xref: /linux/drivers/s390/char/sclp_cmd.c (revision 3df692169e8486fc3dd91fcd5ea81c27a0bac033)
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/ctlreg.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 
32 static void sclp_sync_callback(struct sclp_req *req, void *data)
33 {
34 	struct completion *completion = data;
35 
36 	complete(completion);
37 }
38 
39 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
40 {
41 	return sclp_sync_request_timeout(cmd, sccb, 0);
42 }
43 
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 
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 
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 
153 int sclp_core_configure(u8 core)
154 {
155 	return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
156 }
157 
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 
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 
188 static unsigned long long rn2addr(u16 rn)
189 {
190 	return (unsigned long long) (rn - 1) * sclp.rzm;
191 }
192 
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 
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 
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 
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 
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 
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 
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 		break;
357 	}
358 	mutex_unlock(&sclp_mem_mutex);
359 	return rc ? NOTIFY_BAD : NOTIFY_OK;
360 }
361 
362 static struct notifier_block sclp_mem_nb = {
363 	.notifier_call = sclp_mem_notifier,
364 };
365 
366 static void __init align_to_block_size(unsigned long long *start,
367 				       unsigned long long *size,
368 				       unsigned long long alignment)
369 {
370 	unsigned long long start_align, size_align;
371 
372 	start_align = roundup(*start, alignment);
373 	size_align = rounddown(*start + *size, alignment) - start_align;
374 
375 	pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
376 		*start, size_align >> 20, *size >> 20);
377 	*start = start_align;
378 	*size = size_align;
379 }
380 
381 static void __init add_memory_merged(u16 rn)
382 {
383 	unsigned long long start, size, addr, block_size;
384 	static u16 first_rn, num;
385 
386 	if (rn && first_rn && (first_rn + num == rn)) {
387 		num++;
388 		return;
389 	}
390 	if (!first_rn)
391 		goto skip_add;
392 	start = rn2addr(first_rn);
393 	size = (unsigned long long) num * sclp.rzm;
394 	if (start >= ident_map_size)
395 		goto skip_add;
396 	if (start + size > ident_map_size)
397 		size = ident_map_size - start;
398 	block_size = memory_block_size_bytes();
399 	align_to_block_size(&start, &size, block_size);
400 	if (!size)
401 		goto skip_add;
402 	for (addr = start; addr < start + size; addr += block_size)
403 		add_memory(0, addr, block_size, MHP_NONE);
404 skip_add:
405 	first_rn = rn;
406 	num = 1;
407 }
408 
409 static void __init sclp_add_standby_memory(void)
410 {
411 	struct memory_increment *incr;
412 
413 	list_for_each_entry(incr, &sclp_mem_list, list)
414 		if (incr->standby)
415 			add_memory_merged(incr->rn);
416 	add_memory_merged(0);
417 }
418 
419 static void __init insert_increment(u16 rn, int standby, int assigned)
420 {
421 	struct memory_increment *incr, *new_incr;
422 	struct list_head *prev;
423 	u16 last_rn;
424 
425 	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
426 	if (!new_incr)
427 		return;
428 	new_incr->rn = rn;
429 	new_incr->standby = standby;
430 	last_rn = 0;
431 	prev = &sclp_mem_list;
432 	list_for_each_entry(incr, &sclp_mem_list, list) {
433 		if (assigned && incr->rn > rn)
434 			break;
435 		if (!assigned && incr->rn - last_rn > 1)
436 			break;
437 		last_rn = incr->rn;
438 		prev = &incr->list;
439 	}
440 	if (!assigned)
441 		new_incr->rn = last_rn + 1;
442 	if (new_incr->rn > sclp.rnmax) {
443 		kfree(new_incr);
444 		return;
445 	}
446 	list_add(&new_incr->list, prev);
447 }
448 
449 static int __init sclp_detect_standby_memory(void)
450 {
451 	struct read_storage_sccb *sccb;
452 	int i, id, assigned, rc;
453 
454 	if (oldmem_data.start) /* No standby memory in kdump mode */
455 		return 0;
456 	if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
457 		return 0;
458 	rc = -ENOMEM;
459 	sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
460 	if (!sccb)
461 		goto out;
462 	assigned = 0;
463 	for (id = 0; id <= sclp_max_storage_id; id++) {
464 		memset(sccb, 0, PAGE_SIZE);
465 		sccb->header.length = PAGE_SIZE;
466 		rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
467 		if (rc)
468 			goto out;
469 		switch (sccb->header.response_code) {
470 		case 0x0010:
471 			set_bit(id, sclp_storage_ids);
472 			for (i = 0; i < sccb->assigned; i++) {
473 				if (!sccb->entries[i])
474 					continue;
475 				assigned++;
476 				insert_increment(sccb->entries[i] >> 16, 0, 1);
477 			}
478 			break;
479 		case 0x0310:
480 			break;
481 		case 0x0410:
482 			for (i = 0; i < sccb->assigned; i++) {
483 				if (!sccb->entries[i])
484 					continue;
485 				assigned++;
486 				insert_increment(sccb->entries[i] >> 16, 1, 1);
487 			}
488 			break;
489 		default:
490 			rc = -EIO;
491 			break;
492 		}
493 		if (!rc)
494 			sclp_max_storage_id = sccb->max_id;
495 	}
496 	if (rc || list_empty(&sclp_mem_list))
497 		goto out;
498 	for (i = 1; i <= sclp.rnmax - assigned; i++)
499 		insert_increment(0, 1, 0);
500 	rc = register_memory_notifier(&sclp_mem_nb);
501 	if (rc)
502 		goto out;
503 	sclp_add_standby_memory();
504 out:
505 	free_page((unsigned long) sccb);
506 	return rc;
507 }
508 __initcall(sclp_detect_standby_memory);
509 
510 #endif /* CONFIG_MEMORY_HOTPLUG */
511 
512 /*
513  * Channel path configuration related functions.
514  */
515 
516 #define SCLP_CMDW_CONFIGURE_CHPATH		0x000f0001
517 #define SCLP_CMDW_DECONFIGURE_CHPATH		0x000e0001
518 #define SCLP_CMDW_READ_CHPATH_INFORMATION	0x00030001
519 
520 struct chp_cfg_sccb {
521 	struct sccb_header header;
522 	u8 ccm;
523 	u8 reserved[6];
524 	u8 cssid;
525 } __attribute__((packed));
526 
527 static int do_chp_configure(sclp_cmdw_t cmd)
528 {
529 	struct chp_cfg_sccb *sccb;
530 	int rc;
531 
532 	if (!SCLP_HAS_CHP_RECONFIG)
533 		return -EOPNOTSUPP;
534 	/* Prepare sccb. */
535 	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
536 	if (!sccb)
537 		return -ENOMEM;
538 	sccb->header.length = sizeof(*sccb);
539 	rc = sclp_sync_request(cmd, sccb);
540 	if (rc)
541 		goto out;
542 	switch (sccb->header.response_code) {
543 	case 0x0020:
544 	case 0x0120:
545 	case 0x0440:
546 	case 0x0450:
547 		break;
548 	default:
549 		pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
550 			cmd, sccb->header.response_code);
551 		rc = -EIO;
552 		break;
553 	}
554 out:
555 	free_page((unsigned long) sccb);
556 	return rc;
557 }
558 
559 /**
560  * sclp_chp_configure - perform configure channel-path sclp command
561  * @chpid: channel-path ID
562  *
563  * Perform configure channel-path command sclp command for specified chpid.
564  * Return 0 after command successfully finished, non-zero otherwise.
565  */
566 int sclp_chp_configure(struct chp_id chpid)
567 {
568 	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
569 }
570 
571 /**
572  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
573  * @chpid: channel-path ID
574  *
575  * Perform deconfigure channel-path command sclp command for specified chpid
576  * and wait for completion. On success return 0. Return non-zero otherwise.
577  */
578 int sclp_chp_deconfigure(struct chp_id chpid)
579 {
580 	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
581 }
582 
583 struct chp_info_sccb {
584 	struct sccb_header header;
585 	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
586 	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
587 	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
588 	u8 ccm;
589 	u8 reserved[6];
590 	u8 cssid;
591 } __attribute__((packed));
592 
593 /**
594  * sclp_chp_read_info - perform read channel-path information sclp command
595  * @info: resulting channel-path information data
596  *
597  * Perform read channel-path information sclp command and wait for completion.
598  * On success, store channel-path information in @info and return 0. Return
599  * non-zero otherwise.
600  */
601 int sclp_chp_read_info(struct sclp_chp_info *info)
602 {
603 	struct chp_info_sccb *sccb;
604 	int rc;
605 
606 	if (!SCLP_HAS_CHP_INFO)
607 		return -EOPNOTSUPP;
608 	/* Prepare sccb. */
609 	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
610 	if (!sccb)
611 		return -ENOMEM;
612 	sccb->header.length = sizeof(*sccb);
613 	rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
614 	if (rc)
615 		goto out;
616 	if (sccb->header.response_code != 0x0010) {
617 		pr_warn("read channel-path info failed (response=0x%04x)\n",
618 			sccb->header.response_code);
619 		rc = -EIO;
620 		goto out;
621 	}
622 	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
623 	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
624 	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
625 out:
626 	free_page((unsigned long) sccb);
627 	return rc;
628 }
629