1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright IBM Corp. 2006, 2021
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>
9 * Harald Freudenberger <freude@linux.ibm.com>
11 * Adjunct processor bus.
14 #define KMSG_COMPONENT "ap"
15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17 #include <linux/kernel_stat.h>
18 #include <linux/moduleparam.h>
19 #include <linux/init.h>
20 #include <linux/delay.h>
21 #include <linux/err.h>
22 #include <linux/freezer.h>
23 #include <linux/interrupt.h>
24 #include <linux/workqueue.h>
25 #include <linux/slab.h>
26 #include <linux/notifier.h>
27 #include <linux/kthread.h>
28 #include <linux/mutex.h>
30 #include <linux/atomic.h>
32 #include <linux/hrtimer.h>
33 #include <linux/ktime.h>
34 #include <asm/facility.h>
35 #include <linux/crypto.h>
36 #include <linux/mod_devicetable.h>
37 #include <linux/debugfs.h>
38 #include <linux/ctype.h>
44 * Module parameters; note though this file itself isn't modular.
46 int ap_domain_index = -1; /* Adjunct Processor Domain Index */
47 static DEFINE_SPINLOCK(ap_domain_lock);
48 module_param_named(domain, ap_domain_index, int, 0440);
49 MODULE_PARM_DESC(domain, "domain index for ap devices");
50 EXPORT_SYMBOL(ap_domain_index);
52 static int ap_thread_flag;
53 module_param_named(poll_thread, ap_thread_flag, int, 0440);
54 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
57 module_param_named(apmask, apm_str, charp, 0440);
58 MODULE_PARM_DESC(apmask, "AP bus adapter mask.");
61 module_param_named(aqmask, aqm_str, charp, 0440);
62 MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
64 static struct device *ap_root_device;
66 /* Hashtable of all queue devices on the AP bus */
67 DEFINE_HASHTABLE(ap_queues, 8);
68 /* lock used for the ap_queues hashtable */
69 DEFINE_SPINLOCK(ap_queues_lock);
71 /* Default permissions (ioctl, card and domain masking) */
72 struct ap_perms ap_perms;
73 EXPORT_SYMBOL(ap_perms);
74 DEFINE_MUTEX(ap_perms_mutex);
75 EXPORT_SYMBOL(ap_perms_mutex);
77 /* # of bus scans since init */
78 static atomic64_t ap_scan_bus_count;
80 /* # of bindings complete since init */
81 static atomic64_t ap_bindings_complete_count = ATOMIC64_INIT(0);
83 /* completion for initial APQN bindings complete */
84 static DECLARE_COMPLETION(ap_init_apqn_bindings_complete);
86 static struct ap_config_info *ap_qci_info;
89 * AP bus related debug feature things.
91 debug_info_t *ap_dbf_info;
94 * Workqueue timer for bus rescan.
96 static struct timer_list ap_config_timer;
97 static int ap_config_time = AP_CONFIG_TIME;
98 static void ap_scan_bus(struct work_struct *);
99 static DECLARE_WORK(ap_scan_work, ap_scan_bus);
102 * Tasklet & timer for AP request polling and interrupts
104 static void ap_tasklet_fn(unsigned long);
105 static DECLARE_TASKLET_OLD(ap_tasklet, ap_tasklet_fn);
106 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
107 static struct task_struct *ap_poll_kthread;
108 static DEFINE_MUTEX(ap_poll_thread_mutex);
109 static DEFINE_SPINLOCK(ap_poll_timer_lock);
110 static struct hrtimer ap_poll_timer;
112 * In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
113 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.
115 static unsigned long long poll_timeout = 250000;
117 /* Maximum domain id, if not given via qci */
118 static int ap_max_domain_id = 15;
119 /* Maximum adapter id, if not given via qci */
120 static int ap_max_adapter_id = 63;
122 static struct bus_type ap_bus_type;
124 /* Adapter interrupt definitions */
125 static void ap_interrupt_handler(struct airq_struct *airq, bool floating);
127 static int ap_airq_flag;
129 static struct airq_struct ap_airq = {
130 .handler = ap_interrupt_handler,
135 * ap_using_interrupts() - Returns non-zero if interrupt support is
138 static inline int ap_using_interrupts(void)
144 * ap_airq_ptr() - Get the address of the adapter interrupt indicator
146 * Returns the address of the local-summary-indicator of the adapter
147 * interrupt handler for AP, or NULL if adapter interrupts are not
150 void *ap_airq_ptr(void)
152 if (ap_using_interrupts())
153 return ap_airq.lsi_ptr;
158 * ap_interrupts_available(): Test if AP interrupts are available.
160 * Returns 1 if AP interrupts are available.
162 static int ap_interrupts_available(void)
164 return test_facility(65);
168 * ap_qci_available(): Test if AP configuration
169 * information can be queried via QCI subfunction.
171 * Returns 1 if subfunction PQAP(QCI) is available.
173 static int ap_qci_available(void)
175 return test_facility(12);
179 * ap_apft_available(): Test if AP facilities test (APFT)
180 * facility is available.
182 * Returns 1 if APFT is is available.
184 static int ap_apft_available(void)
186 return test_facility(15);
190 * ap_qact_available(): Test if the PQAP(QACT) subfunction is available.
192 * Returns 1 if the QACT subfunction is available.
194 static inline int ap_qact_available(void)
197 return ap_qci_info->qact;
202 * ap_fetch_qci_info(): Fetch cryptographic config info
204 * Returns the ap configuration info fetched via PQAP(QCI).
205 * On success 0 is returned, on failure a negative errno
206 * is returned, e.g. if the PQAP(QCI) instruction is not
207 * available, the return value will be -EOPNOTSUPP.
209 static inline int ap_fetch_qci_info(struct ap_config_info *info)
211 if (!ap_qci_available())
219 * ap_init_qci_info(): Allocate and query qci config info.
220 * Does also update the static variables ap_max_domain_id
221 * and ap_max_adapter_id if this info is available.
224 static void __init ap_init_qci_info(void)
226 if (!ap_qci_available()) {
227 AP_DBF_INFO("%s QCI not supported\n", __func__);
231 ap_qci_info = kzalloc(sizeof(*ap_qci_info), GFP_KERNEL);
234 if (ap_fetch_qci_info(ap_qci_info) != 0) {
239 AP_DBF_INFO("%s successful fetched initial qci info\n", __func__);
241 if (ap_qci_info->apxa) {
242 if (ap_qci_info->Na) {
243 ap_max_adapter_id = ap_qci_info->Na;
244 AP_DBF_INFO("%s new ap_max_adapter_id is %d\n",
245 __func__, ap_max_adapter_id);
247 if (ap_qci_info->Nd) {
248 ap_max_domain_id = ap_qci_info->Nd;
249 AP_DBF_INFO("%s new ap_max_domain_id is %d\n",
250 __func__, ap_max_domain_id);
256 * ap_test_config(): helper function to extract the nrth bit
257 * within the unsigned int array field.
259 static inline int ap_test_config(unsigned int *field, unsigned int nr)
261 return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
265 * ap_test_config_card_id(): Test, whether an AP card ID is configured.
267 * Returns 0 if the card is not configured
268 * 1 if the card is configured or
269 * if the configuration information is not available
271 static inline int ap_test_config_card_id(unsigned int id)
273 if (id > ap_max_adapter_id)
276 return ap_test_config(ap_qci_info->apm, id);
281 * ap_test_config_usage_domain(): Test, whether an AP usage domain
284 * Returns 0 if the usage domain is not configured
285 * 1 if the usage domain is configured or
286 * if the configuration information is not available
288 int ap_test_config_usage_domain(unsigned int domain)
290 if (domain > ap_max_domain_id)
293 return ap_test_config(ap_qci_info->aqm, domain);
296 EXPORT_SYMBOL(ap_test_config_usage_domain);
299 * ap_test_config_ctrl_domain(): Test, whether an AP control domain
301 * @domain AP control domain ID
303 * Returns 1 if the control domain is configured
304 * 0 in all other cases
306 int ap_test_config_ctrl_domain(unsigned int domain)
308 if (!ap_qci_info || domain > ap_max_domain_id)
310 return ap_test_config(ap_qci_info->adm, domain);
312 EXPORT_SYMBOL(ap_test_config_ctrl_domain);
315 * ap_queue_info(): Check and get AP queue info.
316 * Returns true if TAPQ succeeded and the info is filled or
319 static bool ap_queue_info(ap_qid_t qid, int *q_type,
320 unsigned int *q_fac, int *q_depth, bool *q_decfg)
322 struct ap_queue_status status;
323 unsigned long info = 0;
325 /* make sure we don't run into a specifiation exception */
326 if (AP_QID_CARD(qid) > ap_max_adapter_id ||
327 AP_QID_QUEUE(qid) > ap_max_domain_id)
330 /* call TAPQ on this APQN */
331 status = ap_test_queue(qid, ap_apft_available(), &info);
332 switch (status.response_code) {
333 case AP_RESPONSE_NORMAL:
334 case AP_RESPONSE_RESET_IN_PROGRESS:
335 case AP_RESPONSE_DECONFIGURED:
336 case AP_RESPONSE_CHECKSTOPPED:
337 case AP_RESPONSE_BUSY:
339 * According to the architecture in all these cases the
340 * info should be filled. All bits 0 is not possible as
341 * there is at least one of the mode bits set.
343 if (WARN_ON_ONCE(!info))
345 *q_type = (int)((info >> 24) & 0xff);
346 *q_fac = (unsigned int)(info >> 32);
347 *q_depth = (int)(info & 0xff);
348 *q_decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
350 /* For CEX2 and CEX3 the available functions
351 * are not reflected by the facilities bits.
352 * Instead it is coded into the type. So here
353 * modify the function bits based on the type.
355 case AP_DEVICE_TYPE_CEX2A:
356 case AP_DEVICE_TYPE_CEX3A:
357 *q_fac |= 0x08000000;
359 case AP_DEVICE_TYPE_CEX2C:
360 case AP_DEVICE_TYPE_CEX3C:
361 *q_fac |= 0x10000000;
369 * A response code which indicates, there is no info available.
375 void ap_wait(enum ap_sm_wait wait)
380 case AP_SM_WAIT_AGAIN:
381 case AP_SM_WAIT_INTERRUPT:
382 if (ap_using_interrupts())
384 if (ap_poll_kthread) {
385 wake_up(&ap_poll_wait);
389 case AP_SM_WAIT_TIMEOUT:
390 spin_lock_bh(&ap_poll_timer_lock);
391 if (!hrtimer_is_queued(&ap_poll_timer)) {
392 hr_time = poll_timeout;
393 hrtimer_forward_now(&ap_poll_timer, hr_time);
394 hrtimer_restart(&ap_poll_timer);
396 spin_unlock_bh(&ap_poll_timer_lock);
398 case AP_SM_WAIT_NONE:
405 * ap_request_timeout(): Handling of request timeouts
406 * @t: timer making this callback
408 * Handles request timeouts.
410 void ap_request_timeout(struct timer_list *t)
412 struct ap_queue *aq = from_timer(aq, t, timeout);
414 spin_lock_bh(&aq->lock);
415 ap_wait(ap_sm_event(aq, AP_SM_EVENT_TIMEOUT));
416 spin_unlock_bh(&aq->lock);
420 * ap_poll_timeout(): AP receive polling for finished AP requests.
421 * @unused: Unused pointer.
423 * Schedules the AP tasklet using a high resolution timer.
425 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
427 tasklet_schedule(&ap_tasklet);
428 return HRTIMER_NORESTART;
432 * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
433 * @airq: pointer to adapter interrupt descriptor
435 static void ap_interrupt_handler(struct airq_struct *airq, bool floating)
437 inc_irq_stat(IRQIO_APB);
438 tasklet_schedule(&ap_tasklet);
442 * ap_tasklet_fn(): Tasklet to poll all AP devices.
443 * @dummy: Unused variable
445 * Poll all AP devices on the bus.
447 static void ap_tasklet_fn(unsigned long dummy)
451 enum ap_sm_wait wait = AP_SM_WAIT_NONE;
453 /* Reset the indicator if interrupts are used. Thus new interrupts can
454 * be received. Doing it in the beginning of the tasklet is therefor
455 * important that no requests on any AP get lost.
457 if (ap_using_interrupts())
458 xchg(ap_airq.lsi_ptr, 0);
460 spin_lock_bh(&ap_queues_lock);
461 hash_for_each(ap_queues, bkt, aq, hnode) {
462 spin_lock_bh(&aq->lock);
463 wait = min(wait, ap_sm_event_loop(aq, AP_SM_EVENT_POLL));
464 spin_unlock_bh(&aq->lock);
466 spin_unlock_bh(&ap_queues_lock);
471 static int ap_pending_requests(void)
476 spin_lock_bh(&ap_queues_lock);
477 hash_for_each(ap_queues, bkt, aq, hnode) {
478 if (aq->queue_count == 0)
480 spin_unlock_bh(&ap_queues_lock);
483 spin_unlock_bh(&ap_queues_lock);
488 * ap_poll_thread(): Thread that polls for finished requests.
489 * @data: Unused pointer
491 * AP bus poll thread. The purpose of this thread is to poll for
492 * finished requests in a loop if there is a "free" cpu - that is
493 * a cpu that doesn't have anything better to do. The polling stops
494 * as soon as there is another task or if all messages have been
497 static int ap_poll_thread(void *data)
499 DECLARE_WAITQUEUE(wait, current);
501 set_user_nice(current, MAX_NICE);
503 while (!kthread_should_stop()) {
504 add_wait_queue(&ap_poll_wait, &wait);
505 set_current_state(TASK_INTERRUPTIBLE);
506 if (!ap_pending_requests()) {
510 set_current_state(TASK_RUNNING);
511 remove_wait_queue(&ap_poll_wait, &wait);
512 if (need_resched()) {
523 static int ap_poll_thread_start(void)
527 if (ap_using_interrupts() || ap_poll_kthread)
529 mutex_lock(&ap_poll_thread_mutex);
530 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
531 rc = PTR_ERR_OR_ZERO(ap_poll_kthread);
533 ap_poll_kthread = NULL;
534 mutex_unlock(&ap_poll_thread_mutex);
538 static void ap_poll_thread_stop(void)
540 if (!ap_poll_kthread)
542 mutex_lock(&ap_poll_thread_mutex);
543 kthread_stop(ap_poll_kthread);
544 ap_poll_kthread = NULL;
545 mutex_unlock(&ap_poll_thread_mutex);
548 #define is_card_dev(x) ((x)->parent == ap_root_device)
549 #define is_queue_dev(x) ((x)->parent != ap_root_device)
553 * @dev: Pointer to device
554 * @drv: Pointer to device_driver
556 * AP bus driver registration/unregistration.
558 static int ap_bus_match(struct device *dev, struct device_driver *drv)
560 struct ap_driver *ap_drv = to_ap_drv(drv);
561 struct ap_device_id *id;
564 * Compare device type of the device with the list of
565 * supported types of the device_driver.
567 for (id = ap_drv->ids; id->match_flags; id++) {
568 if (is_card_dev(dev) &&
569 id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE &&
570 id->dev_type == to_ap_dev(dev)->device_type)
572 if (is_queue_dev(dev) &&
573 id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE &&
574 id->dev_type == to_ap_dev(dev)->device_type)
581 * ap_uevent(): Uevent function for AP devices.
582 * @dev: Pointer to device
583 * @env: Pointer to kobj_uevent_env
585 * It sets up a single environment variable DEV_TYPE which contains the
586 * hardware device type.
588 static int ap_uevent(struct device *dev, struct kobj_uevent_env *env)
591 struct ap_device *ap_dev = to_ap_dev(dev);
593 /* Uevents from ap bus core don't need extensions to the env */
594 if (dev == ap_root_device)
597 if (is_card_dev(dev)) {
598 struct ap_card *ac = to_ap_card(&ap_dev->device);
600 /* Set up DEV_TYPE environment variable. */
601 rc = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
605 rc = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
609 /* Add MODE=<accel|cca|ep11> */
610 if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL))
611 rc = add_uevent_var(env, "MODE=accel");
612 else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO))
613 rc = add_uevent_var(env, "MODE=cca");
614 else if (ap_test_bit(&ac->functions, AP_FUNC_EP11))
615 rc = add_uevent_var(env, "MODE=ep11");
619 struct ap_queue *aq = to_ap_queue(&ap_dev->device);
621 /* Add MODE=<accel|cca|ep11> */
622 if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL))
623 rc = add_uevent_var(env, "MODE=accel");
624 else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO))
625 rc = add_uevent_var(env, "MODE=cca");
626 else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11))
627 rc = add_uevent_var(env, "MODE=ep11");
635 static void ap_send_init_scan_done_uevent(void)
637 char *envp[] = { "INITSCAN=done", NULL };
639 kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
642 static void ap_send_bindings_complete_uevent(void)
645 char *envp[] = { "BINDINGS=complete", buf, NULL };
647 snprintf(buf, sizeof(buf), "COMPLETECOUNT=%llu",
648 atomic64_inc_return(&ap_bindings_complete_count));
649 kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
652 void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg)
655 char *envp[] = { buf, NULL };
657 snprintf(buf, sizeof(buf), "CONFIG=%d", cfg ? 1 : 0);
659 kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp);
661 EXPORT_SYMBOL(ap_send_config_uevent);
663 void ap_send_online_uevent(struct ap_device *ap_dev, int online)
666 char *envp[] = { buf, NULL };
668 snprintf(buf, sizeof(buf), "ONLINE=%d", online ? 1 : 0);
670 kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp);
672 EXPORT_SYMBOL(ap_send_online_uevent);
675 * calc # of bound APQNs
678 struct __ap_calc_ctrs {
683 static int __ap_calc_helper(struct device *dev, void *arg)
685 struct __ap_calc_ctrs *pctrs = (struct __ap_calc_ctrs *) arg;
687 if (is_queue_dev(dev)) {
689 if ((to_ap_dev(dev))->drv)
696 static void ap_calc_bound_apqns(unsigned int *apqns, unsigned int *bound)
698 struct __ap_calc_ctrs ctrs;
700 memset(&ctrs, 0, sizeof(ctrs));
701 bus_for_each_dev(&ap_bus_type, NULL, (void *) &ctrs, __ap_calc_helper);
708 * After initial ap bus scan do check if all existing APQNs are
709 * bound to device drivers.
711 static void ap_check_bindings_complete(void)
713 unsigned int apqns, bound;
715 if (atomic64_read(&ap_scan_bus_count) >= 1) {
716 ap_calc_bound_apqns(&apqns, &bound);
717 if (bound == apqns) {
718 if (!completion_done(&ap_init_apqn_bindings_complete)) {
719 complete_all(&ap_init_apqn_bindings_complete);
720 AP_DBF(DBF_INFO, "%s complete\n", __func__);
722 ap_send_bindings_complete_uevent();
728 * Interface to wait for the AP bus to have done one initial ap bus
729 * scan and all detected APQNs have been bound to device drivers.
730 * If these both conditions are not fulfilled, this function blocks
731 * on a condition with wait_for_completion_interruptible_timeout().
732 * If these both conditions are fulfilled (before the timeout hits)
733 * the return value is 0. If the timeout (in jiffies) hits instead
734 * -ETIME is returned. On failures negative return values are
735 * returned to the caller.
737 int ap_wait_init_apqn_bindings_complete(unsigned long timeout)
741 if (completion_done(&ap_init_apqn_bindings_complete))
745 l = wait_for_completion_interruptible_timeout(
746 &ap_init_apqn_bindings_complete, timeout);
748 l = wait_for_completion_interruptible(
749 &ap_init_apqn_bindings_complete);
751 return l == -ERESTARTSYS ? -EINTR : l;
752 else if (l == 0 && timeout)
757 EXPORT_SYMBOL(ap_wait_init_apqn_bindings_complete);
759 static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data)
761 if (is_queue_dev(dev) &&
762 AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data)
763 device_unregister(dev);
767 static int __ap_revise_reserved(struct device *dev, void *dummy)
769 int rc, card, queue, devres, drvres;
771 if (is_queue_dev(dev)) {
772 card = AP_QID_CARD(to_ap_queue(dev)->qid);
773 queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
774 mutex_lock(&ap_perms_mutex);
775 devres = test_bit_inv(card, ap_perms.apm)
776 && test_bit_inv(queue, ap_perms.aqm);
777 mutex_unlock(&ap_perms_mutex);
778 drvres = to_ap_drv(dev->driver)->flags
779 & AP_DRIVER_FLAG_DEFAULT;
780 if (!!devres != !!drvres) {
781 AP_DBF_DBG("reprobing queue=%02x.%04x\n",
783 rc = device_reprobe(dev);
790 static void ap_bus_revise_bindings(void)
792 bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
795 int ap_owned_by_def_drv(int card, int queue)
799 if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
802 mutex_lock(&ap_perms_mutex);
804 if (test_bit_inv(card, ap_perms.apm)
805 && test_bit_inv(queue, ap_perms.aqm))
808 mutex_unlock(&ap_perms_mutex);
812 EXPORT_SYMBOL(ap_owned_by_def_drv);
814 int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
817 int card, queue, rc = 0;
819 mutex_lock(&ap_perms_mutex);
821 for (card = 0; !rc && card < AP_DEVICES; card++)
822 if (test_bit_inv(card, apm) &&
823 test_bit_inv(card, ap_perms.apm))
824 for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
825 if (test_bit_inv(queue, aqm) &&
826 test_bit_inv(queue, ap_perms.aqm))
829 mutex_unlock(&ap_perms_mutex);
833 EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
835 static int ap_device_probe(struct device *dev)
837 struct ap_device *ap_dev = to_ap_dev(dev);
838 struct ap_driver *ap_drv = to_ap_drv(dev->driver);
839 int card, queue, devres, drvres, rc = -ENODEV;
841 if (!get_device(dev))
844 if (is_queue_dev(dev)) {
846 * If the apqn is marked as reserved/used by ap bus and
847 * default drivers, only probe with drivers with the default
848 * flag set. If it is not marked, only probe with drivers
849 * with the default flag not set.
851 card = AP_QID_CARD(to_ap_queue(dev)->qid);
852 queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
853 mutex_lock(&ap_perms_mutex);
854 devres = test_bit_inv(card, ap_perms.apm)
855 && test_bit_inv(queue, ap_perms.aqm);
856 mutex_unlock(&ap_perms_mutex);
857 drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
858 if (!!devres != !!drvres)
862 /* Add queue/card to list of active queues/cards */
863 spin_lock_bh(&ap_queues_lock);
864 if (is_queue_dev(dev))
865 hash_add(ap_queues, &to_ap_queue(dev)->hnode,
866 to_ap_queue(dev)->qid);
867 spin_unlock_bh(&ap_queues_lock);
869 ap_dev->drv = ap_drv;
870 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
873 spin_lock_bh(&ap_queues_lock);
874 if (is_queue_dev(dev))
875 hash_del(&to_ap_queue(dev)->hnode);
876 spin_unlock_bh(&ap_queues_lock);
879 ap_check_bindings_complete();
887 static int ap_device_remove(struct device *dev)
889 struct ap_device *ap_dev = to_ap_dev(dev);
890 struct ap_driver *ap_drv = ap_dev->drv;
892 /* prepare ap queue device removal */
893 if (is_queue_dev(dev))
894 ap_queue_prepare_remove(to_ap_queue(dev));
896 /* driver's chance to clean up gracefully */
898 ap_drv->remove(ap_dev);
900 /* now do the ap queue device remove */
901 if (is_queue_dev(dev))
902 ap_queue_remove(to_ap_queue(dev));
904 /* Remove queue/card from list of active queues/cards */
905 spin_lock_bh(&ap_queues_lock);
906 if (is_queue_dev(dev))
907 hash_del(&to_ap_queue(dev)->hnode);
908 spin_unlock_bh(&ap_queues_lock);
916 struct ap_queue *ap_get_qdev(ap_qid_t qid)
921 spin_lock_bh(&ap_queues_lock);
922 hash_for_each(ap_queues, bkt, aq, hnode) {
923 if (aq->qid == qid) {
924 get_device(&aq->ap_dev.device);
925 spin_unlock_bh(&ap_queues_lock);
929 spin_unlock_bh(&ap_queues_lock);
933 EXPORT_SYMBOL(ap_get_qdev);
935 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
938 struct device_driver *drv = &ap_drv->driver;
940 drv->bus = &ap_bus_type;
943 return driver_register(drv);
945 EXPORT_SYMBOL(ap_driver_register);
947 void ap_driver_unregister(struct ap_driver *ap_drv)
949 driver_unregister(&ap_drv->driver);
951 EXPORT_SYMBOL(ap_driver_unregister);
953 void ap_bus_force_rescan(void)
955 /* processing a asynchronous bus rescan */
956 del_timer(&ap_config_timer);
957 queue_work(system_long_wq, &ap_scan_work);
958 flush_work(&ap_scan_work);
960 EXPORT_SYMBOL(ap_bus_force_rescan);
963 * A config change has happened, force an ap bus rescan.
965 void ap_bus_cfg_chg(void)
967 AP_DBF_DBG("%s config change, forcing bus rescan\n", __func__);
969 ap_bus_force_rescan();
973 * hex2bitmap() - parse hex mask string and set bitmap.
974 * Valid strings are "0x012345678" with at least one valid hex number.
975 * Rest of the bitmap to the right is padded with 0. No spaces allowed
976 * within the string, the leading 0x may be omitted.
977 * Returns the bitmask with exactly the bits set as given by the hex
978 * string (both in big endian order).
980 static int hex2bitmap(const char *str, unsigned long *bitmap, int bits)
984 /* bits needs to be a multiple of 8 */
988 if (str[0] == '0' && str[1] == 'x')
993 for (i = 0; isxdigit(*str) && i < bits; str++) {
994 b = hex_to_bin(*str);
995 for (n = 0; n < 4; n++)
997 set_bit_inv(i + n, bitmap);
1009 * modify_bitmap() - parse bitmask argument and modify an existing
1010 * bit mask accordingly. A concatenation (done with ',') of these
1011 * terms is recognized:
1012 * +<bitnr>[-<bitnr>] or -<bitnr>[-<bitnr>]
1013 * <bitnr> may be any valid number (hex, decimal or octal) in the range
1014 * 0...bits-1; the leading + or - is required. Here are some examples:
1015 * +0-15,+32,-128,-0xFF
1016 * -0-255,+1-16,+0x128
1017 * +1,+2,+3,+4,-5,-7-10
1018 * Returns the new bitmap after all changes have been applied. Every
1019 * positive value in the string will set a bit and every negative value
1020 * in the string will clear a bit. As a bit may be touched more than once,
1021 * the last 'operation' wins:
1022 * +0-255,-128 = first bits 0-255 will be set, then bit 128 will be
1023 * cleared again. All other bits are unmodified.
1025 static int modify_bitmap(const char *str, unsigned long *bitmap, int bits)
1030 /* bits needs to be a multiple of 8 */
1036 if (sign != '+' && sign != '-')
1038 a = z = simple_strtoul(str, &np, 0);
1039 if (str == np || a >= bits)
1043 z = simple_strtoul(++str, &np, 0);
1044 if (str == np || a > z || z >= bits)
1048 for (i = a; i <= z; i++)
1050 set_bit_inv(i, bitmap);
1052 clear_bit_inv(i, bitmap);
1053 while (*str == ',' || *str == '\n')
1060 int ap_parse_mask_str(const char *str,
1061 unsigned long *bitmap, int bits,
1064 unsigned long *newmap, size;
1067 /* bits needs to be a multiple of 8 */
1071 size = BITS_TO_LONGS(bits)*sizeof(unsigned long);
1072 newmap = kmalloc(size, GFP_KERNEL);
1075 if (mutex_lock_interruptible(lock)) {
1077 return -ERESTARTSYS;
1080 if (*str == '+' || *str == '-') {
1081 memcpy(newmap, bitmap, size);
1082 rc = modify_bitmap(str, newmap, bits);
1084 memset(newmap, 0, size);
1085 rc = hex2bitmap(str, newmap, bits);
1088 memcpy(bitmap, newmap, size);
1093 EXPORT_SYMBOL(ap_parse_mask_str);
1096 * AP bus attributes.
1099 static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
1101 return scnprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
1104 static ssize_t ap_domain_store(struct bus_type *bus,
1105 const char *buf, size_t count)
1109 if (sscanf(buf, "%i\n", &domain) != 1 ||
1110 domain < 0 || domain > ap_max_domain_id ||
1111 !test_bit_inv(domain, ap_perms.aqm))
1114 spin_lock_bh(&ap_domain_lock);
1115 ap_domain_index = domain;
1116 spin_unlock_bh(&ap_domain_lock);
1118 AP_DBF_INFO("stored new default domain=%d\n", domain);
1123 static BUS_ATTR_RW(ap_domain);
1125 static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
1127 if (!ap_qci_info) /* QCI not supported */
1128 return scnprintf(buf, PAGE_SIZE, "not supported\n");
1130 return scnprintf(buf, PAGE_SIZE,
1131 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1132 ap_qci_info->adm[0], ap_qci_info->adm[1],
1133 ap_qci_info->adm[2], ap_qci_info->adm[3],
1134 ap_qci_info->adm[4], ap_qci_info->adm[5],
1135 ap_qci_info->adm[6], ap_qci_info->adm[7]);
1138 static BUS_ATTR_RO(ap_control_domain_mask);
1140 static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
1142 if (!ap_qci_info) /* QCI not supported */
1143 return scnprintf(buf, PAGE_SIZE, "not supported\n");
1145 return scnprintf(buf, PAGE_SIZE,
1146 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1147 ap_qci_info->aqm[0], ap_qci_info->aqm[1],
1148 ap_qci_info->aqm[2], ap_qci_info->aqm[3],
1149 ap_qci_info->aqm[4], ap_qci_info->aqm[5],
1150 ap_qci_info->aqm[6], ap_qci_info->aqm[7]);
1153 static BUS_ATTR_RO(ap_usage_domain_mask);
1155 static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
1157 if (!ap_qci_info) /* QCI not supported */
1158 return scnprintf(buf, PAGE_SIZE, "not supported\n");
1160 return scnprintf(buf, PAGE_SIZE,
1161 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
1162 ap_qci_info->apm[0], ap_qci_info->apm[1],
1163 ap_qci_info->apm[2], ap_qci_info->apm[3],
1164 ap_qci_info->apm[4], ap_qci_info->apm[5],
1165 ap_qci_info->apm[6], ap_qci_info->apm[7]);
1168 static BUS_ATTR_RO(ap_adapter_mask);
1170 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
1172 return scnprintf(buf, PAGE_SIZE, "%d\n",
1173 ap_using_interrupts() ? 1 : 0);
1176 static BUS_ATTR_RO(ap_interrupts);
1178 static ssize_t config_time_show(struct bus_type *bus, char *buf)
1180 return scnprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
1183 static ssize_t config_time_store(struct bus_type *bus,
1184 const char *buf, size_t count)
1188 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
1190 ap_config_time = time;
1191 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1195 static BUS_ATTR_RW(config_time);
1197 static ssize_t poll_thread_show(struct bus_type *bus, char *buf)
1199 return scnprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
1202 static ssize_t poll_thread_store(struct bus_type *bus,
1203 const char *buf, size_t count)
1207 if (sscanf(buf, "%d\n", &flag) != 1)
1210 rc = ap_poll_thread_start();
1214 ap_poll_thread_stop();
1218 static BUS_ATTR_RW(poll_thread);
1220 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
1222 return scnprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
1225 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
1228 unsigned long long time;
1231 /* 120 seconds = maximum poll interval */
1232 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
1233 time > 120000000000ULL)
1235 poll_timeout = time;
1236 hr_time = poll_timeout;
1238 spin_lock_bh(&ap_poll_timer_lock);
1239 hrtimer_cancel(&ap_poll_timer);
1240 hrtimer_set_expires(&ap_poll_timer, hr_time);
1241 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
1242 spin_unlock_bh(&ap_poll_timer_lock);
1247 static BUS_ATTR_RW(poll_timeout);
1249 static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
1251 return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_domain_id);
1254 static BUS_ATTR_RO(ap_max_domain_id);
1256 static ssize_t ap_max_adapter_id_show(struct bus_type *bus, char *buf)
1258 return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_adapter_id);
1261 static BUS_ATTR_RO(ap_max_adapter_id);
1263 static ssize_t apmask_show(struct bus_type *bus, char *buf)
1267 if (mutex_lock_interruptible(&ap_perms_mutex))
1268 return -ERESTARTSYS;
1269 rc = scnprintf(buf, PAGE_SIZE,
1270 "0x%016lx%016lx%016lx%016lx\n",
1271 ap_perms.apm[0], ap_perms.apm[1],
1272 ap_perms.apm[2], ap_perms.apm[3]);
1273 mutex_unlock(&ap_perms_mutex);
1278 static ssize_t apmask_store(struct bus_type *bus, const char *buf,
1283 rc = ap_parse_mask_str(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex);
1287 ap_bus_revise_bindings();
1292 static BUS_ATTR_RW(apmask);
1294 static ssize_t aqmask_show(struct bus_type *bus, char *buf)
1298 if (mutex_lock_interruptible(&ap_perms_mutex))
1299 return -ERESTARTSYS;
1300 rc = scnprintf(buf, PAGE_SIZE,
1301 "0x%016lx%016lx%016lx%016lx\n",
1302 ap_perms.aqm[0], ap_perms.aqm[1],
1303 ap_perms.aqm[2], ap_perms.aqm[3]);
1304 mutex_unlock(&ap_perms_mutex);
1309 static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
1314 rc = ap_parse_mask_str(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex);
1318 ap_bus_revise_bindings();
1323 static BUS_ATTR_RW(aqmask);
1325 static ssize_t scans_show(struct bus_type *bus, char *buf)
1327 return scnprintf(buf, PAGE_SIZE, "%llu\n",
1328 atomic64_read(&ap_scan_bus_count));
1331 static BUS_ATTR_RO(scans);
1333 static ssize_t bindings_show(struct bus_type *bus, char *buf)
1336 unsigned int apqns, n;
1338 ap_calc_bound_apqns(&apqns, &n);
1339 if (atomic64_read(&ap_scan_bus_count) >= 1 && n == apqns)
1340 rc = scnprintf(buf, PAGE_SIZE, "%u/%u (complete)\n", n, apqns);
1342 rc = scnprintf(buf, PAGE_SIZE, "%u/%u\n", n, apqns);
1347 static BUS_ATTR_RO(bindings);
1349 static struct attribute *ap_bus_attrs[] = {
1350 &bus_attr_ap_domain.attr,
1351 &bus_attr_ap_control_domain_mask.attr,
1352 &bus_attr_ap_usage_domain_mask.attr,
1353 &bus_attr_ap_adapter_mask.attr,
1354 &bus_attr_config_time.attr,
1355 &bus_attr_poll_thread.attr,
1356 &bus_attr_ap_interrupts.attr,
1357 &bus_attr_poll_timeout.attr,
1358 &bus_attr_ap_max_domain_id.attr,
1359 &bus_attr_ap_max_adapter_id.attr,
1360 &bus_attr_apmask.attr,
1361 &bus_attr_aqmask.attr,
1362 &bus_attr_scans.attr,
1363 &bus_attr_bindings.attr,
1366 ATTRIBUTE_GROUPS(ap_bus);
1368 static struct bus_type ap_bus_type = {
1370 .bus_groups = ap_bus_groups,
1371 .match = &ap_bus_match,
1372 .uevent = &ap_uevent,
1373 .probe = ap_device_probe,
1374 .remove = ap_device_remove,
1378 * ap_select_domain(): Select an AP domain if possible and we haven't
1379 * already done so before.
1381 static void ap_select_domain(void)
1383 struct ap_queue_status status;
1387 * Choose the default domain. Either the one specified with
1388 * the "domain=" parameter or the first domain with at least
1391 spin_lock_bh(&ap_domain_lock);
1392 if (ap_domain_index >= 0) {
1393 /* Domain has already been selected. */
1396 for (dom = 0; dom <= ap_max_domain_id; dom++) {
1397 if (!ap_test_config_usage_domain(dom) ||
1398 !test_bit_inv(dom, ap_perms.aqm))
1400 for (card = 0; card <= ap_max_adapter_id; card++) {
1401 if (!ap_test_config_card_id(card) ||
1402 !test_bit_inv(card, ap_perms.apm))
1404 status = ap_test_queue(AP_MKQID(card, dom),
1405 ap_apft_available(),
1407 if (status.response_code == AP_RESPONSE_NORMAL)
1410 if (card <= ap_max_adapter_id)
1413 if (dom <= ap_max_domain_id) {
1414 ap_domain_index = dom;
1415 AP_DBF_INFO("%s new default domain is %d\n",
1416 __func__, ap_domain_index);
1419 spin_unlock_bh(&ap_domain_lock);
1423 * This function checks the type and returns either 0 for not
1424 * supported or the highest compatible type value (which may
1425 * include the input type value).
1427 static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func)
1431 /* < CEX2A is not supported */
1432 if (rawtype < AP_DEVICE_TYPE_CEX2A) {
1433 AP_DBF_WARN("get_comp_type queue=%02x.%04x unsupported type %d\n",
1434 AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
1437 /* up to CEX7 known and fully supported */
1438 if (rawtype <= AP_DEVICE_TYPE_CEX7)
1441 * unknown new type > CEX7, check for compatibility
1442 * to the highest known and supported type which is
1443 * currently CEX7 with the help of the QACT function.
1445 if (ap_qact_available()) {
1446 struct ap_queue_status status;
1447 union ap_qact_ap_info apinfo = {0};
1449 apinfo.mode = (func >> 26) & 0x07;
1450 apinfo.cat = AP_DEVICE_TYPE_CEX7;
1451 status = ap_qact(qid, 0, &apinfo);
1452 if (status.response_code == AP_RESPONSE_NORMAL
1453 && apinfo.cat >= AP_DEVICE_TYPE_CEX2A
1454 && apinfo.cat <= AP_DEVICE_TYPE_CEX7)
1455 comp_type = apinfo.cat;
1458 AP_DBF_WARN("get_comp_type queue=%02x.%04x unable to map type %d\n",
1459 AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
1460 else if (comp_type != rawtype)
1461 AP_DBF_INFO("get_comp_type queue=%02x.%04x map type %d to %d\n",
1462 AP_QID_CARD(qid), AP_QID_QUEUE(qid),
1463 rawtype, comp_type);
1468 * Helper function to be used with bus_find_dev
1469 * matches for the card device with the given id
1471 static int __match_card_device_with_id(struct device *dev, const void *data)
1473 return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long)(void *) data;
1477 * Helper function to be used with bus_find_dev
1478 * matches for the queue device with a given qid
1480 static int __match_queue_device_with_qid(struct device *dev, const void *data)
1482 return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
1486 * Helper function to be used with bus_find_dev
1487 * matches any queue device with given queue id
1489 static int __match_queue_device_with_queue_id(struct device *dev, const void *data)
1491 return is_queue_dev(dev)
1492 && AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long) data;
1496 * Helper function for ap_scan_bus().
1497 * Remove card device and associated queue devices.
1499 static inline void ap_scan_rm_card_dev_and_queue_devs(struct ap_card *ac)
1501 bus_for_each_dev(&ap_bus_type, NULL,
1502 (void *)(long) ac->id,
1503 __ap_queue_devices_with_id_unregister);
1504 device_unregister(&ac->ap_dev.device);
1508 * Helper function for ap_scan_bus().
1509 * Does the scan bus job for all the domains within
1510 * a valid adapter given by an ap_card ptr.
1512 static inline void ap_scan_domains(struct ap_card *ac)
1518 struct ap_queue *aq;
1519 int rc, dom, depth, type;
1522 * Go through the configuration for the domains and compare them
1523 * to the existing queue devices. Also take care of the config
1524 * and error state for the queue devices.
1527 for (dom = 0; dom <= ap_max_domain_id; dom++) {
1528 qid = AP_MKQID(ac->id, dom);
1529 dev = bus_find_device(&ap_bus_type, NULL,
1531 __match_queue_device_with_qid);
1532 aq = dev ? to_ap_queue(dev) : NULL;
1533 if (!ap_test_config_usage_domain(dom)) {
1535 AP_DBF_INFO("%s(%d,%d) not in config any more, rm queue device\n",
1536 __func__, ac->id, dom);
1537 device_unregister(dev);
1542 /* domain is valid, get info from this APQN */
1543 if (!ap_queue_info(qid, &type, &func, &depth, &decfg)) {
1546 "%s(%d,%d) ap_queue_info() not successful, rm queue device\n",
1547 __func__, ac->id, dom);
1548 device_unregister(dev);
1553 /* if no queue device exists, create a new one */
1555 aq = ap_queue_create(qid, ac->ap_dev.device_type);
1557 AP_DBF_WARN("%s(%d,%d) ap_queue_create() failed\n",
1558 __func__, ac->id, dom);
1562 aq->config = !decfg;
1563 dev = &aq->ap_dev.device;
1564 dev->bus = &ap_bus_type;
1565 dev->parent = &ac->ap_dev.device;
1566 dev_set_name(dev, "%02x.%04x", ac->id, dom);
1567 /* register queue device */
1568 rc = device_register(dev);
1570 AP_DBF_WARN("%s(%d,%d) device_register() failed\n",
1571 __func__, ac->id, dom);
1572 goto put_dev_and_continue;
1574 /* get it and thus adjust reference counter */
1577 AP_DBF_INFO("%s(%d,%d) new (decfg) queue device created\n",
1578 __func__, ac->id, dom);
1580 AP_DBF_INFO("%s(%d,%d) new queue device created\n",
1581 __func__, ac->id, dom);
1582 goto put_dev_and_continue;
1584 /* Check config state on the already existing queue device */
1585 spin_lock_bh(&aq->lock);
1586 if (decfg && aq->config) {
1587 /* config off this queue device */
1589 if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
1590 aq->dev_state = AP_DEV_STATE_ERROR;
1591 aq->last_err_rc = AP_RESPONSE_DECONFIGURED;
1593 spin_unlock_bh(&aq->lock);
1594 AP_DBF_INFO("%s(%d,%d) queue device config off\n",
1595 __func__, ac->id, dom);
1596 ap_send_config_uevent(&aq->ap_dev, aq->config);
1597 /* 'receive' pending messages with -EAGAIN */
1599 goto put_dev_and_continue;
1601 if (!decfg && !aq->config) {
1602 /* config on this queue device */
1604 if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
1605 aq->dev_state = AP_DEV_STATE_OPERATING;
1606 aq->sm_state = AP_SM_STATE_RESET_START;
1608 spin_unlock_bh(&aq->lock);
1609 AP_DBF_INFO("%s(%d,%d) queue device config on\n",
1610 __func__, ac->id, dom);
1611 ap_send_config_uevent(&aq->ap_dev, aq->config);
1612 goto put_dev_and_continue;
1614 /* handle other error states */
1615 if (!decfg && aq->dev_state == AP_DEV_STATE_ERROR) {
1616 spin_unlock_bh(&aq->lock);
1617 /* 'receive' pending messages with -EAGAIN */
1619 /* re-init (with reset) the queue device */
1620 ap_queue_init_state(aq);
1621 AP_DBF_INFO("%s(%d,%d) queue device reinit enforced\n",
1622 __func__, ac->id, dom);
1623 goto put_dev_and_continue;
1625 spin_unlock_bh(&aq->lock);
1626 put_dev_and_continue:
1632 * Helper function for ap_scan_bus().
1633 * Does the scan bus job for the given adapter id.
1635 static inline void ap_scan_adapter(int ap)
1642 int rc, dom, depth, type, comp_type;
1644 /* Is there currently a card device for this adapter ? */
1645 dev = bus_find_device(&ap_bus_type, NULL,
1647 __match_card_device_with_id);
1648 ac = dev ? to_ap_card(dev) : NULL;
1650 /* Adapter not in configuration ? */
1651 if (!ap_test_config_card_id(ap)) {
1653 AP_DBF_INFO("%s(%d) ap not in config any more, rm card and queue devices\n",
1655 ap_scan_rm_card_dev_and_queue_devs(ac);
1662 * Adapter ap is valid in the current configuration. So do some checks:
1663 * If no card device exists, build one. If a card device exists, check
1664 * for type and functions changed. For all this we need to find a valid
1668 for (dom = 0; dom <= ap_max_domain_id; dom++)
1669 if (ap_test_config_usage_domain(dom)) {
1670 qid = AP_MKQID(ap, dom);
1671 if (ap_queue_info(qid, &type, &func, &depth, &decfg))
1674 if (dom > ap_max_domain_id) {
1675 /* Could not find a valid APQN for this adapter */
1678 "%s(%d) no type info (no APQN found), rm card and queue devices\n",
1680 ap_scan_rm_card_dev_and_queue_devs(ac);
1683 AP_DBF_DBG("%s(%d) no type info (no APQN found), ignored\n",
1689 /* No apdater type info available, an unusable adapter */
1691 AP_DBF_INFO("%s(%d) no valid type (0) info, rm card and queue devices\n",
1693 ap_scan_rm_card_dev_and_queue_devs(ac);
1696 AP_DBF_DBG("%s(%d) no valid type (0) info, ignored\n",
1703 /* Check APQN against existing card device for changes */
1704 if (ac->raw_hwtype != type) {
1705 AP_DBF_INFO("%s(%d) hwtype %d changed, rm card and queue devices\n",
1706 __func__, ap, type);
1707 ap_scan_rm_card_dev_and_queue_devs(ac);
1710 } else if (ac->functions != func) {
1711 AP_DBF_INFO("%s(%d) functions 0x%08x changed, rm card and queue devices\n",
1712 __func__, ap, type);
1713 ap_scan_rm_card_dev_and_queue_devs(ac);
1717 if (decfg && ac->config) {
1719 AP_DBF_INFO("%s(%d) card device config off\n",
1721 ap_send_config_uevent(&ac->ap_dev, ac->config);
1723 if (!decfg && !ac->config) {
1725 AP_DBF_INFO("%s(%d) card device config on\n",
1727 ap_send_config_uevent(&ac->ap_dev, ac->config);
1733 /* Build a new card device */
1734 comp_type = ap_get_compatible_type(qid, type, func);
1736 AP_DBF_WARN("%s(%d) type %d, can't get compatibility type\n",
1737 __func__, ap, type);
1740 ac = ap_card_create(ap, depth, type, comp_type, func);
1742 AP_DBF_WARN("%s(%d) ap_card_create() failed\n",
1746 ac->config = !decfg;
1747 dev = &ac->ap_dev.device;
1748 dev->bus = &ap_bus_type;
1749 dev->parent = ap_root_device;
1750 dev_set_name(dev, "card%02x", ap);
1751 /* Register the new card device with AP bus */
1752 rc = device_register(dev);
1754 AP_DBF_WARN("%s(%d) device_register() failed\n",
1759 /* get it and thus adjust reference counter */
1762 AP_DBF_INFO("%s(%d) new (decfg) card device type=%d func=0x%08x created\n",
1763 __func__, ap, type, func);
1765 AP_DBF_INFO("%s(%d) new card device type=%d func=0x%08x created\n",
1766 __func__, ap, type, func);
1769 /* Verify the domains and the queue devices for this card */
1770 ap_scan_domains(ac);
1772 /* release the card device */
1773 put_device(&ac->ap_dev.device);
1777 * ap_scan_bus(): Scan the AP bus for new devices
1778 * Runs periodically, workqueue timer (ap_config_time)
1780 static void ap_scan_bus(struct work_struct *unused)
1784 ap_fetch_qci_info(ap_qci_info);
1787 AP_DBF_DBG("%s running\n", __func__);
1789 /* loop over all possible adapters */
1790 for (ap = 0; ap <= ap_max_adapter_id; ap++)
1791 ap_scan_adapter(ap);
1793 /* check if there is at least one queue available with default domain */
1794 if (ap_domain_index >= 0) {
1795 struct device *dev =
1796 bus_find_device(&ap_bus_type, NULL,
1797 (void *)(long) ap_domain_index,
1798 __match_queue_device_with_queue_id);
1802 AP_DBF_INFO("no queue device with default domain %d available\n",
1806 if (atomic64_inc_return(&ap_scan_bus_count) == 1) {
1807 AP_DBF(DBF_DEBUG, "%s init scan complete\n", __func__);
1808 ap_send_init_scan_done_uevent();
1809 ap_check_bindings_complete();
1812 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
1815 static void ap_config_timeout(struct timer_list *unused)
1817 queue_work(system_long_wq, &ap_scan_work);
1820 static int __init ap_debug_init(void)
1822 ap_dbf_info = debug_register("ap", 1, 1,
1823 DBF_MAX_SPRINTF_ARGS * sizeof(long));
1824 debug_register_view(ap_dbf_info, &debug_sprintf_view);
1825 debug_set_level(ap_dbf_info, DBF_ERR);
1830 static void __init ap_perms_init(void)
1832 /* all resources useable if no kernel parameter string given */
1833 memset(&ap_perms.ioctlm, 0xFF, sizeof(ap_perms.ioctlm));
1834 memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm));
1835 memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm));
1837 /* apm kernel parameter string */
1839 memset(&ap_perms.apm, 0, sizeof(ap_perms.apm));
1840 ap_parse_mask_str(apm_str, ap_perms.apm, AP_DEVICES,
1844 /* aqm kernel parameter string */
1846 memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm));
1847 ap_parse_mask_str(aqm_str, ap_perms.aqm, AP_DOMAINS,
1853 * ap_module_init(): The module initialization code.
1855 * Initializes the module.
1857 static int __init ap_module_init(void)
1861 rc = ap_debug_init();
1865 if (!ap_instructions_available()) {
1866 pr_warn("The hardware system does not support AP instructions\n");
1870 /* init ap_queue hashtable */
1871 hash_init(ap_queues);
1873 /* set up the AP permissions (ioctls, ap and aq masks) */
1876 /* Get AP configuration data if available */
1879 /* check default domain setting */
1880 if (ap_domain_index < -1 || ap_domain_index > ap_max_domain_id ||
1881 (ap_domain_index >= 0 &&
1882 !test_bit_inv(ap_domain_index, ap_perms.aqm))) {
1883 pr_warn("%d is not a valid cryptographic domain\n",
1885 ap_domain_index = -1;
1888 /* enable interrupts if available */
1889 if (ap_interrupts_available()) {
1890 rc = register_adapter_interrupt(&ap_airq);
1891 ap_airq_flag = (rc == 0);
1894 /* Create /sys/bus/ap. */
1895 rc = bus_register(&ap_bus_type);
1899 /* Create /sys/devices/ap. */
1900 ap_root_device = root_device_register("ap");
1901 rc = PTR_ERR_OR_ZERO(ap_root_device);
1904 ap_root_device->bus = &ap_bus_type;
1906 /* Setup the AP bus rescan timer. */
1907 timer_setup(&ap_config_timer, ap_config_timeout, 0);
1910 * Setup the high resultion poll timer.
1911 * If we are running under z/VM adjust polling to z/VM polling rate.
1914 poll_timeout = 1500000;
1915 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1916 ap_poll_timer.function = ap_poll_timeout;
1918 /* Start the low priority AP bus poll thread. */
1919 if (ap_thread_flag) {
1920 rc = ap_poll_thread_start();
1925 queue_work(system_long_wq, &ap_scan_work);
1930 hrtimer_cancel(&ap_poll_timer);
1931 root_device_unregister(ap_root_device);
1933 bus_unregister(&ap_bus_type);
1935 if (ap_using_interrupts())
1936 unregister_adapter_interrupt(&ap_airq);
1940 device_initcall(ap_module_init);