1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SCSI_SCSI_TCQ_H 3 #define _SCSI_SCSI_TCQ_H 4 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_BLOCK 14 /** 15 * scsi_host_find_tag - find the tagged command by host 16 * @shost: pointer to scsi_host 17 * @tag: tag 18 * 19 * Note: for devices using multiple hardware queues tag must have been 20 * generated by blk_mq_unique_tag(). 21 **/ 22 static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, 23 int tag) 24 { 25 struct request *req = NULL; 26 27 if (tag == SCSI_NO_TAG) 28 return NULL; 29 30 if (shost_use_blk_mq(shost)) { 31 u16 hwq = blk_mq_unique_tag_to_hwq(tag); 32 33 if (hwq < shost->tag_set.nr_hw_queues) { 34 req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq], 35 blk_mq_unique_tag_to_tag(tag)); 36 } 37 } else { 38 req = blk_map_queue_find_tag(shost->bqt, tag); 39 } 40 41 if (!req) 42 return NULL; 43 return blk_mq_rq_to_pdu(req); 44 } 45 46 #endif /* CONFIG_BLOCK */ 47 #endif /* _SCSI_SCSI_TCQ_H */ 48