Merge tag 'for-linus-20121219' of git://git.infradead.org/linux-mtd
[deliverable/linux.git] / drivers / s390 / char / sclp_cmd.c
1 /*
2 * Copyright IBM Corp. 2007,2012
3 *
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
5 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
6 */
7
8 #define KMSG_COMPONENT "sclp_cmd"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11 #include <linux/completion.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/export.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
18 #include <linux/mm.h>
19 #include <linux/mmzone.h>
20 #include <linux/memory.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <asm/ctl_reg.h>
24 #include <asm/chpid.h>
25 #include <asm/setup.h>
26 #include <asm/page.h>
27 #include <asm/sclp.h>
28
29 #include "sclp.h"
30
31 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
32 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
33
34 struct read_info_sccb {
35 struct sccb_header header; /* 0-7 */
36 u16 rnmax; /* 8-9 */
37 u8 rnsize; /* 10 */
38 u8 _reserved0[24 - 11]; /* 11-15 */
39 u8 loadparm[8]; /* 24-31 */
40 u8 _reserved1[48 - 32]; /* 32-47 */
41 u64 facilities; /* 48-55 */
42 u8 _reserved2[84 - 56]; /* 56-83 */
43 u8 fac84; /* 84 */
44 u8 fac85; /* 85 */
45 u8 _reserved3[91 - 86]; /* 86-90 */
46 u8 flags; /* 91 */
47 u8 _reserved4[100 - 92]; /* 92-99 */
48 u32 rnsize2; /* 100-103 */
49 u64 rnmax2; /* 104-111 */
50 u8 _reserved5[4096 - 112]; /* 112-4095 */
51 } __attribute__((packed, aligned(PAGE_SIZE)));
52
53 static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE);
54 static struct read_info_sccb __initdata early_read_info_sccb;
55 static int __initdata early_read_info_sccb_valid;
56
57 u64 sclp_facilities;
58 static u8 sclp_fac84;
59 static u8 sclp_fac85;
60 static unsigned long long rzm;
61 static unsigned long long rnmax;
62
63 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
64 {
65 int rc;
66
67 __ctl_set_bit(0, 9);
68 rc = sclp_service_call(cmd, sccb);
69 if (rc)
70 goto out;
71 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
72 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
73 local_irq_disable();
74 out:
75 /* Contents of the sccb might have changed. */
76 barrier();
77 __ctl_clear_bit(0, 9);
78 return rc;
79 }
80
81 static void __init sclp_read_info_early(void)
82 {
83 int rc;
84 int i;
85 struct read_info_sccb *sccb;
86 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
87 SCLP_CMDW_READ_SCP_INFO};
88
89 sccb = &early_read_info_sccb;
90 for (i = 0; i < ARRAY_SIZE(commands); i++) {
91 do {
92 memset(sccb, 0, sizeof(*sccb));
93 sccb->header.length = sizeof(*sccb);
94 sccb->header.function_code = 0x80;
95 sccb->header.control_mask[2] = 0x80;
96 rc = sclp_cmd_sync_early(commands[i], sccb);
97 } while (rc == -EBUSY);
98
99 if (rc)
100 break;
101 if (sccb->header.response_code == 0x10) {
102 early_read_info_sccb_valid = 1;
103 break;
104 }
105 if (sccb->header.response_code != 0x1f0)
106 break;
107 }
108 }
109
110 static void __init sclp_event_mask_early(void)
111 {
112 struct init_sccb *sccb = &early_event_mask_sccb;
113 int rc;
114
115 do {
116 memset(sccb, 0, sizeof(*sccb));
117 sccb->header.length = sizeof(*sccb);
118 sccb->mask_length = sizeof(sccb_mask_t);
119 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
120 } while (rc == -EBUSY);
121 }
122
123 void __init sclp_facilities_detect(void)
124 {
125 struct read_info_sccb *sccb;
126
127 sclp_read_info_early();
128 if (!early_read_info_sccb_valid)
129 return;
130
131 sccb = &early_read_info_sccb;
132 sclp_facilities = sccb->facilities;
133 sclp_fac84 = sccb->fac84;
134 sclp_fac85 = sccb->fac85;
135 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
136 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
137 rzm <<= 20;
138
139 sclp_event_mask_early();
140 }
141
142 bool __init sclp_has_linemode(void)
143 {
144 struct init_sccb *sccb = &early_event_mask_sccb;
145
146 if (sccb->header.response_code != 0x20)
147 return 0;
148 if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))
149 return 1;
150 return 0;
151 }
152
153 bool __init sclp_has_vt220(void)
154 {
155 struct init_sccb *sccb = &early_event_mask_sccb;
156
157 if (sccb->header.response_code != 0x20)
158 return 0;
159 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
160 return 1;
161 return 0;
162 }
163
164 unsigned long long sclp_get_rnmax(void)
165 {
166 return rnmax;
167 }
168
169 unsigned long long sclp_get_rzm(void)
170 {
171 return rzm;
172 }
173
174 u8 sclp_get_fac85(void)
175 {
176 return sclp_fac85;
177 }
178 EXPORT_SYMBOL_GPL(sclp_get_fac85);
179
180 /*
181 * This function will be called after sclp_facilities_detect(), which gets
182 * called from early.c code. Therefore the sccb should have valid contents.
183 */
184 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
185 {
186 struct read_info_sccb *sccb;
187
188 if (!early_read_info_sccb_valid)
189 return;
190 sccb = &early_read_info_sccb;
191 info->is_valid = 1;
192 if (sccb->flags & 0x2)
193 info->has_dump = 1;
194 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
195 }
196
197 static void sclp_sync_callback(struct sclp_req *req, void *data)
198 {
199 struct completion *completion = data;
200
201 complete(completion);
202 }
203
204 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
205 {
206 struct completion completion;
207 struct sclp_req *request;
208 int rc;
209
210 request = kzalloc(sizeof(*request), GFP_KERNEL);
211 if (!request)
212 return -ENOMEM;
213 request->command = cmd;
214 request->sccb = sccb;
215 request->status = SCLP_REQ_FILLED;
216 request->callback = sclp_sync_callback;
217 request->callback_data = &completion;
218 init_completion(&completion);
219
220 /* Perform sclp request. */
221 rc = sclp_add_request(request);
222 if (rc)
223 goto out;
224 wait_for_completion(&completion);
225
226 /* Check response. */
227 if (request->status != SCLP_REQ_DONE) {
228 pr_warning("sync request failed (cmd=0x%08x, "
229 "status=0x%02x)\n", cmd, request->status);
230 rc = -EIO;
231 }
232 out:
233 kfree(request);
234 return rc;
235 }
236
237 /*
238 * CPU configuration related functions.
239 */
240
241 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
242 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
243 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
244
245 struct read_cpu_info_sccb {
246 struct sccb_header header;
247 u16 nr_configured;
248 u16 offset_configured;
249 u16 nr_standby;
250 u16 offset_standby;
251 u8 reserved[4096 - 16];
252 } __attribute__((packed, aligned(PAGE_SIZE)));
253
254 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
255 struct read_cpu_info_sccb *sccb)
256 {
257 char *page = (char *) sccb;
258
259 memset(info, 0, sizeof(*info));
260 info->configured = sccb->nr_configured;
261 info->standby = sccb->nr_standby;
262 info->combined = sccb->nr_configured + sccb->nr_standby;
263 info->has_cpu_type = sclp_fac84 & 0x1;
264 memcpy(&info->cpu, page + sccb->offset_configured,
265 info->combined * sizeof(struct sclp_cpu_entry));
266 }
267
268 int sclp_get_cpu_info(struct sclp_cpu_info *info)
269 {
270 int rc;
271 struct read_cpu_info_sccb *sccb;
272
273 if (!SCLP_HAS_CPU_INFO)
274 return -EOPNOTSUPP;
275 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
276 if (!sccb)
277 return -ENOMEM;
278 sccb->header.length = sizeof(*sccb);
279 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
280 if (rc)
281 goto out;
282 if (sccb->header.response_code != 0x0010) {
283 pr_warning("readcpuinfo failed (response=0x%04x)\n",
284 sccb->header.response_code);
285 rc = -EIO;
286 goto out;
287 }
288 sclp_fill_cpu_info(info, sccb);
289 out:
290 free_page((unsigned long) sccb);
291 return rc;
292 }
293
294 struct cpu_configure_sccb {
295 struct sccb_header header;
296 } __attribute__((packed, aligned(8)));
297
298 static int do_cpu_configure(sclp_cmdw_t cmd)
299 {
300 struct cpu_configure_sccb *sccb;
301 int rc;
302
303 if (!SCLP_HAS_CPU_RECONFIG)
304 return -EOPNOTSUPP;
305 /*
306 * This is not going to cross a page boundary since we force
307 * kmalloc to have a minimum alignment of 8 bytes on s390.
308 */
309 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
310 if (!sccb)
311 return -ENOMEM;
312 sccb->header.length = sizeof(*sccb);
313 rc = do_sync_request(cmd, sccb);
314 if (rc)
315 goto out;
316 switch (sccb->header.response_code) {
317 case 0x0020:
318 case 0x0120:
319 break;
320 default:
321 pr_warning("configure cpu failed (cmd=0x%08x, "
322 "response=0x%04x)\n", cmd,
323 sccb->header.response_code);
324 rc = -EIO;
325 break;
326 }
327 out:
328 kfree(sccb);
329 return rc;
330 }
331
332 int sclp_cpu_configure(u8 cpu)
333 {
334 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
335 }
336
337 int sclp_cpu_deconfigure(u8 cpu)
338 {
339 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
340 }
341
342 #ifdef CONFIG_MEMORY_HOTPLUG
343
344 static DEFINE_MUTEX(sclp_mem_mutex);
345 static LIST_HEAD(sclp_mem_list);
346 static u8 sclp_max_storage_id;
347 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
348 static int sclp_mem_state_changed;
349
350 struct memory_increment {
351 struct list_head list;
352 u16 rn;
353 int standby;
354 int usecount;
355 };
356
357 struct assign_storage_sccb {
358 struct sccb_header header;
359 u16 rn;
360 } __packed;
361
362 int arch_get_memory_phys_device(unsigned long start_pfn)
363 {
364 if (!rzm)
365 return 0;
366 return PFN_PHYS(start_pfn) >> ilog2(rzm);
367 }
368
369 static unsigned long long rn2addr(u16 rn)
370 {
371 return (unsigned long long) (rn - 1) * rzm;
372 }
373
374 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
375 {
376 struct assign_storage_sccb *sccb;
377 int rc;
378
379 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
380 if (!sccb)
381 return -ENOMEM;
382 sccb->header.length = PAGE_SIZE;
383 sccb->rn = rn;
384 rc = do_sync_request(cmd, sccb);
385 if (rc)
386 goto out;
387 switch (sccb->header.response_code) {
388 case 0x0020:
389 case 0x0120:
390 break;
391 default:
392 pr_warning("assign storage failed (cmd=0x%08x, "
393 "response=0x%04x, rn=0x%04x)\n", cmd,
394 sccb->header.response_code, rn);
395 rc = -EIO;
396 break;
397 }
398 out:
399 free_page((unsigned long) sccb);
400 return rc;
401 }
402
403 static int sclp_assign_storage(u16 rn)
404 {
405 unsigned long long start;
406 int rc;
407
408 rc = do_assign_storage(0x000d0001, rn);
409 if (rc)
410 return rc;
411 start = rn2addr(rn);
412 storage_key_init_range(start, start + rzm);
413 return 0;
414 }
415
416 static int sclp_unassign_storage(u16 rn)
417 {
418 return do_assign_storage(0x000c0001, rn);
419 }
420
421 struct attach_storage_sccb {
422 struct sccb_header header;
423 u16 :16;
424 u16 assigned;
425 u32 :32;
426 u32 entries[0];
427 } __packed;
428
429 static int sclp_attach_storage(u8 id)
430 {
431 struct attach_storage_sccb *sccb;
432 int rc;
433 int i;
434
435 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
436 if (!sccb)
437 return -ENOMEM;
438 sccb->header.length = PAGE_SIZE;
439 rc = do_sync_request(0x00080001 | id << 8, sccb);
440 if (rc)
441 goto out;
442 switch (sccb->header.response_code) {
443 case 0x0020:
444 set_bit(id, sclp_storage_ids);
445 for (i = 0; i < sccb->assigned; i++) {
446 if (sccb->entries[i])
447 sclp_unassign_storage(sccb->entries[i] >> 16);
448 }
449 break;
450 default:
451 rc = -EIO;
452 break;
453 }
454 out:
455 free_page((unsigned long) sccb);
456 return rc;
457 }
458
459 static int sclp_mem_change_state(unsigned long start, unsigned long size,
460 int online)
461 {
462 struct memory_increment *incr;
463 unsigned long long istart;
464 int rc = 0;
465
466 list_for_each_entry(incr, &sclp_mem_list, list) {
467 istart = rn2addr(incr->rn);
468 if (start + size - 1 < istart)
469 break;
470 if (start > istart + rzm - 1)
471 continue;
472 if (online) {
473 if (incr->usecount++)
474 continue;
475 /*
476 * Don't break the loop if one assign fails. Loop may
477 * be walked again on CANCEL and we can't save
478 * information if state changed before or not.
479 * So continue and increase usecount for all increments.
480 */
481 rc |= sclp_assign_storage(incr->rn);
482 } else {
483 if (--incr->usecount)
484 continue;
485 sclp_unassign_storage(incr->rn);
486 }
487 }
488 return rc ? -EIO : 0;
489 }
490
491 static int sclp_mem_notifier(struct notifier_block *nb,
492 unsigned long action, void *data)
493 {
494 unsigned long start, size;
495 struct memory_notify *arg;
496 unsigned char id;
497 int rc = 0;
498
499 arg = data;
500 start = arg->start_pfn << PAGE_SHIFT;
501 size = arg->nr_pages << PAGE_SHIFT;
502 mutex_lock(&sclp_mem_mutex);
503 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
504 sclp_attach_storage(id);
505 switch (action) {
506 case MEM_ONLINE:
507 case MEM_GOING_OFFLINE:
508 case MEM_CANCEL_OFFLINE:
509 break;
510 case MEM_GOING_ONLINE:
511 rc = sclp_mem_change_state(start, size, 1);
512 break;
513 case MEM_CANCEL_ONLINE:
514 sclp_mem_change_state(start, size, 0);
515 break;
516 case MEM_OFFLINE:
517 sclp_mem_change_state(start, size, 0);
518 break;
519 default:
520 rc = -EINVAL;
521 break;
522 }
523 if (!rc)
524 sclp_mem_state_changed = 1;
525 mutex_unlock(&sclp_mem_mutex);
526 return rc ? NOTIFY_BAD : NOTIFY_OK;
527 }
528
529 static struct notifier_block sclp_mem_nb = {
530 .notifier_call = sclp_mem_notifier,
531 };
532
533 static void __init add_memory_merged(u16 rn)
534 {
535 static u16 first_rn, num;
536 unsigned long long start, size;
537
538 if (rn && first_rn && (first_rn + num == rn)) {
539 num++;
540 return;
541 }
542 if (!first_rn)
543 goto skip_add;
544 start = rn2addr(first_rn);
545 size = (unsigned long long ) num * rzm;
546 if (start >= VMEM_MAX_PHYS)
547 goto skip_add;
548 if (start + size > VMEM_MAX_PHYS)
549 size = VMEM_MAX_PHYS - start;
550 if (memory_end_set && (start >= memory_end))
551 goto skip_add;
552 if (memory_end_set && (start + size > memory_end))
553 size = memory_end - start;
554 add_memory(0, start, size);
555 skip_add:
556 first_rn = rn;
557 num = 1;
558 }
559
560 static void __init sclp_add_standby_memory(void)
561 {
562 struct memory_increment *incr;
563
564 list_for_each_entry(incr, &sclp_mem_list, list)
565 if (incr->standby)
566 add_memory_merged(incr->rn);
567 add_memory_merged(0);
568 }
569
570 static void __init insert_increment(u16 rn, int standby, int assigned)
571 {
572 struct memory_increment *incr, *new_incr;
573 struct list_head *prev;
574 u16 last_rn;
575
576 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
577 if (!new_incr)
578 return;
579 new_incr->rn = rn;
580 new_incr->standby = standby;
581 if (!standby)
582 new_incr->usecount = 1;
583 last_rn = 0;
584 prev = &sclp_mem_list;
585 list_for_each_entry(incr, &sclp_mem_list, list) {
586 if (assigned && incr->rn > rn)
587 break;
588 if (!assigned && incr->rn - last_rn > 1)
589 break;
590 last_rn = incr->rn;
591 prev = &incr->list;
592 }
593 if (!assigned)
594 new_incr->rn = last_rn + 1;
595 if (new_incr->rn > rnmax) {
596 kfree(new_incr);
597 return;
598 }
599 list_add(&new_incr->list, prev);
600 }
601
602 static int sclp_mem_freeze(struct device *dev)
603 {
604 if (!sclp_mem_state_changed)
605 return 0;
606 pr_err("Memory hotplug state changed, suspend refused.\n");
607 return -EPERM;
608 }
609
610 struct read_storage_sccb {
611 struct sccb_header header;
612 u16 max_id;
613 u16 assigned;
614 u16 standby;
615 u16 :16;
616 u32 entries[0];
617 } __packed;
618
619 static const struct dev_pm_ops sclp_mem_pm_ops = {
620 .freeze = sclp_mem_freeze,
621 };
622
623 static struct platform_driver sclp_mem_pdrv = {
624 .driver = {
625 .name = "sclp_mem",
626 .pm = &sclp_mem_pm_ops,
627 },
628 };
629
630 static int __init sclp_detect_standby_memory(void)
631 {
632 struct platform_device *sclp_pdev;
633 struct read_storage_sccb *sccb;
634 int i, id, assigned, rc;
635
636 if (!early_read_info_sccb_valid)
637 return 0;
638 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
639 return 0;
640 rc = -ENOMEM;
641 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
642 if (!sccb)
643 goto out;
644 assigned = 0;
645 for (id = 0; id <= sclp_max_storage_id; id++) {
646 memset(sccb, 0, PAGE_SIZE);
647 sccb->header.length = PAGE_SIZE;
648 rc = do_sync_request(0x00040001 | id << 8, sccb);
649 if (rc)
650 goto out;
651 switch (sccb->header.response_code) {
652 case 0x0010:
653 set_bit(id, sclp_storage_ids);
654 for (i = 0; i < sccb->assigned; i++) {
655 if (!sccb->entries[i])
656 continue;
657 assigned++;
658 insert_increment(sccb->entries[i] >> 16, 0, 1);
659 }
660 break;
661 case 0x0310:
662 break;
663 case 0x0410:
664 for (i = 0; i < sccb->assigned; i++) {
665 if (!sccb->entries[i])
666 continue;
667 assigned++;
668 insert_increment(sccb->entries[i] >> 16, 1, 1);
669 }
670 break;
671 default:
672 rc = -EIO;
673 break;
674 }
675 if (!rc)
676 sclp_max_storage_id = sccb->max_id;
677 }
678 if (rc || list_empty(&sclp_mem_list))
679 goto out;
680 for (i = 1; i <= rnmax - assigned; i++)
681 insert_increment(0, 1, 0);
682 rc = register_memory_notifier(&sclp_mem_nb);
683 if (rc)
684 goto out;
685 rc = platform_driver_register(&sclp_mem_pdrv);
686 if (rc)
687 goto out;
688 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
689 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
690 if (rc)
691 goto out_driver;
692 sclp_add_standby_memory();
693 goto out;
694 out_driver:
695 platform_driver_unregister(&sclp_mem_pdrv);
696 out:
697 free_page((unsigned long) sccb);
698 return rc;
699 }
700 __initcall(sclp_detect_standby_memory);
701
702 #endif /* CONFIG_MEMORY_HOTPLUG */
703
704 /*
705 * PCI I/O adapter configuration related functions.
706 */
707 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
708 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
709
710 #define SCLP_RECONFIG_PCI_ATPYE 2
711
712 struct pci_cfg_sccb {
713 struct sccb_header header;
714 u8 atype; /* adapter type */
715 u8 reserved1;
716 u16 reserved2;
717 u32 aid; /* adapter identifier */
718 } __packed;
719
720 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
721 {
722 struct pci_cfg_sccb *sccb;
723 int rc;
724
725 if (!SCLP_HAS_PCI_RECONFIG)
726 return -EOPNOTSUPP;
727
728 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
729 if (!sccb)
730 return -ENOMEM;
731
732 sccb->header.length = PAGE_SIZE;
733 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
734 sccb->aid = fid;
735 rc = do_sync_request(cmd, sccb);
736 if (rc)
737 goto out;
738 switch (sccb->header.response_code) {
739 case 0x0020:
740 case 0x0120:
741 break;
742 default:
743 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
744 cmd, sccb->header.response_code);
745 rc = -EIO;
746 break;
747 }
748 out:
749 free_page((unsigned long) sccb);
750 return rc;
751 }
752
753 int sclp_pci_configure(u32 fid)
754 {
755 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
756 }
757 EXPORT_SYMBOL(sclp_pci_configure);
758
759 int sclp_pci_deconfigure(u32 fid)
760 {
761 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
762 }
763 EXPORT_SYMBOL(sclp_pci_deconfigure);
764
765 /*
766 * Channel path configuration related functions.
767 */
768
769 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
770 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
771 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
772
773 struct chp_cfg_sccb {
774 struct sccb_header header;
775 u8 ccm;
776 u8 reserved[6];
777 u8 cssid;
778 } __attribute__((packed));
779
780 static int do_chp_configure(sclp_cmdw_t cmd)
781 {
782 struct chp_cfg_sccb *sccb;
783 int rc;
784
785 if (!SCLP_HAS_CHP_RECONFIG)
786 return -EOPNOTSUPP;
787 /* Prepare sccb. */
788 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
789 if (!sccb)
790 return -ENOMEM;
791 sccb->header.length = sizeof(*sccb);
792 rc = do_sync_request(cmd, sccb);
793 if (rc)
794 goto out;
795 switch (sccb->header.response_code) {
796 case 0x0020:
797 case 0x0120:
798 case 0x0440:
799 case 0x0450:
800 break;
801 default:
802 pr_warning("configure channel-path failed "
803 "(cmd=0x%08x, response=0x%04x)\n", cmd,
804 sccb->header.response_code);
805 rc = -EIO;
806 break;
807 }
808 out:
809 free_page((unsigned long) sccb);
810 return rc;
811 }
812
813 /**
814 * sclp_chp_configure - perform configure channel-path sclp command
815 * @chpid: channel-path ID
816 *
817 * Perform configure channel-path command sclp command for specified chpid.
818 * Return 0 after command successfully finished, non-zero otherwise.
819 */
820 int sclp_chp_configure(struct chp_id chpid)
821 {
822 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
823 }
824
825 /**
826 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
827 * @chpid: channel-path ID
828 *
829 * Perform deconfigure channel-path command sclp command for specified chpid
830 * and wait for completion. On success return 0. Return non-zero otherwise.
831 */
832 int sclp_chp_deconfigure(struct chp_id chpid)
833 {
834 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
835 }
836
837 struct chp_info_sccb {
838 struct sccb_header header;
839 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
840 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
841 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
842 u8 ccm;
843 u8 reserved[6];
844 u8 cssid;
845 } __attribute__((packed));
846
847 /**
848 * sclp_chp_read_info - perform read channel-path information sclp command
849 * @info: resulting channel-path information data
850 *
851 * Perform read channel-path information sclp command and wait for completion.
852 * On success, store channel-path information in @info and return 0. Return
853 * non-zero otherwise.
854 */
855 int sclp_chp_read_info(struct sclp_chp_info *info)
856 {
857 struct chp_info_sccb *sccb;
858 int rc;
859
860 if (!SCLP_HAS_CHP_INFO)
861 return -EOPNOTSUPP;
862 /* Prepare sccb. */
863 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
864 if (!sccb)
865 return -ENOMEM;
866 sccb->header.length = sizeof(*sccb);
867 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
868 if (rc)
869 goto out;
870 if (sccb->header.response_code != 0x0010) {
871 pr_warning("read channel-path info failed "
872 "(response=0x%04x)\n", sccb->header.response_code);
873 rc = -EIO;
874 goto out;
875 }
876 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
877 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
878 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
879 out:
880 free_page((unsigned long) sccb);
881 return rc;
882 }
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