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[0];
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 >= VMEM_MAX_PHYS)
396 		goto skip_add;
397 	if (start + size > VMEM_MAX_PHYS)
398 		size = VMEM_MAX_PHYS - start;
399 	if (start >= ident_map_size)
400 		goto skip_add;
401 	if (start + size > ident_map_size)
402 		size = ident_map_size - start;
403 	block_size = memory_block_size_bytes();
404 	align_to_block_size(&start, &size, block_size);
405 	if (!size)
406 		goto skip_add;
407 	for (addr = start; addr < start + size; addr += block_size)
408 		add_memory(0, addr, block_size, MHP_NONE);
409 skip_add:
410 	first_rn = rn;
411 	num = 1;
412 }
413 
sclp_add_standby_memory(void)414 static void __init sclp_add_standby_memory(void)
415 {
416 	struct memory_increment *incr;
417 
418 	list_for_each_entry(incr, &sclp_mem_list, list)
419 		if (incr->standby)
420 			add_memory_merged(incr->rn);
421 	add_memory_merged(0);
422 }
423 
insert_increment(u16 rn,int standby,int assigned)424 static void __init insert_increment(u16 rn, int standby, int assigned)
425 {
426 	struct memory_increment *incr, *new_incr;
427 	struct list_head *prev;
428 	u16 last_rn;
429 
430 	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
431 	if (!new_incr)
432 		return;
433 	new_incr->rn = rn;
434 	new_incr->standby = standby;
435 	last_rn = 0;
436 	prev = &sclp_mem_list;
437 	list_for_each_entry(incr, &sclp_mem_list, list) {
438 		if (assigned && incr->rn > rn)
439 			break;
440 		if (!assigned && incr->rn - last_rn > 1)
441 			break;
442 		last_rn = incr->rn;
443 		prev = &incr->list;
444 	}
445 	if (!assigned)
446 		new_incr->rn = last_rn + 1;
447 	if (new_incr->rn > sclp.rnmax) {
448 		kfree(new_incr);
449 		return;
450 	}
451 	list_add(&new_incr->list, prev);
452 }
453 
sclp_detect_standby_memory(void)454 static int __init sclp_detect_standby_memory(void)
455 {
456 	struct read_storage_sccb *sccb;
457 	int i, id, assigned, rc;
458 
459 	if (oldmem_data.start) /* No standby memory in kdump mode */
460 		return 0;
461 	if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
462 		return 0;
463 	rc = -ENOMEM;
464 	sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
465 	if (!sccb)
466 		goto out;
467 	assigned = 0;
468 	for (id = 0; id <= sclp_max_storage_id; id++) {
469 		memset(sccb, 0, PAGE_SIZE);
470 		sccb->header.length = PAGE_SIZE;
471 		rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
472 		if (rc)
473 			goto out;
474 		switch (sccb->header.response_code) {
475 		case 0x0010:
476 			set_bit(id, sclp_storage_ids);
477 			for (i = 0; i < sccb->assigned; i++) {
478 				if (!sccb->entries[i])
479 					continue;
480 				assigned++;
481 				insert_increment(sccb->entries[i] >> 16, 0, 1);
482 			}
483 			break;
484 		case 0x0310:
485 			break;
486 		case 0x0410:
487 			for (i = 0; i < sccb->assigned; i++) {
488 				if (!sccb->entries[i])
489 					continue;
490 				assigned++;
491 				insert_increment(sccb->entries[i] >> 16, 1, 1);
492 			}
493 			break;
494 		default:
495 			rc = -EIO;
496 			break;
497 		}
498 		if (!rc)
499 			sclp_max_storage_id = sccb->max_id;
500 	}
501 	if (rc || list_empty(&sclp_mem_list))
502 		goto out;
503 	for (i = 1; i <= sclp.rnmax - assigned; i++)
504 		insert_increment(0, 1, 0);
505 	rc = register_memory_notifier(&sclp_mem_nb);
506 	if (rc)
507 		goto out;
508 	sclp_add_standby_memory();
509 out:
510 	free_page((unsigned long) sccb);
511 	return rc;
512 }
513 __initcall(sclp_detect_standby_memory);
514 
515 #endif /* CONFIG_MEMORY_HOTPLUG */
516 
517 /*
518  * Channel path configuration related functions.
519  */
520 
521 #define SCLP_CMDW_CONFIGURE_CHPATH		0x000f0001
522 #define SCLP_CMDW_DECONFIGURE_CHPATH		0x000e0001
523 #define SCLP_CMDW_READ_CHPATH_INFORMATION	0x00030001
524 
525 struct chp_cfg_sccb {
526 	struct sccb_header header;
527 	u8 ccm;
528 	u8 reserved[6];
529 	u8 cssid;
530 } __attribute__((packed));
531 
do_chp_configure(sclp_cmdw_t cmd)532 static int do_chp_configure(sclp_cmdw_t cmd)
533 {
534 	struct chp_cfg_sccb *sccb;
535 	int rc;
536 
537 	if (!SCLP_HAS_CHP_RECONFIG)
538 		return -EOPNOTSUPP;
539 	/* Prepare sccb. */
540 	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
541 	if (!sccb)
542 		return -ENOMEM;
543 	sccb->header.length = sizeof(*sccb);
544 	rc = sclp_sync_request(cmd, sccb);
545 	if (rc)
546 		goto out;
547 	switch (sccb->header.response_code) {
548 	case 0x0020:
549 	case 0x0120:
550 	case 0x0440:
551 	case 0x0450:
552 		break;
553 	default:
554 		pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
555 			cmd, sccb->header.response_code);
556 		rc = -EIO;
557 		break;
558 	}
559 out:
560 	free_page((unsigned long) sccb);
561 	return rc;
562 }
563 
564 /**
565  * sclp_chp_configure - perform configure channel-path sclp command
566  * @chpid: channel-path ID
567  *
568  * Perform configure channel-path command sclp command for specified chpid.
569  * Return 0 after command successfully finished, non-zero otherwise.
570  */
sclp_chp_configure(struct chp_id chpid)571 int sclp_chp_configure(struct chp_id chpid)
572 {
573 	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
574 }
575 
576 /**
577  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
578  * @chpid: channel-path ID
579  *
580  * Perform deconfigure channel-path command sclp command for specified chpid
581  * and wait for completion. On success return 0. Return non-zero otherwise.
582  */
sclp_chp_deconfigure(struct chp_id chpid)583 int sclp_chp_deconfigure(struct chp_id chpid)
584 {
585 	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
586 }
587 
588 struct chp_info_sccb {
589 	struct sccb_header header;
590 	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
591 	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
592 	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
593 	u8 ccm;
594 	u8 reserved[6];
595 	u8 cssid;
596 } __attribute__((packed));
597 
598 /**
599  * sclp_chp_read_info - perform read channel-path information sclp command
600  * @info: resulting channel-path information data
601  *
602  * Perform read channel-path information sclp command and wait for completion.
603  * On success, store channel-path information in @info and return 0. Return
604  * non-zero otherwise.
605  */
sclp_chp_read_info(struct sclp_chp_info * info)606 int sclp_chp_read_info(struct sclp_chp_info *info)
607 {
608 	struct chp_info_sccb *sccb;
609 	int rc;
610 
611 	if (!SCLP_HAS_CHP_INFO)
612 		return -EOPNOTSUPP;
613 	/* Prepare sccb. */
614 	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
615 	if (!sccb)
616 		return -ENOMEM;
617 	sccb->header.length = sizeof(*sccb);
618 	rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
619 	if (rc)
620 		goto out;
621 	if (sccb->header.response_code != 0x0010) {
622 		pr_warn("read channel-path info failed (response=0x%04x)\n",
623 			sccb->header.response_code);
624 		rc = -EIO;
625 		goto out;
626 	}
627 	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
628 	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
629 	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
630 out:
631 	free_page((unsigned long) sccb);
632 	return rc;
633 }
634