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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * 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.
- */
- #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/freezer.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 <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 <linux/ctype.h>
- #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, 0440);
- MODULE_PARM_DESC(domain, "domain index for ap devices");
- EXPORT_SYMBOL(ap_domain_index);
- static int ap_thread_flag;
- module_param_named(poll_thread, ap_thread_flag, int, 0440);
- MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
- static char *apm_str;
- module_param_named(apmask, apm_str, charp, 0440);
- MODULE_PARM_DESC(apmask, "AP bus adapter mask.");
- static char *aqm_str;
- module_param_named(aqmask, aqm_str, charp, 0440);
- MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
- static struct device *ap_root_device;
- /* Hashtable of all queue devices on the AP bus */
- DEFINE_HASHTABLE(ap_queues, 8);
- /* lock used for the ap_queues hashtable */
- DEFINE_SPINLOCK(ap_queues_lock);
- /* Default permissions (ioctl, card and domain masking) */
- struct ap_perms ap_perms;
- EXPORT_SYMBOL(ap_perms);
- DEFINE_MUTEX(ap_perms_mutex);
- EXPORT_SYMBOL(ap_perms_mutex);
- static struct ap_config_info *ap_qci_info;
- /*
- * 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_OLD(ap_tasklet, ap_tasklet_fn);
- static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
- static struct task_struct *ap_poll_kthread;
- 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;
- /* Maximum domain id, if not given via qci */
- static int ap_max_domain_id = 15;
- /* Maximum adapter id, if not given via qci */
- static int ap_max_adapter_id = 63;
- static struct bus_type ap_bus_type;
- /* Adapter interrupt definitions */
- static void ap_interrupt_handler(struct airq_struct *airq, bool floating);
- static bool ap_irq_flag;
- static struct airq_struct ap_airq = {
- .handler = ap_interrupt_handler,
- .isc = AP_ISC,
- };
- /**
- * 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_irq_flag)
- 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_qci_available(): Test if AP configuration
- * information can be queried via QCI subfunction.
- *
- * Returns 1 if subfunction PQAP(QCI) is available.
- */
- static int ap_qci_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_qci_info)
- return ap_qci_info->qact;
- return 0;
- }
- /*
- * ap_fetch_qci_info(): 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_fetch_qci_info(struct ap_config_info *info)
- {
- if (!ap_qci_available())
- return -EOPNOTSUPP;
- if (!info)
- return -EINVAL;
- return ap_qci(info);
- }
- /**
- * ap_init_qci_info(): Allocate and query qci config info.
- * Does also update the static variables ap_max_domain_id
- * and ap_max_adapter_id if this info is available.
- */
- static void __init ap_init_qci_info(void)
- {
- if (!ap_qci_available()) {
- AP_DBF_INFO("%s QCI not supported\n", __func__);
- return;
- }
- ap_qci_info = kzalloc(sizeof(*ap_qci_info), GFP_KERNEL);
- if (!ap_qci_info)
- return;
- if (ap_fetch_qci_info(ap_qci_info) != 0) {
- kfree(ap_qci_info);
- ap_qci_info = NULL;
- return;
- }
- AP_DBF_INFO("%s successful fetched initial qci info\n", __func__);
- if (ap_qci_info->apxa) {
- if (ap_qci_info->Na) {
- ap_max_adapter_id = ap_qci_info->Na;
- AP_DBF_INFO("%s new ap_max_adapter_id is %d\n",
- __func__, ap_max_adapter_id);
- }
- if (ap_qci_info->Nd) {
- ap_max_domain_id = ap_qci_info->Nd;
- AP_DBF_INFO("%s new ap_max_domain_id is %d\n",
- __func__, ap_max_domain_id);
- }
- }
- }
- /*
- * 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.
- *
- * 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 (id > ap_max_adapter_id)
- return 0;
- if (ap_qci_info)
- return ap_test_config(ap_qci_info->apm, id);
- return 1;
- }
- /*
- * ap_test_config_usage_domain(): Test, whether an AP usage domain
- * is configured.
- *
- * Returns 0 if the usage domain is not configured
- * 1 if the usage domain is configured or
- * if the configuration information is not available
- */
- int ap_test_config_usage_domain(unsigned int domain)
- {
- if (domain > ap_max_domain_id)
- return 0;
- if (ap_qci_info)
- return ap_test_config(ap_qci_info->aqm, domain);
- return 1;
- }
- EXPORT_SYMBOL(ap_test_config_usage_domain);
- /*
- * ap_test_config_ctrl_domain(): Test, whether an AP control domain
- * is configured.
- * @domain AP control domain ID
- *
- * Returns 1 if the control domain is configured
- * 0 in all other cases
- */
- int ap_test_config_ctrl_domain(unsigned int domain)
- {
- if (!ap_qci_info || domain > ap_max_domain_id)
- return 0;
- return ap_test_config(ap_qci_info->adm, domain);
- }
- EXPORT_SYMBOL(ap_test_config_ctrl_domain);
- /*
- * ap_queue_info(): Check and get AP queue info.
- * Returns true if TAPQ succeeded and the info is filled or
- * false otherwise.
- */
- static bool ap_queue_info(ap_qid_t qid, int *q_type,
- unsigned int *q_fac, int *q_depth, bool *q_decfg)
- {
- struct ap_queue_status status;
- unsigned long info = 0;
- /* make sure we don't run into a specifiation exception */
- if (AP_QID_CARD(qid) > ap_max_adapter_id ||
- AP_QID_QUEUE(qid) > ap_max_domain_id)
- return false;
- /* call TAPQ on this APQN */
- status = ap_test_queue(qid, ap_apft_available(), &info);
- switch (status.response_code) {
- case AP_RESPONSE_NORMAL:
- case AP_RESPONSE_RESET_IN_PROGRESS:
- case AP_RESPONSE_DECONFIGURED:
- case AP_RESPONSE_CHECKSTOPPED:
- case AP_RESPONSE_BUSY:
- /*
- * According to the architecture in all these cases the
- * info should be filled. All bits 0 is not possible as
- * there is at least one of the mode bits set.
- */
- if (WARN_ON_ONCE(!info))
- return false;
- *q_type = (int)((info >> 24) & 0xff);
- *q_fac = (unsigned int)(info >> 32);
- *q_depth = (int)(info & 0xff);
- *q_decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
- switch (*q_type) {
- /* For CEX2 and CEX3 the available functions
- * are not reflected 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:
- *q_fac |= 0x08000000;
- break;
- case AP_DEVICE_TYPE_CEX2C:
- case AP_DEVICE_TYPE_CEX3C:
- *q_fac |= 0x10000000;
- break;
- default:
- break;
- }
- return true;
- default:
- /*
- * A response code which indicates, there is no info available.
- */
- return false;
- }
- }
- void ap_wait(enum ap_sm_wait wait)
- {
- ktime_t hr_time;
- switch (wait) {
- case AP_SM_WAIT_AGAIN:
- case AP_SM_WAIT_INTERRUPT:
- if (ap_irq_flag)
- break;
- if (ap_poll_kthread) {
- wake_up(&ap_poll_wait);
- break;
- }
- fallthrough;
- case AP_SM_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_SM_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);
- spin_lock_bh(&aq->lock);
- ap_wait(ap_sm_event(aq, AP_SM_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)
- {
- 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, bool floating)
- {
- inc_irq_stat(IRQIO_APB);
- 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)
- {
- int bkt;
- struct ap_queue *aq;
- enum ap_sm_wait wait = AP_SM_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_irq_flag)
- xchg(ap_airq.lsi_ptr, 0);
- spin_lock_bh(&ap_queues_lock);
- hash_for_each(ap_queues, bkt, aq, hnode) {
- spin_lock_bh(&aq->lock);
- wait = min(wait, ap_sm_event_loop(aq, AP_SM_EVENT_POLL));
- spin_unlock_bh(&aq->lock);
- }
- spin_unlock_bh(&ap_queues_lock);
- ap_wait(wait);
- }
- static int ap_pending_requests(void)
- {
- int bkt;
- struct ap_queue *aq;
- spin_lock_bh(&ap_queues_lock);
- hash_for_each(ap_queues, bkt, aq, hnode) {
- if (aq->queue_count == 0)
- continue;
- spin_unlock_bh(&ap_queues_lock);
- return 1;
- }
- spin_unlock_bh(&ap_queues_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_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_irq_flag || ap_poll_kthread)
- return 0;
- mutex_lock(&ap_poll_thread_mutex);
- ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
- rc = PTR_ERR_OR_ZERO(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_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 struct bus_type ap_bus_type = {
- .name = "ap",
- .match = &ap_bus_match,
- .uevent = &ap_uevent,
- };
- static int __ap_revise_reserved(struct device *dev, void *dummy)
- {
- int rc, card, queue, devres, drvres;
- if (is_queue_dev(dev)) {
- card = AP_QID_CARD(to_ap_queue(dev)->qid);
- queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
- mutex_lock(&ap_perms_mutex);
- devres = test_bit_inv(card, ap_perms.apm)
- && test_bit_inv(queue, ap_perms.aqm);
- mutex_unlock(&ap_perms_mutex);
- drvres = to_ap_drv(dev->driver)->flags
- & AP_DRIVER_FLAG_DEFAULT;
- if (!!devres != !!drvres) {
- AP_DBF_DBG("reprobing queue=%02x.%04x\n",
- card, queue);
- rc = device_reprobe(dev);
- }
- }
- return 0;
- }
- static void ap_bus_revise_bindings(void)
- {
- bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
- }
- int ap_owned_by_def_drv(int card, int queue)
- {
- int rc = 0;
- if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
- return -EINVAL;
- mutex_lock(&ap_perms_mutex);
- if (test_bit_inv(card, ap_perms.apm)
- && test_bit_inv(queue, ap_perms.aqm))
- rc = 1;
- mutex_unlock(&ap_perms_mutex);
- return rc;
- }
- EXPORT_SYMBOL(ap_owned_by_def_drv);
- int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
- unsigned long *aqm)
- {
- int card, queue, rc = 0;
- mutex_lock(&ap_perms_mutex);
- for (card = 0; !rc && card < AP_DEVICES; card++)
- if (test_bit_inv(card, apm) &&
- test_bit_inv(card, ap_perms.apm))
- for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
- if (test_bit_inv(queue, aqm) &&
- test_bit_inv(queue, ap_perms.aqm))
- rc = 1;
- mutex_unlock(&ap_perms_mutex);
- return rc;
- }
- EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
- 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 card, queue, devres, drvres, rc = -ENODEV;
- if (!get_device(dev))
- return rc;
- if (is_queue_dev(dev)) {
- /*
- * If the apqn is marked as reserved/used by ap bus and
- * default drivers, only probe with drivers with the default
- * flag set. If it is not marked, only probe with drivers
- * with the default flag not set.
- */
- card = AP_QID_CARD(to_ap_queue(dev)->qid);
- queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
- mutex_lock(&ap_perms_mutex);
- devres = test_bit_inv(card, ap_perms.apm)
- && test_bit_inv(queue, ap_perms.aqm);
- mutex_unlock(&ap_perms_mutex);
- drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
- if (!!devres != !!drvres)
- goto out;
- }
- /* Add queue/card to list of active queues/cards */
- spin_lock_bh(&ap_queues_lock);
- if (is_queue_dev(dev))
- hash_add(ap_queues, &to_ap_queue(dev)->hnode,
- to_ap_queue(dev)->qid);
- spin_unlock_bh(&ap_queues_lock);
- ap_dev->drv = ap_drv;
- rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
- if (rc) {
- spin_lock_bh(&ap_queues_lock);
- if (is_queue_dev(dev))
- hash_del(&to_ap_queue(dev)->hnode);
- spin_unlock_bh(&ap_queues_lock);
- ap_dev->drv = NULL;
- }
- out:
- if (rc)
- put_device(dev);
- 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;
- /* prepare ap queue device removal */
- if (is_queue_dev(dev))
- ap_queue_prepare_remove(to_ap_queue(dev));
- /* driver's chance to clean up gracefully */
- if (ap_drv->remove)
- ap_drv->remove(ap_dev);
- /* now do the ap queue device remove */
- if (is_queue_dev(dev))
- ap_queue_remove(to_ap_queue(dev));
- /* Remove queue/card from list of active queues/cards */
- spin_lock_bh(&ap_queues_lock);
- if (is_queue_dev(dev))
- hash_del(&to_ap_queue(dev)->hnode);
- spin_unlock_bh(&ap_queues_lock);
- put_device(dev);
- return 0;
- }
- struct ap_queue *ap_get_qdev(ap_qid_t qid)
- {
- int bkt;
- struct ap_queue *aq;
- spin_lock_bh(&ap_queues_lock);
- hash_for_each(ap_queues, bkt, aq, hnode) {
- if (aq->qid == qid) {
- get_device(&aq->ap_dev.device);
- spin_unlock_bh(&ap_queues_lock);
- return aq;
- }
- }
- spin_unlock_bh(&ap_queues_lock);
- return NULL;
- }
- EXPORT_SYMBOL(ap_get_qdev);
- int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
- char *name)
- {
- struct device_driver *drv = &ap_drv->driver;
- 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)
- {
- /* 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);
- /*
- * A config change has happened, force an ap bus rescan.
- */
- void ap_bus_cfg_chg(void)
- {
- AP_DBF_DBG("%s config change, forcing bus rescan\n", __func__);
- ap_bus_force_rescan();
- }
- /*
- * hex2bitmap() - parse hex mask string and set bitmap.
- * Valid strings are "0x012345678" with at least one valid hex number.
- * Rest of the bitmap to the right is padded with 0. No spaces allowed
- * within the string, the leading 0x may be omitted.
- * Returns the bitmask with exactly the bits set as given by the hex
- * string (both in big endian order).
- */
- static int hex2bitmap(const char *str, unsigned long *bitmap, int bits)
- {
- int i, n, b;
- /* bits needs to be a multiple of 8 */
- if (bits & 0x07)
- return -EINVAL;
- if (str[0] == '0' && str[1] == 'x')
- str++;
- if (*str == 'x')
- str++;
- for (i = 0; isxdigit(*str) && i < bits; str++) {
- b = hex_to_bin(*str);
- for (n = 0; n < 4; n++)
- if (b & (0x08 >> n))
- set_bit_inv(i + n, bitmap);
- i += 4;
- }
- if (*str == '\n')
- str++;
- if (*str)
- return -EINVAL;
- return 0;
- }
- /*
- * modify_bitmap() - parse bitmask argument and modify an existing
- * bit mask accordingly. A concatenation (done with ',') of these
- * terms is recognized:
- * +<bitnr>[-<bitnr>] or -<bitnr>[-<bitnr>]
- * <bitnr> may be any valid number (hex, decimal or octal) in the range
- * 0...bits-1; the leading + or - is required. Here are some examples:
- * +0-15,+32,-128,-0xFF
- * -0-255,+1-16,+0x128
- * +1,+2,+3,+4,-5,-7-10
- * Returns the new bitmap after all changes have been applied. Every
- * positive value in the string will set a bit and every negative value
- * in the string will clear a bit. As a bit may be touched more than once,
- * the last 'operation' wins:
- * +0-255,-128 = first bits 0-255 will be set, then bit 128 will be
- * cleared again. All other bits are unmodified.
- */
- static int modify_bitmap(const char *str, unsigned long *bitmap, int bits)
- {
- int a, i, z;
- char *np, sign;
- /* bits needs to be a multiple of 8 */
- if (bits & 0x07)
- return -EINVAL;
- while (*str) {
- sign = *str++;
- if (sign != '+' && sign != '-')
- return -EINVAL;
- a = z = simple_strtoul(str, &np, 0);
- if (str == np || a >= bits)
- return -EINVAL;
- str = np;
- if (*str == '-') {
- z = simple_strtoul(++str, &np, 0);
- if (str == np || a > z || z >= bits)
- return -EINVAL;
- str = np;
- }
- for (i = a; i <= z; i++)
- if (sign == '+')
- set_bit_inv(i, bitmap);
- else
- clear_bit_inv(i, bitmap);
- while (*str == ',' || *str == '\n')
- str++;
- }
- return 0;
- }
- int ap_parse_mask_str(const char *str,
- unsigned long *bitmap, int bits,
- struct mutex *lock)
- {
- unsigned long *newmap, size;
- int rc;
- /* bits needs to be a multiple of 8 */
- if (bits & 0x07)
- return -EINVAL;
- size = BITS_TO_LONGS(bits)*sizeof(unsigned long);
- newmap = kmalloc(size, GFP_KERNEL);
- if (!newmap)
- return -ENOMEM;
- if (mutex_lock_interruptible(lock)) {
- kfree(newmap);
- return -ERESTARTSYS;
- }
- if (*str == '+' || *str == '-') {
- memcpy(newmap, bitmap, size);
- rc = modify_bitmap(str, newmap, bits);
- } else {
- memset(newmap, 0, size);
- rc = hex2bitmap(str, newmap, bits);
- }
- if (rc == 0)
- memcpy(bitmap, newmap, size);
- mutex_unlock(lock);
- kfree(newmap);
- return rc;
- }
- EXPORT_SYMBOL(ap_parse_mask_str);
- /*
- * AP bus attributes.
- */
- static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(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 ||
- !test_bit_inv(domain, ap_perms.aqm))
- return -EINVAL;
- spin_lock_bh(&ap_domain_lock);
- ap_domain_index = domain;
- spin_unlock_bh(&ap_domain_lock);
- AP_DBF_INFO("stored new default domain=%d\n", domain);
- return count;
- }
- static BUS_ATTR_RW(ap_domain);
- static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
- {
- if (!ap_qci_info) /* QCI not supported */
- return scnprintf(buf, PAGE_SIZE, "not supported\n");
- return scnprintf(buf, PAGE_SIZE,
- "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
- ap_qci_info->adm[0], ap_qci_info->adm[1],
- ap_qci_info->adm[2], ap_qci_info->adm[3],
- ap_qci_info->adm[4], ap_qci_info->adm[5],
- ap_qci_info->adm[6], ap_qci_info->adm[7]);
- }
- static BUS_ATTR_RO(ap_control_domain_mask);
- static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
- {
- if (!ap_qci_info) /* QCI not supported */
- return scnprintf(buf, PAGE_SIZE, "not supported\n");
- return scnprintf(buf, PAGE_SIZE,
- "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
- ap_qci_info->aqm[0], ap_qci_info->aqm[1],
- ap_qci_info->aqm[2], ap_qci_info->aqm[3],
- ap_qci_info->aqm[4], ap_qci_info->aqm[5],
- ap_qci_info->aqm[6], ap_qci_info->aqm[7]);
- }
- static BUS_ATTR_RO(ap_usage_domain_mask);
- static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
- {
- if (!ap_qci_info) /* QCI not supported */
- return scnprintf(buf, PAGE_SIZE, "not supported\n");
- return scnprintf(buf, PAGE_SIZE,
- "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
- ap_qci_info->apm[0], ap_qci_info->apm[1],
- ap_qci_info->apm[2], ap_qci_info->apm[3],
- ap_qci_info->apm[4], ap_qci_info->apm[5],
- ap_qci_info->apm[6], ap_qci_info->apm[7]);
- }
- static BUS_ATTR_RO(ap_adapter_mask);
- static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(buf, PAGE_SIZE, "%d\n",
- ap_irq_flag ? 1 : 0);
- }
- static BUS_ATTR_RO(ap_interrupts);
- static ssize_t config_time_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
- }
- static ssize_t 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_RW(config_time);
- static ssize_t poll_thread_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
- }
- static ssize_t 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_RW(poll_thread);
- static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(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_RW(poll_timeout);
- static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_domain_id);
- }
- static BUS_ATTR_RO(ap_max_domain_id);
- static ssize_t ap_max_adapter_id_show(struct bus_type *bus, char *buf)
- {
- return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_adapter_id);
- }
- static BUS_ATTR_RO(ap_max_adapter_id);
- static ssize_t apmask_show(struct bus_type *bus, char *buf)
- {
- int rc;
- if (mutex_lock_interruptible(&ap_perms_mutex))
- return -ERESTARTSYS;
- rc = scnprintf(buf, PAGE_SIZE,
- "0x%016lx%016lx%016lx%016lx\n",
- ap_perms.apm[0], ap_perms.apm[1],
- ap_perms.apm[2], ap_perms.apm[3]);
- mutex_unlock(&ap_perms_mutex);
- return rc;
- }
- static ssize_t apmask_store(struct bus_type *bus, const char *buf,
- size_t count)
- {
- int rc;
- rc = ap_parse_mask_str(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex);
- if (rc)
- return rc;
- ap_bus_revise_bindings();
- return count;
- }
- static BUS_ATTR_RW(apmask);
- static ssize_t aqmask_show(struct bus_type *bus, char *buf)
- {
- int rc;
- if (mutex_lock_interruptible(&ap_perms_mutex))
- return -ERESTARTSYS;
- rc = scnprintf(buf, PAGE_SIZE,
- "0x%016lx%016lx%016lx%016lx\n",
- ap_perms.aqm[0], ap_perms.aqm[1],
- ap_perms.aqm[2], ap_perms.aqm[3]);
- mutex_unlock(&ap_perms_mutex);
- return rc;
- }
- static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
- size_t count)
- {
- int rc;
- rc = ap_parse_mask_str(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex);
- if (rc)
- return rc;
- ap_bus_revise_bindings();
- return count;
- }
- static BUS_ATTR_RW(aqmask);
- 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_ap_adapter_mask,
- &bus_attr_config_time,
- &bus_attr_poll_thread,
- &bus_attr_ap_interrupts,
- &bus_attr_poll_timeout,
- &bus_attr_ap_max_domain_id,
- &bus_attr_ap_max_adapter_id,
- &bus_attr_apmask,
- &bus_attr_aqmask,
- NULL,
- };
- /**
- * ap_select_domain(): Select an AP domain if possible and we haven't
- * already done so before.
- */
- static void ap_select_domain(void)
- {
- struct ap_queue_status status;
- int card, dom;
- /*
- * Choose the default domain. Either the one specified with
- * the "domain=" parameter or the first domain with at least
- * one valid APQN.
- */
- spin_lock_bh(&ap_domain_lock);
- if (ap_domain_index >= 0) {
- /* Domain has already been selected. */
- goto out;
- }
- for (dom = 0; dom <= ap_max_domain_id; dom++) {
- if (!ap_test_config_usage_domain(dom) ||
- !test_bit_inv(dom, ap_perms.aqm))
- continue;
- for (card = 0; card <= ap_max_adapter_id; card++) {
- if (!ap_test_config_card_id(card) ||
- !test_bit_inv(card, ap_perms.apm))
- continue;
- status = ap_test_queue(AP_MKQID(card, dom),
- ap_apft_available(),
- NULL);
- if (status.response_code == AP_RESPONSE_NORMAL)
- break;
- }
- if (card <= ap_max_adapter_id)
- break;
- }
- if (dom <= ap_max_domain_id) {
- ap_domain_index = dom;
- AP_DBF_INFO("%s new default domain is %d\n",
- __func__, ap_domain_index);
- }
- out:
- spin_unlock_bh(&ap_domain_lock);
- }
- /*
- * 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) {
- AP_DBF_WARN("get_comp_type queue=%02x.%04x unsupported type %d\n",
- AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
- return 0;
- }
- /* up to CEX7 known and fully supported */
- if (rawtype <= AP_DEVICE_TYPE_CEX7)
- return rawtype;
- /*
- * unknown new type > CEX7, check for compatibility
- * to the highest known and supported type which is
- * currently CEX7 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_CEX7;
- status = ap_qact(qid, 0, &apinfo);
- if (status.response_code == AP_RESPONSE_NORMAL
- && apinfo.cat >= AP_DEVICE_TYPE_CEX2A
- && apinfo.cat <= AP_DEVICE_TYPE_CEX7)
- comp_type = apinfo.cat;
- }
- if (!comp_type)
- AP_DBF_WARN("get_comp_type 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_INFO("get_comp_type 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, const void *data)
- {
- return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long)(void *) 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, const void *data)
- {
- return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
- }
- /*
- * Helper function to be used with bus_find_dev
- * matches any queue device with given queue id
- */
- static int __match_queue_device_with_queue_id(struct device *dev, const void *data)
- {
- return is_queue_dev(dev)
- && AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long) data;
- }
- /*
- * Helper function for ap_scan_bus().
- * Remove card device and associated queue devices.
- */
- static inline void ap_scan_rm_card_dev_and_queue_devs(struct ap_card *ac)
- {
- bus_for_each_dev(&ap_bus_type, NULL,
- (void *)(long) ac->id,
- __ap_queue_devices_with_id_unregister);
- device_unregister(&ac->ap_dev.device);
- }
- /*
- * Helper function for ap_scan_bus().
- * Does the scan bus job for all the domains within
- * a valid adapter given by an ap_card ptr.
- */
- static inline void ap_scan_domains(struct ap_card *ac)
- {
- bool decfg;
- ap_qid_t qid;
- unsigned int func;
- struct device *dev;
- struct ap_queue *aq;
- int rc, dom, depth, type;
- /*
- * Go through the configuration for the domains and compare them
- * to the existing queue devices. Also take care of the config
- * and error state for the queue devices.
- */
- for (dom = 0; dom <= ap_max_domain_id; dom++) {
- qid = AP_MKQID(ac->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_usage_domain(dom)) {
- if (dev) {
- AP_DBF_INFO("%s(%d,%d) not in config any more, rm queue device\n",
- __func__, ac->id, dom);
- device_unregister(dev);
- put_device(dev);
- }
- continue;
- }
- /* domain is valid, get info from this APQN */
- if (!ap_queue_info(qid, &type, &func, &depth, &decfg)) {
- if (aq) {
- AP_DBF_INFO(
- "%s(%d,%d) ap_queue_info() not successful, rm queue device\n",
- __func__, ac->id, dom);
- device_unregister(dev);
- put_device(dev);
- }
- continue;
- }
- /* if no queue device exists, create a new one */
- if (!aq) {
- aq = ap_queue_create(qid, ac->ap_dev.device_type);
- if (!aq) {
- AP_DBF_WARN("%s(%d,%d) ap_queue_create() failed\n",
- __func__, ac->id, dom);
- continue;
- }
- aq->card = ac;
- aq->config = !decfg;
- dev = &aq->ap_dev.device;
- dev->bus = &ap_bus_type;
- dev->parent = &ac->ap_dev.device;
- dev_set_name(dev, "%02x.%04x", ac->id, dom);
- /* register queue device */
- rc = device_register(dev);
- if (rc) {
- AP_DBF_WARN("%s(%d,%d) device_register() failed\n",
- __func__, ac->id, dom);
- goto put_dev_and_continue;
- }
- /* get it and thus adjust reference counter */
- get_device(dev);
- if (decfg)
- AP_DBF_INFO("%s(%d,%d) new (decfg) queue device created\n",
- __func__, ac->id, dom);
- else
- AP_DBF_INFO("%s(%d,%d) new queue device created\n",
- __func__, ac->id, dom);
- goto put_dev_and_continue;
- }
- /* Check config state on the already existing queue device */
- spin_lock_bh(&aq->lock);
- if (decfg && aq->config) {
- /* config off this queue device */
- aq->config = false;
- if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
- aq->dev_state = AP_DEV_STATE_ERROR;
- aq->last_err_rc = AP_RESPONSE_DECONFIGURED;
- }
- spin_unlock_bh(&aq->lock);
- AP_DBF_INFO("%s(%d,%d) queue device config off\n",
- __func__, ac->id, dom);
- /* 'receive' pending messages with -EAGAIN */
- ap_flush_queue(aq);
- goto put_dev_and_continue;
- }
- if (!decfg && !aq->config) {
- /* config on this queue device */
- aq->config = true;
- if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
- aq->dev_state = AP_DEV_STATE_OPERATING;
- aq->sm_state = AP_SM_STATE_RESET_START;
- }
- spin_unlock_bh(&aq->lock);
- AP_DBF_INFO("%s(%d,%d) queue device config on\n",
- __func__, ac->id, dom);
- goto put_dev_and_continue;
- }
- /* handle other error states */
- if (!decfg && aq->dev_state == AP_DEV_STATE_ERROR) {
- spin_unlock_bh(&aq->lock);
- /* 'receive' pending messages with -EAGAIN */
- ap_flush_queue(aq);
- /* re-init (with reset) the queue device */
- ap_queue_init_state(aq);
- AP_DBF_INFO("%s(%d,%d) queue device reinit enforced\n",
- __func__, ac->id, dom);
- goto put_dev_and_continue;
- }
- spin_unlock_bh(&aq->lock);
- put_dev_and_continue:
- put_device(dev);
- }
- }
- /*
- * Helper function for ap_scan_bus().
- * Does the scan bus job for the given adapter id.
- */
- static inline void ap_scan_adapter(int ap)
- {
- bool decfg;
- ap_qid_t qid;
- unsigned int func;
- struct device *dev;
- struct ap_card *ac;
- int rc, dom, depth, type, comp_type;
- /* Is there currently a card device for this adapter ? */
- dev = bus_find_device(&ap_bus_type, NULL,
- (void *)(long) ap,
- __match_card_device_with_id);
- ac = dev ? to_ap_card(dev) : NULL;
- /* Adapter not in configuration ? */
- if (!ap_test_config_card_id(ap)) {
- if (ac) {
- AP_DBF_INFO("%s(%d) ap not in config any more, rm card and queue devices\n",
- __func__, ap);
- ap_scan_rm_card_dev_and_queue_devs(ac);
- put_device(dev);
- }
- return;
- }
- /*
- * Adapter ap is valid in the current configuration. So do some checks:
- * If no card device exists, build one. If a card device exists, check
- * for type and functions changed. For all this we need to find a valid
- * APQN first.
- */
- for (dom = 0; dom <= ap_max_domain_id; dom++)
- if (ap_test_config_usage_domain(dom)) {
- qid = AP_MKQID(ap, dom);
- if (ap_queue_info(qid, &type, &func, &depth, &decfg))
- break;
- }
- if (dom > ap_max_domain_id) {
- /* Could not find a valid APQN for this adapter */
- if (ac) {
- AP_DBF_INFO(
- "%s(%d) no type info (no APQN found), rm card and queue devices\n",
- __func__, ap);
- ap_scan_rm_card_dev_and_queue_devs(ac);
- put_device(dev);
- } else {
- AP_DBF_DBG("%s(%d) no type info (no APQN found), ignored\n",
- __func__, ap);
- }
- return;
- }
- if (!type) {
- /* No apdater type info available, an unusable adapter */
- if (ac) {
- AP_DBF_INFO("%s(%d) no valid type (0) info, rm card and queue devices\n",
- __func__, ap);
- ap_scan_rm_card_dev_and_queue_devs(ac);
- put_device(dev);
- } else {
- AP_DBF_DBG("%s(%d) no valid type (0) info, ignored\n",
- __func__, ap);
- }
- return;
- }
- if (ac) {
- /* Check APQN against existing card device for changes */
- if (ac->raw_hwtype != type) {
- AP_DBF_INFO("%s(%d) hwtype %d changed, rm card and queue devices\n",
- __func__, ap, type);
- ap_scan_rm_card_dev_and_queue_devs(ac);
- put_device(dev);
- ac = NULL;
- } else if (ac->functions != func) {
- AP_DBF_INFO("%s(%d) functions 0x%08x changed, rm card and queue devices\n",
- __func__, ap, type);
- ap_scan_rm_card_dev_and_queue_devs(ac);
- put_device(dev);
- ac = NULL;
- } else {
- if (decfg && ac->config) {
- ac->config = false;
- AP_DBF_INFO("%s(%d) card device config off\n",
- __func__, ap);
- }
- if (!decfg && !ac->config) {
- ac->config = true;
- AP_DBF_INFO("%s(%d) card device config on\n",
- __func__, ap);
- }
- }
- }
- if (!ac) {
- /* Build a new card device */
- comp_type = ap_get_compatible_type(qid, type, func);
- if (!comp_type) {
- AP_DBF_WARN("%s(%d) type %d, can't get compatibility type\n",
- __func__, ap, type);
- return;
- }
- ac = ap_card_create(ap, depth, type, comp_type, func);
- if (!ac) {
- AP_DBF_WARN("%s(%d) ap_card_create() failed\n",
- __func__, ap);
- return;
- }
- ac->config = !decfg;
- dev = &ac->ap_dev.device;
- dev->bus = &ap_bus_type;
- dev->parent = ap_root_device;
- dev_set_name(dev, "card%02x", ap);
- /* Register the new card device with AP bus */
- rc = device_register(dev);
- if (rc) {
- AP_DBF_WARN("%s(%d) device_register() failed\n",
- __func__, ap);
- put_device(dev);
- return;
- }
- /* get it and thus adjust reference counter */
- get_device(dev);
- if (decfg)
- AP_DBF_INFO("%s(%d) new (decfg) card device type=%d func=0x%08x created\n",
- __func__, ap, type, func);
- else
- AP_DBF_INFO("%s(%d) new card device type=%d func=0x%08x created\n",
- __func__, ap, type, func);
- }
- /* Verify the domains and the queue devices for this card */
- ap_scan_domains(ac);
- /* release the card device */
- put_device(&ac->ap_dev.device);
- }
- /**
- * 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)
- {
- int ap;
- ap_fetch_qci_info(ap_qci_info);
- ap_select_domain();
- AP_DBF_DBG("%s running\n", __func__);
- /* loop over all possible adapters */
- for (ap = 0; ap <= ap_max_adapter_id; ap++)
- ap_scan_adapter(ap);
- /* check if there is at least one queue available with default domain */
- if (ap_domain_index >= 0) {
- struct device *dev =
- bus_find_device(&ap_bus_type, NULL,
- (void *)(long) ap_domain_index,
- __match_queue_device_with_queue_id);
- if (dev)
- put_device(dev);
- else
- AP_DBF_INFO("no queue device with default domain %d available\n",
- ap_domain_index);
- }
- mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
- }
- static void ap_config_timeout(struct timer_list *unused)
- {
- 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;
- }
- static void __init ap_perms_init(void)
- {
- /* all resources useable if no kernel parameter string given */
- memset(&ap_perms.ioctlm, 0xFF, sizeof(ap_perms.ioctlm));
- memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm));
- memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm));
- /* apm kernel parameter string */
- if (apm_str) {
- memset(&ap_perms.apm, 0, sizeof(ap_perms.apm));
- ap_parse_mask_str(apm_str, ap_perms.apm, AP_DEVICES,
- &ap_perms_mutex);
- }
- /* aqm kernel parameter string */
- if (aqm_str) {
- memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm));
- ap_parse_mask_str(aqm_str, ap_perms.aqm, AP_DOMAINS,
- &ap_perms_mutex);
- }
- }
- /**
- * ap_module_init(): The module initialization code.
- *
- * Initializes the module.
- */
- static int __init ap_module_init(void)
- {
- int rc, i;
- rc = ap_debug_init();
- if (rc)
- return rc;
- if (!ap_instructions_available()) {
- pr_warn("The hardware system does not support AP instructions\n");
- return -ENODEV;
- }
- /* init ap_queue hashtable */
- hash_init(ap_queues);
- /* set up the AP permissions (ioctls, ap and aq masks) */
- ap_perms_init();
- /* Get AP configuration data if available */
- ap_init_qci_info();
- /* check default domain setting */
- if (ap_domain_index < -1 || ap_domain_index > ap_max_domain_id ||
- (ap_domain_index >= 0 &&
- !test_bit_inv(ap_domain_index, ap_perms.aqm))) {
- pr_warn("%d is not a valid cryptographic domain\n",
- ap_domain_index);
- ap_domain_index = -1;
- }
- /* enable interrupts if available */
- if (ap_interrupts_available()) {
- rc = register_adapter_interrupt(&ap_airq);
- ap_irq_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_ERR_OR_ZERO(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;
- 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;
- }
- queue_work(system_long_wq, &ap_scan_work);
- return 0;
- 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_irq_flag)
- unregister_adapter_interrupt(&ap_airq);
- kfree(ap_qci_info);
- return rc;
- }
- device_initcall(ap_module_init);
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