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 28 struct request; 29 struct device; 30 struct scatterlist; 31 struct request_queue; 32 33 struct bsg_buffer { 34 unsigned int payload_len; 35 int sg_cnt; 36 struct scatterlist *sg_list; 37 }; 38 39 struct 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 65 void bsg_job_done(struct bsg_job *job, int result, 66 unsigned int reply_payload_rcv_len); 67 int bsg_setup_queue(struct device *dev, struct request_queue *q, char *name, 68 bsg_job_fn *job_fn, int dd_job_size); 69 void bsg_request_fn(struct request_queue *q); 70 void bsg_remove_queue(struct request_queue *q); 71 void bsg_goose_queue(struct request_queue *q); 72 73 #endif 74