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/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _SCSI_SCSI_TCQ_H

#define _SCSI_SCSI_TCQ_H

#include <linux/blkdev.h>

#include <scsi/scsi_cmnd.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_host.h>

#define SCSI_NO_TAG (-1) /* identify no tag in use */

#ifdef CONFIG_BLOCK

/**

* scsi_host_find_tag - find the tagged command by host

* @shost: pointer to scsi_host

* @tag: tag

*

* Note: for devices using multiple hardware queues tag must have been

* generated by blk_mq_unique_tag().

**/

static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,

int tag)

{

struct request *req = NULL;

u16 hwq;

if (tag == SCSI_NO_TAG)

return NULL;

hwq = blk_mq_unique_tag_to_hwq(tag);

if (hwq < shost->tag_set.nr_hw_queues) {

req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq],

blk_mq_unique_tag_to_tag(tag));

}

if (!req || !blk_mq_request_started(req))

return NULL;

return blk_mq_rq_to_pdu(req);

}

#endif /* CONFIG_BLOCK */

#endif /* _SCSI_SCSI_TCQ_H */