44 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _SCSI_SCSI_TCQ_H3#define _SCSI_SCSI_TCQ_H4 5#include <linux/blkdev.h>6#include <scsi/scsi_cmnd.h>7#include <scsi/scsi_device.h>8#include <scsi/scsi_host.h>9 10#define SCSI_NO_TAG (-1) /* identify no tag in use */11 12 13#ifdef CONFIG_BLOCK14/**15 * scsi_host_find_tag - find the tagged command by host16 * @shost: pointer to scsi_host17 * @tag: tag18 *19 * Note: for devices using multiple hardware queues tag must have been20 * generated by blk_mq_unique_tag().21 **/22static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,23 int tag)24{25 struct request *req = NULL;26 u16 hwq;27 28 if (tag == SCSI_NO_TAG)29 return NULL;30 31 hwq = blk_mq_unique_tag_to_hwq(tag);32 if (hwq < shost->tag_set.nr_hw_queues) {33 req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq],34 blk_mq_unique_tag_to_tag(tag));35 }36 37 if (!req || !blk_mq_request_started(req))38 return NULL;39 return blk_mq_rq_to_pdu(req);40}41 42#endif /* CONFIG_BLOCK */43#endif /* _SCSI_SCSI_TCQ_H */44