Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1620 insertions, 0 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
new file mode 100644
index 000000000..027a53eec
--- /dev/null
+++ b/drivers/s390/crypto/ap_bus.c
@@ -0,0 +1,1620 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright IBM Corp. 2006, 2012
+ * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *	      Ralph Wuerthner <rwuerthn@de.ibm.com>
+ *	      Felix Beck <felix.beck@de.ibm.com>
+ *	      Holger Dengler <hd@linux.vnet.ibm.com>
+ *
+ * Adjunct processor bus.
+ */
+
+#define KMSG_COMPONENT "ap"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel_stat.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+#include <linux/notifier.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/suspend.h>
+#include <asm/airq.h>
+#include <linux/atomic.h>
+#include <asm/isc.h>
+#include <linux/hrtimer.h>
+#include <linux/ktime.h>
+#include <asm/facility.h>
+#include <linux/crypto.h>
+#include <linux/mod_devicetable.h>
+#include <linux/debugfs.h>
+#include <linux/ctype.h>
+
+#include "ap_bus.h"
+#include "ap_debug.h"
+
+/*
+ * Module parameters; note though this file itself isn't modular.
+ */
+int ap_domain_index = -1;	/* Adjunct Processor Domain Index */
+static DEFINE_SPINLOCK(ap_domain_lock);
+module_param_named(domain, ap_domain_index, int, 0440);
+MODULE_PARM_DESC(domain, "domain index for ap devices");
+EXPORT_SYMBOL(ap_domain_index);
+
+static int ap_thread_flag;
+module_param_named(poll_thread, ap_thread_flag, int, 0440);
+MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
+
+static char *apm_str;
+module_param_named(apmask, apm_str, charp, 0440);
+MODULE_PARM_DESC(apmask, "AP bus adapter mask.");
+
+static char *aqm_str;
+module_param_named(aqmask, aqm_str, charp, 0440);
+MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
+
+static struct device *ap_root_device;
+
+DEFINE_SPINLOCK(ap_list_lock);
+LIST_HEAD(ap_card_list);
+
+/* Default permissions (card and domain masking) */
+static struct ap_perms {
+	DECLARE_BITMAP(apm, AP_DEVICES);
+	DECLARE_BITMAP(aqm, AP_DOMAINS);
+} ap_perms;
+static DEFINE_MUTEX(ap_perms_mutex);
+
+static struct ap_config_info *ap_configuration;
+static bool initialised;
+
+/*
+ * AP bus related debug feature things.
+ */
+debug_info_t *ap_dbf_info;
+
+/*
+ * Workqueue timer for bus rescan.
+ */
+static struct timer_list ap_config_timer;
+static int ap_config_time = AP_CONFIG_TIME;
+static void ap_scan_bus(struct work_struct *);
+static DECLARE_WORK(ap_scan_work, ap_scan_bus);
+
+/*
+ * Tasklet & timer for AP request polling and interrupts
+ */
+static void ap_tasklet_fn(unsigned long);
+static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0);
+static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
+static struct task_struct *ap_poll_kthread;
+static DEFINE_MUTEX(ap_poll_thread_mutex);
+static DEFINE_SPINLOCK(ap_poll_timer_lock);
+static struct hrtimer ap_poll_timer;
+/*
+ * In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
+ * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.
+ */
+static unsigned long long poll_timeout = 250000;
+
+/* Suspend flag */
+static int ap_suspend_flag;
+/* Maximum domain id */
+static int ap_max_domain_id;
+/*
+ * Flag to check if domain was set through module parameter domain=. This is
+ * important when supsend and resume is done in a z/VM environment where the
+ * domain might change.
+ */
+static int user_set_domain;
+static struct bus_type ap_bus_type;
+
+/* Adapter interrupt definitions */
+static void ap_interrupt_handler(struct airq_struct *airq);
+
+static int ap_airq_flag;
+
+static struct airq_struct ap_airq = {
+	.handler = ap_interrupt_handler,
+	.isc = AP_ISC,
+};
+
+/**
+ * ap_using_interrupts() - Returns non-zero if interrupt support is
+ * available.
+ */
+static inline int ap_using_interrupts(void)
+{
+	return ap_airq_flag;
+}
+
+/**
+ * ap_airq_ptr() - Get the address of the adapter interrupt indicator
+ *
+ * Returns the address of the local-summary-indicator of the adapter
+ * interrupt handler for AP, or NULL if adapter interrupts are not
+ * available.
+ */
+void *ap_airq_ptr(void)
+{
+	if (ap_using_interrupts())
+		return ap_airq.lsi_ptr;
+	return NULL;
+}
+
+/**
+ * ap_interrupts_available(): Test if AP interrupts are available.
+ *
+ * Returns 1 if AP interrupts are available.
+ */
+static int ap_interrupts_available(void)
+{
+	return test_facility(65);
+}
+
+/**
+ * ap_configuration_available(): Test if AP configuration
+ * information is available.
+ *
+ * Returns 1 if AP configuration information is available.
+ */
+static int ap_configuration_available(void)
+{
+	return test_facility(12);
+}
+
+/**
+ * ap_apft_available(): Test if AP facilities test (APFT)
+ * facility is available.
+ *
+ * Returns 1 if APFT is is available.
+ */
+static int ap_apft_available(void)
+{
+	return test_facility(15);
+}
+
+/*
+ * ap_qact_available(): Test if the PQAP(QACT) subfunction is available.
+ *
+ * Returns 1 if the QACT subfunction is available.
+ */
+static inline int ap_qact_available(void)
+{
+	if (ap_configuration)
+		return ap_configuration->qact;
+	return 0;
+}
+
+/*
+ * ap_query_configuration(): 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_query_configuration(struct ap_config_info *info)
+{
+	if (!ap_configuration_available())
+		return -EOPNOTSUPP;
+	if (!info)
+		return -EINVAL;
+	return ap_qci(info);
+}
+EXPORT_SYMBOL(ap_query_configuration);
+
+/**
+ * ap_init_configuration(): Allocate and query configuration array.
+ */
+static void ap_init_configuration(void)
+{
+	if (!ap_configuration_available())
+		return;
+
+	ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL);
+	if (!ap_configuration)
+		return;
+	if (ap_query_configuration(ap_configuration) != 0) {
+		kfree(ap_configuration);
+		ap_configuration = NULL;
+		return;
+	}
+}
+
+/*
+ * ap_test_config(): helper function to extract the nrth bit
+ *		     within the unsigned int array field.
+ */
+static inline int ap_test_config(unsigned int *field, unsigned int nr)
+{
+	return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
+}
+
+/*
+ * ap_test_config_card_id(): Test, whether an AP card ID is configured.
+ * @id AP card ID
+ *
+ * Returns 0 if the card is not configured
+ *	   1 if the card is configured or
+ *	     if the configuration information is not available
+ */
+static inline int ap_test_config_card_id(unsigned int id)
+{
+	if (!ap_configuration)	/* QCI not supported */
+		/* only ids 0...3F may be probed */
+		return id < 0x40 ? 1 : 0;
+	return ap_test_config(ap_configuration->apm, id);
+}
+
+/*
+ * ap_test_config_domain(): Test, whether an AP usage domain is configured.
+ * @domain AP usage domain ID
+ *
+ * Returns 0 if the usage domain is not configured
+ *	   1 if the usage domain is configured or
+ *	     if the configuration information is not available
+ */
+static inline int ap_test_config_domain(unsigned int domain)
+{
+	if (!ap_configuration)	/* QCI not supported */
+		return domain < 16;
+	return ap_test_config(ap_configuration->aqm, domain);
+}
+
+/**
+ * ap_query_queue(): Check if an AP queue is available.
+ * @qid: The AP queue number
+ * @queue_depth: Pointer to queue depth value
+ * @device_type: Pointer to device type value
+ * @facilities: Pointer to facility indicator
+ */
+static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type,
+			  unsigned int *facilities)
+{
+	struct ap_queue_status status;
+	unsigned long info;
+	int nd;
+
+	if (!ap_test_config_card_id(AP_QID_CARD(qid)))
+		return -ENODEV;
+
+	status = ap_test_queue(qid, ap_apft_available(), &info);
+	switch (status.response_code) {
+	case AP_RESPONSE_NORMAL:
+		*queue_depth = (int)(info & 0xff);
+		*device_type = (int)((info >> 24) & 0xff);
+		*facilities = (unsigned int)(info >> 32);
+		/* Update maximum domain id */
+		nd = (info >> 16) & 0xff;
+		/* if N bit is available, z13 and newer */
+		if ((info & (1UL << 57)) && nd > 0)
+			ap_max_domain_id = nd;
+		else /* older machine types */
+			ap_max_domain_id = 15;
+		switch (*device_type) {
+			/* For CEX2 and CEX3 the available functions
+			 * are not refrected by the facilities bits.
+			 * Instead it is coded into the type. So here
+			 * modify the function bits based on the type.
+			 */
+		case AP_DEVICE_TYPE_CEX2A:
+		case AP_DEVICE_TYPE_CEX3A:
+			*facilities |= 0x08000000;
+			break;
+		case AP_DEVICE_TYPE_CEX2C:
+		case AP_DEVICE_TYPE_CEX3C:
+			*facilities |= 0x10000000;
+			break;
+		default:
+			break;
+		}
+		return 0;
+	case AP_RESPONSE_Q_NOT_AVAIL:
+	case AP_RESPONSE_DECONFIGURED:
+	case AP_RESPONSE_CHECKSTOPPED:
+	case AP_RESPONSE_INVALID_ADDRESS:
+		return -ENODEV;
+	case AP_RESPONSE_RESET_IN_PROGRESS:
+	case AP_RESPONSE_OTHERWISE_CHANGED:
+	case AP_RESPONSE_BUSY:
+		return -EBUSY;
+	default:
+		BUG();
+	}
+}
+
+void ap_wait(enum ap_wait wait)
+{
+	ktime_t hr_time;
+
+	switch (wait) {
+	case AP_WAIT_AGAIN:
+	case AP_WAIT_INTERRUPT:
+		if (ap_using_interrupts())
+			break;
+		if (ap_poll_kthread) {
+			wake_up(&ap_poll_wait);
+			break;
+		}
+		/* Fall through */
+	case AP_WAIT_TIMEOUT:
+		spin_lock_bh(&ap_poll_timer_lock);
+		if (!hrtimer_is_queued(&ap_poll_timer)) {
+			hr_time = poll_timeout;
+			hrtimer_forward_now(&ap_poll_timer, hr_time);
+			hrtimer_restart(&ap_poll_timer);
+		}
+		spin_unlock_bh(&ap_poll_timer_lock);
+		break;
+	case AP_WAIT_NONE:
+	default:
+		break;
+	}
+}
+
+/**
+ * ap_request_timeout(): Handling of request timeouts
+ * @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);
+
+	if (ap_suspend_flag)
+		return;
+	spin_lock_bh(&aq->lock);
+	ap_wait(ap_sm_event(aq, AP_EVENT_TIMEOUT));
+	spin_unlock_bh(&aq->lock);
+}
+
+/**
+ * ap_poll_timeout(): AP receive polling for finished AP requests.
+ * @unused: Unused pointer.
+ *
+ * Schedules the AP tasklet using a high resolution timer.
+ */
+static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
+{
+	if (!ap_suspend_flag)
+		tasklet_schedule(&ap_tasklet);
+	return HRTIMER_NORESTART;
+}
+
+/**
+ * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
+ * @airq: pointer to adapter interrupt descriptor
+ */
+static void ap_interrupt_handler(struct airq_struct *airq)
+{
+	inc_irq_stat(IRQIO_APB);
+	if (!ap_suspend_flag)
+		tasklet_schedule(&ap_tasklet);
+}
+
+/**
+ * ap_tasklet_fn(): Tasklet to poll all AP devices.
+ * @dummy: Unused variable
+ *
+ * Poll all AP devices on the bus.
+ */
+static void ap_tasklet_fn(unsigned long dummy)
+{
+	struct ap_card *ac;
+	struct ap_queue *aq;
+	enum ap_wait wait = AP_WAIT_NONE;
+
+	/* Reset the indicator if interrupts are used. Thus new interrupts can
+	 * be received. Doing it in the beginning of the tasklet is therefor
+	 * important that no requests on any AP get lost.
+	 */
+	if (ap_using_interrupts())
+		xchg(ap_airq.lsi_ptr, 0);
+
+	spin_lock_bh(&ap_list_lock);
+	for_each_ap_card(ac) {
+		for_each_ap_queue(aq, ac) {
+			spin_lock_bh(&aq->lock);
+			wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL));
+			spin_unlock_bh(&aq->lock);
+		}
+	}
+	spin_unlock_bh(&ap_list_lock);
+
+	ap_wait(wait);
+}
+
+static int ap_pending_requests(void)
+{
+	struct ap_card *ac;
+	struct ap_queue *aq;
+
+	spin_lock_bh(&ap_list_lock);
+	for_each_ap_card(ac) {
+		for_each_ap_queue(aq, ac) {
+			if (aq->queue_count == 0)
+				continue;
+			spin_unlock_bh(&ap_list_lock);
+			return 1;
+		}
+	}
+	spin_unlock_bh(&ap_list_lock);
+	return 0;
+}
+
+/**
+ * ap_poll_thread(): Thread that polls for finished requests.
+ * @data: Unused pointer
+ *
+ * AP bus poll thread. The purpose of this thread is to poll for
+ * finished requests in a loop if there is a "free" cpu - that is
+ * a cpu that doesn't have anything better to do. The polling stops
+ * as soon as there is another task or if all messages have been
+ * delivered.
+ */
+static int ap_poll_thread(void *data)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+	set_user_nice(current, MAX_NICE);
+	set_freezable();
+	while (!kthread_should_stop()) {
+		add_wait_queue(&ap_poll_wait, &wait);
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (ap_suspend_flag || !ap_pending_requests()) {
+			schedule();
+			try_to_freeze();
+		}
+		set_current_state(TASK_RUNNING);
+		remove_wait_queue(&ap_poll_wait, &wait);
+		if (need_resched()) {
+			schedule();
+			try_to_freeze();
+			continue;
+		}
+		ap_tasklet_fn(0);
+	}
+
+	return 0;
+}
+
+static int ap_poll_thread_start(void)
+{
+	int rc;
+
+	if (ap_using_interrupts() || ap_poll_kthread)
+		return 0;
+	mutex_lock(&ap_poll_thread_mutex);
+	ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
+	rc = PTR_ERR_OR_ZERO(ap_poll_kthread);
+	if (rc)
+		ap_poll_kthread = NULL;
+	mutex_unlock(&ap_poll_thread_mutex);
+	return rc;
+}
+
+static void ap_poll_thread_stop(void)
+{
+	if (!ap_poll_kthread)
+		return;
+	mutex_lock(&ap_poll_thread_mutex);
+	kthread_stop(ap_poll_kthread);
+	ap_poll_kthread = NULL;
+	mutex_unlock(&ap_poll_thread_mutex);
+}
+
+#define is_card_dev(x) ((x)->parent == ap_root_device)
+#define is_queue_dev(x) ((x)->parent != ap_root_device)
+
+/**
+ * ap_bus_match()
+ * @dev: Pointer to device
+ * @drv: Pointer to device_driver
+ *
+ * AP bus driver registration/unregistration.
+ */
+static int ap_bus_match(struct device *dev, struct device_driver *drv)
+{
+	struct ap_driver *ap_drv = to_ap_drv(drv);
+	struct ap_device_id *id;
+
+	/*
+	 * Compare device type of the device with the list of
+	 * supported types of the device_driver.
+	 */
+	for (id = ap_drv->ids; id->match_flags; id++) {
+		if (is_card_dev(dev) &&
+		    id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE &&
+		    id->dev_type == to_ap_dev(dev)->device_type)
+			return 1;
+		if (is_queue_dev(dev) &&
+		    id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE &&
+		    id->dev_type == to_ap_dev(dev)->device_type)
+			return 1;
+	}
+	return 0;
+}
+
+/**
+ * ap_uevent(): Uevent function for AP devices.
+ * @dev: Pointer to device
+ * @env: Pointer to kobj_uevent_env
+ *
+ * It sets up a single environment variable DEV_TYPE which contains the
+ * hardware device type.
+ */
+static int ap_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct ap_device *ap_dev = to_ap_dev(dev);
+	int retval = 0;
+
+	if (!ap_dev)
+		return -ENODEV;
+
+	/* Set up DEV_TYPE environment variable. */
+	retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
+	if (retval)
+		return retval;
+
+	/* Add MODALIAS= */
+	retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
+
+	return retval;
+}
+
+static int ap_dev_suspend(struct device *dev)
+{
+	struct ap_device *ap_dev = to_ap_dev(dev);
+
+	if (ap_dev->drv && ap_dev->drv->suspend)
+		ap_dev->drv->suspend(ap_dev);
+	return 0;
+}
+
+static int ap_dev_resume(struct device *dev)
+{
+	struct ap_device *ap_dev = to_ap_dev(dev);
+
+	if (ap_dev->drv && ap_dev->drv->resume)
+		ap_dev->drv->resume(ap_dev);
+	return 0;
+}
+
+static void ap_bus_suspend(void)
+{
+	AP_DBF(DBF_DEBUG, "%s running\n", __func__);
+
+	ap_suspend_flag = 1;
+	/*
+	 * Disable scanning for devices, thus we do not want to scan
+	 * for them after removing.
+	 */
+	flush_work(&ap_scan_work);
+	tasklet_disable(&ap_tasklet);
+}
+
+static int __ap_card_devices_unregister(struct device *dev, void *dummy)
+{
+	if (is_card_dev(dev))
+		device_unregister(dev);
+	return 0;
+}
+
+static int __ap_queue_devices_unregister(struct device *dev, void *dummy)
+{
+	if (is_queue_dev(dev))
+		device_unregister(dev);
+	return 0;
+}
+
+static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data)
+{
+	if (is_queue_dev(dev) &&
+	    AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data)
+		device_unregister(dev);
+	return 0;
+}
+
+static void ap_bus_resume(void)
+{
+	int rc;
+
+	AP_DBF(DBF_DEBUG, "%s running\n", __func__);
+
+	/* remove all queue devices */
+	bus_for_each_dev(&ap_bus_type, NULL, NULL,
+			 __ap_queue_devices_unregister);
+	/* remove all card devices */
+	bus_for_each_dev(&ap_bus_type, NULL, NULL,
+			 __ap_card_devices_unregister);
+
+	/* Reset thin interrupt setting */
+	if (ap_interrupts_available() && !ap_using_interrupts()) {
+		rc = register_adapter_interrupt(&ap_airq);
+		ap_airq_flag = (rc == 0);
+	}
+	if (!ap_interrupts_available() && ap_using_interrupts()) {
+		unregister_adapter_interrupt(&ap_airq);
+		ap_airq_flag = 0;
+	}
+	/* Reset domain */
+	if (!user_set_domain)
+		ap_domain_index = -1;
+	/* Get things going again */
+	ap_suspend_flag = 0;
+	if (ap_airq_flag)
+		xchg(ap_airq.lsi_ptr, 0);
+	tasklet_enable(&ap_tasklet);
+	queue_work(system_long_wq, &ap_scan_work);
+}
+
+static int ap_power_event(struct notifier_block *this, unsigned long event,
+			  void *ptr)
+{
+	switch (event) {
+	case PM_HIBERNATION_PREPARE:
+	case PM_SUSPEND_PREPARE:
+		ap_bus_suspend();
+		break;
+	case PM_POST_HIBERNATION:
+	case PM_POST_SUSPEND:
+		ap_bus_resume();
+		break;
+	default:
+		break;
+	}
+	return NOTIFY_DONE;
+}
+static struct notifier_block ap_power_notifier = {
+	.notifier_call = ap_power_event,
+};
+
+static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, ap_dev_resume);
+
+static struct bus_type ap_bus_type = {
+	.name = "ap",
+	.match = &ap_bus_match,
+	.uevent = &ap_uevent,
+	.pm = &ap_bus_pm_ops,
+};
+
+static int __ap_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(DBF_DEBUG, "reprobing queue=%02x.%04x\n",
+			       card, queue);
+			rc = device_reprobe(dev);
+		}
+	}
+
+	return 0;
+}
+
+static void ap_bus_revise_bindings(void)
+{
+	bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
+}
+
+int ap_owned_by_def_drv(int card, int queue)
+{
+	int rc = 0;
+
+	if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
+		return -EINVAL;
+
+	mutex_lock(&ap_perms_mutex);
+
+	if (test_bit_inv(card, ap_perms.apm)
+	    && test_bit_inv(queue, ap_perms.aqm))
+		rc = 1;
+
+	mutex_unlock(&ap_perms_mutex);
+
+	return rc;
+}
+EXPORT_SYMBOL(ap_owned_by_def_drv);
+
+int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
+				       unsigned long *aqm)
+{
+	int card, queue, rc = 0;
+
+	mutex_lock(&ap_perms_mutex);
+
+	for (card = 0; !rc && card < AP_DEVICES; card++)
+		if (test_bit_inv(card, apm) &&
+		    test_bit_inv(card, ap_perms.apm))
+			for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
+				if (test_bit_inv(queue, aqm) &&
+				    test_bit_inv(queue, ap_perms.aqm))
+					rc = 1;
+
+	mutex_unlock(&ap_perms_mutex);
+
+	return rc;
+}
+EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
+
+static int ap_device_probe(struct device *dev)
+{
+	struct ap_device *ap_dev = to_ap_dev(dev);
+	struct ap_driver *ap_drv = to_ap_drv(dev->driver);
+	int card, queue, devres, drvres, rc;
+
+	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)
+			return -ENODEV;
+		/* (re-)init queue's state machine */
+		ap_queue_reinit_state(to_ap_queue(dev));
+	}
+
+	/* Add queue/card to list of active queues/cards */
+	spin_lock_bh(&ap_list_lock);
+	if (is_card_dev(dev))
+		list_add(&to_ap_card(dev)->list, &ap_card_list);
+	else
+		list_add(&to_ap_queue(dev)->list,
+			 &to_ap_queue(dev)->card->queues);
+	spin_unlock_bh(&ap_list_lock);
+
+	ap_dev->drv = ap_drv;
+	rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
+
+	if (rc) {
+		spin_lock_bh(&ap_list_lock);
+		if (is_card_dev(dev))
+			list_del_init(&to_ap_card(dev)->list);
+		else
+			list_del_init(&to_ap_queue(dev)->list);
+		spin_unlock_bh(&ap_list_lock);
+		ap_dev->drv = NULL;
+	}
+
+	return rc;
+}
+
+static int ap_device_remove(struct device *dev)
+{
+	struct ap_device *ap_dev = to_ap_dev(dev);
+	struct ap_driver *ap_drv = ap_dev->drv;
+
+	if (is_queue_dev(dev))
+		ap_queue_remove(to_ap_queue(dev));
+	if (ap_drv->remove)
+		ap_drv->remove(ap_dev);
+
+	/* Remove queue/card from list of active queues/cards */
+	spin_lock_bh(&ap_list_lock);
+	if (is_card_dev(dev))
+		list_del_init(&to_ap_card(dev)->list);
+	else
+		list_del_init(&to_ap_queue(dev)->list);
+	spin_unlock_bh(&ap_list_lock);
+
+	return 0;
+}
+
+int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
+		       char *name)
+{
+	struct device_driver *drv = &ap_drv->driver;
+
+	if (!initialised)
+		return -ENODEV;
+
+	drv->bus = &ap_bus_type;
+	drv->probe = ap_device_probe;
+	drv->remove = ap_device_remove;
+	drv->owner = owner;
+	drv->name = name;
+	return driver_register(drv);
+}
+EXPORT_SYMBOL(ap_driver_register);
+
+void ap_driver_unregister(struct ap_driver *ap_drv)
+{
+	driver_unregister(&ap_drv->driver);
+}
+EXPORT_SYMBOL(ap_driver_unregister);
+
+void ap_bus_force_rescan(void)
+{
+	if (ap_suspend_flag)
+		return;
+	/* processing a asynchronous bus rescan */
+	del_timer(&ap_config_timer);
+	queue_work(system_long_wq, &ap_scan_work);
+	flush_work(&ap_scan_work);
+}
+EXPORT_SYMBOL(ap_bus_force_rescan);
+
+/*
+ * 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;
+}
+
+/*
+ * process_mask_arg() - parse a bitmap string and clear/set the
+ * bits in the bitmap accordingly. The string may be given as
+ * absolute value, a hex string like 0x1F2E3D4C5B6A" simple over-
+ * writing the current content of the bitmap. Or as relative string
+ * like "+1-16,-32,-0x40,+128" where only single bits or ranges of
+ * bits are cleared or set. Distinction is done based on the very
+ * first character which may be '+' or '-' for the relative string
+ * and othewise assume to be an absolute value string. If parsing fails
+ * a negative errno value is returned. All arguments and bitmaps are
+ * big endian order.
+ */
+static int process_mask_arg(const char *str,
+			    unsigned long *bitmap, int bits,
+			    struct mutex *lock)
+{
+	unsigned long *newmap, size;
+	int rc;
+
+	/* bits needs to be a multiple of 8 */
+	if (bits & 0x07)
+		return -EINVAL;
+
+	size = BITS_TO_LONGS(bits)*sizeof(unsigned long);
+	newmap = kmalloc(size, GFP_KERNEL);
+	if (!newmap)
+		return -ENOMEM;
+	if (mutex_lock_interruptible(lock)) {
+		kfree(newmap);
+		return -ERESTARTSYS;
+	}
+
+	if (*str == '+' || *str == '-') {
+		memcpy(newmap, bitmap, size);
+		rc = modify_bitmap(str, newmap, bits);
+	} else {
+		memset(newmap, 0, size);
+		rc = hex2bitmap(str, newmap, bits);
+	}
+	if (rc == 0)
+		memcpy(bitmap, newmap, size);
+	mutex_unlock(lock);
+	kfree(newmap);
+	return rc;
+}
+
+/*
+ * AP bus attributes.
+ */
+
+static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
+}
+
+static ssize_t ap_domain_store(struct bus_type *bus,
+			       const char *buf, size_t count)
+{
+	int domain;
+
+	if (sscanf(buf, "%i\n", &domain) != 1 ||
+	    domain < 0 || domain > ap_max_domain_id ||
+	    !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(DBF_DEBUG, "stored new default domain=%d\n", domain);
+
+	return count;
+}
+
+static BUS_ATTR_RW(ap_domain);
+
+static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
+{
+	if (!ap_configuration)	/* QCI not supported */
+		return snprintf(buf, PAGE_SIZE, "not supported\n");
+
+	return snprintf(buf, PAGE_SIZE,
+			"0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
+			ap_configuration->adm[0], ap_configuration->adm[1],
+			ap_configuration->adm[2], ap_configuration->adm[3],
+			ap_configuration->adm[4], ap_configuration->adm[5],
+			ap_configuration->adm[6], ap_configuration->adm[7]);
+}
+
+static BUS_ATTR_RO(ap_control_domain_mask);
+
+static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
+{
+	if (!ap_configuration)	/* QCI not supported */
+		return snprintf(buf, PAGE_SIZE, "not supported\n");
+
+	return snprintf(buf, PAGE_SIZE,
+			"0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
+			ap_configuration->aqm[0], ap_configuration->aqm[1],
+			ap_configuration->aqm[2], ap_configuration->aqm[3],
+			ap_configuration->aqm[4], ap_configuration->aqm[5],
+			ap_configuration->aqm[6], ap_configuration->aqm[7]);
+}
+
+static BUS_ATTR_RO(ap_usage_domain_mask);
+
+static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+			ap_using_interrupts() ? 1 : 0);
+}
+
+static BUS_ATTR_RO(ap_interrupts);
+
+static ssize_t config_time_show(struct bus_type *bus, char *buf)
+{
+	return snprintf(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 snprintf(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 snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
+}
+
+static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
+				  size_t count)
+{
+	unsigned long long time;
+	ktime_t hr_time;
+
+	/* 120 seconds = maximum poll interval */
+	if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
+	    time > 120000000000ULL)
+		return -EINVAL;
+	poll_timeout = time;
+	hr_time = poll_timeout;
+
+	spin_lock_bh(&ap_poll_timer_lock);
+	hrtimer_cancel(&ap_poll_timer);
+	hrtimer_set_expires(&ap_poll_timer, hr_time);
+	hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
+	spin_unlock_bh(&ap_poll_timer_lock);
+
+	return count;
+}
+
+static BUS_ATTR_RW(poll_timeout);
+
+static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
+{
+	int max_domain_id;
+
+	if (ap_configuration)
+		max_domain_id = ap_max_domain_id ? : -1;
+	else
+		max_domain_id = 15;
+	return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id);
+}
+
+static BUS_ATTR_RO(ap_max_domain_id);
+
+static ssize_t apmask_show(struct bus_type *bus, char *buf)
+{
+	int rc;
+
+	if (mutex_lock_interruptible(&ap_perms_mutex))
+		return -ERESTARTSYS;
+	rc = snprintf(buf, PAGE_SIZE,
+		      "0x%016lx%016lx%016lx%016lx\n",
+		      ap_perms.apm[0], ap_perms.apm[1],
+		      ap_perms.apm[2], ap_perms.apm[3]);
+	mutex_unlock(&ap_perms_mutex);
+
+	return rc;
+}
+
+static ssize_t apmask_store(struct bus_type *bus, const char *buf,
+			    size_t count)
+{
+	int rc;
+
+	rc = process_mask_arg(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex);
+	if (rc)
+		return rc;
+
+	ap_bus_revise_bindings();
+
+	return count;
+}
+
+static BUS_ATTR_RW(apmask);
+
+static ssize_t aqmask_show(struct bus_type *bus, char *buf)
+{
+	int rc;
+
+	if (mutex_lock_interruptible(&ap_perms_mutex))
+		return -ERESTARTSYS;
+	rc = snprintf(buf, PAGE_SIZE,
+		      "0x%016lx%016lx%016lx%016lx\n",
+		      ap_perms.aqm[0], ap_perms.aqm[1],
+		      ap_perms.aqm[2], ap_perms.aqm[3]);
+	mutex_unlock(&ap_perms_mutex);
+
+	return rc;
+}
+
+static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
+			    size_t count)
+{
+	int rc;
+
+	rc = process_mask_arg(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex);
+	if (rc)
+		return rc;
+
+	ap_bus_revise_bindings();
+
+	return count;
+}
+
+static BUS_ATTR_RW(aqmask);
+
+static struct bus_attribute *const ap_bus_attrs[] = {
+	&bus_attr_ap_domain,
+	&bus_attr_ap_control_domain_mask,
+	&bus_attr_ap_usage_domain_mask,
+	&bus_attr_config_time,
+	&bus_attr_poll_thread,
+	&bus_attr_ap_interrupts,
+	&bus_attr_poll_timeout,
+	&bus_attr_ap_max_domain_id,
+	&bus_attr_apmask,
+	&bus_attr_aqmask,
+	NULL,
+};
+
+/**
+ * ap_select_domain(): Select an AP domain if possible and we haven't
+ * already done so before.
+ */
+static void ap_select_domain(void)
+{
+	int count, max_count, best_domain;
+	struct ap_queue_status status;
+	int i, j;
+
+	/*
+	 * We want to use a single domain. Either the one specified with
+	 * the "domain=" parameter or the domain with the maximum number
+	 * of devices.
+	 */
+	spin_lock_bh(&ap_domain_lock);
+	if (ap_domain_index >= 0) {
+		/* Domain has already been selected. */
+		spin_unlock_bh(&ap_domain_lock);
+		return;
+	}
+	best_domain = -1;
+	max_count = 0;
+	for (i = 0; i < AP_DOMAINS; i++) {
+		if (!ap_test_config_domain(i) ||
+		    !test_bit_inv(i, ap_perms.aqm))
+			continue;
+		count = 0;
+		for (j = 0; j < AP_DEVICES; j++) {
+			if (!ap_test_config_card_id(j))
+				continue;
+			status = ap_test_queue(AP_MKQID(j, i),
+					       ap_apft_available(),
+					       NULL);
+			if (status.response_code != AP_RESPONSE_NORMAL)
+				continue;
+			count++;
+		}
+		if (count > max_count) {
+			max_count = count;
+			best_domain = i;
+		}
+	}
+	if (best_domain >= 0) {
+		ap_domain_index = best_domain;
+		AP_DBF(DBF_DEBUG, "new ap_domain_index=%d\n", ap_domain_index);
+	}
+	spin_unlock_bh(&ap_domain_lock);
+}
+
+/*
+ * 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)
+		return 0;
+	/* up to CEX6 known and fully supported */
+	if (rawtype <= AP_DEVICE_TYPE_CEX6)
+		return rawtype;
+	/*
+	 * unknown new type > CEX6, check for compatibility
+	 * to the highest known and supported type which is
+	 * currently CEX6 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_CEX6;
+		status = ap_qact(qid, 0, &apinfo);
+		if (status.response_code == AP_RESPONSE_NORMAL
+		    && apinfo.cat >= AP_DEVICE_TYPE_CEX2A
+		    && apinfo.cat <= AP_DEVICE_TYPE_CEX6)
+			comp_type = apinfo.cat;
+	}
+	if (!comp_type)
+		AP_DBF(DBF_WARN, "queue=%02x.%04x unable to map type %d\n",
+		       AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
+	else if (comp_type != rawtype)
+		AP_DBF(DBF_INFO, "queue=%02x.%04x map type %d to %d\n",
+		       AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype, comp_type);
+	return comp_type;
+}
+
+/*
+ * helper function to be used with bus_find_dev
+ * matches for the card device with the given id
+ */
+static int __match_card_device_with_id(struct device *dev, void *data)
+{
+	return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long) data;
+}
+
+/* helper function to be used with bus_find_dev
+ * matches for the queue device with a given qid
+ */
+static int __match_queue_device_with_qid(struct device *dev, void *data)
+{
+	return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
+}
+
+/**
+ * ap_scan_bus(): Scan the AP bus for new devices
+ * Runs periodically, workqueue timer (ap_config_time)
+ */
+static void ap_scan_bus(struct work_struct *unused)
+{
+	struct ap_queue *aq;
+	struct ap_card *ac;
+	struct device *dev;
+	ap_qid_t qid;
+	int comp_type, depth = 0, type = 0;
+	unsigned int func = 0;
+	int rc, id, dom, borked, domains, defdomdevs = 0;
+
+	AP_DBF(DBF_DEBUG, "%s running\n", __func__);
+
+	ap_query_configuration(ap_configuration);
+	ap_select_domain();
+
+	for (id = 0; id < AP_DEVICES; id++) {
+		/* check if device is registered */
+		dev = bus_find_device(&ap_bus_type, NULL,
+				      (void *)(long) id,
+				      __match_card_device_with_id);
+		ac = dev ? to_ap_card(dev) : NULL;
+		if (!ap_test_config_card_id(id)) {
+			if (dev) {
+				/* Card device has been removed from
+				 * configuration, remove the belonging
+				 * queue devices.
+				 */
+				bus_for_each_dev(&ap_bus_type, NULL,
+					(void *)(long) id,
+					__ap_queue_devices_with_id_unregister);
+				/* now remove the card device */
+				device_unregister(dev);
+				put_device(dev);
+			}
+			continue;
+		}
+		/* According to the configuration there should be a card
+		 * device, so check if there is at least one valid queue
+		 * and maybe create queue devices and the card device.
+		 */
+		domains = 0;
+		for (dom = 0; dom < AP_DOMAINS; dom++) {
+			qid = AP_MKQID(id, dom);
+			dev = bus_find_device(&ap_bus_type, NULL,
+					      (void *)(long) qid,
+					      __match_queue_device_with_qid);
+			aq = dev ? to_ap_queue(dev) : NULL;
+			if (!ap_test_config_domain(dom)) {
+				if (dev) {
+					/* Queue device exists but has been
+					 * removed from configuration.
+					 */
+					device_unregister(dev);
+					put_device(dev);
+				}
+				continue;
+			}
+			rc = ap_query_queue(qid, &depth, &type, &func);
+			if (dev) {
+				spin_lock_bh(&aq->lock);
+				if (rc == -ENODEV ||
+				    /* adapter reconfiguration */
+				    (ac && ac->functions != func))
+					aq->state = AP_STATE_BORKED;
+				borked = aq->state == AP_STATE_BORKED;
+				spin_unlock_bh(&aq->lock);
+				if (borked)	/* Remove broken device */
+					device_unregister(dev);
+				put_device(dev);
+				if (!borked) {
+					domains++;
+					if (dom == ap_domain_index)
+						defdomdevs++;
+					continue;
+				}
+			}
+			if (rc)
+				continue;
+			/* a new queue device is needed, check out comp type */
+			comp_type = ap_get_compatible_type(qid, type, func);
+			if (!comp_type)
+				continue;
+			/* maybe a card device needs to be created first */
+			if (!ac) {
+				ac = ap_card_create(id, depth, type,
+						    comp_type, func);
+				if (!ac)
+					continue;
+				ac->ap_dev.device.bus = &ap_bus_type;
+				ac->ap_dev.device.parent = ap_root_device;
+				dev_set_name(&ac->ap_dev.device,
+					     "card%02x", id);
+				/* Register card with AP bus */
+				rc = device_register(&ac->ap_dev.device);
+				if (rc) {
+					put_device(&ac->ap_dev.device);
+					ac = NULL;
+					break;
+				}
+				/* get it and thus adjust reference counter */
+				get_device(&ac->ap_dev.device);
+			}
+			/* now create the new queue device */
+			aq = ap_queue_create(qid, comp_type);
+			if (!aq)
+				continue;
+			aq->card = ac;
+			aq->ap_dev.device.bus = &ap_bus_type;
+			aq->ap_dev.device.parent = &ac->ap_dev.device;
+			dev_set_name(&aq->ap_dev.device,
+				     "%02x.%04x", id, dom);
+			/* Register device */
+			rc = device_register(&aq->ap_dev.device);
+			if (rc) {
+				put_device(&aq->ap_dev.device);
+				continue;
+			}
+			domains++;
+			if (dom == ap_domain_index)
+				defdomdevs++;
+		} /* end domain loop */
+		if (ac) {
+			/* remove card dev if there are no queue devices */
+			if (!domains)
+				device_unregister(&ac->ap_dev.device);
+			put_device(&ac->ap_dev.device);
+		}
+	} /* end device loop */
+
+	if (ap_domain_index >= 0 && defdomdevs < 1)
+		AP_DBF(DBF_INFO,
+		       "no queue device with default domain %d available\n",
+		       ap_domain_index);
+
+	mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
+}
+
+static void ap_config_timeout(struct timer_list *unused)
+{
+	if (ap_suspend_flag)
+		return;
+	queue_work(system_long_wq, &ap_scan_work);
+}
+
+static int __init ap_debug_init(void)
+{
+	ap_dbf_info = debug_register("ap", 1, 1,
+				     DBF_MAX_SPRINTF_ARGS * sizeof(long));
+	debug_register_view(ap_dbf_info, &debug_sprintf_view);
+	debug_set_level(ap_dbf_info, DBF_ERR);
+
+	return 0;
+}
+
+static void __init ap_perms_init(void)
+{
+	/* all resources useable if no kernel parameter string given */
+	memset(&ap_perms.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));
+		process_mask_arg(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));
+		process_mask_arg(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 max_domain_id;
+	int rc, i;
+
+	rc = ap_debug_init();
+	if (rc)
+		return rc;
+
+	if (!ap_instructions_available()) {
+		pr_warn("The hardware system does not support AP instructions\n");
+		return -ENODEV;
+	}
+
+	/* set up the AP permissions (ap and aq masks) */
+	ap_perms_init();
+
+	/* Get AP configuration data if available */
+	ap_init_configuration();
+
+	if (ap_configuration)
+		max_domain_id =
+			ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1;
+	else
+		max_domain_id = 15;
+	if (ap_domain_index < -1 || ap_domain_index > max_domain_id ||
+	    (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;
+	}
+	/* In resume callback we need to know if the user had set the domain.
+	 * If so, we can not just reset it.
+	 */
+	if (ap_domain_index >= 0)
+		user_set_domain = 1;
+
+	if (ap_interrupts_available()) {
+		rc = register_adapter_interrupt(&ap_airq);
+		ap_airq_flag = (rc == 0);
+	}
+
+	/* Create /sys/bus/ap. */
+	rc = bus_register(&ap_bus_type);
+	if (rc)
+		goto out;
+	for (i = 0; ap_bus_attrs[i]; i++) {
+		rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
+		if (rc)
+			goto out_bus;
+	}
+
+	/* Create /sys/devices/ap. */
+	ap_root_device = root_device_register("ap");
+	rc = PTR_ERR_OR_ZERO(ap_root_device);
+	if (rc)
+		goto out_bus;
+
+	/* Setup the AP bus rescan timer. */
+	timer_setup(&ap_config_timer, ap_config_timeout, 0);
+
+	/*
+	 * Setup the high resultion poll timer.
+	 * If we are running under z/VM adjust polling to z/VM polling rate.
+	 */
+	if (MACHINE_IS_VM)
+		poll_timeout = 1500000;
+	spin_lock_init(&ap_poll_timer_lock);
+	hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	ap_poll_timer.function = ap_poll_timeout;
+
+	/* Start the low priority AP bus poll thread. */
+	if (ap_thread_flag) {
+		rc = ap_poll_thread_start();
+		if (rc)
+			goto out_work;
+	}
+
+	rc = register_pm_notifier(&ap_power_notifier);
+	if (rc)
+		goto out_pm;
+
+	queue_work(system_long_wq, &ap_scan_work);
+	initialised = true;
+
+	return 0;
+
+out_pm:
+	ap_poll_thread_stop();
+out_work:
+	hrtimer_cancel(&ap_poll_timer);
+	root_device_unregister(ap_root_device);
+out_bus:
+	while (i--)
+		bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
+	bus_unregister(&ap_bus_type);
+out:
+	if (ap_using_interrupts())
+		unregister_adapter_interrupt(&ap_airq);
+	kfree(ap_configuration);
+	return rc;
+}
+device_initcall(ap_module_init);