Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * SCSI library functions depending on DMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <scsi/scsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <scsi/scsi_cmnd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <scsi/scsi_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <scsi/scsi_host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * scsi_dma_map - perform DMA mapping against command's sg lists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * @cmd:	scsi command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * Returns the number of sg lists actually used, zero if the sg lists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * is NULL, or -ENOMEM if the mapping failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int scsi_dma_map(struct scsi_cmnd *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	int nseg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (scsi_sg_count(cmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		struct device *dev = cmd->device->host->dma_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 				  cmd->sc_data_direction);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		if (unlikely(!nseg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	return nseg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) EXPORT_SYMBOL(scsi_dma_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  * @cmd:	scsi command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) void scsi_dma_unmap(struct scsi_cmnd *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	if (scsi_sg_count(cmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		struct device *dev = cmd->device->host->dma_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 			     cmd->sc_data_direction);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) EXPORT_SYMBOL(scsi_dma_unmap);