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Linux/include/linux/bsg-lib.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  *  BSG helper library
  4  *
  5  *  Copyright (C) 2008   James Smart, Emulex Corporation
  6  *  Copyright (C) 2011   Red Hat, Inc.  All rights reserved.
  7  *  Copyright (C) 2011   Mike Christie
  8  */
  9 #ifndef _BLK_BSG_
 10 #define _BLK_BSG_
 11 
 12 #include <linux/blkdev.h>
 13 #include <scsi/scsi_request.h>
 14 
 15 struct request;
 16 struct device;
 17 struct scatterlist;
 18 struct request_queue;
 19 
 20 typedef int (bsg_job_fn) (struct bsg_job *);
 21 typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *);
 22 
 23 struct bsg_buffer {
 24         unsigned int payload_len;
 25         int sg_cnt;
 26         struct scatterlist *sg_list;
 27 };
 28 
 29 struct bsg_job {
 30         struct device *dev;
 31 
 32         struct kref kref;
 33 
 34         unsigned int timeout;
 35 
 36         /* Transport/driver specific request/reply structs */
 37         void *request;
 38         void *reply;
 39 
 40         unsigned int request_len;
 41         unsigned int reply_len;
 42         /*
 43          * On entry : reply_len indicates the buffer size allocated for
 44          * the reply.
 45          *
 46          * Upon completion : the message handler must set reply_len
 47          *  to indicates the size of the reply to be returned to the
 48          *  caller.
 49          */
 50 
 51         /* DMA payloads for the request/response */
 52         struct bsg_buffer request_payload;
 53         struct bsg_buffer reply_payload;
 54 
 55         int result;
 56         unsigned int reply_payload_rcv_len;
 57 
 58         /* BIDI support */
 59         struct request *bidi_rq;
 60         struct bio *bidi_bio;
 61 
 62         void *dd_data;          /* Used for driver-specific storage */
 63 };
 64 
 65 void bsg_job_done(struct bsg_job *job, int result,
 66                   unsigned int reply_payload_rcv_len);
 67 struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
 68                 bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size);
 69 void bsg_remove_queue(struct request_queue *q);
 70 void bsg_job_put(struct bsg_job *job);
 71 int __must_check bsg_job_get(struct bsg_job *job);
 72 
 73 #endif
 74 

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