2 * Copyright IBM Corp. 2007, 2009
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/slab.h>
16 #include <linux/string.h>
18 #include <linux/mmzone.h>
19 #include <linux/memory.h>
20 #include <linux/platform_device.h>
21 #include <asm/chpid.h>
23 #include <asm/setup.h>
24 #include <asm/ctl_reg.h>
28 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
29 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
31 struct read_info_sccb {
32 struct sccb_header header; /* 0-7 */
35 u8 _reserved0[24 - 11]; /* 11-15 */
36 u8 loadparm[8]; /* 24-31 */
37 u8 _reserved1[48 - 32]; /* 32-47 */
38 u64 facilities; /* 48-55 */
39 u8 _reserved2[84 - 56]; /* 56-83 */
41 u8 _reserved3[91 - 85]; /* 85-90 */
43 u8 _reserved4[100 - 92]; /* 92-99 */
44 u32 rnsize2; /* 100-103 */
45 u64 rnmax2; /* 104-111 */
46 u8 _reserved5[4096 - 112]; /* 112-4095 */
47 } __attribute__((packed, aligned(PAGE_SIZE)));
49 static struct read_info_sccb __initdata early_read_info_sccb;
50 static int __initdata early_read_info_sccb_valid;
54 static unsigned long long rzm;
55 static unsigned long long rnmax;
57 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
62 rc = sclp_service_call(cmd, sccb);
65 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
66 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
69 /* Contents of the sccb might have changed. */
71 __ctl_clear_bit(0, 9);
75 static void __init sclp_read_info_early(void)
79 struct read_info_sccb *sccb;
80 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
81 SCLP_CMDW_READ_SCP_INFO};
83 sccb = &early_read_info_sccb;
84 for (i = 0; i < ARRAY_SIZE(commands); i++) {
86 memset(sccb, 0, sizeof(*sccb));
87 sccb->header.length = sizeof(*sccb);
88 sccb->header.function_code = 0x80;
89 sccb->header.control_mask[2] = 0x80;
90 rc = sclp_cmd_sync_early(commands[i], sccb);
91 } while (rc == -EBUSY);
95 if (sccb->header.response_code == 0x10) {
96 early_read_info_sccb_valid = 1;
99 if (sccb->header.response_code != 0x1f0)
104 void __init sclp_facilities_detect(void)
106 struct read_info_sccb *sccb;
108 sclp_read_info_early();
109 if (!early_read_info_sccb_valid)
112 sccb = &early_read_info_sccb;
113 sclp_facilities = sccb->facilities;
114 sclp_fac84 = sccb->fac84;
115 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
116 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
120 unsigned long long sclp_get_rnmax(void)
125 unsigned long long sclp_get_rzm(void)
131 * This function will be called after sclp_facilities_detect(), which gets
132 * called from early.c code. Therefore the sccb should have valid contents.
134 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
136 struct read_info_sccb *sccb;
138 if (!early_read_info_sccb_valid)
140 sccb = &early_read_info_sccb;
142 if (sccb->flags & 0x2)
144 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
147 static void sclp_sync_callback(struct sclp_req *req, void *data)
149 struct completion *completion = data;
151 complete(completion);
154 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
156 struct completion completion;
157 struct sclp_req *request;
160 request = kzalloc(sizeof(*request), GFP_KERNEL);
163 request->command = cmd;
164 request->sccb = sccb;
165 request->status = SCLP_REQ_FILLED;
166 request->callback = sclp_sync_callback;
167 request->callback_data = &completion;
168 init_completion(&completion);
170 /* Perform sclp request. */
171 rc = sclp_add_request(request);
174 wait_for_completion(&completion);
176 /* Check response. */
177 if (request->status != SCLP_REQ_DONE) {
178 pr_warning("sync request failed (cmd=0x%08x, "
179 "status=0x%02x)\n", cmd, request->status);
188 * CPU configuration related functions.
191 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
192 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
193 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
195 struct read_cpu_info_sccb {
196 struct sccb_header header;
198 u16 offset_configured;
201 u8 reserved[4096 - 16];
202 } __attribute__((packed, aligned(PAGE_SIZE)));
204 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
205 struct read_cpu_info_sccb *sccb)
207 char *page = (char *) sccb;
209 memset(info, 0, sizeof(*info));
210 info->configured = sccb->nr_configured;
211 info->standby = sccb->nr_standby;
212 info->combined = sccb->nr_configured + sccb->nr_standby;
213 info->has_cpu_type = sclp_fac84 & 0x1;
214 memcpy(&info->cpu, page + sccb->offset_configured,
215 info->combined * sizeof(struct sclp_cpu_entry));
218 int sclp_get_cpu_info(struct sclp_cpu_info *info)
221 struct read_cpu_info_sccb *sccb;
223 if (!SCLP_HAS_CPU_INFO)
225 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
228 sccb->header.length = sizeof(*sccb);
229 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
232 if (sccb->header.response_code != 0x0010) {
233 pr_warning("readcpuinfo failed (response=0x%04x)\n",
234 sccb->header.response_code);
238 sclp_fill_cpu_info(info, sccb);
240 free_page((unsigned long) sccb);
244 struct cpu_configure_sccb {
245 struct sccb_header header;
246 } __attribute__((packed, aligned(8)));
248 static int do_cpu_configure(sclp_cmdw_t cmd)
250 struct cpu_configure_sccb *sccb;
253 if (!SCLP_HAS_CPU_RECONFIG)
256 * This is not going to cross a page boundary since we force
257 * kmalloc to have a minimum alignment of 8 bytes on s390.
259 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
262 sccb->header.length = sizeof(*sccb);
263 rc = do_sync_request(cmd, sccb);
266 switch (sccb->header.response_code) {
271 pr_warning("configure cpu failed (cmd=0x%08x, "
272 "response=0x%04x)\n", cmd,
273 sccb->header.response_code);
282 int sclp_cpu_configure(u8 cpu)
284 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
287 int sclp_cpu_deconfigure(u8 cpu)
289 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
292 #ifdef CONFIG_MEMORY_HOTPLUG
294 static DEFINE_MUTEX(sclp_mem_mutex);
295 static LIST_HEAD(sclp_mem_list);
296 static u8 sclp_max_storage_id;
297 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
298 static int sclp_mem_state_changed;
300 struct memory_increment {
301 struct list_head list;
307 struct assign_storage_sccb {
308 struct sccb_header header;
312 int arch_get_memory_phys_device(unsigned long start_pfn)
316 return PFN_PHYS(start_pfn) >> ilog2(rzm);
319 static unsigned long long rn2addr(u16 rn)
321 return (unsigned long long) (rn - 1) * rzm;
324 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
326 struct assign_storage_sccb *sccb;
329 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
332 sccb->header.length = PAGE_SIZE;
334 rc = do_sync_request(cmd, sccb);
337 switch (sccb->header.response_code) {
342 pr_warning("assign storage failed (cmd=0x%08x, "
343 "response=0x%04x, rn=0x%04x)\n", cmd,
344 sccb->header.response_code, rn);
349 free_page((unsigned long) sccb);
353 static int sclp_assign_storage(u16 rn)
355 return do_assign_storage(0x000d0001, rn);
358 static int sclp_unassign_storage(u16 rn)
360 return do_assign_storage(0x000c0001, rn);
363 struct attach_storage_sccb {
364 struct sccb_header header;
371 static int sclp_attach_storage(u8 id)
373 struct attach_storage_sccb *sccb;
377 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
380 sccb->header.length = PAGE_SIZE;
381 rc = do_sync_request(0x00080001 | id << 8, sccb);
384 switch (sccb->header.response_code) {
386 set_bit(id, sclp_storage_ids);
387 for (i = 0; i < sccb->assigned; i++) {
388 if (sccb->entries[i])
389 sclp_unassign_storage(sccb->entries[i] >> 16);
397 free_page((unsigned long) sccb);
401 static int sclp_mem_change_state(unsigned long start, unsigned long size,
404 struct memory_increment *incr;
405 unsigned long long istart;
408 list_for_each_entry(incr, &sclp_mem_list, list) {
409 istart = rn2addr(incr->rn);
410 if (start + size - 1 < istart)
412 if (start > istart + rzm - 1)
415 if (incr->usecount++)
418 * Don't break the loop if one assign fails. Loop may
419 * be walked again on CANCEL and we can't save
420 * information if state changed before or not.
421 * So continue and increase usecount for all increments.
423 rc |= sclp_assign_storage(incr->rn);
425 if (--incr->usecount)
427 sclp_unassign_storage(incr->rn);
430 return rc ? -EIO : 0;
433 static int sclp_mem_notifier(struct notifier_block *nb,
434 unsigned long action, void *data)
436 unsigned long start, size;
437 struct memory_notify *arg;
442 start = arg->start_pfn << PAGE_SHIFT;
443 size = arg->nr_pages << PAGE_SHIFT;
444 mutex_lock(&sclp_mem_mutex);
445 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
446 sclp_attach_storage(id);
449 case MEM_GOING_OFFLINE:
450 case MEM_CANCEL_OFFLINE:
452 case MEM_GOING_ONLINE:
453 rc = sclp_mem_change_state(start, size, 1);
455 case MEM_CANCEL_ONLINE:
456 sclp_mem_change_state(start, size, 0);
459 sclp_mem_change_state(start, size, 0);
466 sclp_mem_state_changed = 1;
467 mutex_unlock(&sclp_mem_mutex);
468 return rc ? NOTIFY_BAD : NOTIFY_OK;
471 static struct notifier_block sclp_mem_nb = {
472 .notifier_call = sclp_mem_notifier,
475 static void __init add_memory_merged(u16 rn)
477 static u16 first_rn, num;
478 unsigned long long start, size;
480 if (rn && first_rn && (first_rn + num == rn)) {
486 start = rn2addr(first_rn);
487 size = (unsigned long long ) num * rzm;
488 if (start >= VMEM_MAX_PHYS)
490 if (start + size > VMEM_MAX_PHYS)
491 size = VMEM_MAX_PHYS - start;
492 if (memory_end_set && (start >= memory_end))
494 if (memory_end_set && (start + size > memory_end))
495 size = memory_end - start;
496 add_memory(0, start, size);
502 static void __init sclp_add_standby_memory(void)
504 struct memory_increment *incr;
506 list_for_each_entry(incr, &sclp_mem_list, list)
508 add_memory_merged(incr->rn);
509 add_memory_merged(0);
512 static void __init insert_increment(u16 rn, int standby, int assigned)
514 struct memory_increment *incr, *new_incr;
515 struct list_head *prev;
518 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
522 new_incr->standby = standby;
524 new_incr->usecount = 1;
526 prev = &sclp_mem_list;
527 list_for_each_entry(incr, &sclp_mem_list, list) {
528 if (assigned && incr->rn > rn)
530 if (!assigned && incr->rn - last_rn > 1)
536 new_incr->rn = last_rn + 1;
537 if (new_incr->rn > rnmax) {
541 list_add(&new_incr->list, prev);
544 static int sclp_mem_freeze(struct device *dev)
546 if (!sclp_mem_state_changed)
548 pr_err("Memory hotplug state changed, suspend refused.\n");
552 struct read_storage_sccb {
553 struct sccb_header header;
561 static const struct dev_pm_ops sclp_mem_pm_ops = {
562 .freeze = sclp_mem_freeze,
565 static struct platform_driver sclp_mem_pdrv = {
568 .pm = &sclp_mem_pm_ops,
572 static int __init sclp_detect_standby_memory(void)
574 struct platform_device *sclp_pdev;
575 struct read_storage_sccb *sccb;
576 int i, id, assigned, rc;
578 if (!early_read_info_sccb_valid)
580 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
583 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
587 for (id = 0; id <= sclp_max_storage_id; id++) {
588 memset(sccb, 0, PAGE_SIZE);
589 sccb->header.length = PAGE_SIZE;
590 rc = do_sync_request(0x00040001 | id << 8, sccb);
593 switch (sccb->header.response_code) {
595 set_bit(id, sclp_storage_ids);
596 for (i = 0; i < sccb->assigned; i++) {
597 if (!sccb->entries[i])
600 insert_increment(sccb->entries[i] >> 16, 0, 1);
606 for (i = 0; i < sccb->assigned; i++) {
607 if (!sccb->entries[i])
610 insert_increment(sccb->entries[i] >> 16, 1, 1);
618 sclp_max_storage_id = sccb->max_id;
620 if (rc || list_empty(&sclp_mem_list))
622 for (i = 1; i <= rnmax - assigned; i++)
623 insert_increment(0, 1, 0);
624 rc = register_memory_notifier(&sclp_mem_nb);
627 rc = platform_driver_register(&sclp_mem_pdrv);
630 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
631 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
634 sclp_add_standby_memory();
637 platform_driver_unregister(&sclp_mem_pdrv);
639 free_page((unsigned long) sccb);
642 __initcall(sclp_detect_standby_memory);
644 #endif /* CONFIG_MEMORY_HOTPLUG */
647 * Channel path configuration related functions.
650 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
651 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
652 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
654 struct chp_cfg_sccb {
655 struct sccb_header header;
659 } __attribute__((packed));
661 static int do_chp_configure(sclp_cmdw_t cmd)
663 struct chp_cfg_sccb *sccb;
666 if (!SCLP_HAS_CHP_RECONFIG)
669 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
672 sccb->header.length = sizeof(*sccb);
673 rc = do_sync_request(cmd, sccb);
676 switch (sccb->header.response_code) {
683 pr_warning("configure channel-path failed "
684 "(cmd=0x%08x, response=0x%04x)\n", cmd,
685 sccb->header.response_code);
690 free_page((unsigned long) sccb);
695 * sclp_chp_configure - perform configure channel-path sclp command
696 * @chpid: channel-path ID
698 * Perform configure channel-path command sclp command for specified chpid.
699 * Return 0 after command successfully finished, non-zero otherwise.
701 int sclp_chp_configure(struct chp_id chpid)
703 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
707 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
708 * @chpid: channel-path ID
710 * Perform deconfigure channel-path command sclp command for specified chpid
711 * and wait for completion. On success return 0. Return non-zero otherwise.
713 int sclp_chp_deconfigure(struct chp_id chpid)
715 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
718 struct chp_info_sccb {
719 struct sccb_header header;
720 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
721 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
722 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
726 } __attribute__((packed));
729 * sclp_chp_read_info - perform read channel-path information sclp command
730 * @info: resulting channel-path information data
732 * Perform read channel-path information sclp command and wait for completion.
733 * On success, store channel-path information in @info and return 0. Return
734 * non-zero otherwise.
736 int sclp_chp_read_info(struct sclp_chp_info *info)
738 struct chp_info_sccb *sccb;
741 if (!SCLP_HAS_CHP_INFO)
744 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
747 sccb->header.length = sizeof(*sccb);
748 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
751 if (sccb->header.response_code != 0x0010) {
752 pr_warning("read channel-path info failed "
753 "(response=0x%04x)\n", sccb->header.response_code);
757 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
758 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
759 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
761 free_page((unsigned long) sccb);