1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * S/390 common I/O routines -- channel subsystem call
4 *
5 * Copyright IBM Corp. 1999,2012
6 * Author(s): Ingo Adlung (adlung@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Arnd Bergmann (arndb@de.ibm.com)
9 */
10
11 #define KMSG_COMPONENT "cio"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18 #include <linux/mutex.h>
19 #include <linux/pci.h>
20
21 #include <asm/cio.h>
22 #include <asm/chpid.h>
23 #include <asm/chsc.h>
24 #include <asm/crw.h>
25 #include <asm/isc.h>
26 #include <asm/ebcdic.h>
27 #include <asm/ap.h>
28
29 #include "css.h"
30 #include "cio.h"
31 #include "cio_debug.h"
32 #include "ioasm.h"
33 #include "chp.h"
34 #include "chsc.h"
35
36 static void *sei_page;
37 static void *chsc_page;
38 static DEFINE_SPINLOCK(chsc_page_lock);
39
40 #define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */
41 #define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */
42
43 /**
44 * chsc_error_from_response() - convert a chsc response to an error
45 * @response: chsc response code
46 *
47 * Returns an appropriate Linux error code for @response.
48 */
chsc_error_from_response(int response)49 int chsc_error_from_response(int response)
50 {
51 switch (response) {
52 case 0x0001:
53 return 0;
54 case 0x0002:
55 case 0x0003:
56 case 0x0006:
57 case 0x0007:
58 case 0x0008:
59 case 0x000a:
60 case 0x0104:
61 return -EINVAL;
62 case 0x0004:
63 case 0x0106: /* "Wrong Channel Parm" for the op 0x003d */
64 return -EOPNOTSUPP;
65 case 0x000b:
66 case 0x0107: /* "Channel busy" for the op 0x003d */
67 return -EBUSY;
68 case 0x0100:
69 case 0x0102:
70 return -ENOMEM;
71 case 0x0108: /* "HW limit exceeded" for the op 0x003d */
72 return -EUSERS;
73 default:
74 return -EIO;
75 }
76 }
77 EXPORT_SYMBOL_GPL(chsc_error_from_response);
78
79 struct chsc_ssd_area {
80 struct chsc_header request;
81 u16 :10;
82 u16 ssid:2;
83 u16 :4;
84 u16 f_sch; /* first subchannel */
85 u16 :16;
86 u16 l_sch; /* last subchannel */
87 u32 :32;
88 struct chsc_header response;
89 u32 :32;
90 u8 sch_valid : 1;
91 u8 dev_valid : 1;
92 u8 st : 3; /* subchannel type */
93 u8 zeroes : 3;
94 u8 unit_addr; /* unit address */
95 u16 devno; /* device number */
96 u8 path_mask;
97 u8 fla_valid_mask;
98 u16 sch; /* subchannel */
99 u8 chpid[8]; /* chpids 0-7 */
100 u16 fla[8]; /* full link addresses 0-7 */
101 } __packed __aligned(PAGE_SIZE);
102
chsc_get_ssd_info(struct subchannel_id schid,struct chsc_ssd_info * ssd)103 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
104 {
105 struct chsc_ssd_area *ssd_area;
106 unsigned long flags;
107 int ccode;
108 int ret;
109 int i;
110 int mask;
111
112 spin_lock_irqsave(&chsc_page_lock, flags);
113 memset(chsc_page, 0, PAGE_SIZE);
114 ssd_area = chsc_page;
115 ssd_area->request.length = 0x0010;
116 ssd_area->request.code = 0x0004;
117 ssd_area->ssid = schid.ssid;
118 ssd_area->f_sch = schid.sch_no;
119 ssd_area->l_sch = schid.sch_no;
120
121 ccode = chsc(ssd_area);
122 /* Check response. */
123 if (ccode > 0) {
124 ret = (ccode == 3) ? -ENODEV : -EBUSY;
125 goto out;
126 }
127 ret = chsc_error_from_response(ssd_area->response.code);
128 if (ret != 0) {
129 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
130 schid.ssid, schid.sch_no,
131 ssd_area->response.code);
132 goto out;
133 }
134 if (!ssd_area->sch_valid) {
135 ret = -ENODEV;
136 goto out;
137 }
138 /* Copy data */
139 ret = 0;
140 memset(ssd, 0, sizeof(struct chsc_ssd_info));
141 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
142 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
143 goto out;
144 ssd->path_mask = ssd_area->path_mask;
145 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
146 for (i = 0; i < 8; i++) {
147 mask = 0x80 >> i;
148 if (ssd_area->path_mask & mask) {
149 chp_id_init(&ssd->chpid[i]);
150 ssd->chpid[i].id = ssd_area->chpid[i];
151 }
152 if (ssd_area->fla_valid_mask & mask)
153 ssd->fla[i] = ssd_area->fla[i];
154 }
155 out:
156 spin_unlock_irqrestore(&chsc_page_lock, flags);
157 return ret;
158 }
159
160 /**
161 * chsc_ssqd() - store subchannel QDIO data (SSQD)
162 * @schid: id of the subchannel on which SSQD is performed
163 * @ssqd: request and response block for SSQD
164 *
165 * Returns 0 on success.
166 */
chsc_ssqd(struct subchannel_id schid,struct chsc_ssqd_area * ssqd)167 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
168 {
169 memset(ssqd, 0, sizeof(*ssqd));
170 ssqd->request.length = 0x0010;
171 ssqd->request.code = 0x0024;
172 ssqd->first_sch = schid.sch_no;
173 ssqd->last_sch = schid.sch_no;
174 ssqd->ssid = schid.ssid;
175
176 if (chsc(ssqd))
177 return -EIO;
178
179 return chsc_error_from_response(ssqd->response.code);
180 }
181 EXPORT_SYMBOL_GPL(chsc_ssqd);
182
183 /**
184 * chsc_sadc() - set adapter device controls (SADC)
185 * @schid: id of the subchannel on which SADC is performed
186 * @scssc: request and response block for SADC
187 * @summary_indicator_addr: summary indicator address
188 * @subchannel_indicator_addr: subchannel indicator address
189 * @isc: Interruption Subclass for this subchannel
190 *
191 * Returns 0 on success.
192 */
chsc_sadc(struct subchannel_id schid,struct chsc_scssc_area * scssc,u64 summary_indicator_addr,u64 subchannel_indicator_addr,u8 isc)193 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
194 u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
195 {
196 memset(scssc, 0, sizeof(*scssc));
197 scssc->request.length = 0x0fe0;
198 scssc->request.code = 0x0021;
199 scssc->operation_code = 0;
200
201 scssc->summary_indicator_addr = summary_indicator_addr;
202 scssc->subchannel_indicator_addr = subchannel_indicator_addr;
203
204 scssc->ks = PAGE_DEFAULT_KEY >> 4;
205 scssc->kc = PAGE_DEFAULT_KEY >> 4;
206 scssc->isc = isc;
207 scssc->schid = schid;
208
209 /* enable the time delay disablement facility */
210 if (css_general_characteristics.aif_tdd)
211 scssc->word_with_d_bit = 0x10000000;
212
213 if (chsc(scssc))
214 return -EIO;
215
216 return chsc_error_from_response(scssc->response.code);
217 }
218 EXPORT_SYMBOL_GPL(chsc_sadc);
219
s390_subchannel_remove_chpid(struct subchannel * sch,void * data)220 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
221 {
222 spin_lock_irq(sch->lock);
223 if (sch->driver && sch->driver->chp_event)
224 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
225 goto out_unreg;
226 spin_unlock_irq(sch->lock);
227 return 0;
228
229 out_unreg:
230 sch->lpm = 0;
231 spin_unlock_irq(sch->lock);
232 css_schedule_eval(sch->schid);
233 return 0;
234 }
235
chsc_chp_offline(struct chp_id chpid)236 void chsc_chp_offline(struct chp_id chpid)
237 {
238 struct channel_path *chp = chpid_to_chp(chpid);
239 struct chp_link link;
240 char dbf_txt[15];
241
242 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
243 CIO_TRACE_EVENT(2, dbf_txt);
244
245 if (chp_get_status(chpid) <= 0)
246 return;
247 memset(&link, 0, sizeof(struct chp_link));
248 link.chpid = chpid;
249 /* Wait until previous actions have settled. */
250 css_wait_for_slow_path();
251
252 mutex_lock(&chp->lock);
253 chp_update_desc(chp);
254 mutex_unlock(&chp->lock);
255
256 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
257 }
258
__s390_process_res_acc(struct subchannel * sch,void * data)259 static int __s390_process_res_acc(struct subchannel *sch, void *data)
260 {
261 spin_lock_irq(sch->lock);
262 if (sch->driver && sch->driver->chp_event)
263 sch->driver->chp_event(sch, data, CHP_ONLINE);
264 spin_unlock_irq(sch->lock);
265
266 return 0;
267 }
268
s390_process_res_acc(struct chp_link * link)269 static void s390_process_res_acc(struct chp_link *link)
270 {
271 char dbf_txt[15];
272
273 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
274 link->chpid.id);
275 CIO_TRACE_EVENT( 2, dbf_txt);
276 if (link->fla != 0) {
277 sprintf(dbf_txt, "fla%x", link->fla);
278 CIO_TRACE_EVENT( 2, dbf_txt);
279 }
280 /* Wait until previous actions have settled. */
281 css_wait_for_slow_path();
282 /*
283 * I/O resources may have become accessible.
284 * Scan through all subchannels that may be concerned and
285 * do a validation on those.
286 * The more information we have (info), the less scanning
287 * will we have to do.
288 */
289 for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
290 css_schedule_reprobe();
291 }
292
process_fces_event(struct subchannel * sch,void * data)293 static int process_fces_event(struct subchannel *sch, void *data)
294 {
295 spin_lock_irq(sch->lock);
296 if (sch->driver && sch->driver->chp_event)
297 sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
298 spin_unlock_irq(sch->lock);
299 return 0;
300 }
301
302 struct chsc_sei_nt0_area {
303 u8 flags;
304 u8 vf; /* validity flags */
305 u8 rs; /* reporting source */
306 u8 cc; /* content code */
307 u16 fla; /* full link address */
308 u16 rsid; /* reporting source id */
309 u32 reserved1;
310 u32 reserved2;
311 /* ccdf has to be big enough for a link-incident record */
312 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
313 } __packed;
314
315 struct chsc_sei_nt2_area {
316 u8 flags; /* p and v bit */
317 u8 reserved1;
318 u8 reserved2;
319 u8 cc; /* content code */
320 u32 reserved3[13];
321 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
322 } __packed;
323
324 #define CHSC_SEI_NT0 (1ULL << 63)
325 #define CHSC_SEI_NT2 (1ULL << 61)
326
327 struct chsc_sei {
328 struct chsc_header request;
329 u32 reserved1;
330 u64 ntsm; /* notification type mask */
331 struct chsc_header response;
332 u32 :24;
333 u8 nt;
334 union {
335 struct chsc_sei_nt0_area nt0_area;
336 struct chsc_sei_nt2_area nt2_area;
337 u8 nt_area[PAGE_SIZE - 24];
338 } u;
339 } __packed __aligned(PAGE_SIZE);
340
341 /*
342 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
343 */
344
345 #define LIR_IQ_CLASS_INFO 0
346 #define LIR_IQ_CLASS_DEGRADED 1
347 #define LIR_IQ_CLASS_NOT_OPERATIONAL 2
348
349 struct lir {
350 struct {
351 u32 null:1;
352 u32 reserved:3;
353 u32 class:2;
354 u32 reserved2:2;
355 } __packed iq;
356 u32 ic:8;
357 u32 reserved:16;
358 struct node_descriptor incident_node;
359 struct node_descriptor attached_node;
360 u8 reserved2[32];
361 } __packed;
362
363 #define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */
364 #define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
365
366 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
store_ebcdic(char * dest,const char * src,unsigned long len,char delim)367 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
368 char delim)
369 {
370 memcpy(dest, src, len);
371 EBCASC(dest, len);
372
373 if (delim)
374 dest[len++] = delim;
375
376 return dest + len;
377 }
378
chsc_link_from_sei(struct chp_link * link,struct chsc_sei_nt0_area * sei_area)379 static void chsc_link_from_sei(struct chp_link *link,
380 struct chsc_sei_nt0_area *sei_area)
381 {
382 if ((sei_area->vf & SEI_VF_FLA) != 0) {
383 link->fla = sei_area->fla;
384 link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
385 0xffff : 0xff00;
386 }
387 }
388
389 /* Format node ID and parameters for output in LIR log message. */
format_node_data(char * params,char * id,struct node_descriptor * nd)390 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
391 {
392 memset(params, 0, PARAMS_LEN);
393 memset(id, 0, NODEID_LEN);
394
395 if (nd->validity != ND_VALIDITY_VALID) {
396 strncpy(params, "n/a", PARAMS_LEN - 1);
397 strncpy(id, "n/a", NODEID_LEN - 1);
398 return;
399 }
400
401 /* PARAMS=xx,xxxxxx */
402 snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
403 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
404 id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
405 id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
406 id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
407 id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
408 id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
409 sprintf(id, "%04X", nd->tag);
410 }
411
chsc_process_sei_link_incident(struct chsc_sei_nt0_area * sei_area)412 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
413 {
414 struct lir *lir = (struct lir *) &sei_area->ccdf;
415 char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
416 aunodeid[NODEID_LEN];
417
418 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
419 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
420
421 /* Ignore NULL Link Incident Records. */
422 if (lir->iq.null)
423 return;
424
425 /* Inform user that a link requires maintenance actions because it has
426 * become degraded or not operational. Note that this log message is
427 * the primary intention behind a Link Incident Record. */
428
429 format_node_data(iuparams, iunodeid, &lir->incident_node);
430 format_node_data(auparams, aunodeid, &lir->attached_node);
431
432 switch (lir->iq.class) {
433 case LIR_IQ_CLASS_DEGRADED:
434 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
435 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
436 sei_area->rs, sei_area->rsid, lir->ic, iuparams,
437 iunodeid, auparams, aunodeid);
438 break;
439 case LIR_IQ_CLASS_NOT_OPERATIONAL:
440 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
441 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
442 sei_area->rs, sei_area->rsid, lir->ic, iuparams,
443 iunodeid, auparams, aunodeid);
444 break;
445 default:
446 break;
447 }
448 }
449
chsc_process_sei_res_acc(struct chsc_sei_nt0_area * sei_area)450 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
451 {
452 struct channel_path *chp;
453 struct chp_link link;
454 struct chp_id chpid;
455 int status;
456
457 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
458 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
459 if (sei_area->rs != 4)
460 return;
461 chp_id_init(&chpid);
462 chpid.id = sei_area->rsid;
463 /* allocate a new channel path structure, if needed */
464 status = chp_get_status(chpid);
465 if (!status)
466 return;
467
468 if (status < 0) {
469 chp_new(chpid);
470 } else {
471 chp = chpid_to_chp(chpid);
472 mutex_lock(&chp->lock);
473 chp_update_desc(chp);
474 mutex_unlock(&chp->lock);
475 }
476 memset(&link, 0, sizeof(struct chp_link));
477 link.chpid = chpid;
478 chsc_link_from_sei(&link, sei_area);
479 s390_process_res_acc(&link);
480 }
481
chsc_process_sei_chp_avail(struct chsc_sei_nt0_area * sei_area)482 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
483 {
484 struct channel_path *chp;
485 struct chp_id chpid;
486 u8 *data;
487 int num;
488
489 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
490 if (sei_area->rs != 0)
491 return;
492 data = sei_area->ccdf;
493 chp_id_init(&chpid);
494 for (num = 0; num <= __MAX_CHPID; num++) {
495 if (!chp_test_bit(data, num))
496 continue;
497 chpid.id = num;
498
499 CIO_CRW_EVENT(4, "Update information for channel path "
500 "%x.%02x\n", chpid.cssid, chpid.id);
501 chp = chpid_to_chp(chpid);
502 if (!chp) {
503 chp_new(chpid);
504 continue;
505 }
506 mutex_lock(&chp->lock);
507 chp_update_desc(chp);
508 mutex_unlock(&chp->lock);
509 }
510 }
511
512 struct chp_config_data {
513 u8 map[32];
514 u8 op;
515 u8 pc;
516 };
517
chsc_process_sei_chp_config(struct chsc_sei_nt0_area * sei_area)518 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
519 {
520 struct chp_config_data *data;
521 struct chp_id chpid;
522 int num;
523 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
524
525 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
526 if (sei_area->rs != 0)
527 return;
528 data = (struct chp_config_data *) &(sei_area->ccdf);
529 chp_id_init(&chpid);
530 for (num = 0; num <= __MAX_CHPID; num++) {
531 if (!chp_test_bit(data->map, num))
532 continue;
533 chpid.id = num;
534 pr_notice("Processing %s for channel path %x.%02x\n",
535 events[data->op], chpid.cssid, chpid.id);
536 switch (data->op) {
537 case 0:
538 chp_cfg_schedule(chpid, 1);
539 break;
540 case 1:
541 chp_cfg_schedule(chpid, 0);
542 break;
543 case 2:
544 chp_cfg_cancel_deconfigure(chpid);
545 break;
546 }
547 }
548 }
549
chsc_process_sei_scm_change(struct chsc_sei_nt0_area * sei_area)550 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
551 {
552 int ret;
553
554 CIO_CRW_EVENT(4, "chsc: scm change notification\n");
555 if (sei_area->rs != 7)
556 return;
557
558 ret = scm_update_information();
559 if (ret)
560 CIO_CRW_EVENT(0, "chsc: updating change notification"
561 " failed (rc=%d).\n", ret);
562 }
563
chsc_process_sei_scm_avail(struct chsc_sei_nt0_area * sei_area)564 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
565 {
566 int ret;
567
568 CIO_CRW_EVENT(4, "chsc: scm available information\n");
569 if (sei_area->rs != 7)
570 return;
571
572 ret = scm_process_availability_information();
573 if (ret)
574 CIO_CRW_EVENT(0, "chsc: process availability information"
575 " failed (rc=%d).\n", ret);
576 }
577
chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area * sei_area)578 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
579 {
580 CIO_CRW_EVENT(3, "chsc: ap config changed\n");
581 if (sei_area->rs != 5)
582 return;
583
584 ap_bus_cfg_chg();
585 }
586
chsc_process_sei_fces_event(struct chsc_sei_nt0_area * sei_area)587 static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
588 {
589 struct chp_link link;
590 struct chp_id chpid;
591 struct channel_path *chp;
592
593 CIO_CRW_EVENT(4,
594 "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
595 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
596
597 if (sei_area->rs != SEI_RS_CHPID)
598 return;
599 chp_id_init(&chpid);
600 chpid.id = sei_area->rsid;
601
602 /* Ignore the event on unknown/invalid chp */
603 chp = chpid_to_chp(chpid);
604 if (!chp)
605 return;
606
607 memset(&link, 0, sizeof(struct chp_link));
608 link.chpid = chpid;
609 chsc_link_from_sei(&link, sei_area);
610
611 for_each_subchannel_staged(process_fces_event, NULL, &link);
612 }
613
chsc_process_sei_nt2(struct chsc_sei_nt2_area * sei_area)614 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
615 {
616 switch (sei_area->cc) {
617 case 1:
618 zpci_event_error(sei_area->ccdf);
619 break;
620 case 2:
621 zpci_event_availability(sei_area->ccdf);
622 break;
623 default:
624 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
625 sei_area->cc);
626 break;
627 }
628 }
629
chsc_process_sei_nt0(struct chsc_sei_nt0_area * sei_area)630 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
631 {
632 /* which kind of information was stored? */
633 switch (sei_area->cc) {
634 case 1: /* link incident*/
635 chsc_process_sei_link_incident(sei_area);
636 break;
637 case 2: /* i/o resource accessibility */
638 chsc_process_sei_res_acc(sei_area);
639 break;
640 case 3: /* ap config changed */
641 chsc_process_sei_ap_cfg_chg(sei_area);
642 break;
643 case 7: /* channel-path-availability information */
644 chsc_process_sei_chp_avail(sei_area);
645 break;
646 case 8: /* channel-path-configuration notification */
647 chsc_process_sei_chp_config(sei_area);
648 break;
649 case 12: /* scm change notification */
650 chsc_process_sei_scm_change(sei_area);
651 break;
652 case 14: /* scm available notification */
653 chsc_process_sei_scm_avail(sei_area);
654 break;
655 case 15: /* FCES event notification */
656 chsc_process_sei_fces_event(sei_area);
657 break;
658 default: /* other stuff */
659 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
660 sei_area->cc);
661 break;
662 }
663
664 /* Check if we might have lost some information. */
665 if (sei_area->flags & 0x40) {
666 CIO_CRW_EVENT(2, "chsc: event overflow\n");
667 css_schedule_eval_all();
668 }
669 }
670
chsc_process_event_information(struct chsc_sei * sei,u64 ntsm)671 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
672 {
673 static int ntsm_unsupported;
674
675 while (true) {
676 memset(sei, 0, sizeof(*sei));
677 sei->request.length = 0x0010;
678 sei->request.code = 0x000e;
679 if (!ntsm_unsupported)
680 sei->ntsm = ntsm;
681
682 if (chsc(sei))
683 break;
684
685 if (sei->response.code != 0x0001) {
686 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
687 sei->response.code, sei->ntsm);
688
689 if (sei->response.code == 3 && sei->ntsm) {
690 /* Fallback for old firmware. */
691 ntsm_unsupported = 1;
692 continue;
693 }
694 break;
695 }
696
697 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
698 switch (sei->nt) {
699 case 0:
700 chsc_process_sei_nt0(&sei->u.nt0_area);
701 break;
702 case 2:
703 chsc_process_sei_nt2(&sei->u.nt2_area);
704 break;
705 default:
706 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
707 break;
708 }
709
710 if (!(sei->u.nt0_area.flags & 0x80))
711 break;
712 }
713 }
714
715 /*
716 * Handle channel subsystem related CRWs.
717 * Use store event information to find out what's going on.
718 *
719 * Note: Access to sei_page is serialized through machine check handler
720 * thread, so no need for locking.
721 */
chsc_process_crw(struct crw * crw0,struct crw * crw1,int overflow)722 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
723 {
724 struct chsc_sei *sei = sei_page;
725
726 if (overflow) {
727 css_schedule_eval_all();
728 return;
729 }
730 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
731 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
732 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
733 crw0->erc, crw0->rsid);
734
735 CIO_TRACE_EVENT(2, "prcss");
736 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
737 }
738
chsc_chp_online(struct chp_id chpid)739 void chsc_chp_online(struct chp_id chpid)
740 {
741 struct channel_path *chp = chpid_to_chp(chpid);
742 struct chp_link link;
743 char dbf_txt[15];
744
745 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
746 CIO_TRACE_EVENT(2, dbf_txt);
747
748 if (chp_get_status(chpid) != 0) {
749 memset(&link, 0, sizeof(struct chp_link));
750 link.chpid = chpid;
751 /* Wait until previous actions have settled. */
752 css_wait_for_slow_path();
753
754 mutex_lock(&chp->lock);
755 chp_update_desc(chp);
756 mutex_unlock(&chp->lock);
757
758 for_each_subchannel_staged(__s390_process_res_acc, NULL,
759 &link);
760 css_schedule_reprobe();
761 }
762 }
763
__s390_subchannel_vary_chpid(struct subchannel * sch,struct chp_id chpid,int on)764 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
765 struct chp_id chpid, int on)
766 {
767 unsigned long flags;
768 struct chp_link link;
769
770 memset(&link, 0, sizeof(struct chp_link));
771 link.chpid = chpid;
772 spin_lock_irqsave(sch->lock, flags);
773 if (sch->driver && sch->driver->chp_event)
774 sch->driver->chp_event(sch, &link,
775 on ? CHP_VARY_ON : CHP_VARY_OFF);
776 spin_unlock_irqrestore(sch->lock, flags);
777 }
778
s390_subchannel_vary_chpid_off(struct subchannel * sch,void * data)779 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
780 {
781 struct chp_id *chpid = data;
782
783 __s390_subchannel_vary_chpid(sch, *chpid, 0);
784 return 0;
785 }
786
s390_subchannel_vary_chpid_on(struct subchannel * sch,void * data)787 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
788 {
789 struct chp_id *chpid = data;
790
791 __s390_subchannel_vary_chpid(sch, *chpid, 1);
792 return 0;
793 }
794
795 /**
796 * chsc_chp_vary - propagate channel-path vary operation to subchannels
797 * @chpid: channl-path ID
798 * @on: non-zero for vary online, zero for vary offline
799 */
chsc_chp_vary(struct chp_id chpid,int on)800 int chsc_chp_vary(struct chp_id chpid, int on)
801 {
802 struct channel_path *chp = chpid_to_chp(chpid);
803
804 /*
805 * Redo PathVerification on the devices the chpid connects to
806 */
807 if (on) {
808 /* Try to update the channel path description. */
809 chp_update_desc(chp);
810 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
811 NULL, &chpid);
812 css_schedule_reprobe();
813 } else
814 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
815 NULL, &chpid);
816
817 return 0;
818 }
819
820 static void
chsc_remove_cmg_attr(struct channel_subsystem * css)821 chsc_remove_cmg_attr(struct channel_subsystem *css)
822 {
823 int i;
824
825 for (i = 0; i <= __MAX_CHPID; i++) {
826 if (!css->chps[i])
827 continue;
828 chp_remove_cmg_attr(css->chps[i]);
829 }
830 }
831
832 static int
chsc_add_cmg_attr(struct channel_subsystem * css)833 chsc_add_cmg_attr(struct channel_subsystem *css)
834 {
835 int i, ret;
836
837 ret = 0;
838 for (i = 0; i <= __MAX_CHPID; i++) {
839 if (!css->chps[i])
840 continue;
841 ret = chp_add_cmg_attr(css->chps[i]);
842 if (ret)
843 goto cleanup;
844 }
845 return ret;
846 cleanup:
847 for (--i; i >= 0; i--) {
848 if (!css->chps[i])
849 continue;
850 chp_remove_cmg_attr(css->chps[i]);
851 }
852 return ret;
853 }
854
__chsc_do_secm(struct channel_subsystem * css,int enable)855 int __chsc_do_secm(struct channel_subsystem *css, int enable)
856 {
857 struct {
858 struct chsc_header request;
859 u32 operation_code : 2;
860 u32 : 30;
861 u32 key : 4;
862 u32 : 28;
863 u32 zeroes1;
864 u32 cub_addr1;
865 u32 zeroes2;
866 u32 cub_addr2;
867 u32 reserved[13];
868 struct chsc_header response;
869 u32 status : 8;
870 u32 : 4;
871 u32 fmt : 4;
872 u32 : 16;
873 } *secm_area;
874 unsigned long flags;
875 int ret, ccode;
876
877 spin_lock_irqsave(&chsc_page_lock, flags);
878 memset(chsc_page, 0, PAGE_SIZE);
879 secm_area = chsc_page;
880 secm_area->request.length = 0x0050;
881 secm_area->request.code = 0x0016;
882
883 secm_area->key = PAGE_DEFAULT_KEY >> 4;
884 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
885 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
886
887 secm_area->operation_code = enable ? 0 : 1;
888
889 ccode = chsc(secm_area);
890 if (ccode > 0) {
891 ret = (ccode == 3) ? -ENODEV : -EBUSY;
892 goto out;
893 }
894
895 switch (secm_area->response.code) {
896 case 0x0102:
897 case 0x0103:
898 ret = -EINVAL;
899 break;
900 default:
901 ret = chsc_error_from_response(secm_area->response.code);
902 }
903 if (ret != 0)
904 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
905 secm_area->response.code);
906 out:
907 spin_unlock_irqrestore(&chsc_page_lock, flags);
908 return ret;
909 }
910
911 int
chsc_secm(struct channel_subsystem * css,int enable)912 chsc_secm(struct channel_subsystem *css, int enable)
913 {
914 int ret;
915
916 if (enable && !css->cm_enabled) {
917 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
918 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
919 if (!css->cub_addr1 || !css->cub_addr2) {
920 free_page((unsigned long)css->cub_addr1);
921 free_page((unsigned long)css->cub_addr2);
922 return -ENOMEM;
923 }
924 }
925 ret = __chsc_do_secm(css, enable);
926 if (!ret) {
927 css->cm_enabled = enable;
928 if (css->cm_enabled) {
929 ret = chsc_add_cmg_attr(css);
930 if (ret) {
931 __chsc_do_secm(css, 0);
932 css->cm_enabled = 0;
933 }
934 } else
935 chsc_remove_cmg_attr(css);
936 }
937 if (!css->cm_enabled) {
938 free_page((unsigned long)css->cub_addr1);
939 free_page((unsigned long)css->cub_addr2);
940 }
941 return ret;
942 }
943
chsc_determine_channel_path_desc(struct chp_id chpid,int fmt,int rfmt,int c,int m,void * page)944 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
945 int c, int m, void *page)
946 {
947 struct chsc_scpd *scpd_area;
948 int ccode, ret;
949
950 if ((rfmt == 1 || rfmt == 0) && c == 1 &&
951 !css_general_characteristics.fcs)
952 return -EINVAL;
953 if ((rfmt == 2) && !css_general_characteristics.cib)
954 return -EINVAL;
955 if ((rfmt == 3) && !css_general_characteristics.util_str)
956 return -EINVAL;
957
958 memset(page, 0, PAGE_SIZE);
959 scpd_area = page;
960 scpd_area->request.length = 0x0010;
961 scpd_area->request.code = 0x0002;
962 scpd_area->cssid = chpid.cssid;
963 scpd_area->first_chpid = chpid.id;
964 scpd_area->last_chpid = chpid.id;
965 scpd_area->m = m;
966 scpd_area->c = c;
967 scpd_area->fmt = fmt;
968 scpd_area->rfmt = rfmt;
969
970 ccode = chsc(scpd_area);
971 if (ccode > 0)
972 return (ccode == 3) ? -ENODEV : -EBUSY;
973
974 ret = chsc_error_from_response(scpd_area->response.code);
975 if (ret)
976 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
977 scpd_area->response.code);
978 return ret;
979 }
980 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
981
982 #define chsc_det_chp_desc(FMT, c) \
983 int chsc_determine_fmt##FMT##_channel_path_desc( \
984 struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \
985 { \
986 struct chsc_scpd *scpd_area; \
987 unsigned long flags; \
988 int ret; \
989 \
990 spin_lock_irqsave(&chsc_page_lock, flags); \
991 scpd_area = chsc_page; \
992 ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \
993 scpd_area); \
994 if (ret) \
995 goto out; \
996 \
997 memcpy(desc, scpd_area->data, sizeof(*desc)); \
998 out: \
999 spin_unlock_irqrestore(&chsc_page_lock, flags); \
1000 return ret; \
1001 }
1002
1003 chsc_det_chp_desc(0, 0)
1004 chsc_det_chp_desc(1, 1)
1005 chsc_det_chp_desc(3, 0)
1006
1007 static void
chsc_initialize_cmg_chars(struct channel_path * chp,u8 cmcv,struct cmg_chars * chars)1008 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1009 struct cmg_chars *chars)
1010 {
1011 int i, mask;
1012
1013 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1014 mask = 0x80 >> (i + 3);
1015 if (cmcv & mask)
1016 chp->cmg_chars.values[i] = chars->values[i];
1017 else
1018 chp->cmg_chars.values[i] = 0;
1019 }
1020 }
1021
chsc_get_channel_measurement_chars(struct channel_path * chp)1022 int chsc_get_channel_measurement_chars(struct channel_path *chp)
1023 {
1024 unsigned long flags;
1025 int ccode, ret;
1026
1027 struct {
1028 struct chsc_header request;
1029 u32 : 24;
1030 u32 first_chpid : 8;
1031 u32 : 24;
1032 u32 last_chpid : 8;
1033 u32 zeroes1;
1034 struct chsc_header response;
1035 u32 zeroes2;
1036 u32 not_valid : 1;
1037 u32 shared : 1;
1038 u32 : 22;
1039 u32 chpid : 8;
1040 u32 cmcv : 5;
1041 u32 : 11;
1042 u32 cmgq : 8;
1043 u32 cmg : 8;
1044 u32 zeroes3;
1045 u32 data[NR_MEASUREMENT_CHARS];
1046 } *scmc_area;
1047
1048 chp->shared = -1;
1049 chp->cmg = -1;
1050
1051 if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1052 return -EINVAL;
1053
1054 spin_lock_irqsave(&chsc_page_lock, flags);
1055 memset(chsc_page, 0, PAGE_SIZE);
1056 scmc_area = chsc_page;
1057 scmc_area->request.length = 0x0010;
1058 scmc_area->request.code = 0x0022;
1059 scmc_area->first_chpid = chp->chpid.id;
1060 scmc_area->last_chpid = chp->chpid.id;
1061
1062 ccode = chsc(scmc_area);
1063 if (ccode > 0) {
1064 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1065 goto out;
1066 }
1067
1068 ret = chsc_error_from_response(scmc_area->response.code);
1069 if (ret) {
1070 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1071 scmc_area->response.code);
1072 goto out;
1073 }
1074 if (scmc_area->not_valid)
1075 goto out;
1076
1077 chp->cmg = scmc_area->cmg;
1078 chp->shared = scmc_area->shared;
1079 if (chp->cmg != 2 && chp->cmg != 3) {
1080 /* No cmg-dependent data. */
1081 goto out;
1082 }
1083 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1084 (struct cmg_chars *) &scmc_area->data);
1085 out:
1086 spin_unlock_irqrestore(&chsc_page_lock, flags);
1087 return ret;
1088 }
1089
chsc_init(void)1090 int __init chsc_init(void)
1091 {
1092 int ret;
1093
1094 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1095 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1096 if (!sei_page || !chsc_page) {
1097 ret = -ENOMEM;
1098 goto out_err;
1099 }
1100 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1101 if (ret)
1102 goto out_err;
1103 return ret;
1104 out_err:
1105 free_page((unsigned long)chsc_page);
1106 free_page((unsigned long)sei_page);
1107 return ret;
1108 }
1109
chsc_init_cleanup(void)1110 void __init chsc_init_cleanup(void)
1111 {
1112 crw_unregister_handler(CRW_RSC_CSS);
1113 free_page((unsigned long)chsc_page);
1114 free_page((unsigned long)sei_page);
1115 }
1116
__chsc_enable_facility(struct chsc_sda_area * sda_area,int operation_code)1117 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1118 {
1119 int ret;
1120
1121 sda_area->request.length = 0x0400;
1122 sda_area->request.code = 0x0031;
1123 sda_area->operation_code = operation_code;
1124
1125 ret = chsc(sda_area);
1126 if (ret > 0) {
1127 ret = (ret == 3) ? -ENODEV : -EBUSY;
1128 goto out;
1129 }
1130
1131 switch (sda_area->response.code) {
1132 case 0x0101:
1133 ret = -EOPNOTSUPP;
1134 break;
1135 default:
1136 ret = chsc_error_from_response(sda_area->response.code);
1137 }
1138 out:
1139 return ret;
1140 }
1141
chsc_enable_facility(int operation_code)1142 int chsc_enable_facility(int operation_code)
1143 {
1144 struct chsc_sda_area *sda_area;
1145 unsigned long flags;
1146 int ret;
1147
1148 spin_lock_irqsave(&chsc_page_lock, flags);
1149 memset(chsc_page, 0, PAGE_SIZE);
1150 sda_area = chsc_page;
1151
1152 ret = __chsc_enable_facility(sda_area, operation_code);
1153 if (ret != 0)
1154 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1155 operation_code, sda_area->response.code);
1156
1157 spin_unlock_irqrestore(&chsc_page_lock, flags);
1158 return ret;
1159 }
1160
chsc_get_cssid_iid(int idx,u8 * cssid,u8 * iid)1161 int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
1162 {
1163 struct {
1164 struct chsc_header request;
1165 u8 atype;
1166 u32 : 24;
1167 u32 reserved1[6];
1168 struct chsc_header response;
1169 u32 reserved2[3];
1170 struct {
1171 u8 cssid;
1172 u8 iid;
1173 u32 : 16;
1174 } list[0];
1175 } *sdcal_area;
1176 int ret;
1177
1178 spin_lock_irq(&chsc_page_lock);
1179 memset(chsc_page, 0, PAGE_SIZE);
1180 sdcal_area = chsc_page;
1181 sdcal_area->request.length = 0x0020;
1182 sdcal_area->request.code = 0x0034;
1183 sdcal_area->atype = 4;
1184
1185 ret = chsc(sdcal_area);
1186 if (ret) {
1187 ret = (ret == 3) ? -ENODEV : -EBUSY;
1188 goto exit;
1189 }
1190
1191 ret = chsc_error_from_response(sdcal_area->response.code);
1192 if (ret) {
1193 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1194 sdcal_area->response.code);
1195 goto exit;
1196 }
1197
1198 if ((addr_t) &sdcal_area->list[idx] <
1199 (addr_t) &sdcal_area->response + sdcal_area->response.length) {
1200 *cssid = sdcal_area->list[idx].cssid;
1201 *iid = sdcal_area->list[idx].iid;
1202 }
1203 else
1204 ret = -ENODEV;
1205 exit:
1206 spin_unlock_irq(&chsc_page_lock);
1207 return ret;
1208 }
1209
1210 struct css_general_char css_general_characteristics;
1211 struct css_chsc_char css_chsc_characteristics;
1212
1213 int __init
chsc_determine_css_characteristics(void)1214 chsc_determine_css_characteristics(void)
1215 {
1216 unsigned long flags;
1217 int result;
1218 struct {
1219 struct chsc_header request;
1220 u32 reserved1;
1221 u32 reserved2;
1222 u32 reserved3;
1223 struct chsc_header response;
1224 u32 reserved4;
1225 u32 general_char[510];
1226 u32 chsc_char[508];
1227 } *scsc_area;
1228
1229 spin_lock_irqsave(&chsc_page_lock, flags);
1230 memset(chsc_page, 0, PAGE_SIZE);
1231 scsc_area = chsc_page;
1232 scsc_area->request.length = 0x0010;
1233 scsc_area->request.code = 0x0010;
1234
1235 result = chsc(scsc_area);
1236 if (result) {
1237 result = (result == 3) ? -ENODEV : -EBUSY;
1238 goto exit;
1239 }
1240
1241 result = chsc_error_from_response(scsc_area->response.code);
1242 if (result == 0) {
1243 memcpy(&css_general_characteristics, scsc_area->general_char,
1244 sizeof(css_general_characteristics));
1245 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1246 sizeof(css_chsc_characteristics));
1247 } else
1248 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1249 scsc_area->response.code);
1250 exit:
1251 spin_unlock_irqrestore(&chsc_page_lock, flags);
1252 return result;
1253 }
1254
1255 EXPORT_SYMBOL_GPL(css_general_characteristics);
1256 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1257
chsc_sstpc(void * page,unsigned int op,u16 ctrl,long * clock_delta)1258 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta)
1259 {
1260 struct {
1261 struct chsc_header request;
1262 unsigned int rsvd0;
1263 unsigned int op : 8;
1264 unsigned int rsvd1 : 8;
1265 unsigned int ctrl : 16;
1266 unsigned int rsvd2[5];
1267 struct chsc_header response;
1268 unsigned int rsvd3[3];
1269 s64 clock_delta;
1270 unsigned int rsvd4[2];
1271 } *rr;
1272 int rc;
1273
1274 memset(page, 0, PAGE_SIZE);
1275 rr = page;
1276 rr->request.length = 0x0020;
1277 rr->request.code = 0x0033;
1278 rr->op = op;
1279 rr->ctrl = ctrl;
1280 rc = chsc(rr);
1281 if (rc)
1282 return -EIO;
1283 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1284 if (clock_delta)
1285 *clock_delta = rr->clock_delta;
1286 return rc;
1287 }
1288
chsc_sstpi(void * page,void * result,size_t size)1289 int chsc_sstpi(void *page, void *result, size_t size)
1290 {
1291 struct {
1292 struct chsc_header request;
1293 unsigned int rsvd0[3];
1294 struct chsc_header response;
1295 char data[];
1296 } *rr;
1297 int rc;
1298
1299 memset(page, 0, PAGE_SIZE);
1300 rr = page;
1301 rr->request.length = 0x0010;
1302 rr->request.code = 0x0038;
1303 rc = chsc(rr);
1304 if (rc)
1305 return -EIO;
1306 memcpy(result, &rr->data, size);
1307 return (rr->response.code == 0x0001) ? 0 : -EIO;
1308 }
1309
chsc_stzi(void * page,void * result,size_t size)1310 int chsc_stzi(void *page, void *result, size_t size)
1311 {
1312 struct {
1313 struct chsc_header request;
1314 unsigned int rsvd0[3];
1315 struct chsc_header response;
1316 char data[];
1317 } *rr;
1318 int rc;
1319
1320 memset(page, 0, PAGE_SIZE);
1321 rr = page;
1322 rr->request.length = 0x0010;
1323 rr->request.code = 0x003e;
1324 rc = chsc(rr);
1325 if (rc)
1326 return -EIO;
1327 memcpy(result, &rr->data, size);
1328 return (rr->response.code == 0x0001) ? 0 : -EIO;
1329 }
1330
chsc_siosl(struct subchannel_id schid)1331 int chsc_siosl(struct subchannel_id schid)
1332 {
1333 struct {
1334 struct chsc_header request;
1335 u32 word1;
1336 struct subchannel_id sid;
1337 u32 word3;
1338 struct chsc_header response;
1339 u32 word[11];
1340 } *siosl_area;
1341 unsigned long flags;
1342 int ccode;
1343 int rc;
1344
1345 spin_lock_irqsave(&chsc_page_lock, flags);
1346 memset(chsc_page, 0, PAGE_SIZE);
1347 siosl_area = chsc_page;
1348 siosl_area->request.length = 0x0010;
1349 siosl_area->request.code = 0x0046;
1350 siosl_area->word1 = 0x80000000;
1351 siosl_area->sid = schid;
1352
1353 ccode = chsc(siosl_area);
1354 if (ccode > 0) {
1355 if (ccode == 3)
1356 rc = -ENODEV;
1357 else
1358 rc = -EBUSY;
1359 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1360 schid.ssid, schid.sch_no, ccode);
1361 goto out;
1362 }
1363 rc = chsc_error_from_response(siosl_area->response.code);
1364 if (rc)
1365 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1366 schid.ssid, schid.sch_no,
1367 siosl_area->response.code);
1368 else
1369 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1370 schid.ssid, schid.sch_no);
1371 out:
1372 spin_unlock_irqrestore(&chsc_page_lock, flags);
1373 return rc;
1374 }
1375 EXPORT_SYMBOL_GPL(chsc_siosl);
1376
1377 /**
1378 * chsc_scm_info() - store SCM information (SSI)
1379 * @scm_area: request and response block for SSI
1380 * @token: continuation token
1381 *
1382 * Returns 0 on success.
1383 */
chsc_scm_info(struct chsc_scm_info * scm_area,u64 token)1384 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1385 {
1386 int ccode, ret;
1387
1388 memset(scm_area, 0, sizeof(*scm_area));
1389 scm_area->request.length = 0x0020;
1390 scm_area->request.code = 0x004C;
1391 scm_area->reqtok = token;
1392
1393 ccode = chsc(scm_area);
1394 if (ccode > 0) {
1395 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1396 goto out;
1397 }
1398 ret = chsc_error_from_response(scm_area->response.code);
1399 if (ret != 0)
1400 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1401 scm_area->response.code);
1402 out:
1403 return ret;
1404 }
1405 EXPORT_SYMBOL_GPL(chsc_scm_info);
1406
1407 /**
1408 * chsc_pnso() - Perform Network-Subchannel Operation
1409 * @schid: id of the subchannel on which PNSO is performed
1410 * @pnso_area: request and response block for the operation
1411 * @oc: Operation Code
1412 * @resume_token: resume token for multiblock response
1413 * @cnc: Boolean change-notification control
1414 *
1415 * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1416 *
1417 * Returns 0 on success.
1418 */
chsc_pnso(struct subchannel_id schid,struct chsc_pnso_area * pnso_area,u8 oc,struct chsc_pnso_resume_token resume_token,int cnc)1419 int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
1420 u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
1421 {
1422 memset(pnso_area, 0, sizeof(*pnso_area));
1423 pnso_area->request.length = 0x0030;
1424 pnso_area->request.code = 0x003d; /* network-subchannel operation */
1425 pnso_area->m = schid.m;
1426 pnso_area->ssid = schid.ssid;
1427 pnso_area->sch = schid.sch_no;
1428 pnso_area->cssid = schid.cssid;
1429 pnso_area->oc = oc;
1430 pnso_area->resume_token = resume_token;
1431 pnso_area->n = (cnc != 0);
1432 if (chsc(pnso_area))
1433 return -EIO;
1434 return chsc_error_from_response(pnso_area->response.code);
1435 }
1436
chsc_sgib(u32 origin)1437 int chsc_sgib(u32 origin)
1438 {
1439 struct {
1440 struct chsc_header request;
1441 u16 op;
1442 u8 reserved01[2];
1443 u8 reserved02:4;
1444 u8 fmt:4;
1445 u8 reserved03[7];
1446 /* operation data area begin */
1447 u8 reserved04[4];
1448 u32 gib_origin;
1449 u8 reserved05[10];
1450 u8 aix;
1451 u8 reserved06[4029];
1452 struct chsc_header response;
1453 u8 reserved07[4];
1454 } *sgib_area;
1455 int ret;
1456
1457 spin_lock_irq(&chsc_page_lock);
1458 memset(chsc_page, 0, PAGE_SIZE);
1459 sgib_area = chsc_page;
1460 sgib_area->request.length = 0x0fe0;
1461 sgib_area->request.code = 0x0021;
1462 sgib_area->op = 0x1;
1463 sgib_area->gib_origin = origin;
1464
1465 ret = chsc(sgib_area);
1466 if (ret == 0)
1467 ret = chsc_error_from_response(sgib_area->response.code);
1468 spin_unlock_irq(&chsc_page_lock);
1469
1470 return ret;
1471 }
1472 EXPORT_SYMBOL_GPL(chsc_sgib);
1473
1474 #define SCUD_REQ_LEN 0x10 /* SCUD request block length */
1475 #define SCUD_REQ_CMD 0x4b /* SCUD Command Code */
1476
1477 struct chse_cudb {
1478 u16 flags:8;
1479 u16 chp_valid:8;
1480 u16 cu;
1481 u32 esm_valid:8;
1482 u32:24;
1483 u8 chpid[8];
1484 u32:32;
1485 u32:32;
1486 u8 esm[8];
1487 u32 efla[8];
1488 } __packed;
1489
1490 struct chsc_scud {
1491 struct chsc_header request;
1492 u16:4;
1493 u16 fmt:4;
1494 u16 cssid:8;
1495 u16 first_cu;
1496 u16:16;
1497 u16 last_cu;
1498 u32:32;
1499 struct chsc_header response;
1500 u16:4;
1501 u16 fmt_resp:4;
1502 u32:24;
1503 struct chse_cudb cudb[];
1504 } __packed;
1505
1506 /**
1507 * chsc_scud() - Store control-unit description.
1508 * @cu: number of the control-unit
1509 * @esm: 8 1-byte endpoint security mode values
1510 * @esm_valid: validity mask for @esm
1511 *
1512 * Interface to retrieve information about the endpoint security
1513 * modes for up to 8 paths of a control unit.
1514 *
1515 * Returns 0 on success.
1516 */
chsc_scud(u16 cu,u64 * esm,u8 * esm_valid)1517 int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
1518 {
1519 struct chsc_scud *scud = chsc_page;
1520 int ret;
1521
1522 spin_lock_irq(&chsc_page_lock);
1523 memset(chsc_page, 0, PAGE_SIZE);
1524 scud->request.length = SCUD_REQ_LEN;
1525 scud->request.code = SCUD_REQ_CMD;
1526 scud->fmt = 0;
1527 scud->cssid = 0;
1528 scud->first_cu = cu;
1529 scud->last_cu = cu;
1530
1531 ret = chsc(scud);
1532 if (!ret)
1533 ret = chsc_error_from_response(scud->response.code);
1534
1535 if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
1536 || !(scud->cudb[0].flags & 0x80)
1537 || scud->cudb[0].cu != cu)) {
1538
1539 CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
1540 "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
1541 scud->response.code, scud->response.length,
1542 scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
1543 ret = -EINVAL;
1544 }
1545
1546 if (ret)
1547 goto out;
1548
1549 memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
1550 *esm_valid = scud->cudb[0].esm_valid;
1551 out:
1552 spin_unlock_irq(&chsc_page_lock);
1553 return ret;
1554 }
1555 EXPORT_SYMBOL_GPL(chsc_scud);
1556