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43 lines
993 B
43 lines
993 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _SCSI_SCSI_TCQ_H |
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#define _SCSI_SCSI_TCQ_H |
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#include <linux/blkdev.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#define SCSI_NO_TAG (-1) /* identify no tag in use */ |
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#ifdef CONFIG_BLOCK |
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/** |
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* scsi_host_find_tag - find the tagged command by host |
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* @shost: pointer to scsi_host |
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* @tag: tag |
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* |
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* Note: for devices using multiple hardware queues tag must have been |
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* generated by blk_mq_unique_tag(). |
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**/ |
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static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, |
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int tag) |
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{ |
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struct request *req = NULL; |
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u16 hwq; |
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if (tag == SCSI_NO_TAG) |
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return NULL; |
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hwq = blk_mq_unique_tag_to_hwq(tag); |
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if (hwq < shost->tag_set.nr_hw_queues) { |
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req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq], |
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blk_mq_unique_tag_to_tag(tag)); |
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} |
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if (!req || !blk_mq_request_started(req)) |
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return NULL; |
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return blk_mq_rq_to_pdu(req); |
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} |
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#endif /* CONFIG_BLOCK */ |
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#endif /* _SCSI_SCSI_TCQ_H */
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