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