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