2 * drivers/s390/char/sclp_cmd.c
4 * Copyright IBM Corp. 2007
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
6 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
9 #include <linux/completion.h>
10 #include <linux/init.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/string.h>
15 #include <linux/mmzone.h>
16 #include <linux/memory.h>
17 #include <asm/chpid.h>
21 #define TAG "sclp_cmd: "
23 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
24 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
26 struct read_info_sccb {
27 struct sccb_header header; /* 0-7 */
30 u8 _reserved0[24 - 11]; /* 11-15 */
31 u8 loadparm[8]; /* 24-31 */
32 u8 _reserved1[48 - 32]; /* 32-47 */
33 u64 facilities; /* 48-55 */
34 u8 _reserved2[84 - 56]; /* 56-83 */
36 u8 _reserved3[91 - 85]; /* 85-90 */
38 u8 _reserved4[100 - 92]; /* 92-99 */
39 u32 rnsize2; /* 100-103 */
40 u64 rnmax2; /* 104-111 */
41 u8 _reserved5[4096 - 112]; /* 112-4095 */
42 } __attribute__((packed, aligned(PAGE_SIZE)));
44 static struct read_info_sccb __initdata early_read_info_sccb;
45 static int __initdata early_read_info_sccb_valid;
49 static unsigned long long rzm;
50 static unsigned long long rnmax;
52 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
57 rc = sclp_service_call(cmd, sccb);
60 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
61 PSW_MASK_WAIT | PSW_DEFAULT_KEY);
64 /* Contents of the sccb might have changed. */
66 __ctl_clear_bit(0, 9);
70 static void __init sclp_read_info_early(void)
74 struct read_info_sccb *sccb;
75 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
76 SCLP_CMDW_READ_SCP_INFO};
78 sccb = &early_read_info_sccb;
79 for (i = 0; i < ARRAY_SIZE(commands); i++) {
81 memset(sccb, 0, sizeof(*sccb));
82 sccb->header.length = sizeof(*sccb);
83 sccb->header.control_mask[2] = 0x80;
84 rc = sclp_cmd_sync_early(commands[i], sccb);
85 } while (rc == -EBUSY);
89 if (sccb->header.response_code == 0x10) {
90 early_read_info_sccb_valid = 1;
93 if (sccb->header.response_code != 0x1f0)
98 void __init sclp_facilities_detect(void)
100 struct read_info_sccb *sccb;
102 sclp_read_info_early();
103 if (!early_read_info_sccb_valid)
106 sccb = &early_read_info_sccb;
107 sclp_facilities = sccb->facilities;
108 sclp_fac84 = sccb->fac84;
109 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
110 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
114 unsigned long long sclp_get_rnmax(void)
119 unsigned long long sclp_get_rzm(void)
125 * This function will be called after sclp_facilities_detect(), which gets
126 * called from early.c code. Therefore the sccb should have valid contents.
128 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
130 struct read_info_sccb *sccb;
132 if (!early_read_info_sccb_valid)
134 sccb = &early_read_info_sccb;
136 if (sccb->flags & 0x2)
138 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
141 static void sclp_sync_callback(struct sclp_req *req, void *data)
143 struct completion *completion = data;
145 complete(completion);
148 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
150 struct completion completion;
151 struct sclp_req *request;
154 request = kzalloc(sizeof(*request), GFP_KERNEL);
157 request->command = cmd;
158 request->sccb = sccb;
159 request->status = SCLP_REQ_FILLED;
160 request->callback = sclp_sync_callback;
161 request->callback_data = &completion;
162 init_completion(&completion);
164 /* Perform sclp request. */
165 rc = sclp_add_request(request);
168 wait_for_completion(&completion);
170 /* Check response. */
171 if (request->status != SCLP_REQ_DONE) {
172 printk(KERN_WARNING TAG "sync request failed "
173 "(cmd=0x%08x, status=0x%02x)\n", cmd, request->status);
182 * CPU configuration related functions.
185 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
186 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
187 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
189 struct read_cpu_info_sccb {
190 struct sccb_header header;
192 u16 offset_configured;
195 u8 reserved[4096 - 16];
196 } __attribute__((packed, aligned(PAGE_SIZE)));
198 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
199 struct read_cpu_info_sccb *sccb)
201 char *page = (char *) sccb;
203 memset(info, 0, sizeof(*info));
204 info->configured = sccb->nr_configured;
205 info->standby = sccb->nr_standby;
206 info->combined = sccb->nr_configured + sccb->nr_standby;
207 info->has_cpu_type = sclp_fac84 & 0x1;
208 memcpy(&info->cpu, page + sccb->offset_configured,
209 info->combined * sizeof(struct sclp_cpu_entry));
212 int sclp_get_cpu_info(struct sclp_cpu_info *info)
215 struct read_cpu_info_sccb *sccb;
217 if (!SCLP_HAS_CPU_INFO)
219 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
222 sccb->header.length = sizeof(*sccb);
223 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
226 if (sccb->header.response_code != 0x0010) {
227 printk(KERN_WARNING TAG "readcpuinfo failed "
228 "(response=0x%04x)\n", sccb->header.response_code);
232 sclp_fill_cpu_info(info, sccb);
234 free_page((unsigned long) sccb);
238 struct cpu_configure_sccb {
239 struct sccb_header header;
240 } __attribute__((packed, aligned(8)));
242 static int do_cpu_configure(sclp_cmdw_t cmd)
244 struct cpu_configure_sccb *sccb;
247 if (!SCLP_HAS_CPU_RECONFIG)
250 * This is not going to cross a page boundary since we force
251 * kmalloc to have a minimum alignment of 8 bytes on s390.
253 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
256 sccb->header.length = sizeof(*sccb);
257 rc = do_sync_request(cmd, sccb);
260 switch (sccb->header.response_code) {
265 printk(KERN_WARNING TAG "configure cpu failed (cmd=0x%08x, "
266 "response=0x%04x)\n", cmd, sccb->header.response_code);
275 int sclp_cpu_configure(u8 cpu)
277 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
280 int sclp_cpu_deconfigure(u8 cpu)
282 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
285 #ifdef CONFIG_MEMORY_HOTPLUG
287 static DEFINE_MUTEX(sclp_mem_mutex);
288 static LIST_HEAD(sclp_mem_list);
289 static u8 sclp_max_storage_id;
290 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
292 struct memory_increment {
293 struct list_head list;
299 struct assign_storage_sccb {
300 struct sccb_header header;
304 static unsigned long long rn2addr(u16 rn)
306 return (unsigned long long) (rn - 1) * rzm;
309 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
311 struct assign_storage_sccb *sccb;
314 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
317 sccb->header.length = PAGE_SIZE;
319 rc = do_sync_request(cmd, sccb);
322 switch (sccb->header.response_code) {
327 pr_warning("assign storage failed (cmd=0x%08x, "
328 "response=0x%04x, rn=0x%04x)\n", cmd,
329 sccb->header.response_code, rn);
334 free_page((unsigned long) sccb);
338 static int sclp_assign_storage(u16 rn)
340 return do_assign_storage(0x000d0001, rn);
343 static int sclp_unassign_storage(u16 rn)
345 return do_assign_storage(0x000c0001, rn);
348 struct attach_storage_sccb {
349 struct sccb_header header;
356 static int sclp_attach_storage(u8 id)
358 struct attach_storage_sccb *sccb;
362 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
365 sccb->header.length = PAGE_SIZE;
366 rc = do_sync_request(0x00080001 | id << 8, sccb);
369 switch (sccb->header.response_code) {
371 set_bit(id, sclp_storage_ids);
372 for (i = 0; i < sccb->assigned; i++)
373 sclp_unassign_storage(sccb->entries[i] >> 16);
380 free_page((unsigned long) sccb);
384 static int sclp_mem_change_state(unsigned long start, unsigned long size,
387 struct memory_increment *incr;
388 unsigned long long istart;
391 list_for_each_entry(incr, &sclp_mem_list, list) {
392 istart = rn2addr(incr->rn);
393 if (start + size - 1 < istart)
395 if (start > istart + rzm - 1)
398 if (incr->usecount++)
401 * Don't break the loop if one assign fails. Loop may
402 * be walked again on CANCEL and we can't save
403 * information if state changed before or not.
404 * So continue and increase usecount for all increments.
406 rc |= sclp_assign_storage(incr->rn);
408 if (--incr->usecount)
410 sclp_unassign_storage(incr->rn);
413 return rc ? -EIO : 0;
416 static int sclp_mem_notifier(struct notifier_block *nb,
417 unsigned long action, void *data)
419 unsigned long start, size;
420 struct memory_notify *arg;
425 start = arg->start_pfn << PAGE_SHIFT;
426 size = arg->nr_pages << PAGE_SHIFT;
427 mutex_lock(&sclp_mem_mutex);
428 for (id = 0; id <= sclp_max_storage_id; id++)
429 if (!test_bit(id, sclp_storage_ids))
430 sclp_attach_storage(id);
433 case MEM_GOING_OFFLINE:
434 case MEM_CANCEL_OFFLINE:
436 case MEM_GOING_ONLINE:
437 rc = sclp_mem_change_state(start, size, 1);
439 case MEM_CANCEL_ONLINE:
440 sclp_mem_change_state(start, size, 0);
443 sclp_mem_change_state(start, size, 0);
449 mutex_unlock(&sclp_mem_mutex);
450 return rc ? NOTIFY_BAD : NOTIFY_OK;
453 static struct notifier_block sclp_mem_nb = {
454 .notifier_call = sclp_mem_notifier,
457 static void __init add_memory_merged(u16 rn)
459 static u16 first_rn, num;
460 unsigned long long start, size;
462 if (rn && first_rn && (first_rn + num == rn)) {
468 start = rn2addr(first_rn);
469 size = (unsigned long long ) num * rzm;
470 if (start >= VMEM_MAX_PHYS)
472 if (start + size > VMEM_MAX_PHYS)
473 size = VMEM_MAX_PHYS - start;
474 add_memory(0, start, size);
480 static void __init sclp_add_standby_memory(void)
482 struct memory_increment *incr;
484 list_for_each_entry(incr, &sclp_mem_list, list)
486 add_memory_merged(incr->rn);
487 add_memory_merged(0);
490 static void __init insert_increment(u16 rn, int standby, int assigned)
492 struct memory_increment *incr, *new_incr;
493 struct list_head *prev;
496 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
500 new_incr->standby = standby;
502 prev = &sclp_mem_list;
503 list_for_each_entry(incr, &sclp_mem_list, list) {
504 if (assigned && incr->rn > rn)
506 if (!assigned && incr->rn - last_rn > 1)
512 new_incr->rn = last_rn + 1;
513 if (new_incr->rn > rnmax) {
517 list_add(&new_incr->list, prev);
520 struct read_storage_sccb {
521 struct sccb_header header;
529 static int __init sclp_detect_standby_memory(void)
531 struct read_storage_sccb *sccb;
532 int i, id, assigned, rc;
534 if (!early_read_info_sccb_valid)
536 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
539 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
543 for (id = 0; id <= sclp_max_storage_id; id++) {
544 memset(sccb, 0, PAGE_SIZE);
545 sccb->header.length = PAGE_SIZE;
546 rc = do_sync_request(0x00040001 | id << 8, sccb);
549 switch (sccb->header.response_code) {
551 set_bit(id, sclp_storage_ids);
552 for (i = 0; i < sccb->assigned; i++) {
553 if (!sccb->entries[i])
556 insert_increment(sccb->entries[i] >> 16, 0, 1);
562 for (i = 0; i < sccb->assigned; i++) {
563 if (!sccb->entries[i])
566 insert_increment(sccb->entries[i] >> 16, 1, 1);
574 sclp_max_storage_id = sccb->max_id;
576 if (rc || list_empty(&sclp_mem_list))
578 for (i = 1; i <= rnmax - assigned; i++)
579 insert_increment(0, 1, 0);
580 rc = register_memory_notifier(&sclp_mem_nb);
583 sclp_add_standby_memory();
585 free_page((unsigned long) sccb);
588 __initcall(sclp_detect_standby_memory);
590 #endif /* CONFIG_MEMORY_HOTPLUG */
593 * Channel path configuration related functions.
596 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
597 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
598 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
600 struct chp_cfg_sccb {
601 struct sccb_header header;
605 } __attribute__((packed));
607 static int do_chp_configure(sclp_cmdw_t cmd)
609 struct chp_cfg_sccb *sccb;
612 if (!SCLP_HAS_CHP_RECONFIG)
615 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
618 sccb->header.length = sizeof(*sccb);
619 rc = do_sync_request(cmd, sccb);
622 switch (sccb->header.response_code) {
629 printk(KERN_WARNING TAG "configure channel-path failed "
630 "(cmd=0x%08x, response=0x%04x)\n", cmd,
631 sccb->header.response_code);
636 free_page((unsigned long) sccb);
641 * sclp_chp_configure - perform configure channel-path sclp command
642 * @chpid: channel-path ID
644 * Perform configure channel-path command sclp command for specified chpid.
645 * Return 0 after command successfully finished, non-zero otherwise.
647 int sclp_chp_configure(struct chp_id chpid)
649 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
653 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
654 * @chpid: channel-path ID
656 * Perform deconfigure channel-path command sclp command for specified chpid
657 * and wait for completion. On success return 0. Return non-zero otherwise.
659 int sclp_chp_deconfigure(struct chp_id chpid)
661 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
664 struct chp_info_sccb {
665 struct sccb_header header;
666 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
667 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
668 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
672 } __attribute__((packed));
675 * sclp_chp_read_info - perform read channel-path information sclp command
676 * @info: resulting channel-path information data
678 * Perform read channel-path information sclp command and wait for completion.
679 * On success, store channel-path information in @info and return 0. Return
680 * non-zero otherwise.
682 int sclp_chp_read_info(struct sclp_chp_info *info)
684 struct chp_info_sccb *sccb;
687 if (!SCLP_HAS_CHP_INFO)
690 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
693 sccb->header.length = sizeof(*sccb);
694 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
697 if (sccb->header.response_code != 0x0010) {
698 printk(KERN_WARNING TAG "read channel-path info failed "
699 "(response=0x%04x)\n", sccb->header.response_code);
703 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
704 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
705 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
707 free_page((unsigned long) sccb);