2 * Copyright IBM Corp. 2006, 2012
3 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
4 * Martin Schwidefsky <schwidefsky@de.ibm.com>
5 * Ralph Wuerthner <rwuerthn@de.ibm.com>
6 * Felix Beck <felix.beck@de.ibm.com>
7 * Holger Dengler <hd@linux.vnet.ibm.com>
9 * Adjunct processor bus.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #define KMSG_COMPONENT "ap"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
29 #include <linux/kernel_stat.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/delay.h>
33 #include <linux/err.h>
34 #include <linux/interrupt.h>
35 #include <linux/workqueue.h>
36 #include <linux/slab.h>
37 #include <linux/notifier.h>
38 #include <linux/kthread.h>
39 #include <linux/mutex.h>
40 #include <linux/suspend.h>
41 #include <asm/reset.h>
43 #include <linux/atomic.h>
45 #include <linux/hrtimer.h>
46 #include <linux/ktime.h>
47 #include <asm/facility.h>
48 #include <linux/crypto.h>
55 MODULE_AUTHOR("IBM Corporation");
56 MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \
57 "Copyright IBM Corp. 2006, 2012");
58 MODULE_LICENSE("GPL");
59 MODULE_ALIAS_CRYPTO("z90crypt");
64 int ap_domain_index = -1; /* Adjunct Processor Domain Index */
65 module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP);
66 MODULE_PARM_DESC(domain, "domain index for ap devices");
67 EXPORT_SYMBOL(ap_domain_index);
69 static int ap_thread_flag = 0;
70 module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP);
71 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
73 static struct device *ap_root_device = NULL;
74 static struct ap_config_info *ap_configuration;
75 static DEFINE_SPINLOCK(ap_device_list_lock);
76 static LIST_HEAD(ap_device_list);
79 * Workqueue timer for bus rescan.
81 static struct timer_list ap_config_timer;
82 static int ap_config_time = AP_CONFIG_TIME;
83 static void ap_scan_bus(struct work_struct *);
84 static DECLARE_WORK(ap_scan_work, ap_scan_bus);
87 * Tasklet & timer for AP request polling and interrupts
89 static void ap_tasklet_fn(unsigned long);
90 static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0);
91 static atomic_t ap_poll_requests = ATOMIC_INIT(0);
92 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
93 static struct task_struct *ap_poll_kthread = NULL;
94 static DEFINE_MUTEX(ap_poll_thread_mutex);
95 static DEFINE_SPINLOCK(ap_poll_timer_lock);
96 static struct hrtimer ap_poll_timer;
97 /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
98 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/
99 static unsigned long long poll_timeout = 250000;
102 static int ap_suspend_flag;
103 /* Maximum domain id */
104 static int ap_max_domain_id;
105 /* Flag to check if domain was set through module parameter domain=. This is
106 * important when supsend and resume is done in a z/VM environment where the
107 * domain might change. */
108 static int user_set_domain = 0;
109 static struct bus_type ap_bus_type;
111 /* Adapter interrupt definitions */
112 static void ap_interrupt_handler(struct airq_struct *airq);
114 static int ap_airq_flag;
116 static struct airq_struct ap_airq = {
117 .handler = ap_interrupt_handler,
122 * ap_using_interrupts() - Returns non-zero if interrupt support is
125 static inline int ap_using_interrupts(void)
131 * ap_intructions_available() - Test if AP instructions are available.
133 * Returns 0 if the AP instructions are installed.
135 static inline int ap_instructions_available(void)
137 register unsigned long reg0 asm ("0") = AP_MKQID(0,0);
138 register unsigned long reg1 asm ("1") = -ENODEV;
139 register unsigned long reg2 asm ("2") = 0UL;
142 " .long 0xb2af0000\n" /* PQAP(TAPQ) */
146 : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" );
151 * ap_interrupts_available(): Test if AP interrupts are available.
153 * Returns 1 if AP interrupts are available.
155 static int ap_interrupts_available(void)
157 return test_facility(65);
161 * ap_configuration_available(): Test if AP configuration
162 * information is available.
164 * Returns 1 if AP configuration information is available.
166 static int ap_configuration_available(void)
168 return test_facility(12);
172 * ap_test_queue(): Test adjunct processor queue.
173 * @qid: The AP queue number
174 * @info: Pointer to queue descriptor
176 * Returns AP queue status structure.
178 static inline struct ap_queue_status
179 ap_test_queue(ap_qid_t qid, unsigned long *info)
181 register unsigned long reg0 asm ("0") = qid;
182 register struct ap_queue_status reg1 asm ("1");
183 register unsigned long reg2 asm ("2") = 0UL;
185 if (test_facility(15))
186 reg0 |= 1UL << 23; /* set APFT T bit*/
187 asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
188 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
195 * ap_reset_queue(): Reset adjunct processor queue.
196 * @qid: The AP queue number
198 * Returns AP queue status structure.
200 static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid)
202 register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
203 register struct ap_queue_status reg1 asm ("1");
204 register unsigned long reg2 asm ("2") = 0UL;
207 ".long 0xb2af0000" /* PQAP(RAPQ) */
208 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
213 * ap_queue_interruption_control(): Enable interruption for a specific AP.
214 * @qid: The AP queue number
215 * @ind: The notification indicator byte
217 * Returns AP queue status.
219 static inline struct ap_queue_status
220 ap_queue_interruption_control(ap_qid_t qid, void *ind)
222 register unsigned long reg0 asm ("0") = qid | 0x03000000UL;
223 register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC;
224 register struct ap_queue_status reg1_out asm ("1");
225 register void *reg2 asm ("2") = ind;
227 ".long 0xb2af0000" /* PQAP(AQIC) */
228 : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)
235 * ap_query_configuration(): Get AP configuration data
237 * Returns 0 on success, or -EOPNOTSUPP.
239 static inline int ap_query_configuration(void)
241 register unsigned long reg0 asm ("0") = 0x04000000UL;
242 register unsigned long reg1 asm ("1") = -EINVAL;
243 register void *reg2 asm ("2") = (void *) ap_configuration;
245 if (!ap_configuration)
248 ".long 0xb2af0000\n" /* PQAP(QCI) */
252 : "+d" (reg0), "+d" (reg1), "+d" (reg2)
260 * ap_init_configuration(): Allocate and query configuration array.
262 static void ap_init_configuration(void)
264 if (!ap_configuration_available())
267 ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL);
268 if (!ap_configuration)
270 if (ap_query_configuration() != 0) {
271 kfree(ap_configuration);
272 ap_configuration = NULL;
278 * ap_test_config(): helper function to extract the nrth bit
279 * within the unsigned int array field.
281 static inline int ap_test_config(unsigned int *field, unsigned int nr)
283 return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
287 * ap_test_config_card_id(): Test, whether an AP card ID is configured.
290 * Returns 0 if the card is not configured
291 * 1 if the card is configured or
292 * if the configuration information is not available
294 static inline int ap_test_config_card_id(unsigned int id)
296 if (!ap_configuration) /* QCI not supported */
298 return ap_test_config(ap_configuration->apm, id);
302 * ap_test_config_domain(): Test, whether an AP usage domain is configured.
303 * @domain AP usage domain ID
305 * Returns 0 if the usage domain is not configured
306 * 1 if the usage domain is configured or
307 * if the configuration information is not available
309 static inline int ap_test_config_domain(unsigned int domain)
311 if (!ap_configuration) /* QCI not supported */
313 return ap_test_config(ap_configuration->aqm, domain);
317 * ap_queue_enable_interruption(): Enable interruption on an AP.
318 * @qid: The AP queue number
319 * @ind: the notification indicator byte
321 * Enables interruption on AP queue via ap_queue_interruption_control(). Based
322 * on the return value it waits a while and tests the AP queue if interrupts
323 * have been switched on using ap_test_queue().
325 static int ap_queue_enable_interruption(struct ap_device *ap_dev, void *ind)
327 struct ap_queue_status status;
329 status = ap_queue_interruption_control(ap_dev->qid, ind);
330 switch (status.response_code) {
331 case AP_RESPONSE_NORMAL:
332 case AP_RESPONSE_OTHERWISE_CHANGED:
334 case AP_RESPONSE_Q_NOT_AVAIL:
335 case AP_RESPONSE_DECONFIGURED:
336 case AP_RESPONSE_CHECKSTOPPED:
337 case AP_RESPONSE_INVALID_ADDRESS:
338 pr_err("Registering adapter interrupts for AP %d failed\n",
339 AP_QID_DEVICE(ap_dev->qid));
341 case AP_RESPONSE_RESET_IN_PROGRESS:
342 case AP_RESPONSE_BUSY:
349 * __ap_send(): Send message to adjunct processor queue.
350 * @qid: The AP queue number
351 * @psmid: The program supplied message identifier
352 * @msg: The message text
353 * @length: The message length
354 * @special: Special Bit
356 * Returns AP queue status structure.
357 * Condition code 1 on NQAP can't happen because the L bit is 1.
358 * Condition code 2 on NQAP also means the send is incomplete,
359 * because a segment boundary was reached. The NQAP is repeated.
361 static inline struct ap_queue_status
362 __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length,
363 unsigned int special)
365 typedef struct { char _[length]; } msgblock;
366 register unsigned long reg0 asm ("0") = qid | 0x40000000UL;
367 register struct ap_queue_status reg1 asm ("1");
368 register unsigned long reg2 asm ("2") = (unsigned long) msg;
369 register unsigned long reg3 asm ("3") = (unsigned long) length;
370 register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32);
371 register unsigned long reg5 asm ("5") = psmid & 0xffffffff;
377 "0: .long 0xb2ad0042\n" /* NQAP */
379 : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3)
380 : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg)
385 int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
387 struct ap_queue_status status;
389 status = __ap_send(qid, psmid, msg, length, 0);
390 switch (status.response_code) {
391 case AP_RESPONSE_NORMAL:
393 case AP_RESPONSE_Q_FULL:
394 case AP_RESPONSE_RESET_IN_PROGRESS:
396 case AP_RESPONSE_REQ_FAC_NOT_INST:
398 default: /* Device is gone. */
402 EXPORT_SYMBOL(ap_send);
405 * __ap_recv(): Receive message from adjunct processor queue.
406 * @qid: The AP queue number
407 * @psmid: Pointer to program supplied message identifier
408 * @msg: The message text
409 * @length: The message length
411 * Returns AP queue status structure.
412 * Condition code 1 on DQAP means the receive has taken place
413 * but only partially. The response is incomplete, hence the
415 * Condition code 2 on DQAP also means the receive is incomplete,
416 * this time because a segment boundary was reached. Again, the
418 * Note that gpr2 is used by the DQAP instruction to keep track of
419 * any 'residual' length, in case the instruction gets interrupted.
420 * Hence it gets zeroed before the instruction.
422 static inline struct ap_queue_status
423 __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
425 typedef struct { char _[length]; } msgblock;
426 register unsigned long reg0 asm("0") = qid | 0x80000000UL;
427 register struct ap_queue_status reg1 asm ("1");
428 register unsigned long reg2 asm("2") = 0UL;
429 register unsigned long reg4 asm("4") = (unsigned long) msg;
430 register unsigned long reg5 asm("5") = (unsigned long) length;
431 register unsigned long reg6 asm("6") = 0UL;
432 register unsigned long reg7 asm("7") = 0UL;
436 "0: .long 0xb2ae0064\n" /* DQAP */
438 : "+d" (reg0), "=d" (reg1), "+d" (reg2),
439 "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7),
440 "=m" (*(msgblock *) msg) : : "cc" );
441 *psmid = (((unsigned long long) reg6) << 32) + reg7;
445 int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
447 struct ap_queue_status status;
449 status = __ap_recv(qid, psmid, msg, length);
450 switch (status.response_code) {
451 case AP_RESPONSE_NORMAL:
453 case AP_RESPONSE_NO_PENDING_REPLY:
454 if (status.queue_empty)
457 case AP_RESPONSE_RESET_IN_PROGRESS:
463 EXPORT_SYMBOL(ap_recv);
466 * ap_query_queue(): Check if an AP queue is available.
467 * @qid: The AP queue number
468 * @queue_depth: Pointer to queue depth value
469 * @device_type: Pointer to device type value
470 * @facilities: Pointer to facility indicator
472 static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type,
473 unsigned int *facilities)
475 struct ap_queue_status status;
479 if (!ap_test_config_card_id(AP_QID_DEVICE(qid)))
482 status = ap_test_queue(qid, &info);
483 switch (status.response_code) {
484 case AP_RESPONSE_NORMAL:
485 *queue_depth = (int)(info & 0xff);
486 *device_type = (int)((info >> 24) & 0xff);
487 *facilities = (unsigned int)(info >> 32);
488 /* Update maximum domain id */
489 nd = (info >> 16) & 0xff;
490 if ((info & (1UL << 57)) && nd > 0)
491 ap_max_domain_id = nd;
493 case AP_RESPONSE_Q_NOT_AVAIL:
494 case AP_RESPONSE_DECONFIGURED:
495 case AP_RESPONSE_CHECKSTOPPED:
496 case AP_RESPONSE_INVALID_ADDRESS:
498 case AP_RESPONSE_RESET_IN_PROGRESS:
499 case AP_RESPONSE_OTHERWISE_CHANGED:
500 case AP_RESPONSE_BUSY:
507 /* State machine definitions and helpers */
509 static void ap_sm_wait(enum ap_wait wait)
515 case AP_WAIT_INTERRUPT:
516 if (ap_using_interrupts())
518 if (ap_poll_kthread) {
519 wake_up(&ap_poll_wait);
523 case AP_WAIT_TIMEOUT:
524 spin_lock_bh(&ap_poll_timer_lock);
525 if (!hrtimer_is_queued(&ap_poll_timer)) {
526 hr_time = ktime_set(0, poll_timeout);
527 hrtimer_forward_now(&ap_poll_timer, hr_time);
528 hrtimer_restart(&ap_poll_timer);
530 spin_unlock_bh(&ap_poll_timer_lock);
538 static enum ap_wait ap_sm_nop(struct ap_device *ap_dev)
544 * ap_sm_recv(): Receive pending reply messages from an AP device but do
545 * not change the state of the device.
546 * @ap_dev: pointer to the AP device
548 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
550 static struct ap_queue_status ap_sm_recv(struct ap_device *ap_dev)
552 struct ap_queue_status status;
553 struct ap_message *ap_msg;
555 status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid,
556 ap_dev->reply->message, ap_dev->reply->length);
557 switch (status.response_code) {
558 case AP_RESPONSE_NORMAL:
559 atomic_dec(&ap_poll_requests);
560 ap_dev->queue_count--;
561 if (ap_dev->queue_count > 0)
562 mod_timer(&ap_dev->timeout,
563 jiffies + ap_dev->drv->request_timeout);
564 list_for_each_entry(ap_msg, &ap_dev->pendingq, list) {
565 if (ap_msg->psmid != ap_dev->reply->psmid)
567 list_del_init(&ap_msg->list);
568 ap_dev->pendingq_count--;
569 ap_msg->receive(ap_dev, ap_msg, ap_dev->reply);
572 case AP_RESPONSE_NO_PENDING_REPLY:
573 if (!status.queue_empty || ap_dev->queue_count <= 0)
575 /* The card shouldn't forget requests but who knows. */
576 atomic_sub(ap_dev->queue_count, &ap_poll_requests);
577 ap_dev->queue_count = 0;
578 list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
579 ap_dev->requestq_count += ap_dev->pendingq_count;
580 ap_dev->pendingq_count = 0;
589 * ap_sm_read(): Receive pending reply messages from an AP device.
590 * @ap_dev: pointer to the AP device
592 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
594 static enum ap_wait ap_sm_read(struct ap_device *ap_dev)
596 struct ap_queue_status status;
598 status = ap_sm_recv(ap_dev);
599 switch (status.response_code) {
600 case AP_RESPONSE_NORMAL:
601 if (ap_dev->queue_count > 0)
602 return AP_WAIT_AGAIN;
603 ap_dev->state = AP_STATE_IDLE;
605 case AP_RESPONSE_NO_PENDING_REPLY:
606 if (ap_dev->queue_count > 0)
607 return AP_WAIT_INTERRUPT;
608 ap_dev->state = AP_STATE_IDLE;
611 ap_dev->state = AP_STATE_BORKED;
617 * ap_sm_write(): Send messages from the request queue to an AP device.
618 * @ap_dev: pointer to the AP device
620 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
622 static enum ap_wait ap_sm_write(struct ap_device *ap_dev)
624 struct ap_queue_status status;
625 struct ap_message *ap_msg;
627 if (ap_dev->requestq_count <= 0)
629 /* Start the next request on the queue. */
630 ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list);
631 status = __ap_send(ap_dev->qid, ap_msg->psmid,
632 ap_msg->message, ap_msg->length, ap_msg->special);
633 switch (status.response_code) {
634 case AP_RESPONSE_NORMAL:
635 atomic_inc(&ap_poll_requests);
636 ap_dev->queue_count++;
637 if (ap_dev->queue_count == 1)
638 mod_timer(&ap_dev->timeout,
639 jiffies + ap_dev->drv->request_timeout);
640 list_move_tail(&ap_msg->list, &ap_dev->pendingq);
641 ap_dev->requestq_count--;
642 ap_dev->pendingq_count++;
643 if (ap_dev->queue_count < ap_dev->queue_depth) {
644 ap_dev->state = AP_STATE_WORKING;
645 return AP_WAIT_AGAIN;
648 case AP_RESPONSE_Q_FULL:
649 ap_dev->state = AP_STATE_QUEUE_FULL;
650 return AP_WAIT_INTERRUPT;
651 case AP_RESPONSE_RESET_IN_PROGRESS:
652 ap_dev->state = AP_STATE_RESET_WAIT;
653 return AP_WAIT_TIMEOUT;
654 case AP_RESPONSE_MESSAGE_TOO_BIG:
655 case AP_RESPONSE_REQ_FAC_NOT_INST:
656 list_del_init(&ap_msg->list);
657 ap_dev->requestq_count--;
658 ap_msg->rc = -EINVAL;
659 ap_msg->receive(ap_dev, ap_msg, NULL);
660 return AP_WAIT_AGAIN;
662 ap_dev->state = AP_STATE_BORKED;
668 * ap_sm_read_write(): Send and receive messages to/from an AP device.
669 * @ap_dev: pointer to the AP device
671 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
673 static enum ap_wait ap_sm_read_write(struct ap_device *ap_dev)
675 return min(ap_sm_read(ap_dev), ap_sm_write(ap_dev));
679 * ap_sm_reset(): Reset an AP queue.
680 * @qid: The AP queue number
682 * Submit the Reset command to an AP queue.
684 static enum ap_wait ap_sm_reset(struct ap_device *ap_dev)
686 struct ap_queue_status status;
688 status = ap_reset_queue(ap_dev->qid);
689 switch (status.response_code) {
690 case AP_RESPONSE_NORMAL:
691 case AP_RESPONSE_RESET_IN_PROGRESS:
692 ap_dev->state = AP_STATE_RESET_WAIT;
693 ap_dev->interrupt = AP_INTR_DISABLED;
694 return AP_WAIT_TIMEOUT;
695 case AP_RESPONSE_BUSY:
696 return AP_WAIT_TIMEOUT;
697 case AP_RESPONSE_Q_NOT_AVAIL:
698 case AP_RESPONSE_DECONFIGURED:
699 case AP_RESPONSE_CHECKSTOPPED:
701 ap_dev->state = AP_STATE_BORKED;
707 * ap_sm_reset_wait(): Test queue for completion of the reset operation
708 * @ap_dev: pointer to the AP device
710 * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
712 static enum ap_wait ap_sm_reset_wait(struct ap_device *ap_dev)
714 struct ap_queue_status status;
717 if (ap_dev->queue_count > 0)
718 /* Try to read a completed message and get the status */
719 status = ap_sm_recv(ap_dev);
721 /* Get the status with TAPQ */
722 status = ap_test_queue(ap_dev->qid, &info);
724 switch (status.response_code) {
725 case AP_RESPONSE_NORMAL:
726 if (ap_using_interrupts() &&
727 ap_queue_enable_interruption(ap_dev,
728 ap_airq.lsi_ptr) == 0)
729 ap_dev->state = AP_STATE_SETIRQ_WAIT;
731 ap_dev->state = (ap_dev->queue_count > 0) ?
732 AP_STATE_WORKING : AP_STATE_IDLE;
733 return AP_WAIT_AGAIN;
734 case AP_RESPONSE_BUSY:
735 case AP_RESPONSE_RESET_IN_PROGRESS:
736 return AP_WAIT_TIMEOUT;
737 case AP_RESPONSE_Q_NOT_AVAIL:
738 case AP_RESPONSE_DECONFIGURED:
739 case AP_RESPONSE_CHECKSTOPPED:
741 ap_dev->state = AP_STATE_BORKED;
747 * ap_sm_setirq_wait(): Test queue for completion of the irq enablement
748 * @ap_dev: pointer to the AP device
750 * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
752 static enum ap_wait ap_sm_setirq_wait(struct ap_device *ap_dev)
754 struct ap_queue_status status;
757 if (ap_dev->queue_count > 0)
758 /* Try to read a completed message and get the status */
759 status = ap_sm_recv(ap_dev);
761 /* Get the status with TAPQ */
762 status = ap_test_queue(ap_dev->qid, &info);
764 if (status.int_enabled == 1) {
765 /* Irqs are now enabled */
766 ap_dev->interrupt = AP_INTR_ENABLED;
767 ap_dev->state = (ap_dev->queue_count > 0) ?
768 AP_STATE_WORKING : AP_STATE_IDLE;
771 switch (status.response_code) {
772 case AP_RESPONSE_NORMAL:
773 if (ap_dev->queue_count > 0)
774 return AP_WAIT_AGAIN;
776 case AP_RESPONSE_NO_PENDING_REPLY:
777 return AP_WAIT_TIMEOUT;
779 ap_dev->state = AP_STATE_BORKED;
785 * AP state machine jump table
787 ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = {
788 [AP_STATE_RESET_START] = {
789 [AP_EVENT_POLL] = ap_sm_reset,
790 [AP_EVENT_TIMEOUT] = ap_sm_nop,
792 [AP_STATE_RESET_WAIT] = {
793 [AP_EVENT_POLL] = ap_sm_reset_wait,
794 [AP_EVENT_TIMEOUT] = ap_sm_nop,
796 [AP_STATE_SETIRQ_WAIT] = {
797 [AP_EVENT_POLL] = ap_sm_setirq_wait,
798 [AP_EVENT_TIMEOUT] = ap_sm_nop,
801 [AP_EVENT_POLL] = ap_sm_write,
802 [AP_EVENT_TIMEOUT] = ap_sm_nop,
804 [AP_STATE_WORKING] = {
805 [AP_EVENT_POLL] = ap_sm_read_write,
806 [AP_EVENT_TIMEOUT] = ap_sm_reset,
808 [AP_STATE_QUEUE_FULL] = {
809 [AP_EVENT_POLL] = ap_sm_read,
810 [AP_EVENT_TIMEOUT] = ap_sm_reset,
812 [AP_STATE_SUSPEND_WAIT] = {
813 [AP_EVENT_POLL] = ap_sm_read,
814 [AP_EVENT_TIMEOUT] = ap_sm_nop,
816 [AP_STATE_BORKED] = {
817 [AP_EVENT_POLL] = ap_sm_nop,
818 [AP_EVENT_TIMEOUT] = ap_sm_nop,
822 static inline enum ap_wait ap_sm_event(struct ap_device *ap_dev,
825 return ap_jumptable[ap_dev->state][event](ap_dev);
828 static inline enum ap_wait ap_sm_event_loop(struct ap_device *ap_dev,
833 while ((wait = ap_sm_event(ap_dev, event)) == AP_WAIT_AGAIN)
839 * ap_request_timeout(): Handling of request timeouts
840 * @data: Holds the AP device.
842 * Handles request timeouts.
844 static void ap_request_timeout(unsigned long data)
846 struct ap_device *ap_dev = (struct ap_device *) data;
850 spin_lock_bh(&ap_dev->lock);
851 ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_TIMEOUT));
852 spin_unlock_bh(&ap_dev->lock);
856 * ap_poll_timeout(): AP receive polling for finished AP requests.
857 * @unused: Unused pointer.
859 * Schedules the AP tasklet using a high resolution timer.
861 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
863 if (!ap_suspend_flag)
864 tasklet_schedule(&ap_tasklet);
865 return HRTIMER_NORESTART;
869 * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
870 * @airq: pointer to adapter interrupt descriptor
872 static void ap_interrupt_handler(struct airq_struct *airq)
874 inc_irq_stat(IRQIO_APB);
875 if (!ap_suspend_flag)
876 tasklet_schedule(&ap_tasklet);
880 * ap_tasklet_fn(): Tasklet to poll all AP devices.
881 * @dummy: Unused variable
883 * Poll all AP devices on the bus.
885 static void ap_tasklet_fn(unsigned long dummy)
887 struct ap_device *ap_dev;
888 enum ap_wait wait = AP_WAIT_NONE;
890 /* Reset the indicator if interrupts are used. Thus new interrupts can
891 * be received. Doing it in the beginning of the tasklet is therefor
892 * important that no requests on any AP get lost.
894 if (ap_using_interrupts())
895 xchg(ap_airq.lsi_ptr, 0);
897 spin_lock(&ap_device_list_lock);
898 list_for_each_entry(ap_dev, &ap_device_list, list) {
899 spin_lock_bh(&ap_dev->lock);
900 wait = min(wait, ap_sm_event_loop(ap_dev, AP_EVENT_POLL));
901 spin_unlock_bh(&ap_dev->lock);
903 spin_unlock(&ap_device_list_lock);
908 * ap_poll_thread(): Thread that polls for finished requests.
909 * @data: Unused pointer
911 * AP bus poll thread. The purpose of this thread is to poll for
912 * finished requests in a loop if there is a "free" cpu - that is
913 * a cpu that doesn't have anything better to do. The polling stops
914 * as soon as there is another task or if all messages have been
917 static int ap_poll_thread(void *data)
919 DECLARE_WAITQUEUE(wait, current);
921 set_user_nice(current, MAX_NICE);
923 while (!kthread_should_stop()) {
924 add_wait_queue(&ap_poll_wait, &wait);
925 set_current_state(TASK_INTERRUPTIBLE);
926 if (ap_suspend_flag ||
927 atomic_read(&ap_poll_requests) <= 0) {
931 set_current_state(TASK_RUNNING);
932 remove_wait_queue(&ap_poll_wait, &wait);
933 if (need_resched()) {
939 } while (!kthread_should_stop());
943 static int ap_poll_thread_start(void)
947 if (ap_using_interrupts() || ap_poll_kthread)
949 mutex_lock(&ap_poll_thread_mutex);
950 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
951 rc = PTR_RET(ap_poll_kthread);
953 ap_poll_kthread = NULL;
954 mutex_unlock(&ap_poll_thread_mutex);
958 static void ap_poll_thread_stop(void)
960 if (!ap_poll_kthread)
962 mutex_lock(&ap_poll_thread_mutex);
963 kthread_stop(ap_poll_kthread);
964 ap_poll_kthread = NULL;
965 mutex_unlock(&ap_poll_thread_mutex);
969 * ap_queue_message(): Queue a request to an AP device.
970 * @ap_dev: The AP device to queue the message to
971 * @ap_msg: The message that is to be added
973 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
975 /* For asynchronous message handling a valid receive-callback
977 BUG_ON(!ap_msg->receive);
979 spin_lock_bh(&ap_dev->lock);
980 /* Queue the message. */
981 list_add_tail(&ap_msg->list, &ap_dev->requestq);
982 ap_dev->requestq_count++;
983 ap_dev->total_request_count++;
984 /* Send/receive as many request from the queue as possible. */
985 ap_sm_wait(ap_sm_event_loop(ap_dev, AP_EVENT_POLL));
986 spin_unlock_bh(&ap_dev->lock);
988 EXPORT_SYMBOL(ap_queue_message);
991 * ap_cancel_message(): Cancel a crypto request.
992 * @ap_dev: The AP device that has the message queued
993 * @ap_msg: The message that is to be removed
995 * Cancel a crypto request. This is done by removing the request
996 * from the device pending or request queue. Note that the
997 * request stays on the AP queue. When it finishes the message
998 * reply will be discarded because the psmid can't be found.
1000 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
1002 struct ap_message *tmp;
1004 spin_lock_bh(&ap_dev->lock);
1005 if (!list_empty(&ap_msg->list)) {
1006 list_for_each_entry(tmp, &ap_dev->pendingq, list)
1007 if (tmp->psmid == ap_msg->psmid) {
1008 ap_dev->pendingq_count--;
1011 ap_dev->requestq_count--;
1013 list_del_init(&ap_msg->list);
1015 spin_unlock_bh(&ap_dev->lock);
1017 EXPORT_SYMBOL(ap_cancel_message);
1020 * AP device related attributes.
1022 static ssize_t ap_hwtype_show(struct device *dev,
1023 struct device_attribute *attr, char *buf)
1025 struct ap_device *ap_dev = to_ap_dev(dev);
1026 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type);
1029 static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
1031 static ssize_t ap_raw_hwtype_show(struct device *dev,
1032 struct device_attribute *attr, char *buf)
1034 struct ap_device *ap_dev = to_ap_dev(dev);
1036 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->raw_hwtype);
1039 static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL);
1041 static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
1044 struct ap_device *ap_dev = to_ap_dev(dev);
1045 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth);
1048 static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
1049 static ssize_t ap_request_count_show(struct device *dev,
1050 struct device_attribute *attr,
1053 struct ap_device *ap_dev = to_ap_dev(dev);
1056 spin_lock_bh(&ap_dev->lock);
1057 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count);
1058 spin_unlock_bh(&ap_dev->lock);
1062 static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL);
1064 static ssize_t ap_requestq_count_show(struct device *dev,
1065 struct device_attribute *attr, char *buf)
1067 struct ap_device *ap_dev = to_ap_dev(dev);
1070 spin_lock_bh(&ap_dev->lock);
1071 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->requestq_count);
1072 spin_unlock_bh(&ap_dev->lock);
1076 static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
1078 static ssize_t ap_pendingq_count_show(struct device *dev,
1079 struct device_attribute *attr, char *buf)
1081 struct ap_device *ap_dev = to_ap_dev(dev);
1084 spin_lock_bh(&ap_dev->lock);
1085 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->pendingq_count);
1086 spin_unlock_bh(&ap_dev->lock);
1090 static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
1092 static ssize_t ap_reset_show(struct device *dev,
1093 struct device_attribute *attr, char *buf)
1095 struct ap_device *ap_dev = to_ap_dev(dev);
1098 spin_lock_bh(&ap_dev->lock);
1099 switch (ap_dev->state) {
1100 case AP_STATE_RESET_START:
1101 case AP_STATE_RESET_WAIT:
1102 rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n");
1104 case AP_STATE_WORKING:
1105 case AP_STATE_QUEUE_FULL:
1106 rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n");
1109 rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n");
1111 spin_unlock_bh(&ap_dev->lock);
1115 static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL);
1117 static ssize_t ap_interrupt_show(struct device *dev,
1118 struct device_attribute *attr, char *buf)
1120 struct ap_device *ap_dev = to_ap_dev(dev);
1123 spin_lock_bh(&ap_dev->lock);
1124 if (ap_dev->state == AP_STATE_SETIRQ_WAIT)
1125 rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n");
1126 else if (ap_dev->interrupt == AP_INTR_ENABLED)
1127 rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n");
1129 rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n");
1130 spin_unlock_bh(&ap_dev->lock);
1134 static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL);
1136 static ssize_t ap_modalias_show(struct device *dev,
1137 struct device_attribute *attr, char *buf)
1139 return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
1142 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
1144 static ssize_t ap_functions_show(struct device *dev,
1145 struct device_attribute *attr, char *buf)
1147 struct ap_device *ap_dev = to_ap_dev(dev);
1148 return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions);
1151 static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL);
1153 static struct attribute *ap_dev_attrs[] = {
1154 &dev_attr_hwtype.attr,
1155 &dev_attr_raw_hwtype.attr,
1156 &dev_attr_depth.attr,
1157 &dev_attr_request_count.attr,
1158 &dev_attr_requestq_count.attr,
1159 &dev_attr_pendingq_count.attr,
1160 &dev_attr_reset.attr,
1161 &dev_attr_interrupt.attr,
1162 &dev_attr_modalias.attr,
1163 &dev_attr_ap_functions.attr,
1166 static struct attribute_group ap_dev_attr_group = {
1167 .attrs = ap_dev_attrs
1172 * @dev: Pointer to device
1173 * @drv: Pointer to device_driver
1175 * AP bus driver registration/unregistration.
1177 static int ap_bus_match(struct device *dev, struct device_driver *drv)
1179 struct ap_device *ap_dev = to_ap_dev(dev);
1180 struct ap_driver *ap_drv = to_ap_drv(drv);
1181 struct ap_device_id *id;
1184 * Compare device type of the device with the list of
1185 * supported types of the device_driver.
1187 for (id = ap_drv->ids; id->match_flags; id++) {
1188 if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) &&
1189 (id->dev_type != ap_dev->device_type))
1197 * ap_uevent(): Uevent function for AP devices.
1198 * @dev: Pointer to device
1199 * @env: Pointer to kobj_uevent_env
1201 * It sets up a single environment variable DEV_TYPE which contains the
1202 * hardware device type.
1204 static int ap_uevent (struct device *dev, struct kobj_uevent_env *env)
1206 struct ap_device *ap_dev = to_ap_dev(dev);
1212 /* Set up DEV_TYPE environment variable. */
1213 retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
1218 retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
1223 static int ap_dev_suspend(struct device *dev, pm_message_t state)
1225 struct ap_device *ap_dev = to_ap_dev(dev);
1227 /* Poll on the device until all requests are finished. */
1228 spin_lock_bh(&ap_dev->lock);
1229 ap_dev->state = AP_STATE_SUSPEND_WAIT;
1230 while (ap_sm_event(ap_dev, AP_EVENT_POLL) != AP_WAIT_NONE)
1232 ap_dev->state = AP_STATE_BORKED;
1233 spin_unlock_bh(&ap_dev->lock);
1237 static int ap_dev_resume(struct device *dev)
1242 static void ap_bus_suspend(void)
1244 ap_suspend_flag = 1;
1246 * Disable scanning for devices, thus we do not want to scan
1247 * for them after removing.
1249 flush_work(&ap_scan_work);
1250 tasklet_disable(&ap_tasklet);
1253 static int __ap_devices_unregister(struct device *dev, void *dummy)
1255 device_unregister(dev);
1259 static void ap_bus_resume(void)
1263 /* Unconditionally remove all AP devices */
1264 bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister);
1265 /* Reset thin interrupt setting */
1266 if (ap_interrupts_available() && !ap_using_interrupts()) {
1267 rc = register_adapter_interrupt(&ap_airq);
1268 ap_airq_flag = (rc == 0);
1270 if (!ap_interrupts_available() && ap_using_interrupts()) {
1271 unregister_adapter_interrupt(&ap_airq);
1275 if (!user_set_domain)
1276 ap_domain_index = -1;
1277 /* Get things going again */
1278 ap_suspend_flag = 0;
1280 xchg(ap_airq.lsi_ptr, 0);
1281 tasklet_enable(&ap_tasklet);
1282 queue_work(system_long_wq, &ap_scan_work);
1285 static int ap_power_event(struct notifier_block *this, unsigned long event,
1289 case PM_HIBERNATION_PREPARE:
1290 case PM_SUSPEND_PREPARE:
1293 case PM_POST_HIBERNATION:
1294 case PM_POST_SUSPEND:
1302 static struct notifier_block ap_power_notifier = {
1303 .notifier_call = ap_power_event,
1306 static struct bus_type ap_bus_type = {
1308 .match = &ap_bus_match,
1309 .uevent = &ap_uevent,
1310 .suspend = ap_dev_suspend,
1311 .resume = ap_dev_resume,
1314 static int ap_device_probe(struct device *dev)
1316 struct ap_device *ap_dev = to_ap_dev(dev);
1317 struct ap_driver *ap_drv = to_ap_drv(dev->driver);
1320 ap_dev->drv = ap_drv;
1321 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
1328 * __ap_flush_queue(): Flush requests.
1329 * @ap_dev: Pointer to the AP device
1331 * Flush all requests from the request/pending queue of an AP device.
1333 static void __ap_flush_queue(struct ap_device *ap_dev)
1335 struct ap_message *ap_msg, *next;
1337 list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) {
1338 list_del_init(&ap_msg->list);
1339 ap_dev->pendingq_count--;
1340 ap_msg->rc = -EAGAIN;
1341 ap_msg->receive(ap_dev, ap_msg, NULL);
1343 list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) {
1344 list_del_init(&ap_msg->list);
1345 ap_dev->requestq_count--;
1346 ap_msg->rc = -EAGAIN;
1347 ap_msg->receive(ap_dev, ap_msg, NULL);
1351 void ap_flush_queue(struct ap_device *ap_dev)
1353 spin_lock_bh(&ap_dev->lock);
1354 __ap_flush_queue(ap_dev);
1355 spin_unlock_bh(&ap_dev->lock);
1357 EXPORT_SYMBOL(ap_flush_queue);
1359 static int ap_device_remove(struct device *dev)
1361 struct ap_device *ap_dev = to_ap_dev(dev);
1362 struct ap_driver *ap_drv = ap_dev->drv;
1364 ap_flush_queue(ap_dev);
1365 del_timer_sync(&ap_dev->timeout);
1366 spin_lock_bh(&ap_device_list_lock);
1367 list_del_init(&ap_dev->list);
1368 spin_unlock_bh(&ap_device_list_lock);
1370 ap_drv->remove(ap_dev);
1371 spin_lock_bh(&ap_dev->lock);
1372 atomic_sub(ap_dev->queue_count, &ap_poll_requests);
1373 spin_unlock_bh(&ap_dev->lock);
1377 static void ap_device_release(struct device *dev)
1379 kfree(to_ap_dev(dev));
1382 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
1385 struct device_driver *drv = &ap_drv->driver;
1387 drv->bus = &ap_bus_type;
1388 drv->probe = ap_device_probe;
1389 drv->remove = ap_device_remove;
1392 return driver_register(drv);
1394 EXPORT_SYMBOL(ap_driver_register);
1396 void ap_driver_unregister(struct ap_driver *ap_drv)
1398 driver_unregister(&ap_drv->driver);
1400 EXPORT_SYMBOL(ap_driver_unregister);
1402 void ap_bus_force_rescan(void)
1404 if (ap_suspend_flag)
1406 /* processing a asynchronous bus rescan */
1407 del_timer(&ap_config_timer);
1408 queue_work(system_long_wq, &ap_scan_work);
1409 flush_work(&ap_scan_work);
1411 EXPORT_SYMBOL(ap_bus_force_rescan);
1414 * AP bus attributes.
1416 static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
1418 return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
1421 static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL);
1423 static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
1425 if (!ap_configuration) /* QCI not supported */
1426 return snprintf(buf, PAGE_SIZE, "not supported\n");
1427 if (!test_facility(76))
1428 /* format 0 - 16 bit domain field */
1429 return snprintf(buf, PAGE_SIZE, "%08x%08x\n",
1430 ap_configuration->adm[0],
1431 ap_configuration->adm[1]);
1432 /* format 1 - 256 bit domain field */
1433 return snprintf(buf, PAGE_SIZE,
1434 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1435 ap_configuration->adm[0], ap_configuration->adm[1],
1436 ap_configuration->adm[2], ap_configuration->adm[3],
1437 ap_configuration->adm[4], ap_configuration->adm[5],
1438 ap_configuration->adm[6], ap_configuration->adm[7]);
1441 static BUS_ATTR(ap_control_domain_mask, 0444,
1442 ap_control_domain_mask_show, NULL);
1444 static ssize_t ap_config_time_show(struct bus_type *bus, char *buf)
1446 return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
1449 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
1451 return snprintf(buf, PAGE_SIZE, "%d\n",
1452 ap_using_interrupts() ? 1 : 0);
1455 static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL);
1457 static ssize_t ap_config_time_store(struct bus_type *bus,
1458 const char *buf, size_t count)
1462 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
1464 ap_config_time = time;
1465 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1469 static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store);
1471 static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf)
1473 return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
1476 static ssize_t ap_poll_thread_store(struct bus_type *bus,
1477 const char *buf, size_t count)
1481 if (sscanf(buf, "%d\n", &flag) != 1)
1484 rc = ap_poll_thread_start();
1488 ap_poll_thread_stop();
1492 static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store);
1494 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
1496 return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
1499 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
1502 unsigned long long time;
1505 /* 120 seconds = maximum poll interval */
1506 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
1507 time > 120000000000ULL)
1509 poll_timeout = time;
1510 hr_time = ktime_set(0, poll_timeout);
1512 spin_lock_bh(&ap_poll_timer_lock);
1513 hrtimer_cancel(&ap_poll_timer);
1514 hrtimer_set_expires(&ap_poll_timer, hr_time);
1515 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
1516 spin_unlock_bh(&ap_poll_timer_lock);
1521 static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
1523 static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
1527 if (ap_configuration)
1528 max_domain_id = ap_max_domain_id ? : -1;
1531 return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id);
1534 static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL);
1536 static struct bus_attribute *const ap_bus_attrs[] = {
1537 &bus_attr_ap_domain,
1538 &bus_attr_ap_control_domain_mask,
1539 &bus_attr_config_time,
1540 &bus_attr_poll_thread,
1541 &bus_attr_ap_interrupts,
1542 &bus_attr_poll_timeout,
1543 &bus_attr_ap_max_domain_id,
1548 * ap_select_domain(): Select an AP domain.
1550 * Pick one of the 16 AP domains.
1552 static int ap_select_domain(void)
1554 int count, max_count, best_domain;
1555 struct ap_queue_status status;
1559 * We want to use a single domain. Either the one specified with
1560 * the "domain=" parameter or the domain with the maximum number
1563 if (ap_domain_index >= 0)
1564 /* Domain has already been selected. */
1568 for (i = 0; i < AP_DOMAINS; i++) {
1569 if (!ap_test_config_domain(i))
1572 for (j = 0; j < AP_DEVICES; j++) {
1573 if (!ap_test_config_card_id(j))
1575 status = ap_test_queue(AP_MKQID(j, i), NULL);
1576 if (status.response_code != AP_RESPONSE_NORMAL)
1580 if (count > max_count) {
1585 if (best_domain >= 0){
1586 ap_domain_index = best_domain;
1593 * __ap_scan_bus(): Scan the AP bus.
1594 * @dev: Pointer to device
1595 * @data: Pointer to data
1597 * Scan the AP bus for new devices.
1599 static int __ap_scan_bus(struct device *dev, void *data)
1601 return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data;
1604 static void ap_scan_bus(struct work_struct *unused)
1606 struct ap_device *ap_dev;
1609 int queue_depth = 0, device_type = 0;
1610 unsigned int device_functions = 0;
1613 ap_query_configuration();
1614 if (ap_select_domain() != 0)
1617 for (i = 0; i < AP_DEVICES; i++) {
1618 qid = AP_MKQID(i, ap_domain_index);
1619 dev = bus_find_device(&ap_bus_type, NULL,
1620 (void *)(unsigned long)qid,
1622 rc = ap_query_queue(qid, &queue_depth, &device_type,
1625 ap_dev = to_ap_dev(dev);
1626 spin_lock_bh(&ap_dev->lock);
1628 ap_dev->state = AP_STATE_BORKED;
1629 borked = ap_dev->state == AP_STATE_BORKED;
1630 spin_unlock_bh(&ap_dev->lock);
1631 if (borked) /* Remove broken device */
1632 device_unregister(dev);
1639 ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL);
1643 ap_dev->state = AP_STATE_RESET_START;
1644 ap_dev->interrupt = AP_INTR_DISABLED;
1645 ap_dev->queue_depth = queue_depth;
1646 ap_dev->raw_hwtype = device_type;
1647 ap_dev->device_type = device_type;
1648 ap_dev->functions = device_functions;
1649 spin_lock_init(&ap_dev->lock);
1650 INIT_LIST_HEAD(&ap_dev->pendingq);
1651 INIT_LIST_HEAD(&ap_dev->requestq);
1652 INIT_LIST_HEAD(&ap_dev->list);
1653 setup_timer(&ap_dev->timeout, ap_request_timeout,
1654 (unsigned long) ap_dev);
1656 ap_dev->device.bus = &ap_bus_type;
1657 ap_dev->device.parent = ap_root_device;
1658 rc = dev_set_name(&ap_dev->device, "card%02x",
1659 AP_QID_DEVICE(ap_dev->qid));
1664 /* Add to list of devices */
1665 spin_lock_bh(&ap_device_list_lock);
1666 list_add(&ap_dev->list, &ap_device_list);
1667 spin_unlock_bh(&ap_device_list_lock);
1668 /* Start with a device reset */
1669 spin_lock_bh(&ap_dev->lock);
1670 ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL));
1671 spin_unlock_bh(&ap_dev->lock);
1672 /* Register device */
1673 ap_dev->device.release = ap_device_release;
1674 rc = device_register(&ap_dev->device);
1676 spin_lock_bh(&ap_dev->lock);
1677 list_del_init(&ap_dev->list);
1678 spin_unlock_bh(&ap_dev->lock);
1679 put_device(&ap_dev->device);
1682 /* Add device attributes. */
1683 rc = sysfs_create_group(&ap_dev->device.kobj,
1684 &ap_dev_attr_group);
1686 device_unregister(&ap_dev->device);
1691 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1694 static void ap_config_timeout(unsigned long ptr)
1696 if (ap_suspend_flag)
1698 queue_work(system_long_wq, &ap_scan_work);
1701 static void ap_reset_domain(void)
1705 if (ap_domain_index == -1 || !ap_test_config_domain(ap_domain_index))
1707 for (i = 0; i < AP_DEVICES; i++)
1708 ap_reset_queue(AP_MKQID(i, ap_domain_index));
1711 static void ap_reset_all(void)
1715 for (i = 0; i < AP_DOMAINS; i++) {
1716 if (!ap_test_config_domain(i))
1718 for (j = 0; j < AP_DEVICES; j++) {
1719 if (!ap_test_config_card_id(j))
1721 ap_reset_queue(AP_MKQID(j, i));
1726 static struct reset_call ap_reset_call = {
1731 * ap_module_init(): The module initialization code.
1733 * Initializes the module.
1735 int __init ap_module_init(void)
1740 if (ap_instructions_available() != 0) {
1741 pr_warn("The hardware system does not support AP instructions\n");
1745 /* Get AP configuration data if available */
1746 ap_init_configuration();
1748 if (ap_configuration)
1749 max_domain_id = ap_max_domain_id ? : (AP_DOMAINS - 1);
1752 if (ap_domain_index < -1 || ap_domain_index > max_domain_id) {
1753 pr_warn("%d is not a valid cryptographic domain\n",
1757 /* In resume callback we need to know if the user had set the domain.
1758 * If so, we can not just reset it.
1760 if (ap_domain_index >= 0)
1761 user_set_domain = 1;
1763 if (ap_interrupts_available()) {
1764 rc = register_adapter_interrupt(&ap_airq);
1765 ap_airq_flag = (rc == 0);
1768 register_reset_call(&ap_reset_call);
1770 /* Create /sys/bus/ap. */
1771 rc = bus_register(&ap_bus_type);
1774 for (i = 0; ap_bus_attrs[i]; i++) {
1775 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
1780 /* Create /sys/devices/ap. */
1781 ap_root_device = root_device_register("ap");
1782 rc = PTR_RET(ap_root_device);
1786 /* Setup the AP bus rescan timer. */
1787 setup_timer(&ap_config_timer, ap_config_timeout, 0);
1790 * Setup the high resultion poll timer.
1791 * If we are running under z/VM adjust polling to z/VM polling rate.
1794 poll_timeout = 1500000;
1795 spin_lock_init(&ap_poll_timer_lock);
1796 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1797 ap_poll_timer.function = ap_poll_timeout;
1799 /* Start the low priority AP bus poll thread. */
1800 if (ap_thread_flag) {
1801 rc = ap_poll_thread_start();
1806 rc = register_pm_notifier(&ap_power_notifier);
1810 queue_work(system_long_wq, &ap_scan_work);
1815 ap_poll_thread_stop();
1817 hrtimer_cancel(&ap_poll_timer);
1818 root_device_unregister(ap_root_device);
1821 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
1822 bus_unregister(&ap_bus_type);
1824 unregister_reset_call(&ap_reset_call);
1825 if (ap_using_interrupts())
1826 unregister_adapter_interrupt(&ap_airq);
1827 kfree(ap_configuration);
1832 * ap_modules_exit(): The module termination code
1834 * Terminates the module.
1836 void ap_module_exit(void)
1841 ap_poll_thread_stop();
1842 del_timer_sync(&ap_config_timer);
1843 hrtimer_cancel(&ap_poll_timer);
1844 tasklet_kill(&ap_tasklet);
1845 bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister);
1846 for (i = 0; ap_bus_attrs[i]; i++)
1847 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
1848 unregister_pm_notifier(&ap_power_notifier);
1849 root_device_unregister(ap_root_device);
1850 bus_unregister(&ap_bus_type);
1851 kfree(ap_configuration);
1852 unregister_reset_call(&ap_reset_call);
1853 if (ap_using_interrupts())
1854 unregister_adapter_interrupt(&ap_airq);
1857 module_init(ap_module_init);
1858 module_exit(ap_module_exit);