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 ap_dev->drv = ap_drv;
672 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
678 static int ap_device_remove(struct device *dev)
680 struct ap_device *ap_dev = to_ap_dev(dev);
681 struct ap_driver *ap_drv = ap_dev->drv;
683 spin_lock_bh(&ap_list_lock);
684 if (is_card_dev(dev))
685 list_del_init(&to_ap_card(dev)->list);
687 list_del_init(&to_ap_queue(dev)->list);
688 spin_unlock_bh(&ap_list_lock);
690 ap_drv->remove(ap_dev);
694 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
697 struct device_driver *drv = &ap_drv->driver;
702 drv->bus = &ap_bus_type;
703 drv->probe = ap_device_probe;
704 drv->remove = ap_device_remove;
707 return driver_register(drv);
709 EXPORT_SYMBOL(ap_driver_register);
711 void ap_driver_unregister(struct ap_driver *ap_drv)
713 driver_unregister(&ap_drv->driver);
715 EXPORT_SYMBOL(ap_driver_unregister);
717 void ap_bus_force_rescan(void)
721 /* processing a asynchronous bus rescan */
722 del_timer(&ap_config_timer);
723 queue_work(system_long_wq, &ap_scan_work);
724 flush_work(&ap_scan_work);
726 EXPORT_SYMBOL(ap_bus_force_rescan);
731 static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
733 return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
736 static ssize_t ap_domain_store(struct bus_type *bus,
737 const char *buf, size_t count)
741 if (sscanf(buf, "%i\n", &domain) != 1 ||
742 domain < 0 || domain > ap_max_domain_id)
744 spin_lock_bh(&ap_domain_lock);
745 ap_domain_index = domain;
746 spin_unlock_bh(&ap_domain_lock);
748 AP_DBF(DBF_DEBUG, "store new default domain=%d\n", domain);
753 static BUS_ATTR(ap_domain, 0644, ap_domain_show, ap_domain_store);
755 static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
757 if (!ap_configuration) /* QCI not supported */
758 return snprintf(buf, PAGE_SIZE, "not supported\n");
760 return snprintf(buf, PAGE_SIZE,
761 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
762 ap_configuration->adm[0], ap_configuration->adm[1],
763 ap_configuration->adm[2], ap_configuration->adm[3],
764 ap_configuration->adm[4], ap_configuration->adm[5],
765 ap_configuration->adm[6], ap_configuration->adm[7]);
768 static BUS_ATTR(ap_control_domain_mask, 0444,
769 ap_control_domain_mask_show, NULL);
771 static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
773 if (!ap_configuration) /* QCI not supported */
774 return snprintf(buf, PAGE_SIZE, "not supported\n");
776 return snprintf(buf, PAGE_SIZE,
777 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
778 ap_configuration->aqm[0], ap_configuration->aqm[1],
779 ap_configuration->aqm[2], ap_configuration->aqm[3],
780 ap_configuration->aqm[4], ap_configuration->aqm[5],
781 ap_configuration->aqm[6], ap_configuration->aqm[7]);
784 static BUS_ATTR(ap_usage_domain_mask, 0444,
785 ap_usage_domain_mask_show, NULL);
787 static ssize_t ap_config_time_show(struct bus_type *bus, char *buf)
789 return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
792 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
794 return snprintf(buf, PAGE_SIZE, "%d\n",
795 ap_using_interrupts() ? 1 : 0);
798 static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL);
800 static ssize_t ap_config_time_store(struct bus_type *bus,
801 const char *buf, size_t count)
805 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
807 ap_config_time = time;
808 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
812 static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store);
814 static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf)
816 return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
819 static ssize_t ap_poll_thread_store(struct bus_type *bus,
820 const char *buf, size_t count)
824 if (sscanf(buf, "%d\n", &flag) != 1)
827 rc = ap_poll_thread_start();
831 ap_poll_thread_stop();
835 static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store);
837 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
839 return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
842 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
845 unsigned long long time;
848 /* 120 seconds = maximum poll interval */
849 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
850 time > 120000000000ULL)
853 hr_time = poll_timeout;
855 spin_lock_bh(&ap_poll_timer_lock);
856 hrtimer_cancel(&ap_poll_timer);
857 hrtimer_set_expires(&ap_poll_timer, hr_time);
858 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
859 spin_unlock_bh(&ap_poll_timer_lock);
864 static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
866 static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
870 if (ap_configuration)
871 max_domain_id = ap_max_domain_id ? : -1;
874 return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id);
877 static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL);
879 static struct bus_attribute *const ap_bus_attrs[] = {
881 &bus_attr_ap_control_domain_mask,
882 &bus_attr_ap_usage_domain_mask,
883 &bus_attr_config_time,
884 &bus_attr_poll_thread,
885 &bus_attr_ap_interrupts,
886 &bus_attr_poll_timeout,
887 &bus_attr_ap_max_domain_id,
892 * ap_select_domain(): Select an AP domain.
894 * Pick one of the 16 AP domains.
896 static int ap_select_domain(void)
898 int count, max_count, best_domain;
899 struct ap_queue_status status;
903 * We want to use a single domain. Either the one specified with
904 * the "domain=" parameter or the domain with the maximum number
907 spin_lock_bh(&ap_domain_lock);
908 if (ap_domain_index >= 0) {
909 /* Domain has already been selected. */
910 spin_unlock_bh(&ap_domain_lock);
915 for (i = 0; i < AP_DOMAINS; i++) {
916 if (!ap_test_config_domain(i))
919 for (j = 0; j < AP_DEVICES; j++) {
920 if (!ap_test_config_card_id(j))
922 status = ap_test_queue(AP_MKQID(j, i), NULL);
923 if (status.response_code != AP_RESPONSE_NORMAL)
927 if (count > max_count) {
932 if (best_domain >= 0){
933 ap_domain_index = best_domain;
934 spin_unlock_bh(&ap_domain_lock);
937 spin_unlock_bh(&ap_domain_lock);
942 * helper function to be used with bus_find_dev
943 * matches for the card device with the given id
945 static int __match_card_device_with_id(struct device *dev, void *data)
947 return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long) data;
950 /* helper function to be used with bus_find_dev
951 * matches for the queue device with a given qid
953 static int __match_queue_device_with_qid(struct device *dev, void *data)
955 return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
959 * ap_scan_bus(): Scan the AP bus for new devices
960 * Runs periodically, workqueue timer (ap_config_time)
962 static void ap_scan_bus(struct work_struct *unused)
968 int depth = 0, type = 0;
969 unsigned int functions = 0;
970 int rc, id, dom, borked, domains;
972 AP_DBF(DBF_DEBUG, "ap_scan_bus running\n");
974 ap_query_configuration();
975 if (ap_select_domain() != 0)
978 for (id = 0; id < AP_DEVICES; id++) {
979 /* check if device is registered */
980 dev = bus_find_device(&ap_bus_type, NULL,
982 __match_card_device_with_id);
983 ac = dev ? to_ap_card(dev) : NULL;
984 if (!ap_test_config_card_id(id)) {
986 /* Card device has been removed from
987 * configuration, remove the belonging
990 bus_for_each_dev(&ap_bus_type, NULL,
992 __ap_queue_devices_with_id_unregister);
993 /* now remove the card device */
994 device_unregister(dev);
999 /* According to the configuration there should be a card
1000 * device, so check if there is at least one valid queue
1001 * and maybe create queue devices and the card device.
1004 for (dom = 0; dom < AP_DOMAINS; dom++) {
1005 qid = AP_MKQID(id, dom);
1006 dev = bus_find_device(&ap_bus_type, NULL,
1008 __match_queue_device_with_qid);
1009 aq = dev ? to_ap_queue(dev) : NULL;
1010 if (!ap_test_config_domain(dom)) {
1012 /* Queue device exists but has been
1013 * removed from configuration.
1015 device_unregister(dev);
1020 rc = ap_query_queue(qid, &depth, &type, &functions);
1022 spin_lock_bh(&aq->lock);
1023 if (rc == -ENODEV ||
1024 /* adapter reconfiguration */
1025 (ac && ac->functions != functions))
1026 aq->state = AP_STATE_BORKED;
1027 borked = aq->state == AP_STATE_BORKED;
1028 spin_unlock_bh(&aq->lock);
1029 if (borked) /* Remove broken device */
1030 device_unregister(dev);
1039 /* new queue device needed */
1041 /* but first create the card device */
1042 ac = ap_card_create(id, depth,
1046 ac->ap_dev.device.bus = &ap_bus_type;
1047 ac->ap_dev.device.parent = ap_root_device;
1048 dev_set_name(&ac->ap_dev.device,
1050 /* Register card with AP bus */
1051 rc = device_register(&ac->ap_dev.device);
1053 put_device(&ac->ap_dev.device);
1057 /* get it and thus adjust reference counter */
1058 get_device(&ac->ap_dev.device);
1059 /* Add card device to card list */
1060 spin_lock_bh(&ap_list_lock);
1061 list_add(&ac->list, &ap_card_list);
1062 spin_unlock_bh(&ap_list_lock);
1064 /* now create the new queue device */
1065 aq = ap_queue_create(qid, type);
1069 aq->ap_dev.device.bus = &ap_bus_type;
1070 aq->ap_dev.device.parent = &ac->ap_dev.device;
1071 dev_set_name(&aq->ap_dev.device,
1072 "%02x.%04x", id, dom);
1073 /* Add queue device to card queue list */
1074 spin_lock_bh(&ap_list_lock);
1075 list_add(&aq->list, &ac->queues);
1076 spin_unlock_bh(&ap_list_lock);
1077 /* Start with a device reset */
1078 spin_lock_bh(&aq->lock);
1079 ap_wait(ap_sm_event(aq, AP_EVENT_POLL));
1080 spin_unlock_bh(&aq->lock);
1081 /* Register device */
1082 rc = device_register(&aq->ap_dev.device);
1084 spin_lock_bh(&ap_list_lock);
1085 list_del_init(&aq->list);
1086 spin_unlock_bh(&ap_list_lock);
1087 put_device(&aq->ap_dev.device);
1091 } /* end domain loop */
1093 /* remove card dev if there are no queue devices */
1095 device_unregister(&ac->ap_dev.device);
1096 put_device(&ac->ap_dev.device);
1098 } /* end device loop */
1100 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1103 static void ap_config_timeout(unsigned long ptr)
1105 if (ap_suspend_flag)
1107 queue_work(system_long_wq, &ap_scan_work);
1110 static void ap_reset_all(void)
1114 for (i = 0; i < AP_DOMAINS; i++) {
1115 if (!ap_test_config_domain(i))
1117 for (j = 0; j < AP_DEVICES; j++) {
1118 if (!ap_test_config_card_id(j))
1120 ap_rapq(AP_MKQID(j, i));
1125 static struct reset_call ap_reset_call = {
1129 int __init ap_debug_init(void)
1131 ap_dbf_info = debug_register("ap", 1, 1,
1132 DBF_MAX_SPRINTF_ARGS * sizeof(long));
1133 debug_register_view(ap_dbf_info, &debug_sprintf_view);
1134 debug_set_level(ap_dbf_info, DBF_ERR);
1139 void ap_debug_exit(void)
1141 debug_unregister(ap_dbf_info);
1145 * ap_module_init(): The module initialization code.
1147 * Initializes the module.
1149 int __init ap_module_init(void)
1154 rc = ap_debug_init();
1158 if (ap_instructions_available() != 0) {
1159 pr_warn("The hardware system does not support AP instructions\n");
1163 /* Get AP configuration data if available */
1164 ap_init_configuration();
1166 if (ap_configuration)
1167 max_domain_id = ap_max_domain_id ? : (AP_DOMAINS - 1);
1170 if (ap_domain_index < -1 || ap_domain_index > max_domain_id) {
1171 pr_warn("%d is not a valid cryptographic domain\n",
1176 /* In resume callback we need to know if the user had set the domain.
1177 * If so, we can not just reset it.
1179 if (ap_domain_index >= 0)
1180 user_set_domain = 1;
1182 if (ap_interrupts_available()) {
1183 rc = register_adapter_interrupt(&ap_airq);
1184 ap_airq_flag = (rc == 0);
1187 register_reset_call(&ap_reset_call);
1189 /* Create /sys/bus/ap. */
1190 rc = bus_register(&ap_bus_type);
1193 for (i = 0; ap_bus_attrs[i]; i++) {
1194 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
1199 /* Create /sys/devices/ap. */
1200 ap_root_device = root_device_register("ap");
1201 rc = PTR_RET(ap_root_device);
1205 /* Setup the AP bus rescan timer. */
1206 setup_timer(&ap_config_timer, ap_config_timeout, 0);
1209 * Setup the high resultion poll timer.
1210 * If we are running under z/VM adjust polling to z/VM polling rate.
1213 poll_timeout = 1500000;
1214 spin_lock_init(&ap_poll_timer_lock);
1215 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1216 ap_poll_timer.function = ap_poll_timeout;
1218 /* Start the low priority AP bus poll thread. */
1219 if (ap_thread_flag) {
1220 rc = ap_poll_thread_start();
1225 rc = register_pm_notifier(&ap_power_notifier);
1229 queue_work(system_long_wq, &ap_scan_work);
1235 ap_poll_thread_stop();
1237 hrtimer_cancel(&ap_poll_timer);
1238 root_device_unregister(ap_root_device);
1241 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
1242 bus_unregister(&ap_bus_type);
1244 unregister_reset_call(&ap_reset_call);
1245 if (ap_using_interrupts())
1246 unregister_adapter_interrupt(&ap_airq);
1248 kfree(ap_configuration);
1251 device_initcall(ap_module_init);