/* 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 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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