?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
regulator: ad5398: Fix return value of ad5398_write_reg
[linux-2.6/btrfs-unstable.git] / drivers / s390 / cio / chsc.c
bloba831d18596a5ef592f88ec5af031f639606c8c0b
1 /*
2 * S/390 common I/O routines -- channel subsystem call
3 *
4 * Copyright IBM Corp. 1999,2012
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
8 */
9
10 #define KMSG_COMPONENT "cio"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
17 #include <linux/pci.h>
18
19 #include <asm/cio.h>
20 #include <asm/chpid.h>
21 #include <asm/chsc.h>
22 #include <asm/crw.h>
23 #include <asm/isc.h>
24 #include <asm/ebcdic.h>
25
26 #include "css.h"
27 #include "cio.h"
28 #include "cio_debug.h"
29 #include "ioasm.h"
30 #include "chp.h"
31 #include "chsc.h"
32
33 static void *sei_page;
34 static void *chsc_page;
35 static DEFINE_SPINLOCK(chsc_page_lock);
36
37 /**
38 * chsc_error_from_response() - convert a chsc response to an error
39 * @response: chsc response code
40 *
41 * Returns an appropriate Linux error code for @response.
42 */
43 int chsc_error_from_response(int response)
44 {
45 switch (response) {
46 case 0x0001:
47 return 0;
48 case 0x0002:
49 case 0x0003:
50 case 0x0006:
51 case 0x0007:
52 case 0x0008:
53 case 0x000a:
54 case 0x0104:
55 return -EINVAL;
56 case 0x0004:
57 return -EOPNOTSUPP;
58 case 0x000b:
59 case 0x0107: /* "Channel busy" for the op 0x003d */
60 return -EBUSY;
61 case 0x0100:
62 case 0x0102:
63 return -ENOMEM;
64 default:
65 return -EIO;
66 }
67 }
68 EXPORT_SYMBOL_GPL(chsc_error_from_response);
69
70 struct chsc_ssd_area {
71 struct chsc_header request;
72 u16 :10;
73 u16 ssid:2;
74 u16 :4;
75 u16 f_sch; /* first subchannel */
76 u16 :16;
77 u16 l_sch; /* last subchannel */
78 u32 :32;
79 struct chsc_header response;
80 u32 :32;
81 u8 sch_valid : 1;
82 u8 dev_valid : 1;
83 u8 st : 3; /* subchannel type */
84 u8 zeroes : 3;
85 u8 unit_addr; /* unit address */
86 u16 devno; /* device number */
87 u8 path_mask;
88 u8 fla_valid_mask;
89 u16 sch; /* subchannel */
90 u8 chpid[8]; /* chpids 0-7 */
91 u16 fla[8]; /* full link addresses 0-7 */
92 } __attribute__ ((packed));
93
94 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
95 {
96 struct chsc_ssd_area *ssd_area;
97 int ccode;
98 int ret;
99 int i;
100 int mask;
101
102 spin_lock_irq(&chsc_page_lock);
103 memset(chsc_page, 0, PAGE_SIZE);
104 ssd_area = chsc_page;
105 ssd_area->request.length = 0x0010;
106 ssd_area->request.code = 0x0004;
107 ssd_area->ssid = schid.ssid;
108 ssd_area->f_sch = schid.sch_no;
109 ssd_area->l_sch = schid.sch_no;
110
111 ccode = chsc(ssd_area);
112 /* Check response. */
113 if (ccode > 0) {
114 ret = (ccode == 3) ? -ENODEV : -EBUSY;
115 goto out;
116 }
117 ret = chsc_error_from_response(ssd_area->response.code);
118 if (ret != 0) {
119 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
120 schid.ssid, schid.sch_no,
121 ssd_area->response.code);
122 goto out;
123 }
124 if (!ssd_area->sch_valid) {
125 ret = -ENODEV;
126 goto out;
127 }
128 /* Copy data */
129 ret = 0;
130 memset(ssd, 0, sizeof(struct chsc_ssd_info));
131 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
132 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
133 goto out;
134 ssd->path_mask = ssd_area->path_mask;
135 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
136 for (i = 0; i < 8; i++) {
137 mask = 0x80 >> i;
138 if (ssd_area->path_mask & mask) {
139 chp_id_init(&ssd->chpid[i]);
140 ssd->chpid[i].id = ssd_area->chpid[i];
141 }
142 if (ssd_area->fla_valid_mask & mask)
143 ssd->fla[i] = ssd_area->fla[i];
144 }
145 out:
146 spin_unlock_irq(&chsc_page_lock);
147 return ret;
148 }
149
150 /**
151 * chsc_ssqd() - store subchannel QDIO data (SSQD)
152 * @schid: id of the subchannel on which SSQD is performed
153 * @ssqd: request and response block for SSQD
154 *
155 * Returns 0 on success.
156 */
157 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
158 {
159 memset(ssqd, 0, sizeof(*ssqd));
160 ssqd->request.length = 0x0010;
161 ssqd->request.code = 0x0024;
162 ssqd->first_sch = schid.sch_no;
163 ssqd->last_sch = schid.sch_no;
164 ssqd->ssid = schid.ssid;
165
166 if (chsc(ssqd))
167 return -EIO;
168
169 return chsc_error_from_response(ssqd->response.code);
170 }
171 EXPORT_SYMBOL_GPL(chsc_ssqd);
172
173 /**
174 * chsc_sadc() - set adapter device controls (SADC)
175 * @schid: id of the subchannel on which SADC is performed
176 * @scssc: request and response block for SADC
177 * @summary_indicator_addr: summary indicator address
178 * @subchannel_indicator_addr: subchannel indicator address
179 *
180 * Returns 0 on success.
181 */
182 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
183 u64 summary_indicator_addr, u64 subchannel_indicator_addr)
184 {
185 memset(scssc, 0, sizeof(*scssc));
186 scssc->request.length = 0x0fe0;
187 scssc->request.code = 0x0021;
188 scssc->operation_code = 0;
189
190 scssc->summary_indicator_addr = summary_indicator_addr;
191 scssc->subchannel_indicator_addr = subchannel_indicator_addr;
192
193 scssc->ks = PAGE_DEFAULT_KEY >> 4;
194 scssc->kc = PAGE_DEFAULT_KEY >> 4;
195 scssc->isc = QDIO_AIRQ_ISC;
196 scssc->schid = schid;
197
198 /* enable the time delay disablement facility */
199 if (css_general_characteristics.aif_tdd)
200 scssc->word_with_d_bit = 0x10000000;
201
202 if (chsc(scssc))
203 return -EIO;
204
205 return chsc_error_from_response(scssc->response.code);
206 }
207 EXPORT_SYMBOL_GPL(chsc_sadc);
208
209 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
210 {
211 spin_lock_irq(sch->lock);
212 if (sch->driver && sch->driver->chp_event)
213 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
214 goto out_unreg;
215 spin_unlock_irq(sch->lock);
216 return 0;
217
218 out_unreg:
219 sch->lpm = 0;
220 spin_unlock_irq(sch->lock);
221 css_schedule_eval(sch->schid);
222 return 0;
223 }
224
225 void chsc_chp_offline(struct chp_id chpid)
226 {
227 char dbf_txt[15];
228 struct chp_link link;
229
230 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
231 CIO_TRACE_EVENT(2, dbf_txt);
232
233 if (chp_get_status(chpid) <= 0)
234 return;
235 memset(&link, 0, sizeof(struct chp_link));
236 link.chpid = chpid;
237 /* Wait until previous actions have settled. */
238 css_wait_for_slow_path();
239 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
240 }
241
242 static int __s390_process_res_acc(struct subchannel *sch, void *data)
243 {
244 spin_lock_irq(sch->lock);
245 if (sch->driver && sch->driver->chp_event)
246 sch->driver->chp_event(sch, data, CHP_ONLINE);
247 spin_unlock_irq(sch->lock);
248
249 return 0;
250 }
251
252 static void s390_process_res_acc(struct chp_link *link)
253 {
254 char dbf_txt[15];
255
256 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
257 link->chpid.id);
258 CIO_TRACE_EVENT( 2, dbf_txt);
259 if (link->fla != 0) {
260 sprintf(dbf_txt, "fla%x", link->fla);
261 CIO_TRACE_EVENT( 2, dbf_txt);
262 }
263 /* Wait until previous actions have settled. */
264 css_wait_for_slow_path();
265 /*
266 * I/O resources may have become accessible.
267 * Scan through all subchannels that may be concerned and
268 * do a validation on those.
269 * The more information we have (info), the less scanning
270 * will we have to do.
271 */
272 for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
273 css_schedule_reprobe();
274 }
275
276 struct chsc_sei_nt0_area {
277 u8 flags;
278 u8 vf; /* validity flags */
279 u8 rs; /* reporting source */
280 u8 cc; /* content code */
281 u16 fla; /* full link address */
282 u16 rsid; /* reporting source id */
283 u32 reserved1;
284 u32 reserved2;
285 /* ccdf has to be big enough for a link-incident record */
286 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
287 } __packed;
288
289 struct chsc_sei_nt2_area {
290 u8 flags; /* p and v bit */
291 u8 reserved1;
292 u8 reserved2;
293 u8 cc; /* content code */
294 u32 reserved3[13];
295 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
296 } __packed;
297
298 #define CHSC_SEI_NT0 (1ULL << 63)
299 #define CHSC_SEI_NT2 (1ULL << 61)
300
301 struct chsc_sei {
302 struct chsc_header request;
303 u32 reserved1;
304 u64 ntsm; /* notification type mask */
305 struct chsc_header response;
306 u32 :24;
307 u8 nt;
308 union {
309 struct chsc_sei_nt0_area nt0_area;
310 struct chsc_sei_nt2_area nt2_area;
311 u8 nt_area[PAGE_SIZE - 24];
312 } u;
313 } __packed;
314
315 /*
316 * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
317 */
318
319 #define ND_VALIDITY_VALID 0
320 #define ND_VALIDITY_OUTDATED 1
321 #define ND_VALIDITY_INVALID 2
322
323 struct node_descriptor {
324 /* Flags. */
325 union {
326 struct {
327 u32 validity:3;
328 u32 reserved:5;
329 } __packed;
330 u8 byte0;
331 } __packed;
332
333 /* Node parameters. */
334 u32 params:24;
335
336 /* Node ID. */
337 char type[6];
338 char model[3];
339 char manufacturer[3];
340 char plant[2];
341 char seq[12];
342 u16 tag;
343 } __packed;
344
345 /*
346 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
347 */
348
349 #define LIR_IQ_CLASS_INFO 0
350 #define LIR_IQ_CLASS_DEGRADED 1
351 #define LIR_IQ_CLASS_NOT_OPERATIONAL 2
352
353 struct lir {
354 struct {
355 u32 null:1;
356 u32 reserved:3;
357 u32 class:2;
358 u32 reserved2:2;
359 } __packed iq;
360 u32 ic:8;
361 u32 reserved:16;
362 struct node_descriptor incident_node;
363 struct node_descriptor attached_node;
364 u8 reserved2[32];
365 } __packed;
366
367 #define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */
368 #define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
369
370 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
371 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
372 char delim)
373 {
374 memcpy(dest, src, len);
375 EBCASC(dest, len);
376
377 if (delim)
378 dest[len++] = delim;
379
380 return dest + len;
381 }
382
383 /* Format node ID and parameters for output in LIR log message. */
384 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
385 {
386 memset(params, 0, PARAMS_LEN);
387 memset(id, 0, NODEID_LEN);
388
389 if (nd->validity != ND_VALIDITY_VALID) {
390 strncpy(params, "n/a", PARAMS_LEN - 1);
391 strncpy(id, "n/a", NODEID_LEN - 1);
392 return;
393 }
394
395 /* PARAMS=xx,xxxxxx */
396 snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
397 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
398 id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
399 id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
400 id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
401 id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
402 id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
403 sprintf(id, "%04X", nd->tag);
404 }
405
406 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
407 {
408 struct lir *lir = (struct lir *) &sei_area->ccdf;
409 char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
410 aunodeid[NODEID_LEN];
411
412 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
413 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
414
415 /* Ignore NULL Link Incident Records. */
416 if (lir->iq.null)
417 return;
418
419 /* Inform user that a link requires maintenance actions because it has
420 * become degraded or not operational. Note that this log message is
421 * the primary intention behind a Link Incident Record. */
422
423 format_node_data(iuparams, iunodeid, &lir->incident_node);
424 format_node_data(auparams, aunodeid, &lir->attached_node);
425
426 switch (lir->iq.class) {
427 case LIR_IQ_CLASS_DEGRADED:
428 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
429 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
430 sei_area->rs, sei_area->rsid, lir->ic, iuparams,
431 iunodeid, auparams, aunodeid);
432 break;
433 case LIR_IQ_CLASS_NOT_OPERATIONAL:
434 pr_err("Link stopped: 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 default:
440 break;
441 }
442 }
443
444 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
445 {
446 struct chp_link link;
447 struct chp_id chpid;
448 int status;
449
450 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
451 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
452 if (sei_area->rs != 4)
453 return;
454 chp_id_init(&chpid);
455 chpid.id = sei_area->rsid;
456 /* allocate a new channel path structure, if needed */
457 status = chp_get_status(chpid);
458 if (status < 0)
459 chp_new(chpid);
460 else if (!status)
461 return;
462 memset(&link, 0, sizeof(struct chp_link));
463 link.chpid = chpid;
464 if ((sei_area->vf & 0xc0) != 0) {
465 link.fla = sei_area->fla;
466 if ((sei_area->vf & 0xc0) == 0xc0)
467 /* full link address */
468 link.fla_mask = 0xffff;
469 else
470 /* link address */
471 link.fla_mask = 0xff00;
472 }
473 s390_process_res_acc(&link);
474 }
475
476 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
477 {
478 struct channel_path *chp;
479 struct chp_id chpid;
480 u8 *data;
481 int num;
482
483 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
484 if (sei_area->rs != 0)
485 return;
486 data = sei_area->ccdf;
487 chp_id_init(&chpid);
488 for (num = 0; num <= __MAX_CHPID; num++) {
489 if (!chp_test_bit(data, num))
490 continue;
491 chpid.id = num;
492
493 CIO_CRW_EVENT(4, "Update information for channel path "
494 "%x.%02x\n", chpid.cssid, chpid.id);
495 chp = chpid_to_chp(chpid);
496 if (!chp) {
497 chp_new(chpid);
498 continue;
499 }
500 mutex_lock(&chp->lock);
501 chp_update_desc(chp);
502 mutex_unlock(&chp->lock);
503 }
504 }
505
506 struct chp_config_data {
507 u8 map[32];
508 u8 op;
509 u8 pc;
510 };
511
512 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
513 {
514 struct chp_config_data *data;
515 struct chp_id chpid;
516 int num;
517 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
518
519 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
520 if (sei_area->rs != 0)
521 return;
522 data = (struct chp_config_data *) &(sei_area->ccdf);
523 chp_id_init(&chpid);
524 for (num = 0; num <= __MAX_CHPID; num++) {
525 if (!chp_test_bit(data->map, num))
526 continue;
527 chpid.id = num;
528 pr_notice("Processing %s for channel path %x.%02x\n",
529 events[data->op], chpid.cssid, chpid.id);
530 switch (data->op) {
531 case 0:
532 chp_cfg_schedule(chpid, 1);
533 break;
534 case 1:
535 chp_cfg_schedule(chpid, 0);
536 break;
537 case 2:
538 chp_cfg_cancel_deconfigure(chpid);
539 break;
540 }
541 }
542 }
543
544 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
545 {
546 int ret;
547
548 CIO_CRW_EVENT(4, "chsc: scm change notification\n");
549 if (sei_area->rs != 7)
550 return;
551
552 ret = scm_update_information();
553 if (ret)
554 CIO_CRW_EVENT(0, "chsc: updating change notification"
555 " failed (rc=%d).\n", ret);
556 }
557
558 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
559 {
560 int ret;
561
562 CIO_CRW_EVENT(4, "chsc: scm available information\n");
563 if (sei_area->rs != 7)
564 return;
565
566 ret = scm_process_availability_information();
567 if (ret)
568 CIO_CRW_EVENT(0, "chsc: process availability information"
569 " failed (rc=%d).\n", ret);
570 }
571
572 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
573 {
574 switch (sei_area->cc) {
575 case 1:
576 zpci_event_error(sei_area->ccdf);
577 break;
578 case 2:
579 zpci_event_availability(sei_area->ccdf);
580 break;
581 default:
582 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
583 sei_area->cc);
584 break;
585 }
586 }
587
588 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
589 {
590 /* which kind of information was stored? */
591 switch (sei_area->cc) {
592 case 1: /* link incident*/
593 chsc_process_sei_link_incident(sei_area);
594 break;
595 case 2: /* i/o resource accessibility */
596 chsc_process_sei_res_acc(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
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 */
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
691 void chsc_chp_online(struct chp_id chpid)
692 {
693 char dbf_txt[15];
694 struct chp_link link;
695
696 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
697 CIO_TRACE_EVENT(2, dbf_txt);
698
699 if (chp_get_status(chpid) != 0) {
700 memset(&link, 0, sizeof(struct chp_link));
701 link.chpid = chpid;
702 /* Wait until previous actions have settled. */
703 css_wait_for_slow_path();
704 for_each_subchannel_staged(__s390_process_res_acc, NULL,
705 &link);
706 css_schedule_reprobe();
707 }
708 }
709
710 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
711 struct chp_id chpid, int on)
712 {
713 unsigned long flags;
714 struct chp_link link;
715
716 memset(&link, 0, sizeof(struct chp_link));
717 link.chpid = chpid;
718 spin_lock_irqsave(sch->lock, flags);
719 if (sch->driver && sch->driver->chp_event)
720 sch->driver->chp_event(sch, &link,
721 on ? CHP_VARY_ON : CHP_VARY_OFF);
722 spin_unlock_irqrestore(sch->lock, flags);
723 }
724
725 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
726 {
727 struct chp_id *chpid = data;
728
729 __s390_subchannel_vary_chpid(sch, *chpid, 0);
730 return 0;
731 }
732
733 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
734 {
735 struct chp_id *chpid = data;
736
737 __s390_subchannel_vary_chpid(sch, *chpid, 1);
738 return 0;
739 }
740
741 /**
742 * chsc_chp_vary - propagate channel-path vary operation to subchannels
743 * @chpid: channl-path ID
744 * @on: non-zero for vary online, zero for vary offline
745 */
746 int chsc_chp_vary(struct chp_id chpid, int on)
747 {
748 struct channel_path *chp = chpid_to_chp(chpid);
749
750 /* Wait until previous actions have settled. */
751 css_wait_for_slow_path();
752 /*
753 * Redo PathVerification on the devices the chpid connects to
754 */
755 if (on) {
756 /* Try to update the channel path description. */
757 chp_update_desc(chp);
758 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
759 NULL, &chpid);
760 css_schedule_reprobe();
761 } else
762 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
763 NULL, &chpid);
764
765 return 0;
766 }
767
768 static void
769 chsc_remove_cmg_attr(struct channel_subsystem *css)
770 {
771 int i;
772
773 for (i = 0; i <= __MAX_CHPID; i++) {
774 if (!css->chps[i])
775 continue;
776 chp_remove_cmg_attr(css->chps[i]);
777 }
778 }
779
780 static int
781 chsc_add_cmg_attr(struct channel_subsystem *css)
782 {
783 int i, ret;
784
785 ret = 0;
786 for (i = 0; i <= __MAX_CHPID; i++) {
787 if (!css->chps[i])
788 continue;
789 ret = chp_add_cmg_attr(css->chps[i]);
790 if (ret)
791 goto cleanup;
792 }
793 return ret;
794 cleanup:
795 for (--i; i >= 0; i--) {
796 if (!css->chps[i])
797 continue;
798 chp_remove_cmg_attr(css->chps[i]);
799 }
800 return ret;
801 }
802
803 int __chsc_do_secm(struct channel_subsystem *css, int enable)
804 {
805 struct {
806 struct chsc_header request;
807 u32 operation_code : 2;
808 u32 : 30;
809 u32 key : 4;
810 u32 : 28;
811 u32 zeroes1;
812 u32 cub_addr1;
813 u32 zeroes2;
814 u32 cub_addr2;
815 u32 reserved[13];
816 struct chsc_header response;
817 u32 status : 8;
818 u32 : 4;
819 u32 fmt : 4;
820 u32 : 16;
821 } __attribute__ ((packed)) *secm_area;
822 int ret, ccode;
823
824 spin_lock_irq(&chsc_page_lock);
825 memset(chsc_page, 0, PAGE_SIZE);
826 secm_area = chsc_page;
827 secm_area->request.length = 0x0050;
828 secm_area->request.code = 0x0016;
829
830 secm_area->key = PAGE_DEFAULT_KEY >> 4;
831 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
832 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
833
834 secm_area->operation_code = enable ? 0 : 1;
835
836 ccode = chsc(secm_area);
837 if (ccode > 0) {
838 ret = (ccode == 3) ? -ENODEV : -EBUSY;
839 goto out;
840 }
841
842 switch (secm_area->response.code) {
843 case 0x0102:
844 case 0x0103:
845 ret = -EINVAL;
846 break;
847 default:
848 ret = chsc_error_from_response(secm_area->response.code);
849 }
850 if (ret != 0)
851 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
852 secm_area->response.code);
853 out:
854 spin_unlock_irq(&chsc_page_lock);
855 return ret;
856 }
857
858 int
859 chsc_secm(struct channel_subsystem *css, int enable)
860 {
861 int ret;
862
863 if (enable && !css->cm_enabled) {
864 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
865 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
866 if (!css->cub_addr1 || !css->cub_addr2) {
867 free_page((unsigned long)css->cub_addr1);
868 free_page((unsigned long)css->cub_addr2);
869 return -ENOMEM;
870 }
871 }
872 ret = __chsc_do_secm(css, enable);
873 if (!ret) {
874 css->cm_enabled = enable;
875 if (css->cm_enabled) {
876 ret = chsc_add_cmg_attr(css);
877 if (ret) {
878 __chsc_do_secm(css, 0);
879 css->cm_enabled = 0;
880 }
881 } else
882 chsc_remove_cmg_attr(css);
883 }
884 if (!css->cm_enabled) {
885 free_page((unsigned long)css->cub_addr1);
886 free_page((unsigned long)css->cub_addr2);
887 }
888 return ret;
889 }
890
891 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
892 int c, int m, void *page)
893 {
894 struct chsc_scpd *scpd_area;
895 int ccode, ret;
896
897 if ((rfmt == 1) && !css_general_characteristics.fcs)
898 return -EINVAL;
899 if ((rfmt == 2) && !css_general_characteristics.cib)
900 return -EINVAL;
901
902 memset(page, 0, PAGE_SIZE);
903 scpd_area = page;
904 scpd_area->request.length = 0x0010;
905 scpd_area->request.code = 0x0002;
906 scpd_area->cssid = chpid.cssid;
907 scpd_area->first_chpid = chpid.id;
908 scpd_area->last_chpid = chpid.id;
909 scpd_area->m = m;
910 scpd_area->c = c;
911 scpd_area->fmt = fmt;
912 scpd_area->rfmt = rfmt;
913
914 ccode = chsc(scpd_area);
915 if (ccode > 0)
916 return (ccode == 3) ? -ENODEV : -EBUSY;
917
918 ret = chsc_error_from_response(scpd_area->response.code);
919 if (ret)
920 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
921 scpd_area->response.code);
922 return ret;
923 }
924 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
925
926 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
927 struct channel_path_desc *desc)
928 {
929 struct chsc_response_struct *chsc_resp;
930 struct chsc_scpd *scpd_area;
931 unsigned long flags;
932 int ret;
933
934 spin_lock_irqsave(&chsc_page_lock, flags);
935 scpd_area = chsc_page;
936 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
937 if (ret)
938 goto out;
939 chsc_resp = (void *)&scpd_area->response;
940 memcpy(desc, &chsc_resp->data, sizeof(*desc));
941 out:
942 spin_unlock_irqrestore(&chsc_page_lock, flags);
943 return ret;
944 }
945
946 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
947 struct channel_path_desc_fmt1 *desc)
948 {
949 struct chsc_response_struct *chsc_resp;
950 struct chsc_scpd *scpd_area;
951 unsigned long flags;
952 int ret;
953
954 spin_lock_irqsave(&chsc_page_lock, flags);
955 scpd_area = chsc_page;
956 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
957 if (ret)
958 goto out;
959 chsc_resp = (void *)&scpd_area->response;
960 memcpy(desc, &chsc_resp->data, sizeof(*desc));
961 out:
962 spin_unlock_irqrestore(&chsc_page_lock, flags);
963 return ret;
964 }
965
966 static void
967 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
968 struct cmg_chars *chars)
969 {
970 struct cmg_chars *cmg_chars;
971 int i, mask;
972
973 cmg_chars = chp->cmg_chars;
974 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
975 mask = 0x80 >> (i + 3);
976 if (cmcv & mask)
977 cmg_chars->values[i] = chars->values[i];
978 else
979 cmg_chars->values[i] = 0;
980 }
981 }
982
983 int chsc_get_channel_measurement_chars(struct channel_path *chp)
984 {
985 struct cmg_chars *cmg_chars;
986 int ccode, ret;
987
988 struct {
989 struct chsc_header request;
990 u32 : 24;
991 u32 first_chpid : 8;
992 u32 : 24;
993 u32 last_chpid : 8;
994 u32 zeroes1;
995 struct chsc_header response;
996 u32 zeroes2;
997 u32 not_valid : 1;
998 u32 shared : 1;
999 u32 : 22;
1000 u32 chpid : 8;
1001 u32 cmcv : 5;
1002 u32 : 11;
1003 u32 cmgq : 8;
1004 u32 cmg : 8;
1005 u32 zeroes3;
1006 u32 data[NR_MEASUREMENT_CHARS];
1007 } __attribute__ ((packed)) *scmc_area;
1008
1009 chp->cmg_chars = NULL;
1010 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
1011 if (!cmg_chars)
1012 return -ENOMEM;
1013
1014 spin_lock_irq(&chsc_page_lock);
1015 memset(chsc_page, 0, PAGE_SIZE);
1016 scmc_area = chsc_page;
1017 scmc_area->request.length = 0x0010;
1018 scmc_area->request.code = 0x0022;
1019 scmc_area->first_chpid = chp->chpid.id;
1020 scmc_area->last_chpid = chp->chpid.id;
1021
1022 ccode = chsc(scmc_area);
1023 if (ccode > 0) {
1024 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1025 goto out;
1026 }
1027
1028 ret = chsc_error_from_response(scmc_area->response.code);
1029 if (ret) {
1030 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1031 scmc_area->response.code);
1032 goto out;
1033 }
1034 if (scmc_area->not_valid) {
1035 chp->cmg = -1;
1036 chp->shared = -1;
1037 goto out;
1038 }
1039 chp->cmg = scmc_area->cmg;
1040 chp->shared = scmc_area->shared;
1041 if (chp->cmg != 2 && chp->cmg != 3) {
1042 /* No cmg-dependent data. */
1043 goto out;
1044 }
1045 chp->cmg_chars = cmg_chars;
1046 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1047 (struct cmg_chars *) &scmc_area->data);
1048 out:
1049 spin_unlock_irq(&chsc_page_lock);
1050 if (!chp->cmg_chars)
1051 kfree(cmg_chars);
1052
1053 return ret;
1054 }
1055
1056 int __init chsc_init(void)
1057 {
1058 int ret;
1059
1060 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1061 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1062 if (!sei_page || !chsc_page) {
1063 ret = -ENOMEM;
1064 goto out_err;
1065 }
1066 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1067 if (ret)
1068 goto out_err;
1069 return ret;
1070 out_err:
1071 free_page((unsigned long)chsc_page);
1072 free_page((unsigned long)sei_page);
1073 return ret;
1074 }
1075
1076 void __init chsc_init_cleanup(void)
1077 {
1078 crw_unregister_handler(CRW_RSC_CSS);
1079 free_page((unsigned long)chsc_page);
1080 free_page((unsigned long)sei_page);
1081 }
1082
1083 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1084 {
1085 int ret;
1086
1087 sda_area->request.length = 0x0400;
1088 sda_area->request.code = 0x0031;
1089 sda_area->operation_code = operation_code;
1090
1091 ret = chsc(sda_area);
1092 if (ret > 0) {
1093 ret = (ret == 3) ? -ENODEV : -EBUSY;
1094 goto out;
1095 }
1096
1097 switch (sda_area->response.code) {
1098 case 0x0101:
1099 ret = -EOPNOTSUPP;
1100 break;
1101 default:
1102 ret = chsc_error_from_response(sda_area->response.code);
1103 }
1104 out:
1105 return ret;
1106 }
1107
1108 int chsc_enable_facility(int operation_code)
1109 {
1110 struct chsc_sda_area *sda_area;
1111 unsigned long flags;
1112 int ret;
1113
1114 spin_lock_irqsave(&chsc_page_lock, flags);
1115 memset(chsc_page, 0, PAGE_SIZE);
1116 sda_area = chsc_page;
1117
1118 ret = __chsc_enable_facility(sda_area, operation_code);
1119 if (ret != 0)
1120 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1121 operation_code, sda_area->response.code);
1122
1123 spin_unlock_irqrestore(&chsc_page_lock, flags);
1124 return ret;
1125 }
1126
1127 struct css_general_char css_general_characteristics;
1128 struct css_chsc_char css_chsc_characteristics;
1129
1130 int __init
1131 chsc_determine_css_characteristics(void)
1132 {
1133 int result;
1134 struct {
1135 struct chsc_header request;
1136 u32 reserved1;
1137 u32 reserved2;
1138 u32 reserved3;
1139 struct chsc_header response;
1140 u32 reserved4;
1141 u32 general_char[510];
1142 u32 chsc_char[508];
1143 } __attribute__ ((packed)) *scsc_area;
1144
1145 spin_lock_irq(&chsc_page_lock);
1146 memset(chsc_page, 0, PAGE_SIZE);
1147 scsc_area = chsc_page;
1148 scsc_area->request.length = 0x0010;
1149 scsc_area->request.code = 0x0010;
1150
1151 result = chsc(scsc_area);
1152 if (result) {
1153 result = (result == 3) ? -ENODEV : -EBUSY;
1154 goto exit;
1155 }
1156
1157 result = chsc_error_from_response(scsc_area->response.code);
1158 if (result == 0) {
1159 memcpy(&css_general_characteristics, scsc_area->general_char,
1160 sizeof(css_general_characteristics));
1161 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1162 sizeof(css_chsc_characteristics));
1163 } else
1164 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1165 scsc_area->response.code);
1166 exit:
1167 spin_unlock_irq(&chsc_page_lock);
1168 return result;
1169 }
1170
1171 EXPORT_SYMBOL_GPL(css_general_characteristics);
1172 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1173
1174 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1175 {
1176 struct {
1177 struct chsc_header request;
1178 unsigned int rsvd0;
1179 unsigned int op : 8;
1180 unsigned int rsvd1 : 8;
1181 unsigned int ctrl : 16;
1182 unsigned int rsvd2[5];
1183 struct chsc_header response;
1184 unsigned int rsvd3[7];
1185 } __attribute__ ((packed)) *rr;
1186 int rc;
1187
1188 memset(page, 0, PAGE_SIZE);
1189 rr = page;
1190 rr->request.length = 0x0020;
1191 rr->request.code = 0x0033;
1192 rr->op = op;
1193 rr->ctrl = ctrl;
1194 rc = chsc(rr);
1195 if (rc)
1196 return -EIO;
1197 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1198 return rc;
1199 }
1200
1201 int chsc_sstpi(void *page, void *result, size_t size)
1202 {
1203 struct {
1204 struct chsc_header request;
1205 unsigned int rsvd0[3];
1206 struct chsc_header response;
1207 char data[size];
1208 } __attribute__ ((packed)) *rr;
1209 int rc;
1210
1211 memset(page, 0, PAGE_SIZE);
1212 rr = page;
1213 rr->request.length = 0x0010;
1214 rr->request.code = 0x0038;
1215 rc = chsc(rr);
1216 if (rc)
1217 return -EIO;
1218 memcpy(result, &rr->data, size);
1219 return (rr->response.code == 0x0001) ? 0 : -EIO;
1220 }
1221
1222 int chsc_siosl(struct subchannel_id schid)
1223 {
1224 struct {
1225 struct chsc_header request;
1226 u32 word1;
1227 struct subchannel_id sid;
1228 u32 word3;
1229 struct chsc_header response;
1230 u32 word[11];
1231 } __attribute__ ((packed)) *siosl_area;
1232 unsigned long flags;
1233 int ccode;
1234 int rc;
1235
1236 spin_lock_irqsave(&chsc_page_lock, flags);
1237 memset(chsc_page, 0, PAGE_SIZE);
1238 siosl_area = chsc_page;
1239 siosl_area->request.length = 0x0010;
1240 siosl_area->request.code = 0x0046;
1241 siosl_area->word1 = 0x80000000;
1242 siosl_area->sid = schid;
1243
1244 ccode = chsc(siosl_area);
1245 if (ccode > 0) {
1246 if (ccode == 3)
1247 rc = -ENODEV;
1248 else
1249 rc = -EBUSY;
1250 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1251 schid.ssid, schid.sch_no, ccode);
1252 goto out;
1253 }
1254 rc = chsc_error_from_response(siosl_area->response.code);
1255 if (rc)
1256 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1257 schid.ssid, schid.sch_no,
1258 siosl_area->response.code);
1259 else
1260 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1261 schid.ssid, schid.sch_no);
1262 out:
1263 spin_unlock_irqrestore(&chsc_page_lock, flags);
1264 return rc;
1265 }
1266 EXPORT_SYMBOL_GPL(chsc_siosl);
1267
1268 /**
1269 * chsc_scm_info() - store SCM information (SSI)
1270 * @scm_area: request and response block for SSI
1271 * @token: continuation token
1272 *
1273 * Returns 0 on success.
1274 */
1275 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1276 {
1277 int ccode, ret;
1278
1279 memset(scm_area, 0, sizeof(*scm_area));
1280 scm_area->request.length = 0x0020;
1281 scm_area->request.code = 0x004C;
1282 scm_area->reqtok = token;
1283
1284 ccode = chsc(scm_area);
1285 if (ccode > 0) {
1286 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1287 goto out;
1288 }
1289 ret = chsc_error_from_response(scm_area->response.code);
1290 if (ret != 0)
1291 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1292 scm_area->response.code);
1293 out:
1294 return ret;
1295 }
1296 EXPORT_SYMBOL_GPL(chsc_scm_info);
1297
1298 /**
1299 * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1300 * @schid: id of the subchannel on which PNSO is performed
1301 * @brinfo_area: request and response block for the operation
1302 * @resume_token: resume token for multiblock response
1303 * @cnc: Boolean change-notification control
1304 *
1305 * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1306 *
1307 * Returns 0 on success.
1308 */
1309 int chsc_pnso_brinfo(struct subchannel_id schid,
1310 struct chsc_pnso_area *brinfo_area,
1311 struct chsc_brinfo_resume_token resume_token,
1312 int cnc)
1313 {
1314 memset(brinfo_area, 0, sizeof(*brinfo_area));
1315 brinfo_area->request.length = 0x0030;
1316 brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1317 brinfo_area->m = schid.m;
1318 brinfo_area->ssid = schid.ssid;
1319 brinfo_area->sch = schid.sch_no;
1320 brinfo_area->cssid = schid.cssid;
1321 brinfo_area->oc = 0; /* Store-network-bridging-information list */
1322 brinfo_area->resume_token = resume_token;
1323 brinfo_area->n = (cnc != 0);
1324 if (chsc(brinfo_area))
1325 return -EIO;
1326 return chsc_error_from_response(brinfo_area->response.code);
1327 }
1328 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);
(deprecated) Btrfs devel tree