1 files changed, 73 insertions, 0 deletions
diff --git a/include/linux/bsg-lib.h b/include/linux/bsg-lib.h
new file mode 100644
index 000000000..960988d42
--- /dev/null
+++ b/include/linux/bsg-lib.h
@@ -0,0 +1,73 @@
+/* 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 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