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
34 #define SCLP_CMDW_ASSIGN_STORAGE 0x000d0001
35 #define SCLP_CMDW_UNASSIGN_STORAGE 0x000c0001
36
sclp_sync_callback(struct sclp_req * req,void * data)37 static void sclp_sync_callback(struct sclp_req *req, void *data)
38 {
39 struct completion *completion = data;
40
41 complete(completion);
42 }
43
sclp_sync_request(sclp_cmdw_t cmd,void * sccb)44 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
45 {
46 return sclp_sync_request_timeout(cmd, sccb, 0);
47 }
48
sclp_sync_request_timeout(sclp_cmdw_t cmd,void * sccb,int timeout)49 int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
50 {
51 struct completion completion;
52 struct sclp_req *request;
53 int rc;
54
55 request = kzalloc(sizeof(*request), GFP_KERNEL);
56 if (!request)
57 return -ENOMEM;
58 if (timeout)
59 request->queue_timeout = timeout;
60 request->command = cmd;
61 request->sccb = sccb;
62 request->status = SCLP_REQ_FILLED;
63 request->callback = sclp_sync_callback;
64 request->callback_data = &completion;
65 init_completion(&completion);
66
67 /* Perform sclp request. */
68 rc = sclp_add_request(request);
69 if (rc)
70 goto out;
71 wait_for_completion(&completion);
72
73 /* Check response. */
74 if (request->status != SCLP_REQ_DONE) {
75 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
76 cmd, request->status);
77 rc = -EIO;
78 }
79 out:
80 kfree(request);
81 return rc;
82 }
83
84 /*
85 * CPU configuration related functions.
86 */
87
88 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
89 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
90
_sclp_get_core_info(struct sclp_core_info * info)91 int _sclp_get_core_info(struct sclp_core_info *info)
92 {
93 int rc;
94 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
95 struct read_cpu_info_sccb *sccb;
96
97 if (!SCLP_HAS_CPU_INFO)
98 return -EOPNOTSUPP;
99
100 sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
101 if (!sccb)
102 return -ENOMEM;
103 sccb->header.length = length;
104 sccb->header.control_mask[2] = 0x80;
105 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
106 SCLP_QUEUE_INTERVAL);
107 if (rc)
108 goto out;
109 if (sccb->header.response_code != 0x0010) {
110 pr_warn("readcpuinfo failed (response=0x%04x)\n",
111 sccb->header.response_code);
112 rc = -EIO;
113 goto out;
114 }
115 sclp_fill_core_info(info, sccb);
116 out:
117 free_pages((unsigned long) sccb, get_order(length));
118 return rc;
119 }
120
121 struct cpu_configure_sccb {
122 struct sccb_header header;
123 } __attribute__((packed, aligned(8)));
124
do_core_configure(sclp_cmdw_t cmd)125 static int do_core_configure(sclp_cmdw_t cmd)
126 {
127 struct cpu_configure_sccb *sccb;
128 int rc;
129
130 if (!SCLP_HAS_CPU_RECONFIG)
131 return -EOPNOTSUPP;
132 /*
133 * This is not going to cross a page boundary since we force
134 * kmalloc to have a minimum alignment of 8 bytes on s390.
135 */
136 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
137 if (!sccb)
138 return -ENOMEM;
139 sccb->header.length = sizeof(*sccb);
140 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
141 if (rc)
142 goto out;
143 switch (sccb->header.response_code) {
144 case 0x0020:
145 case 0x0120:
146 break;
147 default:
148 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
149 cmd, sccb->header.response_code);
150 rc = -EIO;
151 break;
152 }
153 out:
154 kfree(sccb);
155 return rc;
156 }
157
sclp_core_configure(u8 core)158 int sclp_core_configure(u8 core)
159 {
160 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
161 }
162
sclp_core_deconfigure(u8 core)163 int sclp_core_deconfigure(u8 core)
164 {
165 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
166 }
167
168 #ifdef CONFIG_MEMORY_HOTPLUG
169
170 static DEFINE_MUTEX(sclp_mem_mutex);
171 static LIST_HEAD(sclp_mem_list);
172 static u8 sclp_max_storage_id;
173 static DECLARE_BITMAP(sclp_storage_ids, 256);
174
175 struct memory_increment {
176 struct list_head list;
177 u16 rn;
178 int standby;
179 };
180
181 struct assign_storage_sccb {
182 struct sccb_header header;
183 u16 rn;
184 } __packed;
185
arch_get_memory_phys_device(unsigned long start_pfn)186 int arch_get_memory_phys_device(unsigned long start_pfn)
187 {
188 if (!sclp.rzm)
189 return 0;
190 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
191 }
192
rn2addr(u16 rn)193 static unsigned long long rn2addr(u16 rn)
194 {
195 return (unsigned long long) (rn - 1) * sclp.rzm;
196 }
197
do_assign_storage(sclp_cmdw_t cmd,u16 rn)198 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
199 {
200 struct assign_storage_sccb *sccb;
201 int rc;
202
203 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
204 if (!sccb)
205 return -ENOMEM;
206 sccb->header.length = PAGE_SIZE;
207 sccb->rn = rn;
208 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
209 if (rc)
210 goto out;
211 switch (sccb->header.response_code) {
212 case 0x0020:
213 case 0x0120:
214 break;
215 default:
216 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
217 cmd, sccb->header.response_code, rn);
218 rc = -EIO;
219 break;
220 }
221 out:
222 free_page((unsigned long) sccb);
223 return rc;
224 }
225
sclp_assign_storage(u16 rn)226 static int sclp_assign_storage(u16 rn)
227 {
228 unsigned long long start;
229 int rc;
230
231 rc = do_assign_storage(SCLP_CMDW_ASSIGN_STORAGE, rn);
232 if (rc)
233 return rc;
234 start = rn2addr(rn);
235 storage_key_init_range(start, start + sclp.rzm);
236 return 0;
237 }
238
sclp_unassign_storage(u16 rn)239 static int sclp_unassign_storage(u16 rn)
240 {
241 return do_assign_storage(SCLP_CMDW_UNASSIGN_STORAGE, rn);
242 }
243
244 struct attach_storage_sccb {
245 struct sccb_header header;
246 u16 :16;
247 u16 assigned;
248 u32 :32;
249 u32 entries[];
250 } __packed;
251
sclp_attach_storage(u8 id)252 static int sclp_attach_storage(u8 id)
253 {
254 struct attach_storage_sccb *sccb;
255 int rc;
256 int i;
257
258 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
259 if (!sccb)
260 return -ENOMEM;
261 sccb->header.length = PAGE_SIZE;
262 sccb->header.function_code = 0x40;
263 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
264 SCLP_QUEUE_INTERVAL);
265 if (rc)
266 goto out;
267 switch (sccb->header.response_code) {
268 case 0x0020:
269 set_bit(id, sclp_storage_ids);
270 for (i = 0; i < sccb->assigned; i++) {
271 if (sccb->entries[i])
272 sclp_unassign_storage(sccb->entries[i] >> 16);
273 }
274 break;
275 default:
276 rc = -EIO;
277 break;
278 }
279 out:
280 free_page((unsigned long) sccb);
281 return rc;
282 }
283
sclp_mem_change_state(unsigned long start,unsigned long size,int online)284 static int sclp_mem_change_state(unsigned long start, unsigned long size,
285 int online)
286 {
287 struct memory_increment *incr;
288 unsigned long long istart;
289 int rc = 0;
290
291 list_for_each_entry(incr, &sclp_mem_list, list) {
292 istart = rn2addr(incr->rn);
293 if (start + size - 1 < istart)
294 break;
295 if (start > istart + sclp.rzm - 1)
296 continue;
297 if (online)
298 rc |= sclp_assign_storage(incr->rn);
299 else
300 sclp_unassign_storage(incr->rn);
301 if (rc == 0)
302 incr->standby = online ? 0 : 1;
303 }
304 return rc ? -EIO : 0;
305 }
306
contains_standby_increment(unsigned long start,unsigned long end)307 static bool contains_standby_increment(unsigned long start, unsigned long end)
308 {
309 struct memory_increment *incr;
310 unsigned long istart;
311
312 list_for_each_entry(incr, &sclp_mem_list, list) {
313 istart = rn2addr(incr->rn);
314 if (end - 1 < istart)
315 continue;
316 if (start > istart + sclp.rzm - 1)
317 continue;
318 if (incr->standby)
319 return true;
320 }
321 return false;
322 }
323
sclp_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)324 static int sclp_mem_notifier(struct notifier_block *nb,
325 unsigned long action, void *data)
326 {
327 unsigned long start, size;
328 struct memory_notify *arg;
329 unsigned char id;
330 int rc = 0;
331
332 arg = data;
333 start = arg->start_pfn << PAGE_SHIFT;
334 size = arg->nr_pages << PAGE_SHIFT;
335 mutex_lock(&sclp_mem_mutex);
336 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
337 sclp_attach_storage(id);
338 switch (action) {
339 case MEM_GOING_OFFLINE:
340 /*
341 * We do not allow to set memory blocks offline that contain
342 * standby memory. This is done to simplify the "memory online"
343 * case.
344 */
345 if (contains_standby_increment(start, start + size))
346 rc = -EPERM;
347 break;
348 case MEM_PREPARE_ONLINE:
349 /*
350 * Access the altmap_start_pfn and altmap_nr_pages fields
351 * within the struct memory_notify specifically when dealing
352 * with only MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers.
353 *
354 * When altmap is in use, take the specified memory range
355 * online, which includes the altmap.
356 */
357 if (arg->altmap_nr_pages) {
358 start = PFN_PHYS(arg->altmap_start_pfn);
359 size += PFN_PHYS(arg->altmap_nr_pages);
360 }
361 rc = sclp_mem_change_state(start, size, 1);
362 if (rc || !arg->altmap_nr_pages)
363 break;
364 /*
365 * Set CMMA state to nodat here, since the struct page memory
366 * at the beginning of the memory block will not go through the
367 * buddy allocator later.
368 */
369 __arch_set_page_nodat((void *)__va(start), arg->altmap_nr_pages);
370 break;
371 case MEM_FINISH_OFFLINE:
372 /*
373 * When altmap is in use, take the specified memory range
374 * offline, which includes the altmap.
375 */
376 if (arg->altmap_nr_pages) {
377 start = PFN_PHYS(arg->altmap_start_pfn);
378 size += PFN_PHYS(arg->altmap_nr_pages);
379 }
380 sclp_mem_change_state(start, size, 0);
381 break;
382 default:
383 break;
384 }
385 mutex_unlock(&sclp_mem_mutex);
386 return rc ? NOTIFY_BAD : NOTIFY_OK;
387 }
388
389 static struct notifier_block sclp_mem_nb = {
390 .notifier_call = sclp_mem_notifier,
391 };
392
align_to_block_size(unsigned long long * start,unsigned long long * size,unsigned long long alignment)393 static void __init align_to_block_size(unsigned long long *start,
394 unsigned long long *size,
395 unsigned long long alignment)
396 {
397 unsigned long long start_align, size_align;
398
399 start_align = roundup(*start, alignment);
400 size_align = rounddown(*start + *size, alignment) - start_align;
401
402 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
403 *start, size_align >> 20, *size >> 20);
404 *start = start_align;
405 *size = size_align;
406 }
407
add_memory_merged(u16 rn)408 static void __init add_memory_merged(u16 rn)
409 {
410 unsigned long long start, size, addr, block_size;
411 static u16 first_rn, num;
412
413 if (rn && first_rn && (first_rn + num == rn)) {
414 num++;
415 return;
416 }
417 if (!first_rn)
418 goto skip_add;
419 start = rn2addr(first_rn);
420 size = (unsigned long long) num * sclp.rzm;
421 if (start >= ident_map_size)
422 goto skip_add;
423 if (start + size > ident_map_size)
424 size = ident_map_size - start;
425 block_size = memory_block_size_bytes();
426 align_to_block_size(&start, &size, block_size);
427 if (!size)
428 goto skip_add;
429 for (addr = start; addr < start + size; addr += block_size)
430 add_memory(0, addr, block_size,
431 MACHINE_HAS_EDAT1 ?
432 MHP_MEMMAP_ON_MEMORY | MHP_OFFLINE_INACCESSIBLE : MHP_NONE);
433 skip_add:
434 first_rn = rn;
435 num = 1;
436 }
437
sclp_add_standby_memory(void)438 static void __init sclp_add_standby_memory(void)
439 {
440 struct memory_increment *incr;
441
442 list_for_each_entry(incr, &sclp_mem_list, list)
443 if (incr->standby)
444 add_memory_merged(incr->rn);
445 add_memory_merged(0);
446 }
447
insert_increment(u16 rn,int standby,int assigned)448 static void __init insert_increment(u16 rn, int standby, int assigned)
449 {
450 struct memory_increment *incr, *new_incr;
451 struct list_head *prev;
452 u16 last_rn;
453
454 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
455 if (!new_incr)
456 return;
457 new_incr->rn = rn;
458 new_incr->standby = standby;
459 last_rn = 0;
460 prev = &sclp_mem_list;
461 list_for_each_entry(incr, &sclp_mem_list, list) {
462 if (assigned && incr->rn > rn)
463 break;
464 if (!assigned && incr->rn - last_rn > 1)
465 break;
466 last_rn = incr->rn;
467 prev = &incr->list;
468 }
469 if (!assigned)
470 new_incr->rn = last_rn + 1;
471 if (new_incr->rn > sclp.rnmax) {
472 kfree(new_incr);
473 return;
474 }
475 list_add(&new_incr->list, prev);
476 }
477
sclp_detect_standby_memory(void)478 static int __init sclp_detect_standby_memory(void)
479 {
480 struct read_storage_sccb *sccb;
481 int i, id, assigned, rc;
482
483 if (oldmem_data.start) /* No standby memory in kdump mode */
484 return 0;
485 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
486 return 0;
487 rc = -ENOMEM;
488 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
489 if (!sccb)
490 goto out;
491 assigned = 0;
492 for (id = 0; id <= sclp_max_storage_id; id++) {
493 memset(sccb, 0, PAGE_SIZE);
494 sccb->header.length = PAGE_SIZE;
495 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
496 if (rc)
497 goto out;
498 switch (sccb->header.response_code) {
499 case 0x0010:
500 set_bit(id, sclp_storage_ids);
501 for (i = 0; i < sccb->assigned; i++) {
502 if (!sccb->entries[i])
503 continue;
504 assigned++;
505 insert_increment(sccb->entries[i] >> 16, 0, 1);
506 }
507 break;
508 case 0x0310:
509 break;
510 case 0x0410:
511 for (i = 0; i < sccb->assigned; i++) {
512 if (!sccb->entries[i])
513 continue;
514 assigned++;
515 insert_increment(sccb->entries[i] >> 16, 1, 1);
516 }
517 break;
518 default:
519 rc = -EIO;
520 break;
521 }
522 if (!rc)
523 sclp_max_storage_id = sccb->max_id;
524 }
525 if (rc || list_empty(&sclp_mem_list))
526 goto out;
527 for (i = 1; i <= sclp.rnmax - assigned; i++)
528 insert_increment(0, 1, 0);
529 rc = register_memory_notifier(&sclp_mem_nb);
530 if (rc)
531 goto out;
532 sclp_add_standby_memory();
533 out:
534 free_page((unsigned long) sccb);
535 return rc;
536 }
537 __initcall(sclp_detect_standby_memory);
538
539 #endif /* CONFIG_MEMORY_HOTPLUG */
540
541 /*
542 * Channel path configuration related functions.
543 */
544
545 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
546 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
547 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
548
549 struct chp_cfg_sccb {
550 struct sccb_header header;
551 u8 ccm;
552 u8 reserved[6];
553 u8 cssid;
554 } __attribute__((packed));
555
do_chp_configure(sclp_cmdw_t cmd)556 static int do_chp_configure(sclp_cmdw_t cmd)
557 {
558 struct chp_cfg_sccb *sccb;
559 int rc;
560
561 if (!SCLP_HAS_CHP_RECONFIG)
562 return -EOPNOTSUPP;
563 /* Prepare sccb. */
564 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
565 if (!sccb)
566 return -ENOMEM;
567 sccb->header.length = sizeof(*sccb);
568 rc = sclp_sync_request(cmd, sccb);
569 if (rc)
570 goto out;
571 switch (sccb->header.response_code) {
572 case 0x0020:
573 case 0x0120:
574 case 0x0440:
575 case 0x0450:
576 break;
577 default:
578 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
579 cmd, sccb->header.response_code);
580 rc = -EIO;
581 break;
582 }
583 out:
584 free_page((unsigned long) sccb);
585 return rc;
586 }
587
588 /**
589 * sclp_chp_configure - perform configure channel-path sclp command
590 * @chpid: channel-path ID
591 *
592 * Perform configure channel-path command sclp command for specified chpid.
593 * Return 0 after command successfully finished, non-zero otherwise.
594 */
sclp_chp_configure(struct chp_id chpid)595 int sclp_chp_configure(struct chp_id chpid)
596 {
597 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
598 }
599
600 /**
601 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
602 * @chpid: channel-path ID
603 *
604 * Perform deconfigure channel-path command sclp command for specified chpid
605 * and wait for completion. On success return 0. Return non-zero otherwise.
606 */
sclp_chp_deconfigure(struct chp_id chpid)607 int sclp_chp_deconfigure(struct chp_id chpid)
608 {
609 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
610 }
611
612 struct chp_info_sccb {
613 struct sccb_header header;
614 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
615 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
616 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
617 u8 ccm;
618 u8 reserved[6];
619 u8 cssid;
620 } __attribute__((packed));
621
622 /**
623 * sclp_chp_read_info - perform read channel-path information sclp command
624 * @info: resulting channel-path information data
625 *
626 * Perform read channel-path information sclp command and wait for completion.
627 * On success, store channel-path information in @info and return 0. Return
628 * non-zero otherwise.
629 */
sclp_chp_read_info(struct sclp_chp_info * info)630 int sclp_chp_read_info(struct sclp_chp_info *info)
631 {
632 struct chp_info_sccb *sccb;
633 int rc;
634
635 if (!SCLP_HAS_CHP_INFO)
636 return -EOPNOTSUPP;
637 /* Prepare sccb. */
638 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
639 if (!sccb)
640 return -ENOMEM;
641 sccb->header.length = sizeof(*sccb);
642 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
643 if (rc)
644 goto out;
645 if (sccb->header.response_code != 0x0010) {
646 pr_warn("read channel-path info failed (response=0x%04x)\n",
647 sccb->header.response_code);
648 rc = -EIO;
649 goto out;
650 }
651 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
652 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
653 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
654 out:
655 free_page((unsigned long) sccb);
656 return rc;
657 }
658