1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright IBM Corp. 2006, 2012
4 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Ralph Wuerthner <rwuerthn@de.ibm.com>
7 * Felix Beck <felix.beck@de.ibm.com>
8 * Holger Dengler <hd@linux.vnet.ibm.com>
10 * Adjunct processor bus.
13 #define KMSG_COMPONENT "ap"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16 #include <linux/kernel_stat.h>
17 #include <linux/moduleparam.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
20 #include <linux/err.h>
21 #include <linux/interrupt.h>
22 #include <linux/workqueue.h>
23 #include <linux/slab.h>
24 #include <linux/notifier.h>
25 #include <linux/kthread.h>
26 #include <linux/mutex.h>
27 #include <linux/suspend.h>
29 #include <linux/atomic.h>
31 #include <linux/hrtimer.h>
32 #include <linux/ktime.h>
33 #include <asm/facility.h>
34 #include <linux/crypto.h>
35 #include <linux/mod_devicetable.h>
36 #include <linux/debugfs.h>
37 #include <linux/ctype.h>
43 * Module parameters; note though this file itself isn't modular.
45 int ap_domain_index = -1; /* Adjunct Processor Domain Index */
46 static DEFINE_SPINLOCK(ap_domain_lock);
47 module_param_named(domain, ap_domain_index, int, 0440);
48 MODULE_PARM_DESC(domain, "domain index for ap devices");
49 EXPORT_SYMBOL(ap_domain_index);
51 static int ap_thread_flag;
52 module_param_named(poll_thread, ap_thread_flag, int, 0440);
53 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
56 module_param_named(apmask, apm_str, charp, 0440);
57 MODULE_PARM_DESC(apmask, "AP bus adapter mask.");
60 module_param_named(aqmask, aqm_str, charp, 0440);
61 MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
63 static struct device *ap_root_device;
65 DEFINE_SPINLOCK(ap_list_lock);
66 LIST_HEAD(ap_card_list);
68 /* Default permissions (ioctl, card and domain masking) */
69 struct ap_perms ap_perms;
70 EXPORT_SYMBOL(ap_perms);
71 DEFINE_MUTEX(ap_perms_mutex);
72 EXPORT_SYMBOL(ap_perms_mutex);
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;
97 static DEFINE_MUTEX(ap_poll_thread_mutex);
98 static DEFINE_SPINLOCK(ap_poll_timer_lock);
99 static struct hrtimer ap_poll_timer;
101 * In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
102 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.
104 static unsigned long long poll_timeout = 250000;
107 static int ap_suspend_flag;
108 /* Maximum domain id */
109 static int ap_max_domain_id;
111 * Flag to check if domain was set through module parameter domain=. This is
112 * important when supsend and resume is done in a z/VM environment where the
113 * domain might change.
115 static int user_set_domain;
116 static struct bus_type ap_bus_type;
118 /* Adapter interrupt definitions */
119 static void ap_interrupt_handler(struct airq_struct *airq, bool floating);
121 static int ap_airq_flag;
123 static struct airq_struct ap_airq = {
124 .handler = ap_interrupt_handler,
129 * ap_using_interrupts() - Returns non-zero if interrupt support is
132 static inline int ap_using_interrupts(void)
138 * ap_airq_ptr() - Get the address of the adapter interrupt indicator
140 * Returns the address of the local-summary-indicator of the adapter
141 * interrupt handler for AP, or NULL if adapter interrupts are not
144 void *ap_airq_ptr(void)
146 if (ap_using_interrupts())
147 return ap_airq.lsi_ptr;
152 * ap_interrupts_available(): Test if AP interrupts are available.
154 * Returns 1 if AP interrupts are available.
156 static int ap_interrupts_available(void)
158 return test_facility(65);
162 * ap_configuration_available(): Test if AP configuration
163 * information is available.
165 * Returns 1 if AP configuration information is available.
167 static int ap_configuration_available(void)
169 return test_facility(12);
173 * ap_apft_available(): Test if AP facilities test (APFT)
174 * facility is available.
176 * Returns 1 if APFT is is available.
178 static int ap_apft_available(void)
180 return test_facility(15);
184 * ap_qact_available(): Test if the PQAP(QACT) subfunction is available.
186 * Returns 1 if the QACT subfunction is available.
188 static inline int ap_qact_available(void)
190 if (ap_configuration)
191 return ap_configuration->qact;
196 * ap_query_configuration(): Fetch cryptographic config info
198 * Returns the ap configuration info fetched via PQAP(QCI).
199 * On success 0 is returned, on failure a negative errno
200 * is returned, e.g. if the PQAP(QCI) instruction is not
201 * available, the return value will be -EOPNOTSUPP.
203 static inline int ap_query_configuration(struct ap_config_info *info)
205 if (!ap_configuration_available())
213 * ap_init_configuration(): Allocate and query configuration array.
215 static void ap_init_configuration(void)
217 if (!ap_configuration_available())
220 ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL);
221 if (!ap_configuration)
223 if (ap_query_configuration(ap_configuration) != 0) {
224 kfree(ap_configuration);
225 ap_configuration = NULL;
231 * ap_test_config(): helper function to extract the nrth bit
232 * within the unsigned int array field.
234 static inline int ap_test_config(unsigned int *field, unsigned int nr)
236 return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
240 * ap_test_config_card_id(): Test, whether an AP card ID is configured.
243 * Returns 0 if the card is not configured
244 * 1 if the card is configured or
245 * if the configuration information is not available
247 static inline int ap_test_config_card_id(unsigned int id)
249 if (!ap_configuration) /* QCI not supported */
250 /* only ids 0...3F may be probed */
251 return id < 0x40 ? 1 : 0;
252 return ap_test_config(ap_configuration->apm, id);
256 * ap_test_config_usage_domain(): Test, whether an AP usage domain
258 * @domain AP usage domain ID
260 * Returns 0 if the usage domain is not configured
261 * 1 if the usage domain is configured or
262 * if the configuration information is not available
264 int ap_test_config_usage_domain(unsigned int domain)
266 if (!ap_configuration) /* QCI not supported */
268 return ap_test_config(ap_configuration->aqm, domain);
270 EXPORT_SYMBOL(ap_test_config_usage_domain);
273 * ap_test_config_ctrl_domain(): Test, whether an AP control domain
275 * @domain AP control domain ID
277 * Returns 1 if the control domain is configured
278 * 0 in all other cases
280 int ap_test_config_ctrl_domain(unsigned int domain)
282 if (!ap_configuration) /* QCI not supported */
284 return ap_test_config(ap_configuration->adm, domain);
286 EXPORT_SYMBOL(ap_test_config_ctrl_domain);
289 * ap_query_queue(): Check if an AP queue is available.
290 * @qid: The AP queue number
291 * @queue_depth: Pointer to queue depth value
292 * @device_type: Pointer to device type value
293 * @facilities: Pointer to facility indicator
295 static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type,
296 unsigned int *facilities)
298 struct ap_queue_status status;
302 if (!ap_test_config_card_id(AP_QID_CARD(qid)))
305 status = ap_test_queue(qid, ap_apft_available(), &info);
306 switch (status.response_code) {
307 case AP_RESPONSE_NORMAL:
308 *queue_depth = (int)(info & 0xff);
309 *device_type = (int)((info >> 24) & 0xff);
310 *facilities = (unsigned int)(info >> 32);
311 /* Update maximum domain id */
312 nd = (info >> 16) & 0xff;
313 /* if N bit is available, z13 and newer */
314 if ((info & (1UL << 57)) && nd > 0)
315 ap_max_domain_id = nd;
316 else /* older machine types */
317 ap_max_domain_id = 15;
318 switch (*device_type) {
319 /* For CEX2 and CEX3 the available functions
320 * are not reflected by the facilities bits.
321 * Instead it is coded into the type. So here
322 * modify the function bits based on the type.
324 case AP_DEVICE_TYPE_CEX2A:
325 case AP_DEVICE_TYPE_CEX3A:
326 *facilities |= 0x08000000;
328 case AP_DEVICE_TYPE_CEX2C:
329 case AP_DEVICE_TYPE_CEX3C:
330 *facilities |= 0x10000000;
336 case AP_RESPONSE_Q_NOT_AVAIL:
337 case AP_RESPONSE_DECONFIGURED:
338 case AP_RESPONSE_CHECKSTOPPED:
339 case AP_RESPONSE_INVALID_ADDRESS:
341 case AP_RESPONSE_RESET_IN_PROGRESS:
342 case AP_RESPONSE_OTHERWISE_CHANGED:
343 case AP_RESPONSE_BUSY:
350 void ap_wait(enum ap_wait wait)
356 case AP_WAIT_INTERRUPT:
357 if (ap_using_interrupts())
359 if (ap_poll_kthread) {
360 wake_up(&ap_poll_wait);
364 case AP_WAIT_TIMEOUT:
365 spin_lock_bh(&ap_poll_timer_lock);
366 if (!hrtimer_is_queued(&ap_poll_timer)) {
367 hr_time = poll_timeout;
368 hrtimer_forward_now(&ap_poll_timer, hr_time);
369 hrtimer_restart(&ap_poll_timer);
371 spin_unlock_bh(&ap_poll_timer_lock);
380 * ap_request_timeout(): Handling of request timeouts
381 * @t: timer making this callback
383 * Handles request timeouts.
385 void ap_request_timeout(struct timer_list *t)
387 struct ap_queue *aq = from_timer(aq, t, timeout);
391 spin_lock_bh(&aq->lock);
392 ap_wait(ap_sm_event(aq, AP_EVENT_TIMEOUT));
393 spin_unlock_bh(&aq->lock);
397 * ap_poll_timeout(): AP receive polling for finished AP requests.
398 * @unused: Unused pointer.
400 * Schedules the AP tasklet using a high resolution timer.
402 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
404 if (!ap_suspend_flag)
405 tasklet_schedule(&ap_tasklet);
406 return HRTIMER_NORESTART;
410 * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
411 * @airq: pointer to adapter interrupt descriptor
413 static void ap_interrupt_handler(struct airq_struct *airq, bool floating)
415 inc_irq_stat(IRQIO_APB);
416 if (!ap_suspend_flag)
417 tasklet_schedule(&ap_tasklet);
421 * ap_tasklet_fn(): Tasklet to poll all AP devices.
422 * @dummy: Unused variable
424 * Poll all AP devices on the bus.
426 static void ap_tasklet_fn(unsigned long dummy)
430 enum ap_wait wait = AP_WAIT_NONE;
432 /* Reset the indicator if interrupts are used. Thus new interrupts can
433 * be received. Doing it in the beginning of the tasklet is therefor
434 * important that no requests on any AP get lost.
436 if (ap_using_interrupts())
437 xchg(ap_airq.lsi_ptr, 0);
439 spin_lock_bh(&ap_list_lock);
440 for_each_ap_card(ac) {
441 for_each_ap_queue(aq, ac) {
442 spin_lock_bh(&aq->lock);
443 wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL));
444 spin_unlock_bh(&aq->lock);
447 spin_unlock_bh(&ap_list_lock);
452 static int ap_pending_requests(void)
457 spin_lock_bh(&ap_list_lock);
458 for_each_ap_card(ac) {
459 for_each_ap_queue(aq, ac) {
460 if (aq->queue_count == 0)
462 spin_unlock_bh(&ap_list_lock);
466 spin_unlock_bh(&ap_list_lock);
471 * ap_poll_thread(): Thread that polls for finished requests.
472 * @data: Unused pointer
474 * AP bus poll thread. The purpose of this thread is to poll for
475 * finished requests in a loop if there is a "free" cpu - that is
476 * a cpu that doesn't have anything better to do. The polling stops
477 * as soon as there is another task or if all messages have been
480 static int ap_poll_thread(void *data)
482 DECLARE_WAITQUEUE(wait, current);
484 set_user_nice(current, MAX_NICE);
486 while (!kthread_should_stop()) {
487 add_wait_queue(&ap_poll_wait, &wait);
488 set_current_state(TASK_INTERRUPTIBLE);
489 if (ap_suspend_flag || !ap_pending_requests()) {
493 set_current_state(TASK_RUNNING);
494 remove_wait_queue(&ap_poll_wait, &wait);
495 if (need_resched()) {
506 static int ap_poll_thread_start(void)
510 if (ap_using_interrupts() || ap_poll_kthread)
512 mutex_lock(&ap_poll_thread_mutex);
513 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
514 rc = PTR_ERR_OR_ZERO(ap_poll_kthread);
516 ap_poll_kthread = NULL;
517 mutex_unlock(&ap_poll_thread_mutex);
521 static void ap_poll_thread_stop(void)
523 if (!ap_poll_kthread)
525 mutex_lock(&ap_poll_thread_mutex);
526 kthread_stop(ap_poll_kthread);
527 ap_poll_kthread = NULL;
528 mutex_unlock(&ap_poll_thread_mutex);
531 #define is_card_dev(x) ((x)->parent == ap_root_device)
532 #define is_queue_dev(x) ((x)->parent != ap_root_device)
536 * @dev: Pointer to device
537 * @drv: Pointer to device_driver
539 * AP bus driver registration/unregistration.
541 static int ap_bus_match(struct device *dev, struct device_driver *drv)
543 struct ap_driver *ap_drv = to_ap_drv(drv);
544 struct ap_device_id *id;
547 * Compare device type of the device with the list of
548 * supported types of the device_driver.
550 for (id = ap_drv->ids; id->match_flags; id++) {
551 if (is_card_dev(dev) &&
552 id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE &&
553 id->dev_type == to_ap_dev(dev)->device_type)
555 if (is_queue_dev(dev) &&
556 id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE &&
557 id->dev_type == to_ap_dev(dev)->device_type)
564 * ap_uevent(): Uevent function for AP devices.
565 * @dev: Pointer to device
566 * @env: Pointer to kobj_uevent_env
568 * It sets up a single environment variable DEV_TYPE which contains the
569 * hardware device type.
571 static int ap_uevent(struct device *dev, struct kobj_uevent_env *env)
573 struct ap_device *ap_dev = to_ap_dev(dev);
579 /* Set up DEV_TYPE environment variable. */
580 retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
585 retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
590 static int ap_dev_suspend(struct device *dev)
592 struct ap_device *ap_dev = to_ap_dev(dev);
594 if (ap_dev->drv && ap_dev->drv->suspend)
595 ap_dev->drv->suspend(ap_dev);
599 static int ap_dev_resume(struct device *dev)
601 struct ap_device *ap_dev = to_ap_dev(dev);
603 if (ap_dev->drv && ap_dev->drv->resume)
604 ap_dev->drv->resume(ap_dev);
608 static void ap_bus_suspend(void)
610 AP_DBF(DBF_DEBUG, "%s running\n", __func__);
614 * Disable scanning for devices, thus we do not want to scan
615 * for them after removing.
617 flush_work(&ap_scan_work);
618 tasklet_disable(&ap_tasklet);
621 static int __ap_card_devices_unregister(struct device *dev, void *dummy)
623 if (is_card_dev(dev))
624 device_unregister(dev);
628 static int __ap_queue_devices_unregister(struct device *dev, void *dummy)
630 if (is_queue_dev(dev))
631 device_unregister(dev);
635 static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data)
637 if (is_queue_dev(dev) &&
638 AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data)
639 device_unregister(dev);
643 static void ap_bus_resume(void)
647 AP_DBF(DBF_DEBUG, "%s running\n", __func__);
649 /* remove all queue devices */
650 bus_for_each_dev(&ap_bus_type, NULL, NULL,
651 __ap_queue_devices_unregister);
652 /* remove all card devices */
653 bus_for_each_dev(&ap_bus_type, NULL, NULL,
654 __ap_card_devices_unregister);
656 /* Reset thin interrupt setting */
657 if (ap_interrupts_available() && !ap_using_interrupts()) {
658 rc = register_adapter_interrupt(&ap_airq);
659 ap_airq_flag = (rc == 0);
661 if (!ap_interrupts_available() && ap_using_interrupts()) {
662 unregister_adapter_interrupt(&ap_airq);
666 if (!user_set_domain)
667 ap_domain_index = -1;
668 /* Get things going again */
671 xchg(ap_airq.lsi_ptr, 0);
672 tasklet_enable(&ap_tasklet);
673 queue_work(system_long_wq, &ap_scan_work);
676 static int ap_power_event(struct notifier_block *this, unsigned long event,
680 case PM_HIBERNATION_PREPARE:
681 case PM_SUSPEND_PREPARE:
684 case PM_POST_HIBERNATION:
685 case PM_POST_SUSPEND:
693 static struct notifier_block ap_power_notifier = {
694 .notifier_call = ap_power_event,
697 static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, ap_dev_resume);
699 static struct bus_type ap_bus_type = {
701 .match = &ap_bus_match,
702 .uevent = &ap_uevent,
703 .pm = &ap_bus_pm_ops,
706 static int __ap_revise_reserved(struct device *dev, void *dummy)
708 int rc, card, queue, devres, drvres;
710 if (is_queue_dev(dev)) {
711 card = AP_QID_CARD(to_ap_queue(dev)->qid);
712 queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
713 mutex_lock(&ap_perms_mutex);
714 devres = test_bit_inv(card, ap_perms.apm)
715 && test_bit_inv(queue, ap_perms.aqm);
716 mutex_unlock(&ap_perms_mutex);
717 drvres = to_ap_drv(dev->driver)->flags
718 & AP_DRIVER_FLAG_DEFAULT;
719 if (!!devres != !!drvres) {
720 AP_DBF(DBF_DEBUG, "reprobing queue=%02x.%04x\n",
722 rc = device_reprobe(dev);
729 static void ap_bus_revise_bindings(void)
731 bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
734 int ap_owned_by_def_drv(int card, int queue)
738 if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
741 mutex_lock(&ap_perms_mutex);
743 if (test_bit_inv(card, ap_perms.apm)
744 && test_bit_inv(queue, ap_perms.aqm))
747 mutex_unlock(&ap_perms_mutex);
751 EXPORT_SYMBOL(ap_owned_by_def_drv);
753 int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
756 int card, queue, rc = 0;
758 mutex_lock(&ap_perms_mutex);
760 for (card = 0; !rc && card < AP_DEVICES; card++)
761 if (test_bit_inv(card, apm) &&
762 test_bit_inv(card, ap_perms.apm))
763 for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
764 if (test_bit_inv(queue, aqm) &&
765 test_bit_inv(queue, ap_perms.aqm))
768 mutex_unlock(&ap_perms_mutex);
772 EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
774 static int ap_device_probe(struct device *dev)
776 struct ap_device *ap_dev = to_ap_dev(dev);
777 struct ap_driver *ap_drv = to_ap_drv(dev->driver);
778 int card, queue, devres, drvres, rc;
780 if (is_queue_dev(dev)) {
782 * If the apqn is marked as reserved/used by ap bus and
783 * default drivers, only probe with drivers with the default
784 * flag set. If it is not marked, only probe with drivers
785 * with the default flag not set.
787 card = AP_QID_CARD(to_ap_queue(dev)->qid);
788 queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
789 mutex_lock(&ap_perms_mutex);
790 devres = test_bit_inv(card, ap_perms.apm)
791 && test_bit_inv(queue, ap_perms.aqm);
792 mutex_unlock(&ap_perms_mutex);
793 drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
794 if (!!devres != !!drvres)
798 /* Add queue/card to list of active queues/cards */
799 spin_lock_bh(&ap_list_lock);
800 if (is_card_dev(dev))
801 list_add(&to_ap_card(dev)->list, &ap_card_list);
803 list_add(&to_ap_queue(dev)->list,
804 &to_ap_queue(dev)->card->queues);
805 spin_unlock_bh(&ap_list_lock);
807 ap_dev->drv = ap_drv;
808 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
811 spin_lock_bh(&ap_list_lock);
812 if (is_card_dev(dev))
813 list_del_init(&to_ap_card(dev)->list);
815 list_del_init(&to_ap_queue(dev)->list);
816 spin_unlock_bh(&ap_list_lock);
823 static int ap_device_remove(struct device *dev)
825 struct ap_device *ap_dev = to_ap_dev(dev);
826 struct ap_driver *ap_drv = ap_dev->drv;
828 /* prepare ap queue device removal */
829 if (is_queue_dev(dev))
830 ap_queue_prepare_remove(to_ap_queue(dev));
832 /* driver's chance to clean up gracefully */
834 ap_drv->remove(ap_dev);
836 /* now do the ap queue device remove */
837 if (is_queue_dev(dev))
838 ap_queue_remove(to_ap_queue(dev));
840 /* Remove queue/card from list of active queues/cards */
841 spin_lock_bh(&ap_list_lock);
842 if (is_card_dev(dev))
843 list_del_init(&to_ap_card(dev)->list);
845 list_del_init(&to_ap_queue(dev)->list);
846 spin_unlock_bh(&ap_list_lock);
851 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
854 struct device_driver *drv = &ap_drv->driver;
859 drv->bus = &ap_bus_type;
860 drv->probe = ap_device_probe;
861 drv->remove = ap_device_remove;
864 return driver_register(drv);
866 EXPORT_SYMBOL(ap_driver_register);
868 void ap_driver_unregister(struct ap_driver *ap_drv)
870 driver_unregister(&ap_drv->driver);
872 EXPORT_SYMBOL(ap_driver_unregister);
874 void ap_bus_force_rescan(void)
878 /* processing a asynchronous bus rescan */
879 del_timer(&ap_config_timer);
880 queue_work(system_long_wq, &ap_scan_work);
881 flush_work(&ap_scan_work);
883 EXPORT_SYMBOL(ap_bus_force_rescan);
886 * A config change has happened, force an ap bus rescan.
888 void ap_bus_cfg_chg(void)
890 AP_DBF(DBF_INFO, "%s config change, forcing bus rescan\n", __func__);
892 ap_bus_force_rescan();
896 * hex2bitmap() - parse hex mask string and set bitmap.
897 * Valid strings are "0x012345678" with at least one valid hex number.
898 * Rest of the bitmap to the right is padded with 0. No spaces allowed
899 * within the string, the leading 0x may be omitted.
900 * Returns the bitmask with exactly the bits set as given by the hex
901 * string (both in big endian order).
903 static int hex2bitmap(const char *str, unsigned long *bitmap, int bits)
907 /* bits needs to be a multiple of 8 */
911 if (str[0] == '0' && str[1] == 'x')
916 for (i = 0; isxdigit(*str) && i < bits; str++) {
917 b = hex_to_bin(*str);
918 for (n = 0; n < 4; n++)
920 set_bit_inv(i + n, bitmap);
932 * modify_bitmap() - parse bitmask argument and modify an existing
933 * bit mask accordingly. A concatenation (done with ',') of these
934 * terms is recognized:
935 * +<bitnr>[-<bitnr>] or -<bitnr>[-<bitnr>]
936 * <bitnr> may be any valid number (hex, decimal or octal) in the range
937 * 0...bits-1; the leading + or - is required. Here are some examples:
938 * +0-15,+32,-128,-0xFF
939 * -0-255,+1-16,+0x128
940 * +1,+2,+3,+4,-5,-7-10
941 * Returns the new bitmap after all changes have been applied. Every
942 * positive value in the string will set a bit and every negative value
943 * in the string will clear a bit. As a bit may be touched more than once,
944 * the last 'operation' wins:
945 * +0-255,-128 = first bits 0-255 will be set, then bit 128 will be
946 * cleared again. All other bits are unmodified.
948 static int modify_bitmap(const char *str, unsigned long *bitmap, int bits)
953 /* bits needs to be a multiple of 8 */
959 if (sign != '+' && sign != '-')
961 a = z = simple_strtoul(str, &np, 0);
962 if (str == np || a >= bits)
966 z = simple_strtoul(++str, &np, 0);
967 if (str == np || a > z || z >= bits)
971 for (i = a; i <= z; i++)
973 set_bit_inv(i, bitmap);
975 clear_bit_inv(i, bitmap);
976 while (*str == ',' || *str == '\n')
983 int ap_parse_mask_str(const char *str,
984 unsigned long *bitmap, int bits,
987 unsigned long *newmap, size;
990 /* bits needs to be a multiple of 8 */
994 size = BITS_TO_LONGS(bits)*sizeof(unsigned long);
995 newmap = kmalloc(size, GFP_KERNEL);
998 if (mutex_lock_interruptible(lock)) {
1000 return -ERESTARTSYS;
1003 if (*str == '+' || *str == '-') {
1004 memcpy(newmap, bitmap, size);
1005 rc = modify_bitmap(str, newmap, bits);
1007 memset(newmap, 0, size);
1008 rc = hex2bitmap(str, newmap, bits);
1011 memcpy(bitmap, newmap, size);
1016 EXPORT_SYMBOL(ap_parse_mask_str);
1019 * AP bus attributes.
1022 static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
1024 return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
1027 static ssize_t ap_domain_store(struct bus_type *bus,
1028 const char *buf, size_t count)
1032 if (sscanf(buf, "%i\n", &domain) != 1 ||
1033 domain < 0 || domain > ap_max_domain_id ||
1034 !test_bit_inv(domain, ap_perms.aqm))
1036 spin_lock_bh(&ap_domain_lock);
1037 ap_domain_index = domain;
1038 spin_unlock_bh(&ap_domain_lock);
1040 AP_DBF(DBF_DEBUG, "stored new default domain=%d\n", domain);
1045 static BUS_ATTR_RW(ap_domain);
1047 static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
1049 if (!ap_configuration) /* QCI not supported */
1050 return snprintf(buf, PAGE_SIZE, "not supported\n");
1052 return snprintf(buf, PAGE_SIZE,
1053 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1054 ap_configuration->adm[0], ap_configuration->adm[1],
1055 ap_configuration->adm[2], ap_configuration->adm[3],
1056 ap_configuration->adm[4], ap_configuration->adm[5],
1057 ap_configuration->adm[6], ap_configuration->adm[7]);
1060 static BUS_ATTR_RO(ap_control_domain_mask);
1062 static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
1064 if (!ap_configuration) /* QCI not supported */
1065 return snprintf(buf, PAGE_SIZE, "not supported\n");
1067 return snprintf(buf, PAGE_SIZE,
1068 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1069 ap_configuration->aqm[0], ap_configuration->aqm[1],
1070 ap_configuration->aqm[2], ap_configuration->aqm[3],
1071 ap_configuration->aqm[4], ap_configuration->aqm[5],
1072 ap_configuration->aqm[6], ap_configuration->aqm[7]);
1075 static BUS_ATTR_RO(ap_usage_domain_mask);
1077 static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
1079 if (!ap_configuration) /* QCI not supported */
1080 return snprintf(buf, PAGE_SIZE, "not supported\n");
1082 return snprintf(buf, PAGE_SIZE,
1083 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1084 ap_configuration->apm[0], ap_configuration->apm[1],
1085 ap_configuration->apm[2], ap_configuration->apm[3],
1086 ap_configuration->apm[4], ap_configuration->apm[5],
1087 ap_configuration->apm[6], ap_configuration->apm[7]);
1090 static BUS_ATTR_RO(ap_adapter_mask);
1092 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
1094 return snprintf(buf, PAGE_SIZE, "%d\n",
1095 ap_using_interrupts() ? 1 : 0);
1098 static BUS_ATTR_RO(ap_interrupts);
1100 static ssize_t config_time_show(struct bus_type *bus, char *buf)
1102 return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
1105 static ssize_t config_time_store(struct bus_type *bus,
1106 const char *buf, size_t count)
1110 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
1112 ap_config_time = time;
1113 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1117 static BUS_ATTR_RW(config_time);
1119 static ssize_t poll_thread_show(struct bus_type *bus, char *buf)
1121 return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
1124 static ssize_t poll_thread_store(struct bus_type *bus,
1125 const char *buf, size_t count)
1129 if (sscanf(buf, "%d\n", &flag) != 1)
1132 rc = ap_poll_thread_start();
1136 ap_poll_thread_stop();
1140 static BUS_ATTR_RW(poll_thread);
1142 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
1144 return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
1147 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
1150 unsigned long long time;
1153 /* 120 seconds = maximum poll interval */
1154 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
1155 time > 120000000000ULL)
1157 poll_timeout = time;
1158 hr_time = poll_timeout;
1160 spin_lock_bh(&ap_poll_timer_lock);
1161 hrtimer_cancel(&ap_poll_timer);
1162 hrtimer_set_expires(&ap_poll_timer, hr_time);
1163 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
1164 spin_unlock_bh(&ap_poll_timer_lock);
1169 static BUS_ATTR_RW(poll_timeout);
1171 static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
1175 if (ap_configuration)
1176 max_domain_id = ap_max_domain_id ? : -1;
1179 return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id);
1182 static BUS_ATTR_RO(ap_max_domain_id);
1184 static ssize_t apmask_show(struct bus_type *bus, char *buf)
1188 if (mutex_lock_interruptible(&ap_perms_mutex))
1189 return -ERESTARTSYS;
1190 rc = snprintf(buf, PAGE_SIZE,
1191 "0x%016lx%016lx%016lx%016lx\n",
1192 ap_perms.apm[0], ap_perms.apm[1],
1193 ap_perms.apm[2], ap_perms.apm[3]);
1194 mutex_unlock(&ap_perms_mutex);
1199 static ssize_t apmask_store(struct bus_type *bus, const char *buf,
1204 rc = ap_parse_mask_str(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex);
1208 ap_bus_revise_bindings();
1213 static BUS_ATTR_RW(apmask);
1215 static ssize_t aqmask_show(struct bus_type *bus, char *buf)
1219 if (mutex_lock_interruptible(&ap_perms_mutex))
1220 return -ERESTARTSYS;
1221 rc = snprintf(buf, PAGE_SIZE,
1222 "0x%016lx%016lx%016lx%016lx\n",
1223 ap_perms.aqm[0], ap_perms.aqm[1],
1224 ap_perms.aqm[2], ap_perms.aqm[3]);
1225 mutex_unlock(&ap_perms_mutex);
1230 static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
1235 rc = ap_parse_mask_str(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex);
1239 ap_bus_revise_bindings();
1244 static BUS_ATTR_RW(aqmask);
1246 static struct bus_attribute *const ap_bus_attrs[] = {
1247 &bus_attr_ap_domain,
1248 &bus_attr_ap_control_domain_mask,
1249 &bus_attr_ap_usage_domain_mask,
1250 &bus_attr_ap_adapter_mask,
1251 &bus_attr_config_time,
1252 &bus_attr_poll_thread,
1253 &bus_attr_ap_interrupts,
1254 &bus_attr_poll_timeout,
1255 &bus_attr_ap_max_domain_id,
1262 * ap_select_domain(): Select an AP domain if possible and we haven't
1263 * already done so before.
1265 static void ap_select_domain(void)
1267 int count, max_count, best_domain;
1268 struct ap_queue_status status;
1272 * We want to use a single domain. Either the one specified with
1273 * the "domain=" parameter or the domain with the maximum number
1276 spin_lock_bh(&ap_domain_lock);
1277 if (ap_domain_index >= 0) {
1278 /* Domain has already been selected. */
1279 spin_unlock_bh(&ap_domain_lock);
1284 for (i = 0; i < AP_DOMAINS; i++) {
1285 if (!ap_test_config_usage_domain(i) ||
1286 !test_bit_inv(i, ap_perms.aqm))
1289 for (j = 0; j < AP_DEVICES; j++) {
1290 if (!ap_test_config_card_id(j))
1292 status = ap_test_queue(AP_MKQID(j, i),
1293 ap_apft_available(),
1295 if (status.response_code != AP_RESPONSE_NORMAL)
1299 if (count > max_count) {
1304 if (best_domain >= 0) {
1305 ap_domain_index = best_domain;
1306 AP_DBF(DBF_DEBUG, "new ap_domain_index=%d\n", ap_domain_index);
1308 spin_unlock_bh(&ap_domain_lock);
1312 * This function checks the type and returns either 0 for not
1313 * supported or the highest compatible type value (which may
1314 * include the input type value).
1316 static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func)
1320 /* < CEX2A is not supported */
1321 if (rawtype < AP_DEVICE_TYPE_CEX2A)
1323 /* up to CEX7 known and fully supported */
1324 if (rawtype <= AP_DEVICE_TYPE_CEX7)
1327 * unknown new type > CEX7, check for compatibility
1328 * to the highest known and supported type which is
1329 * currently CEX7 with the help of the QACT function.
1331 if (ap_qact_available()) {
1332 struct ap_queue_status status;
1333 union ap_qact_ap_info apinfo = {0};
1335 apinfo.mode = (func >> 26) & 0x07;
1336 apinfo.cat = AP_DEVICE_TYPE_CEX7;
1337 status = ap_qact(qid, 0, &apinfo);
1338 if (status.response_code == AP_RESPONSE_NORMAL
1339 && apinfo.cat >= AP_DEVICE_TYPE_CEX2A
1340 && apinfo.cat <= AP_DEVICE_TYPE_CEX7)
1341 comp_type = apinfo.cat;
1344 AP_DBF(DBF_WARN, "queue=%02x.%04x unable to map type %d\n",
1345 AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
1346 else if (comp_type != rawtype)
1347 AP_DBF(DBF_INFO, "queue=%02x.%04x map type %d to %d\n",
1348 AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype, comp_type);
1353 * Helper function to be used with bus_find_dev
1354 * matches for the card device with the given id
1356 static int __match_card_device_with_id(struct device *dev, const void *data)
1358 return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long)(void *) data;
1362 * Helper function to be used with bus_find_dev
1363 * matches for the queue device with a given qid
1365 static int __match_queue_device_with_qid(struct device *dev, const void *data)
1367 return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
1371 * Helper function to be used with bus_find_dev
1372 * matches any queue device with given queue id
1374 static int __match_queue_device_with_queue_id(struct device *dev, const void *data)
1376 return is_queue_dev(dev)
1377 && AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long) data;
1381 * Helper function for ap_scan_bus().
1382 * Does the scan bus job for the given adapter id.
1384 static void _ap_scan_bus_adapter(int id)
1390 struct ap_queue *aq;
1391 int rc, dom, depth, type, comp_type, borked;
1393 /* check if there is a card device registered with this id */
1394 dev = bus_find_device(&ap_bus_type, NULL,
1396 __match_card_device_with_id);
1397 ac = dev ? to_ap_card(dev) : NULL;
1398 if (!ap_test_config_card_id(id)) {
1400 /* Card device has been removed from configuration */
1401 bus_for_each_dev(&ap_bus_type, NULL,
1403 __ap_queue_devices_with_id_unregister);
1404 device_unregister(dev);
1411 * This card id is enabled in the configuration. If we already have
1412 * a card device with this id, check if type and functions are still
1413 * the very same. Also verify that at least one queue is available.
1416 /* find the first valid queue */
1417 for (dom = 0; dom < AP_DOMAINS; dom++) {
1418 qid = AP_MKQID(id, dom);
1419 if (ap_query_queue(qid, &depth, &type, &func) == 0)
1423 if (dom >= AP_DOMAINS) {
1424 /* no accessible queue on this card */
1426 } else if (ac->raw_hwtype != type) {
1427 /* card type has changed */
1428 AP_DBF(DBF_INFO, "card=%02x type changed.\n", id);
1430 } else if (ac->functions != func) {
1431 /* card functions have changed */
1432 AP_DBF(DBF_INFO, "card=%02x functions changed.\n", id);
1436 /* unregister card device and associated queues */
1437 bus_for_each_dev(&ap_bus_type, NULL,
1439 __ap_queue_devices_with_id_unregister);
1440 device_unregister(dev);
1442 /* go back if there is no valid queue on this card */
1443 if (dom >= AP_DOMAINS)
1450 * Go through all possible queue ids. Check and maybe create or release
1451 * queue devices for this card. If there exists no card device yet,
1452 * create a card device also.
1454 for (dom = 0; dom < AP_DOMAINS; dom++) {
1455 qid = AP_MKQID(id, dom);
1456 dev = bus_find_device(&ap_bus_type, NULL,
1458 __match_queue_device_with_qid);
1459 aq = dev ? to_ap_queue(dev) : NULL;
1460 if (!ap_test_config_usage_domain(dom)) {
1462 /* Queue device exists but has been
1463 * removed from configuration.
1465 device_unregister(dev);
1470 /* try to fetch infos about this queue */
1471 rc = ap_query_queue(qid, &depth, &type, &func);
1476 spin_lock_bh(&aq->lock);
1477 borked = aq->state == AP_STATE_BORKED;
1478 spin_unlock_bh(&aq->lock);
1481 /* Remove broken device */
1483 "removing broken queue=%02x.%04x\n",
1485 device_unregister(dev);
1492 /* a new queue device is needed, check out comp type */
1493 comp_type = ap_get_compatible_type(qid, type, func);
1496 /* maybe a card device needs to be created first */
1498 ac = ap_card_create(id, depth, type, comp_type, func);
1501 ac->ap_dev.device.bus = &ap_bus_type;
1502 ac->ap_dev.device.parent = ap_root_device;
1503 dev_set_name(&ac->ap_dev.device, "card%02x", id);
1504 /* Register card device with AP bus */
1505 rc = device_register(&ac->ap_dev.device);
1507 put_device(&ac->ap_dev.device);
1511 /* get it and thus adjust reference counter */
1512 get_device(&ac->ap_dev.device);
1514 /* now create the new queue device */
1515 aq = ap_queue_create(qid, comp_type);
1519 aq->ap_dev.device.bus = &ap_bus_type;
1520 aq->ap_dev.device.parent = &ac->ap_dev.device;
1521 dev_set_name(&aq->ap_dev.device, "%02x.%04x", id, dom);
1522 /* Register queue device */
1523 rc = device_register(&aq->ap_dev.device);
1525 put_device(&aq->ap_dev.device);
1528 } /* end domain loop */
1531 put_device(&ac->ap_dev.device);
1535 * ap_scan_bus(): Scan the AP bus for new devices
1536 * Runs periodically, workqueue timer (ap_config_time)
1538 static void ap_scan_bus(struct work_struct *unused)
1542 AP_DBF(DBF_DEBUG, "%s running\n", __func__);
1544 ap_query_configuration(ap_configuration);
1547 /* loop over all possible adapters */
1548 for (id = 0; id < AP_DEVICES; id++)
1549 _ap_scan_bus_adapter(id);
1551 /* check if there is at least one queue available with default domain */
1552 if (ap_domain_index >= 0) {
1553 struct device *dev =
1554 bus_find_device(&ap_bus_type, NULL,
1555 (void *)(long) ap_domain_index,
1556 __match_queue_device_with_queue_id);
1561 "no queue device with default domain %d available\n",
1565 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1568 static void ap_config_timeout(struct timer_list *unused)
1570 if (ap_suspend_flag)
1572 queue_work(system_long_wq, &ap_scan_work);
1575 static int __init ap_debug_init(void)
1577 ap_dbf_info = debug_register("ap", 1, 1,
1578 DBF_MAX_SPRINTF_ARGS * sizeof(long));
1579 debug_register_view(ap_dbf_info, &debug_sprintf_view);
1580 debug_set_level(ap_dbf_info, DBF_ERR);
1585 static void __init ap_perms_init(void)
1587 /* all resources useable if no kernel parameter string given */
1588 memset(&ap_perms.ioctlm, 0xFF, sizeof(ap_perms.ioctlm));
1589 memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm));
1590 memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm));
1592 /* apm kernel parameter string */
1594 memset(&ap_perms.apm, 0, sizeof(ap_perms.apm));
1595 ap_parse_mask_str(apm_str, ap_perms.apm, AP_DEVICES,
1599 /* aqm kernel parameter string */
1601 memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm));
1602 ap_parse_mask_str(aqm_str, ap_perms.aqm, AP_DOMAINS,
1608 * ap_module_init(): The module initialization code.
1610 * Initializes the module.
1612 static int __init ap_module_init(void)
1617 rc = ap_debug_init();
1621 if (!ap_instructions_available()) {
1622 pr_warn("The hardware system does not support AP instructions\n");
1626 /* set up the AP permissions (ioctls, ap and aq masks) */
1629 /* Get AP configuration data if available */
1630 ap_init_configuration();
1632 if (ap_configuration)
1634 ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1;
1637 if (ap_domain_index < -1 || ap_domain_index > max_domain_id ||
1638 (ap_domain_index >= 0 &&
1639 !test_bit_inv(ap_domain_index, ap_perms.aqm))) {
1640 pr_warn("%d is not a valid cryptographic domain\n",
1642 ap_domain_index = -1;
1644 /* In resume callback we need to know if the user had set the domain.
1645 * If so, we can not just reset it.
1647 if (ap_domain_index >= 0)
1648 user_set_domain = 1;
1650 if (ap_interrupts_available()) {
1651 rc = register_adapter_interrupt(&ap_airq);
1652 ap_airq_flag = (rc == 0);
1655 /* Create /sys/bus/ap. */
1656 rc = bus_register(&ap_bus_type);
1659 for (i = 0; ap_bus_attrs[i]; i++) {
1660 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
1665 /* Create /sys/devices/ap. */
1666 ap_root_device = root_device_register("ap");
1667 rc = PTR_ERR_OR_ZERO(ap_root_device);
1671 /* Setup the AP bus rescan timer. */
1672 timer_setup(&ap_config_timer, ap_config_timeout, 0);
1675 * Setup the high resultion poll timer.
1676 * If we are running under z/VM adjust polling to z/VM polling rate.
1679 poll_timeout = 1500000;
1680 spin_lock_init(&ap_poll_timer_lock);
1681 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1682 ap_poll_timer.function = ap_poll_timeout;
1684 /* Start the low priority AP bus poll thread. */
1685 if (ap_thread_flag) {
1686 rc = ap_poll_thread_start();
1691 rc = register_pm_notifier(&ap_power_notifier);
1695 queue_work(system_long_wq, &ap_scan_work);
1701 ap_poll_thread_stop();
1703 hrtimer_cancel(&ap_poll_timer);
1704 root_device_unregister(ap_root_device);
1707 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
1708 bus_unregister(&ap_bus_type);
1710 if (ap_using_interrupts())
1711 unregister_adapter_interrupt(&ap_airq);
1712 kfree(ap_configuration);
1715 device_initcall(ap_module_init);