| /* 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 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 |