162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci#ifndef _SCSI_SCSI_TCQ_H 362306a36Sopenharmony_ci#define _SCSI_SCSI_TCQ_H 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <linux/blkdev.h> 662306a36Sopenharmony_ci#include <scsi/scsi_cmnd.h> 762306a36Sopenharmony_ci#include <scsi/scsi_device.h> 862306a36Sopenharmony_ci#include <scsi/scsi_host.h> 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci#define SCSI_NO_TAG (-1) /* identify no tag in use */ 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci#ifdef CONFIG_BLOCK 1462306a36Sopenharmony_ci/** 1562306a36Sopenharmony_ci * scsi_host_find_tag - find the tagged command by host 1662306a36Sopenharmony_ci * @shost: pointer to scsi_host 1762306a36Sopenharmony_ci * @tag: tag 1862306a36Sopenharmony_ci * 1962306a36Sopenharmony_ci * Note: for devices using multiple hardware queues tag must have been 2062306a36Sopenharmony_ci * generated by blk_mq_unique_tag(). 2162306a36Sopenharmony_ci **/ 2262306a36Sopenharmony_cistatic inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, 2362306a36Sopenharmony_ci int tag) 2462306a36Sopenharmony_ci{ 2562306a36Sopenharmony_ci struct request *req = NULL; 2662306a36Sopenharmony_ci u16 hwq; 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ci if (tag == SCSI_NO_TAG) 2962306a36Sopenharmony_ci return NULL; 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_ci hwq = blk_mq_unique_tag_to_hwq(tag); 3262306a36Sopenharmony_ci if (hwq < shost->tag_set.nr_hw_queues) { 3362306a36Sopenharmony_ci req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq], 3462306a36Sopenharmony_ci blk_mq_unique_tag_to_tag(tag)); 3562306a36Sopenharmony_ci } 3662306a36Sopenharmony_ci 3762306a36Sopenharmony_ci if (!req || !blk_mq_request_started(req)) 3862306a36Sopenharmony_ci return NULL; 3962306a36Sopenharmony_ci return blk_mq_rq_to_pdu(req); 4062306a36Sopenharmony_ci} 4162306a36Sopenharmony_ci 4262306a36Sopenharmony_ci#endif /* CONFIG_BLOCK */ 4362306a36Sopenharmony_ci#endif /* _SCSI_SCSI_TCQ_H */ 44