linux-imx

/*

 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.

 *

 * This file is released under the GPL.

 */

​

#include "dm-core.h"

#include "dm-rq.h"

​

#include <linux/elevator.h> /* for rq_end_sector() */

#include <linux/blk-mq.h>

​

#define DM_MSG_PREFIX "core-rq"

​

/*

 * One of these is allocated per request.

 */

struct dm_rq_target_io {

    struct mapped_device *md;

    struct dm_target *ti;

    struct request *orig, *clone;

    struct kthread_work work;

    blk_status_t error;

    union map_info info;

    struct dm_stats_aux stats_aux;

    unsigned long duration_jiffies;

    unsigned n_sectors;

    unsigned completed;

};

​

#define DM_MQ_NR_HW_QUEUES 1

#define DM_MQ_QUEUE_DEPTH 2048

static unsigned dm_mq_nr_hw_queues = DM_MQ_NR_HW_QUEUES;

static unsigned dm_mq_queue_depth = DM_MQ_QUEUE_DEPTH;

​

/*

 * Request-based DM's mempools' reserved IOs set by the user.

 */

#define RESERVED_REQUEST_BASED_IOS  256

static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS;

​

unsigned dm_get_reserved_rq_based_ios(void)

{

    return __dm_get_module_param(&reserved_rq_based_ios,

                     RESERVED_REQUEST_BASED_IOS, DM_RESERVED_MAX_IOS);

}

EXPORT_SYMBOL_GPL(dm_get_reserved_rq_based_ios);

​

static unsigned dm_get_blk_mq_nr_hw_queues(void)

{

    return __dm_get_module_param(&dm_mq_nr_hw_queues, 1, 32);

}

​

static unsigned dm_get_blk_mq_queue_depth(void)

{

    return __dm_get_module_param(&dm_mq_queue_depth,

                     DM_MQ_QUEUE_DEPTH, BLK_MQ_MAX_DEPTH);

}

​

int dm_request_based(struct mapped_device *md)

{

    return queue_is_mq(md->queue);

}