| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Harald Freudenberger | 5811 | 59.89% | 65 | 41.94% |
| Martin Schwidefsky | 1563 | 16.11% | 14 | 9.03% |
| Tony Krowiak | 787 | 8.11% | 6 | 3.87% |
| Ingo Tuchscherer | 757 | 7.80% | 7 | 4.52% |
| Holger Dengler | 364 | 3.75% | 13 | 8.39% |
| Felix Beck | 175 | 1.80% | 9 | 5.81% |
| Ralph Wuerthner | 67 | 0.69% | 6 | 3.87% |
| Julian Wiedmann | 56 | 0.58% | 3 | 1.94% |
| Greg Kroah-Hartman | 26 | 0.27% | 4 | 2.58% |
| Kees Cook | 19 | 0.20% | 2 | 1.29% |
| Matthew Rosato | 12 | 0.12% | 1 | 0.65% |
| Heiko Carstens | 9 | 0.09% | 3 | 1.94% |
| Suzuki K. Poulose | 7 | 0.07% | 1 | 0.65% |
| Jason J. Herne | 7 | 0.07% | 1 | 0.65% |
| Halil Pasic | 5 | 0.05% | 1 | 0.65% |
| Linus Torvalds (pre-git) | 5 | 0.05% | 2 | 1.29% |
| Kay Sievers | 3 | 0.03% | 1 | 0.65% |
| Cornelia Huck | 3 | 0.03% | 1 | 0.65% |
| Mark McLoughlin | 3 | 0.03% | 1 | 0.65% |
| Andreas Westin | 3 | 0.03% | 1 | 0.65% |
| David Howells | 3 | 0.03% | 1 | 0.65% |
| Joe Perches | 2 | 0.02% | 1 | 0.65% |
| Wei Yongjun | 2 | 0.02% | 1 | 0.65% |
| Gustavo A. R. Silva | 2 | 0.02% | 1 | 0.65% |
| Al Viro | 2 | 0.02% | 1 | 0.65% |
| Sebastian Ott | 2 | 0.02% | 1 | 0.65% |
| Ricardo B. Marliere | 2 | 0.02% | 1 | 0.65% |
| Linus Torvalds | 2 | 0.02% | 2 | 1.29% |
| Paul Gortmaker | 1 | 0.01% | 1 | 0.65% |
| Uwe Kleine-König | 1 | 0.01% | 1 | 0.65% |
| Arun Sharma | 1 | 0.01% | 1 | 0.65% |
| Sascha Silbe | 1 | 0.01% | 1 | 0.65% |
| Total | 9703 | 155 |
// SPDX-License-Identifier: GPL-2.0+ /* * Copyright IBM Corp. 2006, 2023 * 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> * Harald Freudenberger <freude@linux.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 <asm/tpi.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 <linux/module.h> #include <asm/uv.h> #include <asm/chsc.h> #include "ap_bus.h" #include "ap_debug.h" MODULE_AUTHOR("IBM Corporation"); MODULE_DESCRIPTION("Adjunct Processor Bus driver"); MODULE_LICENSE("GPL"); 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 int ap_useirq = 1; module_param_named(useirq, ap_useirq, int, 0440); MODULE_PARM_DESC(useirq, "Use interrupt if available, default is 1 (on)."); atomic_t ap_max_msg_size = ATOMIC_INIT(AP_DEFAULT_MAX_MSG_SIZE); EXPORT_SYMBOL(ap_max_msg_size); 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); /* # of bindings complete since init */ static atomic64_t ap_bindings_complete_count = ATOMIC64_INIT(0); /* completion for APQN bindings complete */ static DECLARE_COMPLETION(ap_apqn_bindings_complete); static struct ap_config_info qci[2]; static struct ap_config_info *const ap_qci_info = &qci[0]; static struct ap_config_info *const ap_qci_info_old = &qci[1]; /* * AP bus related debug feature things. */ debug_info_t *ap_dbf_info; /* * AP bus rescan related things. */ static bool ap_scan_bus(void); static bool ap_scan_bus_result; /* result of last ap_scan_bus() */ static DEFINE_MUTEX(ap_scan_bus_mutex); /* mutex ap_scan_bus() invocations */ static atomic64_t ap_scan_bus_count; /* counter ap_scan_bus() invocations */ static int ap_scan_bus_time = AP_CONFIG_TIME; static struct timer_list ap_scan_bus_timer; static void ap_scan_bus_wq_callback(struct work_struct *); static DECLARE_WORK(ap_scan_bus_work, ap_scan_bus_wq_callback); /* * 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 poll_high_timeout = 250000UL; /* * Some state machine states only require a low frequency polling. * We use 25 Hz frequency for these. */ static unsigned long poll_low_timeout = 40000000UL; /* 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 const struct bus_type ap_bus_type; /* Adapter interrupt definitions */ static void ap_interrupt_handler(struct airq_struct *airq, struct tpi_info *tpi_info); 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 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) { return ap_qci_info->qact; } /* * ap_sb_available(): Test if the AP secure binding facility is available. * * Returns 1 if secure binding facility is available. */ int ap_sb_available(void) { return ap_qci_info->apsb; } /* * ap_is_se_guest(): Check for SE guest with AP pass-through support. */ bool ap_is_se_guest(void) { return is_prot_virt_guest() && ap_sb_available(); } EXPORT_SYMBOL(ap_is_se_guest); /** * 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_qci(ap_qci_info)) { AP_DBF_INFO("%s QCI not supported\n", __func__); return; } memcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info)); 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->flags) 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->flags) 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: 1 if APQN exists and info is filled, * 0 if APQN seems to exist but there is no info * available (eg. caused by an asynch pending error) * -1 invalid APQN, TAPQ error or AP queue status which * indicates there is no APQN. */ static int ap_queue_info(ap_qid_t qid, struct ap_tapq_hwinfo *hwinfo, bool *decfg, bool *cstop) { struct ap_queue_status status; hwinfo->value = 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 -1; /* call TAPQ on this APQN */ status = ap_test_queue(qid, ap_apft_available(), hwinfo); 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: /* For all these RCs the tapq info should be available */ break; default: /* On a pending async error the info should be available */ if (!status.async) return -1; break; } /* There should be at least one of the mode bits set */ if (WARN_ON_ONCE(!hwinfo->value)) return 0; *decfg = status.response_code == AP_RESPONSE_DECONFIGURED; *cstop = status.response_code == AP_RESPONSE_CHECKSTOPPED; return 1; } 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_LOW_TIMEOUT: case AP_SM_WAIT_HIGH_TIMEOUT: spin_lock_bh(&ap_poll_timer_lock); if (!hrtimer_is_queued(&ap_poll_timer)) { hr_time = wait == AP_SM_WAIT_LOW_TIMEOUT ? poll_low_timeout : poll_high_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 * @tpi_info: ignored */ static void ap_interrupt_handler(struct airq_struct *airq, struct tpi_info *tpi_info) { 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 therefore * 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, const struct device_driver *drv) { const 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(const struct device *dev, struct kobj_uevent_env *env) { int rc = 0; const struct ap_device *ap_dev = to_ap_dev(dev); /* Uevents from ap bus core don't need extensions to the env */ if (dev == ap_root_device) return 0; if (is_card_dev(dev)) { struct ap_card *ac = to_ap_card(&ap_dev->device); /* Set up DEV_TYPE environment variable. */ rc = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); if (rc) return rc; /* Add MODALIAS= */ rc = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); if (rc) return rc; /* Add MODE=<accel|cca|ep11> */ if (ac->hwinfo.accel) rc = add_uevent_var(env, "MODE=accel"); else if (ac->hwinfo.cca) rc = add_uevent_var(env, "MODE=cca"); else if (ac->hwinfo.ep11) rc = add_uevent_var(env, "MODE=ep11"); if (rc) return rc; } else { struct ap_queue *aq = to_ap_queue(&ap_dev->device); /* Add MODE=<accel|cca|ep11> */ if (aq->card->hwinfo.accel) rc = add_uevent_var(env, "MODE=accel"); else if (aq->card->hwinfo.cca) rc = add_uevent_var(env, "MODE=cca"); else if (aq->card->hwinfo.ep11) rc = add_uevent_var(env, "MODE=ep11"); if (rc) return rc; } return 0; } static void ap_send_init_scan_done_uevent(void) { char *envp[] = { "INITSCAN=done", NULL }; kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp); } static void ap_send_bindings_complete_uevent(void) { char buf[32]; char *envp[] = { "BINDINGS=complete", buf, NULL }; snprintf(buf, sizeof(buf), "COMPLETECOUNT=%llu", atomic64_inc_return(&ap_bindings_complete_count)); kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp); } void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg) { char buf[16]; char *envp[] = { buf, NULL }; snprintf(buf, sizeof(buf), "CONFIG=%d", cfg ? 1 : 0); kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp); } EXPORT_SYMBOL(ap_send_config_uevent); void ap_send_online_uevent(struct ap_device *ap_dev, int online) { char buf[16]; char *envp[] = { buf, NULL }; snprintf(buf, sizeof(buf), "ONLINE=%d", online ? 1 : 0); kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp); } EXPORT_SYMBOL(ap_send_online_uevent); static void ap_send_mask_changed_uevent(unsigned long *newapm, unsigned long *newaqm) { char buf[100]; char *envp[] = { buf, NULL }; if (newapm) snprintf(buf, sizeof(buf), "APMASK=0x%016lx%016lx%016lx%016lx\n", newapm[0], newapm[1], newapm[2], newapm[3]); else snprintf(buf, sizeof(buf), "AQMASK=0x%016lx%016lx%016lx%016lx\n", newaqm[0], newaqm[1], newaqm[2], newaqm[3]); kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp); } /* * calc # of bound APQNs */ struct __ap_calc_ctrs { unsigned int apqns; unsigned int bound; }; static int __ap_calc_helper(struct device *dev, void *arg) { struct __ap_calc_ctrs *pctrs = (struct __ap_calc_ctrs *)arg; if (is_queue_dev(dev)) { pctrs->apqns++; if (dev->driver) pctrs->bound++; } return 0; } static void ap_calc_bound_apqns(unsigned int *apqns, unsigned int *bound) { struct __ap_calc_ctrs ctrs; memset(&ctrs, 0, sizeof(ctrs)); bus_for_each_dev(&ap_bus_type, NULL, (void *)&ctrs, __ap_calc_helper); *apqns = ctrs.apqns; *bound = ctrs.bound; } /* * After ap bus scan do check if all existing APQNs are * bound to device drivers. */ static void ap_check_bindings_complete(void) { unsigned int apqns, bound; if (atomic64_read(&ap_scan_bus_count) >= 1) { ap_calc_bound_apqns(&apqns, &bound); if (bound == apqns) { if (!completion_done(&ap_apqn_bindings_complete)) { complete_all(&ap_apqn_bindings_complete); ap_send_bindings_complete_uevent(); pr_debug("%s all apqn bindings complete\n", __func__); } } } } /* * Interface to wait for the AP bus to have done one initial ap bus * scan and all detected APQNs have been bound to device drivers. * If these both conditions are not fulfilled, this function blocks * on a condition with wait_for_completion_interruptible_timeout(). * If these both conditions are fulfilled (before the timeout hits) * the return value is 0. If the timeout (in jiffies) hits instead * -ETIME is returned. On failures negative return values are * returned to the caller. */ int ap_wait_apqn_bindings_complete(unsigned long timeout) { int rc = 0; long l; if (completion_done(&ap_apqn_bindings_complete)) return 0; if (timeout) l = wait_for_completion_interruptible_timeout( &ap_apqn_bindings_complete, timeout); else l = wait_for_completion_interruptible( &ap_apqn_bindings_complete); if (l < 0) rc = l == -ERESTARTSYS ? -EINTR : l; else if (l == 0 && timeout) rc = -ETIME; pr_debug("%s rc=%d\n", __func__, rc); return rc; } EXPORT_SYMBOL(ap_wait_apqn_bindings_complete); 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 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) { pr_debug("%s reprobing queue=%02x.%04x\n", __func__, card, queue); rc = device_reprobe(dev); if (rc) AP_DBF_WARN("%s reprobing queue=%02x.%04x failed\n", __func__, card, queue); } } return 0; } static void ap_bus_revise_bindings(void) { bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved); } /** * ap_owned_by_def_drv: indicates whether an AP adapter is reserved for the * default host driver or not. * @card: the APID of the adapter card to check * @queue: the APQI of the queue to check * * Note: the ap_perms_mutex must be locked by the caller of this function. * * Return: an int specifying whether the AP adapter is reserved for the host (1) * or not (0). */ 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; if (test_bit_inv(card, ap_perms.apm) && test_bit_inv(queue, ap_perms.aqm)) rc = 1; return rc; } EXPORT_SYMBOL(ap_owned_by_def_drv); /** * ap_apqn_in_matrix_owned_by_def_drv: indicates whether every APQN contained in * a set is reserved for the host drivers * or not. * @apm: a bitmap specifying a set of APIDs comprising the APQNs to check * @aqm: a bitmap specifying a set of APQIs comprising the APQNs to check * * Note: the ap_perms_mutex must be locked by the caller of this function. * * Return: an int specifying whether each APQN is reserved for the host (1) or * not (0) */ int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, unsigned long *aqm) { int card, queue, rc = 0; 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; 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; } /* * Rearm the bindings complete completion to trigger * bindings complete when all devices are bound again */ reinit_completion(&ap_apqn_bindings_complete); /* 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); 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); } out: if (rc) put_device(dev); return rc; } static void ap_device_remove(struct device *dev) { struct ap_device *ap_dev = to_ap_dev(dev); struct ap_driver *ap_drv = to_ap_drv(dev->driver); /* 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); } 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; int rc; drv->bus = &ap_bus_type; drv->owner = owner; drv->name = name; rc = driver_register(drv); ap_check_bindings_complete(); return rc; } EXPORT_SYMBOL(ap_driver_register); void ap_driver_unregister(struct ap_driver *ap_drv) { driver_unregister(&ap_drv->driver); } EXPORT_SYMBOL(ap_driver_unregister); /* * Enforce a synchronous AP bus rescan. * Returns true if the bus scan finds a change in the AP configuration * and AP devices have been added or deleted when this function returns. */ bool ap_bus_force_rescan(void) { unsigned long scan_counter = atomic64_read(&ap_scan_bus_count); bool rc = false; pr_debug(">%s scan counter=%lu\n", __func__, scan_counter); /* Only trigger AP bus scans after the initial scan is done */ if (scan_counter <= 0) goto out; /* Try to acquire the AP scan bus mutex */ if (mutex_trylock(&ap_scan_bus_mutex)) { /* mutex acquired, run the AP bus scan */ ap_scan_bus_result = ap_scan_bus(); rc = ap_scan_bus_result; mutex_unlock(&ap_scan_bus_mutex); goto out; } /* * Mutex acquire failed. So there is currently another task * already running the AP bus scan. Then let's simple wait * for the lock which means the other task has finished and * stored the result in ap_scan_bus_result. */ if (mutex_lock_interruptible(&ap_scan_bus_mutex)) { /* some error occurred, ignore and go out */ goto out; } rc = ap_scan_bus_result; mutex_unlock(&ap_scan_bus_mutex); out: pr_debug("%s rc=%d\n", __func__, rc); return rc; } EXPORT_SYMBOL(ap_bus_force_rescan); /* * A config change has happened, force an ap bus rescan. */ static int ap_bus_cfg_chg(struct notifier_block *nb, unsigned long action, void *data) { if (action != CHSC_NOTIFY_AP_CFG) return NOTIFY_DONE; pr_debug("%s config change, forcing bus rescan\n", __func__); ap_bus_force_rescan(); return NOTIFY_OK; } static struct notifier_block ap_bus_nb = { .notifier_call = ap_bus_cfg_chg, }; int ap_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; } EXPORT_SYMBOL(ap_hex2bitmap); /* * 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) { unsigned long 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; } static int ap_parse_bitmap_str(const char *str, unsigned long *bitmap, int bits, unsigned long *newmap) { unsigned long size; int rc; size = BITS_TO_LONGS(bits) * sizeof(unsigned long); if (*str == '+' || *str == '-') { memcpy(newmap, bitmap, size); rc = modify_bitmap(str, newmap, bits); } else { memset(newmap, 0, size); rc = ap_hex2bitmap(str, newmap, bits); } return rc; } 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; } rc = ap_parse_bitmap_str(str, bitmap, bits, newmap); 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(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%d\n", ap_domain_index); } static ssize_t ap_domain_store(const 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("%s stored new default domain=%d\n", __func__, domain); return count; } static BUS_ATTR_RW(ap_domain); static ssize_t ap_control_domain_mask_show(const struct bus_type *bus, char *buf) { if (!ap_qci_info->flags) /* QCI not supported */ return sysfs_emit(buf, "not supported\n"); return sysfs_emit(buf, "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(const struct bus_type *bus, char *buf) { if (!ap_qci_info->flags) /* QCI not supported */ return sysfs_emit(buf, "not supported\n"); return sysfs_emit(buf, "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(const struct bus_type *bus, char *buf) { if (!ap_qci_info->flags) /* QCI not supported */ return sysfs_emit(buf, "not supported\n"); return sysfs_emit(buf, "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(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%d\n", ap_irq_flag ? 1 : 0); } static BUS_ATTR_RO(ap_interrupts); static ssize_t config_time_show(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%d\n", ap_scan_bus_time); } static ssize_t config_time_store(const 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_scan_bus_time = time; mod_timer(&ap_scan_bus_timer, jiffies + ap_scan_bus_time * HZ); return count; } static BUS_ATTR_RW(config_time); static ssize_t poll_thread_show(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%d\n", ap_poll_kthread ? 1 : 0); } static ssize_t poll_thread_store(const struct bus_type *bus, const char *buf, size_t count) { bool value; int rc; rc = kstrtobool(buf, &value); if (rc) return rc; if (value) { 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(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%lu\n", poll_high_timeout); } static ssize_t poll_timeout_store(const struct bus_type *bus, const char *buf, size_t count) { unsigned long value; ktime_t hr_time; int rc; rc = kstrtoul(buf, 0, &value); if (rc) return rc; /* 120 seconds = maximum poll interval */ if (value > 120000000000UL) return -EINVAL; poll_high_timeout = value; hr_time = poll_high_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(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%d\n", ap_max_domain_id); } static BUS_ATTR_RO(ap_max_domain_id); static ssize_t ap_max_adapter_id_show(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%d\n", ap_max_adapter_id); } static BUS_ATTR_RO(ap_max_adapter_id); static ssize_t apmask_show(const struct bus_type *bus, char *buf) { int rc; if (mutex_lock_interruptible(&ap_perms_mutex)) return -ERESTARTSYS; rc = sysfs_emit(buf, "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 int __verify_card_reservations(struct device_driver *drv, void *data) { int rc = 0; struct ap_driver *ap_drv = to_ap_drv(drv); unsigned long *newapm = (unsigned long *)data; /* * increase the driver's module refcounter to be sure it is not * going away when we invoke the callback function. */ if (!try_module_get(drv->owner)) return 0; if (ap_drv->in_use) { rc = ap_drv->in_use(newapm, ap_perms.aqm); if (rc) rc = -EBUSY; } /* release the driver's module */ module_put(drv->owner); return rc; } static int apmask_commit(unsigned long *newapm) { int rc; unsigned long reserved[BITS_TO_LONGS(AP_DEVICES)]; /* * Check if any bits in the apmask have been set which will * result in queues being removed from non-default drivers */ if (bitmap_andnot(reserved, newapm, ap_perms.apm, AP_DEVICES)) { rc = bus_for_each_drv(&ap_bus_type, NULL, reserved, __verify_card_reservations); if (rc) return rc; } memcpy(ap_perms.apm, newapm, APMASKSIZE); return 0; } static ssize_t apmask_store(const struct bus_type *bus, const char *buf, size_t count) { int rc, changes = 0; DECLARE_BITMAP(newapm, AP_DEVICES); if (mutex_lock_interruptible(&ap_perms_mutex)) return -ERESTARTSYS; rc = ap_parse_bitmap_str(buf, ap_perms.apm, AP_DEVICES, newapm); if (rc) goto done; changes = memcmp(ap_perms.apm, newapm, APMASKSIZE); if (changes) rc = apmask_commit(newapm); done: mutex_unlock(&ap_perms_mutex); if (rc) return rc; if (changes) { ap_bus_revise_bindings(); ap_send_mask_changed_uevent(newapm, NULL); } return count; } static BUS_ATTR_RW(apmask); static ssize_t aqmask_show(const struct bus_type *bus, char *buf) { int rc; if (mutex_lock_interruptible(&ap_perms_mutex)) return -ERESTARTSYS; rc = sysfs_emit(buf, "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 int __verify_queue_reservations(struct device_driver *drv, void *data) { int rc = 0; struct ap_driver *ap_drv = to_ap_drv(drv); unsigned long *newaqm = (unsigned long *)data; /* * increase the driver's module refcounter to be sure it is not * going away when we invoke the callback function. */ if (!try_module_get(drv->owner)) return 0; if (ap_drv->in_use) { rc = ap_drv->in_use(ap_perms.apm, newaqm); if (rc) rc = -EBUSY; } /* release the driver's module */ module_put(drv->owner); return rc; } static int aqmask_commit(unsigned long *newaqm) { int rc; unsigned long reserved[BITS_TO_LONGS(AP_DOMAINS)]; /* * Check if any bits in the aqmask have been set which will * result in queues being removed from non-default drivers */ if (bitmap_andnot(reserved, newaqm, ap_perms.aqm, AP_DOMAINS)) { rc = bus_for_each_drv(&ap_bus_type, NULL, reserved, __verify_queue_reservations); if (rc) return rc; } memcpy(ap_perms.aqm, newaqm, AQMASKSIZE); return 0; } static ssize_t aqmask_store(const struct bus_type *bus, const char *buf, size_t count) { int rc, changes = 0; DECLARE_BITMAP(newaqm, AP_DOMAINS); if (mutex_lock_interruptible(&ap_perms_mutex)) return -ERESTARTSYS; rc = ap_parse_bitmap_str(buf, ap_perms.aqm, AP_DOMAINS, newaqm); if (rc) goto done; changes = memcmp(ap_perms.aqm, newaqm, APMASKSIZE); if (changes) rc = aqmask_commit(newaqm); done: mutex_unlock(&ap_perms_mutex); if (rc) return rc; if (changes) { ap_bus_revise_bindings(); ap_send_mask_changed_uevent(NULL, newaqm); } return count; } static BUS_ATTR_RW(aqmask); static ssize_t scans_show(const struct bus_type *bus, char *buf) { return sysfs_emit(buf, "%llu\n", atomic64_read(&ap_scan_bus_count)); } static ssize_t scans_store(const struct bus_type *bus, const char *buf, size_t count) { AP_DBF_INFO("%s force AP bus rescan\n", __func__); ap_bus_force_rescan(); return count; } static BUS_ATTR_RW(scans); static ssize_t bindings_show(const struct bus_type *bus, char *buf) { int rc; unsigned int apqns, n; ap_calc_bound_apqns(&apqns, &n); if (atomic64_read(&ap_scan_bus_count) >= 1 && n == apqns) rc = sysfs_emit(buf, "%u/%u (complete)\n", n, apqns); else rc = sysfs_emit(buf, "%u/%u\n", n, apqns); return rc; } static BUS_ATTR_RO(bindings); static ssize_t features_show(const struct bus_type *bus, char *buf) { int n = 0; if (!ap_qci_info->flags) /* QCI not supported */ return sysfs_emit(buf, "-\n"); if (ap_qci_info->apsc) n += sysfs_emit_at(buf, n, "APSC "); if (ap_qci_info->apxa) n += sysfs_emit_at(buf, n, "APXA "); if (ap_qci_info->qact) n += sysfs_emit_at(buf, n, "QACT "); if (ap_qci_info->rc8a) n += sysfs_emit_at(buf, n, "RC8A "); if (ap_qci_info->apsb) n += sysfs_emit_at(buf, n, "APSB "); sysfs_emit_at(buf, n == 0 ? 0 : n - 1, "\n"); return n; } static BUS_ATTR_RO(features); static struct attribute *ap_bus_attrs[] = { &bus_attr_ap_domain.attr, &bus_attr_ap_control_domain_mask.attr, &bus_attr_ap_usage_domain_mask.attr, &bus_attr_ap_adapter_mask.attr, &bus_attr_config_time.attr, &bus_attr_poll_thread.attr, &bus_attr_ap_interrupts.attr, &bus_attr_poll_timeout.attr, &bus_attr_ap_max_domain_id.attr, &bus_attr_ap_max_adapter_id.attr, &bus_attr_apmask.attr, &bus_attr_aqmask.attr, &bus_attr_scans.attr, &bus_attr_bindings.attr, &bus_attr_features.attr, NULL, }; ATTRIBUTE_GROUPS(ap_bus); static const struct bus_type ap_bus_type = { .name = "ap", .bus_groups = ap_bus_groups, .match = &ap_bus_match, .uevent = &ap_uevent, .probe = ap_device_probe, .remove = ap_device_remove, }; /** * 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; /* < CEX4 is not supported */ if (rawtype < AP_DEVICE_TYPE_CEX4) { AP_DBF_WARN("%s queue=%02x.%04x unsupported type %d\n", __func__, AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype); return 0; } /* up to CEX8 known and fully supported */ if (rawtype <= AP_DEVICE_TYPE_CEX8) return rawtype; /* * unknown new type > CEX8, check for compatibility * to the highest known and supported type which is * currently CEX8 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_CEX8; status = ap_qact(qid, 0, &apinfo); if (status.response_code == AP_RESPONSE_NORMAL && apinfo.cat >= AP_DEVICE_TYPE_CEX4 && apinfo.cat <= AP_DEVICE_TYPE_CEX8) comp_type = apinfo.cat; } if (!comp_type) AP_DBF_WARN("%s queue=%02x.%04x unable to map type %d\n", __func__, AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype); else if (comp_type != rawtype) AP_DBF_INFO("%s queue=%02x.%04x map type %d to %d\n", __func__, 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 notify_config_changed */ static int __drv_notify_config_changed(struct device_driver *drv, void *data) { struct ap_driver *ap_drv = to_ap_drv(drv); if (try_module_get(drv->owner)) { if (ap_drv->on_config_changed) ap_drv->on_config_changed(ap_qci_info, ap_qci_info_old); module_put(drv->owner); } return 0; } /* Notify all drivers about an qci config change */ static inline void notify_config_changed(void) { bus_for_each_drv(&ap_bus_type, NULL, NULL, __drv_notify_config_changed); } /* Helper function for notify_scan_complete */ static int __drv_notify_scan_complete(struct device_driver *drv, void *data) { struct ap_driver *ap_drv = to_ap_drv(drv); if (try_module_get(drv->owner)) { if (ap_drv->on_scan_complete) ap_drv->on_scan_complete(ap_qci_info, ap_qci_info_old); module_put(drv->owner); } return 0; } /* Notify all drivers about bus scan complete */ static inline void notify_scan_complete(void) { bus_for_each_drv(&ap_bus_type, NULL, NULL, __drv_notify_scan_complete); } /* * 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) { struct ap_tapq_hwinfo hwinfo; bool decfg, chkstop; struct ap_queue *aq; struct device *dev; ap_qid_t qid; int rc, dom; /* * 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 anymore, rm queue dev\n", __func__, ac->id, dom); device_unregister(dev); } goto put_dev_and_continue; } /* domain is valid, get info from this APQN */ rc = ap_queue_info(qid, &hwinfo, &decfg, &chkstop); switch (rc) { case -1: if (dev) { AP_DBF_INFO("%s(%d,%d) queue_info() failed, rm queue dev\n", __func__, ac->id, dom); device_unregister(dev); } fallthrough; case 0: goto put_dev_and_continue; default: break; } /* 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; aq->chkstop = chkstop; aq->se_bstate = hwinfo.bs; 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 dev created\n", __func__, ac->id, dom); } else if (chkstop) { AP_DBF_INFO("%s(%d,%d) new (chkstop) queue dev created\n", __func__, ac->id, dom); } else { /* nudge the queue's state machine */ ap_queue_init_state(aq); AP_DBF_INFO("%s(%d,%d) new queue dev created\n", __func__, ac->id, dom); } goto put_dev_and_continue; } /* handle state changes on already existing queue device */ spin_lock_bh(&aq->lock); /* SE bind state */ aq->se_bstate = hwinfo.bs; /* checkstop state */ if (chkstop && !aq->chkstop) { /* checkstop on */ aq->chkstop = true; if (aq->dev_state > AP_DEV_STATE_UNINITIATED) { aq->dev_state = AP_DEV_STATE_ERROR; aq->last_err_rc = AP_RESPONSE_CHECKSTOPPED; } spin_unlock_bh(&aq->lock); pr_debug("%s(%d,%d) queue dev checkstop on\n", __func__, ac->id, dom); /* 'receive' pending messages with -EAGAIN */ ap_flush_queue(aq); goto put_dev_and_continue; } else if (!chkstop && aq->chkstop) { /* checkstop off */ aq->chkstop = false; if (aq->dev_state > AP_DEV_STATE_UNINITIATED) _ap_queue_init_state(aq); spin_unlock_bh(&aq->lock); pr_debug("%s(%d,%d) queue dev checkstop off\n", __func__, ac->id, dom); goto put_dev_and_continue; } /* config state change */ 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); pr_debug("%s(%d,%d) queue dev config off\n", __func__, ac->id, dom); ap_send_config_uevent(&aq->ap_dev, aq->config); /* 'receive' pending messages with -EAGAIN */ ap_flush_queue(aq); goto put_dev_and_continue; } else if (!decfg && !aq->config) { /* config on this queue device */ aq->config = true; if (aq->dev_state > AP_DEV_STATE_UNINITIATED) _ap_queue_init_state(aq); spin_unlock_bh(&aq->lock); pr_debug("%s(%d,%d) queue dev config on\n", __func__, ac->id, dom); ap_send_config_uevent(&aq->ap_dev, aq->config); 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 dev 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) { struct ap_tapq_hwinfo hwinfo; int rc, dom, comp_type; bool decfg, chkstop; struct ap_card *ac; struct device *dev; ap_qid_t qid; /* 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 devs\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, &hwinfo, &decfg, &chkstop) > 0) break; } if (dom > ap_max_domain_id) { /* Could not find one valid APQN for this adapter */ if (ac) { AP_DBF_INFO("%s(%d) no type info (no APQN found), rm card and queue devs\n", __func__, ap); ap_scan_rm_card_dev_and_queue_devs(ac); put_device(dev); } else { pr_debug("%s(%d) no type info (no APQN found), ignored\n", __func__, ap); } return; } if (!hwinfo.at) { /* No apdater type info available, an unusable adapter */ if (ac) { AP_DBF_INFO("%s(%d) no valid type (0) info, rm card and queue devs\n", __func__, ap); ap_scan_rm_card_dev_and_queue_devs(ac); put_device(dev); } else { pr_debug("%s(%d) no valid type (0) info, ignored\n", __func__, ap); } return; } hwinfo.value &= TAPQ_CARD_HWINFO_MASK; /* filter card specific hwinfo */ if (ac) { /* Check APQN against existing card device for changes */ if (ac->hwinfo.at != hwinfo.at) { AP_DBF_INFO("%s(%d) hwtype %d changed, rm card and queue devs\n", __func__, ap, hwinfo.at); ap_scan_rm_card_dev_and_queue_devs(ac); put_device(dev); ac = NULL; } else if (ac->hwinfo.fac != hwinfo.fac) { AP_DBF_INFO("%s(%d) functions 0x%08x changed, rm card and queue devs\n", __func__, ap, hwinfo.fac); ap_scan_rm_card_dev_and_queue_devs(ac); put_device(dev); ac = NULL; } else { /* handle checkstop state change */ if (chkstop && !ac->chkstop) { /* checkstop on */ ac->chkstop = true; AP_DBF_INFO("%s(%d) card dev checkstop on\n", __func__, ap); } else if (!chkstop && ac->chkstop) { /* checkstop off */ ac->chkstop = false; AP_DBF_INFO("%s(%d) card dev checkstop off\n", __func__, ap); } /* handle config state change */ if (decfg && ac->config) { ac->config = false; AP_DBF_INFO("%s(%d) card dev config off\n", __func__, ap); ap_send_config_uevent(&ac->ap_dev, ac->config); } else if (!decfg && !ac->config) { ac->config = true; AP_DBF_INFO("%s(%d) card dev config on\n", __func__, ap); ap_send_config_uevent(&ac->ap_dev, ac->config); } } } if (!ac) { /* Build a new card device */ comp_type = ap_get_compatible_type(qid, hwinfo.at, hwinfo.fac); if (!comp_type) { AP_DBF_WARN("%s(%d) type %d, can't get compatibility type\n", __func__, ap, hwinfo.at); return; } ac = ap_card_create(ap, hwinfo, comp_type); if (!ac) { AP_DBF_WARN("%s(%d) ap_card_create() failed\n", __func__, ap); return; } ac->config = !decfg; ac->chkstop = chkstop; dev = &ac->ap_dev.device; dev->bus = &ap_bus_type; dev->parent = ap_root_device; dev_set_name(dev, "card%02x", ap); /* maybe enlarge ap_max_msg_size to support this card */ if (ac->maxmsgsize > atomic_read(&ap_max_msg_size)) { atomic_set(&ap_max_msg_size, ac->maxmsgsize); AP_DBF_INFO("%s(%d) ap_max_msg_size update to %d byte\n", __func__, ap, atomic_read(&ap_max_msg_size)); } /* 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 dev type=%d func=0x%08x created\n", __func__, ap, hwinfo.at, hwinfo.fac); else if (chkstop) AP_DBF_INFO("%s(%d) new (chkstop) card dev type=%d func=0x%08x created\n", __func__, ap, hwinfo.at, hwinfo.fac); else AP_DBF_INFO("%s(%d) new card dev type=%d func=0x%08x created\n", __func__, ap, hwinfo.at, hwinfo.fac); } /* 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_get_configuration - get the host AP configuration * * Stores the host AP configuration information returned from the previous call * to Query Configuration Information (QCI), then retrieves and stores the * current AP configuration returned from QCI. * * Return: true if the host AP configuration changed between calls to QCI; * otherwise, return false. */ static bool ap_get_configuration(void) { if (!ap_qci_info->flags) /* QCI not supported */ return false; memcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info)); ap_qci(ap_qci_info); return memcmp(ap_qci_info, ap_qci_info_old, sizeof(struct ap_config_info)) != 0; } /* * ap_config_has_new_aps - Check current against old qci info if * new adapters have appeared. Returns true if at least one new * adapter in the apm mask is showing up. Existing adapters or * receding adapters are not counted. */ static bool ap_config_has_new_aps(void) { unsigned long m[BITS_TO_LONGS(AP_DEVICES)]; if (!ap_qci_info->flags) return false; bitmap_andnot(m, (unsigned long *)ap_qci_info->apm, (unsigned long *)ap_qci_info_old->apm, AP_DEVICES); if (!bitmap_empty(m, AP_DEVICES)) return true; return false; } /* * ap_config_has_new_doms - Check current against old qci info if * new (usage) domains have appeared. Returns true if at least one * new domain in the aqm mask is showing up. Existing domains or * receding domains are not counted. */ static bool ap_config_has_new_doms(void) { unsigned long m[BITS_TO_LONGS(AP_DOMAINS)]; if (!ap_qci_info->flags) return false; bitmap_andnot(m, (unsigned long *)ap_qci_info->aqm, (unsigned long *)ap_qci_info_old->aqm, AP_DOMAINS); if (!bitmap_empty(m, AP_DOMAINS)) return true; return false; } /** * ap_scan_bus(): Scan the AP bus for new devices * Always run under mutex ap_scan_bus_mutex protection * which needs to get locked/unlocked by the caller! * Returns true if any config change has been detected * during the scan, otherwise false. */ static bool ap_scan_bus(void) { bool config_changed; int ap; pr_debug(">%s\n", __func__); /* (re-)fetch configuration via QCI */ config_changed = ap_get_configuration(); if (config_changed) { if (ap_config_has_new_aps() || ap_config_has_new_doms()) { /* * Appearance of new adapters and/or domains need to * build new ap devices which need to get bound to an * device driver. Thus reset the APQN bindings complete * completion. */ reinit_completion(&ap_apqn_bindings_complete); } /* post a config change notify */ notify_config_changed(); } ap_select_domain(); /* loop over all possible adapters */ for (ap = 0; ap <= ap_max_adapter_id; ap++) ap_scan_adapter(ap); /* scan complete notify */ if (config_changed) notify_scan_complete(); /* 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("%s no queue device with default domain %d available\n", __func__, ap_domain_index); } if (atomic64_inc_return(&ap_scan_bus_count) == 1) { pr_debug("%s init scan complete\n", __func__); ap_send_init_scan_done_uevent(); } ap_check_bindings_complete(); mod_timer(&ap_scan_bus_timer, jiffies + ap_scan_bus_time * HZ); pr_debug("<%s config_changed=%d\n", __func__, config_changed); return config_changed; } /* * Callback for the ap_scan_bus_timer * Runs periodically, workqueue timer (ap_scan_bus_time) */ static void ap_scan_bus_timer_callback(struct timer_list *unused) { /* * schedule work into the system long wq which when * the work is finally executed, calls the AP bus scan. */ queue_work(system_long_wq, &ap_scan_bus_work); } /* * Callback for the ap_scan_bus_work */ static void ap_scan_bus_wq_callback(struct work_struct *unused) { /* * Try to invoke an ap_scan_bus(). If the mutex acquisition * fails there is currently another task already running the * AP scan bus and there is no need to wait and re-trigger the * scan again. Please note at the end of the scan bus function * the AP scan bus timer is re-armed which triggers then the * ap_scan_bus_timer_callback which enqueues a work into the * system_long_wq which invokes this function here again. */ if (mutex_trylock(&ap_scan_bus_mutex)) { ap_scan_bus_result = ap_scan_bus(); mutex_unlock(&ap_scan_bus_mutex); } } static inline void __exit ap_async_exit(void) { if (ap_thread_flag) ap_poll_thread_stop(); chsc_notifier_unregister(&ap_bus_nb); cancel_work(&ap_scan_bus_work); hrtimer_cancel(&ap_poll_timer); timer_delete(&ap_scan_bus_timer); } static inline int __init ap_async_init(void) { int rc; /* Setup the AP bus rescan timer. */ timer_setup(&ap_scan_bus_timer, ap_scan_bus_timer_callback, 0); /* * Setup the high resolution poll timer. * If we are running under z/VM adjust polling to z/VM polling rate. */ if (MACHINE_IS_VM) poll_high_timeout = 1500000; hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); ap_poll_timer.function = ap_poll_timeout; queue_work(system_long_wq, &ap_scan_bus_work); rc = chsc_notifier_register(&ap_bus_nb); if (rc) goto out; /* Start the low priority AP bus poll thread. */ if (!ap_thread_flag) return 0; rc = ap_poll_thread_start(); if (rc) goto out_notifier; return 0; out_notifier: chsc_notifier_unregister(&ap_bus_nb); out: cancel_work(&ap_scan_bus_work); hrtimer_cancel(&ap_poll_timer); timer_delete(&ap_scan_bus_timer); return rc; } static inline void ap_irq_exit(void) { if (ap_irq_flag) unregister_adapter_interrupt(&ap_airq); } static inline int __init ap_irq_init(void) { int rc; if (!ap_interrupts_available() || !ap_useirq) return 0; rc = register_adapter_interrupt(&ap_airq); ap_irq_flag = (rc == 0); return rc; } static inline void ap_debug_exit(void) { debug_unregister(ap_dbf_info); } static inline int __init ap_debug_init(void) { ap_dbf_info = debug_register("ap", 2, 1, AP_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 usable 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; 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; } /* Create /sys/bus/ap. */ rc = bus_register(&ap_bus_type); if (rc) goto out; /* Create /sys/devices/ap. */ ap_root_device = root_device_register("ap"); rc = PTR_ERR_OR_ZERO(ap_root_device); if (rc) goto out_bus; ap_root_device->bus = &ap_bus_type; /* enable interrupts if available */ rc = ap_irq_init(); if (rc) goto out_device; /* Setup asynchronous work (timers, workqueue, etc). */ rc = ap_async_init(); if (rc) goto out_irq; return 0; out_irq: ap_irq_exit(); out_device: root_device_unregister(ap_root_device); out_bus: bus_unregister(&ap_bus_type); out: ap_debug_exit(); return rc; } static void __exit ap_module_exit(void) { ap_async_exit(); ap_irq_exit(); root_device_unregister(ap_root_device); bus_unregister(&ap_bus_type); ap_debug_exit(); } module_init(ap_module_init); module_exit(ap_module_exit);
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