ap_queue.c 18.4 KB
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/*
 * Copyright IBM Corp. 2016
 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 *
 * Adjunct processor bus, queue related code.
 */

#define KMSG_COMPONENT "ap"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/init.h>
#include <linux/slab.h>
#include <asm/facility.h>

#include "ap_bus.h"
#include "ap_asm.h"

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/**
 * ap_queue_irq_ctrl(): Control interruption on a AP queue.
 * @qirqctrl: struct ap_qirq_ctrl (64 bit value)
 * @ind: The notification indicator byte
 *
 * Returns AP queue status.
 *
 * Control interruption on the given AP queue.
 * Just a simple wrapper function for the low level PQAP(AQIC)
 * instruction available for other kernel modules.
 */
struct ap_queue_status ap_queue_irq_ctrl(ap_qid_t qid,
					 struct ap_qirq_ctrl qirqctrl,
					 void *ind)
{
	return ap_aqic(qid, qirqctrl, ind);
}
EXPORT_SYMBOL(ap_queue_irq_ctrl);

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/**
 * ap_queue_enable_interruption(): Enable interruption on an AP queue.
 * @qid: The AP queue number
 * @ind: the notification indicator byte
 *
 * Enables interruption on AP queue via ap_aqic(). Based on the return
 * value it waits a while and tests the AP queue if interrupts
 * have been switched on using ap_test_queue().
 */
static int ap_queue_enable_interruption(struct ap_queue *aq, void *ind)
{
	struct ap_queue_status status;
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	struct ap_qirq_ctrl qirqctrl = { 0 };
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	qirqctrl.ir = 1;
	qirqctrl.isc = AP_ISC;
	status = ap_aqic(aq->qid, qirqctrl, ind);
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	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
	case AP_RESPONSE_OTHERWISE_CHANGED:
		return 0;
	case AP_RESPONSE_Q_NOT_AVAIL:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
	case AP_RESPONSE_INVALID_ADDRESS:
		pr_err("Registering adapter interrupts for AP device %02x.%04x failed\n",
		       AP_QID_CARD(aq->qid),
		       AP_QID_QUEUE(aq->qid));
		return -EOPNOTSUPP;
	case AP_RESPONSE_RESET_IN_PROGRESS:
	case AP_RESPONSE_BUSY:
	default:
		return -EBUSY;
	}
}

/**
 * __ap_send(): Send message to adjunct processor queue.
 * @qid: The AP queue number
 * @psmid: The program supplied message identifier
 * @msg: The message text
 * @length: The message length
 * @special: Special Bit
 *
 * Returns AP queue status structure.
 * Condition code 1 on NQAP can't happen because the L bit is 1.
 * Condition code 2 on NQAP also means the send is incomplete,
 * because a segment boundary was reached. The NQAP is repeated.
 */
static inline struct ap_queue_status
__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length,
	  unsigned int special)
{
	if (special == 1)
		qid |= 0x400000UL;
	return ap_nqap(qid, psmid, msg, length);
}

int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
{
	struct ap_queue_status status;

	status = __ap_send(qid, psmid, msg, length, 0);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		return 0;
	case AP_RESPONSE_Q_FULL:
	case AP_RESPONSE_RESET_IN_PROGRESS:
		return -EBUSY;
	case AP_RESPONSE_REQ_FAC_NOT_INST:
		return -EINVAL;
	default:	/* Device is gone. */
		return -ENODEV;
	}
}
EXPORT_SYMBOL(ap_send);

int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
{
	struct ap_queue_status status;

	if (msg == NULL)
		return -EINVAL;
	status = ap_dqap(qid, psmid, msg, length);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		return 0;
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (status.queue_empty)
			return -ENOENT;
		return -EBUSY;
	case AP_RESPONSE_RESET_IN_PROGRESS:
		return -EBUSY;
	default:
		return -ENODEV;
	}
}
EXPORT_SYMBOL(ap_recv);

/* State machine definitions and helpers */

static enum ap_wait ap_sm_nop(struct ap_queue *aq)
{
	return AP_WAIT_NONE;
}

/**
 * ap_sm_recv(): Receive pending reply messages from an AP queue but do
 *	not change the state of the device.
 * @aq: pointer to the AP queue
 *
 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
 */
static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
{
	struct ap_queue_status status;
	struct ap_message *ap_msg;

	status = ap_dqap(aq->qid, &aq->reply->psmid,
			 aq->reply->message, aq->reply->length);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		aq->queue_count--;
		if (aq->queue_count > 0)
			mod_timer(&aq->timeout,
				  jiffies + aq->request_timeout);
		list_for_each_entry(ap_msg, &aq->pendingq, list) {
			if (ap_msg->psmid != aq->reply->psmid)
				continue;
			list_del_init(&ap_msg->list);
			aq->pendingq_count--;
			ap_msg->receive(aq, ap_msg, aq->reply);
			break;
		}
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (!status.queue_empty || aq->queue_count <= 0)
			break;
		/* The card shouldn't forget requests but who knows. */
		aq->queue_count = 0;
		list_splice_init(&aq->pendingq, &aq->requestq);
		aq->requestq_count += aq->pendingq_count;
		aq->pendingq_count = 0;
		break;
	default:
		break;
	}
	return status;
}

/**
 * ap_sm_read(): Receive pending reply messages from an AP queue.
 * @aq: pointer to the AP queue
 *
 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
 */
static enum ap_wait ap_sm_read(struct ap_queue *aq)
{
	struct ap_queue_status status;

	if (!aq->reply)
		return AP_WAIT_NONE;
	status = ap_sm_recv(aq);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		if (aq->queue_count > 0) {
			aq->state = AP_STATE_WORKING;
			return AP_WAIT_AGAIN;
		}
		aq->state = AP_STATE_IDLE;
		return AP_WAIT_NONE;
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (aq->queue_count > 0)
			return AP_WAIT_INTERRUPT;
		aq->state = AP_STATE_IDLE;
		return AP_WAIT_NONE;
	default:
		aq->state = AP_STATE_BORKED;
		return AP_WAIT_NONE;
	}
}

/**
 * ap_sm_suspend_read(): Receive pending reply messages from an AP queue
 * without changing the device state in between. In suspend mode we don't
 * allow sending new requests, therefore just fetch pending replies.
 * @aq: pointer to the AP queue
 *
 * Returns AP_WAIT_NONE or AP_WAIT_AGAIN
 */
static enum ap_wait ap_sm_suspend_read(struct ap_queue *aq)
{
	struct ap_queue_status status;

	if (!aq->reply)
		return AP_WAIT_NONE;
	status = ap_sm_recv(aq);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		if (aq->queue_count > 0)
			return AP_WAIT_AGAIN;
		/* fall through */
	default:
		return AP_WAIT_NONE;
	}
}

/**
 * ap_sm_write(): Send messages from the request queue to an AP queue.
 * @aq: pointer to the AP queue
 *
 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
 */
static enum ap_wait ap_sm_write(struct ap_queue *aq)
{
	struct ap_queue_status status;
	struct ap_message *ap_msg;

	if (aq->requestq_count <= 0)
		return AP_WAIT_NONE;
	/* Start the next request on the queue. */
	ap_msg = list_entry(aq->requestq.next, struct ap_message, list);
	status = __ap_send(aq->qid, ap_msg->psmid,
			   ap_msg->message, ap_msg->length, ap_msg->special);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		aq->queue_count++;
		if (aq->queue_count == 1)
			mod_timer(&aq->timeout, jiffies + aq->request_timeout);
		list_move_tail(&ap_msg->list, &aq->pendingq);
		aq->requestq_count--;
		aq->pendingq_count++;
		if (aq->queue_count < aq->card->queue_depth) {
			aq->state = AP_STATE_WORKING;
			return AP_WAIT_AGAIN;
		}
		/* fall through */
	case AP_RESPONSE_Q_FULL:
		aq->state = AP_STATE_QUEUE_FULL;
		return AP_WAIT_INTERRUPT;
	case AP_RESPONSE_RESET_IN_PROGRESS:
		aq->state = AP_STATE_RESET_WAIT;
		return AP_WAIT_TIMEOUT;
	case AP_RESPONSE_MESSAGE_TOO_BIG:
	case AP_RESPONSE_REQ_FAC_NOT_INST:
		list_del_init(&ap_msg->list);
		aq->requestq_count--;
		ap_msg->rc = -EINVAL;
		ap_msg->receive(aq, ap_msg, NULL);
		return AP_WAIT_AGAIN;
	default:
		aq->state = AP_STATE_BORKED;
		return AP_WAIT_NONE;
	}
}

/**
 * ap_sm_read_write(): Send and receive messages to/from an AP queue.
 * @aq: pointer to the AP queue
 *
 * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
 */
static enum ap_wait ap_sm_read_write(struct ap_queue *aq)
{
	return min(ap_sm_read(aq), ap_sm_write(aq));
}

/**
 * ap_sm_reset(): Reset an AP queue.
 * @qid: The AP queue number
 *
 * Submit the Reset command to an AP queue.
 */
static enum ap_wait ap_sm_reset(struct ap_queue *aq)
{
	struct ap_queue_status status;

	status = ap_rapq(aq->qid);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
	case AP_RESPONSE_RESET_IN_PROGRESS:
		aq->state = AP_STATE_RESET_WAIT;
		aq->interrupt = AP_INTR_DISABLED;
		return AP_WAIT_TIMEOUT;
	case AP_RESPONSE_BUSY:
		return AP_WAIT_TIMEOUT;
	case AP_RESPONSE_Q_NOT_AVAIL:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
	default:
		aq->state = AP_STATE_BORKED;
		return AP_WAIT_NONE;
	}
}

/**
 * ap_sm_reset_wait(): Test queue for completion of the reset operation
 * @aq: pointer to the AP queue
 *
 * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
 */
static enum ap_wait ap_sm_reset_wait(struct ap_queue *aq)
{
	struct ap_queue_status status;
	void *lsi_ptr;

	if (aq->queue_count > 0 && aq->reply)
		/* Try to read a completed message and get the status */
		status = ap_sm_recv(aq);
	else
		/* Get the status with TAPQ */
		status = ap_tapq(aq->qid, NULL);

	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		lsi_ptr = ap_airq_ptr();
		if (lsi_ptr && ap_queue_enable_interruption(aq, lsi_ptr) == 0)
			aq->state = AP_STATE_SETIRQ_WAIT;
		else
			aq->state = (aq->queue_count > 0) ?
				AP_STATE_WORKING : AP_STATE_IDLE;
		return AP_WAIT_AGAIN;
	case AP_RESPONSE_BUSY:
	case AP_RESPONSE_RESET_IN_PROGRESS:
		return AP_WAIT_TIMEOUT;
	case AP_RESPONSE_Q_NOT_AVAIL:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
	default:
		aq->state = AP_STATE_BORKED;
		return AP_WAIT_NONE;
	}
}

/**
 * ap_sm_setirq_wait(): Test queue for completion of the irq enablement
 * @aq: pointer to the AP queue
 *
 * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
 */
static enum ap_wait ap_sm_setirq_wait(struct ap_queue *aq)
{
	struct ap_queue_status status;

	if (aq->queue_count > 0 && aq->reply)
		/* Try to read a completed message and get the status */
		status = ap_sm_recv(aq);
	else
		/* Get the status with TAPQ */
		status = ap_tapq(aq->qid, NULL);

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	if (status.irq_enabled == 1) {
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		/* Irqs are now enabled */
		aq->interrupt = AP_INTR_ENABLED;
		aq->state = (aq->queue_count > 0) ?
			AP_STATE_WORKING : AP_STATE_IDLE;
	}

	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		if (aq->queue_count > 0)
			return AP_WAIT_AGAIN;
		/* fallthrough */
	case AP_RESPONSE_NO_PENDING_REPLY:
		return AP_WAIT_TIMEOUT;
	default:
		aq->state = AP_STATE_BORKED;
		return AP_WAIT_NONE;
	}
}

/*
 * AP state machine jump table
 */
static ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = {
	[AP_STATE_RESET_START] = {
		[AP_EVENT_POLL] = ap_sm_reset,
		[AP_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_STATE_RESET_WAIT] = {
		[AP_EVENT_POLL] = ap_sm_reset_wait,
		[AP_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_STATE_SETIRQ_WAIT] = {
		[AP_EVENT_POLL] = ap_sm_setirq_wait,
		[AP_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_STATE_IDLE] = {
		[AP_EVENT_POLL] = ap_sm_write,
		[AP_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_STATE_WORKING] = {
		[AP_EVENT_POLL] = ap_sm_read_write,
		[AP_EVENT_TIMEOUT] = ap_sm_reset,
	},
	[AP_STATE_QUEUE_FULL] = {
		[AP_EVENT_POLL] = ap_sm_read,
		[AP_EVENT_TIMEOUT] = ap_sm_reset,
	},
	[AP_STATE_SUSPEND_WAIT] = {
		[AP_EVENT_POLL] = ap_sm_suspend_read,
		[AP_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_STATE_BORKED] = {
		[AP_EVENT_POLL] = ap_sm_nop,
		[AP_EVENT_TIMEOUT] = ap_sm_nop,
	},
};

enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event)
{
	return ap_jumptable[aq->state][event](aq);
}

enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event)
{
	enum ap_wait wait;

	while ((wait = ap_sm_event(aq, event)) == AP_WAIT_AGAIN)
		;
	return wait;
}

/*
 * Power management for queue devices
 */
void ap_queue_suspend(struct ap_device *ap_dev)
{
	struct ap_queue *aq = to_ap_queue(&ap_dev->device);

	/* Poll on the device until all requests are finished. */
	spin_lock_bh(&aq->lock);
	aq->state = AP_STATE_SUSPEND_WAIT;
	while (ap_sm_event(aq, AP_EVENT_POLL) != AP_WAIT_NONE)
		;
	aq->state = AP_STATE_BORKED;
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_queue_suspend);

void ap_queue_resume(struct ap_device *ap_dev)
{
}
EXPORT_SYMBOL(ap_queue_resume);

/*
 * AP queue related attributes.
 */
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static ssize_t ap_req_count_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
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{
	struct ap_queue *aq = to_ap_queue(dev);
	unsigned int req_cnt;

	spin_lock_bh(&aq->lock);
	req_cnt = aq->total_request_count;
	spin_unlock_bh(&aq->lock);
	return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
}

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static ssize_t ap_req_count_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct ap_queue *aq = to_ap_queue(dev);

	spin_lock_bh(&aq->lock);
	aq->total_request_count = 0;
	spin_unlock_bh(&aq->lock);

	return count;
}

static DEVICE_ATTR(request_count, 0644, ap_req_count_show, ap_req_count_store);
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static ssize_t ap_requestq_count_show(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	unsigned int reqq_cnt = 0;

	spin_lock_bh(&aq->lock);
	reqq_cnt = aq->requestq_count;
	spin_unlock_bh(&aq->lock);
	return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
}

static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);

static ssize_t ap_pendingq_count_show(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	unsigned int penq_cnt = 0;

	spin_lock_bh(&aq->lock);
	penq_cnt = aq->pendingq_count;
	spin_unlock_bh(&aq->lock);
	return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
}

static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);

static ssize_t ap_reset_show(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc = 0;

	spin_lock_bh(&aq->lock);
	switch (aq->state) {
	case AP_STATE_RESET_START:
	case AP_STATE_RESET_WAIT:
		rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n");
		break;
	case AP_STATE_WORKING:
	case AP_STATE_QUEUE_FULL:
		rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n");
		break;
	default:
		rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n");
	}
	spin_unlock_bh(&aq->lock);
	return rc;
}

static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL);

static ssize_t ap_interrupt_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc = 0;

	spin_lock_bh(&aq->lock);
	if (aq->state == AP_STATE_SETIRQ_WAIT)
		rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n");
	else if (aq->interrupt == AP_INTR_ENABLED)
		rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n");
	else
		rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n");
	spin_unlock_bh(&aq->lock);
	return rc;
}

static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL);

static struct attribute *ap_queue_dev_attrs[] = {
	&dev_attr_request_count.attr,
	&dev_attr_requestq_count.attr,
	&dev_attr_pendingq_count.attr,
	&dev_attr_reset.attr,
	&dev_attr_interrupt.attr,
	NULL
};

static struct attribute_group ap_queue_dev_attr_group = {
	.attrs = ap_queue_dev_attrs
};

static const struct attribute_group *ap_queue_dev_attr_groups[] = {
	&ap_queue_dev_attr_group,
	NULL
};

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static struct device_type ap_queue_type = {
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	.name = "ap_queue",
	.groups = ap_queue_dev_attr_groups,
};

static void ap_queue_device_release(struct device *dev)
{
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	struct ap_queue *aq = to_ap_queue(dev);

	if (!list_empty(&aq->list)) {
		spin_lock_bh(&ap_list_lock);
		list_del_init(&aq->list);
		spin_unlock_bh(&ap_list_lock);
	}
	kfree(aq);
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}

struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type)
{
	struct ap_queue *aq;

	aq = kzalloc(sizeof(*aq), GFP_KERNEL);
	if (!aq)
		return NULL;
	aq->ap_dev.device.release = ap_queue_device_release;
	aq->ap_dev.device.type = &ap_queue_type;
	aq->ap_dev.device_type = device_type;
	aq->qid = qid;
	aq->state = AP_STATE_RESET_START;
	aq->interrupt = AP_INTR_DISABLED;
	spin_lock_init(&aq->lock);
	INIT_LIST_HEAD(&aq->pendingq);
	INIT_LIST_HEAD(&aq->requestq);
	setup_timer(&aq->timeout, ap_request_timeout, (unsigned long) aq);

	return aq;
}

void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *reply)
{
	aq->reply = reply;

	spin_lock_bh(&aq->lock);
	ap_wait(ap_sm_event(aq, AP_EVENT_POLL));
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_queue_init_reply);

/**
 * ap_queue_message(): Queue a request to an AP device.
 * @aq: The AP device to queue the message to
 * @ap_msg: The message that is to be added
 */
void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg)
{
	/* For asynchronous message handling a valid receive-callback
	 * is required.
	 */
	BUG_ON(!ap_msg->receive);

	spin_lock_bh(&aq->lock);
	/* Queue the message. */
	list_add_tail(&ap_msg->list, &aq->requestq);
	aq->requestq_count++;
	aq->total_request_count++;
667
	atomic_inc(&aq->card->total_request_count);
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
	/* Send/receive as many request from the queue as possible. */
	ap_wait(ap_sm_event_loop(aq, AP_EVENT_POLL));
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_queue_message);

/**
 * ap_cancel_message(): Cancel a crypto request.
 * @aq: The AP device that has the message queued
 * @ap_msg: The message that is to be removed
 *
 * Cancel a crypto request. This is done by removing the request
 * from the device pending or request queue. Note that the
 * request stays on the AP queue. When it finishes the message
 * reply will be discarded because the psmid can't be found.
 */
void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg)
{
	struct ap_message *tmp;

	spin_lock_bh(&aq->lock);
	if (!list_empty(&ap_msg->list)) {
		list_for_each_entry(tmp, &aq->pendingq, list)
			if (tmp->psmid == ap_msg->psmid) {
				aq->pendingq_count--;
				goto found;
			}
		aq->requestq_count--;
found:
		list_del_init(&ap_msg->list);
	}
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_cancel_message);

/**
 * __ap_flush_queue(): Flush requests.
 * @aq: Pointer to the AP queue
 *
 * Flush all requests from the request/pending queue of an AP device.
 */
static void __ap_flush_queue(struct ap_queue *aq)
{
	struct ap_message *ap_msg, *next;

	list_for_each_entry_safe(ap_msg, next, &aq->pendingq, list) {
		list_del_init(&ap_msg->list);
		aq->pendingq_count--;
		ap_msg->rc = -EAGAIN;
		ap_msg->receive(aq, ap_msg, NULL);
	}
	list_for_each_entry_safe(ap_msg, next, &aq->requestq, list) {
		list_del_init(&ap_msg->list);
		aq->requestq_count--;
		ap_msg->rc = -EAGAIN;
		ap_msg->receive(aq, ap_msg, NULL);
	}
}

void ap_flush_queue(struct ap_queue *aq)
{
	spin_lock_bh(&aq->lock);
	__ap_flush_queue(aq);
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_flush_queue);

void ap_queue_remove(struct ap_queue *aq)
{
	ap_flush_queue(aq);
	del_timer_sync(&aq->timeout);
}
EXPORT_SYMBOL(ap_queue_remove);