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1/*
2 * Copyright IBM Corp. 2007, 2009
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/slab.h>
16#include <linux/string.h>
17#include <linux/mm.h>
18#include <linux/mmzone.h>
19#include <linux/memory.h>
20#include <linux/platform_device.h>
21#include <asm/chpid.h>
22#include <asm/sclp.h>
23#include <asm/setup.h>
24
25#include "sclp.h"
26
27#define SCLP_CMDW_READ_SCP_INFO 0x00020001
28#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
29
30struct read_info_sccb {
31 struct sccb_header header; /* 0-7 */
32 u16 rnmax; /* 8-9 */
33 u8 rnsize; /* 10 */
34 u8 _reserved0[24 - 11]; /* 11-15 */
35 u8 loadparm[8]; /* 24-31 */
36 u8 _reserved1[48 - 32]; /* 32-47 */
37 u64 facilities; /* 48-55 */
38 u8 _reserved2[84 - 56]; /* 56-83 */
39 u8 fac84; /* 84 */
40 u8 _reserved3[91 - 85]; /* 85-90 */
41 u8 flags; /* 91 */
42 u8 _reserved4[100 - 92]; /* 92-99 */
43 u32 rnsize2; /* 100-103 */
44 u64 rnmax2; /* 104-111 */
45 u8 _reserved5[4096 - 112]; /* 112-4095 */
46} __attribute__((packed, aligned(PAGE_SIZE)));
47
48static struct read_info_sccb __initdata early_read_info_sccb;
49static int __initdata early_read_info_sccb_valid;
50
51u64 sclp_facilities;
52static u8 sclp_fac84;
53static unsigned long long rzm;
54static unsigned long long rnmax;
55
56static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
57{
58 int rc;
59
60 __ctl_set_bit(0, 9);
61 rc = sclp_service_call(cmd, sccb);
62 if (rc)
63 goto out;
64 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
65 PSW_MASK_WAIT | PSW_DEFAULT_KEY);
66 local_irq_disable();
67out:
68 /* Contents of the sccb might have changed. */
69 barrier();
70 __ctl_clear_bit(0, 9);
71 return rc;
72}
73
74static void __init sclp_read_info_early(void)
75{
76 int rc;
77 int i;
78 struct read_info_sccb *sccb;
79 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
80 SCLP_CMDW_READ_SCP_INFO};
81
82 sccb = &early_read_info_sccb;
83 for (i = 0; i < ARRAY_SIZE(commands); i++) {
84 do {
85 memset(sccb, 0, sizeof(*sccb));
86 sccb->header.length = sizeof(*sccb);
87 sccb->header.function_code = 0x80;
88 sccb->header.control_mask[2] = 0x80;
89 rc = sclp_cmd_sync_early(commands[i], sccb);
90 } while (rc == -EBUSY);
91
92 if (rc)
93 break;
94 if (sccb->header.response_code == 0x10) {
95 early_read_info_sccb_valid = 1;
96 break;
97 }
98 if (sccb->header.response_code != 0x1f0)
99 break;
100 }
101}
102
103void __init sclp_facilities_detect(void)
104{
105 struct read_info_sccb *sccb;
106
107 sclp_read_info_early();
108 if (!early_read_info_sccb_valid)
109 return;
110
111 sccb = &early_read_info_sccb;
112 sclp_facilities = sccb->facilities;
113 sclp_fac84 = sccb->fac84;
114 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
115 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
116 rzm <<= 20;
117}
118
119unsigned long long sclp_get_rnmax(void)
120{
121 return rnmax;
122}
123
124unsigned long long sclp_get_rzm(void)
125{
126 return rzm;
127}
128
129/*
130 * This function will be called after sclp_facilities_detect(), which gets
131 * called from early.c code. Therefore the sccb should have valid contents.
132 */
133void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
134{
135 struct read_info_sccb *sccb;
136
137 if (!early_read_info_sccb_valid)
138 return;
139 sccb = &early_read_info_sccb;
140 info->is_valid = 1;
141 if (sccb->flags & 0x2)
142 info->has_dump = 1;
143 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
144}
145
146static void sclp_sync_callback(struct sclp_req *req, void *data)
147{
148 struct completion *completion = data;
149
150 complete(completion);
151}
152
153static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
154{
155 struct completion completion;
156 struct sclp_req *request;
157 int rc;
158
159 request = kzalloc(sizeof(*request), GFP_KERNEL);
160 if (!request)
161 return -ENOMEM;
162 request->command = cmd;
163 request->sccb = sccb;
164 request->status = SCLP_REQ_FILLED;
165 request->callback = sclp_sync_callback;
166 request->callback_data = &completion;
167 init_completion(&completion);
168
169 /* Perform sclp request. */
170 rc = sclp_add_request(request);
171 if (rc)
172 goto out;
173 wait_for_completion(&completion);
174
175 /* Check response. */
176 if (request->status != SCLP_REQ_DONE) {
177 pr_warning("sync request failed (cmd=0x%08x, "
178 "status=0x%02x)\n", cmd, request->status);
179 rc = -EIO;
180 }
181out:
182 kfree(request);
183 return rc;
184}
185
186/*
187 * CPU configuration related functions.
188 */
189
190#define SCLP_CMDW_READ_CPU_INFO 0x00010001
191#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
192#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
193
194struct read_cpu_info_sccb {
195 struct sccb_header header;
196 u16 nr_configured;
197 u16 offset_configured;
198 u16 nr_standby;
199 u16 offset_standby;
200 u8 reserved[4096 - 16];
201} __attribute__((packed, aligned(PAGE_SIZE)));
202
203static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
204 struct read_cpu_info_sccb *sccb)
205{
206 char *page = (char *) sccb;
207
208 memset(info, 0, sizeof(*info));
209 info->configured = sccb->nr_configured;
210 info->standby = sccb->nr_standby;
211 info->combined = sccb->nr_configured + sccb->nr_standby;
212 info->has_cpu_type = sclp_fac84 & 0x1;
213 memcpy(&info->cpu, page + sccb->offset_configured,
214 info->combined * sizeof(struct sclp_cpu_entry));
215}
216
217int sclp_get_cpu_info(struct sclp_cpu_info *info)
218{
219 int rc;
220 struct read_cpu_info_sccb *sccb;
221
222 if (!SCLP_HAS_CPU_INFO)
223 return -EOPNOTSUPP;
224 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
225 if (!sccb)
226 return -ENOMEM;
227 sccb->header.length = sizeof(*sccb);
228 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
229 if (rc)
230 goto out;
231 if (sccb->header.response_code != 0x0010) {
232 pr_warning("readcpuinfo failed (response=0x%04x)\n",
233 sccb->header.response_code);
234 rc = -EIO;
235 goto out;
236 }
237 sclp_fill_cpu_info(info, sccb);
238out:
239 free_page((unsigned long) sccb);
240 return rc;
241}
242
243struct cpu_configure_sccb {
244 struct sccb_header header;
245} __attribute__((packed, aligned(8)));
246
247static int do_cpu_configure(sclp_cmdw_t cmd)
248{
249 struct cpu_configure_sccb *sccb;
250 int rc;
251
252 if (!SCLP_HAS_CPU_RECONFIG)
253 return -EOPNOTSUPP;
254 /*
255 * This is not going to cross a page boundary since we force
256 * kmalloc to have a minimum alignment of 8 bytes on s390.
257 */
258 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
259 if (!sccb)
260 return -ENOMEM;
261 sccb->header.length = sizeof(*sccb);
262 rc = do_sync_request(cmd, sccb);
263 if (rc)
264 goto out;
265 switch (sccb->header.response_code) {
266 case 0x0020:
267 case 0x0120:
268 break;
269 default:
270 pr_warning("configure cpu failed (cmd=0x%08x, "
271 "response=0x%04x)\n", cmd,
272 sccb->header.response_code);
273 rc = -EIO;
274 break;
275 }
276out:
277 kfree(sccb);
278 return rc;
279}
280
281int sclp_cpu_configure(u8 cpu)
282{
283 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
284}
285
286int sclp_cpu_deconfigure(u8 cpu)
287{
288 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
289}
290
291#ifdef CONFIG_MEMORY_HOTPLUG
292
293static DEFINE_MUTEX(sclp_mem_mutex);
294static LIST_HEAD(sclp_mem_list);
295static u8 sclp_max_storage_id;
296static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
297static int sclp_mem_state_changed;
298
299struct memory_increment {
300 struct list_head list;
301 u16 rn;
302 int standby;
303 int usecount;
304};
305
306struct assign_storage_sccb {
307 struct sccb_header header;
308 u16 rn;
309} __packed;
310
311int arch_get_memory_phys_device(unsigned long start_pfn)
312{
313 if (!rzm)
314 return 0;
315 return PFN_PHYS(start_pfn) >> ilog2(rzm);
316}
317
318static unsigned long long rn2addr(u16 rn)
319{
320 return (unsigned long long) (rn - 1) * rzm;
321}
322
323static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
324{
325 struct assign_storage_sccb *sccb;
326 int rc;
327
328 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
329 if (!sccb)
330 return -ENOMEM;
331 sccb->header.length = PAGE_SIZE;
332 sccb->rn = rn;
333 rc = do_sync_request(cmd, sccb);
334 if (rc)
335 goto out;
336 switch (sccb->header.response_code) {
337 case 0x0020:
338 case 0x0120:
339 break;
340 default:
341 pr_warning("assign storage failed (cmd=0x%08x, "
342 "response=0x%04x, rn=0x%04x)\n", cmd,
343 sccb->header.response_code, rn);
344 rc = -EIO;
345 break;
346 }
347out:
348 free_page((unsigned long) sccb);
349 return rc;
350}
351
352static int sclp_assign_storage(u16 rn)
353{
354 return do_assign_storage(0x000d0001, rn);
355}
356
357static int sclp_unassign_storage(u16 rn)
358{
359 return do_assign_storage(0x000c0001, rn);
360}
361
362struct attach_storage_sccb {
363 struct sccb_header header;
364 u16 :16;
365 u16 assigned;
366 u32 :32;
367 u32 entries[0];
368} __packed;
369
370static int sclp_attach_storage(u8 id)
371{
372 struct attach_storage_sccb *sccb;
373 int rc;
374 int i;
375
376 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
377 if (!sccb)
378 return -ENOMEM;
379 sccb->header.length = PAGE_SIZE;
380 rc = do_sync_request(0x00080001 | id << 8, sccb);
381 if (rc)
382 goto out;
383 switch (sccb->header.response_code) {
384 case 0x0020:
385 set_bit(id, sclp_storage_ids);
386 for (i = 0; i < sccb->assigned; i++) {
387 if (sccb->entries[i])
388 sclp_unassign_storage(sccb->entries[i] >> 16);
389 }
390 break;
391 default:
392 rc = -EIO;
393 break;
394 }
395out:
396 free_page((unsigned long) sccb);
397 return rc;
398}
399
400static int sclp_mem_change_state(unsigned long start, unsigned long size,
401 int online)
402{
403 struct memory_increment *incr;
404 unsigned long long istart;
405 int rc = 0;
406
407 list_for_each_entry(incr, &sclp_mem_list, list) {
408 istart = rn2addr(incr->rn);
409 if (start + size - 1 < istart)
410 break;
411 if (start > istart + rzm - 1)
412 continue;
413 if (online) {
414 if (incr->usecount++)
415 continue;
416 /*
417 * Don't break the loop if one assign fails. Loop may
418 * be walked again on CANCEL and we can't save
419 * information if state changed before or not.
420 * So continue and increase usecount for all increments.
421 */
422 rc |= sclp_assign_storage(incr->rn);
423 } else {
424 if (--incr->usecount)
425 continue;
426 sclp_unassign_storage(incr->rn);
427 }
428 }
429 return rc ? -EIO : 0;
430}
431
432static int sclp_mem_notifier(struct notifier_block *nb,
433 unsigned long action, void *data)
434{
435 unsigned long start, size;
436 struct memory_notify *arg;
437 unsigned char id;
438 int rc = 0;
439
440 arg = data;
441 start = arg->start_pfn << PAGE_SHIFT;
442 size = arg->nr_pages << PAGE_SHIFT;
443 mutex_lock(&sclp_mem_mutex);
444 for (id = 0; id <= sclp_max_storage_id; id++)
445 if (!test_bit(id, sclp_storage_ids))
446 sclp_attach_storage(id);
447 switch (action) {
448 case MEM_ONLINE:
449 case MEM_GOING_OFFLINE:
450 case MEM_CANCEL_OFFLINE:
451 break;
452 case MEM_GOING_ONLINE:
453 rc = sclp_mem_change_state(start, size, 1);
454 break;
455 case MEM_CANCEL_ONLINE:
456 sclp_mem_change_state(start, size, 0);
457 break;
458 case MEM_OFFLINE:
459 sclp_mem_change_state(start, size, 0);
460 break;
461 default:
462 rc = -EINVAL;
463 break;
464 }
465 if (!rc)
466 sclp_mem_state_changed = 1;
467 mutex_unlock(&sclp_mem_mutex);
468 return rc ? NOTIFY_BAD : NOTIFY_OK;
469}
470
471static struct notifier_block sclp_mem_nb = {
472 .notifier_call = sclp_mem_notifier,
473};
474
475static void __init add_memory_merged(u16 rn)
476{
477 static u16 first_rn, num;
478 unsigned long long start, size;
479
480 if (rn && first_rn && (first_rn + num == rn)) {
481 num++;
482 return;
483 }
484 if (!first_rn)
485 goto skip_add;
486 start = rn2addr(first_rn);
487 size = (unsigned long long ) num * rzm;
488 if (start >= VMEM_MAX_PHYS)
489 goto skip_add;
490 if (start + size > VMEM_MAX_PHYS)
491 size = VMEM_MAX_PHYS - start;
492 if (memory_end_set && (start >= memory_end))
493 goto skip_add;
494 if (memory_end_set && (start + size > memory_end))
495 size = memory_end - start;
496 add_memory(0, start, size);
497skip_add:
498 first_rn = rn;
499 num = 1;
500}
501
502static void __init sclp_add_standby_memory(void)
503{
504 struct memory_increment *incr;
505
506 list_for_each_entry(incr, &sclp_mem_list, list)
507 if (incr->standby)
508 add_memory_merged(incr->rn);
509 add_memory_merged(0);
510}
511
512static void __init insert_increment(u16 rn, int standby, int assigned)
513{
514 struct memory_increment *incr, *new_incr;
515 struct list_head *prev;
516 u16 last_rn;
517
518 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
519 if (!new_incr)
520 return;
521 new_incr->rn = rn;
522 new_incr->standby = standby;
523 if (!standby)
524 new_incr->usecount = 1;
525 last_rn = 0;
526 prev = &sclp_mem_list;
527 list_for_each_entry(incr, &sclp_mem_list, list) {
528 if (assigned && incr->rn > rn)
529 break;
530 if (!assigned && incr->rn - last_rn > 1)
531 break;
532 last_rn = incr->rn;
533 prev = &incr->list;
534 }
535 if (!assigned)
536 new_incr->rn = last_rn + 1;
537 if (new_incr->rn > rnmax) {
538 kfree(new_incr);
539 return;
540 }
541 list_add(&new_incr->list, prev);
542}
543
544static int sclp_mem_freeze(struct device *dev)
545{
546 if (!sclp_mem_state_changed)
547 return 0;
548 pr_err("Memory hotplug state changed, suspend refused.\n");
549 return -EPERM;
550}
551
552struct read_storage_sccb {
553 struct sccb_header header;
554 u16 max_id;
555 u16 assigned;
556 u16 standby;
557 u16 :16;
558 u32 entries[0];
559} __packed;
560
561static const struct dev_pm_ops sclp_mem_pm_ops = {
562 .freeze = sclp_mem_freeze,
563};
564
565static struct platform_driver sclp_mem_pdrv = {
566 .driver = {
567 .name = "sclp_mem",
568 .pm = &sclp_mem_pm_ops,
569 },
570};
571
572static int __init sclp_detect_standby_memory(void)
573{
574 struct platform_device *sclp_pdev;
575 struct read_storage_sccb *sccb;
576 int i, id, assigned, rc;
577
578 if (!early_read_info_sccb_valid)
579 return 0;
580 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
581 return 0;
582 rc = -ENOMEM;
583 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
584 if (!sccb)
585 goto out;
586 assigned = 0;
587 for (id = 0; id <= sclp_max_storage_id; id++) {
588 memset(sccb, 0, PAGE_SIZE);
589 sccb->header.length = PAGE_SIZE;
590 rc = do_sync_request(0x00040001 | id << 8, sccb);
591 if (rc)
592 goto out;
593 switch (sccb->header.response_code) {
594 case 0x0010:
595 set_bit(id, sclp_storage_ids);
596 for (i = 0; i < sccb->assigned; i++) {
597 if (!sccb->entries[i])
598 continue;
599 assigned++;
600 insert_increment(sccb->entries[i] >> 16, 0, 1);
601 }
602 break;
603 case 0x0310:
604 break;
605 case 0x0410:
606 for (i = 0; i < sccb->assigned; i++) {
607 if (!sccb->entries[i])
608 continue;
609 assigned++;
610 insert_increment(sccb->entries[i] >> 16, 1, 1);
611 }
612 break;
613 default:
614 rc = -EIO;
615 break;
616 }
617 if (!rc)
618 sclp_max_storage_id = sccb->max_id;
619 }
620 if (rc || list_empty(&sclp_mem_list))
621 goto out;
622 for (i = 1; i <= rnmax - assigned; i++)
623 insert_increment(0, 1, 0);
624 rc = register_memory_notifier(&sclp_mem_nb);
625 if (rc)
626 goto out;
627 rc = platform_driver_register(&sclp_mem_pdrv);
628 if (rc)
629 goto out;
630 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
631 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
632 if (rc)
633 goto out_driver;
634 sclp_add_standby_memory();
635 goto out;
636out_driver:
637 platform_driver_unregister(&sclp_mem_pdrv);
638out:
639 free_page((unsigned long) sccb);
640 return rc;
641}
642__initcall(sclp_detect_standby_memory);
643
644#endif /* CONFIG_MEMORY_HOTPLUG */
645
646/*
647 * Channel path configuration related functions.
648 */
649
650#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
651#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
652#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
653
654struct chp_cfg_sccb {
655 struct sccb_header header;
656 u8 ccm;
657 u8 reserved[6];
658 u8 cssid;
659} __attribute__((packed));
660
661static int do_chp_configure(sclp_cmdw_t cmd)
662{
663 struct chp_cfg_sccb *sccb;
664 int rc;
665
666 if (!SCLP_HAS_CHP_RECONFIG)
667 return -EOPNOTSUPP;
668 /* Prepare sccb. */
669 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
670 if (!sccb)
671 return -ENOMEM;
672 sccb->header.length = sizeof(*sccb);
673 rc = do_sync_request(cmd, sccb);
674 if (rc)
675 goto out;
676 switch (sccb->header.response_code) {
677 case 0x0020:
678 case 0x0120:
679 case 0x0440:
680 case 0x0450:
681 break;
682 default:
683 pr_warning("configure channel-path failed "
684 "(cmd=0x%08x, response=0x%04x)\n", cmd,
685 sccb->header.response_code);
686 rc = -EIO;
687 break;
688 }
689out:
690 free_page((unsigned long) sccb);
691 return rc;
692}
693
694/**
695 * sclp_chp_configure - perform configure channel-path sclp command
696 * @chpid: channel-path ID
697 *
698 * Perform configure channel-path command sclp command for specified chpid.
699 * Return 0 after command successfully finished, non-zero otherwise.
700 */
701int sclp_chp_configure(struct chp_id chpid)
702{
703 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
704}
705
706/**
707 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
708 * @chpid: channel-path ID
709 *
710 * Perform deconfigure channel-path command sclp command for specified chpid
711 * and wait for completion. On success return 0. Return non-zero otherwise.
712 */
713int sclp_chp_deconfigure(struct chp_id chpid)
714{
715 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
716}
717
718struct chp_info_sccb {
719 struct sccb_header header;
720 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
721 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
722 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
723 u8 ccm;
724 u8 reserved[6];
725 u8 cssid;
726} __attribute__((packed));
727
728/**
729 * sclp_chp_read_info - perform read channel-path information sclp command
730 * @info: resulting channel-path information data
731 *
732 * Perform read channel-path information sclp command and wait for completion.
733 * On success, store channel-path information in @info and return 0. Return
734 * non-zero otherwise.
735 */
736int sclp_chp_read_info(struct sclp_chp_info *info)
737{
738 struct chp_info_sccb *sccb;
739 int rc;
740
741 if (!SCLP_HAS_CHP_INFO)
742 return -EOPNOTSUPP;
743 /* Prepare sccb. */
744 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
745 if (!sccb)
746 return -ENOMEM;
747 sccb->header.length = sizeof(*sccb);
748 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
749 if (rc)
750 goto out;
751 if (sccb->header.response_code != 0x0010) {
752 pr_warning("read channel-path info failed "
753 "(response=0x%04x)\n", sccb->header.response_code);
754 rc = -EIO;
755 goto out;
756 }
757 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
758 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
759 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
760out:
761 free_page((unsigned long) sccb);
762 return rc;
763}
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#include <asm/numa.h>
29
30#include "sclp.h"
31
32static void sclp_sync_callback(struct sclp_req *req, void *data)
33{
34 struct completion *completion = data;
35
36 complete(completion);
37}
38
39int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
40{
41 return sclp_sync_request_timeout(cmd, sccb, 0);
42}
43
44int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
45{
46 struct completion completion;
47 struct sclp_req *request;
48 int rc;
49
50 request = kzalloc(sizeof(*request), GFP_KERNEL);
51 if (!request)
52 return -ENOMEM;
53 if (timeout)
54 request->queue_timeout = timeout;
55 request->command = cmd;
56 request->sccb = sccb;
57 request->status = SCLP_REQ_FILLED;
58 request->callback = sclp_sync_callback;
59 request->callback_data = &completion;
60 init_completion(&completion);
61
62 /* Perform sclp request. */
63 rc = sclp_add_request(request);
64 if (rc)
65 goto out;
66 wait_for_completion(&completion);
67
68 /* Check response. */
69 if (request->status != SCLP_REQ_DONE) {
70 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
71 cmd, request->status);
72 rc = -EIO;
73 }
74out:
75 kfree(request);
76 return rc;
77}
78
79/*
80 * CPU configuration related functions.
81 */
82
83#define SCLP_CMDW_READ_CPU_INFO 0x00010001
84#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
85#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
86
87struct read_cpu_info_sccb {
88 struct sccb_header header;
89 u16 nr_configured;
90 u16 offset_configured;
91 u16 nr_standby;
92 u16 offset_standby;
93 u8 reserved[4096 - 16];
94} __attribute__((packed, aligned(PAGE_SIZE)));
95
96static void sclp_fill_core_info(struct sclp_core_info *info,
97 struct read_cpu_info_sccb *sccb)
98{
99 char *page = (char *) sccb;
100
101 memset(info, 0, sizeof(*info));
102 info->configured = sccb->nr_configured;
103 info->standby = sccb->nr_standby;
104 info->combined = sccb->nr_configured + sccb->nr_standby;
105 memcpy(&info->core, page + sccb->offset_configured,
106 info->combined * sizeof(struct sclp_core_entry));
107}
108
109int sclp_get_core_info(struct sclp_core_info *info)
110{
111 int rc;
112 struct read_cpu_info_sccb *sccb;
113
114 if (!SCLP_HAS_CPU_INFO)
115 return -EOPNOTSUPP;
116 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
117 if (!sccb)
118 return -ENOMEM;
119 sccb->header.length = sizeof(*sccb);
120 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
121 SCLP_QUEUE_INTERVAL);
122 if (rc)
123 goto out;
124 if (sccb->header.response_code != 0x0010) {
125 pr_warn("readcpuinfo failed (response=0x%04x)\n",
126 sccb->header.response_code);
127 rc = -EIO;
128 goto out;
129 }
130 sclp_fill_core_info(info, sccb);
131out:
132 free_page((unsigned long) sccb);
133 return rc;
134}
135
136struct cpu_configure_sccb {
137 struct sccb_header header;
138} __attribute__((packed, aligned(8)));
139
140static int do_core_configure(sclp_cmdw_t cmd)
141{
142 struct cpu_configure_sccb *sccb;
143 int rc;
144
145 if (!SCLP_HAS_CPU_RECONFIG)
146 return -EOPNOTSUPP;
147 /*
148 * This is not going to cross a page boundary since we force
149 * kmalloc to have a minimum alignment of 8 bytes on s390.
150 */
151 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
152 if (!sccb)
153 return -ENOMEM;
154 sccb->header.length = sizeof(*sccb);
155 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
156 if (rc)
157 goto out;
158 switch (sccb->header.response_code) {
159 case 0x0020:
160 case 0x0120:
161 break;
162 default:
163 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
164 cmd, sccb->header.response_code);
165 rc = -EIO;
166 break;
167 }
168out:
169 kfree(sccb);
170 return rc;
171}
172
173int sclp_core_configure(u8 core)
174{
175 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
176}
177
178int sclp_core_deconfigure(u8 core)
179{
180 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
181}
182
183#ifdef CONFIG_MEMORY_HOTPLUG
184
185static DEFINE_MUTEX(sclp_mem_mutex);
186static LIST_HEAD(sclp_mem_list);
187static u8 sclp_max_storage_id;
188static DECLARE_BITMAP(sclp_storage_ids, 256);
189static int sclp_mem_state_changed;
190
191struct memory_increment {
192 struct list_head list;
193 u16 rn;
194 int standby;
195};
196
197struct assign_storage_sccb {
198 struct sccb_header header;
199 u16 rn;
200} __packed;
201
202int arch_get_memory_phys_device(unsigned long start_pfn)
203{
204 if (!sclp.rzm)
205 return 0;
206 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
207}
208
209static unsigned long long rn2addr(u16 rn)
210{
211 return (unsigned long long) (rn - 1) * sclp.rzm;
212}
213
214static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
215{
216 struct assign_storage_sccb *sccb;
217 int rc;
218
219 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
220 if (!sccb)
221 return -ENOMEM;
222 sccb->header.length = PAGE_SIZE;
223 sccb->rn = rn;
224 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
225 if (rc)
226 goto out;
227 switch (sccb->header.response_code) {
228 case 0x0020:
229 case 0x0120:
230 break;
231 default:
232 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
233 cmd, sccb->header.response_code, rn);
234 rc = -EIO;
235 break;
236 }
237out:
238 free_page((unsigned long) sccb);
239 return rc;
240}
241
242static int sclp_assign_storage(u16 rn)
243{
244 unsigned long long start;
245 int rc;
246
247 rc = do_assign_storage(0x000d0001, rn);
248 if (rc)
249 return rc;
250 start = rn2addr(rn);
251 storage_key_init_range(start, start + sclp.rzm);
252 return 0;
253}
254
255static int sclp_unassign_storage(u16 rn)
256{
257 return do_assign_storage(0x000c0001, rn);
258}
259
260struct attach_storage_sccb {
261 struct sccb_header header;
262 u16 :16;
263 u16 assigned;
264 u32 :32;
265 u32 entries[0];
266} __packed;
267
268static int sclp_attach_storage(u8 id)
269{
270 struct attach_storage_sccb *sccb;
271 int rc;
272 int i;
273
274 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
275 if (!sccb)
276 return -ENOMEM;
277 sccb->header.length = PAGE_SIZE;
278 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
279 SCLP_QUEUE_INTERVAL);
280 if (rc)
281 goto out;
282 switch (sccb->header.response_code) {
283 case 0x0020:
284 set_bit(id, sclp_storage_ids);
285 for (i = 0; i < sccb->assigned; i++) {
286 if (sccb->entries[i])
287 sclp_unassign_storage(sccb->entries[i] >> 16);
288 }
289 break;
290 default:
291 rc = -EIO;
292 break;
293 }
294out:
295 free_page((unsigned long) sccb);
296 return rc;
297}
298
299static int sclp_mem_change_state(unsigned long start, unsigned long size,
300 int online)
301{
302 struct memory_increment *incr;
303 unsigned long long istart;
304 int rc = 0;
305
306 list_for_each_entry(incr, &sclp_mem_list, list) {
307 istart = rn2addr(incr->rn);
308 if (start + size - 1 < istart)
309 break;
310 if (start > istart + sclp.rzm - 1)
311 continue;
312 if (online)
313 rc |= sclp_assign_storage(incr->rn);
314 else
315 sclp_unassign_storage(incr->rn);
316 if (rc == 0)
317 incr->standby = online ? 0 : 1;
318 }
319 return rc ? -EIO : 0;
320}
321
322static bool contains_standby_increment(unsigned long start, unsigned long end)
323{
324 struct memory_increment *incr;
325 unsigned long istart;
326
327 list_for_each_entry(incr, &sclp_mem_list, list) {
328 istart = rn2addr(incr->rn);
329 if (end - 1 < istart)
330 continue;
331 if (start > istart + sclp.rzm - 1)
332 continue;
333 if (incr->standby)
334 return true;
335 }
336 return false;
337}
338
339static int sclp_mem_notifier(struct notifier_block *nb,
340 unsigned long action, void *data)
341{
342 unsigned long start, size;
343 struct memory_notify *arg;
344 unsigned char id;
345 int rc = 0;
346
347 arg = data;
348 start = arg->start_pfn << PAGE_SHIFT;
349 size = arg->nr_pages << PAGE_SHIFT;
350 mutex_lock(&sclp_mem_mutex);
351 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
352 sclp_attach_storage(id);
353 switch (action) {
354 case MEM_GOING_OFFLINE:
355 /*
356 * We do not allow to set memory blocks offline that contain
357 * standby memory. This is done to simplify the "memory online"
358 * case.
359 */
360 if (contains_standby_increment(start, start + size))
361 rc = -EPERM;
362 break;
363 case MEM_ONLINE:
364 case MEM_CANCEL_OFFLINE:
365 break;
366 case MEM_GOING_ONLINE:
367 rc = sclp_mem_change_state(start, size, 1);
368 break;
369 case MEM_CANCEL_ONLINE:
370 sclp_mem_change_state(start, size, 0);
371 break;
372 case MEM_OFFLINE:
373 sclp_mem_change_state(start, size, 0);
374 break;
375 default:
376 rc = -EINVAL;
377 break;
378 }
379 if (!rc)
380 sclp_mem_state_changed = 1;
381 mutex_unlock(&sclp_mem_mutex);
382 return rc ? NOTIFY_BAD : NOTIFY_OK;
383}
384
385static struct notifier_block sclp_mem_nb = {
386 .notifier_call = sclp_mem_notifier,
387};
388
389static void __init align_to_block_size(unsigned long long *start,
390 unsigned long long *size,
391 unsigned long long alignment)
392{
393 unsigned long long start_align, size_align;
394
395 start_align = roundup(*start, alignment);
396 size_align = rounddown(*start + *size, alignment) - start_align;
397
398 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
399 *start, size_align >> 20, *size >> 20);
400 *start = start_align;
401 *size = size_align;
402}
403
404static void __init add_memory_merged(u16 rn)
405{
406 unsigned long long start, size, addr, block_size;
407 static u16 first_rn, num;
408
409 if (rn && first_rn && (first_rn + num == rn)) {
410 num++;
411 return;
412 }
413 if (!first_rn)
414 goto skip_add;
415 start = rn2addr(first_rn);
416 size = (unsigned long long) num * sclp.rzm;
417 if (start >= VMEM_MAX_PHYS)
418 goto skip_add;
419 if (start + size > VMEM_MAX_PHYS)
420 size = VMEM_MAX_PHYS - start;
421 if (memory_end_set && (start >= memory_end))
422 goto skip_add;
423 if (memory_end_set && (start + size > memory_end))
424 size = memory_end - start;
425 block_size = memory_block_size_bytes();
426 align_to_block_size(&start, &size, block_size);
427 if (!size)
428 goto skip_add;
429 for (addr = start; addr < start + size; addr += block_size)
430 add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
431skip_add:
432 first_rn = rn;
433 num = 1;
434}
435
436static void __init sclp_add_standby_memory(void)
437{
438 struct memory_increment *incr;
439
440 list_for_each_entry(incr, &sclp_mem_list, list)
441 if (incr->standby)
442 add_memory_merged(incr->rn);
443 add_memory_merged(0);
444}
445
446static void __init insert_increment(u16 rn, int standby, int assigned)
447{
448 struct memory_increment *incr, *new_incr;
449 struct list_head *prev;
450 u16 last_rn;
451
452 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
453 if (!new_incr)
454 return;
455 new_incr->rn = rn;
456 new_incr->standby = standby;
457 last_rn = 0;
458 prev = &sclp_mem_list;
459 list_for_each_entry(incr, &sclp_mem_list, list) {
460 if (assigned && incr->rn > rn)
461 break;
462 if (!assigned && incr->rn - last_rn > 1)
463 break;
464 last_rn = incr->rn;
465 prev = &incr->list;
466 }
467 if (!assigned)
468 new_incr->rn = last_rn + 1;
469 if (new_incr->rn > sclp.rnmax) {
470 kfree(new_incr);
471 return;
472 }
473 list_add(&new_incr->list, prev);
474}
475
476static int sclp_mem_freeze(struct device *dev)
477{
478 if (!sclp_mem_state_changed)
479 return 0;
480 pr_err("Memory hotplug state changed, suspend refused.\n");
481 return -EPERM;
482}
483
484struct read_storage_sccb {
485 struct sccb_header header;
486 u16 max_id;
487 u16 assigned;
488 u16 standby;
489 u16 :16;
490 u32 entries[0];
491} __packed;
492
493static const struct dev_pm_ops sclp_mem_pm_ops = {
494 .freeze = sclp_mem_freeze,
495};
496
497static struct platform_driver sclp_mem_pdrv = {
498 .driver = {
499 .name = "sclp_mem",
500 .pm = &sclp_mem_pm_ops,
501 },
502};
503
504static int __init sclp_detect_standby_memory(void)
505{
506 struct platform_device *sclp_pdev;
507 struct read_storage_sccb *sccb;
508 int i, id, assigned, rc;
509
510 if (OLDMEM_BASE) /* No standby memory in kdump mode */
511 return 0;
512 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
513 return 0;
514 rc = -ENOMEM;
515 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
516 if (!sccb)
517 goto out;
518 assigned = 0;
519 for (id = 0; id <= sclp_max_storage_id; id++) {
520 memset(sccb, 0, PAGE_SIZE);
521 sccb->header.length = PAGE_SIZE;
522 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
523 if (rc)
524 goto out;
525 switch (sccb->header.response_code) {
526 case 0x0010:
527 set_bit(id, sclp_storage_ids);
528 for (i = 0; i < sccb->assigned; i++) {
529 if (!sccb->entries[i])
530 continue;
531 assigned++;
532 insert_increment(sccb->entries[i] >> 16, 0, 1);
533 }
534 break;
535 case 0x0310:
536 break;
537 case 0x0410:
538 for (i = 0; i < sccb->assigned; i++) {
539 if (!sccb->entries[i])
540 continue;
541 assigned++;
542 insert_increment(sccb->entries[i] >> 16, 1, 1);
543 }
544 break;
545 default:
546 rc = -EIO;
547 break;
548 }
549 if (!rc)
550 sclp_max_storage_id = sccb->max_id;
551 }
552 if (rc || list_empty(&sclp_mem_list))
553 goto out;
554 for (i = 1; i <= sclp.rnmax - assigned; i++)
555 insert_increment(0, 1, 0);
556 rc = register_memory_notifier(&sclp_mem_nb);
557 if (rc)
558 goto out;
559 rc = platform_driver_register(&sclp_mem_pdrv);
560 if (rc)
561 goto out;
562 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
563 rc = PTR_ERR_OR_ZERO(sclp_pdev);
564 if (rc)
565 goto out_driver;
566 sclp_add_standby_memory();
567 goto out;
568out_driver:
569 platform_driver_unregister(&sclp_mem_pdrv);
570out:
571 free_page((unsigned long) sccb);
572 return rc;
573}
574__initcall(sclp_detect_standby_memory);
575
576#endif /* CONFIG_MEMORY_HOTPLUG */
577
578/*
579 * PCI I/O adapter configuration related functions.
580 */
581#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
582#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
583
584#define SCLP_RECONFIG_PCI_ATPYE 2
585
586struct pci_cfg_sccb {
587 struct sccb_header header;
588 u8 atype; /* adapter type */
589 u8 reserved1;
590 u16 reserved2;
591 u32 aid; /* adapter identifier */
592} __packed;
593
594static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
595{
596 struct pci_cfg_sccb *sccb;
597 int rc;
598
599 if (!SCLP_HAS_PCI_RECONFIG)
600 return -EOPNOTSUPP;
601
602 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
603 if (!sccb)
604 return -ENOMEM;
605
606 sccb->header.length = PAGE_SIZE;
607 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
608 sccb->aid = fid;
609 rc = sclp_sync_request(cmd, sccb);
610 if (rc)
611 goto out;
612 switch (sccb->header.response_code) {
613 case 0x0020:
614 case 0x0120:
615 break;
616 default:
617 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
618 cmd, sccb->header.response_code);
619 rc = -EIO;
620 break;
621 }
622out:
623 free_page((unsigned long) sccb);
624 return rc;
625}
626
627int sclp_pci_configure(u32 fid)
628{
629 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
630}
631EXPORT_SYMBOL(sclp_pci_configure);
632
633int sclp_pci_deconfigure(u32 fid)
634{
635 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
636}
637EXPORT_SYMBOL(sclp_pci_deconfigure);
638
639/*
640 * Channel path configuration related functions.
641 */
642
643#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
644#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
645#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
646
647struct chp_cfg_sccb {
648 struct sccb_header header;
649 u8 ccm;
650 u8 reserved[6];
651 u8 cssid;
652} __attribute__((packed));
653
654static int do_chp_configure(sclp_cmdw_t cmd)
655{
656 struct chp_cfg_sccb *sccb;
657 int rc;
658
659 if (!SCLP_HAS_CHP_RECONFIG)
660 return -EOPNOTSUPP;
661 /* Prepare sccb. */
662 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
663 if (!sccb)
664 return -ENOMEM;
665 sccb->header.length = sizeof(*sccb);
666 rc = sclp_sync_request(cmd, sccb);
667 if (rc)
668 goto out;
669 switch (sccb->header.response_code) {
670 case 0x0020:
671 case 0x0120:
672 case 0x0440:
673 case 0x0450:
674 break;
675 default:
676 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
677 cmd, sccb->header.response_code);
678 rc = -EIO;
679 break;
680 }
681out:
682 free_page((unsigned long) sccb);
683 return rc;
684}
685
686/**
687 * sclp_chp_configure - perform configure channel-path sclp command
688 * @chpid: channel-path ID
689 *
690 * Perform configure channel-path command sclp command for specified chpid.
691 * Return 0 after command successfully finished, non-zero otherwise.
692 */
693int sclp_chp_configure(struct chp_id chpid)
694{
695 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
696}
697
698/**
699 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
700 * @chpid: channel-path ID
701 *
702 * Perform deconfigure channel-path command sclp command for specified chpid
703 * and wait for completion. On success return 0. Return non-zero otherwise.
704 */
705int sclp_chp_deconfigure(struct chp_id chpid)
706{
707 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
708}
709
710struct chp_info_sccb {
711 struct sccb_header header;
712 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
713 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
714 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
715 u8 ccm;
716 u8 reserved[6];
717 u8 cssid;
718} __attribute__((packed));
719
720/**
721 * sclp_chp_read_info - perform read channel-path information sclp command
722 * @info: resulting channel-path information data
723 *
724 * Perform read channel-path information sclp command and wait for completion.
725 * On success, store channel-path information in @info and return 0. Return
726 * non-zero otherwise.
727 */
728int sclp_chp_read_info(struct sclp_chp_info *info)
729{
730 struct chp_info_sccb *sccb;
731 int rc;
732
733 if (!SCLP_HAS_CHP_INFO)
734 return -EOPNOTSUPP;
735 /* Prepare sccb. */
736 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
737 if (!sccb)
738 return -ENOMEM;
739 sccb->header.length = sizeof(*sccb);
740 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
741 if (rc)
742 goto out;
743 if (sccb->header.response_code != 0x0010) {
744 pr_warn("read channel-path info failed (response=0x%04x)\n",
745 sccb->header.response_code);
746 rc = -EIO;
747 goto out;
748 }
749 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
750 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
751 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
752out:
753 free_page((unsigned long) sccb);
754 return rc;
755}