]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/scsi/scsi_lib_dma.c
1 // SPDX-License-Identifier: GPL-2.0
3 * SCSI library functions depending on DMA
6 #include <linux/blkdev.h>
7 #include <linux/device.h>
8 #include <linux/export.h>
9 #include <linux/kernel.h>
11 #include <scsi/scsi.h>
12 #include <scsi/scsi_cmnd.h>
13 #include <scsi/scsi_device.h>
14 #include <scsi/scsi_host.h>
17 * scsi_dma_map - perform DMA mapping against command's sg lists
20 * Returns the number of sg lists actually used, zero if the sg lists
21 * is NULL, or -ENOMEM if the mapping failed.
23 int scsi_dma_map(struct scsi_cmnd
*cmd
)
27 if (scsi_sg_count(cmd
)) {
28 struct device
*dev
= cmd
->device
->host
->dma_dev
;
30 nseg
= dma_map_sg(dev
, scsi_sglist(cmd
), scsi_sg_count(cmd
),
31 cmd
->sc_data_direction
);
37 EXPORT_SYMBOL(scsi_dma_map
);
40 * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
43 void scsi_dma_unmap(struct scsi_cmnd
*cmd
)
45 if (scsi_sg_count(cmd
)) {
46 struct device
*dev
= cmd
->device
->host
->dma_dev
;
48 dma_unmap_sg(dev
, scsi_sglist(cmd
), scsi_sg_count(cmd
),
49 cmd
->sc_data_direction
);
52 EXPORT_SYMBOL(scsi_dma_unmap
);