1 #ifndef _SCSI_SCSI_TCQ_H 2 #define _SCSI_SCSI_TCQ_H 3 4 #include <linux/blkdev.h> 5 #include <scsi/scsi_cmnd.h> 6 #include <scsi/scsi_device.h> 7 #include <scsi/scsi_host.h> 8 9 #define SCSI_NO_TAG (-1) /* identify no tag in use */ 10 11 12 #ifdef CONFIG_BLOCK 13 /** 14 * scsi_host_find_tag - find the tagged command by host 15 * @shost: pointer to scsi_host 16 * @tag: tag 17 * 18 * Note: for devices using multiple hardware queues tag must have been 19 * generated by blk_mq_unique_tag(). 20 **/ 21 static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, 22 int tag) 23 { 24 struct request *req = NULL; 25 26 if (tag == SCSI_NO_TAG) 27 return NULL; 28 29 if (shost_use_blk_mq(shost)) { 30 u16 hwq = blk_mq_unique_tag_to_hwq(tag); 31 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 } else { 37 req = blk_map_queue_find_tag(shost->bqt, tag); 38 } 39 40 if (!req) 41 return NULL; 42 return req->special; 43 } 44 45 #endif /* CONFIG_BLOCK */ 46 #endif /* _SCSI_SCSI_TCQ_H */ 47