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/moduleparam.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>
49 #include <linux/mod_devicetable.h>
50 #include <linux/debugfs.h>
57 * Module parameters; note though this file itself isn't modular.
59 int ap_domain_index
= -1; /* Adjunct Processor Domain Index */
60 static DEFINE_SPINLOCK(ap_domain_lock
);
61 module_param_named(domain
, ap_domain_index
, int, S_IRUSR
|S_IRGRP
);
62 MODULE_PARM_DESC(domain
, "domain index for ap devices");
63 EXPORT_SYMBOL(ap_domain_index
);
65 static int ap_thread_flag
= 0;
66 module_param_named(poll_thread
, ap_thread_flag
, int, S_IRUSR
|S_IRGRP
);
67 MODULE_PARM_DESC(poll_thread
, "Turn on/off poll thread, default is 0 (off).");
69 static struct device
*ap_root_device
;
71 DEFINE_SPINLOCK(ap_list_lock
);
72 LIST_HEAD(ap_card_list
);
74 static struct ap_config_info
*ap_configuration
;
75 static bool initialised
;
78 * AP bus related debug feature things.
80 debug_info_t
*ap_dbf_info
;
83 * Workqueue timer for bus rescan.
85 static struct timer_list ap_config_timer
;
86 static int ap_config_time
= AP_CONFIG_TIME
;
87 static void ap_scan_bus(struct work_struct
*);
88 static DECLARE_WORK(ap_scan_work
, ap_scan_bus
);
91 * Tasklet & timer for AP request polling and interrupts
93 static void ap_tasklet_fn(unsigned long);
94 static DECLARE_TASKLET(ap_tasklet
, ap_tasklet_fn
, 0);
95 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait
);
96 static struct task_struct
*ap_poll_kthread
= NULL
;
97 static DEFINE_MUTEX(ap_poll_thread_mutex
);
98 static DEFINE_SPINLOCK(ap_poll_timer_lock
);
99 static struct hrtimer ap_poll_timer
;
100 /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
101 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/
102 static unsigned long long poll_timeout
= 250000;
105 static int ap_suspend_flag
;
106 /* Maximum domain id */
107 static int ap_max_domain_id
;
108 /* Flag to check if domain was set through module parameter domain=. This is
109 * important when supsend and resume is done in a z/VM environment where the
110 * domain might change. */
111 static int user_set_domain
= 0;
112 static struct bus_type ap_bus_type
;
114 /* Adapter interrupt definitions */
115 static void ap_interrupt_handler(struct airq_struct
*airq
);
117 static int ap_airq_flag
;
119 static struct airq_struct ap_airq
= {
120 .handler
= ap_interrupt_handler
,
125 * ap_using_interrupts() - Returns non-zero if interrupt support is
128 static inline int ap_using_interrupts(void)
134 * ap_airq_ptr() - Get the address of the adapter interrupt indicator
136 * Returns the address of the local-summary-indicator of the adapter
137 * interrupt handler for AP, or NULL if adapter interrupts are not
140 void *ap_airq_ptr(void)
142 if (ap_using_interrupts())
143 return ap_airq
.lsi_ptr
;
148 * ap_interrupts_available(): Test if AP interrupts are available.
150 * Returns 1 if AP interrupts are available.
152 static int ap_interrupts_available(void)
154 return test_facility(65);
158 * ap_configuration_available(): Test if AP configuration
159 * information is available.
161 * Returns 1 if AP configuration information is available.
163 static int ap_configuration_available(void)
165 return test_facility(12);
169 * ap_test_queue(): Test adjunct processor queue.
170 * @qid: The AP queue number
171 * @info: Pointer to queue descriptor
173 * Returns AP queue status structure.
175 static inline struct ap_queue_status
176 ap_test_queue(ap_qid_t qid
, unsigned long *info
)
178 if (test_facility(15))
179 qid
|= 1UL << 23; /* set APFT T bit*/
180 return ap_tapq(qid
, info
);
183 static inline int ap_query_configuration(void)
185 if (!ap_configuration
)
187 return ap_qci(ap_configuration
);
191 * ap_init_configuration(): Allocate and query configuration array.
193 static void ap_init_configuration(void)
195 if (!ap_configuration_available())
198 ap_configuration
= kzalloc(sizeof(*ap_configuration
), GFP_KERNEL
);
199 if (!ap_configuration
)
201 if (ap_query_configuration() != 0) {
202 kfree(ap_configuration
);
203 ap_configuration
= NULL
;
209 * ap_test_config(): helper function to extract the nrth bit
210 * within the unsigned int array field.
212 static inline int ap_test_config(unsigned int *field
, unsigned int nr
)
214 return ap_test_bit((field
+ (nr
>> 5)), (nr
& 0x1f));
218 * ap_test_config_card_id(): Test, whether an AP card ID is configured.
221 * Returns 0 if the card is not configured
222 * 1 if the card is configured or
223 * if the configuration information is not available
225 static inline int ap_test_config_card_id(unsigned int id
)
227 if (!ap_configuration
) /* QCI not supported */
229 return ap_test_config(ap_configuration
->apm
, id
);
233 * ap_test_config_domain(): Test, whether an AP usage domain is configured.
234 * @domain AP usage domain ID
236 * Returns 0 if the usage domain is not configured
237 * 1 if the usage domain is configured or
238 * if the configuration information is not available
240 static inline int ap_test_config_domain(unsigned int domain
)
242 if (!ap_configuration
) /* QCI not supported */
244 return ap_test_config(ap_configuration
->aqm
, domain
);
248 * ap_query_queue(): Check if an AP queue is available.
249 * @qid: The AP queue number
250 * @queue_depth: Pointer to queue depth value
251 * @device_type: Pointer to device type value
252 * @facilities: Pointer to facility indicator
254 static int ap_query_queue(ap_qid_t qid
, int *queue_depth
, int *device_type
,
255 unsigned int *facilities
)
257 struct ap_queue_status status
;
261 if (!ap_test_config_card_id(AP_QID_CARD(qid
)))
264 status
= ap_test_queue(qid
, &info
);
265 switch (status
.response_code
) {
266 case AP_RESPONSE_NORMAL
:
267 *queue_depth
= (int)(info
& 0xff);
268 *device_type
= (int)((info
>> 24) & 0xff);
269 *facilities
= (unsigned int)(info
>> 32);
270 /* Update maximum domain id */
271 nd
= (info
>> 16) & 0xff;
272 /* if N bit is available, z13 and newer */
273 if ((info
& (1UL << 57)) && nd
> 0)
274 ap_max_domain_id
= nd
;
275 else /* older machine types */
276 ap_max_domain_id
= 15;
277 switch (*device_type
) {
278 /* For CEX2 and CEX3 the available functions
279 * are not refrected by the facilities bits.
280 * Instead it is coded into the type. So here
281 * modify the function bits based on the type.
283 case AP_DEVICE_TYPE_CEX2A
:
284 case AP_DEVICE_TYPE_CEX3A
:
285 *facilities
|= 0x08000000;
287 case AP_DEVICE_TYPE_CEX2C
:
288 case AP_DEVICE_TYPE_CEX3C
:
289 *facilities
|= 0x10000000;
295 case AP_RESPONSE_Q_NOT_AVAIL
:
296 case AP_RESPONSE_DECONFIGURED
:
297 case AP_RESPONSE_CHECKSTOPPED
:
298 case AP_RESPONSE_INVALID_ADDRESS
:
300 case AP_RESPONSE_RESET_IN_PROGRESS
:
301 case AP_RESPONSE_OTHERWISE_CHANGED
:
302 case AP_RESPONSE_BUSY
:
309 void ap_wait(enum ap_wait wait
)
315 case AP_WAIT_INTERRUPT
:
316 if (ap_using_interrupts())
318 if (ap_poll_kthread
) {
319 wake_up(&ap_poll_wait
);
323 case AP_WAIT_TIMEOUT
:
324 spin_lock_bh(&ap_poll_timer_lock
);
325 if (!hrtimer_is_queued(&ap_poll_timer
)) {
326 hr_time
= poll_timeout
;
327 hrtimer_forward_now(&ap_poll_timer
, hr_time
);
328 hrtimer_restart(&ap_poll_timer
);
330 spin_unlock_bh(&ap_poll_timer_lock
);
339 * ap_request_timeout(): Handling of request timeouts
340 * @data: Holds the AP device.
342 * Handles request timeouts.
344 void ap_request_timeout(unsigned long data
)
346 struct ap_queue
*aq
= (struct ap_queue
*) data
;
350 spin_lock_bh(&aq
->lock
);
351 ap_wait(ap_sm_event(aq
, AP_EVENT_TIMEOUT
));
352 spin_unlock_bh(&aq
->lock
);
356 * ap_poll_timeout(): AP receive polling for finished AP requests.
357 * @unused: Unused pointer.
359 * Schedules the AP tasklet using a high resolution timer.
361 static enum hrtimer_restart
ap_poll_timeout(struct hrtimer
*unused
)
363 if (!ap_suspend_flag
)
364 tasklet_schedule(&ap_tasklet
);
365 return HRTIMER_NORESTART
;
369 * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
370 * @airq: pointer to adapter interrupt descriptor
372 static void ap_interrupt_handler(struct airq_struct
*airq
)
374 inc_irq_stat(IRQIO_APB
);
375 if (!ap_suspend_flag
)
376 tasklet_schedule(&ap_tasklet
);
380 * ap_tasklet_fn(): Tasklet to poll all AP devices.
381 * @dummy: Unused variable
383 * Poll all AP devices on the bus.
385 static void ap_tasklet_fn(unsigned long dummy
)
389 enum ap_wait wait
= AP_WAIT_NONE
;
391 /* Reset the indicator if interrupts are used. Thus new interrupts can
392 * be received. Doing it in the beginning of the tasklet is therefor
393 * important that no requests on any AP get lost.
395 if (ap_using_interrupts())
396 xchg(ap_airq
.lsi_ptr
, 0);
398 spin_lock_bh(&ap_list_lock
);
399 for_each_ap_card(ac
) {
400 for_each_ap_queue(aq
, ac
) {
401 spin_lock_bh(&aq
->lock
);
402 wait
= min(wait
, ap_sm_event_loop(aq
, AP_EVENT_POLL
));
403 spin_unlock_bh(&aq
->lock
);
406 spin_unlock_bh(&ap_list_lock
);
411 static int ap_pending_requests(void)
416 spin_lock_bh(&ap_list_lock
);
417 for_each_ap_card(ac
) {
418 for_each_ap_queue(aq
, ac
) {
419 if (aq
->queue_count
== 0)
421 spin_unlock_bh(&ap_list_lock
);
425 spin_unlock_bh(&ap_list_lock
);
430 * ap_poll_thread(): Thread that polls for finished requests.
431 * @data: Unused pointer
433 * AP bus poll thread. The purpose of this thread is to poll for
434 * finished requests in a loop if there is a "free" cpu - that is
435 * a cpu that doesn't have anything better to do. The polling stops
436 * as soon as there is another task or if all messages have been
439 static int ap_poll_thread(void *data
)
441 DECLARE_WAITQUEUE(wait
, current
);
443 set_user_nice(current
, MAX_NICE
);
445 while (!kthread_should_stop()) {
446 add_wait_queue(&ap_poll_wait
, &wait
);
447 set_current_state(TASK_INTERRUPTIBLE
);
448 if (ap_suspend_flag
|| !ap_pending_requests()) {
452 set_current_state(TASK_RUNNING
);
453 remove_wait_queue(&ap_poll_wait
, &wait
);
454 if (need_resched()) {
465 static int ap_poll_thread_start(void)
469 if (ap_using_interrupts() || ap_poll_kthread
)
471 mutex_lock(&ap_poll_thread_mutex
);
472 ap_poll_kthread
= kthread_run(ap_poll_thread
, NULL
, "appoll");
473 rc
= PTR_RET(ap_poll_kthread
);
475 ap_poll_kthread
= NULL
;
476 mutex_unlock(&ap_poll_thread_mutex
);
480 static void ap_poll_thread_stop(void)
482 if (!ap_poll_kthread
)
484 mutex_lock(&ap_poll_thread_mutex
);
485 kthread_stop(ap_poll_kthread
);
486 ap_poll_kthread
= NULL
;
487 mutex_unlock(&ap_poll_thread_mutex
);
490 #define is_card_dev(x) ((x)->parent == ap_root_device)
491 #define is_queue_dev(x) ((x)->parent != ap_root_device)
495 * @dev: Pointer to device
496 * @drv: Pointer to device_driver
498 * AP bus driver registration/unregistration.
500 static int ap_bus_match(struct device
*dev
, struct device_driver
*drv
)
502 struct ap_driver
*ap_drv
= to_ap_drv(drv
);
503 struct ap_device_id
*id
;
506 * Compare device type of the device with the list of
507 * supported types of the device_driver.
509 for (id
= ap_drv
->ids
; id
->match_flags
; id
++) {
510 if (is_card_dev(dev
) &&
511 id
->match_flags
& AP_DEVICE_ID_MATCH_CARD_TYPE
&&
512 id
->dev_type
== to_ap_dev(dev
)->device_type
)
514 if (is_queue_dev(dev
) &&
515 id
->match_flags
& AP_DEVICE_ID_MATCH_QUEUE_TYPE
&&
516 id
->dev_type
== to_ap_dev(dev
)->device_type
)
523 * ap_uevent(): Uevent function for AP devices.
524 * @dev: Pointer to device
525 * @env: Pointer to kobj_uevent_env
527 * It sets up a single environment variable DEV_TYPE which contains the
528 * hardware device type.
530 static int ap_uevent (struct device
*dev
, struct kobj_uevent_env
*env
)
532 struct ap_device
*ap_dev
= to_ap_dev(dev
);
538 /* Set up DEV_TYPE environment variable. */
539 retval
= add_uevent_var(env
, "DEV_TYPE=%04X", ap_dev
->device_type
);
544 retval
= add_uevent_var(env
, "MODALIAS=ap:t%02X", ap_dev
->device_type
);
549 static int ap_dev_suspend(struct device
*dev
)
551 struct ap_device
*ap_dev
= to_ap_dev(dev
);
553 if (ap_dev
->drv
&& ap_dev
->drv
->suspend
)
554 ap_dev
->drv
->suspend(ap_dev
);
558 static int ap_dev_resume(struct device
*dev
)
560 struct ap_device
*ap_dev
= to_ap_dev(dev
);
562 if (ap_dev
->drv
&& ap_dev
->drv
->resume
)
563 ap_dev
->drv
->resume(ap_dev
);
567 static void ap_bus_suspend(void)
569 AP_DBF(DBF_DEBUG
, "ap_bus_suspend running\n");
573 * Disable scanning for devices, thus we do not want to scan
574 * for them after removing.
576 flush_work(&ap_scan_work
);
577 tasklet_disable(&ap_tasklet
);
580 static int __ap_card_devices_unregister(struct device
*dev
, void *dummy
)
582 if (is_card_dev(dev
))
583 device_unregister(dev
);
587 static int __ap_queue_devices_unregister(struct device
*dev
, void *dummy
)
589 if (is_queue_dev(dev
))
590 device_unregister(dev
);
594 static int __ap_queue_devices_with_id_unregister(struct device
*dev
, void *data
)
596 if (is_queue_dev(dev
) &&
597 AP_QID_CARD(to_ap_queue(dev
)->qid
) == (int)(long) data
)
598 device_unregister(dev
);
602 static void ap_bus_resume(void)
606 AP_DBF(DBF_DEBUG
, "ap_bus_resume running\n");
608 /* remove all queue devices */
609 bus_for_each_dev(&ap_bus_type
, NULL
, NULL
,
610 __ap_queue_devices_unregister
);
611 /* remove all card devices */
612 bus_for_each_dev(&ap_bus_type
, NULL
, NULL
,
613 __ap_card_devices_unregister
);
615 /* Reset thin interrupt setting */
616 if (ap_interrupts_available() && !ap_using_interrupts()) {
617 rc
= register_adapter_interrupt(&ap_airq
);
618 ap_airq_flag
= (rc
== 0);
620 if (!ap_interrupts_available() && ap_using_interrupts()) {
621 unregister_adapter_interrupt(&ap_airq
);
625 if (!user_set_domain
)
626 ap_domain_index
= -1;
627 /* Get things going again */
630 xchg(ap_airq
.lsi_ptr
, 0);
631 tasklet_enable(&ap_tasklet
);
632 queue_work(system_long_wq
, &ap_scan_work
);
635 static int ap_power_event(struct notifier_block
*this, unsigned long event
,
639 case PM_HIBERNATION_PREPARE
:
640 case PM_SUSPEND_PREPARE
:
643 case PM_POST_HIBERNATION
:
644 case PM_POST_SUSPEND
:
652 static struct notifier_block ap_power_notifier
= {
653 .notifier_call
= ap_power_event
,
656 static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops
, ap_dev_suspend
, ap_dev_resume
);
658 static struct bus_type ap_bus_type
= {
660 .match
= &ap_bus_match
,
661 .uevent
= &ap_uevent
,
662 .pm
= &ap_bus_pm_ops
,
665 static int ap_device_probe(struct device
*dev
)
667 struct ap_device
*ap_dev
= to_ap_dev(dev
);
668 struct ap_driver
*ap_drv
= to_ap_drv(dev
->driver
);
671 /* Add queue/card to list of active queues/cards */
672 spin_lock_bh(&ap_list_lock
);
673 if (is_card_dev(dev
))
674 list_add(&to_ap_card(dev
)->list
, &ap_card_list
);
676 list_add(&to_ap_queue(dev
)->list
,
677 &to_ap_queue(dev
)->card
->queues
);
678 spin_unlock_bh(&ap_list_lock
);
680 ap_dev
->drv
= ap_drv
;
681 rc
= ap_drv
->probe
? ap_drv
->probe(ap_dev
) : -ENODEV
;
684 spin_lock_bh(&ap_list_lock
);
685 if (is_card_dev(dev
))
686 list_del_init(&to_ap_card(dev
)->list
);
688 list_del_init(&to_ap_queue(dev
)->list
);
689 spin_unlock_bh(&ap_list_lock
);
696 static int ap_device_remove(struct device
*dev
)
698 struct ap_device
*ap_dev
= to_ap_dev(dev
);
699 struct ap_driver
*ap_drv
= ap_dev
->drv
;
702 ap_drv
->remove(ap_dev
);
704 /* Remove queue/card from list of active queues/cards */
705 spin_lock_bh(&ap_list_lock
);
706 if (is_card_dev(dev
))
707 list_del_init(&to_ap_card(dev
)->list
);
709 list_del_init(&to_ap_queue(dev
)->list
);
710 spin_unlock_bh(&ap_list_lock
);
715 int ap_driver_register(struct ap_driver
*ap_drv
, struct module
*owner
,
718 struct device_driver
*drv
= &ap_drv
->driver
;
723 drv
->bus
= &ap_bus_type
;
724 drv
->probe
= ap_device_probe
;
725 drv
->remove
= ap_device_remove
;
728 return driver_register(drv
);
730 EXPORT_SYMBOL(ap_driver_register
);
732 void ap_driver_unregister(struct ap_driver
*ap_drv
)
734 driver_unregister(&ap_drv
->driver
);
736 EXPORT_SYMBOL(ap_driver_unregister
);
738 void ap_bus_force_rescan(void)
742 /* processing a asynchronous bus rescan */
743 del_timer(&ap_config_timer
);
744 queue_work(system_long_wq
, &ap_scan_work
);
745 flush_work(&ap_scan_work
);
747 EXPORT_SYMBOL(ap_bus_force_rescan
);
752 static ssize_t
ap_domain_show(struct bus_type
*bus
, char *buf
)
754 return snprintf(buf
, PAGE_SIZE
, "%d\n", ap_domain_index
);
757 static ssize_t
ap_domain_store(struct bus_type
*bus
,
758 const char *buf
, size_t count
)
762 if (sscanf(buf
, "%i\n", &domain
) != 1 ||
763 domain
< 0 || domain
> ap_max_domain_id
)
765 spin_lock_bh(&ap_domain_lock
);
766 ap_domain_index
= domain
;
767 spin_unlock_bh(&ap_domain_lock
);
769 AP_DBF(DBF_DEBUG
, "stored new default domain=%d\n", domain
);
774 static BUS_ATTR(ap_domain
, 0644, ap_domain_show
, ap_domain_store
);
776 static ssize_t
ap_control_domain_mask_show(struct bus_type
*bus
, char *buf
)
778 if (!ap_configuration
) /* QCI not supported */
779 return snprintf(buf
, PAGE_SIZE
, "not supported\n");
781 return snprintf(buf
, PAGE_SIZE
,
782 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
783 ap_configuration
->adm
[0], ap_configuration
->adm
[1],
784 ap_configuration
->adm
[2], ap_configuration
->adm
[3],
785 ap_configuration
->adm
[4], ap_configuration
->adm
[5],
786 ap_configuration
->adm
[6], ap_configuration
->adm
[7]);
789 static BUS_ATTR(ap_control_domain_mask
, 0444,
790 ap_control_domain_mask_show
, NULL
);
792 static ssize_t
ap_usage_domain_mask_show(struct bus_type
*bus
, char *buf
)
794 if (!ap_configuration
) /* QCI not supported */
795 return snprintf(buf
, PAGE_SIZE
, "not supported\n");
797 return snprintf(buf
, PAGE_SIZE
,
798 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
799 ap_configuration
->aqm
[0], ap_configuration
->aqm
[1],
800 ap_configuration
->aqm
[2], ap_configuration
->aqm
[3],
801 ap_configuration
->aqm
[4], ap_configuration
->aqm
[5],
802 ap_configuration
->aqm
[6], ap_configuration
->aqm
[7]);
805 static BUS_ATTR(ap_usage_domain_mask
, 0444,
806 ap_usage_domain_mask_show
, NULL
);
808 static ssize_t
ap_config_time_show(struct bus_type
*bus
, char *buf
)
810 return snprintf(buf
, PAGE_SIZE
, "%d\n", ap_config_time
);
813 static ssize_t
ap_interrupts_show(struct bus_type
*bus
, char *buf
)
815 return snprintf(buf
, PAGE_SIZE
, "%d\n",
816 ap_using_interrupts() ? 1 : 0);
819 static BUS_ATTR(ap_interrupts
, 0444, ap_interrupts_show
, NULL
);
821 static ssize_t
ap_config_time_store(struct bus_type
*bus
,
822 const char *buf
, size_t count
)
826 if (sscanf(buf
, "%d\n", &time
) != 1 || time
< 5 || time
> 120)
828 ap_config_time
= time
;
829 mod_timer(&ap_config_timer
, jiffies
+ ap_config_time
* HZ
);
833 static BUS_ATTR(config_time
, 0644, ap_config_time_show
, ap_config_time_store
);
835 static ssize_t
ap_poll_thread_show(struct bus_type
*bus
, char *buf
)
837 return snprintf(buf
, PAGE_SIZE
, "%d\n", ap_poll_kthread
? 1 : 0);
840 static ssize_t
ap_poll_thread_store(struct bus_type
*bus
,
841 const char *buf
, size_t count
)
845 if (sscanf(buf
, "%d\n", &flag
) != 1)
848 rc
= ap_poll_thread_start();
852 ap_poll_thread_stop();
856 static BUS_ATTR(poll_thread
, 0644, ap_poll_thread_show
, ap_poll_thread_store
);
858 static ssize_t
poll_timeout_show(struct bus_type
*bus
, char *buf
)
860 return snprintf(buf
, PAGE_SIZE
, "%llu\n", poll_timeout
);
863 static ssize_t
poll_timeout_store(struct bus_type
*bus
, const char *buf
,
866 unsigned long long time
;
869 /* 120 seconds = maximum poll interval */
870 if (sscanf(buf
, "%llu\n", &time
) != 1 || time
< 1 ||
871 time
> 120000000000ULL)
874 hr_time
= poll_timeout
;
876 spin_lock_bh(&ap_poll_timer_lock
);
877 hrtimer_cancel(&ap_poll_timer
);
878 hrtimer_set_expires(&ap_poll_timer
, hr_time
);
879 hrtimer_start_expires(&ap_poll_timer
, HRTIMER_MODE_ABS
);
880 spin_unlock_bh(&ap_poll_timer_lock
);
885 static BUS_ATTR(poll_timeout
, 0644, poll_timeout_show
, poll_timeout_store
);
887 static ssize_t
ap_max_domain_id_show(struct bus_type
*bus
, char *buf
)
891 if (ap_configuration
)
892 max_domain_id
= ap_max_domain_id
? : -1;
895 return snprintf(buf
, PAGE_SIZE
, "%d\n", max_domain_id
);
898 static BUS_ATTR(ap_max_domain_id
, 0444, ap_max_domain_id_show
, NULL
);
900 static struct bus_attribute
*const ap_bus_attrs
[] = {
902 &bus_attr_ap_control_domain_mask
,
903 &bus_attr_ap_usage_domain_mask
,
904 &bus_attr_config_time
,
905 &bus_attr_poll_thread
,
906 &bus_attr_ap_interrupts
,
907 &bus_attr_poll_timeout
,
908 &bus_attr_ap_max_domain_id
,
913 * ap_select_domain(): Select an AP domain.
915 * Pick one of the 16 AP domains.
917 static int ap_select_domain(void)
919 int count
, max_count
, best_domain
;
920 struct ap_queue_status status
;
924 * We want to use a single domain. Either the one specified with
925 * the "domain=" parameter or the domain with the maximum number
928 spin_lock_bh(&ap_domain_lock
);
929 if (ap_domain_index
>= 0) {
930 /* Domain has already been selected. */
931 spin_unlock_bh(&ap_domain_lock
);
936 for (i
= 0; i
< AP_DOMAINS
; i
++) {
937 if (!ap_test_config_domain(i
))
940 for (j
= 0; j
< AP_DEVICES
; j
++) {
941 if (!ap_test_config_card_id(j
))
943 status
= ap_test_queue(AP_MKQID(j
, i
), NULL
);
944 if (status
.response_code
!= AP_RESPONSE_NORMAL
)
948 if (count
> max_count
) {
953 if (best_domain
>= 0){
954 ap_domain_index
= best_domain
;
955 AP_DBF(DBF_DEBUG
, "new ap_domain_index=%d\n", ap_domain_index
);
956 spin_unlock_bh(&ap_domain_lock
);
959 spin_unlock_bh(&ap_domain_lock
);
964 * helper function to be used with bus_find_dev
965 * matches for the card device with the given id
967 static int __match_card_device_with_id(struct device
*dev
, void *data
)
969 return is_card_dev(dev
) && to_ap_card(dev
)->id
== (int)(long) data
;
972 /* helper function to be used with bus_find_dev
973 * matches for the queue device with a given qid
975 static int __match_queue_device_with_qid(struct device
*dev
, void *data
)
977 return is_queue_dev(dev
) && to_ap_queue(dev
)->qid
== (int)(long) data
;
981 * ap_scan_bus(): Scan the AP bus for new devices
982 * Runs periodically, workqueue timer (ap_config_time)
984 static void ap_scan_bus(struct work_struct
*unused
)
990 int depth
= 0, type
= 0;
991 unsigned int functions
= 0;
992 int rc
, id
, dom
, borked
, domains
, defdomdevs
= 0;
994 AP_DBF(DBF_DEBUG
, "ap_scan_bus running\n");
996 ap_query_configuration();
997 if (ap_select_domain() != 0)
1000 for (id
= 0; id
< AP_DEVICES
; id
++) {
1001 /* check if device is registered */
1002 dev
= bus_find_device(&ap_bus_type
, NULL
,
1004 __match_card_device_with_id
);
1005 ac
= dev
? to_ap_card(dev
) : NULL
;
1006 if (!ap_test_config_card_id(id
)) {
1008 /* Card device has been removed from
1009 * configuration, remove the belonging
1012 bus_for_each_dev(&ap_bus_type
, NULL
,
1014 __ap_queue_devices_with_id_unregister
);
1015 /* now remove the card device */
1016 device_unregister(dev
);
1021 /* According to the configuration there should be a card
1022 * device, so check if there is at least one valid queue
1023 * and maybe create queue devices and the card device.
1026 for (dom
= 0; dom
< AP_DOMAINS
; dom
++) {
1027 qid
= AP_MKQID(id
, dom
);
1028 dev
= bus_find_device(&ap_bus_type
, NULL
,
1030 __match_queue_device_with_qid
);
1031 aq
= dev
? to_ap_queue(dev
) : NULL
;
1032 if (!ap_test_config_domain(dom
)) {
1034 /* Queue device exists but has been
1035 * removed from configuration.
1037 device_unregister(dev
);
1042 rc
= ap_query_queue(qid
, &depth
, &type
, &functions
);
1044 spin_lock_bh(&aq
->lock
);
1045 if (rc
== -ENODEV
||
1046 /* adapter reconfiguration */
1047 (ac
&& ac
->functions
!= functions
))
1048 aq
->state
= AP_STATE_BORKED
;
1049 borked
= aq
->state
== AP_STATE_BORKED
;
1050 spin_unlock_bh(&aq
->lock
);
1051 if (borked
) /* Remove broken device */
1052 device_unregister(dev
);
1056 if (dom
== ap_domain_index
)
1063 /* new queue device needed */
1065 /* but first create the card device */
1066 ac
= ap_card_create(id
, depth
,
1070 ac
->ap_dev
.device
.bus
= &ap_bus_type
;
1071 ac
->ap_dev
.device
.parent
= ap_root_device
;
1072 dev_set_name(&ac
->ap_dev
.device
,
1074 /* Register card with AP bus */
1075 rc
= device_register(&ac
->ap_dev
.device
);
1077 put_device(&ac
->ap_dev
.device
);
1081 /* get it and thus adjust reference counter */
1082 get_device(&ac
->ap_dev
.device
);
1084 /* now create the new queue device */
1085 aq
= ap_queue_create(qid
, type
);
1089 aq
->ap_dev
.device
.bus
= &ap_bus_type
;
1090 aq
->ap_dev
.device
.parent
= &ac
->ap_dev
.device
;
1091 dev_set_name(&aq
->ap_dev
.device
,
1092 "%02x.%04x", id
, dom
);
1093 /* Start with a device reset */
1094 spin_lock_bh(&aq
->lock
);
1095 ap_wait(ap_sm_event(aq
, AP_EVENT_POLL
));
1096 spin_unlock_bh(&aq
->lock
);
1097 /* Register device */
1098 rc
= device_register(&aq
->ap_dev
.device
);
1100 put_device(&aq
->ap_dev
.device
);
1104 if (dom
== ap_domain_index
)
1106 } /* end domain loop */
1108 /* remove card dev if there are no queue devices */
1110 device_unregister(&ac
->ap_dev
.device
);
1111 put_device(&ac
->ap_dev
.device
);
1113 } /* end device loop */
1116 AP_DBF(DBF_INFO
, "no queue device with default domain %d available\n",
1120 mod_timer(&ap_config_timer
, jiffies
+ ap_config_time
* HZ
);
1123 static void ap_config_timeout(unsigned long ptr
)
1125 if (ap_suspend_flag
)
1127 queue_work(system_long_wq
, &ap_scan_work
);
1130 static void ap_reset_all(void)
1134 for (i
= 0; i
< AP_DOMAINS
; i
++) {
1135 if (!ap_test_config_domain(i
))
1137 for (j
= 0; j
< AP_DEVICES
; j
++) {
1138 if (!ap_test_config_card_id(j
))
1140 ap_rapq(AP_MKQID(j
, i
));
1145 static struct reset_call ap_reset_call
= {
1149 int __init
ap_debug_init(void)
1151 ap_dbf_info
= debug_register("ap", 1, 1,
1152 DBF_MAX_SPRINTF_ARGS
* sizeof(long));
1153 debug_register_view(ap_dbf_info
, &debug_sprintf_view
);
1154 debug_set_level(ap_dbf_info
, DBF_ERR
);
1159 void ap_debug_exit(void)
1161 debug_unregister(ap_dbf_info
);
1165 * ap_module_init(): The module initialization code.
1167 * Initializes the module.
1169 int __init
ap_module_init(void)
1174 rc
= ap_debug_init();
1178 if (ap_instructions_available() != 0) {
1179 pr_warn("The hardware system does not support AP instructions\n");
1183 /* Get AP configuration data if available */
1184 ap_init_configuration();
1186 if (ap_configuration
)
1188 ap_max_domain_id
? ap_max_domain_id
: AP_DOMAINS
- 1;
1191 if (ap_domain_index
< -1 || ap_domain_index
> max_domain_id
) {
1192 pr_warn("%d is not a valid cryptographic domain\n",
1194 ap_domain_index
= -1;
1196 /* In resume callback we need to know if the user had set the domain.
1197 * If so, we can not just reset it.
1199 if (ap_domain_index
>= 0)
1200 user_set_domain
= 1;
1202 if (ap_interrupts_available()) {
1203 rc
= register_adapter_interrupt(&ap_airq
);
1204 ap_airq_flag
= (rc
== 0);
1207 register_reset_call(&ap_reset_call
);
1209 /* Create /sys/bus/ap. */
1210 rc
= bus_register(&ap_bus_type
);
1213 for (i
= 0; ap_bus_attrs
[i
]; i
++) {
1214 rc
= bus_create_file(&ap_bus_type
, ap_bus_attrs
[i
]);
1219 /* Create /sys/devices/ap. */
1220 ap_root_device
= root_device_register("ap");
1221 rc
= PTR_RET(ap_root_device
);
1225 /* Setup the AP bus rescan timer. */
1226 setup_timer(&ap_config_timer
, ap_config_timeout
, 0);
1229 * Setup the high resultion poll timer.
1230 * If we are running under z/VM adjust polling to z/VM polling rate.
1233 poll_timeout
= 1500000;
1234 spin_lock_init(&ap_poll_timer_lock
);
1235 hrtimer_init(&ap_poll_timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_ABS
);
1236 ap_poll_timer
.function
= ap_poll_timeout
;
1238 /* Start the low priority AP bus poll thread. */
1239 if (ap_thread_flag
) {
1240 rc
= ap_poll_thread_start();
1245 rc
= register_pm_notifier(&ap_power_notifier
);
1249 queue_work(system_long_wq
, &ap_scan_work
);
1255 ap_poll_thread_stop();
1257 hrtimer_cancel(&ap_poll_timer
);
1258 root_device_unregister(ap_root_device
);
1261 bus_remove_file(&ap_bus_type
, ap_bus_attrs
[i
]);
1262 bus_unregister(&ap_bus_type
);
1264 unregister_reset_call(&ap_reset_call
);
1265 if (ap_using_interrupts())
1266 unregister_adapter_interrupt(&ap_airq
);
1267 kfree(ap_configuration
);
1270 device_initcall(ap_module_init
);