// SPDX-License-Identifier: GPL-2.0+ /* * Copyright IBM Corp. 2006, 2012 * Author(s): Cornelia Huck * Martin Schwidefsky * Ralph Wuerthner * Felix Beck * Holger Dengler * * Adjunct processor bus. */ #define KMSG_COMPONENT "ap" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ap_bus.h" #include "ap_debug.h" /* * Module parameters; note though this file itself isn't modular. */ int ap_domain_index = -1; /* Adjunct Processor Domain Index */ static DEFINE_SPINLOCK(ap_domain_lock); module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP); MODULE_PARM_DESC(domain, "domain index for ap devices"); EXPORT_SYMBOL(ap_domain_index); static int ap_thread_flag = 0; module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP); MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); static struct device *ap_root_device; DEFINE_SPINLOCK(ap_list_lock); LIST_HEAD(ap_card_list); static struct ap_config_info *ap_configuration; static bool initialised; /* * AP bus related debug feature things. */ debug_info_t *ap_dbf_info; /* * Workqueue timer for bus rescan. */ static struct timer_list ap_config_timer; static int ap_config_time = AP_CONFIG_TIME; static void ap_scan_bus(struct work_struct *); static DECLARE_WORK(ap_scan_work, ap_scan_bus); /* * Tasklet & timer for AP request polling and interrupts */ static void ap_tasklet_fn(unsigned long); static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); static struct task_struct *ap_poll_kthread = NULL; static DEFINE_MUTEX(ap_poll_thread_mutex); static DEFINE_SPINLOCK(ap_poll_timer_lock); static struct hrtimer ap_poll_timer; /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ static unsigned long long poll_timeout = 250000; /* Suspend flag */ static int ap_suspend_flag; /* Maximum domain id */ static int ap_max_domain_id; /* Flag to check if domain was set through module parameter domain=. This is * important when supsend and resume is done in a z/VM environment where the * domain might change. */ static int user_set_domain = 0; static struct bus_type ap_bus_type; /* Adapter interrupt definitions */ static void ap_interrupt_handler(struct airq_struct *airq); static int ap_airq_flag; static struct airq_struct ap_airq = { .handler = ap_interrupt_handler, .isc = AP_ISC, }; /** * ap_using_interrupts() - Returns non-zero if interrupt support is * available. */ static inline int ap_using_interrupts(void) { return ap_airq_flag; } /** * ap_airq_ptr() - Get the address of the adapter interrupt indicator * * Returns the address of the local-summary-indicator of the adapter * interrupt handler for AP, or NULL if adapter interrupts are not * available. */ void *ap_airq_ptr(void) { if (ap_using_interrupts()) return ap_airq.lsi_ptr; return NULL; } /** * ap_interrupts_available(): Test if AP interrupts are available. * * Returns 1 if AP interrupts are available. */ static int ap_interrupts_available(void) { return test_facility(65); } /** * ap_configuration_available(): Test if AP configuration * information is available. * * Returns 1 if AP configuration information is available. */ static int ap_configuration_available(void) { return test_facility(12); } /** * ap_apft_available(): Test if AP facilities test (APFT) * facility is available. * * Returns 1 if APFT is is available. */ static int ap_apft_available(void) { return test_facility(15); } /* * ap_qact_available(): Test if the PQAP(QACT) subfunction is available. * * Returns 1 if the QACT subfunction is available. */ static inline int ap_qact_available(void) { if (ap_configuration) return ap_configuration->qact; return 0; } /* * ap_query_configuration(): Fetch cryptographic config info * * Returns the ap configuration info fetched via PQAP(QCI). * On success 0 is returned, on failure a negative errno * is returned, e.g. if the PQAP(QCI) instruction is not * available, the return value will be -EOPNOTSUPP. */ static inline int ap_query_configuration(struct ap_config_info *info) { if (!ap_configuration_available()) return -EOPNOTSUPP; if (!info) return -EINVAL; return ap_qci(info); } EXPORT_SYMBOL(ap_query_configuration); /** * ap_init_configuration(): Allocate and query configuration array. */ static void ap_init_configuration(void) { if (!ap_configuration_available()) return; ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); if (!ap_configuration) return; if (ap_query_configuration(ap_configuration) != 0) { kfree(ap_configuration); ap_configuration = NULL; return; } } /* * ap_test_config(): helper function to extract the nrth bit * within the unsigned int array field. */ static inline int ap_test_config(unsigned int *field, unsigned int nr) { return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); } /* * ap_test_config_card_id(): Test, whether an AP card ID is configured. * @id AP card ID * * Returns 0 if the card is not configured * 1 if the card is configured or * if the configuration information is not available */ static inline int ap_test_config_card_id(unsigned int id) { if (!ap_configuration) /* QCI not supported */ return 1; return ap_test_config(ap_configuration->apm, id); } /* * ap_test_config_domain(): Test, whether an AP usage domain is configured. * @domain AP usage domain ID * * Returns 0 if the usage domain is not configured * 1 if the usage domain is configured or * if the configuration information is not available */ static inline int ap_test_config_domain(unsigned int domain) { if (!ap_configuration) /* QCI not supported */ return domain < 16; return ap_test_config(ap_configuration->aqm, domain); } /** * ap_query_queue(): Check if an AP queue is available. * @qid: The AP queue number * @queue_depth: Pointer to queue depth value * @device_type: Pointer to device type value * @facilities: Pointer to facility indicator */ static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, unsigned int *facilities) { struct ap_queue_status status; unsigned long info; int nd; if (!ap_test_config_card_id(AP_QID_CARD(qid))) return -ENODEV; status = ap_test_queue(qid, ap_apft_available(), &info); switch (status.response_code) { case AP_RESPONSE_NORMAL: *queue_depth = (int)(info & 0xff); *device_type = (int)((info >> 24) & 0xff); *facilities = (unsigned int)(info >> 32); /* Update maximum domain id */ nd = (info >> 16) & 0xff; /* if N bit is available, z13 and newer */ if ((info & (1UL << 57)) && nd > 0) ap_max_domain_id = nd; else /* older machine types */ ap_max_domain_id = 15; switch (*device_type) { /* For CEX2 and CEX3 the available functions * are not refrected by the facilities bits. * Instead it is coded into the type. So here * modify the function bits based on the type. */ case AP_DEVICE_TYPE_CEX2A: case AP_DEVICE_TYPE_CEX3A: *facilities |= 0x08000000; break; case AP_DEVICE_TYPE_CEX2C: case AP_DEVICE_TYPE_CEX3C: *facilities |= 0x10000000; break; default: break; } return 0; case AP_RESPONSE_Q_NOT_AVAIL: case AP_RESPONSE_DECONFIGURED: case AP_RESPONSE_CHECKSTOPPED: case AP_RESPONSE_INVALID_ADDRESS: return -ENODEV; case AP_RESPONSE_RESET_IN_PROGRESS: case AP_RESPONSE_OTHERWISE_CHANGED: case AP_RESPONSE_BUSY: return -EBUSY; default: BUG(); } } void ap_wait(enum ap_wait wait) { ktime_t hr_time; switch (wait) { case AP_WAIT_AGAIN: case AP_WAIT_INTERRUPT: if (ap_using_interrupts()) break; if (ap_poll_kthread) { wake_up(&ap_poll_wait); break; } /* Fall through */ case AP_WAIT_TIMEOUT: spin_lock_bh(&ap_poll_timer_lock); if (!hrtimer_is_queued(&ap_poll_timer)) { hr_time = poll_timeout; hrtimer_forward_now(&ap_poll_timer, hr_time); hrtimer_restart(&ap_poll_timer); } spin_unlock_bh(&ap_poll_timer_lock); break; case AP_WAIT_NONE: default: break; } } /** * ap_request_timeout(): Handling of request timeouts * @t: timer making this callback * * Handles request timeouts. */ void ap_request_timeout(struct timer_list *t) { struct ap_queue *aq = from_timer(aq, t, timeout); if (ap_suspend_flag) return; spin_lock_bh(&aq->lock); ap_wait(ap_sm_event(aq, AP_EVENT_TIMEOUT)); spin_unlock_bh(&aq->lock); } /** * ap_poll_timeout(): AP receive polling for finished AP requests. * @unused: Unused pointer. * * Schedules the AP tasklet using a high resolution timer. */ static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) { if (!ap_suspend_flag) tasklet_schedule(&ap_tasklet); return HRTIMER_NORESTART; } /** * ap_interrupt_handler() - Schedule ap_tasklet on interrupt * @airq: pointer to adapter interrupt descriptor */ static void ap_interrupt_handler(struct airq_struct *airq) { inc_irq_stat(IRQIO_APB); if (!ap_suspend_flag) tasklet_schedule(&ap_tasklet); } /** * ap_tasklet_fn(): Tasklet to poll all AP devices. * @dummy: Unused variable * * Poll all AP devices on the bus. */ static void ap_tasklet_fn(unsigned long dummy) { struct ap_card *ac; struct ap_queue *aq; enum ap_wait wait = AP_WAIT_NONE; /* Reset the indicator if interrupts are used. Thus new interrupts can * be received. Doing it in the beginning of the tasklet is therefor * important that no requests on any AP get lost. */ if (ap_using_interrupts()) xchg(ap_airq.lsi_ptr, 0); spin_lock_bh(&ap_list_lock); for_each_ap_card(ac) { for_each_ap_queue(aq, ac) { spin_lock_bh(&aq->lock); wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL)); spin_unlock_bh(&aq->lock); } } spin_unlock_bh(&ap_list_lock); ap_wait(wait); } static int ap_pending_requests(void) { struct ap_card *ac; struct ap_queue *aq; spin_lock_bh(&ap_list_lock); for_each_ap_card(ac) { for_each_ap_queue(aq, ac) { if (aq->queue_count == 0) continue; spin_unlock_bh(&ap_list_lock); return 1; } } spin_unlock_bh(&ap_list_lock); return 0; } /** * ap_poll_thread(): Thread that polls for finished requests. * @data: Unused pointer * * AP bus poll thread. The purpose of this thread is to poll for * finished requests in a loop if there is a "free" cpu - that is * a cpu that doesn't have anything better to do. The polling stops * as soon as there is another task or if all messages have been * delivered. */ static int ap_poll_thread(void *data) { DECLARE_WAITQUEUE(wait, current); set_user_nice(current, MAX_NICE); set_freezable(); while (!kthread_should_stop()) { add_wait_queue(&ap_poll_wait, &wait); set_current_state(TASK_INTERRUPTIBLE); if (ap_suspend_flag || !ap_pending_requests()) { schedule(); try_to_freeze(); } set_current_state(TASK_RUNNING); remove_wait_queue(&ap_poll_wait, &wait); if (need_resched()) { schedule(); try_to_freeze(); continue; } ap_tasklet_fn(0); } return 0; } static int ap_poll_thread_start(void) { int rc; if (ap_using_interrupts() || ap_poll_kthread) return 0; mutex_lock(&ap_poll_thread_mutex); ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); rc = PTR_RET(ap_poll_kthread); if (rc) ap_poll_kthread = NULL; mutex_unlock(&ap_poll_thread_mutex); return rc; } static void ap_poll_thread_stop(void) { if (!ap_poll_kthread) return; mutex_lock(&ap_poll_thread_mutex); kthread_stop(ap_poll_kthread); ap_poll_kthread = NULL; mutex_unlock(&ap_poll_thread_mutex); } #define is_card_dev(x) ((x)->parent == ap_root_device) #define is_queue_dev(x) ((x)->parent != ap_root_device) /** * ap_bus_match() * @dev: Pointer to device * @drv: Pointer to device_driver * * AP bus driver registration/unregistration. */ static int ap_bus_match(struct device *dev, struct device_driver *drv) { struct ap_driver *ap_drv = to_ap_drv(drv); struct ap_device_id *id; /* * Compare device type of the device with the list of * supported types of the device_driver. */ for (id = ap_drv->ids; id->match_flags; id++) { if (is_card_dev(dev) && id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE && id->dev_type == to_ap_dev(dev)->device_type) return 1; if (is_queue_dev(dev) && id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE && id->dev_type == to_ap_dev(dev)->device_type) return 1; } return 0; } /** * ap_uevent(): Uevent function for AP devices. * @dev: Pointer to device * @env: Pointer to kobj_uevent_env * * It sets up a single environment variable DEV_TYPE which contains the * hardware device type. */ static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) { struct ap_device *ap_dev = to_ap_dev(dev); int retval = 0; if (!ap_dev) return -ENODEV; /* Set up DEV_TYPE environment variable. */ retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); if (retval) return retval; /* Add MODALIAS= */ retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); return retval; } static int ap_dev_suspend(struct device *dev) { struct ap_device *ap_dev = to_ap_dev(dev); if (ap_dev->drv && ap_dev->drv->suspend) ap_dev->drv->suspend(ap_dev); return 0; } static int ap_dev_resume(struct device *dev) { struct ap_device *ap_dev = to_ap_dev(dev); if (ap_dev->drv && ap_dev->drv->resume) ap_dev->drv->resume(ap_dev); return 0; } static void ap_bus_suspend(void) { AP_DBF(DBF_DEBUG, "ap_bus_suspend running\n"); ap_suspend_flag = 1; /* * Disable scanning for devices, thus we do not want to scan * for them after removing. */ flush_work(&ap_scan_work); tasklet_disable(&ap_tasklet); } static int __ap_card_devices_unregister(struct device *dev, void *dummy) { if (is_card_dev(dev)) device_unregister(dev); return 0; } static int __ap_queue_devices_unregister(struct device *dev, void *dummy) { if (is_queue_dev(dev)) device_unregister(dev); return 0; } static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data) { if (is_queue_dev(dev) && AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data) device_unregister(dev); return 0; } static void ap_bus_resume(void) { int rc; AP_DBF(DBF_DEBUG, "ap_bus_resume running\n"); /* remove all queue devices */ bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_queue_devices_unregister); /* remove all card devices */ bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_card_devices_unregister); /* Reset thin interrupt setting */ if (ap_interrupts_available() && !ap_using_interrupts()) { rc = register_adapter_interrupt(&ap_airq); ap_airq_flag = (rc == 0); } if (!ap_interrupts_available() && ap_using_interrupts()) { unregister_adapter_interrupt(&ap_airq); ap_airq_flag = 0; } /* Reset domain */ if (!user_set_domain) ap_domain_index = -1; /* Get things going again */ ap_suspend_flag = 0; if (ap_airq_flag) xchg(ap_airq.lsi_ptr, 0); tasklet_enable(&ap_tasklet); queue_work(system_long_wq, &ap_scan_work); } static int ap_power_event(struct notifier_block *this, unsigned long event, void *ptr) { switch (event) { case PM_HIBERNATION_PREPARE: case PM_SUSPEND_PREPARE: ap_bus_suspend(); break; case PM_POST_HIBERNATION: case PM_POST_SUSPEND: ap_bus_resume(); break; default: break; } return NOTIFY_DONE; } static struct notifier_block ap_power_notifier = { .notifier_call = ap_power_event, }; static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, ap_dev_resume); static struct bus_type ap_bus_type = { .name = "ap", .match = &ap_bus_match, .uevent = &ap_uevent, .pm = &ap_bus_pm_ops, }; static int ap_device_probe(struct device *dev) { struct ap_device *ap_dev = to_ap_dev(dev); struct ap_driver *ap_drv = to_ap_drv(dev->driver); int rc; /* Add queue/card to list of active queues/cards */ spin_lock_bh(&ap_list_lock); if (is_card_dev(dev)) list_add(&to_ap_card(dev)->list, &ap_card_list); else list_add(&to_ap_queue(dev)->list, &to_ap_queue(dev)->card->queues); spin_unlock_bh(&ap_list_lock); ap_dev->drv = ap_drv; rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; if (rc) { spin_lock_bh(&ap_list_lock); if (is_card_dev(dev)) list_del_init(&to_ap_card(dev)->list); else list_del_init(&to_ap_queue(dev)->list); spin_unlock_bh(&ap_list_lock); ap_dev->drv = NULL; } return rc; } static int ap_device_remove(struct device *dev) { struct ap_device *ap_dev = to_ap_dev(dev); struct ap_driver *ap_drv = ap_dev->drv; if (ap_drv->remove) ap_drv->remove(ap_dev); /* Remove queue/card from list of active queues/cards */ spin_lock_bh(&ap_list_lock); if (is_card_dev(dev)) list_del_init(&to_ap_card(dev)->list); else list_del_init(&to_ap_queue(dev)->list); spin_unlock_bh(&ap_list_lock); return 0; } int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, char *name) { struct device_driver *drv = &ap_drv->driver; if (!initialised) return -ENODEV; drv->bus = &ap_bus_type; drv->probe = ap_device_probe; drv->remove = ap_device_remove; drv->owner = owner; drv->name = name; return driver_register(drv); } EXPORT_SYMBOL(ap_driver_register); void ap_driver_unregister(struct ap_driver *ap_drv) { driver_unregister(&ap_drv->driver); } EXPORT_SYMBOL(ap_driver_unregister); void ap_bus_force_rescan(void) { if (ap_suspend_flag) return; /* processing a asynchronous bus rescan */ del_timer(&ap_config_timer); queue_work(system_long_wq, &ap_scan_work); flush_work(&ap_scan_work); } EXPORT_SYMBOL(ap_bus_force_rescan); /* * AP bus attributes. */ static ssize_t ap_domain_show(struct bus_type *bus, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); } static ssize_t ap_domain_store(struct bus_type *bus, const char *buf, size_t count) { int domain; if (sscanf(buf, "%i\n", &domain) != 1 || domain < 0 || domain > ap_max_domain_id) return -EINVAL; spin_lock_bh(&ap_domain_lock); ap_domain_index = domain; spin_unlock_bh(&ap_domain_lock); AP_DBF(DBF_DEBUG, "stored new default domain=%d\n", domain); return count; } static BUS_ATTR(ap_domain, 0644, ap_domain_show, ap_domain_store); static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) { if (!ap_configuration) /* QCI not supported */ return snprintf(buf, PAGE_SIZE, "not supported\n"); return snprintf(buf, PAGE_SIZE, "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", ap_configuration->adm[0], ap_configuration->adm[1], ap_configuration->adm[2], ap_configuration->adm[3], ap_configuration->adm[4], ap_configuration->adm[5], ap_configuration->adm[6], ap_configuration->adm[7]); } static BUS_ATTR(ap_control_domain_mask, 0444, ap_control_domain_mask_show, NULL); static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf) { if (!ap_configuration) /* QCI not supported */ return snprintf(buf, PAGE_SIZE, "not supported\n"); return snprintf(buf, PAGE_SIZE, "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", ap_configuration->aqm[0], ap_configuration->aqm[1], ap_configuration->aqm[2], ap_configuration->aqm[3], ap_configuration->aqm[4], ap_configuration->aqm[5], ap_configuration->aqm[6], ap_configuration->aqm[7]); } static BUS_ATTR(ap_usage_domain_mask, 0444, ap_usage_domain_mask_show, NULL); static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); } static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", ap_using_interrupts() ? 1 : 0); } static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); static ssize_t ap_config_time_store(struct bus_type *bus, const char *buf, size_t count) { int time; if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) return -EINVAL; ap_config_time = time; mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); return count; } static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); } static ssize_t ap_poll_thread_store(struct bus_type *bus, const char *buf, size_t count) { int flag, rc; if (sscanf(buf, "%d\n", &flag) != 1) return -EINVAL; if (flag) { rc = ap_poll_thread_start(); if (rc) count = rc; } else ap_poll_thread_stop(); return count; } static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) { return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); } static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, size_t count) { unsigned long long time; ktime_t hr_time; /* 120 seconds = maximum poll interval */ if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || time > 120000000000ULL) return -EINVAL; poll_timeout = time; hr_time = poll_timeout; spin_lock_bh(&ap_poll_timer_lock); hrtimer_cancel(&ap_poll_timer); hrtimer_set_expires(&ap_poll_timer, hr_time); hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); spin_unlock_bh(&ap_poll_timer_lock); return count; } static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) { int max_domain_id; if (ap_configuration) max_domain_id = ap_max_domain_id ? : -1; else max_domain_id = 15; return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); } static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL); static struct bus_attribute *const ap_bus_attrs[] = { &bus_attr_ap_domain, &bus_attr_ap_control_domain_mask, &bus_attr_ap_usage_domain_mask, &bus_attr_config_time, &bus_attr_poll_thread, &bus_attr_ap_interrupts, &bus_attr_poll_timeout, &bus_attr_ap_max_domain_id, NULL, }; /** * ap_select_domain(): Select an AP domain. * * Pick one of the 16 AP domains. */ static int ap_select_domain(void) { int count, max_count, best_domain; struct ap_queue_status status; int i, j; /* * We want to use a single domain. Either the one specified with * the "domain=" parameter or the domain with the maximum number * of devices. */ spin_lock_bh(&ap_domain_lock); if (ap_domain_index >= 0) { /* Domain has already been selected. */ spin_unlock_bh(&ap_domain_lock); return 0; } best_domain = -1; max_count = 0; for (i = 0; i < AP_DOMAINS; i++) { if (!ap_test_config_domain(i)) continue; count = 0; for (j = 0; j < AP_DEVICES; j++) { if (!ap_test_config_card_id(j)) continue; status = ap_test_queue(AP_MKQID(j, i), ap_apft_available(), NULL); if (status.response_code != AP_RESPONSE_NORMAL) continue; count++; } if (count > max_count) { max_count = count; best_domain = i; } } if (best_domain >= 0){ ap_domain_index = best_domain; AP_DBF(DBF_DEBUG, "new ap_domain_index=%d\n", ap_domain_index); spin_unlock_bh(&ap_domain_lock); return 0; } spin_unlock_bh(&ap_domain_lock); return -ENODEV; } /* * This function checks the type and returns either 0 for not * supported or the highest compatible type value (which may * include the input type value). */ static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func) { int comp_type = 0; /* < CEX2A is not supported */ if (rawtype < AP_DEVICE_TYPE_CEX2A) return 0; /* up to CEX6 known and fully supported */ if (rawtype <= AP_DEVICE_TYPE_CEX6) return rawtype; /* * unknown new type > CEX6, check for compatibility * to the highest known and supported type which is * currently CEX6 with the help of the QACT function. */ if (ap_qact_available()) { struct ap_queue_status status; union ap_qact_ap_info apinfo = {0}; apinfo.mode = (func >> 26) & 0x07; apinfo.cat = AP_DEVICE_TYPE_CEX6; status = ap_qact(qid, 0, &apinfo); if (status.response_code == AP_RESPONSE_NORMAL && apinfo.cat >= AP_DEVICE_TYPE_CEX2A && apinfo.cat <= AP_DEVICE_TYPE_CEX6) comp_type = apinfo.cat; } if (!comp_type) AP_DBF(DBF_WARN, "queue=%02x.%04x unable to map type %d\n", AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype); else if (comp_type != rawtype) AP_DBF(DBF_INFO, "queue=%02x.%04x map type %d to %d\n", AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype, comp_type); return comp_type; } /* * helper function to be used with bus_find_dev * matches for the card device with the given id */ static int __match_card_device_with_id(struct device *dev, void *data) { return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long) data; } /* helper function to be used with bus_find_dev * matches for the queue device with a given qid */ static int __match_queue_device_with_qid(struct device *dev, void *data) { return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data; } /** * ap_scan_bus(): Scan the AP bus for new devices * Runs periodically, workqueue timer (ap_config_time) */ static void ap_scan_bus(struct work_struct *unused) { struct ap_queue *aq; struct ap_card *ac; struct device *dev; ap_qid_t qid; int comp_type, depth = 0, type = 0; unsigned int func = 0; int rc, id, dom, borked, domains, defdomdevs = 0; AP_DBF(DBF_DEBUG, "ap_scan_bus running\n"); ap_query_configuration(ap_configuration); if (ap_select_domain() != 0) goto out; for (id = 0; id < AP_DEVICES; id++) { /* check if device is registered */ dev = bus_find_device(&ap_bus_type, NULL, (void *)(long) id, __match_card_device_with_id); ac = dev ? to_ap_card(dev) : NULL; if (!ap_test_config_card_id(id)) { if (dev) { /* Card device has been removed from * configuration, remove the belonging * queue devices. */ bus_for_each_dev(&ap_bus_type, NULL, (void *)(long) id, __ap_queue_devices_with_id_unregister); /* now remove the card device */ device_unregister(dev); put_device(dev); } continue; } /* According to the configuration there should be a card * device, so check if there is at least one valid queue * and maybe create queue devices and the card device. */ domains = 0; for (dom = 0; dom < AP_DOMAINS; dom++) { qid = AP_MKQID(id, dom); dev = bus_find_device(&ap_bus_type, NULL, (void *)(long) qid, __match_queue_device_with_qid); aq = dev ? to_ap_queue(dev) : NULL; if (!ap_test_config_domain(dom)) { if (dev) { /* Queue device exists but has been * removed from configuration. */ device_unregister(dev); put_device(dev); } continue; } rc = ap_query_queue(qid, &depth, &type, &func); if (dev) { spin_lock_bh(&aq->lock); if (rc == -ENODEV || /* adapter reconfiguration */ (ac && ac->functions != func)) aq->state = AP_STATE_BORKED; borked = aq->state == AP_STATE_BORKED; spin_unlock_bh(&aq->lock); if (borked) /* Remove broken device */ device_unregister(dev); put_device(dev); if (!borked) { domains++; if (dom == ap_domain_index) defdomdevs++; continue; } } if (rc) continue; /* a new queue device is needed, check out comp type */ comp_type = ap_get_compatible_type(qid, type, func); if (!comp_type) continue; /* maybe a card device needs to be created first */ if (!ac) { ac = ap_card_create(id, depth, type, comp_type, func); if (!ac) continue; ac->ap_dev.device.bus = &ap_bus_type; ac->ap_dev.device.parent = ap_root_device; dev_set_name(&ac->ap_dev.device, "card%02x", id); /* Register card with AP bus */ rc = device_register(&ac->ap_dev.device); if (rc) { put_device(&ac->ap_dev.device); ac = NULL; break; } /* get it and thus adjust reference counter */ get_device(&ac->ap_dev.device); } /* now create the new queue device */ aq = ap_queue_create(qid, comp_type); if (!aq) continue; aq->card = ac; aq->ap_dev.device.bus = &ap_bus_type; aq->ap_dev.device.parent = &ac->ap_dev.device; dev_set_name(&aq->ap_dev.device, "%02x.%04x", id, dom); /* Start with a device reset */ spin_lock_bh(&aq->lock); ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); spin_unlock_bh(&aq->lock); /* Register device */ rc = device_register(&aq->ap_dev.device); if (rc) { put_device(&aq->ap_dev.device); continue; } domains++; if (dom == ap_domain_index) defdomdevs++; } /* end domain loop */ if (ac) { /* remove card dev if there are no queue devices */ if (!domains) device_unregister(&ac->ap_dev.device); put_device(&ac->ap_dev.device); } } /* end device loop */ if (defdomdevs < 1) AP_DBF(DBF_INFO, "no queue device with default domain %d available\n", ap_domain_index); out: mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); } static void ap_config_timeout(struct timer_list *unused) { if (ap_suspend_flag) return; queue_work(system_long_wq, &ap_scan_work); } static int __init ap_debug_init(void) { ap_dbf_info = debug_register("ap", 1, 1, DBF_MAX_SPRINTF_ARGS * sizeof(long)); debug_register_view(ap_dbf_info, &debug_sprintf_view); debug_set_level(ap_dbf_info, DBF_ERR); return 0; } /** * ap_module_init(): The module initialization code. * * Initializes the module. */ static int __init ap_module_init(void) { int max_domain_id; int rc, i; rc = ap_debug_init(); if (rc) return rc; if (ap_instructions_available() != 0) { pr_warn("The hardware system does not support AP instructions\n"); return -ENODEV; } /* Get AP configuration data if available */ ap_init_configuration(); if (ap_configuration) max_domain_id = ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1; else max_domain_id = 15; if (ap_domain_index < -1 || ap_domain_index > max_domain_id) { pr_warn("%d is not a valid cryptographic domain\n", ap_domain_index); ap_domain_index = -1; } /* In resume callback we need to know if the user had set the domain. * If so, we can not just reset it. */ if (ap_domain_index >= 0) user_set_domain = 1; if (ap_interrupts_available()) { rc = register_adapter_interrupt(&ap_airq); ap_airq_flag = (rc == 0); } /* Create /sys/bus/ap. */ rc = bus_register(&ap_bus_type); if (rc) goto out; for (i = 0; ap_bus_attrs[i]; i++) { rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); if (rc) goto out_bus; } /* Create /sys/devices/ap. */ ap_root_device = root_device_register("ap"); rc = PTR_RET(ap_root_device); if (rc) goto out_bus; /* Setup the AP bus rescan timer. */ timer_setup(&ap_config_timer, ap_config_timeout, 0); /* * Setup the high resultion poll timer. * If we are running under z/VM adjust polling to z/VM polling rate. */ if (MACHINE_IS_VM) poll_timeout = 1500000; spin_lock_init(&ap_poll_timer_lock); hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); ap_poll_timer.function = ap_poll_timeout; /* Start the low priority AP bus poll thread. */ if (ap_thread_flag) { rc = ap_poll_thread_start(); if (rc) goto out_work; } rc = register_pm_notifier(&ap_power_notifier); if (rc) goto out_pm; queue_work(system_long_wq, &ap_scan_work); initialised = true; return 0; out_pm: ap_poll_thread_stop(); out_work: hrtimer_cancel(&ap_poll_timer); root_device_unregister(ap_root_device); out_bus: while (i--) bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); bus_unregister(&ap_bus_type); out: if (ap_using_interrupts()) unregister_adapter_interrupt(&ap_airq); kfree(ap_configuration); return rc; } device_initcall(ap_module_init);