2 * drivers/s390/char/sclp.c
3 * core function to access sclp interface
6 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
8 * Martin Schwidefsky <schwidefsky@de.ibm.com>
11 #include <linux/module.h>
12 #include <linux/err.h>
13 #include <linux/spinlock.h>
14 #include <linux/interrupt.h>
15 #include <linux/timer.h>
16 #include <linux/reboot.h>
17 #include <linux/jiffies.h>
18 #include <linux/init.h>
19 #include <asm/types.h>
20 #include <asm/s390_ext.h>
24 #define SCLP_HEADER "sclp: "
26 /* Structure for register_early_external_interrupt. */
27 static ext_int_info_t ext_int_info_hwc
;
29 /* Lock to protect internal data consistency. */
30 static DEFINE_SPINLOCK(sclp_lock
);
32 /* Mask of events that we can send to the sclp interface. */
33 static sccb_mask_t sclp_receive_mask
;
35 /* Mask of events that we can receive from the sclp interface. */
36 static sccb_mask_t sclp_send_mask
;
38 /* List of registered event listeners and senders. */
39 static struct list_head sclp_reg_list
;
41 /* List of queued requests. */
42 static struct list_head sclp_req_queue
;
44 /* Data for read and and init requests. */
45 static struct sclp_req sclp_read_req
;
46 static struct sclp_req sclp_init_req
;
47 static char sclp_read_sccb
[PAGE_SIZE
] __attribute__((__aligned__(PAGE_SIZE
)));
48 static char sclp_init_sccb
[PAGE_SIZE
] __attribute__((__aligned__(PAGE_SIZE
)));
50 /* Timer for request retries. */
51 static struct timer_list sclp_request_timer
;
53 /* Internal state: is the driver initialized? */
54 static volatile enum sclp_init_state_t
{
55 sclp_init_state_uninitialized
,
56 sclp_init_state_initializing
,
57 sclp_init_state_initialized
58 } sclp_init_state
= sclp_init_state_uninitialized
;
60 /* Internal state: is a request active at the sclp? */
61 static volatile enum sclp_running_state_t
{
62 sclp_running_state_idle
,
63 sclp_running_state_running
,
64 sclp_running_state_reset_pending
65 } sclp_running_state
= sclp_running_state_idle
;
67 /* Internal state: is a read request pending? */
68 static volatile enum sclp_reading_state_t
{
69 sclp_reading_state_idle
,
70 sclp_reading_state_reading
71 } sclp_reading_state
= sclp_reading_state_idle
;
73 /* Internal state: is the driver currently serving requests? */
74 static volatile enum sclp_activation_state_t
{
75 sclp_activation_state_active
,
76 sclp_activation_state_deactivating
,
77 sclp_activation_state_inactive
,
78 sclp_activation_state_activating
79 } sclp_activation_state
= sclp_activation_state_active
;
81 /* Internal state: is an init mask request pending? */
82 static volatile enum sclp_mask_state_t
{
84 sclp_mask_state_initializing
85 } sclp_mask_state
= sclp_mask_state_idle
;
87 /* Maximum retry counts */
88 #define SCLP_INIT_RETRY 3
89 #define SCLP_MASK_RETRY 3
91 /* Timeout intervals in seconds.*/
92 #define SCLP_BUSY_INTERVAL 10
93 #define SCLP_RETRY_INTERVAL 30
95 static void sclp_process_queue(void);
96 static void __sclp_make_read_req(void);
97 static int sclp_init_mask(int calculate
);
98 static int sclp_init(void);
100 /* Perform service call. Return 0 on success, non-zero otherwise. */
102 sclp_service_call(sclp_cmdw_t command
, void *sccb
)
107 " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
110 : "=&d" (cc
) : "d" (command
), "a" (__pa(sccb
))
121 __sclp_queue_read_req(void)
123 if (sclp_reading_state
== sclp_reading_state_idle
) {
124 sclp_reading_state
= sclp_reading_state_reading
;
125 __sclp_make_read_req();
126 /* Add request to head of queue */
127 list_add(&sclp_read_req
.list
, &sclp_req_queue
);
131 /* Set up request retry timer. Called while sclp_lock is locked. */
133 __sclp_set_request_timer(unsigned long time
, void (*function
)(unsigned long),
136 del_timer(&sclp_request_timer
);
137 sclp_request_timer
.function
= function
;
138 sclp_request_timer
.data
= data
;
139 sclp_request_timer
.expires
= jiffies
+ time
;
140 add_timer(&sclp_request_timer
);
143 /* Request timeout handler. Restart the request queue. If DATA is non-zero,
144 * force restart of running request. */
146 sclp_request_timeout(unsigned long data
)
150 spin_lock_irqsave(&sclp_lock
, flags
);
152 if (sclp_running_state
== sclp_running_state_running
) {
153 /* Break running state and queue NOP read event request
154 * to get a defined interface state. */
155 __sclp_queue_read_req();
156 sclp_running_state
= sclp_running_state_idle
;
159 __sclp_set_request_timer(SCLP_BUSY_INTERVAL
* HZ
,
160 sclp_request_timeout
, 0);
162 spin_unlock_irqrestore(&sclp_lock
, flags
);
163 sclp_process_queue();
166 /* Try to start a request. Return zero if the request was successfully
167 * started or if it will be started at a later time. Return non-zero otherwise.
168 * Called while sclp_lock is locked. */
170 __sclp_start_request(struct sclp_req
*req
)
174 if (sclp_running_state
!= sclp_running_state_idle
)
176 del_timer(&sclp_request_timer
);
177 rc
= sclp_service_call(req
->command
, req
->sccb
);
181 /* Sucessfully started request */
182 req
->status
= SCLP_REQ_RUNNING
;
183 sclp_running_state
= sclp_running_state_running
;
184 __sclp_set_request_timer(SCLP_RETRY_INTERVAL
* HZ
,
185 sclp_request_timeout
, 1);
187 } else if (rc
== -EBUSY
) {
188 /* Try again later */
189 __sclp_set_request_timer(SCLP_BUSY_INTERVAL
* HZ
,
190 sclp_request_timeout
, 0);
194 req
->status
= SCLP_REQ_FAILED
;
198 /* Try to start queued requests. */
200 sclp_process_queue(void)
202 struct sclp_req
*req
;
206 spin_lock_irqsave(&sclp_lock
, flags
);
207 if (sclp_running_state
!= sclp_running_state_idle
) {
208 spin_unlock_irqrestore(&sclp_lock
, flags
);
211 del_timer(&sclp_request_timer
);
212 while (!list_empty(&sclp_req_queue
)) {
213 req
= list_entry(sclp_req_queue
.next
, struct sclp_req
, list
);
214 rc
= __sclp_start_request(req
);
218 if (req
->start_count
> 1) {
219 /* Cannot abort already submitted request - could still
220 * be active at the SCLP */
221 __sclp_set_request_timer(SCLP_BUSY_INTERVAL
* HZ
,
222 sclp_request_timeout
, 0);
225 /* Post-processing for aborted request */
226 list_del(&req
->list
);
228 spin_unlock_irqrestore(&sclp_lock
, flags
);
229 req
->callback(req
, req
->callback_data
);
230 spin_lock_irqsave(&sclp_lock
, flags
);
233 spin_unlock_irqrestore(&sclp_lock
, flags
);
236 /* Queue a new request. Return zero on success, non-zero otherwise. */
238 sclp_add_request(struct sclp_req
*req
)
243 spin_lock_irqsave(&sclp_lock
, flags
);
244 if ((sclp_init_state
!= sclp_init_state_initialized
||
245 sclp_activation_state
!= sclp_activation_state_active
) &&
246 req
!= &sclp_init_req
) {
247 spin_unlock_irqrestore(&sclp_lock
, flags
);
250 req
->status
= SCLP_REQ_QUEUED
;
251 req
->start_count
= 0;
252 list_add_tail(&req
->list
, &sclp_req_queue
);
254 /* Start if request is first in list */
255 if (sclp_running_state
== sclp_running_state_idle
&&
256 req
->list
.prev
== &sclp_req_queue
) {
257 rc
= __sclp_start_request(req
);
259 list_del(&req
->list
);
261 spin_unlock_irqrestore(&sclp_lock
, flags
);
265 EXPORT_SYMBOL(sclp_add_request
);
267 /* Dispatch events found in request buffer to registered listeners. Return 0
268 * if all events were dispatched, non-zero otherwise. */
270 sclp_dispatch_evbufs(struct sccb_header
*sccb
)
273 struct evbuf_header
*evbuf
;
275 struct sclp_register
*reg
;
279 spin_lock_irqsave(&sclp_lock
, flags
);
281 for (offset
= sizeof(struct sccb_header
); offset
< sccb
->length
;
282 offset
+= evbuf
->length
) {
283 /* Search for event handler */
284 evbuf
= (struct evbuf_header
*) ((addr_t
) sccb
+ offset
);
286 list_for_each(l
, &sclp_reg_list
) {
287 reg
= list_entry(l
, struct sclp_register
, list
);
288 if (reg
->receive_mask
& (1 << (32 - evbuf
->type
)))
293 if (reg
&& reg
->receiver_fn
) {
294 spin_unlock_irqrestore(&sclp_lock
, flags
);
295 reg
->receiver_fn(evbuf
);
296 spin_lock_irqsave(&sclp_lock
, flags
);
297 } else if (reg
== NULL
)
300 spin_unlock_irqrestore(&sclp_lock
, flags
);
304 /* Read event data request callback. */
306 sclp_read_cb(struct sclp_req
*req
, void *data
)
309 struct sccb_header
*sccb
;
311 sccb
= (struct sccb_header
*) req
->sccb
;
312 if (req
->status
== SCLP_REQ_DONE
&& (sccb
->response_code
== 0x20 ||
313 sccb
->response_code
== 0x220))
314 sclp_dispatch_evbufs(sccb
);
315 spin_lock_irqsave(&sclp_lock
, flags
);
316 sclp_reading_state
= sclp_reading_state_idle
;
317 spin_unlock_irqrestore(&sclp_lock
, flags
);
320 /* Prepare read event data request. Called while sclp_lock is locked. */
321 static void __sclp_make_read_req(void)
323 struct sccb_header
*sccb
;
325 sccb
= (struct sccb_header
*) sclp_read_sccb
;
327 memset(&sclp_read_req
, 0, sizeof(struct sclp_req
));
328 sclp_read_req
.command
= SCLP_CMDW_READ_EVENT_DATA
;
329 sclp_read_req
.status
= SCLP_REQ_QUEUED
;
330 sclp_read_req
.start_count
= 0;
331 sclp_read_req
.callback
= sclp_read_cb
;
332 sclp_read_req
.sccb
= sccb
;
333 sccb
->length
= PAGE_SIZE
;
334 sccb
->function_code
= 0;
335 sccb
->control_mask
[2] = 0x80;
338 /* Search request list for request with matching sccb. Return request if found,
339 * NULL otherwise. Called while sclp_lock is locked. */
340 static inline struct sclp_req
*
341 __sclp_find_req(u32 sccb
)
344 struct sclp_req
*req
;
346 list_for_each(l
, &sclp_req_queue
) {
347 req
= list_entry(l
, struct sclp_req
, list
);
348 if (sccb
== (u32
) (addr_t
) req
->sccb
)
354 /* Handler for external interruption. Perform request post-processing.
355 * Prepare read event data request if necessary. Start processing of next
356 * request on queue. */
358 sclp_interrupt_handler(__u16 code
)
360 struct sclp_req
*req
;
364 spin_lock(&sclp_lock
);
365 finished_sccb
= S390_lowcore
.ext_params
& 0xfffffff8;
366 evbuf_pending
= S390_lowcore
.ext_params
& 0x3;
368 del_timer(&sclp_request_timer
);
369 sclp_running_state
= sclp_running_state_reset_pending
;
370 req
= __sclp_find_req(finished_sccb
);
372 /* Request post-processing */
373 list_del(&req
->list
);
374 req
->status
= SCLP_REQ_DONE
;
376 spin_unlock(&sclp_lock
);
377 req
->callback(req
, req
->callback_data
);
378 spin_lock(&sclp_lock
);
381 sclp_running_state
= sclp_running_state_idle
;
384 sclp_activation_state
== sclp_activation_state_active
)
385 __sclp_queue_read_req();
386 spin_unlock(&sclp_lock
);
387 sclp_process_queue();
390 /* Convert interval in jiffies to TOD ticks. */
392 sclp_tod_from_jiffies(unsigned long jiffies
)
394 return (u64
) (jiffies
/ HZ
) << 32;
397 /* Wait until a currently running request finished. Note: while this function
398 * is running, no timers are served on the calling CPU. */
402 unsigned long long old_tick
;
404 unsigned long cr0
, cr0_sync
;
408 /* We'll be disabling timer interrupts, so we need a custom timeout
411 if (timer_pending(&sclp_request_timer
)) {
412 /* Get timeout TOD value */
413 timeout
= get_clock() +
414 sclp_tod_from_jiffies(sclp_request_timer
.expires
-
417 local_irq_save(flags
);
418 /* Prevent bottom half from executing once we force interrupts open */
419 irq_context
= in_interrupt();
422 /* Enable service-signal interruption, disable timer interrupts */
423 old_tick
= local_tick_disable();
425 __ctl_store(cr0
, 0, 0);
427 cr0_sync
&= 0xffff00a0;
428 cr0_sync
|= 0x00000200;
429 __ctl_load(cr0_sync
, 0, 0);
430 __raw_local_irq_stosm(0x01);
431 /* Loop until driver state indicates finished request */
432 while (sclp_running_state
!= sclp_running_state_idle
) {
433 /* Check for expired request timer */
434 if (timer_pending(&sclp_request_timer
) &&
435 get_clock() > timeout
&&
436 del_timer(&sclp_request_timer
))
437 sclp_request_timer
.function(sclp_request_timer
.data
);
441 __ctl_load(cr0
, 0, 0);
444 local_tick_enable(old_tick
);
445 local_irq_restore(flags
);
447 EXPORT_SYMBOL(sclp_sync_wait
);
449 /* Dispatch changes in send and receive mask to registered listeners. */
451 sclp_dispatch_state_change(void)
454 struct sclp_register
*reg
;
456 sccb_mask_t receive_mask
;
457 sccb_mask_t send_mask
;
460 spin_lock_irqsave(&sclp_lock
, flags
);
462 list_for_each(l
, &sclp_reg_list
) {
463 reg
= list_entry(l
, struct sclp_register
, list
);
464 receive_mask
= reg
->send_mask
& sclp_receive_mask
;
465 send_mask
= reg
->receive_mask
& sclp_send_mask
;
466 if (reg
->sclp_receive_mask
!= receive_mask
||
467 reg
->sclp_send_mask
!= send_mask
) {
468 reg
->sclp_receive_mask
= receive_mask
;
469 reg
->sclp_send_mask
= send_mask
;
474 spin_unlock_irqrestore(&sclp_lock
, flags
);
475 if (reg
&& reg
->state_change_fn
)
476 reg
->state_change_fn(reg
);
480 struct sclp_statechangebuf
{
481 struct evbuf_header header
;
482 u8 validity_sclp_active_facility_mask
: 1;
483 u8 validity_sclp_receive_mask
: 1;
484 u8 validity_sclp_send_mask
: 1;
485 u8 validity_read_data_function_mask
: 1;
488 u64 sclp_active_facility_mask
;
489 sccb_mask_t sclp_receive_mask
;
490 sccb_mask_t sclp_send_mask
;
491 u32 read_data_function_mask
;
492 } __attribute__((packed
));
495 /* State change event callback. Inform listeners of changes. */
497 sclp_state_change_cb(struct evbuf_header
*evbuf
)
500 struct sclp_statechangebuf
*scbuf
;
502 scbuf
= (struct sclp_statechangebuf
*) evbuf
;
503 if (scbuf
->mask_length
!= sizeof(sccb_mask_t
))
505 spin_lock_irqsave(&sclp_lock
, flags
);
506 if (scbuf
->validity_sclp_receive_mask
)
507 sclp_receive_mask
= scbuf
->sclp_receive_mask
;
508 if (scbuf
->validity_sclp_send_mask
)
509 sclp_send_mask
= scbuf
->sclp_send_mask
;
510 spin_unlock_irqrestore(&sclp_lock
, flags
);
511 if (scbuf
->validity_sclp_active_facility_mask
)
512 sclp_facilities
= scbuf
->sclp_active_facility_mask
;
513 sclp_dispatch_state_change();
516 static struct sclp_register sclp_state_change_event
= {
517 .receive_mask
= EVTYP_STATECHANGE_MASK
,
518 .receiver_fn
= sclp_state_change_cb
521 /* Calculate receive and send mask of currently registered listeners.
522 * Called while sclp_lock is locked. */
524 __sclp_get_mask(sccb_mask_t
*receive_mask
, sccb_mask_t
*send_mask
)
527 struct sclp_register
*t
;
531 list_for_each(l
, &sclp_reg_list
) {
532 t
= list_entry(l
, struct sclp_register
, list
);
533 *receive_mask
|= t
->receive_mask
;
534 *send_mask
|= t
->send_mask
;
538 /* Register event listener. Return 0 on success, non-zero otherwise. */
540 sclp_register(struct sclp_register
*reg
)
543 sccb_mask_t receive_mask
;
544 sccb_mask_t send_mask
;
550 spin_lock_irqsave(&sclp_lock
, flags
);
551 /* Check event mask for collisions */
552 __sclp_get_mask(&receive_mask
, &send_mask
);
553 if (reg
->receive_mask
& receive_mask
|| reg
->send_mask
& send_mask
) {
554 spin_unlock_irqrestore(&sclp_lock
, flags
);
557 /* Trigger initial state change callback */
558 reg
->sclp_receive_mask
= 0;
559 reg
->sclp_send_mask
= 0;
560 list_add(®
->list
, &sclp_reg_list
);
561 spin_unlock_irqrestore(&sclp_lock
, flags
);
562 rc
= sclp_init_mask(1);
564 spin_lock_irqsave(&sclp_lock
, flags
);
565 list_del(®
->list
);
566 spin_unlock_irqrestore(&sclp_lock
, flags
);
571 EXPORT_SYMBOL(sclp_register
);
573 /* Unregister event listener. */
575 sclp_unregister(struct sclp_register
*reg
)
579 spin_lock_irqsave(&sclp_lock
, flags
);
580 list_del(®
->list
);
581 spin_unlock_irqrestore(&sclp_lock
, flags
);
585 EXPORT_SYMBOL(sclp_unregister
);
587 /* Remove event buffers which are marked processed. Return the number of
588 * remaining event buffers. */
590 sclp_remove_processed(struct sccb_header
*sccb
)
592 struct evbuf_header
*evbuf
;
596 evbuf
= (struct evbuf_header
*) (sccb
+ 1);
598 remaining
= sccb
->length
- sizeof(struct sccb_header
);
599 while (remaining
> 0) {
600 remaining
-= evbuf
->length
;
601 if (evbuf
->flags
& 0x80) {
602 sccb
->length
-= evbuf
->length
;
603 memcpy(evbuf
, (void *) ((addr_t
) evbuf
+ evbuf
->length
),
607 evbuf
= (struct evbuf_header
*)
608 ((addr_t
) evbuf
+ evbuf
->length
);
614 EXPORT_SYMBOL(sclp_remove_processed
);
617 struct sccb_header header
;
620 sccb_mask_t receive_mask
;
621 sccb_mask_t send_mask
;
622 sccb_mask_t sclp_receive_mask
;
623 sccb_mask_t sclp_send_mask
;
624 } __attribute__((packed
));
626 /* Prepare init mask request. Called while sclp_lock is locked. */
628 __sclp_make_init_req(u32 receive_mask
, u32 send_mask
)
630 struct init_sccb
*sccb
;
632 sccb
= (struct init_sccb
*) sclp_init_sccb
;
634 memset(&sclp_init_req
, 0, sizeof(struct sclp_req
));
635 sclp_init_req
.command
= SCLP_CMDW_WRITE_EVENT_MASK
;
636 sclp_init_req
.status
= SCLP_REQ_FILLED
;
637 sclp_init_req
.start_count
= 0;
638 sclp_init_req
.callback
= NULL
;
639 sclp_init_req
.callback_data
= NULL
;
640 sclp_init_req
.sccb
= sccb
;
641 sccb
->header
.length
= sizeof(struct init_sccb
);
642 sccb
->mask_length
= sizeof(sccb_mask_t
);
643 sccb
->receive_mask
= receive_mask
;
644 sccb
->send_mask
= send_mask
;
645 sccb
->sclp_receive_mask
= 0;
646 sccb
->sclp_send_mask
= 0;
649 /* Start init mask request. If calculate is non-zero, calculate the mask as
650 * requested by registered listeners. Use zero mask otherwise. Return 0 on
651 * success, non-zero otherwise. */
653 sclp_init_mask(int calculate
)
656 struct init_sccb
*sccb
= (struct init_sccb
*) sclp_init_sccb
;
657 sccb_mask_t receive_mask
;
658 sccb_mask_t send_mask
;
663 spin_lock_irqsave(&sclp_lock
, flags
);
664 /* Check if interface is in appropriate state */
665 if (sclp_mask_state
!= sclp_mask_state_idle
) {
666 spin_unlock_irqrestore(&sclp_lock
, flags
);
669 if (sclp_activation_state
== sclp_activation_state_inactive
) {
670 spin_unlock_irqrestore(&sclp_lock
, flags
);
673 sclp_mask_state
= sclp_mask_state_initializing
;
676 __sclp_get_mask(&receive_mask
, &send_mask
);
682 for (retry
= 0; retry
<= SCLP_MASK_RETRY
; retry
++) {
683 /* Prepare request */
684 __sclp_make_init_req(receive_mask
, send_mask
);
685 spin_unlock_irqrestore(&sclp_lock
, flags
);
686 if (sclp_add_request(&sclp_init_req
)) {
687 /* Try again later */
688 wait
= jiffies
+ SCLP_BUSY_INTERVAL
* HZ
;
689 while (time_before(jiffies
, wait
))
691 spin_lock_irqsave(&sclp_lock
, flags
);
694 while (sclp_init_req
.status
!= SCLP_REQ_DONE
&&
695 sclp_init_req
.status
!= SCLP_REQ_FAILED
)
697 spin_lock_irqsave(&sclp_lock
, flags
);
698 if (sclp_init_req
.status
== SCLP_REQ_DONE
&&
699 sccb
->header
.response_code
== 0x20) {
700 /* Successful request */
702 sclp_receive_mask
= sccb
->sclp_receive_mask
;
703 sclp_send_mask
= sccb
->sclp_send_mask
;
705 sclp_receive_mask
= 0;
708 spin_unlock_irqrestore(&sclp_lock
, flags
);
709 sclp_dispatch_state_change();
710 spin_lock_irqsave(&sclp_lock
, flags
);
715 sclp_mask_state
= sclp_mask_state_idle
;
716 spin_unlock_irqrestore(&sclp_lock
, flags
);
720 /* Deactivate SCLP interface. On success, new requests will be rejected,
721 * events will no longer be dispatched. Return 0 on success, non-zero
724 sclp_deactivate(void)
729 spin_lock_irqsave(&sclp_lock
, flags
);
730 /* Deactivate can only be called when active */
731 if (sclp_activation_state
!= sclp_activation_state_active
) {
732 spin_unlock_irqrestore(&sclp_lock
, flags
);
735 sclp_activation_state
= sclp_activation_state_deactivating
;
736 spin_unlock_irqrestore(&sclp_lock
, flags
);
737 rc
= sclp_init_mask(0);
738 spin_lock_irqsave(&sclp_lock
, flags
);
740 sclp_activation_state
= sclp_activation_state_inactive
;
742 sclp_activation_state
= sclp_activation_state_active
;
743 spin_unlock_irqrestore(&sclp_lock
, flags
);
747 EXPORT_SYMBOL(sclp_deactivate
);
749 /* Reactivate SCLP interface after sclp_deactivate. On success, new
750 * requests will be accepted, events will be dispatched again. Return 0 on
751 * success, non-zero otherwise. */
753 sclp_reactivate(void)
758 spin_lock_irqsave(&sclp_lock
, flags
);
759 /* Reactivate can only be called when inactive */
760 if (sclp_activation_state
!= sclp_activation_state_inactive
) {
761 spin_unlock_irqrestore(&sclp_lock
, flags
);
764 sclp_activation_state
= sclp_activation_state_activating
;
765 spin_unlock_irqrestore(&sclp_lock
, flags
);
766 rc
= sclp_init_mask(1);
767 spin_lock_irqsave(&sclp_lock
, flags
);
769 sclp_activation_state
= sclp_activation_state_active
;
771 sclp_activation_state
= sclp_activation_state_inactive
;
772 spin_unlock_irqrestore(&sclp_lock
, flags
);
776 EXPORT_SYMBOL(sclp_reactivate
);
778 /* Handler for external interruption used during initialization. Modify
779 * request state to done. */
781 sclp_check_handler(__u16 code
)
785 finished_sccb
= S390_lowcore
.ext_params
& 0xfffffff8;
786 /* Is this the interrupt we are waiting for? */
787 if (finished_sccb
== 0)
789 if (finished_sccb
!= (u32
) (addr_t
) sclp_init_sccb
)
790 panic("sclp: unsolicited interrupt for buffer at 0x%x\n",
792 spin_lock(&sclp_lock
);
793 if (sclp_running_state
== sclp_running_state_running
) {
794 sclp_init_req
.status
= SCLP_REQ_DONE
;
795 sclp_running_state
= sclp_running_state_idle
;
797 spin_unlock(&sclp_lock
);
800 /* Initial init mask request timed out. Modify request state to failed. */
802 sclp_check_timeout(unsigned long data
)
806 spin_lock_irqsave(&sclp_lock
, flags
);
807 if (sclp_running_state
== sclp_running_state_running
) {
808 sclp_init_req
.status
= SCLP_REQ_FAILED
;
809 sclp_running_state
= sclp_running_state_idle
;
811 spin_unlock_irqrestore(&sclp_lock
, flags
);
814 /* Perform a check of the SCLP interface. Return zero if the interface is
815 * available and there are no pending requests from a previous instance.
816 * Return non-zero otherwise. */
818 sclp_check_interface(void)
820 struct init_sccb
*sccb
;
825 spin_lock_irqsave(&sclp_lock
, flags
);
826 /* Prepare init mask command */
827 rc
= register_early_external_interrupt(0x2401, sclp_check_handler
,
830 spin_unlock_irqrestore(&sclp_lock
, flags
);
833 for (retry
= 0; retry
<= SCLP_INIT_RETRY
; retry
++) {
834 __sclp_make_init_req(0, 0);
835 sccb
= (struct init_sccb
*) sclp_init_req
.sccb
;
836 rc
= sclp_service_call(sclp_init_req
.command
, sccb
);
839 sclp_init_req
.status
= SCLP_REQ_RUNNING
;
840 sclp_running_state
= sclp_running_state_running
;
841 __sclp_set_request_timer(SCLP_RETRY_INTERVAL
* HZ
,
842 sclp_check_timeout
, 0);
843 spin_unlock_irqrestore(&sclp_lock
, flags
);
844 /* Enable service-signal interruption - needs to happen
845 * with IRQs enabled. */
847 /* Wait for signal from interrupt or timeout */
849 /* Disable service-signal interruption - needs to happen
850 * with IRQs enabled. */
852 spin_lock_irqsave(&sclp_lock
, flags
);
853 del_timer(&sclp_request_timer
);
854 if (sclp_init_req
.status
== SCLP_REQ_DONE
&&
855 sccb
->header
.response_code
== 0x20) {
861 unregister_early_external_interrupt(0x2401, sclp_check_handler
,
863 spin_unlock_irqrestore(&sclp_lock
, flags
);
867 /* Reboot event handler. Reset send and receive mask to prevent pending SCLP
868 * events from interfering with rebooted system. */
870 sclp_reboot_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
876 static struct notifier_block sclp_reboot_notifier
= {
877 .notifier_call
= sclp_reboot_event
880 /* Initialize SCLP driver. Return zero if driver is operational, non-zero
888 spin_lock_irqsave(&sclp_lock
, flags
);
889 /* Check for previous or running initialization */
890 if (sclp_init_state
!= sclp_init_state_uninitialized
) {
891 spin_unlock_irqrestore(&sclp_lock
, flags
);
894 sclp_init_state
= sclp_init_state_initializing
;
895 /* Set up variables */
896 INIT_LIST_HEAD(&sclp_req_queue
);
897 INIT_LIST_HEAD(&sclp_reg_list
);
898 list_add(&sclp_state_change_event
.list
, &sclp_reg_list
);
899 init_timer(&sclp_request_timer
);
900 /* Check interface */
901 spin_unlock_irqrestore(&sclp_lock
, flags
);
902 rc
= sclp_check_interface();
903 spin_lock_irqsave(&sclp_lock
, flags
);
905 sclp_init_state
= sclp_init_state_uninitialized
;
906 spin_unlock_irqrestore(&sclp_lock
, flags
);
909 /* Register reboot handler */
910 rc
= register_reboot_notifier(&sclp_reboot_notifier
);
912 sclp_init_state
= sclp_init_state_uninitialized
;
913 spin_unlock_irqrestore(&sclp_lock
, flags
);
916 /* Register interrupt handler */
917 rc
= register_early_external_interrupt(0x2401, sclp_interrupt_handler
,
920 unregister_reboot_notifier(&sclp_reboot_notifier
);
921 sclp_init_state
= sclp_init_state_uninitialized
;
922 spin_unlock_irqrestore(&sclp_lock
, flags
);
925 sclp_init_state
= sclp_init_state_initialized
;
926 spin_unlock_irqrestore(&sclp_lock
, flags
);
927 /* Enable service-signal external interruption - needs to happen with
934 static __init
int sclp_initcall(void)
939 arch_initcall(sclp_initcall
);