OSCL-LXR linux-6.0.1/​drivers/​s390/​crypto/​ap_bus.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright IBM Corp. 2006, 2021
  * 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 long poll_timeout = 250000;
 
 /* Maximum domain id, if not given via qci */
 static int ap_max_domain_id = 15;
 /* Maximum adapter id, if not given via qci */
 static int ap_max_adapter_id = 63;
 
 static struct bus_type ap_bus_type;
 
 /* Adapter interrupt definitions */
 static void ap_interrupt_handler(struct airq_struct *airq,
                  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_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)
         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 true if TAPQ succeeded and the info is filled or
  * false otherwise.
  */
 static bool ap_queue_info(ap_qid_t qid, int *q_type, unsigned int *q_fac,
               int *q_depth, int *q_ml, bool *q_decfg, bool *q_cstop)
 {
     struct ap_queue_status status;
     union {
         unsigned long value;
         struct {
             unsigned int fac   : 32; /* facility bits */
             unsigned int at    :  8; /* ap type */
             unsigned int _res1 :  8;
             unsigned int _res2 :  4;
             unsigned int ml    :  4; /* apxl ml */
             unsigned int _res3 :  4;
             unsigned int qd    :  4; /* queue depth */
         } 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 false;
 
     /* call TAPQ on this APQN */
     status = ap_test_queue(qid, ap_apft_available(), &tapq_info.value);
     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 false;
         *q_type = tapq_info.tapq_gr2.at;
         *q_fac = tapq_info.tapq_gr2.fac;
         *q_depth = tapq_info.tapq_gr2.qd;
         *q_ml = tapq_info.tapq_gr2.ml;
         *q_decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
         *q_cstop = status.response_code == AP_RESPONSE_CHECKSTOPPED;
         switch (*q_type) {
             /* For CEX2 and CEX3 the available functions
              * are not reflected by the facilities bits.
              * Instead it is coded into the type. So here
              * modify the function bits based on the type.
              */
         case AP_DEVICE_TYPE_CEX2A:
         case AP_DEVICE_TYPE_CEX3A:
             *q_fac |= 0x08000000;
             break;
         case AP_DEVICE_TYPE_CEX2C:
         case AP_DEVICE_TYPE_CEX3C:
             *q_fac |= 0x10000000;
             break;
         default:
             break;
         }
         return true;
     default:
         /*
          * A response code which indicates, there is no info available.
          */
         return false;
     }
 }
 
 void ap_wait(enum ap_sm_wait wait)
 {
     ktime_t hr_time;
 
     switch (wait) {
     case AP_SM_WAIT_AGAIN:
     case AP_SM_WAIT_INTERRUPT:
         if (ap_irq_flag)
             break;
         if (ap_poll_kthread) {
             wake_up(&ap_poll_wait);
             break;
         }
         fallthrough;
     case AP_SM_WAIT_TIMEOUT:
         spin_lock_bh(&ap_poll_timer_lock);
         if (!hrtimer_is_queued(&ap_poll_timer)) {
             hr_time = poll_timeout;
             hrtimer_forward_now(&ap_poll_timer, hr_time);
             hrtimer_restart(&ap_poll_timer);
         }
         spin_unlock_bh(&ap_poll_timer_lock);
         break;
     case AP_SM_WAIT_NONE:
     default:
         break;
     }
 }
 
 /**
  * ap_request_timeout(): Handling of request timeouts
  * @t: timer making this callback
  *
  * Handles request timeouts.
  */
 void ap_request_timeout(struct timer_list *t)
 {
     struct ap_queue *aq = from_timer(aq, t, timeout);
 
     spin_lock_bh(&aq->lock);
     ap_wait(ap_sm_event(aq, AP_SM_EVENT_TIMEOUT));
     spin_unlock_bh(&aq->lock);
 }
 
 /**
  * ap_poll_timeout(): AP receive polling for finished AP requests.
  * @unused: Unused pointer.
  *
  * Schedules the AP tasklet using a high resolution timer.
  */
 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
 {
     tasklet_schedule(&ap_tasklet);
     return HRTIMER_NORESTART;
 }
 
 /**
  * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
  * @airq: pointer to adapter interrupt descriptor
  * @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 therefor
      * important that no requests on any AP get lost.
      */
     if (ap_irq_flag)
         xchg(ap_airq.lsi_ptr, 0);
 
     spin_lock_bh(&ap_queues_lock);
     hash_for_each(ap_queues, bkt, aq, hnode) {
         spin_lock_bh(&aq->lock);
         wait = min(wait, ap_sm_event_loop(aq, AP_SM_EVENT_POLL));
         spin_unlock_bh(&aq->lock);
     }
     spin_unlock_bh(&ap_queues_lock);
 
     ap_wait(wait);
 }
 
 static int ap_pending_requests(void)
 {
     int bkt;
     struct ap_queue *aq;
 
     spin_lock_bh(&ap_queues_lock);
     hash_for_each(ap_queues, bkt, aq, hnode) {
         if (aq->queue_count == 0)
             continue;
         spin_unlock_bh(&ap_queues_lock);
         return 1;
     }
     spin_unlock_bh(&ap_queues_lock);
     return 0;
 }
 
 /**
  * ap_poll_thread(): Thread that polls for finished requests.
  * @data: Unused pointer
  *
  * AP bus poll thread. The purpose of this thread is to poll for
  * finished requests in a loop if there is a "free" cpu - that is
  * a cpu that doesn't have anything better to do. The polling stops
  * as soon as there is another task or if all messages have been
  * delivered.
  */
 static int ap_poll_thread(void *data)
 {
     DECLARE_WAITQUEUE(wait, current);
 
     set_user_nice(current, MAX_NICE);
     set_freezable();
     while (!kthread_should_stop()) {
         add_wait_queue(&ap_poll_wait, &wait);
         set_current_state(TASK_INTERRUPTIBLE);
         if (!ap_pending_requests()) {
             schedule();
             try_to_freeze();
         }
         set_current_state(TASK_RUNNING);
         remove_wait_queue(&ap_poll_wait, &wait);
         if (need_resched()) {
             schedule();
             try_to_freeze();
             continue;
         }
         ap_tasklet_fn(0);
     }
 
     return 0;
 }
 
 static int ap_poll_thread_start(void)
 {
     int rc;
 
     if (ap_irq_flag || ap_poll_kthread)
         return 0;
     mutex_lock(&ap_poll_thread_mutex);
     ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
     rc = PTR_ERR_OR_ZERO(ap_poll_kthread);
     if (rc)
         ap_poll_kthread = NULL;
     mutex_unlock(&ap_poll_thread_mutex);
     return rc;
 }
 
 static void ap_poll_thread_stop(void)
 {
     if (!ap_poll_kthread)
         return;
     mutex_lock(&ap_poll_thread_mutex);
     kthread_stop(ap_poll_kthread);
     ap_poll_kthread = NULL;
     mutex_unlock(&ap_poll_thread_mutex);
 }
 
 #define is_card_dev(x) ((x)->parent == ap_root_device)
 #define is_queue_dev(x) ((x)->parent != ap_root_device)
 
 /**
  * ap_bus_match()
  * @dev: Pointer to device
  * @drv: Pointer to device_driver
  *
  * AP bus driver registration/unregistration.
  */
 static int ap_bus_match(struct device *dev, struct device_driver *drv)
 {
     struct ap_driver *ap_drv = to_ap_drv(drv);
     struct ap_device_id *id;
 
     /*
      * Compare device type of the device with the list of
      * supported types of the device_driver.
      */
     for (id = ap_drv->ids; id->match_flags; id++) {
         if (is_card_dev(dev) &&
             id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE &&
             id->dev_type == to_ap_dev(dev)->device_type)
             return 1;
         if (is_queue_dev(dev) &&
             id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE &&
             id->dev_type == to_ap_dev(dev)->device_type)
             return 1;
     }
     return 0;
 }
 
 /**
  * ap_uevent(): Uevent function for AP devices.
  * @dev: Pointer to device
  * @env: Pointer to kobj_uevent_env
  *
  * It sets up a single environment variable DEV_TYPE which contains the
  * hardware device type.
  */
 static int ap_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
     int rc = 0;
     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)
 {
     /* 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(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
 }
 
 static ssize_t ap_domain_store(struct bus_type *bus,
                    const char *buf, size_t count)
 {
     int domain;
 
     if (sscanf(buf, "%i\n", &domain) != 1 ||
         domain < 0 || domain > ap_max_domain_id ||
         !test_bit_inv(domain, ap_perms.aqm))
         return -EINVAL;
 
     spin_lock_bh(&ap_domain_lock);
     ap_domain_index = domain;
     spin_unlock_bh(&ap_domain_lock);
 
     AP_DBF_INFO("%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(struct bus_type *bus, char *buf)
 {
     if (!ap_qci_info)   /* QCI not supported */
         return scnprintf(buf, PAGE_SIZE, "not supported\n");
 
     return scnprintf(buf, PAGE_SIZE,
              "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
              ap_qci_info->adm[0], ap_qci_info->adm[1],
              ap_qci_info->adm[2], ap_qci_info->adm[3],
              ap_qci_info->adm[4], ap_qci_info->adm[5],
              ap_qci_info->adm[6], ap_qci_info->adm[7]);
 }
 
 static BUS_ATTR_RO(ap_control_domain_mask);
 
 static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
 {
     if (!ap_qci_info)   /* QCI not supported */
         return scnprintf(buf, PAGE_SIZE, "not supported\n");
 
     return scnprintf(buf, PAGE_SIZE,
              "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
              ap_qci_info->aqm[0], ap_qci_info->aqm[1],
              ap_qci_info->aqm[2], ap_qci_info->aqm[3],
              ap_qci_info->aqm[4], ap_qci_info->aqm[5],
              ap_qci_info->aqm[6], ap_qci_info->aqm[7]);
 }
 
 static BUS_ATTR_RO(ap_usage_domain_mask);
 
 static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
 {
     if (!ap_qci_info)   /* QCI not supported */
         return scnprintf(buf, PAGE_SIZE, "not supported\n");
 
     return scnprintf(buf, PAGE_SIZE,
              "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
              ap_qci_info->apm[0], ap_qci_info->apm[1],
              ap_qci_info->apm[2], ap_qci_info->apm[3],
              ap_qci_info->apm[4], ap_qci_info->apm[5],
              ap_qci_info->apm[6], ap_qci_info->apm[7]);
 }
 
 static BUS_ATTR_RO(ap_adapter_mask);
 
 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%d\n",
              ap_irq_flag ? 1 : 0);
 }
 
 static BUS_ATTR_RO(ap_interrupts);
 
 static ssize_t config_time_show(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
 }
 
 static ssize_t config_time_store(struct bus_type *bus,
                  const char *buf, size_t count)
 {
     int time;
 
     if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
         return -EINVAL;
     ap_config_time = time;
     mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
     return count;
 }
 
 static BUS_ATTR_RW(config_time);
 
 static ssize_t poll_thread_show(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
 }
 
 static ssize_t poll_thread_store(struct bus_type *bus,
                  const char *buf, size_t count)
 {
     int flag, rc;
 
     if (sscanf(buf, "%d\n", &flag) != 1)
         return -EINVAL;
     if (flag) {
         rc = ap_poll_thread_start();
         if (rc)
             count = rc;
     } else {
         ap_poll_thread_stop();
     }
     return count;
 }
 
 static BUS_ATTR_RW(poll_thread);
 
 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
 }
 
 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
                   size_t count)
 {
     unsigned long long time;
     ktime_t hr_time;
 
     /* 120 seconds = maximum poll interval */
     if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
         time > 120000000000ULL)
         return -EINVAL;
     poll_timeout = time;
     hr_time = poll_timeout;
 
     spin_lock_bh(&ap_poll_timer_lock);
     hrtimer_cancel(&ap_poll_timer);
     hrtimer_set_expires(&ap_poll_timer, hr_time);
     hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
     spin_unlock_bh(&ap_poll_timer_lock);
 
     return count;
 }
 
 static BUS_ATTR_RW(poll_timeout);
 
 static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_domain_id);
 }
 
 static BUS_ATTR_RO(ap_max_domain_id);
 
 static ssize_t ap_max_adapter_id_show(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_adapter_id);
 }
 
 static BUS_ATTR_RO(ap_max_adapter_id);
 
 static ssize_t apmask_show(struct bus_type *bus, char *buf)
 {
     int rc;
 
     if (mutex_lock_interruptible(&ap_perms_mutex))
         return -ERESTARTSYS;
     rc = scnprintf(buf, PAGE_SIZE,
                "0x%016lx%016lx%016lx%016lx\n",
                ap_perms.apm[0], ap_perms.apm[1],
                ap_perms.apm[2], ap_perms.apm[3]);
     mutex_unlock(&ap_perms_mutex);
 
     return rc;
 }
 
 static 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(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(struct bus_type *bus, char *buf)
 {
     int rc;
 
     if (mutex_lock_interruptible(&ap_perms_mutex))
         return -ERESTARTSYS;
     rc = scnprintf(buf, PAGE_SIZE,
                "0x%016lx%016lx%016lx%016lx\n",
                ap_perms.aqm[0], ap_perms.aqm[1],
                ap_perms.aqm[2], ap_perms.aqm[3]);
     mutex_unlock(&ap_perms_mutex);
 
     return rc;
 }
 
 static 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(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(struct bus_type *bus, char *buf)
 {
     return scnprintf(buf, PAGE_SIZE, "%llu\n",
              atomic64_read(&ap_scan_bus_count));
 }
 
 static ssize_t scans_store(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(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 = scnprintf(buf, PAGE_SIZE, "%u/%u (complete)\n", n, apqns);
     else
         rc = scnprintf(buf, PAGE_SIZE, "%u/%u\n", n, apqns);
 
     return rc;
 }
 
 static BUS_ATTR_RO(bindings);
 
 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,
     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;
 
     /* < CEX2A is not supported */
     if (rawtype < AP_DEVICE_TYPE_CEX2A) {
         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_CEX2A &&
             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)
 {
     bool decfg, chkstop;
     ap_qid_t qid;
     unsigned int func;
     struct device *dev;
     struct ap_queue *aq;
     int rc, dom, depth, type, ml;
 
     /*
      * 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);
                 put_device(dev);
             }
             continue;
         }
         /* domain is valid, get info from this APQN */
         if (!ap_queue_info(qid, &type, &func, &depth,
                    &ml, &decfg, &chkstop)) {
             if (aq) {
                 AP_DBF_INFO("%s(%d,%d) queue_info() failed, rm queue dev\n",
                         __func__, ac->id, dom);
                 device_unregister(dev);
                 put_device(dev);
             }
             continue;
         }
         /* if no queue device exists, create a new one */
         if (!aq) {
             aq = ap_queue_create(qid, ac->ap_dev.device_type);
             if (!aq) {
                 AP_DBF_WARN("%s(%d,%d) ap_queue_create() failed\n",
                         __func__, ac->id, dom);
                 continue;
             }
             aq->card = ac;
             aq->config = !decfg;
             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
                 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) {
                 aq->dev_state = AP_DEV_STATE_OPERATING;
                 aq->sm_state = AP_SM_STATE_RESET_START;
             }
             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) {
                 aq->dev_state = AP_DEV_STATE_OPERATING;
                 aq->sm_state = AP_SM_STATE_RESET_START;
             }
             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)
 {
     bool decfg, chkstop;
     ap_qid_t qid;
     unsigned int func;
     struct device *dev;
     struct ap_card *ac;
     int rc, dom, depth, type, comp_type, ml;
 
     /* 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))
                 break;
         }
     if (dom > ap_max_domain_id) {
         /* Could not find a valid APQN for this adapter */
         if (ac) {
             AP_DBF_INFO("%s(%d) no type info (no APQN found), rm card and queue 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 != func) {
             AP_DBF_INFO("%s(%d) functions 0x%08x 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 {
             /* 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 resultion poll timer.
      * If we are running under z/VM adjust polling to z/VM polling rate.
      */
     if (MACHINE_IS_VM)
         poll_timeout = 1500000;
     hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
     ap_poll_timer.function = ap_poll_timeout;
 
     /* Start the low priority AP bus poll thread. */
     if (ap_thread_flag) {
         rc = ap_poll_thread_start();
         if (rc)
             goto out_work;
     }
 
     queue_work(system_long_wq, &ap_scan_work);
 
     return 0;
 
 out_work:
     hrtimer_cancel(&ap_poll_timer);
     root_device_unregister(ap_root_device);
 out_bus:
     bus_unregister(&ap_bus_type);
 out:
     if (ap_irq_flag)
         unregister_adapter_interrupt(&ap_airq);
     kfree(ap_qci_info);
     return rc;
 }
 device_initcall(ap_module_init);

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