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/module.h>
22 #include <asm/ctl_reg.h>
23 #include <asm/chpid.h>
24 #include <asm/setup.h>
25 #include <asm/page.h>
26 #include <asm/sclp.h>
27 #include <asm/numa.h>
28 #include <asm/facility.h>
29
30 #include "sclp.h"
31
sclp_sync_callback(struct sclp_req * req,void * data)32 static void sclp_sync_callback(struct sclp_req *req, void *data)
33 {
34 struct completion *completion = data;
35
36 complete(completion);
37 }
38
sclp_sync_request(sclp_cmdw_t cmd,void * sccb)39 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
40 {
41 return sclp_sync_request_timeout(cmd, sccb, 0);
42 }
43
sclp_sync_request_timeout(sclp_cmdw_t cmd,void * sccb,int timeout)44 int 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 }
74 out:
75 kfree(request);
76 return rc;
77 }
78
79 /*
80 * CPU configuration related functions.
81 */
82
83 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
84 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
85
_sclp_get_core_info(struct sclp_core_info * info)86 int _sclp_get_core_info(struct sclp_core_info *info)
87 {
88 int rc;
89 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
90 struct read_cpu_info_sccb *sccb;
91
92 if (!SCLP_HAS_CPU_INFO)
93 return -EOPNOTSUPP;
94
95 sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
96 if (!sccb)
97 return -ENOMEM;
98 sccb->header.length = length;
99 sccb->header.control_mask[2] = 0x80;
100 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
101 SCLP_QUEUE_INTERVAL);
102 if (rc)
103 goto out;
104 if (sccb->header.response_code != 0x0010) {
105 pr_warn("readcpuinfo failed (response=0x%04x)\n",
106 sccb->header.response_code);
107 rc = -EIO;
108 goto out;
109 }
110 sclp_fill_core_info(info, sccb);
111 out:
112 free_pages((unsigned long) sccb, get_order(length));
113 return rc;
114 }
115
116 struct cpu_configure_sccb {
117 struct sccb_header header;
118 } __attribute__((packed, aligned(8)));
119
do_core_configure(sclp_cmdw_t cmd)120 static int do_core_configure(sclp_cmdw_t cmd)
121 {
122 struct cpu_configure_sccb *sccb;
123 int rc;
124
125 if (!SCLP_HAS_CPU_RECONFIG)
126 return -EOPNOTSUPP;
127 /*
128 * This is not going to cross a page boundary since we force
129 * kmalloc to have a minimum alignment of 8 bytes on s390.
130 */
131 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
132 if (!sccb)
133 return -ENOMEM;
134 sccb->header.length = sizeof(*sccb);
135 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
136 if (rc)
137 goto out;
138 switch (sccb->header.response_code) {
139 case 0x0020:
140 case 0x0120:
141 break;
142 default:
143 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
144 cmd, sccb->header.response_code);
145 rc = -EIO;
146 break;
147 }
148 out:
149 kfree(sccb);
150 return rc;
151 }
152
sclp_core_configure(u8 core)153 int sclp_core_configure(u8 core)
154 {
155 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
156 }
157
sclp_core_deconfigure(u8 core)158 int sclp_core_deconfigure(u8 core)
159 {
160 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
161 }
162
163 #ifdef CONFIG_MEMORY_HOTPLUG
164
165 static DEFINE_MUTEX(sclp_mem_mutex);
166 static LIST_HEAD(sclp_mem_list);
167 static u8 sclp_max_storage_id;
168 static DECLARE_BITMAP(sclp_storage_ids, 256);
169
170 struct memory_increment {
171 struct list_head list;
172 u16 rn;
173 int standby;
174 };
175
176 struct assign_storage_sccb {
177 struct sccb_header header;
178 u16 rn;
179 } __packed;
180
arch_get_memory_phys_device(unsigned long start_pfn)181 int arch_get_memory_phys_device(unsigned long start_pfn)
182 {
183 if (!sclp.rzm)
184 return 0;
185 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
186 }
187
rn2addr(u16 rn)188 static unsigned long long rn2addr(u16 rn)
189 {
190 return (unsigned long long) (rn - 1) * sclp.rzm;
191 }
192
do_assign_storage(sclp_cmdw_t cmd,u16 rn)193 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
194 {
195 struct assign_storage_sccb *sccb;
196 int rc;
197
198 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
199 if (!sccb)
200 return -ENOMEM;
201 sccb->header.length = PAGE_SIZE;
202 sccb->rn = rn;
203 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
204 if (rc)
205 goto out;
206 switch (sccb->header.response_code) {
207 case 0x0020:
208 case 0x0120:
209 break;
210 default:
211 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
212 cmd, sccb->header.response_code, rn);
213 rc = -EIO;
214 break;
215 }
216 out:
217 free_page((unsigned long) sccb);
218 return rc;
219 }
220
sclp_assign_storage(u16 rn)221 static int sclp_assign_storage(u16 rn)
222 {
223 unsigned long long start;
224 int rc;
225
226 rc = do_assign_storage(0x000d0001, rn);
227 if (rc)
228 return rc;
229 start = rn2addr(rn);
230 storage_key_init_range(start, start + sclp.rzm);
231 return 0;
232 }
233
sclp_unassign_storage(u16 rn)234 static int sclp_unassign_storage(u16 rn)
235 {
236 return do_assign_storage(0x000c0001, rn);
237 }
238
239 struct attach_storage_sccb {
240 struct sccb_header header;
241 u16 :16;
242 u16 assigned;
243 u32 :32;
244 u32 entries[];
245 } __packed;
246
sclp_attach_storage(u8 id)247 static int sclp_attach_storage(u8 id)
248 {
249 struct attach_storage_sccb *sccb;
250 int rc;
251 int i;
252
253 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
254 if (!sccb)
255 return -ENOMEM;
256 sccb->header.length = PAGE_SIZE;
257 sccb->header.function_code = 0x40;
258 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
259 SCLP_QUEUE_INTERVAL);
260 if (rc)
261 goto out;
262 switch (sccb->header.response_code) {
263 case 0x0020:
264 set_bit(id, sclp_storage_ids);
265 for (i = 0; i < sccb->assigned; i++) {
266 if (sccb->entries[i])
267 sclp_unassign_storage(sccb->entries[i] >> 16);
268 }
269 break;
270 default:
271 rc = -EIO;
272 break;
273 }
274 out:
275 free_page((unsigned long) sccb);
276 return rc;
277 }
278
sclp_mem_change_state(unsigned long start,unsigned long size,int online)279 static int sclp_mem_change_state(unsigned long start, unsigned long size,
280 int online)
281 {
282 struct memory_increment *incr;
283 unsigned long long istart;
284 int rc = 0;
285
286 list_for_each_entry(incr, &sclp_mem_list, list) {
287 istart = rn2addr(incr->rn);
288 if (start + size - 1 < istart)
289 break;
290 if (start > istart + sclp.rzm - 1)
291 continue;
292 if (online)
293 rc |= sclp_assign_storage(incr->rn);
294 else
295 sclp_unassign_storage(incr->rn);
296 if (rc == 0)
297 incr->standby = online ? 0 : 1;
298 }
299 return rc ? -EIO : 0;
300 }
301
contains_standby_increment(unsigned long start,unsigned long end)302 static bool contains_standby_increment(unsigned long start, unsigned long end)
303 {
304 struct memory_increment *incr;
305 unsigned long istart;
306
307 list_for_each_entry(incr, &sclp_mem_list, list) {
308 istart = rn2addr(incr->rn);
309 if (end - 1 < istart)
310 continue;
311 if (start > istart + sclp.rzm - 1)
312 continue;
313 if (incr->standby)
314 return true;
315 }
316 return false;
317 }
318
sclp_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)319 static int sclp_mem_notifier(struct notifier_block *nb,
320 unsigned long action, void *data)
321 {
322 unsigned long start, size;
323 struct memory_notify *arg;
324 unsigned char id;
325 int rc = 0;
326
327 arg = data;
328 start = arg->start_pfn << PAGE_SHIFT;
329 size = arg->nr_pages << PAGE_SHIFT;
330 mutex_lock(&sclp_mem_mutex);
331 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
332 sclp_attach_storage(id);
333 switch (action) {
334 case MEM_GOING_OFFLINE:
335 /*
336 * We do not allow to set memory blocks offline that contain
337 * standby memory. This is done to simplify the "memory online"
338 * case.
339 */
340 if (contains_standby_increment(start, start + size))
341 rc = -EPERM;
342 break;
343 case MEM_ONLINE:
344 case MEM_CANCEL_OFFLINE:
345 break;
346 case MEM_GOING_ONLINE:
347 rc = sclp_mem_change_state(start, size, 1);
348 break;
349 case MEM_CANCEL_ONLINE:
350 sclp_mem_change_state(start, size, 0);
351 break;
352 case MEM_OFFLINE:
353 sclp_mem_change_state(start, size, 0);
354 break;
355 default:
356 rc = -EINVAL;
357 break;
358 }
359 mutex_unlock(&sclp_mem_mutex);
360 return rc ? NOTIFY_BAD : NOTIFY_OK;
361 }
362
363 static struct notifier_block sclp_mem_nb = {
364 .notifier_call = sclp_mem_notifier,
365 };
366
align_to_block_size(unsigned long long * start,unsigned long long * size,unsigned long long alignment)367 static void __init align_to_block_size(unsigned long long *start,
368 unsigned long long *size,
369 unsigned long long alignment)
370 {
371 unsigned long long start_align, size_align;
372
373 start_align = roundup(*start, alignment);
374 size_align = rounddown(*start + *size, alignment) - start_align;
375
376 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
377 *start, size_align >> 20, *size >> 20);
378 *start = start_align;
379 *size = size_align;
380 }
381
add_memory_merged(u16 rn)382 static void __init add_memory_merged(u16 rn)
383 {
384 unsigned long long start, size, addr, block_size;
385 static u16 first_rn, num;
386
387 if (rn && first_rn && (first_rn + num == rn)) {
388 num++;
389 return;
390 }
391 if (!first_rn)
392 goto skip_add;
393 start = rn2addr(first_rn);
394 size = (unsigned long long) num * sclp.rzm;
395 if (start >= ident_map_size)
396 goto skip_add;
397 if (start + size > ident_map_size)
398 size = ident_map_size - start;
399 block_size = memory_block_size_bytes();
400 align_to_block_size(&start, &size, block_size);
401 if (!size)
402 goto skip_add;
403 for (addr = start; addr < start + size; addr += block_size)
404 add_memory(0, addr, block_size, MHP_NONE);
405 skip_add:
406 first_rn = rn;
407 num = 1;
408 }
409
sclp_add_standby_memory(void)410 static void __init sclp_add_standby_memory(void)
411 {
412 struct memory_increment *incr;
413
414 list_for_each_entry(incr, &sclp_mem_list, list)
415 if (incr->standby)
416 add_memory_merged(incr->rn);
417 add_memory_merged(0);
418 }
419
insert_increment(u16 rn,int standby,int assigned)420 static void __init insert_increment(u16 rn, int standby, int assigned)
421 {
422 struct memory_increment *incr, *new_incr;
423 struct list_head *prev;
424 u16 last_rn;
425
426 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
427 if (!new_incr)
428 return;
429 new_incr->rn = rn;
430 new_incr->standby = standby;
431 last_rn = 0;
432 prev = &sclp_mem_list;
433 list_for_each_entry(incr, &sclp_mem_list, list) {
434 if (assigned && incr->rn > rn)
435 break;
436 if (!assigned && incr->rn - last_rn > 1)
437 break;
438 last_rn = incr->rn;
439 prev = &incr->list;
440 }
441 if (!assigned)
442 new_incr->rn = last_rn + 1;
443 if (new_incr->rn > sclp.rnmax) {
444 kfree(new_incr);
445 return;
446 }
447 list_add(&new_incr->list, prev);
448 }
449
sclp_detect_standby_memory(void)450 static int __init sclp_detect_standby_memory(void)
451 {
452 struct read_storage_sccb *sccb;
453 int i, id, assigned, rc;
454
455 if (oldmem_data.start) /* No standby memory in kdump mode */
456 return 0;
457 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
458 return 0;
459 rc = -ENOMEM;
460 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
461 if (!sccb)
462 goto out;
463 assigned = 0;
464 for (id = 0; id <= sclp_max_storage_id; id++) {
465 memset(sccb, 0, PAGE_SIZE);
466 sccb->header.length = PAGE_SIZE;
467 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
468 if (rc)
469 goto out;
470 switch (sccb->header.response_code) {
471 case 0x0010:
472 set_bit(id, sclp_storage_ids);
473 for (i = 0; i < sccb->assigned; i++) {
474 if (!sccb->entries[i])
475 continue;
476 assigned++;
477 insert_increment(sccb->entries[i] >> 16, 0, 1);
478 }
479 break;
480 case 0x0310:
481 break;
482 case 0x0410:
483 for (i = 0; i < sccb->assigned; i++) {
484 if (!sccb->entries[i])
485 continue;
486 assigned++;
487 insert_increment(sccb->entries[i] >> 16, 1, 1);
488 }
489 break;
490 default:
491 rc = -EIO;
492 break;
493 }
494 if (!rc)
495 sclp_max_storage_id = sccb->max_id;
496 }
497 if (rc || list_empty(&sclp_mem_list))
498 goto out;
499 for (i = 1; i <= sclp.rnmax - assigned; i++)
500 insert_increment(0, 1, 0);
501 rc = register_memory_notifier(&sclp_mem_nb);
502 if (rc)
503 goto out;
504 sclp_add_standby_memory();
505 out:
506 free_page((unsigned long) sccb);
507 return rc;
508 }
509 __initcall(sclp_detect_standby_memory);
510
511 #endif /* CONFIG_MEMORY_HOTPLUG */
512
513 /*
514 * Channel path configuration related functions.
515 */
516
517 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
518 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
519 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
520
521 struct chp_cfg_sccb {
522 struct sccb_header header;
523 u8 ccm;
524 u8 reserved[6];
525 u8 cssid;
526 } __attribute__((packed));
527
do_chp_configure(sclp_cmdw_t cmd)528 static int do_chp_configure(sclp_cmdw_t cmd)
529 {
530 struct chp_cfg_sccb *sccb;
531 int rc;
532
533 if (!SCLP_HAS_CHP_RECONFIG)
534 return -EOPNOTSUPP;
535 /* Prepare sccb. */
536 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
537 if (!sccb)
538 return -ENOMEM;
539 sccb->header.length = sizeof(*sccb);
540 rc = sclp_sync_request(cmd, sccb);
541 if (rc)
542 goto out;
543 switch (sccb->header.response_code) {
544 case 0x0020:
545 case 0x0120:
546 case 0x0440:
547 case 0x0450:
548 break;
549 default:
550 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
551 cmd, sccb->header.response_code);
552 rc = -EIO;
553 break;
554 }
555 out:
556 free_page((unsigned long) sccb);
557 return rc;
558 }
559
560 /**
561 * sclp_chp_configure - perform configure channel-path sclp command
562 * @chpid: channel-path ID
563 *
564 * Perform configure channel-path command sclp command for specified chpid.
565 * Return 0 after command successfully finished, non-zero otherwise.
566 */
sclp_chp_configure(struct chp_id chpid)567 int sclp_chp_configure(struct chp_id chpid)
568 {
569 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
570 }
571
572 /**
573 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
574 * @chpid: channel-path ID
575 *
576 * Perform deconfigure channel-path command sclp command for specified chpid
577 * and wait for completion. On success return 0. Return non-zero otherwise.
578 */
sclp_chp_deconfigure(struct chp_id chpid)579 int sclp_chp_deconfigure(struct chp_id chpid)
580 {
581 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
582 }
583
584 struct chp_info_sccb {
585 struct sccb_header header;
586 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
587 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
588 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
589 u8 ccm;
590 u8 reserved[6];
591 u8 cssid;
592 } __attribute__((packed));
593
594 /**
595 * sclp_chp_read_info - perform read channel-path information sclp command
596 * @info: resulting channel-path information data
597 *
598 * Perform read channel-path information sclp command and wait for completion.
599 * On success, store channel-path information in @info and return 0. Return
600 * non-zero otherwise.
601 */
sclp_chp_read_info(struct sclp_chp_info * info)602 int sclp_chp_read_info(struct sclp_chp_info *info)
603 {
604 struct chp_info_sccb *sccb;
605 int rc;
606
607 if (!SCLP_HAS_CHP_INFO)
608 return -EOPNOTSUPP;
609 /* Prepare sccb. */
610 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
611 if (!sccb)
612 return -ENOMEM;
613 sccb->header.length = sizeof(*sccb);
614 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
615 if (rc)
616 goto out;
617 if (sccb->header.response_code != 0x0010) {
618 pr_warn("read channel-path info failed (response=0x%04x)\n",
619 sccb->header.response_code);
620 rc = -EIO;
621 goto out;
622 }
623 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
624 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
625 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
626 out:
627 free_page((unsigned long) sccb);
628 return rc;
629 }
630