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74 lines
1.7 KiB
74 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* BSG helper library |
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* |
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* Copyright (C) 2008 James Smart, Emulex Corporation |
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* Copyright (C) 2011 Red Hat, Inc. All rights reserved. |
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* Copyright (C) 2011 Mike Christie |
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*/ |
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#ifndef _BLK_BSG_ |
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#define _BLK_BSG_ |
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#include <linux/blkdev.h> |
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#include <scsi/scsi_request.h> |
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struct bsg_job; |
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struct request; |
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struct device; |
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struct scatterlist; |
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struct request_queue; |
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typedef int (bsg_job_fn) (struct bsg_job *); |
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typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *); |
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struct bsg_buffer { |
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unsigned int payload_len; |
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int sg_cnt; |
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struct scatterlist *sg_list; |
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}; |
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struct bsg_job { |
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struct device *dev; |
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struct kref kref; |
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unsigned int timeout; |
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/* Transport/driver specific request/reply structs */ |
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void *request; |
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void *reply; |
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unsigned int request_len; |
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unsigned int reply_len; |
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/* |
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* On entry : reply_len indicates the buffer size allocated for |
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* the reply. |
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* |
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* Upon completion : the message handler must set reply_len |
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* to indicates the size of the reply to be returned to the |
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* caller. |
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*/ |
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/* DMA payloads for the request/response */ |
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struct bsg_buffer request_payload; |
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struct bsg_buffer reply_payload; |
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int result; |
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unsigned int reply_payload_rcv_len; |
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/* BIDI support */ |
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struct request *bidi_rq; |
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struct bio *bidi_bio; |
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void *dd_data; /* Used for driver-specific storage */ |
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}; |
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void bsg_job_done(struct bsg_job *job, int result, |
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unsigned int reply_payload_rcv_len); |
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struct request_queue *bsg_setup_queue(struct device *dev, const char *name, |
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bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size); |
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void bsg_remove_queue(struct request_queue *q); |
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void bsg_job_put(struct bsg_job *job); |
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int __must_check bsg_job_get(struct bsg_job *job); |
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#endif
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