| /* |
| * Copyright IBM Corp. 2006, 2012 |
| * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
| * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| * Ralph Wuerthner <rwuerthn@de.ibm.com> |
| * Felix Beck <felix.beck@de.ibm.com> |
| * Holger Dengler <hd@linux.vnet.ibm.com> |
| * |
| * Adjunct processor bus. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #define KMSG_COMPONENT "ap" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/kernel_stat.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/interrupt.h> |
| #include <linux/workqueue.h> |
| #include <linux/slab.h> |
| #include <linux/notifier.h> |
| #include <linux/kthread.h> |
| #include <linux/mutex.h> |
| #include <linux/suspend.h> |
| #include <asm/reset.h> |
| #include <asm/airq.h> |
| #include <linux/atomic.h> |
| #include <asm/isc.h> |
| #include <linux/hrtimer.h> |
| #include <linux/ktime.h> |
| #include <asm/facility.h> |
| #include <linux/crypto.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/debugfs.h> |
| |
| #include "ap_bus.h" |
| #include "ap_asm.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_test_queue(): Test adjunct processor queue. |
| * @qid: The AP queue number |
| * @info: Pointer to queue descriptor |
| * |
| * Returns AP queue status structure. |
| */ |
| static inline struct ap_queue_status |
| ap_test_queue(ap_qid_t qid, unsigned long *info) |
| { |
| if (test_facility(15)) |
| qid |= 1UL << 23; /* set APFT T bit*/ |
| return ap_tapq(qid, info); |
| } |
| |
| static inline int ap_query_configuration(void) |
| { |
| if (!ap_configuration) |
| return -EOPNOTSUPP; |
| return ap_qci(ap_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() != 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, &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 |
| * @data: Holds the AP device. |
| * |
| * Handles request timeouts. |
| */ |
| void ap_request_timeout(unsigned long data) |
| { |
| struct ap_queue *aq = (struct ap_queue *) data; |
| |
| 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), 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; |
| } |
| |
| /* |
| * 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 depth = 0, type = 0; |
| unsigned int functions = 0; |
| int rc, id, dom, borked, domains, defdomdevs = 0; |
| |
| AP_DBF(DBF_DEBUG, "ap_scan_bus running\n"); |
| |
| ap_query_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, &functions); |
| if (dev) { |
| spin_lock_bh(&aq->lock); |
| if (rc == -ENODEV || |
| /* adapter reconfiguration */ |
| (ac && ac->functions != functions)) |
| 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; |
| /* new queue device needed */ |
| if (!ac) { |
| /* but first create the card device */ |
| ac = ap_card_create(id, depth, |
| type, functions); |
| 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, 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(unsigned long ptr) |
| { |
| if (ap_suspend_flag) |
| return; |
| queue_work(system_long_wq, &ap_scan_work); |
| } |
| |
| static void ap_reset_all(void) |
| { |
| int i, j; |
| |
| for (i = 0; i < AP_DOMAINS; i++) { |
| if (!ap_test_config_domain(i)) |
| continue; |
| for (j = 0; j < AP_DEVICES; j++) { |
| if (!ap_test_config_card_id(j)) |
| continue; |
| ap_rapq(AP_MKQID(j, i)); |
| } |
| } |
| } |
| |
| static struct reset_call ap_reset_call = { |
| .fn = ap_reset_all, |
| }; |
| |
| 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; |
| } |
| |
| void ap_debug_exit(void) |
| { |
| debug_unregister(ap_dbf_info); |
| } |
| |
| /** |
| * ap_module_init(): The module initialization code. |
| * |
| * Initializes the module. |
| */ |
| 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); |
| } |
| |
| register_reset_call(&ap_reset_call); |
| |
| /* 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. */ |
| setup_timer(&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: |
| unregister_reset_call(&ap_reset_call); |
| if (ap_using_interrupts()) |
| unregister_adapter_interrupt(&ap_airq); |
| kfree(ap_configuration); |
| return rc; |
| } |
| device_initcall(ap_module_init); |