| * SCSI library functions depending on DMA |
| #include <linux/blkdev.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_host.h> |
| * scsi_dma_map - perform DMA mapping against command's sg lists |
| * Returns the number of sg lists actually used, zero if the sg lists |
| * is NULL, or -ENOMEM if the mapping failed. |
| int scsi_dma_map(struct scsi_cmnd *cmd) |
| if (scsi_sg_count(cmd)) { |
| struct device *dev = cmd->device->host->dma_dev; |
| nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd), |
| EXPORT_SYMBOL(scsi_dma_map); |
| * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map |
| void scsi_dma_unmap(struct scsi_cmnd *cmd) |
| if (scsi_sg_count(cmd)) { |
| struct device *dev = cmd->device->host->dma_dev; |
| dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd), |
| EXPORT_SYMBOL(scsi_dma_unmap); |