scsi_tcq.rar_Only

#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 static inline struct scsi_cmnd *scsi_mq_find_tag(struct Scsi_Host *shost, int unique_tag) { u16 hwq = blk_mq_unique_tag_to_hwq(unique_tag); struct request *req = NULL; 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(unique_tag)); return req ? (struct scsi_cmnd *)req->special : NULL; } /** * scsi_find_tag - find a tagged command by device * @SDpnt: pointer to the ScSI device * @tag: tag generated by blk_mq_unique_tag() * * Notes: * Only works with tags allocated by the generic blk layer. **/ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag) { struct request *req; if (tag != SCSI_NO_TAG) { if (shost_use_blk_mq(sdev->host)) return scsi_mq_find_tag(sdev->host, tag); req = blk_queue_find_tag(sdev->request_queue, tag); return req ? (struct scsi_cmnd *)req->special : NULL; } /* single command, look in space */ return sdev->current_cmnd; } /** * scsi_init_shared_tag_map - create a shared tag map * @shost: the host to share the tag map among all devices * @depth: the total depth of the map */ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth) { /* * We always have a shared tag map around when using blk-mq. */ if (shost_use_blk_mq(shost)) return 0; /* * If the shared tag map isn't already initialized, do it now. * This saves callers from having to check ->bqt when setting up * devices on the shared host (for libata) */ if (!shost->bqt) { shost->bqt = blk_init_tags(depth); if (!shost->bqt) return -ENOMEM; } return 0; } /** * scsi_host_find_tag - find the tagged command by host * @shost: pointer to scsi_host * @tag: tag generated by blk_mq_unique_tag() * * Notes: * Only works with tags allocated by the generic blk layer. **/ static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, int tag) { struct request *req; if (tag != SCSI_NO_TAG) { if (shost_use_blk_mq(shost)) return scsi_mq_find_tag(shost, tag); req = blk_map_queue_find_tag(shost->bqt, tag); return req ? (struct scsi_cmnd *)req->special : NULL; } return NULL; } #endif /* CONFIG_BLOCK */ #endif /* _SCSI_SCSI_TCQ_H */