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>
27 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
28 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
30 struct read_info_sccb
{
31 struct sccb_header header
; /* 0-7 */
34 u8 _reserved0
[24 - 11]; /* 11-15 */
35 u8 loadparm
[8]; /* 24-31 */
36 u8 _reserved1
[48 - 32]; /* 32-47 */
37 u64 facilities
; /* 48-55 */
38 u8 _reserved2
[84 - 56]; /* 56-83 */
40 u8 _reserved3
[91 - 85]; /* 85-90 */
42 u8 _reserved4
[100 - 92]; /* 92-99 */
43 u32 rnsize2
; /* 100-103 */
44 u64 rnmax2
; /* 104-111 */
45 u8 _reserved5
[4096 - 112]; /* 112-4095 */
46 } __attribute__((packed
, aligned(PAGE_SIZE
)));
48 static struct read_info_sccb __initdata early_read_info_sccb
;
49 static int __initdata early_read_info_sccb_valid
;
53 static unsigned long long rzm
;
54 static unsigned long long rnmax
;
56 static int __init
sclp_cmd_sync_early(sclp_cmdw_t cmd
, void *sccb
)
61 rc
= sclp_service_call(cmd
, sccb
);
64 __load_psw_mask(PSW_BASE_BITS
| PSW_MASK_EXT
|
65 PSW_MASK_WAIT
| PSW_DEFAULT_KEY
);
68 /* Contents of the sccb might have changed. */
70 __ctl_clear_bit(0, 9);
74 static void __init
sclp_read_info_early(void)
78 struct read_info_sccb
*sccb
;
79 sclp_cmdw_t commands
[] = {SCLP_CMDW_READ_SCP_INFO_FORCED
,
80 SCLP_CMDW_READ_SCP_INFO
};
82 sccb
= &early_read_info_sccb
;
83 for (i
= 0; i
< ARRAY_SIZE(commands
); i
++) {
85 memset(sccb
, 0, sizeof(*sccb
));
86 sccb
->header
.length
= sizeof(*sccb
);
87 sccb
->header
.function_code
= 0x80;
88 sccb
->header
.control_mask
[2] = 0x80;
89 rc
= sclp_cmd_sync_early(commands
[i
], sccb
);
90 } while (rc
== -EBUSY
);
94 if (sccb
->header
.response_code
== 0x10) {
95 early_read_info_sccb_valid
= 1;
98 if (sccb
->header
.response_code
!= 0x1f0)
103 void __init
sclp_facilities_detect(void)
105 struct read_info_sccb
*sccb
;
107 sclp_read_info_early();
108 if (!early_read_info_sccb_valid
)
111 sccb
= &early_read_info_sccb
;
112 sclp_facilities
= sccb
->facilities
;
113 sclp_fac84
= sccb
->fac84
;
114 rnmax
= sccb
->rnmax
? sccb
->rnmax
: sccb
->rnmax2
;
115 rzm
= sccb
->rnsize
? sccb
->rnsize
: sccb
->rnsize2
;
119 unsigned long long sclp_get_rnmax(void)
124 unsigned long long sclp_get_rzm(void)
130 * This function will be called after sclp_facilities_detect(), which gets
131 * called from early.c code. Therefore the sccb should have valid contents.
133 void __init
sclp_get_ipl_info(struct sclp_ipl_info
*info
)
135 struct read_info_sccb
*sccb
;
137 if (!early_read_info_sccb_valid
)
139 sccb
= &early_read_info_sccb
;
141 if (sccb
->flags
& 0x2)
143 memcpy(&info
->loadparm
, &sccb
->loadparm
, LOADPARM_LEN
);
146 static void sclp_sync_callback(struct sclp_req
*req
, void *data
)
148 struct completion
*completion
= data
;
150 complete(completion
);
153 static int do_sync_request(sclp_cmdw_t cmd
, void *sccb
)
155 struct completion completion
;
156 struct sclp_req
*request
;
159 request
= kzalloc(sizeof(*request
), GFP_KERNEL
);
162 request
->command
= cmd
;
163 request
->sccb
= sccb
;
164 request
->status
= SCLP_REQ_FILLED
;
165 request
->callback
= sclp_sync_callback
;
166 request
->callback_data
= &completion
;
167 init_completion(&completion
);
169 /* Perform sclp request. */
170 rc
= sclp_add_request(request
);
173 wait_for_completion(&completion
);
175 /* Check response. */
176 if (request
->status
!= SCLP_REQ_DONE
) {
177 pr_warning("sync request failed (cmd=0x%08x, "
178 "status=0x%02x)\n", cmd
, request
->status
);
187 * CPU configuration related functions.
190 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
191 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
192 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
194 struct read_cpu_info_sccb
{
195 struct sccb_header header
;
197 u16 offset_configured
;
200 u8 reserved
[4096 - 16];
201 } __attribute__((packed
, aligned(PAGE_SIZE
)));
203 static void sclp_fill_cpu_info(struct sclp_cpu_info
*info
,
204 struct read_cpu_info_sccb
*sccb
)
206 char *page
= (char *) sccb
;
208 memset(info
, 0, sizeof(*info
));
209 info
->configured
= sccb
->nr_configured
;
210 info
->standby
= sccb
->nr_standby
;
211 info
->combined
= sccb
->nr_configured
+ sccb
->nr_standby
;
212 info
->has_cpu_type
= sclp_fac84
& 0x1;
213 memcpy(&info
->cpu
, page
+ sccb
->offset_configured
,
214 info
->combined
* sizeof(struct sclp_cpu_entry
));
217 int sclp_get_cpu_info(struct sclp_cpu_info
*info
)
220 struct read_cpu_info_sccb
*sccb
;
222 if (!SCLP_HAS_CPU_INFO
)
224 sccb
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
227 sccb
->header
.length
= sizeof(*sccb
);
228 rc
= do_sync_request(SCLP_CMDW_READ_CPU_INFO
, sccb
);
231 if (sccb
->header
.response_code
!= 0x0010) {
232 pr_warning("readcpuinfo failed (response=0x%04x)\n",
233 sccb
->header
.response_code
);
237 sclp_fill_cpu_info(info
, sccb
);
239 free_page((unsigned long) sccb
);
243 struct cpu_configure_sccb
{
244 struct sccb_header header
;
245 } __attribute__((packed
, aligned(8)));
247 static int do_cpu_configure(sclp_cmdw_t cmd
)
249 struct cpu_configure_sccb
*sccb
;
252 if (!SCLP_HAS_CPU_RECONFIG
)
255 * This is not going to cross a page boundary since we force
256 * kmalloc to have a minimum alignment of 8 bytes on s390.
258 sccb
= kzalloc(sizeof(*sccb
), GFP_KERNEL
| GFP_DMA
);
261 sccb
->header
.length
= sizeof(*sccb
);
262 rc
= do_sync_request(cmd
, sccb
);
265 switch (sccb
->header
.response_code
) {
270 pr_warning("configure cpu failed (cmd=0x%08x, "
271 "response=0x%04x)\n", cmd
,
272 sccb
->header
.response_code
);
281 int sclp_cpu_configure(u8 cpu
)
283 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU
| cpu
<< 8);
286 int sclp_cpu_deconfigure(u8 cpu
)
288 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU
| cpu
<< 8);
291 #ifdef CONFIG_MEMORY_HOTPLUG
293 static DEFINE_MUTEX(sclp_mem_mutex
);
294 static LIST_HEAD(sclp_mem_list
);
295 static u8 sclp_max_storage_id
;
296 static unsigned long sclp_storage_ids
[256 / BITS_PER_LONG
];
297 static int sclp_mem_state_changed
;
299 struct memory_increment
{
300 struct list_head list
;
306 struct assign_storage_sccb
{
307 struct sccb_header header
;
311 static unsigned long long rn2addr(u16 rn
)
313 return (unsigned long long) (rn
- 1) * rzm
;
316 static int do_assign_storage(sclp_cmdw_t cmd
, u16 rn
)
318 struct assign_storage_sccb
*sccb
;
321 sccb
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
324 sccb
->header
.length
= PAGE_SIZE
;
326 rc
= do_sync_request(cmd
, sccb
);
329 switch (sccb
->header
.response_code
) {
334 pr_warning("assign storage failed (cmd=0x%08x, "
335 "response=0x%04x, rn=0x%04x)\n", cmd
,
336 sccb
->header
.response_code
, rn
);
341 free_page((unsigned long) sccb
);
345 static int sclp_assign_storage(u16 rn
)
347 return do_assign_storage(0x000d0001, rn
);
350 static int sclp_unassign_storage(u16 rn
)
352 return do_assign_storage(0x000c0001, rn
);
355 struct attach_storage_sccb
{
356 struct sccb_header header
;
363 static int sclp_attach_storage(u8 id
)
365 struct attach_storage_sccb
*sccb
;
369 sccb
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
372 sccb
->header
.length
= PAGE_SIZE
;
373 rc
= do_sync_request(0x00080001 | id
<< 8, sccb
);
376 switch (sccb
->header
.response_code
) {
378 set_bit(id
, sclp_storage_ids
);
379 for (i
= 0; i
< sccb
->assigned
; i
++)
380 sclp_unassign_storage(sccb
->entries
[i
] >> 16);
387 free_page((unsigned long) sccb
);
391 static int sclp_mem_change_state(unsigned long start
, unsigned long size
,
394 struct memory_increment
*incr
;
395 unsigned long long istart
;
398 list_for_each_entry(incr
, &sclp_mem_list
, list
) {
399 istart
= rn2addr(incr
->rn
);
400 if (start
+ size
- 1 < istart
)
402 if (start
> istart
+ rzm
- 1)
405 if (incr
->usecount
++)
408 * Don't break the loop if one assign fails. Loop may
409 * be walked again on CANCEL and we can't save
410 * information if state changed before or not.
411 * So continue and increase usecount for all increments.
413 rc
|= sclp_assign_storage(incr
->rn
);
415 if (--incr
->usecount
)
417 sclp_unassign_storage(incr
->rn
);
420 return rc
? -EIO
: 0;
423 static int sclp_mem_notifier(struct notifier_block
*nb
,
424 unsigned long action
, void *data
)
426 unsigned long start
, size
;
427 struct memory_notify
*arg
;
432 start
= arg
->start_pfn
<< PAGE_SHIFT
;
433 size
= arg
->nr_pages
<< PAGE_SHIFT
;
434 mutex_lock(&sclp_mem_mutex
);
435 for (id
= 0; id
<= sclp_max_storage_id
; id
++)
436 if (!test_bit(id
, sclp_storage_ids
))
437 sclp_attach_storage(id
);
440 case MEM_GOING_OFFLINE
:
441 case MEM_CANCEL_OFFLINE
:
443 case MEM_GOING_ONLINE
:
444 rc
= sclp_mem_change_state(start
, size
, 1);
446 case MEM_CANCEL_ONLINE
:
447 sclp_mem_change_state(start
, size
, 0);
450 sclp_mem_change_state(start
, size
, 0);
457 sclp_mem_state_changed
= 1;
458 mutex_unlock(&sclp_mem_mutex
);
459 return rc
? NOTIFY_BAD
: NOTIFY_OK
;
462 static struct notifier_block sclp_mem_nb
= {
463 .notifier_call
= sclp_mem_notifier
,
466 static void __init
add_memory_merged(u16 rn
)
468 static u16 first_rn
, num
;
469 unsigned long long start
, size
;
471 if (rn
&& first_rn
&& (first_rn
+ num
== rn
)) {
477 start
= rn2addr(first_rn
);
478 size
= (unsigned long long ) num
* rzm
;
479 if (start
>= VMEM_MAX_PHYS
)
481 if (start
+ size
> VMEM_MAX_PHYS
)
482 size
= VMEM_MAX_PHYS
- start
;
483 if (memory_end_set
&& (start
>= memory_end
))
485 if (memory_end_set
&& (start
+ size
> memory_end
))
486 size
= memory_end
- start
;
487 add_memory(0, start
, size
);
493 static void __init
sclp_add_standby_memory(void)
495 struct memory_increment
*incr
;
497 list_for_each_entry(incr
, &sclp_mem_list
, list
)
499 add_memory_merged(incr
->rn
);
500 add_memory_merged(0);
503 static void __init
insert_increment(u16 rn
, int standby
, int assigned
)
505 struct memory_increment
*incr
, *new_incr
;
506 struct list_head
*prev
;
509 new_incr
= kzalloc(sizeof(*new_incr
), GFP_KERNEL
);
513 new_incr
->standby
= standby
;
515 prev
= &sclp_mem_list
;
516 list_for_each_entry(incr
, &sclp_mem_list
, list
) {
517 if (assigned
&& incr
->rn
> rn
)
519 if (!assigned
&& incr
->rn
- last_rn
> 1)
525 new_incr
->rn
= last_rn
+ 1;
526 if (new_incr
->rn
> rnmax
) {
530 list_add(&new_incr
->list
, prev
);
533 static int sclp_mem_freeze(struct device
*dev
)
535 if (!sclp_mem_state_changed
)
537 pr_err("Memory hotplug state changed, suspend refused.\n");
541 struct read_storage_sccb
{
542 struct sccb_header header
;
550 static const struct dev_pm_ops sclp_mem_pm_ops
= {
551 .freeze
= sclp_mem_freeze
,
554 static struct platform_driver sclp_mem_pdrv
= {
557 .pm
= &sclp_mem_pm_ops
,
561 static int __init
sclp_detect_standby_memory(void)
563 struct platform_device
*sclp_pdev
;
564 struct read_storage_sccb
*sccb
;
565 int i
, id
, assigned
, rc
;
567 if (!early_read_info_sccb_valid
)
569 if ((sclp_facilities
& 0xe00000000000ULL
) != 0xe00000000000ULL
)
572 sccb
= (void *) __get_free_page(GFP_KERNEL
| GFP_DMA
);
576 for (id
= 0; id
<= sclp_max_storage_id
; id
++) {
577 memset(sccb
, 0, PAGE_SIZE
);
578 sccb
->header
.length
= PAGE_SIZE
;
579 rc
= do_sync_request(0x00040001 | id
<< 8, sccb
);
582 switch (sccb
->header
.response_code
) {
584 set_bit(id
, sclp_storage_ids
);
585 for (i
= 0; i
< sccb
->assigned
; i
++) {
586 if (!sccb
->entries
[i
])
589 insert_increment(sccb
->entries
[i
] >> 16, 0, 1);
595 for (i
= 0; i
< sccb
->assigned
; i
++) {
596 if (!sccb
->entries
[i
])
599 insert_increment(sccb
->entries
[i
] >> 16, 1, 1);
607 sclp_max_storage_id
= sccb
->max_id
;
609 if (rc
|| list_empty(&sclp_mem_list
))
611 for (i
= 1; i
<= rnmax
- assigned
; i
++)
612 insert_increment(0, 1, 0);
613 rc
= register_memory_notifier(&sclp_mem_nb
);
616 rc
= platform_driver_register(&sclp_mem_pdrv
);
619 sclp_pdev
= platform_device_register_simple("sclp_mem", -1, NULL
, 0);
620 rc
= IS_ERR(sclp_pdev
) ? PTR_ERR(sclp_pdev
) : 0;
623 sclp_add_standby_memory();
626 platform_driver_unregister(&sclp_mem_pdrv
);
628 free_page((unsigned long) sccb
);
631 __initcall(sclp_detect_standby_memory
);
633 #endif /* CONFIG_MEMORY_HOTPLUG */
636 * Channel path configuration related functions.
639 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
640 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
641 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
643 struct chp_cfg_sccb
{
644 struct sccb_header header
;
648 } __attribute__((packed
));
650 static int do_chp_configure(sclp_cmdw_t cmd
)
652 struct chp_cfg_sccb
*sccb
;
655 if (!SCLP_HAS_CHP_RECONFIG
)
658 sccb
= (struct chp_cfg_sccb
*) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
661 sccb
->header
.length
= sizeof(*sccb
);
662 rc
= do_sync_request(cmd
, sccb
);
665 switch (sccb
->header
.response_code
) {
672 pr_warning("configure channel-path failed "
673 "(cmd=0x%08x, response=0x%04x)\n", cmd
,
674 sccb
->header
.response_code
);
679 free_page((unsigned long) sccb
);
684 * sclp_chp_configure - perform configure channel-path sclp command
685 * @chpid: channel-path ID
687 * Perform configure channel-path command sclp command for specified chpid.
688 * Return 0 after command successfully finished, non-zero otherwise.
690 int sclp_chp_configure(struct chp_id chpid
)
692 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH
| chpid
.id
<< 8);
696 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
697 * @chpid: channel-path ID
699 * Perform deconfigure channel-path command sclp command for specified chpid
700 * and wait for completion. On success return 0. Return non-zero otherwise.
702 int sclp_chp_deconfigure(struct chp_id chpid
)
704 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH
| chpid
.id
<< 8);
707 struct chp_info_sccb
{
708 struct sccb_header header
;
709 u8 recognized
[SCLP_CHP_INFO_MASK_SIZE
];
710 u8 standby
[SCLP_CHP_INFO_MASK_SIZE
];
711 u8 configured
[SCLP_CHP_INFO_MASK_SIZE
];
715 } __attribute__((packed
));
718 * sclp_chp_read_info - perform read channel-path information sclp command
719 * @info: resulting channel-path information data
721 * Perform read channel-path information sclp command and wait for completion.
722 * On success, store channel-path information in @info and return 0. Return
723 * non-zero otherwise.
725 int sclp_chp_read_info(struct sclp_chp_info
*info
)
727 struct chp_info_sccb
*sccb
;
730 if (!SCLP_HAS_CHP_INFO
)
733 sccb
= (struct chp_info_sccb
*) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
736 sccb
->header
.length
= sizeof(*sccb
);
737 rc
= do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION
, sccb
);
740 if (sccb
->header
.response_code
!= 0x0010) {
741 pr_warning("read channel-path info failed "
742 "(response=0x%04x)\n", sccb
->header
.response_code
);
746 memcpy(info
->recognized
, sccb
->recognized
, SCLP_CHP_INFO_MASK_SIZE
);
747 memcpy(info
->standby
, sccb
->standby
, SCLP_CHP_INFO_MASK_SIZE
);
748 memcpy(info
->configured
, sccb
->configured
, SCLP_CHP_INFO_MASK_SIZE
);
750 free_page((unsigned long) sccb
);