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-rw-r--r--drivers/s390/crypto/ap_bus.c2317
1 files changed, 2317 insertions, 0 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
new file mode 100644
index 0000000000..d6ad437883
--- /dev/null
+++ b/drivers/s390/crypto/ap_bus.c
@@ -0,0 +1,2317 @@
+// 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 "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 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 bus scans since init */
+static atomic64_t ap_scan_bus_count;
+
+/* # of bindings complete since init */
+static atomic64_t ap_bindings_complete_count = ATOMIC64_INIT(0);
+
+/* completion for initial APQN bindings complete */
+static DECLARE_COMPLETION(ap_init_apqn_bindings_complete);
+
+static struct ap_config_info *ap_qci_info;
+static struct ap_config_info *ap_qci_info_old;
+
+/*
+ * 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 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 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)
+{
+ if (ap_qci_info)
+ return ap_qci_info->qact;
+ return 0;
+}
+
+/*
+ * 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)
+{
+ if (ap_qci_info)
+ return ap_qci_info->apsb;
+ return 0;
+}
+
+/*
+ * 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_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;
+ ap_qci_info_old = kzalloc(sizeof(*ap_qci_info_old), GFP_KERNEL);
+ if (!ap_qci_info_old) {
+ kfree(ap_qci_info);
+ ap_qci_info = NULL;
+ return;
+ }
+ if (ap_fetch_qci_info(ap_qci_info) != 0) {
+ kfree(ap_qci_info);
+ kfree(ap_qci_info_old);
+ ap_qci_info = NULL;
+ ap_qci_info_old = 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);
+ }
+ }
+
+ memcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));
+}
+
+/*
+ * 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: 1 if APQN exists and info is filled,
+ * 0 if APQN seems to exit 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, int *q_type, unsigned int *q_fac,
+ int *q_depth, int *q_ml, bool *q_decfg, bool *q_cstop)
+{
+ struct ap_queue_status status;
+ struct ap_tapq_gr2 tapq_info;
+
+ tapq_info.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(), &tapq_info);
+
+ /* handle pending async error with return 'no info available' */
+ if (status.async)
+ return 0;
+
+ 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(!tapq_info.value))
+ return 0;
+ *q_type = tapq_info.at;
+ *q_fac = tapq_info.fac;
+ *q_depth = tapq_info.qd;
+ *q_ml = tapq_info.ml;
+ *q_decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
+ *q_cstop = status.response_code == AP_RESPONSE_CHECKSTOPPED;
+ return 1;
+ default:
+ /*
+ * A response code which indicates, there is no info available.
+ */
+ 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, 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(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 (ap_test_bit(&ac->functions, AP_FUNC_ACCEL))
+ rc = add_uevent_var(env, "MODE=accel");
+ else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO))
+ rc = add_uevent_var(env, "MODE=cca");
+ else if (ap_test_bit(&ac->functions, AP_FUNC_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 (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL))
+ rc = add_uevent_var(env, "MODE=accel");
+ else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO))
+ rc = add_uevent_var(env, "MODE=cca");
+ else if (ap_test_bit(&aq->card->functions, AP_FUNC_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 initial 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_init_apqn_bindings_complete)) {
+ complete_all(&ap_init_apqn_bindings_complete);
+ AP_DBF_INFO("%s complete\n", __func__);
+ }
+ ap_send_bindings_complete_uevent();
+ }
+ }
+}
+
+/*
+ * 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_init_apqn_bindings_complete(unsigned long timeout)
+{
+ long l;
+
+ if (completion_done(&ap_init_apqn_bindings_complete))
+ return 0;
+
+ if (timeout)
+ l = wait_for_completion_interruptible_timeout(
+ &ap_init_apqn_bindings_complete, timeout);
+ else
+ l = wait_for_completion_interruptible(
+ &ap_init_apqn_bindings_complete);
+ if (l < 0)
+ return l == -ERESTARTSYS ? -EINTR : l;
+ else if (l == 0 && timeout)
+ return -ETIME;
+
+ return 0;
+}
+EXPORT_SYMBOL(ap_wait_init_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) {
+ AP_DBF_DBG("%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;
+ }
+
+ /* 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);
+ } else {
+ ap_check_bindings_complete();
+ }
+
+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;
+
+ drv->bus = &ap_bus_type;
+ 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)
+{
+ /* Only trigger AP bus scans after the initial scan is done */
+ if (atomic64_read(&ap_scan_bus_count) <= 0)
+ return;
+
+ /* processing a asynchronous bus rescan */
+ del_timer(&ap_config_timer);
+ queue_work(system_long_wq, &ap_scan_work);
+ flush_work(&ap_scan_work);
+}
+EXPORT_SYMBOL(ap_bus_force_rescan);
+
+/*
+ * 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;
+}
+
+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 = 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) /* 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) /* 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) /* 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_config_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_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(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) /* 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 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)
+{
+ int rc, dom, depth, type, ml;
+ bool decfg, chkstop;
+ struct ap_queue *aq;
+ struct device *dev;
+ unsigned int func;
+ ap_qid_t qid;
+
+ /*
+ * 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, &type, &func, &depth,
+ &ml, &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;
+ 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);
+ /* 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);
+ AP_DBF_DBG("%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);
+ AP_DBF_DBG("%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);
+ AP_DBF_DBG("%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);
+ AP_DBF_DBG("%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)
+{
+ int rc, dom, depth, type, comp_type, ml;
+ bool decfg, chkstop;
+ struct ap_card *ac;
+ struct device *dev;
+ unsigned int func;
+ 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, &type, &func, &depth,
+ &ml, &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 {
+ 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 devs\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 devs\n",
+ __func__, ap, type);
+ ap_scan_rm_card_dev_and_queue_devs(ac);
+ put_device(dev);
+ ac = NULL;
+ } else if ((ac->functions & TAPQ_CARD_FUNC_CMP_MASK) !=
+ (func & TAPQ_CARD_FUNC_CMP_MASK)) {
+ AP_DBF_INFO("%s(%d) functions 0x%08x changed, rm card and queue devs\n",
+ __func__, ap, func);
+ 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, 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, ml);
+ 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, type, func);
+ else if (chkstop)
+ AP_DBF_INFO("%s(%d) new (chkstop) card dev type=%d func=0x%08x created\n",
+ __func__, ap, type, func);
+ else
+ AP_DBF_INFO("%s(%d) new card dev 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_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) /* QCI not supported */
+ return false;
+
+ memcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));
+ ap_fetch_qci_info(ap_qci_info);
+
+ return memcmp(ap_qci_info, ap_qci_info_old,
+ sizeof(struct ap_config_info)) != 0;
+}
+
+/**
+ * ap_scan_bus(): Scan the AP bus for new devices
+ * Runs periodically, workqueue timer (ap_config_time)
+ * @unused: Unused pointer.
+ */
+static void ap_scan_bus(struct work_struct *unused)
+{
+ int ap, config_changed = 0;
+
+ /* config change notify */
+ config_changed = ap_get_configuration();
+ if (config_changed)
+ notify_config_changed();
+ 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);
+
+ /* 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) {
+ AP_DBF_DBG("%s init scan complete\n", __func__);
+ ap_send_init_scan_done_uevent();
+ ap_check_bindings_complete();
+ }
+
+ 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", 2, 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 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;
+ }
+
+ /* enable interrupts if available */
+ if (ap_interrupts_available() && ap_useirq) {
+ 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;
+
+ /* 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;
+
+ /* Setup the AP bus rescan timer. */
+ timer_setup(&ap_config_timer, ap_config_timeout, 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;
+
+ /* 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:
+ 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);