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
28 #include "css.h"
29 #include "cio.h"
30 #include "cio_debug.h"
31 #include "ioasm.h"
32 #include "chp.h"
33 #include "chsc.h"
34
35 static void *sei_page;
36 static void *chsc_page;
37 static DEFINE_SPINLOCK(chsc_page_lock);
38
39 #define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */
40 #define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */
41
42 static BLOCKING_NOTIFIER_HEAD(chsc_notifiers);
43
chsc_notifier_register(struct notifier_block * nb)44 int chsc_notifier_register(struct notifier_block *nb)
45 {
46 return blocking_notifier_chain_register(&chsc_notifiers, nb);
47 }
48 EXPORT_SYMBOL(chsc_notifier_register);
49
chsc_notifier_unregister(struct notifier_block * nb)50 int chsc_notifier_unregister(struct notifier_block *nb)
51 {
52 return blocking_notifier_chain_unregister(&chsc_notifiers, nb);
53 }
54 EXPORT_SYMBOL(chsc_notifier_unregister);
55
56 /**
57 * chsc_error_from_response() - convert a chsc response to an error
58 * @response: chsc response code
59 *
60 * Returns an appropriate Linux error code for @response.
61 */
chsc_error_from_response(int response)62 int chsc_error_from_response(int response)
63 {
64 switch (response) {
65 case 0x0001:
66 return 0;
67 case 0x0002:
68 case 0x0003:
69 case 0x0006:
70 case 0x0007:
71 case 0x0008:
72 case 0x000a:
73 case 0x0104:
74 return -EINVAL;
75 case 0x0004:
76 case 0x0106: /* "Wrong Channel Parm" for the op 0x003d */
77 return -EOPNOTSUPP;
78 case 0x000b:
79 case 0x0107: /* "Channel busy" for the op 0x003d */
80 return -EBUSY;
81 case 0x0100:
82 case 0x0102:
83 return -ENOMEM;
84 case 0x0108: /* "HW limit exceeded" for the op 0x003d */
85 return -EUSERS;
86 default:
87 return -EIO;
88 }
89 }
90 EXPORT_SYMBOL_GPL(chsc_error_from_response);
91
92 struct chsc_ssd_area {
93 struct chsc_header request;
94 u16 :10;
95 u16 ssid:2;
96 u16 :4;
97 u16 f_sch; /* first subchannel */
98 u16 :16;
99 u16 l_sch; /* last subchannel */
100 u32 :32;
101 struct chsc_header response;
102 u32 :32;
103 u8 sch_valid : 1;
104 u8 dev_valid : 1;
105 u8 st : 3; /* subchannel type */
106 u8 zeroes : 3;
107 u8 unit_addr; /* unit address */
108 u16 devno; /* device number */
109 u8 path_mask;
110 u8 fla_valid_mask;
111 u16 sch; /* subchannel */
112 u8 chpid[8]; /* chpids 0-7 */
113 u16 fla[8]; /* full link addresses 0-7 */
114 } __packed __aligned(PAGE_SIZE);
115
chsc_get_ssd_info(struct subchannel_id schid,struct chsc_ssd_info * ssd)116 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
117 {
118 struct chsc_ssd_area *ssd_area;
119 unsigned long flags;
120 int ccode;
121 int ret;
122 int i;
123 int mask;
124
125 spin_lock_irqsave(&chsc_page_lock, flags);
126 memset(chsc_page, 0, PAGE_SIZE);
127 ssd_area = chsc_page;
128 ssd_area->request.length = 0x0010;
129 ssd_area->request.code = 0x0004;
130 ssd_area->ssid = schid.ssid;
131 ssd_area->f_sch = schid.sch_no;
132 ssd_area->l_sch = schid.sch_no;
133
134 ccode = chsc(ssd_area);
135 /* Check response. */
136 if (ccode > 0) {
137 ret = (ccode == 3) ? -ENODEV : -EBUSY;
138 goto out;
139 }
140 ret = chsc_error_from_response(ssd_area->response.code);
141 if (ret != 0) {
142 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
143 schid.ssid, schid.sch_no,
144 ssd_area->response.code);
145 goto out;
146 }
147 if (!ssd_area->sch_valid) {
148 ret = -ENODEV;
149 goto out;
150 }
151 /* Copy data */
152 ret = 0;
153 memset(ssd, 0, sizeof(struct chsc_ssd_info));
154 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
155 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
156 goto out;
157 ssd->path_mask = ssd_area->path_mask;
158 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
159 for (i = 0; i < 8; i++) {
160 mask = 0x80 >> i;
161 if (ssd_area->path_mask & mask) {
162 chp_id_init(&ssd->chpid[i]);
163 ssd->chpid[i].id = ssd_area->chpid[i];
164 }
165 if (ssd_area->fla_valid_mask & mask)
166 ssd->fla[i] = ssd_area->fla[i];
167 }
168 out:
169 spin_unlock_irqrestore(&chsc_page_lock, flags);
170 return ret;
171 }
172
173 /**
174 * chsc_ssqd() - store subchannel QDIO data (SSQD)
175 * @schid: id of the subchannel on which SSQD is performed
176 * @ssqd: request and response block for SSQD
177 *
178 * Returns 0 on success.
179 */
chsc_ssqd(struct subchannel_id schid,struct chsc_ssqd_area * ssqd)180 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
181 {
182 memset(ssqd, 0, sizeof(*ssqd));
183 ssqd->request.length = 0x0010;
184 ssqd->request.code = 0x0024;
185 ssqd->first_sch = schid.sch_no;
186 ssqd->last_sch = schid.sch_no;
187 ssqd->ssid = schid.ssid;
188
189 if (chsc(ssqd))
190 return -EIO;
191
192 return chsc_error_from_response(ssqd->response.code);
193 }
194 EXPORT_SYMBOL_GPL(chsc_ssqd);
195
196 /**
197 * chsc_sadc() - set adapter device controls (SADC)
198 * @schid: id of the subchannel on which SADC is performed
199 * @scssc: request and response block for SADC
200 * @summary_indicator_addr: summary indicator address
201 * @subchannel_indicator_addr: subchannel indicator address
202 * @isc: Interruption Subclass for this subchannel
203 *
204 * Returns 0 on success.
205 */
chsc_sadc(struct subchannel_id schid,struct chsc_scssc_area * scssc,dma64_t summary_indicator_addr,dma64_t subchannel_indicator_addr,u8 isc)206 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
207 dma64_t summary_indicator_addr, dma64_t subchannel_indicator_addr, u8 isc)
208 {
209 memset(scssc, 0, sizeof(*scssc));
210 scssc->request.length = 0x0fe0;
211 scssc->request.code = 0x0021;
212 scssc->operation_code = 0;
213
214 scssc->summary_indicator_addr = summary_indicator_addr;
215 scssc->subchannel_indicator_addr = subchannel_indicator_addr;
216
217 scssc->ks = PAGE_DEFAULT_KEY >> 4;
218 scssc->kc = PAGE_DEFAULT_KEY >> 4;
219 scssc->isc = isc;
220 scssc->schid = schid;
221
222 /* enable the time delay disablement facility */
223 if (css_general_characteristics.aif_tdd)
224 scssc->word_with_d_bit = 0x10000000;
225
226 if (chsc(scssc))
227 return -EIO;
228
229 return chsc_error_from_response(scssc->response.code);
230 }
231 EXPORT_SYMBOL_GPL(chsc_sadc);
232
s390_subchannel_remove_chpid(struct subchannel * sch,void * data)233 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
234 {
235 spin_lock_irq(&sch->lock);
236 if (sch->driver && sch->driver->chp_event)
237 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
238 goto out_unreg;
239 spin_unlock_irq(&sch->lock);
240 return 0;
241
242 out_unreg:
243 sch->lpm = 0;
244 spin_unlock_irq(&sch->lock);
245 css_schedule_eval(sch->schid);
246 return 0;
247 }
248
chsc_chp_offline(struct chp_id chpid)249 void chsc_chp_offline(struct chp_id chpid)
250 {
251 struct channel_path *chp = chpid_to_chp(chpid);
252 struct chp_link link;
253 char dbf_txt[15];
254
255 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
256 CIO_TRACE_EVENT(2, dbf_txt);
257
258 if (chp_get_status(chpid) <= 0)
259 return;
260 memset(&link, 0, sizeof(struct chp_link));
261 link.chpid = chpid;
262 /* Wait until previous actions have settled. */
263 css_wait_for_slow_path();
264
265 mutex_lock(&chp->lock);
266 chp_update_desc(chp);
267 mutex_unlock(&chp->lock);
268
269 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
270 }
271
__s390_process_res_acc(struct subchannel * sch,void * data)272 static int __s390_process_res_acc(struct subchannel *sch, void *data)
273 {
274 spin_lock_irq(&sch->lock);
275 if (sch->driver && sch->driver->chp_event)
276 sch->driver->chp_event(sch, data, CHP_ONLINE);
277 spin_unlock_irq(&sch->lock);
278
279 return 0;
280 }
281
s390_process_res_acc(struct chp_link * link)282 static void s390_process_res_acc(struct chp_link *link)
283 {
284 char dbf_txt[15];
285
286 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
287 link->chpid.id);
288 CIO_TRACE_EVENT( 2, dbf_txt);
289 if (link->fla != 0) {
290 sprintf(dbf_txt, "fla%x", link->fla);
291 CIO_TRACE_EVENT( 2, dbf_txt);
292 }
293 /* Wait until previous actions have settled. */
294 css_wait_for_slow_path();
295 /*
296 * I/O resources may have become accessible.
297 * Scan through all subchannels that may be concerned and
298 * do a validation on those.
299 * The more information we have (info), the less scanning
300 * will we have to do.
301 */
302 for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
303 css_schedule_reprobe();
304 }
305
process_fces_event(struct subchannel * sch,void * data)306 static int process_fces_event(struct subchannel *sch, void *data)
307 {
308 spin_lock_irq(&sch->lock);
309 if (sch->driver && sch->driver->chp_event)
310 sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
311 spin_unlock_irq(&sch->lock);
312 return 0;
313 }
314
315 struct chsc_sei_nt0_area {
316 u8 flags;
317 u8 vf; /* validity flags */
318 u8 rs; /* reporting source */
319 u8 cc; /* content code */
320 u16 fla; /* full link address */
321 u16 rsid; /* reporting source id */
322 u32 reserved1;
323 u32 reserved2;
324 /* ccdf has to be big enough for a link-incident record */
325 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
326 } __packed;
327
328 struct chsc_sei_nt2_area {
329 u8 flags; /* p and v bit */
330 u8 reserved1;
331 u8 reserved2;
332 u8 cc; /* content code */
333 u32 reserved3[13];
334 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
335 } __packed;
336
337 #define CHSC_SEI_NT0 (1ULL << 63)
338 #define CHSC_SEI_NT2 (1ULL << 61)
339
340 struct chsc_sei {
341 struct chsc_header request;
342 u32 reserved1;
343 u64 ntsm; /* notification type mask */
344 struct chsc_header response;
345 u32 :24;
346 u8 nt;
347 union {
348 struct chsc_sei_nt0_area nt0_area;
349 struct chsc_sei_nt2_area nt2_area;
350 u8 nt_area[PAGE_SIZE - 24];
351 } u;
352 } __packed __aligned(PAGE_SIZE);
353
354 /*
355 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
356 */
357
358 #define LIR_IQ_CLASS_INFO 0
359 #define LIR_IQ_CLASS_DEGRADED 1
360 #define LIR_IQ_CLASS_NOT_OPERATIONAL 2
361
362 struct lir {
363 struct {
364 u32 null:1;
365 u32 reserved:3;
366 u32 class:2;
367 u32 reserved2:2;
368 } __packed iq;
369 u32 ic:8;
370 u32 reserved:16;
371 struct node_descriptor incident_node;
372 struct node_descriptor attached_node;
373 u8 reserved2[32];
374 } __packed;
375
376 #define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */
377 #define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
378
379 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
store_ebcdic(char * dest,const char * src,unsigned long len,char delim)380 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
381 char delim)
382 {
383 memcpy(dest, src, len);
384 EBCASC(dest, len);
385
386 if (delim)
387 dest[len++] = delim;
388
389 return dest + len;
390 }
391
chsc_link_from_sei(struct chp_link * link,struct chsc_sei_nt0_area * sei_area)392 static void chsc_link_from_sei(struct chp_link *link,
393 struct chsc_sei_nt0_area *sei_area)
394 {
395 if ((sei_area->vf & SEI_VF_FLA) != 0) {
396 link->fla = sei_area->fla;
397 link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
398 0xffff : 0xff00;
399 }
400 }
401
402 /* Format node ID and parameters for output in LIR log message. */
format_node_data(char * params,char * id,struct node_descriptor * nd)403 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
404 {
405 memset(params, 0, PARAMS_LEN);
406 memset(id, 0, NODEID_LEN);
407
408 if (nd->validity != ND_VALIDITY_VALID) {
409 strscpy(params, "n/a", PARAMS_LEN);
410 strscpy(id, "n/a", NODEID_LEN);
411 return;
412 }
413
414 /* PARAMS=xx,xxxxxx */
415 snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
416 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
417 id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
418 id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
419 id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
420 id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
421 id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
422 sprintf(id, "%04X", nd->tag);
423 }
424
chsc_process_sei_link_incident(struct chsc_sei_nt0_area * sei_area)425 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
426 {
427 struct lir *lir = (struct lir *) &sei_area->ccdf;
428 char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
429 aunodeid[NODEID_LEN];
430
431 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
432 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
433
434 /* Ignore NULL Link Incident Records. */
435 if (lir->iq.null)
436 return;
437
438 /* Inform user that a link requires maintenance actions because it has
439 * become degraded or not operational. Note that this log message is
440 * the primary intention behind a Link Incident Record. */
441
442 format_node_data(iuparams, iunodeid, &lir->incident_node);
443 format_node_data(auparams, aunodeid, &lir->attached_node);
444
445 switch (lir->iq.class) {
446 case LIR_IQ_CLASS_DEGRADED:
447 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
448 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
449 sei_area->rs, sei_area->rsid, lir->ic, iuparams,
450 iunodeid, auparams, aunodeid);
451 break;
452 case LIR_IQ_CLASS_NOT_OPERATIONAL:
453 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
454 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
455 sei_area->rs, sei_area->rsid, lir->ic, iuparams,
456 iunodeid, auparams, aunodeid);
457 break;
458 default:
459 break;
460 }
461 }
462
chsc_process_sei_res_acc(struct chsc_sei_nt0_area * sei_area)463 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
464 {
465 struct channel_path *chp;
466 struct chp_link link;
467 struct chp_id chpid;
468 int status;
469
470 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
471 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
472 if (sei_area->rs != 4)
473 return;
474 chp_id_init(&chpid);
475 chpid.id = sei_area->rsid;
476 /* allocate a new channel path structure, if needed */
477 status = chp_get_status(chpid);
478 if (!status)
479 return;
480
481 if (status < 0) {
482 chp_new(chpid);
483 } else {
484 chp = chpid_to_chp(chpid);
485 mutex_lock(&chp->lock);
486 chp_update_desc(chp);
487 mutex_unlock(&chp->lock);
488 }
489 memset(&link, 0, sizeof(struct chp_link));
490 link.chpid = chpid;
491 chsc_link_from_sei(&link, sei_area);
492 s390_process_res_acc(&link);
493 }
494
chsc_process_sei_chp_avail(struct chsc_sei_nt0_area * sei_area)495 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
496 {
497 struct channel_path *chp;
498 struct chp_id chpid;
499 u8 *data;
500 int num;
501
502 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
503 if (sei_area->rs != 0)
504 return;
505 data = sei_area->ccdf;
506 chp_id_init(&chpid);
507 for (num = 0; num <= __MAX_CHPID; num++) {
508 if (!chp_test_bit(data, num))
509 continue;
510 chpid.id = num;
511
512 CIO_CRW_EVENT(4, "Update information for channel path "
513 "%x.%02x\n", chpid.cssid, chpid.id);
514 chp = chpid_to_chp(chpid);
515 if (!chp) {
516 chp_new(chpid);
517 continue;
518 }
519 mutex_lock(&chp->lock);
520 chp_update_desc(chp);
521 mutex_unlock(&chp->lock);
522 }
523 }
524
525 struct chp_config_data {
526 u8 map[32];
527 u8 op;
528 u8 pc;
529 };
530
chsc_process_sei_chp_config(struct chsc_sei_nt0_area * sei_area)531 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
532 {
533 struct chp_config_data *data;
534 struct chp_id chpid;
535 int num;
536 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
537
538 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
539 if (sei_area->rs != 0)
540 return;
541 data = (struct chp_config_data *) &(sei_area->ccdf);
542 chp_id_init(&chpid);
543 for (num = 0; num <= __MAX_CHPID; num++) {
544 if (!chp_test_bit(data->map, num))
545 continue;
546 chpid.id = num;
547 pr_notice("Processing %s for channel path %x.%02x\n",
548 events[data->op], chpid.cssid, chpid.id);
549 switch (data->op) {
550 case 0:
551 chp_cfg_schedule(chpid, 1);
552 break;
553 case 1:
554 chp_cfg_schedule(chpid, 0);
555 break;
556 case 2:
557 chp_cfg_cancel_deconfigure(chpid);
558 break;
559 }
560 }
561 }
562
chsc_process_sei_scm_change(struct chsc_sei_nt0_area * sei_area)563 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
564 {
565 int ret;
566
567 CIO_CRW_EVENT(4, "chsc: scm change notification\n");
568 if (sei_area->rs != 7)
569 return;
570
571 ret = scm_update_information();
572 if (ret)
573 CIO_CRW_EVENT(0, "chsc: updating change notification"
574 " failed (rc=%d).\n", ret);
575 }
576
chsc_process_sei_scm_avail(struct chsc_sei_nt0_area * sei_area)577 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
578 {
579 int ret;
580
581 CIO_CRW_EVENT(4, "chsc: scm available information\n");
582 if (sei_area->rs != 7)
583 return;
584
585 ret = scm_process_availability_information();
586 if (ret)
587 CIO_CRW_EVENT(0, "chsc: process availability information"
588 " failed (rc=%d).\n", ret);
589 }
590
chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area * sei_area)591 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
592 {
593 CIO_CRW_EVENT(3, "chsc: ap config changed\n");
594 if (sei_area->rs != 5)
595 return;
596
597 blocking_notifier_call_chain(&chsc_notifiers,
598 CHSC_NOTIFY_AP_CFG, NULL);
599 }
600
chsc_process_sei_fces_event(struct chsc_sei_nt0_area * sei_area)601 static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
602 {
603 struct chp_link link;
604 struct chp_id chpid;
605 struct channel_path *chp;
606
607 CIO_CRW_EVENT(4,
608 "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
609 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
610
611 if (sei_area->rs != SEI_RS_CHPID)
612 return;
613 chp_id_init(&chpid);
614 chpid.id = sei_area->rsid;
615
616 /* Ignore the event on unknown/invalid chp */
617 chp = chpid_to_chp(chpid);
618 if (!chp)
619 return;
620
621 memset(&link, 0, sizeof(struct chp_link));
622 link.chpid = chpid;
623 chsc_link_from_sei(&link, sei_area);
624
625 for_each_subchannel_staged(process_fces_event, NULL, &link);
626 }
627
chsc_process_sei_nt2(struct chsc_sei_nt2_area * sei_area)628 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
629 {
630 switch (sei_area->cc) {
631 case 1:
632 zpci_event_error(sei_area->ccdf);
633 break;
634 case 2:
635 zpci_event_availability(sei_area->ccdf);
636 break;
637 default:
638 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
639 sei_area->cc);
640 break;
641 }
642 }
643
chsc_process_sei_nt0(struct chsc_sei_nt0_area * sei_area)644 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
645 {
646 /* which kind of information was stored? */
647 switch (sei_area->cc) {
648 case 1: /* link incident*/
649 chsc_process_sei_link_incident(sei_area);
650 break;
651 case 2: /* i/o resource accessibility */
652 chsc_process_sei_res_acc(sei_area);
653 break;
654 case 3: /* ap config changed */
655 chsc_process_sei_ap_cfg_chg(sei_area);
656 break;
657 case 7: /* channel-path-availability information */
658 chsc_process_sei_chp_avail(sei_area);
659 break;
660 case 8: /* channel-path-configuration notification */
661 chsc_process_sei_chp_config(sei_area);
662 break;
663 case 12: /* scm change notification */
664 chsc_process_sei_scm_change(sei_area);
665 break;
666 case 14: /* scm available notification */
667 chsc_process_sei_scm_avail(sei_area);
668 break;
669 case 15: /* FCES event notification */
670 chsc_process_sei_fces_event(sei_area);
671 break;
672 default: /* other stuff */
673 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
674 sei_area->cc);
675 break;
676 }
677
678 /* Check if we might have lost some information. */
679 if (sei_area->flags & 0x40) {
680 CIO_CRW_EVENT(2, "chsc: event overflow\n");
681 css_schedule_eval_all();
682 }
683 }
684
chsc_process_event_information(struct chsc_sei * sei,u64 ntsm)685 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
686 {
687 static int ntsm_unsupported;
688
689 while (true) {
690 memset(sei, 0, sizeof(*sei));
691 sei->request.length = 0x0010;
692 sei->request.code = 0x000e;
693 if (!ntsm_unsupported)
694 sei->ntsm = ntsm;
695
696 if (chsc(sei))
697 break;
698
699 if (sei->response.code != 0x0001) {
700 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
701 sei->response.code, sei->ntsm);
702
703 if (sei->response.code == 3 && sei->ntsm) {
704 /* Fallback for old firmware. */
705 ntsm_unsupported = 1;
706 continue;
707 }
708 break;
709 }
710
711 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
712 switch (sei->nt) {
713 case 0:
714 chsc_process_sei_nt0(&sei->u.nt0_area);
715 break;
716 case 2:
717 chsc_process_sei_nt2(&sei->u.nt2_area);
718 break;
719 default:
720 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
721 break;
722 }
723
724 if (!(sei->u.nt0_area.flags & 0x80))
725 break;
726 }
727 }
728
729 /*
730 * Handle channel subsystem related CRWs.
731 * Use store event information to find out what's going on.
732 *
733 * Note: Access to sei_page is serialized through machine check handler
734 * thread, so no need for locking.
735 */
chsc_process_crw(struct crw * crw0,struct crw * crw1,int overflow)736 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
737 {
738 struct chsc_sei *sei = sei_page;
739
740 if (overflow) {
741 css_schedule_eval_all();
742 return;
743 }
744 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
745 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
746 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
747 crw0->erc, crw0->rsid);
748
749 CIO_TRACE_EVENT(2, "prcss");
750 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
751 }
752
chsc_chp_online(struct chp_id chpid)753 void chsc_chp_online(struct chp_id chpid)
754 {
755 struct channel_path *chp = chpid_to_chp(chpid);
756 struct chp_link link;
757 char dbf_txt[15];
758
759 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
760 CIO_TRACE_EVENT(2, dbf_txt);
761
762 if (chp_get_status(chpid) != 0) {
763 memset(&link, 0, sizeof(struct chp_link));
764 link.chpid = chpid;
765 /* Wait until previous actions have settled. */
766 css_wait_for_slow_path();
767
768 mutex_lock(&chp->lock);
769 chp_update_desc(chp);
770 mutex_unlock(&chp->lock);
771
772 for_each_subchannel_staged(__s390_process_res_acc, NULL,
773 &link);
774 css_schedule_reprobe();
775 }
776 }
777
__s390_subchannel_vary_chpid(struct subchannel * sch,struct chp_id chpid,int on)778 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
779 struct chp_id chpid, int on)
780 {
781 unsigned long flags;
782 struct chp_link link;
783
784 memset(&link, 0, sizeof(struct chp_link));
785 link.chpid = chpid;
786 spin_lock_irqsave(&sch->lock, flags);
787 if (sch->driver && sch->driver->chp_event)
788 sch->driver->chp_event(sch, &link,
789 on ? CHP_VARY_ON : CHP_VARY_OFF);
790 spin_unlock_irqrestore(&sch->lock, flags);
791 }
792
s390_subchannel_vary_chpid_off(struct subchannel * sch,void * data)793 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
794 {
795 struct chp_id *chpid = data;
796
797 __s390_subchannel_vary_chpid(sch, *chpid, 0);
798 return 0;
799 }
800
s390_subchannel_vary_chpid_on(struct subchannel * sch,void * data)801 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
802 {
803 struct chp_id *chpid = data;
804
805 __s390_subchannel_vary_chpid(sch, *chpid, 1);
806 return 0;
807 }
808
809 /**
810 * chsc_chp_vary - propagate channel-path vary operation to subchannels
811 * @chpid: channl-path ID
812 * @on: non-zero for vary online, zero for vary offline
813 */
chsc_chp_vary(struct chp_id chpid,int on)814 int chsc_chp_vary(struct chp_id chpid, int on)
815 {
816 struct channel_path *chp = chpid_to_chp(chpid);
817
818 /*
819 * Redo PathVerification on the devices the chpid connects to
820 */
821 if (on) {
822 /* Try to update the channel path description. */
823 chp_update_desc(chp);
824 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
825 NULL, &chpid);
826 css_schedule_reprobe();
827 } else
828 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
829 NULL, &chpid);
830
831 return 0;
832 }
833
834 static void
chsc_remove_cmg_attr(struct channel_subsystem * css)835 chsc_remove_cmg_attr(struct channel_subsystem *css)
836 {
837 int i;
838
839 for (i = 0; i <= __MAX_CHPID; i++) {
840 if (!css->chps[i])
841 continue;
842 chp_remove_cmg_attr(css->chps[i]);
843 }
844 }
845
846 static int
chsc_add_cmg_attr(struct channel_subsystem * css)847 chsc_add_cmg_attr(struct channel_subsystem *css)
848 {
849 int i, ret;
850
851 ret = 0;
852 for (i = 0; i <= __MAX_CHPID; i++) {
853 if (!css->chps[i])
854 continue;
855 ret = chp_add_cmg_attr(css->chps[i]);
856 if (ret)
857 goto cleanup;
858 }
859 return ret;
860 cleanup:
861 while (i--) {
862 if (!css->chps[i])
863 continue;
864 chp_remove_cmg_attr(css->chps[i]);
865 }
866 return ret;
867 }
868
__chsc_do_secm(struct channel_subsystem * css,int enable)869 int __chsc_do_secm(struct channel_subsystem *css, int enable)
870 {
871 struct {
872 struct chsc_header request;
873 u32 operation_code : 2;
874 u32 : 1;
875 u32 e : 1;
876 u32 : 28;
877 u32 key : 4;
878 u32 : 28;
879 dma64_t cub[CSS_NUM_CUB_PAGES];
880 dma64_t ecub[CSS_NUM_ECUB_PAGES];
881 u32 reserved[5];
882 struct chsc_header response;
883 u32 status : 8;
884 u32 : 4;
885 u32 fmt : 4;
886 u32 : 16;
887 } __packed *secm_area;
888 unsigned long flags;
889 int ret, ccode, i;
890
891 spin_lock_irqsave(&chsc_page_lock, flags);
892 memset(chsc_page, 0, PAGE_SIZE);
893 secm_area = chsc_page;
894 secm_area->request.length = 0x0050;
895 secm_area->request.code = 0x0016;
896
897 secm_area->key = PAGE_DEFAULT_KEY >> 4;
898 secm_area->e = 1;
899
900 for (i = 0; i < CSS_NUM_CUB_PAGES; i++)
901 secm_area->cub[i] = (__force dma64_t)virt_to_dma32(css->cub[i]);
902 for (i = 0; i < CSS_NUM_ECUB_PAGES; i++)
903 secm_area->ecub[i] = virt_to_dma64(css->ecub[i]);
904
905 secm_area->operation_code = enable ? 0 : 1;
906
907 ccode = chsc(secm_area);
908 if (ccode > 0) {
909 ret = (ccode == 3) ? -ENODEV : -EBUSY;
910 goto out;
911 }
912
913 switch (secm_area->response.code) {
914 case 0x0102:
915 case 0x0103:
916 ret = -EINVAL;
917 break;
918 default:
919 ret = chsc_error_from_response(secm_area->response.code);
920 }
921 if (ret != 0)
922 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
923 secm_area->response.code);
924 out:
925 spin_unlock_irqrestore(&chsc_page_lock, flags);
926 return ret;
927 }
928
cub_alloc(struct channel_subsystem * css)929 static int cub_alloc(struct channel_subsystem *css)
930 {
931 int i;
932
933 for (i = 0; i < CSS_NUM_CUB_PAGES; i++) {
934 css->cub[i] = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
935 if (!css->cub[i])
936 return -ENOMEM;
937 }
938 for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) {
939 css->ecub[i] = (void *)get_zeroed_page(GFP_KERNEL);
940 if (!css->ecub[i])
941 return -ENOMEM;
942 }
943
944 return 0;
945 }
946
cub_free(struct channel_subsystem * css)947 static void cub_free(struct channel_subsystem *css)
948 {
949 int i;
950
951 for (i = 0; i < CSS_NUM_CUB_PAGES; i++) {
952 free_page((unsigned long)css->cub[i]);
953 css->cub[i] = NULL;
954 }
955 for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) {
956 free_page((unsigned long)css->ecub[i]);
957 css->ecub[i] = NULL;
958 }
959 }
960
961 int
chsc_secm(struct channel_subsystem * css,int enable)962 chsc_secm(struct channel_subsystem *css, int enable)
963 {
964 int ret;
965
966 if (enable && !css->cm_enabled) {
967 ret = cub_alloc(css);
968 if (ret)
969 goto out;
970 }
971 ret = __chsc_do_secm(css, enable);
972 if (!ret) {
973 css->cm_enabled = enable;
974 if (css->cm_enabled) {
975 ret = chsc_add_cmg_attr(css);
976 if (ret) {
977 __chsc_do_secm(css, 0);
978 css->cm_enabled = 0;
979 }
980 } else
981 chsc_remove_cmg_attr(css);
982 }
983
984 out:
985 if (!css->cm_enabled)
986 cub_free(css);
987
988 return ret;
989 }
990
chsc_determine_channel_path_desc(struct chp_id chpid,int fmt,int rfmt,int c,int m,void * page)991 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
992 int c, int m, void *page)
993 {
994 struct chsc_scpd *scpd_area;
995 int ccode, ret;
996
997 if ((rfmt == 1 || rfmt == 0) && c == 1 &&
998 !css_general_characteristics.fcs)
999 return -EINVAL;
1000 if ((rfmt == 2) && !css_general_characteristics.cib)
1001 return -EINVAL;
1002 if ((rfmt == 3) && !css_general_characteristics.util_str)
1003 return -EINVAL;
1004
1005 memset(page, 0, PAGE_SIZE);
1006 scpd_area = page;
1007 scpd_area->request.length = 0x0010;
1008 scpd_area->request.code = 0x0002;
1009 scpd_area->cssid = chpid.cssid;
1010 scpd_area->first_chpid = chpid.id;
1011 scpd_area->last_chpid = chpid.id;
1012 scpd_area->m = m;
1013 scpd_area->c = c;
1014 scpd_area->fmt = fmt;
1015 scpd_area->rfmt = rfmt;
1016
1017 ccode = chsc(scpd_area);
1018 if (ccode > 0)
1019 return (ccode == 3) ? -ENODEV : -EBUSY;
1020
1021 ret = chsc_error_from_response(scpd_area->response.code);
1022 if (ret)
1023 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
1024 scpd_area->response.code);
1025 return ret;
1026 }
1027 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
1028
1029 #define chsc_det_chp_desc(FMT, c) \
1030 int chsc_determine_fmt##FMT##_channel_path_desc( \
1031 struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \
1032 { \
1033 struct chsc_scpd *scpd_area; \
1034 unsigned long flags; \
1035 int ret; \
1036 \
1037 spin_lock_irqsave(&chsc_page_lock, flags); \
1038 scpd_area = chsc_page; \
1039 ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \
1040 scpd_area); \
1041 if (ret) \
1042 goto out; \
1043 \
1044 memcpy(desc, scpd_area->data, sizeof(*desc)); \
1045 out: \
1046 spin_unlock_irqrestore(&chsc_page_lock, flags); \
1047 return ret; \
1048 }
1049
1050 chsc_det_chp_desc(0, 0)
1051 chsc_det_chp_desc(1, 1)
1052 chsc_det_chp_desc(3, 0)
1053
1054 static void
chsc_initialize_cmg_chars(struct channel_path * chp,u8 cmcv,struct cmg_chars * chars)1055 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1056 struct cmg_chars *chars)
1057 {
1058 int i, mask;
1059
1060 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1061 mask = 0x80 >> (i + 3);
1062 if (cmcv & mask)
1063 chp->cmg_chars.values[i] = chars->values[i];
1064 else
1065 chp->cmg_chars.values[i] = 0;
1066 }
1067 }
1068
scmc_get_speed(u32 s,u32 p)1069 static unsigned long scmc_get_speed(u32 s, u32 p)
1070 {
1071 unsigned long speed = s;
1072
1073 if (!p)
1074 p = 8;
1075 while (p--)
1076 speed *= 10;
1077
1078 return speed;
1079 }
1080
chsc_get_channel_measurement_chars(struct channel_path * chp)1081 int chsc_get_channel_measurement_chars(struct channel_path *chp)
1082 {
1083 unsigned long flags;
1084 int ccode, ret;
1085
1086 struct {
1087 struct chsc_header request;
1088 u32 : 24;
1089 u32 first_chpid : 8;
1090 u32 : 24;
1091 u32 last_chpid : 8;
1092 u32 zeroes1;
1093 struct chsc_header response;
1094 u32 zeroes2;
1095 u32 not_valid : 1;
1096 u32 shared : 1;
1097 u32 extended : 1;
1098 u32 : 21;
1099 u32 chpid : 8;
1100 u32 cmcv : 5;
1101 u32 : 7;
1102 u32 cmgp : 4;
1103 u32 cmgq : 8;
1104 u32 cmg : 8;
1105 u32 : 16;
1106 u32 cmgs : 16;
1107 u32 data[NR_MEASUREMENT_CHARS];
1108 } *scmc_area;
1109
1110 chp->shared = -1;
1111 chp->cmg = -1;
1112 chp->extended = 0;
1113 chp->speed = 0;
1114
1115 if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1116 return -EINVAL;
1117
1118 spin_lock_irqsave(&chsc_page_lock, flags);
1119 memset(chsc_page, 0, PAGE_SIZE);
1120 scmc_area = chsc_page;
1121 scmc_area->request.length = 0x0010;
1122 scmc_area->request.code = 0x0022;
1123 scmc_area->first_chpid = chp->chpid.id;
1124 scmc_area->last_chpid = chp->chpid.id;
1125
1126 ccode = chsc(scmc_area);
1127 if (ccode > 0) {
1128 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1129 goto out;
1130 }
1131
1132 ret = chsc_error_from_response(scmc_area->response.code);
1133 if (ret) {
1134 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1135 scmc_area->response.code);
1136 goto out;
1137 }
1138 if (scmc_area->not_valid)
1139 goto out;
1140
1141 chp->cmg = scmc_area->cmg;
1142 chp->shared = scmc_area->shared;
1143 chp->extended = scmc_area->extended;
1144 chp->speed = scmc_get_speed(scmc_area->cmgs, scmc_area->cmgp);
1145 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1146 (struct cmg_chars *) &scmc_area->data);
1147 out:
1148 spin_unlock_irqrestore(&chsc_page_lock, flags);
1149 return ret;
1150 }
1151
chsc_init(void)1152 int __init chsc_init(void)
1153 {
1154 int ret;
1155
1156 sei_page = (void *)get_zeroed_page(GFP_KERNEL);
1157 chsc_page = (void *)get_zeroed_page(GFP_KERNEL);
1158 if (!sei_page || !chsc_page) {
1159 ret = -ENOMEM;
1160 goto out_err;
1161 }
1162 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1163 if (ret)
1164 goto out_err;
1165 return ret;
1166 out_err:
1167 free_page((unsigned long)chsc_page);
1168 free_page((unsigned long)sei_page);
1169 return ret;
1170 }
1171
chsc_init_cleanup(void)1172 void __init chsc_init_cleanup(void)
1173 {
1174 crw_unregister_handler(CRW_RSC_CSS);
1175 free_page((unsigned long)chsc_page);
1176 free_page((unsigned long)sei_page);
1177 }
1178
__chsc_enable_facility(struct chsc_sda_area * sda_area,int operation_code)1179 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1180 {
1181 int ret;
1182
1183 sda_area->request.length = 0x0400;
1184 sda_area->request.code = 0x0031;
1185 sda_area->operation_code = operation_code;
1186
1187 ret = chsc(sda_area);
1188 if (ret > 0) {
1189 ret = (ret == 3) ? -ENODEV : -EBUSY;
1190 goto out;
1191 }
1192
1193 switch (sda_area->response.code) {
1194 case 0x0101:
1195 ret = -EOPNOTSUPP;
1196 break;
1197 default:
1198 ret = chsc_error_from_response(sda_area->response.code);
1199 }
1200 out:
1201 return ret;
1202 }
1203
chsc_enable_facility(int operation_code)1204 int chsc_enable_facility(int operation_code)
1205 {
1206 struct chsc_sda_area *sda_area;
1207 unsigned long flags;
1208 int ret;
1209
1210 spin_lock_irqsave(&chsc_page_lock, flags);
1211 memset(chsc_page, 0, PAGE_SIZE);
1212 sda_area = chsc_page;
1213
1214 ret = __chsc_enable_facility(sda_area, operation_code);
1215 if (ret != 0)
1216 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1217 operation_code, sda_area->response.code);
1218
1219 spin_unlock_irqrestore(&chsc_page_lock, flags);
1220 return ret;
1221 }
1222
chsc_get_cssid_iid(int idx,u8 * cssid,u8 * iid)1223 int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
1224 {
1225 struct {
1226 struct chsc_header request;
1227 u8 atype;
1228 u32 : 24;
1229 u32 reserved1[6];
1230 struct chsc_header response;
1231 u32 reserved2[3];
1232 struct {
1233 u8 cssid;
1234 u8 iid;
1235 u32 : 16;
1236 } list[];
1237 } *sdcal_area;
1238 int ret;
1239
1240 spin_lock_irq(&chsc_page_lock);
1241 memset(chsc_page, 0, PAGE_SIZE);
1242 sdcal_area = chsc_page;
1243 sdcal_area->request.length = 0x0020;
1244 sdcal_area->request.code = 0x0034;
1245 sdcal_area->atype = 4;
1246
1247 ret = chsc(sdcal_area);
1248 if (ret) {
1249 ret = (ret == 3) ? -ENODEV : -EBUSY;
1250 goto exit;
1251 }
1252
1253 ret = chsc_error_from_response(sdcal_area->response.code);
1254 if (ret) {
1255 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1256 sdcal_area->response.code);
1257 goto exit;
1258 }
1259
1260 if ((addr_t) &sdcal_area->list[idx] <
1261 (addr_t) &sdcal_area->response + sdcal_area->response.length) {
1262 *cssid = sdcal_area->list[idx].cssid;
1263 *iid = sdcal_area->list[idx].iid;
1264 }
1265 else
1266 ret = -ENODEV;
1267 exit:
1268 spin_unlock_irq(&chsc_page_lock);
1269 return ret;
1270 }
1271
1272 struct css_general_char css_general_characteristics;
1273 struct css_chsc_char css_chsc_characteristics;
1274
1275 int __init
chsc_determine_css_characteristics(void)1276 chsc_determine_css_characteristics(void)
1277 {
1278 unsigned long flags;
1279 int result;
1280 struct {
1281 struct chsc_header request;
1282 u32 reserved1;
1283 u32 reserved2;
1284 u32 reserved3;
1285 struct chsc_header response;
1286 u32 reserved4;
1287 u32 general_char[510];
1288 u32 chsc_char[508];
1289 } *scsc_area;
1290
1291 spin_lock_irqsave(&chsc_page_lock, flags);
1292 memset(chsc_page, 0, PAGE_SIZE);
1293 scsc_area = chsc_page;
1294 scsc_area->request.length = 0x0010;
1295 scsc_area->request.code = 0x0010;
1296
1297 result = chsc(scsc_area);
1298 if (result) {
1299 result = (result == 3) ? -ENODEV : -EBUSY;
1300 goto exit;
1301 }
1302
1303 result = chsc_error_from_response(scsc_area->response.code);
1304 if (result == 0) {
1305 memcpy(&css_general_characteristics, scsc_area->general_char,
1306 sizeof(css_general_characteristics));
1307 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1308 sizeof(css_chsc_characteristics));
1309 } else
1310 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1311 scsc_area->response.code);
1312 exit:
1313 spin_unlock_irqrestore(&chsc_page_lock, flags);
1314 return result;
1315 }
1316
1317 EXPORT_SYMBOL_GPL(css_general_characteristics);
1318 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1319
chsc_sstpc(void * page,unsigned int op,u16 ctrl,long * clock_delta)1320 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta)
1321 {
1322 struct {
1323 struct chsc_header request;
1324 unsigned int rsvd0;
1325 unsigned int op : 8;
1326 unsigned int rsvd1 : 8;
1327 unsigned int ctrl : 16;
1328 unsigned int rsvd2[5];
1329 struct chsc_header response;
1330 unsigned int rsvd3[3];
1331 s64 clock_delta;
1332 unsigned int rsvd4[2];
1333 } *rr;
1334 int rc;
1335
1336 memset(page, 0, PAGE_SIZE);
1337 rr = page;
1338 rr->request.length = 0x0020;
1339 rr->request.code = 0x0033;
1340 rr->op = op;
1341 rr->ctrl = ctrl;
1342 rc = chsc(rr);
1343 if (rc)
1344 return -EIO;
1345 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1346 if (clock_delta)
1347 *clock_delta = rr->clock_delta;
1348 return rc;
1349 }
1350
chsc_sstpi(void * page,void * result,size_t size)1351 int chsc_sstpi(void *page, void *result, size_t size)
1352 {
1353 struct {
1354 struct chsc_header request;
1355 unsigned int rsvd0[3];
1356 struct chsc_header response;
1357 char data[];
1358 } *rr;
1359 int rc;
1360
1361 memset(page, 0, PAGE_SIZE);
1362 rr = page;
1363 rr->request.length = 0x0010;
1364 rr->request.code = 0x0038;
1365 rc = chsc(rr);
1366 if (rc)
1367 return -EIO;
1368 memcpy(result, &rr->data, size);
1369 return (rr->response.code == 0x0001) ? 0 : -EIO;
1370 }
1371
chsc_stzi(void * page,void * result,size_t size)1372 int chsc_stzi(void *page, void *result, size_t size)
1373 {
1374 struct {
1375 struct chsc_header request;
1376 unsigned int rsvd0[3];
1377 struct chsc_header response;
1378 char data[];
1379 } *rr;
1380 int rc;
1381
1382 memset(page, 0, PAGE_SIZE);
1383 rr = page;
1384 rr->request.length = 0x0010;
1385 rr->request.code = 0x003e;
1386 rc = chsc(rr);
1387 if (rc)
1388 return -EIO;
1389 memcpy(result, &rr->data, size);
1390 return (rr->response.code == 0x0001) ? 0 : -EIO;
1391 }
1392
chsc_siosl(struct subchannel_id schid)1393 int chsc_siosl(struct subchannel_id schid)
1394 {
1395 struct {
1396 struct chsc_header request;
1397 u32 word1;
1398 struct subchannel_id sid;
1399 u32 word3;
1400 struct chsc_header response;
1401 u32 word[11];
1402 } *siosl_area;
1403 unsigned long flags;
1404 int ccode;
1405 int rc;
1406
1407 spin_lock_irqsave(&chsc_page_lock, flags);
1408 memset(chsc_page, 0, PAGE_SIZE);
1409 siosl_area = chsc_page;
1410 siosl_area->request.length = 0x0010;
1411 siosl_area->request.code = 0x0046;
1412 siosl_area->word1 = 0x80000000;
1413 siosl_area->sid = schid;
1414
1415 ccode = chsc(siosl_area);
1416 if (ccode > 0) {
1417 if (ccode == 3)
1418 rc = -ENODEV;
1419 else
1420 rc = -EBUSY;
1421 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1422 schid.ssid, schid.sch_no, ccode);
1423 goto out;
1424 }
1425 rc = chsc_error_from_response(siosl_area->response.code);
1426 if (rc)
1427 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1428 schid.ssid, schid.sch_no,
1429 siosl_area->response.code);
1430 else
1431 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1432 schid.ssid, schid.sch_no);
1433 out:
1434 spin_unlock_irqrestore(&chsc_page_lock, flags);
1435 return rc;
1436 }
1437 EXPORT_SYMBOL_GPL(chsc_siosl);
1438
1439 /**
1440 * chsc_scm_info() - store SCM information (SSI)
1441 * @scm_area: request and response block for SSI
1442 * @token: continuation token
1443 *
1444 * Returns 0 on success.
1445 */
chsc_scm_info(struct chsc_scm_info * scm_area,u64 token)1446 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1447 {
1448 int ccode, ret;
1449
1450 memset(scm_area, 0, sizeof(*scm_area));
1451 scm_area->request.length = 0x0020;
1452 scm_area->request.code = 0x004C;
1453 scm_area->reqtok = token;
1454
1455 ccode = chsc(scm_area);
1456 if (ccode > 0) {
1457 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1458 goto out;
1459 }
1460 ret = chsc_error_from_response(scm_area->response.code);
1461 if (ret != 0)
1462 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1463 scm_area->response.code);
1464 out:
1465 return ret;
1466 }
1467 EXPORT_SYMBOL_GPL(chsc_scm_info);
1468
1469 /**
1470 * chsc_pnso() - Perform Network-Subchannel Operation
1471 * @schid: id of the subchannel on which PNSO is performed
1472 * @pnso_area: request and response block for the operation
1473 * @oc: Operation Code
1474 * @resume_token: resume token for multiblock response
1475 * @cnc: Boolean change-notification control
1476 *
1477 * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1478 *
1479 * Returns 0 on success.
1480 */
chsc_pnso(struct subchannel_id schid,struct chsc_pnso_area * pnso_area,u8 oc,struct chsc_pnso_resume_token resume_token,int cnc)1481 int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
1482 u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
1483 {
1484 memset(pnso_area, 0, sizeof(*pnso_area));
1485 pnso_area->request.length = 0x0030;
1486 pnso_area->request.code = 0x003d; /* network-subchannel operation */
1487 pnso_area->m = schid.m;
1488 pnso_area->ssid = schid.ssid;
1489 pnso_area->sch = schid.sch_no;
1490 pnso_area->cssid = schid.cssid;
1491 pnso_area->oc = oc;
1492 pnso_area->resume_token = resume_token;
1493 pnso_area->n = (cnc != 0);
1494 if (chsc(pnso_area))
1495 return -EIO;
1496 return chsc_error_from_response(pnso_area->response.code);
1497 }
1498
chsc_sgib(u32 origin)1499 int chsc_sgib(u32 origin)
1500 {
1501 struct {
1502 struct chsc_header request;
1503 u16 op;
1504 u8 reserved01[2];
1505 u8 reserved02:4;
1506 u8 fmt:4;
1507 u8 reserved03[7];
1508 /* operation data area begin */
1509 u8 reserved04[4];
1510 u32 gib_origin;
1511 u8 reserved05[10];
1512 u8 aix;
1513 u8 reserved06[4029];
1514 struct chsc_header response;
1515 u8 reserved07[4];
1516 } *sgib_area;
1517 int ret;
1518
1519 spin_lock_irq(&chsc_page_lock);
1520 memset(chsc_page, 0, PAGE_SIZE);
1521 sgib_area = chsc_page;
1522 sgib_area->request.length = 0x0fe0;
1523 sgib_area->request.code = 0x0021;
1524 sgib_area->op = 0x1;
1525 sgib_area->gib_origin = origin;
1526
1527 ret = chsc(sgib_area);
1528 if (ret == 0)
1529 ret = chsc_error_from_response(sgib_area->response.code);
1530 spin_unlock_irq(&chsc_page_lock);
1531
1532 return ret;
1533 }
1534 EXPORT_SYMBOL_GPL(chsc_sgib);
1535
1536 #define SCUD_REQ_LEN 0x10 /* SCUD request block length */
1537 #define SCUD_REQ_CMD 0x4b /* SCUD Command Code */
1538
1539 struct chse_cudb {
1540 u16 flags:8;
1541 u16 chp_valid:8;
1542 u16 cu;
1543 u32 esm_valid:8;
1544 u32:24;
1545 u8 chpid[8];
1546 u32:32;
1547 u32:32;
1548 u8 esm[8];
1549 u32 efla[8];
1550 } __packed;
1551
1552 struct chsc_scud {
1553 struct chsc_header request;
1554 u16:4;
1555 u16 fmt:4;
1556 u16 cssid:8;
1557 u16 first_cu;
1558 u16:16;
1559 u16 last_cu;
1560 u32:32;
1561 struct chsc_header response;
1562 u16:4;
1563 u16 fmt_resp:4;
1564 u32:24;
1565 struct chse_cudb cudb[];
1566 } __packed;
1567
1568 /**
1569 * chsc_scud() - Store control-unit description.
1570 * @cu: number of the control-unit
1571 * @esm: 8 1-byte endpoint security mode values
1572 * @esm_valid: validity mask for @esm
1573 *
1574 * Interface to retrieve information about the endpoint security
1575 * modes for up to 8 paths of a control unit.
1576 *
1577 * Returns 0 on success.
1578 */
chsc_scud(u16 cu,u64 * esm,u8 * esm_valid)1579 int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
1580 {
1581 struct chsc_scud *scud = chsc_page;
1582 int ret;
1583
1584 spin_lock_irq(&chsc_page_lock);
1585 memset(chsc_page, 0, PAGE_SIZE);
1586 scud->request.length = SCUD_REQ_LEN;
1587 scud->request.code = SCUD_REQ_CMD;
1588 scud->fmt = 0;
1589 scud->cssid = 0;
1590 scud->first_cu = cu;
1591 scud->last_cu = cu;
1592
1593 ret = chsc(scud);
1594 if (!ret)
1595 ret = chsc_error_from_response(scud->response.code);
1596
1597 if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
1598 || !(scud->cudb[0].flags & 0x80)
1599 || scud->cudb[0].cu != cu)) {
1600
1601 CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
1602 "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
1603 scud->response.code, scud->response.length,
1604 scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
1605 ret = -EINVAL;
1606 }
1607
1608 if (ret)
1609 goto out;
1610
1611 memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
1612 *esm_valid = scud->cudb[0].esm_valid;
1613 out:
1614 spin_unlock_irq(&chsc_page_lock);
1615 return ret;
1616 }
1617 EXPORT_SYMBOL_GPL(chsc_scud);
1618