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
sclp_sync_callback(struct sclp_req * req,void * data)33 static void sclp_sync_callback(struct sclp_req *req, void *data)
34 {
35 struct completion *completion = data;
36
37 complete(completion);
38 }
39
sclp_sync_request(sclp_cmdw_t cmd,void * sccb)40 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
41 {
42 return sclp_sync_request_timeout(cmd, sccb, 0);
43 }
44
sclp_sync_request_timeout(sclp_cmdw_t cmd,void * sccb,int timeout)45 int 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 }
75 out:
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
_sclp_get_core_info(struct sclp_core_info * info)87 int _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);
109 out:
110 free_page((unsigned long) sccb);
111 return rc;
112 }
113
114 struct cpu_configure_sccb {
115 struct sccb_header header;
116 } __attribute__((packed, aligned(8)));
117
do_core_configure(sclp_cmdw_t cmd)118 static 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 }
146 out:
147 kfree(sccb);
148 return rc;
149 }
150
sclp_core_configure(u8 core)151 int sclp_core_configure(u8 core)
152 {
153 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
154 }
155
sclp_core_deconfigure(u8 core)156 int 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
163 static DEFINE_MUTEX(sclp_mem_mutex);
164 static LIST_HEAD(sclp_mem_list);
165 static u8 sclp_max_storage_id;
166 static DECLARE_BITMAP(sclp_storage_ids, 256);
167 static int sclp_mem_state_changed;
168
169 struct memory_increment {
170 struct list_head list;
171 u16 rn;
172 int standby;
173 };
174
175 struct assign_storage_sccb {
176 struct sccb_header header;
177 u16 rn;
178 } __packed;
179
arch_get_memory_phys_device(unsigned long start_pfn)180 int 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
rn2addr(u16 rn)187 static unsigned long long rn2addr(u16 rn)
188 {
189 return (unsigned long long) (rn - 1) * sclp.rzm;
190 }
191
do_assign_storage(sclp_cmdw_t cmd,u16 rn)192 static 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 }
215 out:
216 free_page((unsigned long) sccb);
217 return rc;
218 }
219
sclp_assign_storage(u16 rn)220 static 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
sclp_unassign_storage(u16 rn)233 static int sclp_unassign_storage(u16 rn)
234 {
235 return do_assign_storage(0x000c0001, rn);
236 }
237
238 struct attach_storage_sccb {
239 struct sccb_header header;
240 u16 :16;
241 u16 assigned;
242 u32 :32;
243 u32 entries[0];
244 } __packed;
245
sclp_attach_storage(u8 id)246 static 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 }
273 out:
274 free_page((unsigned long) sccb);
275 return rc;
276 }
277
sclp_mem_change_state(unsigned long start,unsigned long size,int online)278 static 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
contains_standby_increment(unsigned long start,unsigned long end)301 static 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
sclp_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)318 static 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
364 static struct notifier_block sclp_mem_nb = {
365 .notifier_call = sclp_mem_notifier,
366 };
367
align_to_block_size(unsigned long long * start,unsigned long long * size,unsigned long long alignment)368 static 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
add_memory_merged(u16 rn)383 static 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);
410 skip_add:
411 first_rn = rn;
412 num = 1;
413 }
414
sclp_add_standby_memory(void)415 static 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
insert_increment(u16 rn,int standby,int assigned)425 static 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
sclp_mem_freeze(struct device * dev)455 static 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
463 struct read_storage_sccb {
464 struct sccb_header header;
465 u16 max_id;
466 u16 assigned;
467 u16 standby;
468 u16 :16;
469 u32 entries[0];
470 } __packed;
471
472 static const struct dev_pm_ops sclp_mem_pm_ops = {
473 .freeze = sclp_mem_freeze,
474 };
475
476 static struct platform_driver sclp_mem_pdrv = {
477 .driver = {
478 .name = "sclp_mem",
479 .pm = &sclp_mem_pm_ops,
480 },
481 };
482
sclp_detect_standby_memory(void)483 static int __init sclp_detect_standby_memory(void)
484 {
485 struct platform_device *sclp_pdev;
486 struct read_storage_sccb *sccb;
487 int i, id, assigned, rc;
488
489 if (OLDMEM_BASE) /* No standby memory in kdump mode */
490 return 0;
491 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
492 return 0;
493 rc = -ENOMEM;
494 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
495 if (!sccb)
496 goto out;
497 assigned = 0;
498 for (id = 0; id <= sclp_max_storage_id; id++) {
499 memset(sccb, 0, PAGE_SIZE);
500 sccb->header.length = PAGE_SIZE;
501 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
502 if (rc)
503 goto out;
504 switch (sccb->header.response_code) {
505 case 0x0010:
506 set_bit(id, sclp_storage_ids);
507 for (i = 0; i < sccb->assigned; i++) {
508 if (!sccb->entries[i])
509 continue;
510 assigned++;
511 insert_increment(sccb->entries[i] >> 16, 0, 1);
512 }
513 break;
514 case 0x0310:
515 break;
516 case 0x0410:
517 for (i = 0; i < sccb->assigned; i++) {
518 if (!sccb->entries[i])
519 continue;
520 assigned++;
521 insert_increment(sccb->entries[i] >> 16, 1, 1);
522 }
523 break;
524 default:
525 rc = -EIO;
526 break;
527 }
528 if (!rc)
529 sclp_max_storage_id = sccb->max_id;
530 }
531 if (rc || list_empty(&sclp_mem_list))
532 goto out;
533 for (i = 1; i <= sclp.rnmax - assigned; i++)
534 insert_increment(0, 1, 0);
535 rc = register_memory_notifier(&sclp_mem_nb);
536 if (rc)
537 goto out;
538 rc = platform_driver_register(&sclp_mem_pdrv);
539 if (rc)
540 goto out;
541 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
542 rc = PTR_ERR_OR_ZERO(sclp_pdev);
543 if (rc)
544 goto out_driver;
545 sclp_add_standby_memory();
546 goto out;
547 out_driver:
548 platform_driver_unregister(&sclp_mem_pdrv);
549 out:
550 free_page((unsigned long) sccb);
551 return rc;
552 }
553 __initcall(sclp_detect_standby_memory);
554
555 #endif /* CONFIG_MEMORY_HOTPLUG */
556
557 /*
558 * Channel path configuration related functions.
559 */
560
561 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
562 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
563 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
564
565 struct chp_cfg_sccb {
566 struct sccb_header header;
567 u8 ccm;
568 u8 reserved[6];
569 u8 cssid;
570 } __attribute__((packed));
571
do_chp_configure(sclp_cmdw_t cmd)572 static int do_chp_configure(sclp_cmdw_t cmd)
573 {
574 struct chp_cfg_sccb *sccb;
575 int rc;
576
577 if (!SCLP_HAS_CHP_RECONFIG)
578 return -EOPNOTSUPP;
579 /* Prepare sccb. */
580 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
581 if (!sccb)
582 return -ENOMEM;
583 sccb->header.length = sizeof(*sccb);
584 rc = sclp_sync_request(cmd, sccb);
585 if (rc)
586 goto out;
587 switch (sccb->header.response_code) {
588 case 0x0020:
589 case 0x0120:
590 case 0x0440:
591 case 0x0450:
592 break;
593 default:
594 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
595 cmd, sccb->header.response_code);
596 rc = -EIO;
597 break;
598 }
599 out:
600 free_page((unsigned long) sccb);
601 return rc;
602 }
603
604 /**
605 * sclp_chp_configure - perform configure channel-path sclp command
606 * @chpid: channel-path ID
607 *
608 * Perform configure channel-path command sclp command for specified chpid.
609 * Return 0 after command successfully finished, non-zero otherwise.
610 */
sclp_chp_configure(struct chp_id chpid)611 int sclp_chp_configure(struct chp_id chpid)
612 {
613 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
614 }
615
616 /**
617 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
618 * @chpid: channel-path ID
619 *
620 * Perform deconfigure channel-path command sclp command for specified chpid
621 * and wait for completion. On success return 0. Return non-zero otherwise.
622 */
sclp_chp_deconfigure(struct chp_id chpid)623 int sclp_chp_deconfigure(struct chp_id chpid)
624 {
625 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
626 }
627
628 struct chp_info_sccb {
629 struct sccb_header header;
630 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
631 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
632 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
633 u8 ccm;
634 u8 reserved[6];
635 u8 cssid;
636 } __attribute__((packed));
637
638 /**
639 * sclp_chp_read_info - perform read channel-path information sclp command
640 * @info: resulting channel-path information data
641 *
642 * Perform read channel-path information sclp command and wait for completion.
643 * On success, store channel-path information in @info and return 0. Return
644 * non-zero otherwise.
645 */
sclp_chp_read_info(struct sclp_chp_info * info)646 int sclp_chp_read_info(struct sclp_chp_info *info)
647 {
648 struct chp_info_sccb *sccb;
649 int rc;
650
651 if (!SCLP_HAS_CHP_INFO)
652 return -EOPNOTSUPP;
653 /* Prepare sccb. */
654 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
655 if (!sccb)
656 return -ENOMEM;
657 sccb->header.length = sizeof(*sccb);
658 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
659 if (rc)
660 goto out;
661 if (sccb->header.response_code != 0x0010) {
662 pr_warn("read channel-path info failed (response=0x%04x)\n",
663 sccb->header.response_code);
664 rc = -EIO;
665 goto out;
666 }
667 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
668 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
669 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
670 out:
671 free_page((unsigned long) sccb);
672 return rc;
673 }
674