2 * Copyright IBM Corp. 2007,2012
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
5 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
8 #define KMSG_COMPONENT "sclp_cmd"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
19 #include <linux/mmzone.h>
20 #include <linux/memory.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <asm/ctl_reg.h>
24 #include <asm/chpid.h>
25 #include <asm/setup.h>
32 static void sclp_sync_callback(struct sclp_req *req, void *data)
34 struct completion *completion = data;
39 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
41 return sclp_sync_request_timeout(cmd, sccb, 0);
44 int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
46 struct completion completion;
47 struct sclp_req *request;
50 request = kzalloc(sizeof(*request), GFP_KERNEL);
54 request->queue_timeout = timeout;
55 request->command = cmd;
57 request->status = SCLP_REQ_FILLED;
58 request->callback = sclp_sync_callback;
59 request->callback_data = &completion;
60 init_completion(&completion);
62 /* Perform sclp request. */
63 rc = sclp_add_request(request);
66 wait_for_completion(&completion);
69 if (request->status != SCLP_REQ_DONE) {
70 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
71 cmd, request->status);
80 * CPU configuration related functions.
83 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
84 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
86 int _sclp_get_core_info(struct sclp_core_info *info)
89 struct read_cpu_info_sccb *sccb;
91 if (!SCLP_HAS_CPU_INFO)
93 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
96 sccb->header.length = sizeof(*sccb);
97 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
101 if (sccb->header.response_code != 0x0010) {
102 pr_warn("readcpuinfo failed (response=0x%04x)\n",
103 sccb->header.response_code);
107 sclp_fill_core_info(info, sccb);
109 free_page((unsigned long) sccb);
113 struct cpu_configure_sccb {
114 struct sccb_header header;
115 } __attribute__((packed, aligned(8)));
117 static int do_core_configure(sclp_cmdw_t cmd)
119 struct cpu_configure_sccb *sccb;
122 if (!SCLP_HAS_CPU_RECONFIG)
125 * This is not going to cross a page boundary since we force
126 * kmalloc to have a minimum alignment of 8 bytes on s390.
128 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
131 sccb->header.length = sizeof(*sccb);
132 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
135 switch (sccb->header.response_code) {
140 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
141 cmd, sccb->header.response_code);
150 int sclp_core_configure(u8 core)
152 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
155 int sclp_core_deconfigure(u8 core)
157 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
160 #ifdef CONFIG_MEMORY_HOTPLUG
162 static DEFINE_MUTEX(sclp_mem_mutex);
163 static LIST_HEAD(sclp_mem_list);
164 static u8 sclp_max_storage_id;
165 static DECLARE_BITMAP(sclp_storage_ids, 256);
166 static int sclp_mem_state_changed;
168 struct memory_increment {
169 struct list_head list;
174 struct assign_storage_sccb {
175 struct sccb_header header;
179 int arch_get_memory_phys_device(unsigned long start_pfn)
183 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
186 static unsigned long long rn2addr(u16 rn)
188 return (unsigned long long) (rn - 1) * sclp.rzm;
191 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
193 struct assign_storage_sccb *sccb;
196 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
199 sccb->header.length = PAGE_SIZE;
201 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
204 switch (sccb->header.response_code) {
209 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
210 cmd, sccb->header.response_code, rn);
215 free_page((unsigned long) sccb);
219 static int sclp_assign_storage(u16 rn)
221 unsigned long long start;
224 rc = do_assign_storage(0x000d0001, rn);
228 storage_key_init_range(start, start + sclp.rzm);
232 static int sclp_unassign_storage(u16 rn)
234 return do_assign_storage(0x000c0001, rn);
237 struct attach_storage_sccb {
238 struct sccb_header header;
245 static int sclp_attach_storage(u8 id)
247 struct attach_storage_sccb *sccb;
251 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
254 sccb->header.length = PAGE_SIZE;
255 sccb->header.function_code = 0x40;
256 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
257 SCLP_QUEUE_INTERVAL);
260 switch (sccb->header.response_code) {
262 set_bit(id, sclp_storage_ids);
263 for (i = 0; i < sccb->assigned; i++) {
264 if (sccb->entries[i])
265 sclp_unassign_storage(sccb->entries[i] >> 16);
273 free_page((unsigned long) sccb);
277 static int sclp_mem_change_state(unsigned long start, unsigned long size,
280 struct memory_increment *incr;
281 unsigned long long istart;
284 list_for_each_entry(incr, &sclp_mem_list, list) {
285 istart = rn2addr(incr->rn);
286 if (start + size - 1 < istart)
288 if (start > istart + sclp.rzm - 1)
291 rc |= sclp_assign_storage(incr->rn);
293 sclp_unassign_storage(incr->rn);
295 incr->standby = online ? 0 : 1;
297 return rc ? -EIO : 0;
300 static bool contains_standby_increment(unsigned long start, unsigned long end)
302 struct memory_increment *incr;
303 unsigned long istart;
305 list_for_each_entry(incr, &sclp_mem_list, list) {
306 istart = rn2addr(incr->rn);
307 if (end - 1 < istart)
309 if (start > istart + sclp.rzm - 1)
317 static int sclp_mem_notifier(struct notifier_block *nb,
318 unsigned long action, void *data)
320 unsigned long start, size;
321 struct memory_notify *arg;
326 start = arg->start_pfn << PAGE_SHIFT;
327 size = arg->nr_pages << PAGE_SHIFT;
328 mutex_lock(&sclp_mem_mutex);
329 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
330 sclp_attach_storage(id);
332 case MEM_GOING_OFFLINE:
334 * We do not allow to set memory blocks offline that contain
335 * standby memory. This is done to simplify the "memory online"
338 if (contains_standby_increment(start, start + size))
342 case MEM_CANCEL_OFFLINE:
344 case MEM_GOING_ONLINE:
345 rc = sclp_mem_change_state(start, size, 1);
347 case MEM_CANCEL_ONLINE:
348 sclp_mem_change_state(start, size, 0);
351 sclp_mem_change_state(start, size, 0);
358 sclp_mem_state_changed = 1;
359 mutex_unlock(&sclp_mem_mutex);
360 return rc ? NOTIFY_BAD : NOTIFY_OK;
363 static struct notifier_block sclp_mem_nb = {
364 .notifier_call = sclp_mem_notifier,
367 static void __init align_to_block_size(unsigned long long *start,
368 unsigned long long *size,
369 unsigned long long alignment)
371 unsigned long long start_align, size_align;
373 start_align = roundup(*start, alignment);
374 size_align = rounddown(*start + *size, alignment) - start_align;
376 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
377 *start, size_align >> 20, *size >> 20);
378 *start = start_align;
382 static void __init add_memory_merged(u16 rn)
384 unsigned long long start, size, addr, block_size;
385 static u16 first_rn, num;
387 if (rn && first_rn && (first_rn + num == rn)) {
393 start = rn2addr(first_rn);
394 size = (unsigned long long) num * sclp.rzm;
395 if (start >= VMEM_MAX_PHYS)
397 if (start + size > VMEM_MAX_PHYS)
398 size = VMEM_MAX_PHYS - start;
399 if (memory_end_set && (start >= memory_end))
401 if (memory_end_set && (start + size > memory_end))
402 size = memory_end - start;
403 block_size = memory_block_size_bytes();
404 align_to_block_size(&start, &size, block_size);
407 for (addr = start; addr < start + size; addr += block_size)
408 add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
414 static void __init sclp_add_standby_memory(void)
416 struct memory_increment *incr;
418 list_for_each_entry(incr, &sclp_mem_list, list)
420 add_memory_merged(incr->rn);
421 add_memory_merged(0);
424 static void __init insert_increment(u16 rn, int standby, int assigned)
426 struct memory_increment *incr, *new_incr;
427 struct list_head *prev;
430 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
434 new_incr->standby = standby;
436 prev = &sclp_mem_list;
437 list_for_each_entry(incr, &sclp_mem_list, list) {
438 if (assigned && incr->rn > rn)
440 if (!assigned && incr->rn - last_rn > 1)
446 new_incr->rn = last_rn + 1;
447 if (new_incr->rn > sclp.rnmax) {
451 list_add(&new_incr->list, prev);
454 static int sclp_mem_freeze(struct device *dev)
456 if (!sclp_mem_state_changed)
458 pr_err("Memory hotplug state changed, suspend refused.\n");
462 struct read_storage_sccb {
463 struct sccb_header header;
471 static const struct dev_pm_ops sclp_mem_pm_ops = {
472 .freeze = sclp_mem_freeze,
475 static struct platform_driver sclp_mem_pdrv = {
478 .pm = &sclp_mem_pm_ops,
482 static int __init sclp_detect_standby_memory(void)
484 struct platform_device *sclp_pdev;
485 struct read_storage_sccb *sccb;
486 int i, id, assigned, rc;
488 if (OLDMEM_BASE) /* No standby memory in kdump mode */
490 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
493 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
497 for (id = 0; id <= sclp_max_storage_id; id++) {
498 memset(sccb, 0, PAGE_SIZE);
499 sccb->header.length = PAGE_SIZE;
500 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
503 switch (sccb->header.response_code) {
505 set_bit(id, sclp_storage_ids);
506 for (i = 0; i < sccb->assigned; i++) {
507 if (!sccb->entries[i])
510 insert_increment(sccb->entries[i] >> 16, 0, 1);
516 for (i = 0; i < sccb->assigned; i++) {
517 if (!sccb->entries[i])
520 insert_increment(sccb->entries[i] >> 16, 1, 1);
528 sclp_max_storage_id = sccb->max_id;
530 if (rc || list_empty(&sclp_mem_list))
532 for (i = 1; i <= sclp.rnmax - assigned; i++)
533 insert_increment(0, 1, 0);
534 rc = register_memory_notifier(&sclp_mem_nb);
537 rc = platform_driver_register(&sclp_mem_pdrv);
540 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
541 rc = PTR_ERR_OR_ZERO(sclp_pdev);
544 sclp_add_standby_memory();
547 platform_driver_unregister(&sclp_mem_pdrv);
549 free_page((unsigned long) sccb);
552 __initcall(sclp_detect_standby_memory);
554 #endif /* CONFIG_MEMORY_HOTPLUG */
557 * Channel path configuration related functions.
560 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
561 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
562 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
564 struct chp_cfg_sccb {
565 struct sccb_header header;
569 } __attribute__((packed));
571 static int do_chp_configure(sclp_cmdw_t cmd)
573 struct chp_cfg_sccb *sccb;
576 if (!SCLP_HAS_CHP_RECONFIG)
579 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
582 sccb->header.length = sizeof(*sccb);
583 rc = sclp_sync_request(cmd, sccb);
586 switch (sccb->header.response_code) {
593 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
594 cmd, sccb->header.response_code);
599 free_page((unsigned long) sccb);
604 * sclp_chp_configure - perform configure channel-path sclp command
605 * @chpid: channel-path ID
607 * Perform configure channel-path command sclp command for specified chpid.
608 * Return 0 after command successfully finished, non-zero otherwise.
610 int sclp_chp_configure(struct chp_id chpid)
612 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
616 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
617 * @chpid: channel-path ID
619 * Perform deconfigure channel-path command sclp command for specified chpid
620 * and wait for completion. On success return 0. Return non-zero otherwise.
622 int sclp_chp_deconfigure(struct chp_id chpid)
624 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
627 struct chp_info_sccb {
628 struct sccb_header header;
629 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
630 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
631 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
635 } __attribute__((packed));
638 * sclp_chp_read_info - perform read channel-path information sclp command
639 * @info: resulting channel-path information data
641 * Perform read channel-path information sclp command and wait for completion.
642 * On success, store channel-path information in @info and return 0. Return
643 * non-zero otherwise.
645 int sclp_chp_read_info(struct sclp_chp_info *info)
647 struct chp_info_sccb *sccb;
650 if (!SCLP_HAS_CHP_INFO)
653 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
656 sccb->header.length = sizeof(*sccb);
657 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
660 if (sccb->header.response_code != 0x0010) {
661 pr_warn("read channel-path info failed (response=0x%04x)\n",
662 sccb->header.response_code);
666 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
667 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
668 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
670 free_page((unsigned long) sccb);