[deliverable/linux.git] / include / scsi / scsi_tcq.h

#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 MSG_SIMPLE_TAG	0x20
#define MSG_HEAD_TAG	0x21
#define MSG_ORDERED_TAG	0x22
#define MSG_ACA_TAG	0x24	/* unsupported */

#define SCSI_NO_TAG	(-1)    /* identify no tag in use */


#ifdef CONFIG_BLOCK

int scsi_change_queue_type(struct scsi_device *sdev, int tag_type);

/**
 * scsi_get_tag_type - get the type of tag the device supports
 * @sdev:	the scsi device
 */
static inline int scsi_get_tag_type(struct scsi_device *sdev)
{
	if (!sdev->tagged_supported)
		return 0;
	if (sdev->simple_tags)
		return MSG_SIMPLE_TAG;
	return 0;
}

static inline void scsi_set_tag_type(struct scsi_device *sdev, int tag)
{
	switch (tag) {
	case MSG_ORDERED_TAG:
	case MSG_SIMPLE_TAG:
		sdev->simple_tags = 1;
		break;
	case 0:
		/* fall through */
	default:
		sdev->simple_tags = 0;
		break;
	}
}

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 */
Commit	Line	Data
1da177e4 LT	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>
86e33a29	7	#include <scsi/scsi_host.h>
1da177e4	8
1da177e4 LT	9	#define MSG_SIMPLE_TAG 0x20
	10	#define MSG_HEAD_TAG 0x21
	11	#define MSG_ORDERED_TAG 0x22
e66ecd50	12	#define MSG_ACA_TAG 0x24 /* unsupported */
1da177e4 LT	13
	14	#define SCSI_NO_TAG (-1) /* identify no tag in use */
	15
	16
9361401e	17	#ifdef CONFIG_BLOCK
1da177e4	18
a62182f3 CH	19	int scsi_change_queue_type(struct scsi_device *sdev, int tag_type);
a62182f3 CH	20
1da177e4 LT	21	/**
	22	* scsi_get_tag_type - get the type of tag the device supports
	23	* @sdev: the scsi device
1da177e4 LT	24	*/
	25	static inline int scsi_get_tag_type(struct scsi_device *sdev)
	26	{
	27	if (!sdev->tagged_supported)
	28	return 0;
1da177e4 LT	29	if (sdev->simple_tags)
	30	return MSG_SIMPLE_TAG;
	31	return 0;
	32	}
	33
	34	static inline void scsi_set_tag_type(struct scsi_device *sdev, int tag)
	35	{
	36	switch (tag) {
	37	case MSG_ORDERED_TAG:
1da177e4 LT	38	case MSG_SIMPLE_TAG:
	39	sdev->simple_tags = 1;
	40	break;
	41	case 0:
	42	/* fall through */
	43	default:
1da177e4 LT	44	sdev->simple_tags = 0;
	45	break;
	46	}
	47	}
1da177e4	48
d285203c	49	static inline struct scsi_cmnd scsi_mq_find_tag(struct Scsi_Host shost,
1ee8e889	50	int unique_tag)
d285203c	51	{
1ee8e889 BVA	52	u16 hwq = blk_mq_unique_tag_to_hwq(unique_tag);
1ee8e889 BVA	53	struct request *req = NULL;
d285203c	54
1ee8e889 BVA	55	if (hwq < shost->tag_set.nr_hw_queues)
	56	req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq],
	57	blk_mq_unique_tag_to_tag(unique_tag));
d285203c CH	58	return req ? (struct scsi_cmnd *)req->special : NULL;
	59	}
	60
1da177e4 LT	61	/**
	62	* scsi_find_tag - find a tagged command by device
	63	* @SDpnt: pointer to the ScSI device
1ee8e889	64	* @tag: tag generated by blk_mq_unique_tag()
1da177e4 LT	65	*
	66	* Notes:
	67	* Only works with tags allocated by the generic blk layer.
	68	**/
	69	static inline struct scsi_cmnd scsi_find_tag(struct scsi_device sdev, int tag)
	70	{
1da177e4 LT	71	struct request *req;
	72
	73	if (tag != SCSI_NO_TAG) {
d285203c	74	if (shost_use_blk_mq(sdev->host))
1ee8e889	75	return scsi_mq_find_tag(sdev->host, tag);
d285203c	76
1ee8e889	77	req = blk_queue_find_tag(sdev->request_queue, tag);
1da177e4 LT	78	return req ? (struct scsi_cmnd *)req->special : NULL;
	79	}
	80
	81	/* single command, look in space */
	82	return sdev->current_cmnd;
	83	}
	84
d285203c	85
86e33a29 JB	86	/**
	87	* scsi_init_shared_tag_map - create a shared tag map
	88	* @shost: the host to share the tag map among all devices
	89	* @depth: the total depth of the map
	90	*/
deb81d80	91	static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
86e33a29	92	{
d285203c CH	93	/*
	94	* We always have a shared tag map around when using blk-mq.
	95	*/
	96	if (shost_use_blk_mq(shost))
	97	return 0;
	98
3070f69b JA	99	/*
	100	* If the shared tag map isn't already initialized, do it now.
	101	* This saves callers from having to check ->bqt when setting up
	102	* devices on the shared host (for libata)
	103	*/
	104	if (!shost->bqt) {
	105	shost->bqt = blk_init_tags(depth);
	106	if (!shost->bqt)
	107	return -ENOMEM;
	108	}
	109
	110	return 0;
86e33a29 JB	111	}
86e33a29 JB	112
f583f492 DS	113	/**
	114	* scsi_host_find_tag - find the tagged command by host
	115	* @shost: pointer to scsi_host
1ee8e889	116	* @tag: tag generated by blk_mq_unique_tag()
f583f492 DS	117	*
	118	* Notes:
	119	* Only works with tags allocated by the generic blk layer.
	120	**/
	121	static inline struct scsi_cmnd scsi_host_find_tag(struct Scsi_Host shost,
	122	int tag)
	123	{
	124	struct request *req;
	125
	126	if (tag != SCSI_NO_TAG) {
d285203c	127	if (shost_use_blk_mq(shost))
1ee8e889	128	return scsi_mq_find_tag(shost, tag);
f583f492 DS	129	req = blk_map_queue_find_tag(shost->bqt, tag);
	130	return req ? (struct scsi_cmnd *)req->special : NULL;
	131	}
	132	return NULL;
	133	}
	134
9361401e	135	#endif /* CONFIG_BLOCK */
1da177e4	136	#endif /* _SCSI_SCSI_TCQ_H */