linux/include/linux/bsg-lib.h
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   1/*
   2 *  BSG helper library
   3 *
   4 *  Copyright (C) 2008   James Smart, Emulex Corporation
   5 *  Copyright (C) 2011   Red Hat, Inc.  All rights reserved.
   6 *  Copyright (C) 2011   Mike Christie
   7 *
   8 *  This program is free software; you can redistribute it and/or modify
   9 *  it under the terms of the GNU General Public License as published by
  10 *  the Free Software Foundation; either version 2 of the License, or
  11 *  (at your option) any later version.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 *
  22 */
  23#ifndef _BLK_BSG_
  24#define _BLK_BSG_
  25
  26#include <linux/blkdev.h>
  27
  28struct request;
  29struct device;
  30struct scatterlist;
  31struct request_queue;
  32
  33struct bsg_buffer {
  34        unsigned int payload_len;
  35        int sg_cnt;
  36        struct scatterlist *sg_list;
  37};
  38
  39struct bsg_job {
  40        struct device *dev;
  41        struct request *req;
  42
  43        /* Transport/driver specific request/reply structs */
  44        void *request;
  45        void *reply;
  46
  47        unsigned int request_len;
  48        unsigned int reply_len;
  49        /*
  50         * On entry : reply_len indicates the buffer size allocated for
  51         * the reply.
  52         *
  53         * Upon completion : the message handler must set reply_len
  54         *  to indicates the size of the reply to be returned to the
  55         *  caller.
  56         */
  57
  58        /* DMA payloads for the request/response */
  59        struct bsg_buffer request_payload;
  60        struct bsg_buffer reply_payload;
  61
  62        void *dd_data;          /* Used for driver-specific storage */
  63};
  64
  65void bsg_job_done(struct bsg_job *job, int result,
  66                  unsigned int reply_payload_rcv_len);
  67int bsg_setup_queue(struct device *dev, struct request_queue *q, char *name,
  68                    bsg_job_fn *job_fn, int dd_job_size);
  69void bsg_request_fn(struct request_queue *q);
  70
  71#endif
  72
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