#include <linux/blkdev.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
-
+#include <scsi/scsi_host.h>
#define MSG_SIMPLE_TAG 0x20
#define MSG_HEAD_TAG 0x21
#define SCSI_NO_TAG (-1) /* identify no tag in use */
+#ifdef CONFIG_BLOCK
/**
* scsi_get_tag_type - get the type of tag the device supports
return;
if (!blk_queue_tagged(sdev->request_queue))
- blk_queue_init_tags(sdev->request_queue, depth, NULL);
+ blk_queue_init_tags(sdev->request_queue, depth,
+ sdev->host->bqt);
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
}
struct scsi_device *sdev = cmd->device;
if (blk_rq_tagged(req)) {
- if (sdev->ordered_tags && req->flags & REQ_HARDBARRIER)
+ if (sdev->ordered_tags && req->cmd_flags & REQ_HARDBARRIER)
*msg++ = MSG_ORDERED_TAG;
else
*msg++ = MSG_SIMPLE_TAG;
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)
+{
+ shost->bqt = blk_init_tags(depth);
+ return shost->bqt ? 0 : -ENOMEM;
+}
+
+/**
+ * scsi_host_find_tag - find the tagged command by host
+ * @shost: pointer to scsi_host
+ * @tag: tag of the scsi_cmnd
+ *
+ * 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) {
+ 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 */