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>
31 static void sclp_sync_callback(struct sclp_req *req, void *data)
33 struct completion *completion = data;
38 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
40 return sclp_sync_request_timeout(cmd, sccb, 0);
43 int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
45 struct completion completion;
46 struct sclp_req *request;
49 request = kzalloc(sizeof(*request), GFP_KERNEL);
53 request->queue_timeout = timeout;
54 request->command = cmd;
56 request->status = SCLP_REQ_FILLED;
57 request->callback = sclp_sync_callback;
58 request->callback_data = &completion;
59 init_completion(&completion);
61 /* Perform sclp request. */
62 rc = sclp_add_request(request);
65 wait_for_completion(&completion);
68 if (request->status != SCLP_REQ_DONE) {
69 pr_warning("sync request failed (cmd=0x%08x, "
70 "status=0x%02x)\n", cmd, request->status);
79 * CPU configuration related functions.
82 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
83 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
84 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
86 struct read_cpu_info_sccb {
87 struct sccb_header header;
89 u16 offset_configured;
92 u8 reserved[4096 - 16];
93 } __attribute__((packed, aligned(PAGE_SIZE)));
95 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
96 struct read_cpu_info_sccb *sccb)
98 char *page = (char *) sccb;
100 memset(info, 0, sizeof(*info));
101 info->configured = sccb->nr_configured;
102 info->standby = sccb->nr_standby;
103 info->combined = sccb->nr_configured + sccb->nr_standby;
104 info->has_cpu_type = sclp_fac84 & 0x1;
105 memcpy(&info->cpu, page + sccb->offset_configured,
106 info->combined * sizeof(struct sclp_cpu_entry));
109 int sclp_get_cpu_info(struct sclp_cpu_info *info)
112 struct read_cpu_info_sccb *sccb;
114 if (!SCLP_HAS_CPU_INFO)
116 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
119 sccb->header.length = sizeof(*sccb);
120 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
121 SCLP_QUEUE_INTERVAL);
124 if (sccb->header.response_code != 0x0010) {
125 pr_warning("readcpuinfo failed (response=0x%04x)\n",
126 sccb->header.response_code);
130 sclp_fill_cpu_info(info, sccb);
132 free_page((unsigned long) sccb);
136 struct cpu_configure_sccb {
137 struct sccb_header header;
138 } __attribute__((packed, aligned(8)));
140 static int do_cpu_configure(sclp_cmdw_t cmd)
142 struct cpu_configure_sccb *sccb;
145 if (!SCLP_HAS_CPU_RECONFIG)
148 * This is not going to cross a page boundary since we force
149 * kmalloc to have a minimum alignment of 8 bytes on s390.
151 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
154 sccb->header.length = sizeof(*sccb);
155 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
158 switch (sccb->header.response_code) {
163 pr_warning("configure cpu failed (cmd=0x%08x, "
164 "response=0x%04x)\n", cmd,
165 sccb->header.response_code);
174 int sclp_cpu_configure(u8 cpu)
176 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
179 int sclp_cpu_deconfigure(u8 cpu)
181 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
184 #ifdef CONFIG_MEMORY_HOTPLUG
186 static DEFINE_MUTEX(sclp_mem_mutex);
187 static LIST_HEAD(sclp_mem_list);
188 static u8 sclp_max_storage_id;
189 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
190 static int sclp_mem_state_changed;
192 struct memory_increment {
193 struct list_head list;
198 struct assign_storage_sccb {
199 struct sccb_header header;
203 int arch_get_memory_phys_device(unsigned long start_pfn)
207 return PFN_PHYS(start_pfn) >> ilog2(sclp_rzm);
210 static unsigned long long rn2addr(u16 rn)
212 return (unsigned long long) (rn - 1) * sclp_rzm;
215 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
217 struct assign_storage_sccb *sccb;
220 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
223 sccb->header.length = PAGE_SIZE;
225 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
228 switch (sccb->header.response_code) {
233 pr_warning("assign storage failed (cmd=0x%08x, "
234 "response=0x%04x, rn=0x%04x)\n", cmd,
235 sccb->header.response_code, rn);
240 free_page((unsigned long) sccb);
244 static int sclp_assign_storage(u16 rn)
246 unsigned long long start;
249 rc = do_assign_storage(0x000d0001, rn);
253 storage_key_init_range(start, start + sclp_rzm);
257 static int sclp_unassign_storage(u16 rn)
259 return do_assign_storage(0x000c0001, rn);
262 struct attach_storage_sccb {
263 struct sccb_header header;
270 static int sclp_attach_storage(u8 id)
272 struct attach_storage_sccb *sccb;
276 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
279 sccb->header.length = PAGE_SIZE;
280 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
281 SCLP_QUEUE_INTERVAL);
284 switch (sccb->header.response_code) {
286 set_bit(id, sclp_storage_ids);
287 for (i = 0; i < sccb->assigned; i++) {
288 if (sccb->entries[i])
289 sclp_unassign_storage(sccb->entries[i] >> 16);
297 free_page((unsigned long) sccb);
301 static int sclp_mem_change_state(unsigned long start, unsigned long size,
304 struct memory_increment *incr;
305 unsigned long long istart;
308 list_for_each_entry(incr, &sclp_mem_list, list) {
309 istart = rn2addr(incr->rn);
310 if (start + size - 1 < istart)
312 if (start > istart + sclp_rzm - 1)
315 rc |= sclp_assign_storage(incr->rn);
317 sclp_unassign_storage(incr->rn);
319 return rc ? -EIO : 0;
322 static int sclp_mem_notifier(struct notifier_block *nb,
323 unsigned long action, void *data)
325 unsigned long start, size;
326 struct memory_notify *arg;
331 start = arg->start_pfn << PAGE_SHIFT;
332 size = arg->nr_pages << PAGE_SHIFT;
333 mutex_lock(&sclp_mem_mutex);
334 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
335 sclp_attach_storage(id);
338 case MEM_GOING_OFFLINE:
339 case MEM_CANCEL_OFFLINE:
341 case MEM_GOING_ONLINE:
342 rc = sclp_mem_change_state(start, size, 1);
344 case MEM_CANCEL_ONLINE:
345 sclp_mem_change_state(start, size, 0);
348 sclp_mem_change_state(start, size, 0);
355 sclp_mem_state_changed = 1;
356 mutex_unlock(&sclp_mem_mutex);
357 return rc ? NOTIFY_BAD : NOTIFY_OK;
360 static struct notifier_block sclp_mem_nb = {
361 .notifier_call = sclp_mem_notifier,
364 static void __init add_memory_merged(u16 rn)
366 static u16 first_rn, num;
367 unsigned long long start, size;
369 if (rn && first_rn && (first_rn + num == rn)) {
375 start = rn2addr(first_rn);
376 size = (unsigned long long) num * sclp_rzm;
377 if (start >= VMEM_MAX_PHYS)
379 if (start + size > VMEM_MAX_PHYS)
380 size = VMEM_MAX_PHYS - start;
381 if (memory_end_set && (start >= memory_end))
383 if (memory_end_set && (start + size > memory_end))
384 size = memory_end - start;
385 add_memory(0, start, size);
391 static void __init sclp_add_standby_memory(void)
393 struct memory_increment *incr;
395 list_for_each_entry(incr, &sclp_mem_list, list)
397 add_memory_merged(incr->rn);
398 add_memory_merged(0);
401 static void __init insert_increment(u16 rn, int standby, int assigned)
403 struct memory_increment *incr, *new_incr;
404 struct list_head *prev;
407 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
411 new_incr->standby = standby;
413 prev = &sclp_mem_list;
414 list_for_each_entry(incr, &sclp_mem_list, list) {
415 if (assigned && incr->rn > rn)
417 if (!assigned && incr->rn - last_rn > 1)
423 new_incr->rn = last_rn + 1;
424 if (new_incr->rn > sclp_rnmax) {
428 list_add(&new_incr->list, prev);
431 static int sclp_mem_freeze(struct device *dev)
433 if (!sclp_mem_state_changed)
435 pr_err("Memory hotplug state changed, suspend refused.\n");
439 struct read_storage_sccb {
440 struct sccb_header header;
448 static const struct dev_pm_ops sclp_mem_pm_ops = {
449 .freeze = sclp_mem_freeze,
452 static struct platform_driver sclp_mem_pdrv = {
455 .pm = &sclp_mem_pm_ops,
459 static int __init sclp_detect_standby_memory(void)
461 struct platform_device *sclp_pdev;
462 struct read_storage_sccb *sccb;
463 int i, id, assigned, rc;
465 if (OLDMEM_BASE) /* No standby memory in kdump mode */
467 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
470 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
474 for (id = 0; id <= sclp_max_storage_id; id++) {
475 memset(sccb, 0, PAGE_SIZE);
476 sccb->header.length = PAGE_SIZE;
477 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
480 switch (sccb->header.response_code) {
482 set_bit(id, sclp_storage_ids);
483 for (i = 0; i < sccb->assigned; i++) {
484 if (!sccb->entries[i])
487 insert_increment(sccb->entries[i] >> 16, 0, 1);
493 for (i = 0; i < sccb->assigned; i++) {
494 if (!sccb->entries[i])
497 insert_increment(sccb->entries[i] >> 16, 1, 1);
505 sclp_max_storage_id = sccb->max_id;
507 if (rc || list_empty(&sclp_mem_list))
509 for (i = 1; i <= sclp_rnmax - assigned; i++)
510 insert_increment(0, 1, 0);
511 rc = register_memory_notifier(&sclp_mem_nb);
514 rc = platform_driver_register(&sclp_mem_pdrv);
517 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
518 rc = PTR_RET(sclp_pdev);
521 sclp_add_standby_memory();
524 platform_driver_unregister(&sclp_mem_pdrv);
526 free_page((unsigned long) sccb);
529 __initcall(sclp_detect_standby_memory);
531 #endif /* CONFIG_MEMORY_HOTPLUG */
534 * PCI I/O adapter configuration related functions.
536 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
537 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
539 #define SCLP_RECONFIG_PCI_ATPYE 2
541 struct pci_cfg_sccb {
542 struct sccb_header header;
543 u8 atype; /* adapter type */
546 u32 aid; /* adapter identifier */
549 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
551 struct pci_cfg_sccb *sccb;
554 if (!SCLP_HAS_PCI_RECONFIG)
557 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
561 sccb->header.length = PAGE_SIZE;
562 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
564 rc = sclp_sync_request(cmd, sccb);
567 switch (sccb->header.response_code) {
572 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
573 cmd, sccb->header.response_code);
578 free_page((unsigned long) sccb);
582 int sclp_pci_configure(u32 fid)
584 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
586 EXPORT_SYMBOL(sclp_pci_configure);
588 int sclp_pci_deconfigure(u32 fid)
590 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
592 EXPORT_SYMBOL(sclp_pci_deconfigure);
595 * Channel path configuration related functions.
598 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
599 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
600 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
602 struct chp_cfg_sccb {
603 struct sccb_header header;
607 } __attribute__((packed));
609 static int do_chp_configure(sclp_cmdw_t cmd)
611 struct chp_cfg_sccb *sccb;
614 if (!SCLP_HAS_CHP_RECONFIG)
617 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
620 sccb->header.length = sizeof(*sccb);
621 rc = sclp_sync_request(cmd, sccb);
624 switch (sccb->header.response_code) {
631 pr_warning("configure channel-path failed "
632 "(cmd=0x%08x, response=0x%04x)\n", cmd,
633 sccb->header.response_code);
638 free_page((unsigned long) sccb);
643 * sclp_chp_configure - perform configure channel-path sclp command
644 * @chpid: channel-path ID
646 * Perform configure channel-path command sclp command for specified chpid.
647 * Return 0 after command successfully finished, non-zero otherwise.
649 int sclp_chp_configure(struct chp_id chpid)
651 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
655 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
656 * @chpid: channel-path ID
658 * Perform deconfigure channel-path command sclp command for specified chpid
659 * and wait for completion. On success return 0. Return non-zero otherwise.
661 int sclp_chp_deconfigure(struct chp_id chpid)
663 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
666 struct chp_info_sccb {
667 struct sccb_header header;
668 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
669 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
670 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
674 } __attribute__((packed));
677 * sclp_chp_read_info - perform read channel-path information sclp command
678 * @info: resulting channel-path information data
680 * Perform read channel-path information sclp command and wait for completion.
681 * On success, store channel-path information in @info and return 0. Return
682 * non-zero otherwise.
684 int sclp_chp_read_info(struct sclp_chp_info *info)
686 struct chp_info_sccb *sccb;
689 if (!SCLP_HAS_CHP_INFO)
692 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
695 sccb->header.length = sizeof(*sccb);
696 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
699 if (sccb->header.response_code != 0x0010) {
700 pr_warning("read channel-path info failed "
701 "(response=0x%04x)\n", sccb->header.response_code);
705 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
706 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
707 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
709 free_page((unsigned long) sccb);
713 bool sclp_has_sprp(void)
715 return !!(sclp_fac84 & 0x2);