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