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
32static void sclp_sync_callback(struct sclp_req *req, void *data)
33{
34	struct completion *completion = data;
35
36	complete(completion);
37}
38
39int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
40{
41	return sclp_sync_request_timeout(cmd, sccb, 0);
42}
43
44int 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	}
74out:
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
86int _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);
111out:
112	free_pages((unsigned long) sccb, get_order(length));
113	return rc;
114}
115
116struct cpu_configure_sccb {
117	struct sccb_header header;
118} __attribute__((packed, aligned(8)));
119
120static 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	}
148out:
149	kfree(sccb);
150	return rc;
151}
152
153int sclp_core_configure(u8 core)
154{
155	return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
156}
157
158int 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
165static DEFINE_MUTEX(sclp_mem_mutex);
166static LIST_HEAD(sclp_mem_list);
167static u8 sclp_max_storage_id;
168static DECLARE_BITMAP(sclp_storage_ids, 256);
169
170struct memory_increment {
171	struct list_head list;
172	u16 rn;
173	int standby;
174};
175
176struct assign_storage_sccb {
177	struct sccb_header header;
178	u16 rn;
179} __packed;
180
181int 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
188static unsigned long long rn2addr(u16 rn)
189{
190	return (unsigned long long) (rn - 1) * sclp.rzm;
191}
192
193static 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	}
216out:
217	free_page((unsigned long) sccb);
218	return rc;
219}
220
221static 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
234static int sclp_unassign_storage(u16 rn)
235{
236	return do_assign_storage(0x000c0001, rn);
237}
238
239struct attach_storage_sccb {
240	struct sccb_header header;
241	u16 :16;
242	u16 assigned;
243	u32 :32;
244	u32 entries[];
245} __packed;
246
247static 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	}
274out:
275	free_page((unsigned long) sccb);
276	return rc;
277}
278
279static 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
302static 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
319static 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
363static struct notifier_block sclp_mem_nb = {
364	.notifier_call = sclp_mem_notifier,
365};
366
367static 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
382static 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);
405skip_add:
406	first_rn = rn;
407	num = 1;
408}
409
410static 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
420static 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
450static 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();
505out:
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
521struct chp_cfg_sccb {
522	struct sccb_header header;
523	u8 ccm;
524	u8 reserved[6];
525	u8 cssid;
526} __attribute__((packed));
527
528static 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	}
555out:
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 */
567int 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 */
579int sclp_chp_deconfigure(struct chp_id chpid)
580{
581	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
582}
583
584struct 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 */
602int 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);
626out:
627	free_page((unsigned long) sccb);
628	return rc;
629}
630