Loading...
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// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007,2012
4 *
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
6 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
7 */
8
9#define KMSG_COMPONENT "sclp_cmd"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/completion.h>
13#include <linux/init.h>
14#include <linux/errno.h>
15#include <linux/err.h>
16#include <linux/export.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/mm.h>
20#include <linux/mmzone.h>
21#include <linux/memory.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <asm/ctl_reg.h>
25#include <asm/chpid.h>
26#include <asm/setup.h>
27#include <asm/page.h>
28#include <asm/sclp.h>
29#include <asm/numa.h>
30
31#include "sclp.h"
32
33static void sclp_sync_callback(struct sclp_req *req, void *data)
34{
35 struct completion *completion = data;
36
37 complete(completion);
38}
39
40int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
41{
42 return sclp_sync_request_timeout(cmd, sccb, 0);
43}
44
45int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
46{
47 struct completion completion;
48 struct sclp_req *request;
49 int rc;
50
51 request = kzalloc(sizeof(*request), GFP_KERNEL);
52 if (!request)
53 return -ENOMEM;
54 if (timeout)
55 request->queue_timeout = timeout;
56 request->command = cmd;
57 request->sccb = sccb;
58 request->status = SCLP_REQ_FILLED;
59 request->callback = sclp_sync_callback;
60 request->callback_data = &completion;
61 init_completion(&completion);
62
63 /* Perform sclp request. */
64 rc = sclp_add_request(request);
65 if (rc)
66 goto out;
67 wait_for_completion(&completion);
68
69 /* Check response. */
70 if (request->status != SCLP_REQ_DONE) {
71 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
72 cmd, request->status);
73 rc = -EIO;
74 }
75out:
76 kfree(request);
77 return rc;
78}
79
80/*
81 * CPU configuration related functions.
82 */
83
84#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
85#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
86
87int _sclp_get_core_info(struct sclp_core_info *info)
88{
89 int rc;
90 struct read_cpu_info_sccb *sccb;
91
92 if (!SCLP_HAS_CPU_INFO)
93 return -EOPNOTSUPP;
94 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
95 if (!sccb)
96 return -ENOMEM;
97 sccb->header.length = sizeof(*sccb);
98 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
99 SCLP_QUEUE_INTERVAL);
100 if (rc)
101 goto out;
102 if (sccb->header.response_code != 0x0010) {
103 pr_warn("readcpuinfo failed (response=0x%04x)\n",
104 sccb->header.response_code);
105 rc = -EIO;
106 goto out;
107 }
108 sclp_fill_core_info(info, sccb);
109out:
110 free_page((unsigned long) sccb);
111 return rc;
112}
113
114struct cpu_configure_sccb {
115 struct sccb_header header;
116} __attribute__((packed, aligned(8)));
117
118static int do_core_configure(sclp_cmdw_t cmd)
119{
120 struct cpu_configure_sccb *sccb;
121 int rc;
122
123 if (!SCLP_HAS_CPU_RECONFIG)
124 return -EOPNOTSUPP;
125 /*
126 * This is not going to cross a page boundary since we force
127 * kmalloc to have a minimum alignment of 8 bytes on s390.
128 */
129 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
130 if (!sccb)
131 return -ENOMEM;
132 sccb->header.length = sizeof(*sccb);
133 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
134 if (rc)
135 goto out;
136 switch (sccb->header.response_code) {
137 case 0x0020:
138 case 0x0120:
139 break;
140 default:
141 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
142 cmd, sccb->header.response_code);
143 rc = -EIO;
144 break;
145 }
146out:
147 kfree(sccb);
148 return rc;
149}
150
151int sclp_core_configure(u8 core)
152{
153 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
154}
155
156int sclp_core_deconfigure(u8 core)
157{
158 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
159}
160
161#ifdef CONFIG_MEMORY_HOTPLUG
162
163static DEFINE_MUTEX(sclp_mem_mutex);
164static LIST_HEAD(sclp_mem_list);
165static u8 sclp_max_storage_id;
166static DECLARE_BITMAP(sclp_storage_ids, 256);
167static int sclp_mem_state_changed;
168
169struct memory_increment {
170 struct list_head list;
171 u16 rn;
172 int standby;
173};
174
175struct assign_storage_sccb {
176 struct sccb_header header;
177 u16 rn;
178} __packed;
179
180int arch_get_memory_phys_device(unsigned long start_pfn)
181{
182 if (!sclp.rzm)
183 return 0;
184 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
185}
186
187static unsigned long long rn2addr(u16 rn)
188{
189 return (unsigned long long) (rn - 1) * sclp.rzm;
190}
191
192static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
193{
194 struct assign_storage_sccb *sccb;
195 int rc;
196
197 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
198 if (!sccb)
199 return -ENOMEM;
200 sccb->header.length = PAGE_SIZE;
201 sccb->rn = rn;
202 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
203 if (rc)
204 goto out;
205 switch (sccb->header.response_code) {
206 case 0x0020:
207 case 0x0120:
208 break;
209 default:
210 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
211 cmd, sccb->header.response_code, rn);
212 rc = -EIO;
213 break;
214 }
215out:
216 free_page((unsigned long) sccb);
217 return rc;
218}
219
220static int sclp_assign_storage(u16 rn)
221{
222 unsigned long long start;
223 int rc;
224
225 rc = do_assign_storage(0x000d0001, rn);
226 if (rc)
227 return rc;
228 start = rn2addr(rn);
229 storage_key_init_range(start, start + sclp.rzm);
230 return 0;
231}
232
233static int sclp_unassign_storage(u16 rn)
234{
235 return do_assign_storage(0x000c0001, rn);
236}
237
238struct attach_storage_sccb {
239 struct sccb_header header;
240 u16 :16;
241 u16 assigned;
242 u32 :32;
243 u32 entries[0];
244} __packed;
245
246static int sclp_attach_storage(u8 id)
247{
248 struct attach_storage_sccb *sccb;
249 int rc;
250 int i;
251
252 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
253 if (!sccb)
254 return -ENOMEM;
255 sccb->header.length = PAGE_SIZE;
256 sccb->header.function_code = 0x40;
257 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
258 SCLP_QUEUE_INTERVAL);
259 if (rc)
260 goto out;
261 switch (sccb->header.response_code) {
262 case 0x0020:
263 set_bit(id, sclp_storage_ids);
264 for (i = 0; i < sccb->assigned; i++) {
265 if (sccb->entries[i])
266 sclp_unassign_storage(sccb->entries[i] >> 16);
267 }
268 break;
269 default:
270 rc = -EIO;
271 break;
272 }
273out:
274 free_page((unsigned long) sccb);
275 return rc;
276}
277
278static int sclp_mem_change_state(unsigned long start, unsigned long size,
279 int online)
280{
281 struct memory_increment *incr;
282 unsigned long long istart;
283 int rc = 0;
284
285 list_for_each_entry(incr, &sclp_mem_list, list) {
286 istart = rn2addr(incr->rn);
287 if (start + size - 1 < istart)
288 break;
289 if (start > istart + sclp.rzm - 1)
290 continue;
291 if (online)
292 rc |= sclp_assign_storage(incr->rn);
293 else
294 sclp_unassign_storage(incr->rn);
295 if (rc == 0)
296 incr->standby = online ? 0 : 1;
297 }
298 return rc ? -EIO : 0;
299}
300
301static bool contains_standby_increment(unsigned long start, unsigned long end)
302{
303 struct memory_increment *incr;
304 unsigned long istart;
305
306 list_for_each_entry(incr, &sclp_mem_list, list) {
307 istart = rn2addr(incr->rn);
308 if (end - 1 < istart)
309 continue;
310 if (start > istart + sclp.rzm - 1)
311 continue;
312 if (incr->standby)
313 return true;
314 }
315 return false;
316}
317
318static int sclp_mem_notifier(struct notifier_block *nb,
319 unsigned long action, void *data)
320{
321 unsigned long start, size;
322 struct memory_notify *arg;
323 unsigned char id;
324 int rc = 0;
325
326 arg = data;
327 start = arg->start_pfn << PAGE_SHIFT;
328 size = arg->nr_pages << PAGE_SHIFT;
329 mutex_lock(&sclp_mem_mutex);
330 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
331 sclp_attach_storage(id);
332 switch (action) {
333 case MEM_GOING_OFFLINE:
334 /*
335 * We do not allow to set memory blocks offline that contain
336 * standby memory. This is done to simplify the "memory online"
337 * case.
338 */
339 if (contains_standby_increment(start, start + size))
340 rc = -EPERM;
341 break;
342 case MEM_ONLINE:
343 case MEM_CANCEL_OFFLINE:
344 break;
345 case MEM_GOING_ONLINE:
346 rc = sclp_mem_change_state(start, size, 1);
347 break;
348 case MEM_CANCEL_ONLINE:
349 sclp_mem_change_state(start, size, 0);
350 break;
351 case MEM_OFFLINE:
352 sclp_mem_change_state(start, size, 0);
353 break;
354 default:
355 rc = -EINVAL;
356 break;
357 }
358 if (!rc)
359 sclp_mem_state_changed = 1;
360 mutex_unlock(&sclp_mem_mutex);
361 return rc ? NOTIFY_BAD : NOTIFY_OK;
362}
363
364static struct notifier_block sclp_mem_nb = {
365 .notifier_call = sclp_mem_notifier,
366};
367
368static void __init align_to_block_size(unsigned long long *start,
369 unsigned long long *size,
370 unsigned long long alignment)
371{
372 unsigned long long start_align, size_align;
373
374 start_align = roundup(*start, alignment);
375 size_align = rounddown(*start + *size, alignment) - start_align;
376
377 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
378 *start, size_align >> 20, *size >> 20);
379 *start = start_align;
380 *size = size_align;
381}
382
383static void __init add_memory_merged(u16 rn)
384{
385 unsigned long long start, size, addr, block_size;
386 static u16 first_rn, num;
387
388 if (rn && first_rn && (first_rn + num == rn)) {
389 num++;
390 return;
391 }
392 if (!first_rn)
393 goto skip_add;
394 start = rn2addr(first_rn);
395 size = (unsigned long long) num * sclp.rzm;
396 if (start >= VMEM_MAX_PHYS)
397 goto skip_add;
398 if (start + size > VMEM_MAX_PHYS)
399 size = VMEM_MAX_PHYS - start;
400 if (memory_end_set && (start >= memory_end))
401 goto skip_add;
402 if (memory_end_set && (start + size > memory_end))
403 size = memory_end - start;
404 block_size = memory_block_size_bytes();
405 align_to_block_size(&start, &size, block_size);
406 if (!size)
407 goto skip_add;
408 for (addr = start; addr < start + size; addr += block_size)
409 add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
410skip_add:
411 first_rn = rn;
412 num = 1;
413}
414
415static void __init sclp_add_standby_memory(void)
416{
417 struct memory_increment *incr;
418
419 list_for_each_entry(incr, &sclp_mem_list, list)
420 if (incr->standby)
421 add_memory_merged(incr->rn);
422 add_memory_merged(0);
423}
424
425static void __init insert_increment(u16 rn, int standby, int assigned)
426{
427 struct memory_increment *incr, *new_incr;
428 struct list_head *prev;
429 u16 last_rn;
430
431 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
432 if (!new_incr)
433 return;
434 new_incr->rn = rn;
435 new_incr->standby = standby;
436 last_rn = 0;
437 prev = &sclp_mem_list;
438 list_for_each_entry(incr, &sclp_mem_list, list) {
439 if (assigned && incr->rn > rn)
440 break;
441 if (!assigned && incr->rn - last_rn > 1)
442 break;
443 last_rn = incr->rn;
444 prev = &incr->list;
445 }
446 if (!assigned)
447 new_incr->rn = last_rn + 1;
448 if (new_incr->rn > sclp.rnmax) {
449 kfree(new_incr);
450 return;
451 }
452 list_add(&new_incr->list, prev);
453}
454
455static int sclp_mem_freeze(struct device *dev)
456{
457 if (!sclp_mem_state_changed)
458 return 0;
459 pr_err("Memory hotplug state changed, suspend refused.\n");
460 return -EPERM;
461}
462
463static const struct dev_pm_ops sclp_mem_pm_ops = {
464 .freeze = sclp_mem_freeze,
465};
466
467static struct platform_driver sclp_mem_pdrv = {
468 .driver = {
469 .name = "sclp_mem",
470 .pm = &sclp_mem_pm_ops,
471 },
472};
473
474static int __init sclp_detect_standby_memory(void)
475{
476 struct platform_device *sclp_pdev;
477 struct read_storage_sccb *sccb;
478 int i, id, assigned, rc;
479
480 if (OLDMEM_BASE) /* No standby memory in kdump mode */
481 return 0;
482 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
483 return 0;
484 rc = -ENOMEM;
485 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
486 if (!sccb)
487 goto out;
488 assigned = 0;
489 for (id = 0; id <= sclp_max_storage_id; id++) {
490 memset(sccb, 0, PAGE_SIZE);
491 sccb->header.length = PAGE_SIZE;
492 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
493 if (rc)
494 goto out;
495 switch (sccb->header.response_code) {
496 case 0x0010:
497 set_bit(id, sclp_storage_ids);
498 for (i = 0; i < sccb->assigned; i++) {
499 if (!sccb->entries[i])
500 continue;
501 assigned++;
502 insert_increment(sccb->entries[i] >> 16, 0, 1);
503 }
504 break;
505 case 0x0310:
506 break;
507 case 0x0410:
508 for (i = 0; i < sccb->assigned; i++) {
509 if (!sccb->entries[i])
510 continue;
511 assigned++;
512 insert_increment(sccb->entries[i] >> 16, 1, 1);
513 }
514 break;
515 default:
516 rc = -EIO;
517 break;
518 }
519 if (!rc)
520 sclp_max_storage_id = sccb->max_id;
521 }
522 if (rc || list_empty(&sclp_mem_list))
523 goto out;
524 for (i = 1; i <= sclp.rnmax - assigned; i++)
525 insert_increment(0, 1, 0);
526 rc = register_memory_notifier(&sclp_mem_nb);
527 if (rc)
528 goto out;
529 rc = platform_driver_register(&sclp_mem_pdrv);
530 if (rc)
531 goto out;
532 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
533 rc = PTR_ERR_OR_ZERO(sclp_pdev);
534 if (rc)
535 goto out_driver;
536 sclp_add_standby_memory();
537 goto out;
538out_driver:
539 platform_driver_unregister(&sclp_mem_pdrv);
540out:
541 free_page((unsigned long) sccb);
542 return rc;
543}
544__initcall(sclp_detect_standby_memory);
545
546#endif /* CONFIG_MEMORY_HOTPLUG */
547
548/*
549 * Channel path configuration related functions.
550 */
551
552#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
553#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
554#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
555
556struct chp_cfg_sccb {
557 struct sccb_header header;
558 u8 ccm;
559 u8 reserved[6];
560 u8 cssid;
561} __attribute__((packed));
562
563static int do_chp_configure(sclp_cmdw_t cmd)
564{
565 struct chp_cfg_sccb *sccb;
566 int rc;
567
568 if (!SCLP_HAS_CHP_RECONFIG)
569 return -EOPNOTSUPP;
570 /* Prepare sccb. */
571 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
572 if (!sccb)
573 return -ENOMEM;
574 sccb->header.length = sizeof(*sccb);
575 rc = sclp_sync_request(cmd, sccb);
576 if (rc)
577 goto out;
578 switch (sccb->header.response_code) {
579 case 0x0020:
580 case 0x0120:
581 case 0x0440:
582 case 0x0450:
583 break;
584 default:
585 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
586 cmd, sccb->header.response_code);
587 rc = -EIO;
588 break;
589 }
590out:
591 free_page((unsigned long) sccb);
592 return rc;
593}
594
595/**
596 * sclp_chp_configure - perform configure channel-path sclp command
597 * @chpid: channel-path ID
598 *
599 * Perform configure channel-path command sclp command for specified chpid.
600 * Return 0 after command successfully finished, non-zero otherwise.
601 */
602int sclp_chp_configure(struct chp_id chpid)
603{
604 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
605}
606
607/**
608 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
609 * @chpid: channel-path ID
610 *
611 * Perform deconfigure channel-path command sclp command for specified chpid
612 * and wait for completion. On success return 0. Return non-zero otherwise.
613 */
614int sclp_chp_deconfigure(struct chp_id chpid)
615{
616 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
617}
618
619struct chp_info_sccb {
620 struct sccb_header header;
621 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
622 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
623 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
624 u8 ccm;
625 u8 reserved[6];
626 u8 cssid;
627} __attribute__((packed));
628
629/**
630 * sclp_chp_read_info - perform read channel-path information sclp command
631 * @info: resulting channel-path information data
632 *
633 * Perform read channel-path information sclp command and wait for completion.
634 * On success, store channel-path information in @info and return 0. Return
635 * non-zero otherwise.
636 */
637int sclp_chp_read_info(struct sclp_chp_info *info)
638{
639 struct chp_info_sccb *sccb;
640 int rc;
641
642 if (!SCLP_HAS_CHP_INFO)
643 return -EOPNOTSUPP;
644 /* Prepare sccb. */
645 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
646 if (!sccb)
647 return -ENOMEM;
648 sccb->header.length = sizeof(*sccb);
649 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
650 if (rc)
651 goto out;
652 if (sccb->header.response_code != 0x0010) {
653 pr_warn("read channel-path info failed (response=0x%04x)\n",
654 sccb->header.response_code);
655 rc = -EIO;
656 goto out;
657 }
658 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
659 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
660 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
661out:
662 free_page((unsigned long) sccb);
663 return rc;
664}