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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007,2012
4 *
5 * Author(s): 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/memory_hotplug.h>
22#include <linux/module.h>
23#include <asm/ctlreg.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#include <asm/facility.h>
30#include <asm/page-states.h>
31
32#include "sclp.h"
33
34static void sclp_sync_callback(struct sclp_req *req, void *data)
35{
36 struct completion *completion = data;
37
38 complete(completion);
39}
40
41int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
42{
43 return sclp_sync_request_timeout(cmd, sccb, 0);
44}
45
46int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
47{
48 struct completion completion;
49 struct sclp_req *request;
50 int rc;
51
52 request = kzalloc(sizeof(*request), GFP_KERNEL);
53 if (!request)
54 return -ENOMEM;
55 if (timeout)
56 request->queue_timeout = timeout;
57 request->command = cmd;
58 request->sccb = sccb;
59 request->status = SCLP_REQ_FILLED;
60 request->callback = sclp_sync_callback;
61 request->callback_data = &completion;
62 init_completion(&completion);
63
64 /* Perform sclp request. */
65 rc = sclp_add_request(request);
66 if (rc)
67 goto out;
68 wait_for_completion(&completion);
69
70 /* Check response. */
71 if (request->status != SCLP_REQ_DONE) {
72 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
73 cmd, request->status);
74 rc = -EIO;
75 }
76out:
77 kfree(request);
78 return rc;
79}
80
81/*
82 * CPU configuration related functions.
83 */
84
85#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
86#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
87
88int _sclp_get_core_info(struct sclp_core_info *info)
89{
90 int rc;
91 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
92 struct read_cpu_info_sccb *sccb;
93
94 if (!SCLP_HAS_CPU_INFO)
95 return -EOPNOTSUPP;
96
97 sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
98 if (!sccb)
99 return -ENOMEM;
100 sccb->header.length = length;
101 sccb->header.control_mask[2] = 0x80;
102 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
103 SCLP_QUEUE_INTERVAL);
104 if (rc)
105 goto out;
106 if (sccb->header.response_code != 0x0010) {
107 pr_warn("readcpuinfo failed (response=0x%04x)\n",
108 sccb->header.response_code);
109 rc = -EIO;
110 goto out;
111 }
112 sclp_fill_core_info(info, sccb);
113out:
114 free_pages((unsigned long) sccb, get_order(length));
115 return rc;
116}
117
118struct cpu_configure_sccb {
119 struct sccb_header header;
120} __attribute__((packed, aligned(8)));
121
122static int do_core_configure(sclp_cmdw_t cmd)
123{
124 struct cpu_configure_sccb *sccb;
125 int rc;
126
127 if (!SCLP_HAS_CPU_RECONFIG)
128 return -EOPNOTSUPP;
129 /*
130 * This is not going to cross a page boundary since we force
131 * kmalloc to have a minimum alignment of 8 bytes on s390.
132 */
133 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
134 if (!sccb)
135 return -ENOMEM;
136 sccb->header.length = sizeof(*sccb);
137 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
138 if (rc)
139 goto out;
140 switch (sccb->header.response_code) {
141 case 0x0020:
142 case 0x0120:
143 break;
144 default:
145 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
146 cmd, sccb->header.response_code);
147 rc = -EIO;
148 break;
149 }
150out:
151 kfree(sccb);
152 return rc;
153}
154
155int sclp_core_configure(u8 core)
156{
157 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
158}
159
160int sclp_core_deconfigure(u8 core)
161{
162 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
163}
164
165#ifdef CONFIG_MEMORY_HOTPLUG
166
167static DEFINE_MUTEX(sclp_mem_mutex);
168static LIST_HEAD(sclp_mem_list);
169static u8 sclp_max_storage_id;
170static DECLARE_BITMAP(sclp_storage_ids, 256);
171
172struct memory_increment {
173 struct list_head list;
174 u16 rn;
175 int standby;
176};
177
178struct assign_storage_sccb {
179 struct sccb_header header;
180 u16 rn;
181} __packed;
182
183int arch_get_memory_phys_device(unsigned long start_pfn)
184{
185 if (!sclp.rzm)
186 return 0;
187 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
188}
189
190static unsigned long long rn2addr(u16 rn)
191{
192 return (unsigned long long) (rn - 1) * sclp.rzm;
193}
194
195static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
196{
197 struct assign_storage_sccb *sccb;
198 int rc;
199
200 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
201 if (!sccb)
202 return -ENOMEM;
203 sccb->header.length = PAGE_SIZE;
204 sccb->rn = rn;
205 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
206 if (rc)
207 goto out;
208 switch (sccb->header.response_code) {
209 case 0x0020:
210 case 0x0120:
211 break;
212 default:
213 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
214 cmd, sccb->header.response_code, rn);
215 rc = -EIO;
216 break;
217 }
218out:
219 free_page((unsigned long) sccb);
220 return rc;
221}
222
223static int sclp_assign_storage(u16 rn)
224{
225 unsigned long long start;
226 int rc;
227
228 rc = do_assign_storage(0x000d0001, rn);
229 if (rc)
230 return rc;
231 start = rn2addr(rn);
232 storage_key_init_range(start, start + sclp.rzm);
233 return 0;
234}
235
236static int sclp_unassign_storage(u16 rn)
237{
238 return do_assign_storage(0x000c0001, rn);
239}
240
241struct attach_storage_sccb {
242 struct sccb_header header;
243 u16 :16;
244 u16 assigned;
245 u32 :32;
246 u32 entries[];
247} __packed;
248
249static int sclp_attach_storage(u8 id)
250{
251 struct attach_storage_sccb *sccb;
252 int rc;
253 int i;
254
255 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
256 if (!sccb)
257 return -ENOMEM;
258 sccb->header.length = PAGE_SIZE;
259 sccb->header.function_code = 0x40;
260 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
261 SCLP_QUEUE_INTERVAL);
262 if (rc)
263 goto out;
264 switch (sccb->header.response_code) {
265 case 0x0020:
266 set_bit(id, sclp_storage_ids);
267 for (i = 0; i < sccb->assigned; i++) {
268 if (sccb->entries[i])
269 sclp_unassign_storage(sccb->entries[i] >> 16);
270 }
271 break;
272 default:
273 rc = -EIO;
274 break;
275 }
276out:
277 free_page((unsigned long) sccb);
278 return rc;
279}
280
281static int sclp_mem_change_state(unsigned long start, unsigned long size,
282 int online)
283{
284 struct memory_increment *incr;
285 unsigned long long istart;
286 int rc = 0;
287
288 list_for_each_entry(incr, &sclp_mem_list, list) {
289 istart = rn2addr(incr->rn);
290 if (start + size - 1 < istart)
291 break;
292 if (start > istart + sclp.rzm - 1)
293 continue;
294 if (online)
295 rc |= sclp_assign_storage(incr->rn);
296 else
297 sclp_unassign_storage(incr->rn);
298 if (rc == 0)
299 incr->standby = online ? 0 : 1;
300 }
301 return rc ? -EIO : 0;
302}
303
304static bool contains_standby_increment(unsigned long start, unsigned long end)
305{
306 struct memory_increment *incr;
307 unsigned long istart;
308
309 list_for_each_entry(incr, &sclp_mem_list, list) {
310 istart = rn2addr(incr->rn);
311 if (end - 1 < istart)
312 continue;
313 if (start > istart + sclp.rzm - 1)
314 continue;
315 if (incr->standby)
316 return true;
317 }
318 return false;
319}
320
321static int sclp_mem_notifier(struct notifier_block *nb,
322 unsigned long action, void *data)
323{
324 unsigned long start, size;
325 struct memory_notify *arg;
326 unsigned char id;
327 int rc = 0;
328
329 arg = data;
330 start = arg->start_pfn << PAGE_SHIFT;
331 size = arg->nr_pages << PAGE_SHIFT;
332 mutex_lock(&sclp_mem_mutex);
333 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
334 sclp_attach_storage(id);
335 switch (action) {
336 case MEM_GOING_OFFLINE:
337 /*
338 * We do not allow to set memory blocks offline that contain
339 * standby memory. This is done to simplify the "memory online"
340 * case.
341 */
342 if (contains_standby_increment(start, start + size))
343 rc = -EPERM;
344 break;
345 case MEM_PREPARE_ONLINE:
346 /*
347 * Access the altmap_start_pfn and altmap_nr_pages fields
348 * within the struct memory_notify specifically when dealing
349 * with only MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers.
350 *
351 * When altmap is in use, take the specified memory range
352 * online, which includes the altmap.
353 */
354 if (arg->altmap_nr_pages) {
355 start = PFN_PHYS(arg->altmap_start_pfn);
356 size += PFN_PHYS(arg->altmap_nr_pages);
357 }
358 rc = sclp_mem_change_state(start, size, 1);
359 if (rc || !arg->altmap_nr_pages)
360 break;
361 /*
362 * Set CMMA state to nodat here, since the struct page memory
363 * at the beginning of the memory block will not go through the
364 * buddy allocator later.
365 */
366 __arch_set_page_nodat((void *)__va(start), arg->altmap_nr_pages);
367 break;
368 case MEM_FINISH_OFFLINE:
369 /*
370 * When altmap is in use, take the specified memory range
371 * offline, which includes the altmap.
372 */
373 if (arg->altmap_nr_pages) {
374 start = PFN_PHYS(arg->altmap_start_pfn);
375 size += PFN_PHYS(arg->altmap_nr_pages);
376 }
377 sclp_mem_change_state(start, size, 0);
378 break;
379 default:
380 break;
381 }
382 mutex_unlock(&sclp_mem_mutex);
383 return rc ? NOTIFY_BAD : NOTIFY_OK;
384}
385
386static struct notifier_block sclp_mem_nb = {
387 .notifier_call = sclp_mem_notifier,
388};
389
390static void __init align_to_block_size(unsigned long long *start,
391 unsigned long long *size,
392 unsigned long long alignment)
393{
394 unsigned long long start_align, size_align;
395
396 start_align = roundup(*start, alignment);
397 size_align = rounddown(*start + *size, alignment) - start_align;
398
399 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
400 *start, size_align >> 20, *size >> 20);
401 *start = start_align;
402 *size = size_align;
403}
404
405static void __init add_memory_merged(u16 rn)
406{
407 unsigned long long start, size, addr, block_size;
408 static u16 first_rn, num;
409
410 if (rn && first_rn && (first_rn + num == rn)) {
411 num++;
412 return;
413 }
414 if (!first_rn)
415 goto skip_add;
416 start = rn2addr(first_rn);
417 size = (unsigned long long) num * sclp.rzm;
418 if (start >= ident_map_size)
419 goto skip_add;
420 if (start + size > ident_map_size)
421 size = ident_map_size - start;
422 block_size = memory_block_size_bytes();
423 align_to_block_size(&start, &size, block_size);
424 if (!size)
425 goto skip_add;
426 for (addr = start; addr < start + size; addr += block_size)
427 add_memory(0, addr, block_size,
428 MACHINE_HAS_EDAT1 ?
429 MHP_MEMMAP_ON_MEMORY | MHP_OFFLINE_INACCESSIBLE : MHP_NONE);
430skip_add:
431 first_rn = rn;
432 num = 1;
433}
434
435static void __init sclp_add_standby_memory(void)
436{
437 struct memory_increment *incr;
438
439 list_for_each_entry(incr, &sclp_mem_list, list)
440 if (incr->standby)
441 add_memory_merged(incr->rn);
442 add_memory_merged(0);
443}
444
445static void __init insert_increment(u16 rn, int standby, int assigned)
446{
447 struct memory_increment *incr, *new_incr;
448 struct list_head *prev;
449 u16 last_rn;
450
451 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
452 if (!new_incr)
453 return;
454 new_incr->rn = rn;
455 new_incr->standby = standby;
456 last_rn = 0;
457 prev = &sclp_mem_list;
458 list_for_each_entry(incr, &sclp_mem_list, list) {
459 if (assigned && incr->rn > rn)
460 break;
461 if (!assigned && incr->rn - last_rn > 1)
462 break;
463 last_rn = incr->rn;
464 prev = &incr->list;
465 }
466 if (!assigned)
467 new_incr->rn = last_rn + 1;
468 if (new_incr->rn > sclp.rnmax) {
469 kfree(new_incr);
470 return;
471 }
472 list_add(&new_incr->list, prev);
473}
474
475static int __init sclp_detect_standby_memory(void)
476{
477 struct read_storage_sccb *sccb;
478 int i, id, assigned, rc;
479
480 if (oldmem_data.start) /* 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 sclp_add_standby_memory();
530out:
531 free_page((unsigned long) sccb);
532 return rc;
533}
534__initcall(sclp_detect_standby_memory);
535
536#endif /* CONFIG_MEMORY_HOTPLUG */
537
538/*
539 * Channel path configuration related functions.
540 */
541
542#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
543#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
544#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
545
546struct chp_cfg_sccb {
547 struct sccb_header header;
548 u8 ccm;
549 u8 reserved[6];
550 u8 cssid;
551} __attribute__((packed));
552
553static int do_chp_configure(sclp_cmdw_t cmd)
554{
555 struct chp_cfg_sccb *sccb;
556 int rc;
557
558 if (!SCLP_HAS_CHP_RECONFIG)
559 return -EOPNOTSUPP;
560 /* Prepare sccb. */
561 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
562 if (!sccb)
563 return -ENOMEM;
564 sccb->header.length = sizeof(*sccb);
565 rc = sclp_sync_request(cmd, sccb);
566 if (rc)
567 goto out;
568 switch (sccb->header.response_code) {
569 case 0x0020:
570 case 0x0120:
571 case 0x0440:
572 case 0x0450:
573 break;
574 default:
575 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
576 cmd, sccb->header.response_code);
577 rc = -EIO;
578 break;
579 }
580out:
581 free_page((unsigned long) sccb);
582 return rc;
583}
584
585/**
586 * sclp_chp_configure - perform configure channel-path sclp command
587 * @chpid: channel-path ID
588 *
589 * Perform configure channel-path command sclp command for specified chpid.
590 * Return 0 after command successfully finished, non-zero otherwise.
591 */
592int sclp_chp_configure(struct chp_id chpid)
593{
594 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
595}
596
597/**
598 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
599 * @chpid: channel-path ID
600 *
601 * Perform deconfigure channel-path command sclp command for specified chpid
602 * and wait for completion. On success return 0. Return non-zero otherwise.
603 */
604int sclp_chp_deconfigure(struct chp_id chpid)
605{
606 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
607}
608
609struct chp_info_sccb {
610 struct sccb_header header;
611 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
612 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
613 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
614 u8 ccm;
615 u8 reserved[6];
616 u8 cssid;
617} __attribute__((packed));
618
619/**
620 * sclp_chp_read_info - perform read channel-path information sclp command
621 * @info: resulting channel-path information data
622 *
623 * Perform read channel-path information sclp command and wait for completion.
624 * On success, store channel-path information in @info and return 0. Return
625 * non-zero otherwise.
626 */
627int sclp_chp_read_info(struct sclp_chp_info *info)
628{
629 struct chp_info_sccb *sccb;
630 int rc;
631
632 if (!SCLP_HAS_CHP_INFO)
633 return -EOPNOTSUPP;
634 /* Prepare sccb. */
635 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
636 if (!sccb)
637 return -ENOMEM;
638 sccb->header.length = sizeof(*sccb);
639 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
640 if (rc)
641 goto out;
642 if (sccb->header.response_code != 0x0010) {
643 pr_warn("read channel-path info failed (response=0x%04x)\n",
644 sccb->header.response_code);
645 rc = -EIO;
646 goto out;
647 }
648 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
649 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
650 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
651out:
652 free_page((unsigned long) sccb);
653 return rc;
654}