2 * SCSI library functions depending on DMA
5 #include <linux/blkdev.h>
6 #include <linux/device.h>
7 #include <linux/export.h>
8 #include <linux/kernel.h>
10 #include <scsi/scsi.h>
11 #include <scsi/scsi_cmnd.h>
12 #include <scsi/scsi_device.h>
13 #include <scsi/scsi_host.h>
16 * scsi_dma_map - perform DMA mapping against command's sg lists
19 * Returns the number of sg lists actually used, zero if the sg lists
20 * is NULL, or -ENOMEM if the mapping failed.
22 int scsi_dma_map(struct scsi_cmnd
*cmd
)
26 if (scsi_sg_count(cmd
)) {
27 struct device
*dev
= cmd
->device
->host
->dma_dev
;
29 nseg
= dma_map_sg(dev
, scsi_sglist(cmd
), scsi_sg_count(cmd
),
30 cmd
->sc_data_direction
);
36 EXPORT_SYMBOL(scsi_dma_map
);
39 * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
42 void scsi_dma_unmap(struct scsi_cmnd
*cmd
)
44 if (scsi_sg_count(cmd
)) {
45 struct device
*dev
= cmd
->device
->host
->dma_dev
;
47 dma_unmap_sg(dev
, scsi_sglist(cmd
), scsi_sg_count(cmd
),
48 cmd
->sc_data_direction
);
51 EXPORT_SYMBOL(scsi_dma_unmap
);
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