1/*
 2 * SCSI library functions depending on DMA
 3 */
 4
 5#include <linux/blkdev.h>
 6#include <linux/device.h>
 
 7#include <linux/kernel.h>
 8
 9#include <scsi/scsi.h>
10#include <scsi/scsi_cmnd.h>
11#include <scsi/scsi_device.h>
12#include <scsi/scsi_host.h>
13
14/**
15 * scsi_dma_map - perform DMA mapping against command's sg lists
16 * @cmd:	scsi command
17 *
18 * Returns the number of sg lists actually used, zero if the sg lists
19 * is NULL, or -ENOMEM if the mapping failed.
20 */
21int scsi_dma_map(struct scsi_cmnd *cmd)
22{
23	int nseg = 0;
24
25	if (scsi_sg_count(cmd)) {
26		struct device *dev = cmd->device->host->dma_dev;
27
28		nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
29				  cmd->sc_data_direction);
30		if (unlikely(!nseg))
31			return -ENOMEM;
32	}
33	return nseg;
34}
35EXPORT_SYMBOL(scsi_dma_map);
36
37/**
38 * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
39 * @cmd:	scsi command
40 */
41void scsi_dma_unmap(struct scsi_cmnd *cmd)
42{
43	if (scsi_sg_count(cmd)) {
44		struct device *dev = cmd->device->host->dma_dev;
45
46		dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
47			     cmd->sc_data_direction);
48	}
49}
50EXPORT_SYMBOL(scsi_dma_unmap);

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * SCSI library functions depending on DMA
 4 */
 5
 6#include <linux/blkdev.h>
 7#include <linux/device.h>
 8#include <linux/export.h>
 9#include <linux/kernel.h>
10
11#include <scsi/scsi.h>
12#include <scsi/scsi_cmnd.h>
13#include <scsi/scsi_device.h>
14#include <scsi/scsi_host.h>
15
16/**
17 * scsi_dma_map - perform DMA mapping against command's sg lists
18 * @cmd:	scsi command
19 *
20 * Returns the number of sg lists actually used, zero if the sg lists
21 * is NULL, or -ENOMEM if the mapping failed.
22 */
23int scsi_dma_map(struct scsi_cmnd *cmd)
24{
25	int nseg = 0;
26
27	if (scsi_sg_count(cmd)) {
28		struct device *dev = cmd->device->host->dma_dev;
29
30		nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
31				  cmd->sc_data_direction);
32		if (unlikely(!nseg))
33			return -ENOMEM;
34	}
35	return nseg;
36}
37EXPORT_SYMBOL(scsi_dma_map);
38
39/**
40 * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
41 * @cmd:	scsi command
42 */
43void scsi_dma_unmap(struct scsi_cmnd *cmd)
44{
45	if (scsi_sg_count(cmd)) {
46		struct device *dev = cmd->device->host->dma_dev;
47
48		dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
49			     cmd->sc_data_direction);
50	}
51}
52EXPORT_SYMBOL(scsi_dma_unmap);