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 unsigned long long rzm;
60 static unsigned long long rnmax;
61
sclp_cmd_sync_early(sclp_cmdw_t cmd,void * sccb)62 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
63 {
64 int rc;
65
66 __ctl_set_bit(0, 9);
67 rc = sclp_service_call(cmd, sccb);
68 if (rc)
69 goto out;
70 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
71 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
72 local_irq_disable();
73 out:
74 /* Contents of the sccb might have changed. */
75 barrier();
76 __ctl_clear_bit(0, 9);
77 return rc;
78 }
79
sclp_read_info_early(void)80 static void __init sclp_read_info_early(void)
81 {
82 int rc;
83 int i;
84 struct read_info_sccb *sccb;
85 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
86 SCLP_CMDW_READ_SCP_INFO};
87
88 sccb = &early_read_info_sccb;
89 for (i = 0; i < ARRAY_SIZE(commands); i++) {
90 do {
91 memset(sccb, 0, sizeof(*sccb));
92 sccb->header.length = sizeof(*sccb);
93 sccb->header.function_code = 0x80;
94 sccb->header.control_mask[2] = 0x80;
95 rc = sclp_cmd_sync_early(commands[i], sccb);
96 } while (rc == -EBUSY);
97
98 if (rc)
99 break;
100 if (sccb->header.response_code == 0x10) {
101 early_read_info_sccb_valid = 1;
102 break;
103 }
104 if (sccb->header.response_code != 0x1f0)
105 break;
106 }
107 }
108
sclp_event_mask_early(void)109 static void __init sclp_event_mask_early(void)
110 {
111 struct init_sccb *sccb = &early_event_mask_sccb;
112 int rc;
113
114 do {
115 memset(sccb, 0, sizeof(*sccb));
116 sccb->header.length = sizeof(*sccb);
117 sccb->mask_length = sizeof(sccb_mask_t);
118 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
119 } while (rc == -EBUSY);
120 }
121
sclp_facilities_detect(void)122 void __init sclp_facilities_detect(void)
123 {
124 struct read_info_sccb *sccb;
125
126 sclp_read_info_early();
127 if (!early_read_info_sccb_valid)
128 return;
129
130 sccb = &early_read_info_sccb;
131 sclp_facilities = sccb->facilities;
132 sclp_fac84 = sccb->fac84;
133 if (sccb->fac85 & 0x02)
134 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
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
sclp_has_linemode(void)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
sclp_has_vt220(void)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
sclp_get_rnmax(void)164 unsigned long long sclp_get_rnmax(void)
165 {
166 return rnmax;
167 }
168
sclp_get_rzm(void)169 unsigned long long sclp_get_rzm(void)
170 {
171 return rzm;
172 }
173
174 /*
175 * This function will be called after sclp_facilities_detect(), which gets
176 * called from early.c code. Therefore the sccb should have valid contents.
177 */
sclp_get_ipl_info(struct sclp_ipl_info * info)178 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
179 {
180 struct read_info_sccb *sccb;
181
182 if (!early_read_info_sccb_valid)
183 return;
184 sccb = &early_read_info_sccb;
185 info->is_valid = 1;
186 if (sccb->flags & 0x2)
187 info->has_dump = 1;
188 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
189 }
190
sclp_sync_callback(struct sclp_req * req,void * data)191 static void sclp_sync_callback(struct sclp_req *req, void *data)
192 {
193 struct completion *completion = data;
194
195 complete(completion);
196 }
197
do_sync_request(sclp_cmdw_t cmd,void * sccb)198 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
199 {
200 struct completion completion;
201 struct sclp_req *request;
202 int rc;
203
204 request = kzalloc(sizeof(*request), GFP_KERNEL);
205 if (!request)
206 return -ENOMEM;
207 request->command = cmd;
208 request->sccb = sccb;
209 request->status = SCLP_REQ_FILLED;
210 request->callback = sclp_sync_callback;
211 request->callback_data = &completion;
212 init_completion(&completion);
213
214 /* Perform sclp request. */
215 rc = sclp_add_request(request);
216 if (rc)
217 goto out;
218 wait_for_completion(&completion);
219
220 /* Check response. */
221 if (request->status != SCLP_REQ_DONE) {
222 pr_warning("sync request failed (cmd=0x%08x, "
223 "status=0x%02x)\n", cmd, request->status);
224 rc = -EIO;
225 }
226 out:
227 kfree(request);
228 return rc;
229 }
230
231 /*
232 * CPU configuration related functions.
233 */
234
235 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
236 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
237 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
238
239 struct read_cpu_info_sccb {
240 struct sccb_header header;
241 u16 nr_configured;
242 u16 offset_configured;
243 u16 nr_standby;
244 u16 offset_standby;
245 u8 reserved[4096 - 16];
246 } __attribute__((packed, aligned(PAGE_SIZE)));
247
sclp_fill_cpu_info(struct sclp_cpu_info * info,struct read_cpu_info_sccb * sccb)248 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
249 struct read_cpu_info_sccb *sccb)
250 {
251 char *page = (char *) sccb;
252
253 memset(info, 0, sizeof(*info));
254 info->configured = sccb->nr_configured;
255 info->standby = sccb->nr_standby;
256 info->combined = sccb->nr_configured + sccb->nr_standby;
257 info->has_cpu_type = sclp_fac84 & 0x1;
258 memcpy(&info->cpu, page + sccb->offset_configured,
259 info->combined * sizeof(struct sclp_cpu_entry));
260 }
261
sclp_get_cpu_info(struct sclp_cpu_info * info)262 int sclp_get_cpu_info(struct sclp_cpu_info *info)
263 {
264 int rc;
265 struct read_cpu_info_sccb *sccb;
266
267 if (!SCLP_HAS_CPU_INFO)
268 return -EOPNOTSUPP;
269 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
270 if (!sccb)
271 return -ENOMEM;
272 sccb->header.length = sizeof(*sccb);
273 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
274 if (rc)
275 goto out;
276 if (sccb->header.response_code != 0x0010) {
277 pr_warning("readcpuinfo failed (response=0x%04x)\n",
278 sccb->header.response_code);
279 rc = -EIO;
280 goto out;
281 }
282 sclp_fill_cpu_info(info, sccb);
283 out:
284 free_page((unsigned long) sccb);
285 return rc;
286 }
287
288 struct cpu_configure_sccb {
289 struct sccb_header header;
290 } __attribute__((packed, aligned(8)));
291
do_cpu_configure(sclp_cmdw_t cmd)292 static int do_cpu_configure(sclp_cmdw_t cmd)
293 {
294 struct cpu_configure_sccb *sccb;
295 int rc;
296
297 if (!SCLP_HAS_CPU_RECONFIG)
298 return -EOPNOTSUPP;
299 /*
300 * This is not going to cross a page boundary since we force
301 * kmalloc to have a minimum alignment of 8 bytes on s390.
302 */
303 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
304 if (!sccb)
305 return -ENOMEM;
306 sccb->header.length = sizeof(*sccb);
307 rc = do_sync_request(cmd, sccb);
308 if (rc)
309 goto out;
310 switch (sccb->header.response_code) {
311 case 0x0020:
312 case 0x0120:
313 break;
314 default:
315 pr_warning("configure cpu failed (cmd=0x%08x, "
316 "response=0x%04x)\n", cmd,
317 sccb->header.response_code);
318 rc = -EIO;
319 break;
320 }
321 out:
322 kfree(sccb);
323 return rc;
324 }
325
sclp_cpu_configure(u8 cpu)326 int sclp_cpu_configure(u8 cpu)
327 {
328 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
329 }
330
sclp_cpu_deconfigure(u8 cpu)331 int sclp_cpu_deconfigure(u8 cpu)
332 {
333 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
334 }
335
336 #ifdef CONFIG_MEMORY_HOTPLUG
337
338 static DEFINE_MUTEX(sclp_mem_mutex);
339 static LIST_HEAD(sclp_mem_list);
340 static u8 sclp_max_storage_id;
341 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
342 static int sclp_mem_state_changed;
343
344 struct memory_increment {
345 struct list_head list;
346 u16 rn;
347 int standby;
348 };
349
350 struct assign_storage_sccb {
351 struct sccb_header header;
352 u16 rn;
353 } __packed;
354
arch_get_memory_phys_device(unsigned long start_pfn)355 int arch_get_memory_phys_device(unsigned long start_pfn)
356 {
357 if (!rzm)
358 return 0;
359 return PFN_PHYS(start_pfn) >> ilog2(rzm);
360 }
361
rn2addr(u16 rn)362 static unsigned long long rn2addr(u16 rn)
363 {
364 return (unsigned long long) (rn - 1) * rzm;
365 }
366
do_assign_storage(sclp_cmdw_t cmd,u16 rn)367 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
368 {
369 struct assign_storage_sccb *sccb;
370 int rc;
371
372 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
373 if (!sccb)
374 return -ENOMEM;
375 sccb->header.length = PAGE_SIZE;
376 sccb->rn = rn;
377 rc = do_sync_request(cmd, sccb);
378 if (rc)
379 goto out;
380 switch (sccb->header.response_code) {
381 case 0x0020:
382 case 0x0120:
383 break;
384 default:
385 pr_warning("assign storage failed (cmd=0x%08x, "
386 "response=0x%04x, rn=0x%04x)\n", cmd,
387 sccb->header.response_code, rn);
388 rc = -EIO;
389 break;
390 }
391 out:
392 free_page((unsigned long) sccb);
393 return rc;
394 }
395
sclp_assign_storage(u16 rn)396 static int sclp_assign_storage(u16 rn)
397 {
398 unsigned long long start;
399 int rc;
400
401 rc = do_assign_storage(0x000d0001, rn);
402 if (rc)
403 return rc;
404 start = rn2addr(rn);
405 storage_key_init_range(start, start + rzm);
406 return 0;
407 }
408
sclp_unassign_storage(u16 rn)409 static int sclp_unassign_storage(u16 rn)
410 {
411 return do_assign_storage(0x000c0001, rn);
412 }
413
414 struct attach_storage_sccb {
415 struct sccb_header header;
416 u16 :16;
417 u16 assigned;
418 u32 :32;
419 u32 entries[0];
420 } __packed;
421
sclp_attach_storage(u8 id)422 static int sclp_attach_storage(u8 id)
423 {
424 struct attach_storage_sccb *sccb;
425 int rc;
426 int i;
427
428 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
429 if (!sccb)
430 return -ENOMEM;
431 sccb->header.length = PAGE_SIZE;
432 rc = do_sync_request(0x00080001 | id << 8, sccb);
433 if (rc)
434 goto out;
435 switch (sccb->header.response_code) {
436 case 0x0020:
437 set_bit(id, sclp_storage_ids);
438 for (i = 0; i < sccb->assigned; i++) {
439 if (sccb->entries[i])
440 sclp_unassign_storage(sccb->entries[i] >> 16);
441 }
442 break;
443 default:
444 rc = -EIO;
445 break;
446 }
447 out:
448 free_page((unsigned long) sccb);
449 return rc;
450 }
451
sclp_mem_change_state(unsigned long start,unsigned long size,int online)452 static int sclp_mem_change_state(unsigned long start, unsigned long size,
453 int online)
454 {
455 struct memory_increment *incr;
456 unsigned long long istart;
457 int rc = 0;
458
459 list_for_each_entry(incr, &sclp_mem_list, list) {
460 istart = rn2addr(incr->rn);
461 if (start + size - 1 < istart)
462 break;
463 if (start > istart + rzm - 1)
464 continue;
465 if (online)
466 rc |= sclp_assign_storage(incr->rn);
467 else
468 sclp_unassign_storage(incr->rn);
469 }
470 return rc ? -EIO : 0;
471 }
472
sclp_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)473 static int sclp_mem_notifier(struct notifier_block *nb,
474 unsigned long action, void *data)
475 {
476 unsigned long start, size;
477 struct memory_notify *arg;
478 unsigned char id;
479 int rc = 0;
480
481 arg = data;
482 start = arg->start_pfn << PAGE_SHIFT;
483 size = arg->nr_pages << PAGE_SHIFT;
484 mutex_lock(&sclp_mem_mutex);
485 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
486 sclp_attach_storage(id);
487 switch (action) {
488 case MEM_ONLINE:
489 case MEM_GOING_OFFLINE:
490 case MEM_CANCEL_OFFLINE:
491 break;
492 case MEM_GOING_ONLINE:
493 rc = sclp_mem_change_state(start, size, 1);
494 break;
495 case MEM_CANCEL_ONLINE:
496 sclp_mem_change_state(start, size, 0);
497 break;
498 case MEM_OFFLINE:
499 sclp_mem_change_state(start, size, 0);
500 break;
501 default:
502 rc = -EINVAL;
503 break;
504 }
505 if (!rc)
506 sclp_mem_state_changed = 1;
507 mutex_unlock(&sclp_mem_mutex);
508 return rc ? NOTIFY_BAD : NOTIFY_OK;
509 }
510
511 static struct notifier_block sclp_mem_nb = {
512 .notifier_call = sclp_mem_notifier,
513 };
514
add_memory_merged(u16 rn)515 static void __init add_memory_merged(u16 rn)
516 {
517 static u16 first_rn, num;
518 unsigned long long start, size;
519
520 if (rn && first_rn && (first_rn + num == rn)) {
521 num++;
522 return;
523 }
524 if (!first_rn)
525 goto skip_add;
526 start = rn2addr(first_rn);
527 size = (unsigned long long ) num * rzm;
528 if (start >= VMEM_MAX_PHYS)
529 goto skip_add;
530 if (start + size > VMEM_MAX_PHYS)
531 size = VMEM_MAX_PHYS - start;
532 if (memory_end_set && (start >= memory_end))
533 goto skip_add;
534 if (memory_end_set && (start + size > memory_end))
535 size = memory_end - start;
536 add_memory(0, start, size);
537 skip_add:
538 first_rn = rn;
539 num = 1;
540 }
541
sclp_add_standby_memory(void)542 static void __init sclp_add_standby_memory(void)
543 {
544 struct memory_increment *incr;
545
546 list_for_each_entry(incr, &sclp_mem_list, list)
547 if (incr->standby)
548 add_memory_merged(incr->rn);
549 add_memory_merged(0);
550 }
551
insert_increment(u16 rn,int standby,int assigned)552 static void __init insert_increment(u16 rn, int standby, int assigned)
553 {
554 struct memory_increment *incr, *new_incr;
555 struct list_head *prev;
556 u16 last_rn;
557
558 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
559 if (!new_incr)
560 return;
561 new_incr->rn = rn;
562 new_incr->standby = standby;
563 last_rn = 0;
564 prev = &sclp_mem_list;
565 list_for_each_entry(incr, &sclp_mem_list, list) {
566 if (assigned && incr->rn > rn)
567 break;
568 if (!assigned && incr->rn - last_rn > 1)
569 break;
570 last_rn = incr->rn;
571 prev = &incr->list;
572 }
573 if (!assigned)
574 new_incr->rn = last_rn + 1;
575 if (new_incr->rn > rnmax) {
576 kfree(new_incr);
577 return;
578 }
579 list_add(&new_incr->list, prev);
580 }
581
sclp_mem_freeze(struct device * dev)582 static int sclp_mem_freeze(struct device *dev)
583 {
584 if (!sclp_mem_state_changed)
585 return 0;
586 pr_err("Memory hotplug state changed, suspend refused.\n");
587 return -EPERM;
588 }
589
590 struct read_storage_sccb {
591 struct sccb_header header;
592 u16 max_id;
593 u16 assigned;
594 u16 standby;
595 u16 :16;
596 u32 entries[0];
597 } __packed;
598
599 static const struct dev_pm_ops sclp_mem_pm_ops = {
600 .freeze = sclp_mem_freeze,
601 };
602
603 static struct platform_driver sclp_mem_pdrv = {
604 .driver = {
605 .name = "sclp_mem",
606 .pm = &sclp_mem_pm_ops,
607 },
608 };
609
sclp_detect_standby_memory(void)610 static int __init sclp_detect_standby_memory(void)
611 {
612 struct platform_device *sclp_pdev;
613 struct read_storage_sccb *sccb;
614 int i, id, assigned, rc;
615
616 if (OLDMEM_BASE) /* No standby memory in kdump mode */
617 return 0;
618 if (!early_read_info_sccb_valid)
619 return 0;
620 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
621 return 0;
622 rc = -ENOMEM;
623 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
624 if (!sccb)
625 goto out;
626 assigned = 0;
627 for (id = 0; id <= sclp_max_storage_id; id++) {
628 memset(sccb, 0, PAGE_SIZE);
629 sccb->header.length = PAGE_SIZE;
630 rc = do_sync_request(0x00040001 | id << 8, sccb);
631 if (rc)
632 goto out;
633 switch (sccb->header.response_code) {
634 case 0x0010:
635 set_bit(id, sclp_storage_ids);
636 for (i = 0; i < sccb->assigned; i++) {
637 if (!sccb->entries[i])
638 continue;
639 assigned++;
640 insert_increment(sccb->entries[i] >> 16, 0, 1);
641 }
642 break;
643 case 0x0310:
644 break;
645 case 0x0410:
646 for (i = 0; i < sccb->assigned; i++) {
647 if (!sccb->entries[i])
648 continue;
649 assigned++;
650 insert_increment(sccb->entries[i] >> 16, 1, 1);
651 }
652 break;
653 default:
654 rc = -EIO;
655 break;
656 }
657 if (!rc)
658 sclp_max_storage_id = sccb->max_id;
659 }
660 if (rc || list_empty(&sclp_mem_list))
661 goto out;
662 for (i = 1; i <= rnmax - assigned; i++)
663 insert_increment(0, 1, 0);
664 rc = register_memory_notifier(&sclp_mem_nb);
665 if (rc)
666 goto out;
667 rc = platform_driver_register(&sclp_mem_pdrv);
668 if (rc)
669 goto out;
670 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
671 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
672 if (rc)
673 goto out_driver;
674 sclp_add_standby_memory();
675 goto out;
676 out_driver:
677 platform_driver_unregister(&sclp_mem_pdrv);
678 out:
679 free_page((unsigned long) sccb);
680 return rc;
681 }
682 __initcall(sclp_detect_standby_memory);
683
684 #endif /* CONFIG_MEMORY_HOTPLUG */
685
686 /*
687 * PCI I/O adapter configuration related functions.
688 */
689 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
690 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
691
692 #define SCLP_RECONFIG_PCI_ATPYE 2
693
694 struct pci_cfg_sccb {
695 struct sccb_header header;
696 u8 atype; /* adapter type */
697 u8 reserved1;
698 u16 reserved2;
699 u32 aid; /* adapter identifier */
700 } __packed;
701
do_pci_configure(sclp_cmdw_t cmd,u32 fid)702 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
703 {
704 struct pci_cfg_sccb *sccb;
705 int rc;
706
707 if (!SCLP_HAS_PCI_RECONFIG)
708 return -EOPNOTSUPP;
709
710 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
711 if (!sccb)
712 return -ENOMEM;
713
714 sccb->header.length = PAGE_SIZE;
715 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
716 sccb->aid = fid;
717 rc = do_sync_request(cmd, sccb);
718 if (rc)
719 goto out;
720 switch (sccb->header.response_code) {
721 case 0x0020:
722 case 0x0120:
723 break;
724 default:
725 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
726 cmd, sccb->header.response_code);
727 rc = -EIO;
728 break;
729 }
730 out:
731 free_page((unsigned long) sccb);
732 return rc;
733 }
734
sclp_pci_configure(u32 fid)735 int sclp_pci_configure(u32 fid)
736 {
737 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
738 }
739 EXPORT_SYMBOL(sclp_pci_configure);
740
sclp_pci_deconfigure(u32 fid)741 int sclp_pci_deconfigure(u32 fid)
742 {
743 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
744 }
745 EXPORT_SYMBOL(sclp_pci_deconfigure);
746
747 /*
748 * Channel path configuration related functions.
749 */
750
751 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
752 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
753 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
754
755 struct chp_cfg_sccb {
756 struct sccb_header header;
757 u8 ccm;
758 u8 reserved[6];
759 u8 cssid;
760 } __attribute__((packed));
761
do_chp_configure(sclp_cmdw_t cmd)762 static int do_chp_configure(sclp_cmdw_t cmd)
763 {
764 struct chp_cfg_sccb *sccb;
765 int rc;
766
767 if (!SCLP_HAS_CHP_RECONFIG)
768 return -EOPNOTSUPP;
769 /* Prepare sccb. */
770 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
771 if (!sccb)
772 return -ENOMEM;
773 sccb->header.length = sizeof(*sccb);
774 rc = do_sync_request(cmd, sccb);
775 if (rc)
776 goto out;
777 switch (sccb->header.response_code) {
778 case 0x0020:
779 case 0x0120:
780 case 0x0440:
781 case 0x0450:
782 break;
783 default:
784 pr_warning("configure channel-path failed "
785 "(cmd=0x%08x, response=0x%04x)\n", cmd,
786 sccb->header.response_code);
787 rc = -EIO;
788 break;
789 }
790 out:
791 free_page((unsigned long) sccb);
792 return rc;
793 }
794
795 /**
796 * sclp_chp_configure - perform configure channel-path sclp command
797 * @chpid: channel-path ID
798 *
799 * Perform configure channel-path command sclp command for specified chpid.
800 * Return 0 after command successfully finished, non-zero otherwise.
801 */
sclp_chp_configure(struct chp_id chpid)802 int sclp_chp_configure(struct chp_id chpid)
803 {
804 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
805 }
806
807 /**
808 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
809 * @chpid: channel-path ID
810 *
811 * Perform deconfigure channel-path command sclp command for specified chpid
812 * and wait for completion. On success return 0. Return non-zero otherwise.
813 */
sclp_chp_deconfigure(struct chp_id chpid)814 int sclp_chp_deconfigure(struct chp_id chpid)
815 {
816 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
817 }
818
819 struct chp_info_sccb {
820 struct sccb_header header;
821 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
822 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
823 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
824 u8 ccm;
825 u8 reserved[6];
826 u8 cssid;
827 } __attribute__((packed));
828
829 /**
830 * sclp_chp_read_info - perform read channel-path information sclp command
831 * @info: resulting channel-path information data
832 *
833 * Perform read channel-path information sclp command and wait for completion.
834 * On success, store channel-path information in @info and return 0. Return
835 * non-zero otherwise.
836 */
sclp_chp_read_info(struct sclp_chp_info * info)837 int sclp_chp_read_info(struct sclp_chp_info *info)
838 {
839 struct chp_info_sccb *sccb;
840 int rc;
841
842 if (!SCLP_HAS_CHP_INFO)
843 return -EOPNOTSUPP;
844 /* Prepare sccb. */
845 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
846 if (!sccb)
847 return -ENOMEM;
848 sccb->header.length = sizeof(*sccb);
849 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
850 if (rc)
851 goto out;
852 if (sccb->header.response_code != 0x0010) {
853 pr_warning("read channel-path info failed "
854 "(response=0x%04x)\n", sccb->header.response_code);
855 rc = -EIO;
856 goto out;
857 }
858 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
859 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
860 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
861 out:
862 free_page((unsigned long) sccb);
863 return rc;
864 }
865