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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>
- struct bsg_job;
- 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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