&device->cdev->dev,
6533 "Extent pool physical space constraint has been relieved\n");
6534 break;
6535 }
6536
6537 /* In any case, update related data */
6538 dasd_eckd_read_ext_pool_info(device);
6539
6540 /* to make sure there is no attention left schedule work again */
6541 device->discipline->check_attention(device, lpum);
6542 }
6543
dasd_eckd_check_attention_work(struct work_struct * work)6544 static void dasd_eckd_check_attention_work(struct work_struct *work)
6545 {
6546 struct check_attention_work_data *data;
6547 struct dasd_rssd_messages *messages;
6548 struct dasd_device *device;
6549 int rc;
6550
6551 data = container_of(work, struct check_attention_work_data, worker);
6552 device = data->device;
6553 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6554 if (!messages) {
6555 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6556 "Could not allocate attention message buffer");
6557 goto out;
6558 }
6559 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6560 if (rc)
6561 goto out;
6562
6563 if (messages->length == ATTENTION_LENGTH_CUIR &&
6564 messages->format == ATTENTION_FORMAT_CUIR)
6565 dasd_eckd_handle_cuir(device, messages, data->lpum);
6566 if (messages->length == ATTENTION_LENGTH_OOS &&
6567 messages->format == ATTENTION_FORMAT_OOS)
6568 dasd_eckd_handle_oos(device, messages, data->lpum);
6569
6570 out:
6571 dasd_put_device(device);
6572 kfree(messages);
6573 kfree(data);
6574 }
6575
dasd_eckd_check_attention(struct dasd_device * device,__u8 lpum)6576 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6577 {
6578 struct check_attention_work_data *data;
6579
6580 data = kzalloc(sizeof(*data), GFP_ATOMIC);
6581 if (!data)
6582 return -ENOMEM;
6583 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6584 dasd_get_device(device);
6585 data->device = device;
6586 data->lpum = lpum;
6587 schedule_work(&data->worker);
6588 return 0;
6589 }
6590
dasd_eckd_disable_hpf_path(struct dasd_device * device,__u8 lpum)6591 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6592 {
6593 if (~lpum & dasd_path_get_opm(device)) {
6594 dasd_path_add_nohpfpm(device, lpum);
6595 dasd_path_remove_opm(device, lpum);
6596 dev_err(&device->cdev->dev,
6597 "Channel path %02X lost HPF functionality and is disabled\n",
6598 lpum);
6599 return 1;
6600 }
6601 return 0;
6602 }
6603
dasd_eckd_disable_hpf_device(struct dasd_device * device)6604 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6605 {
6606 struct dasd_eckd_private *private = device->private;
6607
6608 dev_err(&device->cdev->dev,
6609 "High Performance FICON disabled\n");
6610 private->fcx_max_data = 0;
6611 }
6612
dasd_eckd_hpf_enabled(struct dasd_device * device)6613 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6614 {
6615 struct dasd_eckd_private *private = device->private;
6616
6617 return private->fcx_max_data ? 1 : 0;
6618 }
6619
dasd_eckd_handle_hpf_error(struct dasd_device * device,struct irb * irb)6620 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6621 struct irb *irb)
6622 {
6623 struct dasd_eckd_private *private = device->private;
6624
6625 if (!private->fcx_max_data) {
6626 /* sanity check for no HPF, the error makes no sense */
6627 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6628 "Trying to disable HPF for a non HPF device");
6629 return;
6630 }
6631 if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6632 dasd_eckd_disable_hpf_device(device);
6633 } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6634 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6635 return;
6636 dasd_eckd_disable_hpf_device(device);
6637 dasd_path_set_tbvpm(device,
6638 dasd_path_get_hpfpm(device));
6639 }
6640 /*
6641 * prevent that any new I/O ist started on the device and schedule a
6642 * requeue of existing requests
6643 */
6644 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6645 dasd_schedule_requeue(device);
6646 }
6647
6648 /*
6649 * Initialize block layer request queue.
6650 */
dasd_eckd_setup_blk_queue(struct dasd_block * block)6651 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6652 {
6653 unsigned int logical_block_size = block->bp_block;
6654 struct request_queue *q = block->request_queue;
6655 struct dasd_device *device = block->base;
6656 int max;
6657
6658 if (device->features & DASD_FEATURE_USERAW) {
6659 /*
6660 * the max_blocks value for raw_track access is 256
6661 * it is higher than the native ECKD value because we
6662 * only need one ccw per track
6663 * so the max_hw_sectors are
6664 * 2048 x 512B = 1024kB = 16 tracks
6665 */
6666 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6667 } else {
6668 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6669 }
6670 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6671 q->limits.max_dev_sectors = max;
6672 blk_queue_logical_block_size(q, logical_block_size);
6673 blk_queue_max_hw_sectors(q, max);
6674 blk_queue_max_segments(q, USHRT_MAX);
6675 /* With page sized segments each segment can be translated into one idaw/tidaw */
6676 blk_queue_max_segment_size(q, PAGE_SIZE);
6677 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6678 }
6679
6680 static struct ccw_driver dasd_eckd_driver = {
6681 .driver = {
6682 .name = "dasd-eckd",
6683 .owner = THIS_MODULE,
6684 },
6685 .ids = dasd_eckd_ids,
6686 .probe = dasd_eckd_probe,
6687 .remove = dasd_generic_remove,
6688 .set_offline = dasd_generic_set_offline,
6689 .set_online = dasd_eckd_set_online,
6690 .notify = dasd_generic_notify,
6691 .path_event = dasd_generic_path_event,
6692 .shutdown = dasd_generic_shutdown,
6693 .freeze = dasd_generic_pm_freeze,
6694 .thaw = dasd_generic_restore_device,
6695 .restore = dasd_generic_restore_device,
6696 .uc_handler = dasd_generic_uc_handler,
6697 .int_class = IRQIO_DAS,
6698 };
6699
6700 static struct dasd_discipline dasd_eckd_discipline = {
6701 .owner = THIS_MODULE,
6702 .name = "ECKD",
6703 .ebcname = "ECKD",
6704 .check_device = dasd_eckd_check_characteristics,
6705 .uncheck_device = dasd_eckd_uncheck_device,
6706 .do_analysis = dasd_eckd_do_analysis,
6707 .pe_handler = dasd_eckd_pe_handler,
6708 .basic_to_ready = dasd_eckd_basic_to_ready,
6709 .online_to_ready = dasd_eckd_online_to_ready,
6710 .basic_to_known = dasd_eckd_basic_to_known,
6711 .setup_blk_queue = dasd_eckd_setup_blk_queue,
6712 .fill_geometry = dasd_eckd_fill_geometry,
6713 .start_IO = dasd_start_IO,
6714 .term_IO = dasd_term_IO,
6715 .handle_terminated_request = dasd_eckd_handle_terminated_request,
6716 .format_device = dasd_eckd_format_device,
6717 .check_device_format = dasd_eckd_check_device_format,
6718 .erp_action = dasd_eckd_erp_action,
6719 .erp_postaction = dasd_eckd_erp_postaction,
6720 .check_for_device_change = dasd_eckd_check_for_device_change,
6721 .build_cp = dasd_eckd_build_alias_cp,
6722 .free_cp = dasd_eckd_free_alias_cp,
6723 .dump_sense = dasd_eckd_dump_sense,
6724 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6725 .fill_info = dasd_eckd_fill_info,
6726 .ioctl = dasd_eckd_ioctl,
6727 .freeze = dasd_eckd_pm_freeze,
6728 .restore = dasd_eckd_restore_device,
6729 .reload = dasd_eckd_reload_device,
6730 .get_uid = dasd_eckd_get_uid,
6731 .kick_validate = dasd_eckd_kick_validate_server,
6732 .check_attention = dasd_eckd_check_attention,
6733 .host_access_count = dasd_eckd_host_access_count,
6734 .hosts_print = dasd_hosts_print,
6735 .handle_hpf_error = dasd_eckd_handle_hpf_error,
6736 .disable_hpf = dasd_eckd_disable_hpf_device,
6737 .hpf_enabled = dasd_eckd_hpf_enabled,
6738 .reset_path = dasd_eckd_reset_path,
6739 .is_ese = dasd_eckd_is_ese,
6740 .space_allocated = dasd_eckd_space_allocated,
6741 .space_configured = dasd_eckd_space_configured,
6742 .logical_capacity = dasd_eckd_logical_capacity,
6743 .release_space = dasd_eckd_release_space,
6744 .ext_pool_id = dasd_eckd_ext_pool_id,
6745 .ext_size = dasd_eckd_ext_size,
6746 .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6747 .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6748 .ext_pool_oos = dasd_eckd_ext_pool_oos,
6749 .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6750 .ese_format = dasd_eckd_ese_format,
6751 .ese_read = dasd_eckd_ese_read,
6752 };
6753
6754 static int __init
dasd_eckd_init(void)6755 dasd_eckd_init(void)
6756 {
6757 int ret;
6758
6759 ASCEBC(dasd_eckd_discipline.ebcname, 4);
6760 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6761 GFP_KERNEL | GFP_DMA);
6762 if (!dasd_reserve_req)
6763 return -ENOMEM;
6764 dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6765 GFP_KERNEL | GFP_DMA);
6766 if (!dasd_vol_info_req) {
6767 kfree(dasd_reserve_req);
6768 return -ENOMEM;
6769 }
6770 pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6771 GFP_KERNEL | GFP_DMA);
6772 if (!pe_handler_worker) {
6773 kfree(dasd_reserve_req);
6774 kfree(dasd_vol_info_req);
6775 return -ENOMEM;
6776 }
6777 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6778 if (!rawpadpage) {
6779 kfree(pe_handler_worker);
6780 kfree(dasd_reserve_req);
6781 kfree(dasd_vol_info_req);
6782 return -ENOMEM;
6783 }
6784 ret = ccw_driver_register(&dasd_eckd_driver);
6785 if (!ret)
6786 wait_for_device_probe();
6787 else {
6788 kfree(pe_handler_worker);
6789 kfree(dasd_reserve_req);
6790 kfree(dasd_vol_info_req);
6791 free_page((unsigned long)rawpadpage);
6792 }
6793 return ret;
6794 }
6795
6796 static void __exit
dasd_eckd_cleanup(void)6797 dasd_eckd_cleanup(void)
6798 {
6799 ccw_driver_unregister(&dasd_eckd_driver);
6800 kfree(pe_handler_worker);
6801 kfree(dasd_reserve_req);
6802 free_page((unsigned long)rawpadpage);
6803 }
6804
6805 module_init(dasd_eckd_init);
6806 module_exit(dasd_eckd_cleanup);
6807