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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / s390 / cio / chsc.c
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
24 #include "css.h"
25 #include "cio.h"
26 #include "cio_debug.h"
27 #include "ioasm.h"
28 #include "chp.h"
29 #include "chsc.h"
30
31 static void *sei_page;
32 static void *chsc_page;
33 static DEFINE_SPINLOCK(chsc_page_lock);
34
35 /**
36 * chsc_error_from_response() - convert a chsc response to an error
37 * @response: chsc response code
38 *
39 * Returns an appropriate Linux error code for @response.
40 */
41 int chsc_error_from_response(int response)
42 {
43 switch (response) {
44 case 0x0001:
45 return 0;
46 case 0x0002:
47 case 0x0003:
48 case 0x0006:
49 case 0x0007:
50 case 0x0008:
51 case 0x000a:
52 case 0x0104:
53 return -EINVAL;
54 case 0x0004:
55 return -EOPNOTSUPP;
56 case 0x000b:
57 return -EBUSY;
58 case 0x0100:
59 case 0x0102:
60 return -ENOMEM;
61 default:
62 return -EIO;
63 }
64 }
65 EXPORT_SYMBOL_GPL(chsc_error_from_response);
66
67 struct chsc_ssd_area {
68 struct chsc_header request;
69 u16 :10;
70 u16 ssid:2;
71 u16 :4;
72 u16 f_sch; /* first subchannel */
73 u16 :16;
74 u16 l_sch; /* last subchannel */
75 u32 :32;
76 struct chsc_header response;
77 u32 :32;
78 u8 sch_valid : 1;
79 u8 dev_valid : 1;
80 u8 st : 3; /* subchannel type */
81 u8 zeroes : 3;
82 u8 unit_addr; /* unit address */
83 u16 devno; /* device number */
84 u8 path_mask;
85 u8 fla_valid_mask;
86 u16 sch; /* subchannel */
87 u8 chpid[8]; /* chpids 0-7 */
88 u16 fla[8]; /* full link addresses 0-7 */
89 } __attribute__ ((packed));
90
91 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
92 {
93 struct chsc_ssd_area *ssd_area;
94 int ccode;
95 int ret;
96 int i;
97 int mask;
98
99 spin_lock_irq(&chsc_page_lock);
100 memset(chsc_page, 0, PAGE_SIZE);
101 ssd_area = chsc_page;
102 ssd_area->request.length = 0x0010;
103 ssd_area->request.code = 0x0004;
104 ssd_area->ssid = schid.ssid;
105 ssd_area->f_sch = schid.sch_no;
106 ssd_area->l_sch = schid.sch_no;
107
108 ccode = chsc(ssd_area);
109 /* Check response. */
110 if (ccode > 0) {
111 ret = (ccode == 3) ? -ENODEV : -EBUSY;
112 goto out;
113 }
114 ret = chsc_error_from_response(ssd_area->response.code);
115 if (ret != 0) {
116 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
117 schid.ssid, schid.sch_no,
118 ssd_area->response.code);
119 goto out;
120 }
121 if (!ssd_area->sch_valid) {
122 ret = -ENODEV;
123 goto out;
124 }
125 /* Copy data */
126 ret = 0;
127 memset(ssd, 0, sizeof(struct chsc_ssd_info));
128 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
129 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
130 goto out;
131 ssd->path_mask = ssd_area->path_mask;
132 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
133 for (i = 0; i < 8; i++) {
134 mask = 0x80 >> i;
135 if (ssd_area->path_mask & mask) {
136 chp_id_init(&ssd->chpid[i]);
137 ssd->chpid[i].id = ssd_area->chpid[i];
138 }
139 if (ssd_area->fla_valid_mask & mask)
140 ssd->fla[i] = ssd_area->fla[i];
141 }
142 out:
143 spin_unlock_irq(&chsc_page_lock);
144 return ret;
145 }
146
147 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
148 {
149 spin_lock_irq(sch->lock);
150 if (sch->driver && sch->driver->chp_event)
151 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
152 goto out_unreg;
153 spin_unlock_irq(sch->lock);
154 return 0;
155
156 out_unreg:
157 sch->lpm = 0;
158 spin_unlock_irq(sch->lock);
159 css_schedule_eval(sch->schid);
160 return 0;
161 }
162
163 void chsc_chp_offline(struct chp_id chpid)
164 {
165 char dbf_txt[15];
166 struct chp_link link;
167
168 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
169 CIO_TRACE_EVENT(2, dbf_txt);
170
171 if (chp_get_status(chpid) <= 0)
172 return;
173 memset(&link, 0, sizeof(struct chp_link));
174 link.chpid = chpid;
175 /* Wait until previous actions have settled. */
176 css_wait_for_slow_path();
177 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
178 }
179
180 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
181 {
182 struct schib schib;
183 /*
184 * We don't know the device yet, but since a path
185 * may be available now to the device we'll have
186 * to do recognition again.
187 * Since we don't have any idea about which chpid
188 * that beast may be on we'll have to do a stsch
189 * on all devices, grr...
190 */
191 if (stsch_err(schid, &schib))
192 /* We're through */
193 return -ENXIO;
194
195 /* Put it on the slow path. */
196 css_schedule_eval(schid);
197 return 0;
198 }
199
200 static int __s390_process_res_acc(struct subchannel *sch, void *data)
201 {
202 spin_lock_irq(sch->lock);
203 if (sch->driver && sch->driver->chp_event)
204 sch->driver->chp_event(sch, data, CHP_ONLINE);
205 spin_unlock_irq(sch->lock);
206
207 return 0;
208 }
209
210 static void s390_process_res_acc(struct chp_link *link)
211 {
212 char dbf_txt[15];
213
214 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
215 link->chpid.id);
216 CIO_TRACE_EVENT( 2, dbf_txt);
217 if (link->fla != 0) {
218 sprintf(dbf_txt, "fla%x", link->fla);
219 CIO_TRACE_EVENT( 2, dbf_txt);
220 }
221 /* Wait until previous actions have settled. */
222 css_wait_for_slow_path();
223 /*
224 * I/O resources may have become accessible.
225 * Scan through all subchannels that may be concerned and
226 * do a validation on those.
227 * The more information we have (info), the less scanning
228 * will we have to do.
229 */
230 for_each_subchannel_staged(__s390_process_res_acc,
231 s390_process_res_acc_new_sch, link);
232 }
233
234 static int
235 __get_chpid_from_lir(void *data)
236 {
237 struct lir {
238 u8 iq;
239 u8 ic;
240 u16 sci;
241 /* incident-node descriptor */
242 u32 indesc[28];
243 /* attached-node descriptor */
244 u32 andesc[28];
245 /* incident-specific information */
246 u32 isinfo[28];
247 } __attribute__ ((packed)) *lir;
248
249 lir = data;
250 if (!(lir->iq&0x80))
251 /* NULL link incident record */
252 return -EINVAL;
253 if (!(lir->indesc[0]&0xc0000000))
254 /* node descriptor not valid */
255 return -EINVAL;
256 if (!(lir->indesc[0]&0x10000000))
257 /* don't handle device-type nodes - FIXME */
258 return -EINVAL;
259 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
260
261 return (u16) (lir->indesc[0]&0x000000ff);
262 }
263
264 struct chsc_sei_nt0_area {
265 u8 flags;
266 u8 vf; /* validity flags */
267 u8 rs; /* reporting source */
268 u8 cc; /* content code */
269 u16 fla; /* full link address */
270 u16 rsid; /* reporting source id */
271 u32 reserved1;
272 u32 reserved2;
273 /* ccdf has to be big enough for a link-incident record */
274 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
275 } __packed;
276
277 struct chsc_sei_nt2_area {
278 u8 flags; /* p and v bit */
279 u8 reserved1;
280 u8 reserved2;
281 u8 cc; /* content code */
282 u32 reserved3[13];
283 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
284 } __packed;
285
286 #define CHSC_SEI_NT0 (1ULL << 63)
287 #define CHSC_SEI_NT2 (1ULL << 61)
288
289 struct chsc_sei {
290 struct chsc_header request;
291 u32 reserved1;
292 u64 ntsm; /* notification type mask */
293 struct chsc_header response;
294 u32 :24;
295 u8 nt;
296 union {
297 struct chsc_sei_nt0_area nt0_area;
298 struct chsc_sei_nt2_area nt2_area;
299 u8 nt_area[PAGE_SIZE - 24];
300 } u;
301 } __packed;
302
303 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
304 {
305 struct chp_id chpid;
306 int id;
307
308 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
309 sei_area->rs, sei_area->rsid);
310 if (sei_area->rs != 4)
311 return;
312 id = __get_chpid_from_lir(sei_area->ccdf);
313 if (id < 0)
314 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
315 else {
316 chp_id_init(&chpid);
317 chpid.id = id;
318 chsc_chp_offline(chpid);
319 }
320 }
321
322 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
323 {
324 struct chp_link link;
325 struct chp_id chpid;
326 int status;
327
328 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
329 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
330 if (sei_area->rs != 4)
331 return;
332 chp_id_init(&chpid);
333 chpid.id = sei_area->rsid;
334 /* allocate a new channel path structure, if needed */
335 status = chp_get_status(chpid);
336 if (status < 0)
337 chp_new(chpid);
338 else if (!status)
339 return;
340 memset(&link, 0, sizeof(struct chp_link));
341 link.chpid = chpid;
342 if ((sei_area->vf & 0xc0) != 0) {
343 link.fla = sei_area->fla;
344 if ((sei_area->vf & 0xc0) == 0xc0)
345 /* full link address */
346 link.fla_mask = 0xffff;
347 else
348 /* link address */
349 link.fla_mask = 0xff00;
350 }
351 s390_process_res_acc(&link);
352 }
353
354 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
355 {
356 struct channel_path *chp;
357 struct chp_id chpid;
358 u8 *data;
359 int num;
360
361 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
362 if (sei_area->rs != 0)
363 return;
364 data = sei_area->ccdf;
365 chp_id_init(&chpid);
366 for (num = 0; num <= __MAX_CHPID; num++) {
367 if (!chp_test_bit(data, num))
368 continue;
369 chpid.id = num;
370
371 CIO_CRW_EVENT(4, "Update information for channel path "
372 "%x.%02x\n", chpid.cssid, chpid.id);
373 chp = chpid_to_chp(chpid);
374 if (!chp) {
375 chp_new(chpid);
376 continue;
377 }
378 mutex_lock(&chp->lock);
379 chp_update_desc(chp);
380 mutex_unlock(&chp->lock);
381 }
382 }
383
384 struct chp_config_data {
385 u8 map[32];
386 u8 op;
387 u8 pc;
388 };
389
390 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
391 {
392 struct chp_config_data *data;
393 struct chp_id chpid;
394 int num;
395 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
396
397 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
398 if (sei_area->rs != 0)
399 return;
400 data = (struct chp_config_data *) &(sei_area->ccdf);
401 chp_id_init(&chpid);
402 for (num = 0; num <= __MAX_CHPID; num++) {
403 if (!chp_test_bit(data->map, num))
404 continue;
405 chpid.id = num;
406 pr_notice("Processing %s for channel path %x.%02x\n",
407 events[data->op], chpid.cssid, chpid.id);
408 switch (data->op) {
409 case 0:
410 chp_cfg_schedule(chpid, 1);
411 break;
412 case 1:
413 chp_cfg_schedule(chpid, 0);
414 break;
415 case 2:
416 chp_cfg_cancel_deconfigure(chpid);
417 break;
418 }
419 }
420 }
421
422 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
423 {
424 int ret;
425
426 CIO_CRW_EVENT(4, "chsc: scm change notification\n");
427 if (sei_area->rs != 7)
428 return;
429
430 ret = scm_update_information();
431 if (ret)
432 CIO_CRW_EVENT(0, "chsc: updating change notification"
433 " failed (rc=%d).\n", ret);
434 }
435
436 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
437 {
438 int ret;
439
440 CIO_CRW_EVENT(4, "chsc: scm available information\n");
441 if (sei_area->rs != 7)
442 return;
443
444 ret = scm_process_availability_information();
445 if (ret)
446 CIO_CRW_EVENT(0, "chsc: process availability information"
447 " failed (rc=%d).\n", ret);
448 }
449
450 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
451 {
452 switch (sei_area->cc) {
453 case 1:
454 zpci_event_error(sei_area->ccdf);
455 break;
456 case 2:
457 zpci_event_availability(sei_area->ccdf);
458 break;
459 default:
460 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
461 sei_area->cc);
462 break;
463 }
464 }
465
466 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
467 {
468 /* which kind of information was stored? */
469 switch (sei_area->cc) {
470 case 1: /* link incident*/
471 chsc_process_sei_link_incident(sei_area);
472 break;
473 case 2: /* i/o resource accessibility */
474 chsc_process_sei_res_acc(sei_area);
475 break;
476 case 7: /* channel-path-availability information */
477 chsc_process_sei_chp_avail(sei_area);
478 break;
479 case 8: /* channel-path-configuration notification */
480 chsc_process_sei_chp_config(sei_area);
481 break;
482 case 12: /* scm change notification */
483 chsc_process_sei_scm_change(sei_area);
484 break;
485 case 14: /* scm available notification */
486 chsc_process_sei_scm_avail(sei_area);
487 break;
488 default: /* other stuff */
489 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
490 sei_area->cc);
491 break;
492 }
493
494 /* Check if we might have lost some information. */
495 if (sei_area->flags & 0x40) {
496 CIO_CRW_EVENT(2, "chsc: event overflow\n");
497 css_schedule_eval_all();
498 }
499 }
500
501 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
502 {
503 static int ntsm_unsupported;
504
505 while (true) {
506 memset(sei, 0, sizeof(*sei));
507 sei->request.length = 0x0010;
508 sei->request.code = 0x000e;
509 if (!ntsm_unsupported)
510 sei->ntsm = ntsm;
511
512 if (chsc(sei))
513 break;
514
515 if (sei->response.code != 0x0001) {
516 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
517 sei->response.code, sei->ntsm);
518
519 if (sei->response.code == 3 && sei->ntsm) {
520 /* Fallback for old firmware. */
521 ntsm_unsupported = 1;
522 continue;
523 }
524 break;
525 }
526
527 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
528 switch (sei->nt) {
529 case 0:
530 chsc_process_sei_nt0(&sei->u.nt0_area);
531 break;
532 case 2:
533 chsc_process_sei_nt2(&sei->u.nt2_area);
534 break;
535 default:
536 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
537 break;
538 }
539
540 if (!(sei->u.nt0_area.flags & 0x80))
541 break;
542 }
543 }
544
545 /*
546 * Handle channel subsystem related CRWs.
547 * Use store event information to find out what's going on.
548 *
549 * Note: Access to sei_page is serialized through machine check handler
550 * thread, so no need for locking.
551 */
552 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
553 {
554 struct chsc_sei *sei = sei_page;
555
556 if (overflow) {
557 css_schedule_eval_all();
558 return;
559 }
560 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
561 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
562 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
563 crw0->erc, crw0->rsid);
564
565 CIO_TRACE_EVENT(2, "prcss");
566 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
567 }
568
569 void chsc_chp_online(struct chp_id chpid)
570 {
571 char dbf_txt[15];
572 struct chp_link link;
573
574 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
575 CIO_TRACE_EVENT(2, dbf_txt);
576
577 if (chp_get_status(chpid) != 0) {
578 memset(&link, 0, sizeof(struct chp_link));
579 link.chpid = chpid;
580 /* Wait until previous actions have settled. */
581 css_wait_for_slow_path();
582 for_each_subchannel_staged(__s390_process_res_acc, NULL,
583 &link);
584 }
585 }
586
587 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
588 struct chp_id chpid, int on)
589 {
590 unsigned long flags;
591 struct chp_link link;
592
593 memset(&link, 0, sizeof(struct chp_link));
594 link.chpid = chpid;
595 spin_lock_irqsave(sch->lock, flags);
596 if (sch->driver && sch->driver->chp_event)
597 sch->driver->chp_event(sch, &link,
598 on ? CHP_VARY_ON : CHP_VARY_OFF);
599 spin_unlock_irqrestore(sch->lock, flags);
600 }
601
602 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
603 {
604 struct chp_id *chpid = data;
605
606 __s390_subchannel_vary_chpid(sch, *chpid, 0);
607 return 0;
608 }
609
610 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
611 {
612 struct chp_id *chpid = data;
613
614 __s390_subchannel_vary_chpid(sch, *chpid, 1);
615 return 0;
616 }
617
618 static int
619 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
620 {
621 struct schib schib;
622
623 if (stsch_err(schid, &schib))
624 /* We're through */
625 return -ENXIO;
626 /* Put it on the slow path. */
627 css_schedule_eval(schid);
628 return 0;
629 }
630
631 /**
632 * chsc_chp_vary - propagate channel-path vary operation to subchannels
633 * @chpid: channl-path ID
634 * @on: non-zero for vary online, zero for vary offline
635 */
636 int chsc_chp_vary(struct chp_id chpid, int on)
637 {
638 struct channel_path *chp = chpid_to_chp(chpid);
639
640 /* Wait until previous actions have settled. */
641 css_wait_for_slow_path();
642 /*
643 * Redo PathVerification on the devices the chpid connects to
644 */
645 if (on) {
646 /* Try to update the channel path description. */
647 chp_update_desc(chp);
648 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
649 __s390_vary_chpid_on, &chpid);
650 } else
651 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
652 NULL, &chpid);
653
654 return 0;
655 }
656
657 static void
658 chsc_remove_cmg_attr(struct channel_subsystem *css)
659 {
660 int i;
661
662 for (i = 0; i <= __MAX_CHPID; i++) {
663 if (!css->chps[i])
664 continue;
665 chp_remove_cmg_attr(css->chps[i]);
666 }
667 }
668
669 static int
670 chsc_add_cmg_attr(struct channel_subsystem *css)
671 {
672 int i, ret;
673
674 ret = 0;
675 for (i = 0; i <= __MAX_CHPID; i++) {
676 if (!css->chps[i])
677 continue;
678 ret = chp_add_cmg_attr(css->chps[i]);
679 if (ret)
680 goto cleanup;
681 }
682 return ret;
683 cleanup:
684 for (--i; i >= 0; i--) {
685 if (!css->chps[i])
686 continue;
687 chp_remove_cmg_attr(css->chps[i]);
688 }
689 return ret;
690 }
691
692 int __chsc_do_secm(struct channel_subsystem *css, int enable)
693 {
694 struct {
695 struct chsc_header request;
696 u32 operation_code : 2;
697 u32 : 30;
698 u32 key : 4;
699 u32 : 28;
700 u32 zeroes1;
701 u32 cub_addr1;
702 u32 zeroes2;
703 u32 cub_addr2;
704 u32 reserved[13];
705 struct chsc_header response;
706 u32 status : 8;
707 u32 : 4;
708 u32 fmt : 4;
709 u32 : 16;
710 } __attribute__ ((packed)) *secm_area;
711 int ret, ccode;
712
713 spin_lock_irq(&chsc_page_lock);
714 memset(chsc_page, 0, PAGE_SIZE);
715 secm_area = chsc_page;
716 secm_area->request.length = 0x0050;
717 secm_area->request.code = 0x0016;
718
719 secm_area->key = PAGE_DEFAULT_KEY >> 4;
720 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
721 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
722
723 secm_area->operation_code = enable ? 0 : 1;
724
725 ccode = chsc(secm_area);
726 if (ccode > 0) {
727 ret = (ccode == 3) ? -ENODEV : -EBUSY;
728 goto out;
729 }
730
731 switch (secm_area->response.code) {
732 case 0x0102:
733 case 0x0103:
734 ret = -EINVAL;
735 break;
736 default:
737 ret = chsc_error_from_response(secm_area->response.code);
738 }
739 if (ret != 0)
740 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
741 secm_area->response.code);
742 out:
743 spin_unlock_irq(&chsc_page_lock);
744 return ret;
745 }
746
747 int
748 chsc_secm(struct channel_subsystem *css, int enable)
749 {
750 int ret;
751
752 if (enable && !css->cm_enabled) {
753 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
754 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
755 if (!css->cub_addr1 || !css->cub_addr2) {
756 free_page((unsigned long)css->cub_addr1);
757 free_page((unsigned long)css->cub_addr2);
758 return -ENOMEM;
759 }
760 }
761 ret = __chsc_do_secm(css, enable);
762 if (!ret) {
763 css->cm_enabled = enable;
764 if (css->cm_enabled) {
765 ret = chsc_add_cmg_attr(css);
766 if (ret) {
767 __chsc_do_secm(css, 0);
768 css->cm_enabled = 0;
769 }
770 } else
771 chsc_remove_cmg_attr(css);
772 }
773 if (!css->cm_enabled) {
774 free_page((unsigned long)css->cub_addr1);
775 free_page((unsigned long)css->cub_addr2);
776 }
777 return ret;
778 }
779
780 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
781 int c, int m, void *page)
782 {
783 struct chsc_scpd *scpd_area;
784 int ccode, ret;
785
786 if ((rfmt == 1) && !css_general_characteristics.fcs)
787 return -EINVAL;
788 if ((rfmt == 2) && !css_general_characteristics.cib)
789 return -EINVAL;
790
791 memset(page, 0, PAGE_SIZE);
792 scpd_area = page;
793 scpd_area->request.length = 0x0010;
794 scpd_area->request.code = 0x0002;
795 scpd_area->cssid = chpid.cssid;
796 scpd_area->first_chpid = chpid.id;
797 scpd_area->last_chpid = chpid.id;
798 scpd_area->m = m;
799 scpd_area->c = c;
800 scpd_area->fmt = fmt;
801 scpd_area->rfmt = rfmt;
802
803 ccode = chsc(scpd_area);
804 if (ccode > 0)
805 return (ccode == 3) ? -ENODEV : -EBUSY;
806
807 ret = chsc_error_from_response(scpd_area->response.code);
808 if (ret)
809 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
810 scpd_area->response.code);
811 return ret;
812 }
813 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
814
815 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
816 struct channel_path_desc *desc)
817 {
818 struct chsc_response_struct *chsc_resp;
819 struct chsc_scpd *scpd_area;
820 unsigned long flags;
821 int ret;
822
823 spin_lock_irqsave(&chsc_page_lock, flags);
824 scpd_area = chsc_page;
825 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
826 if (ret)
827 goto out;
828 chsc_resp = (void *)&scpd_area->response;
829 memcpy(desc, &chsc_resp->data, sizeof(*desc));
830 out:
831 spin_unlock_irqrestore(&chsc_page_lock, flags);
832 return ret;
833 }
834
835 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
836 struct channel_path_desc_fmt1 *desc)
837 {
838 struct chsc_response_struct *chsc_resp;
839 struct chsc_scpd *scpd_area;
840 unsigned long flags;
841 int ret;
842
843 spin_lock_irqsave(&chsc_page_lock, flags);
844 scpd_area = chsc_page;
845 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
846 if (ret)
847 goto out;
848 chsc_resp = (void *)&scpd_area->response;
849 memcpy(desc, &chsc_resp->data, sizeof(*desc));
850 out:
851 spin_unlock_irqrestore(&chsc_page_lock, flags);
852 return ret;
853 }
854
855 static void
856 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
857 struct cmg_chars *chars)
858 {
859 struct cmg_chars *cmg_chars;
860 int i, mask;
861
862 cmg_chars = chp->cmg_chars;
863 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
864 mask = 0x80 >> (i + 3);
865 if (cmcv & mask)
866 cmg_chars->values[i] = chars->values[i];
867 else
868 cmg_chars->values[i] = 0;
869 }
870 }
871
872 int chsc_get_channel_measurement_chars(struct channel_path *chp)
873 {
874 struct cmg_chars *cmg_chars;
875 int ccode, ret;
876
877 struct {
878 struct chsc_header request;
879 u32 : 24;
880 u32 first_chpid : 8;
881 u32 : 24;
882 u32 last_chpid : 8;
883 u32 zeroes1;
884 struct chsc_header response;
885 u32 zeroes2;
886 u32 not_valid : 1;
887 u32 shared : 1;
888 u32 : 22;
889 u32 chpid : 8;
890 u32 cmcv : 5;
891 u32 : 11;
892 u32 cmgq : 8;
893 u32 cmg : 8;
894 u32 zeroes3;
895 u32 data[NR_MEASUREMENT_CHARS];
896 } __attribute__ ((packed)) *scmc_area;
897
898 chp->cmg_chars = NULL;
899 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
900 if (!cmg_chars)
901 return -ENOMEM;
902
903 spin_lock_irq(&chsc_page_lock);
904 memset(chsc_page, 0, PAGE_SIZE);
905 scmc_area = chsc_page;
906 scmc_area->request.length = 0x0010;
907 scmc_area->request.code = 0x0022;
908 scmc_area->first_chpid = chp->chpid.id;
909 scmc_area->last_chpid = chp->chpid.id;
910
911 ccode = chsc(scmc_area);
912 if (ccode > 0) {
913 ret = (ccode == 3) ? -ENODEV : -EBUSY;
914 goto out;
915 }
916
917 ret = chsc_error_from_response(scmc_area->response.code);
918 if (ret) {
919 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
920 scmc_area->response.code);
921 goto out;
922 }
923 if (scmc_area->not_valid) {
924 chp->cmg = -1;
925 chp->shared = -1;
926 goto out;
927 }
928 chp->cmg = scmc_area->cmg;
929 chp->shared = scmc_area->shared;
930 if (chp->cmg != 2 && chp->cmg != 3) {
931 /* No cmg-dependent data. */
932 goto out;
933 }
934 chp->cmg_chars = cmg_chars;
935 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
936 (struct cmg_chars *) &scmc_area->data);
937 out:
938 spin_unlock_irq(&chsc_page_lock);
939 if (!chp->cmg_chars)
940 kfree(cmg_chars);
941
942 return ret;
943 }
944
945 int __init chsc_init(void)
946 {
947 int ret;
948
949 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
950 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
951 if (!sei_page || !chsc_page) {
952 ret = -ENOMEM;
953 goto out_err;
954 }
955 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
956 if (ret)
957 goto out_err;
958 return ret;
959 out_err:
960 free_page((unsigned long)chsc_page);
961 free_page((unsigned long)sei_page);
962 return ret;
963 }
964
965 void __init chsc_init_cleanup(void)
966 {
967 crw_unregister_handler(CRW_RSC_CSS);
968 free_page((unsigned long)chsc_page);
969 free_page((unsigned long)sei_page);
970 }
971
972 int chsc_enable_facility(int operation_code)
973 {
974 unsigned long flags;
975 int ret;
976 struct {
977 struct chsc_header request;
978 u8 reserved1:4;
979 u8 format:4;
980 u8 reserved2;
981 u16 operation_code;
982 u32 reserved3;
983 u32 reserved4;
984 u32 operation_data_area[252];
985 struct chsc_header response;
986 u32 reserved5:4;
987 u32 format2:4;
988 u32 reserved6:24;
989 } __attribute__ ((packed)) *sda_area;
990
991 spin_lock_irqsave(&chsc_page_lock, flags);
992 memset(chsc_page, 0, PAGE_SIZE);
993 sda_area = chsc_page;
994 sda_area->request.length = 0x0400;
995 sda_area->request.code = 0x0031;
996 sda_area->operation_code = operation_code;
997
998 ret = chsc(sda_area);
999 if (ret > 0) {
1000 ret = (ret == 3) ? -ENODEV : -EBUSY;
1001 goto out;
1002 }
1003
1004 switch (sda_area->response.code) {
1005 case 0x0101:
1006 ret = -EOPNOTSUPP;
1007 break;
1008 default:
1009 ret = chsc_error_from_response(sda_area->response.code);
1010 }
1011 if (ret != 0)
1012 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1013 operation_code, sda_area->response.code);
1014 out:
1015 spin_unlock_irqrestore(&chsc_page_lock, flags);
1016 return ret;
1017 }
1018
1019 struct css_general_char css_general_characteristics;
1020 struct css_chsc_char css_chsc_characteristics;
1021
1022 int __init
1023 chsc_determine_css_characteristics(void)
1024 {
1025 int result;
1026 struct {
1027 struct chsc_header request;
1028 u32 reserved1;
1029 u32 reserved2;
1030 u32 reserved3;
1031 struct chsc_header response;
1032 u32 reserved4;
1033 u32 general_char[510];
1034 u32 chsc_char[508];
1035 } __attribute__ ((packed)) *scsc_area;
1036
1037 spin_lock_irq(&chsc_page_lock);
1038 memset(chsc_page, 0, PAGE_SIZE);
1039 scsc_area = chsc_page;
1040 scsc_area->request.length = 0x0010;
1041 scsc_area->request.code = 0x0010;
1042
1043 result = chsc(scsc_area);
1044 if (result) {
1045 result = (result == 3) ? -ENODEV : -EBUSY;
1046 goto exit;
1047 }
1048
1049 result = chsc_error_from_response(scsc_area->response.code);
1050 if (result == 0) {
1051 memcpy(&css_general_characteristics, scsc_area->general_char,
1052 sizeof(css_general_characteristics));
1053 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1054 sizeof(css_chsc_characteristics));
1055 } else
1056 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1057 scsc_area->response.code);
1058 exit:
1059 spin_unlock_irq(&chsc_page_lock);
1060 return result;
1061 }
1062
1063 EXPORT_SYMBOL_GPL(css_general_characteristics);
1064 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1065
1066 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1067 {
1068 struct {
1069 struct chsc_header request;
1070 unsigned int rsvd0;
1071 unsigned int op : 8;
1072 unsigned int rsvd1 : 8;
1073 unsigned int ctrl : 16;
1074 unsigned int rsvd2[5];
1075 struct chsc_header response;
1076 unsigned int rsvd3[7];
1077 } __attribute__ ((packed)) *rr;
1078 int rc;
1079
1080 memset(page, 0, PAGE_SIZE);
1081 rr = page;
1082 rr->request.length = 0x0020;
1083 rr->request.code = 0x0033;
1084 rr->op = op;
1085 rr->ctrl = ctrl;
1086 rc = chsc(rr);
1087 if (rc)
1088 return -EIO;
1089 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1090 return rc;
1091 }
1092
1093 int chsc_sstpi(void *page, void *result, size_t size)
1094 {
1095 struct {
1096 struct chsc_header request;
1097 unsigned int rsvd0[3];
1098 struct chsc_header response;
1099 char data[size];
1100 } __attribute__ ((packed)) *rr;
1101 int rc;
1102
1103 memset(page, 0, PAGE_SIZE);
1104 rr = page;
1105 rr->request.length = 0x0010;
1106 rr->request.code = 0x0038;
1107 rc = chsc(rr);
1108 if (rc)
1109 return -EIO;
1110 memcpy(result, &rr->data, size);
1111 return (rr->response.code == 0x0001) ? 0 : -EIO;
1112 }
1113
1114 int chsc_siosl(struct subchannel_id schid)
1115 {
1116 struct {
1117 struct chsc_header request;
1118 u32 word1;
1119 struct subchannel_id sid;
1120 u32 word3;
1121 struct chsc_header response;
1122 u32 word[11];
1123 } __attribute__ ((packed)) *siosl_area;
1124 unsigned long flags;
1125 int ccode;
1126 int rc;
1127
1128 spin_lock_irqsave(&chsc_page_lock, flags);
1129 memset(chsc_page, 0, PAGE_SIZE);
1130 siosl_area = chsc_page;
1131 siosl_area->request.length = 0x0010;
1132 siosl_area->request.code = 0x0046;
1133 siosl_area->word1 = 0x80000000;
1134 siosl_area->sid = schid;
1135
1136 ccode = chsc(siosl_area);
1137 if (ccode > 0) {
1138 if (ccode == 3)
1139 rc = -ENODEV;
1140 else
1141 rc = -EBUSY;
1142 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1143 schid.ssid, schid.sch_no, ccode);
1144 goto out;
1145 }
1146 rc = chsc_error_from_response(siosl_area->response.code);
1147 if (rc)
1148 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1149 schid.ssid, schid.sch_no,
1150 siosl_area->response.code);
1151 else
1152 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1153 schid.ssid, schid.sch_no);
1154 out:
1155 spin_unlock_irqrestore(&chsc_page_lock, flags);
1156 return rc;
1157 }
1158 EXPORT_SYMBOL_GPL(chsc_siosl);
1159
1160 /**
1161 * chsc_scm_info() - store SCM information (SSI)
1162 * @scm_area: request and response block for SSI
1163 * @token: continuation token
1164 *
1165 * Returns 0 on success.
1166 */
1167 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1168 {
1169 int ccode, ret;
1170
1171 memset(scm_area, 0, sizeof(*scm_area));
1172 scm_area->request.length = 0x0020;
1173 scm_area->request.code = 0x004C;
1174 scm_area->reqtok = token;
1175
1176 ccode = chsc(scm_area);
1177 if (ccode > 0) {
1178 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1179 goto out;
1180 }
1181 ret = chsc_error_from_response(scm_area->response.code);
1182 if (ret != 0)
1183 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1184 scm_area->response.code);
1185 out:
1186 return ret;
1187 }
1188 EXPORT_SYMBOL_GPL(chsc_scm_info);
kernel source for telekom puls (alcatel/mediatek)