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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)
return NULL;
return blk_mq_rq_to_pdu(req);
}
#endif /* CONFIG_BLOCK */
#endif /* _SCSI_SCSI_TCQ_H */