Release 4.14 drivers/scsi/scsi_lib_dma.c

// SPDX-License-Identifier: GPL-2.0
/*
 * SCSI library functions depending on DMA
 */

#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/kernel.h>

#include <scsi/scsi.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
 * @cmd:        scsi command
 *
 * 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)
{
	int nseg = 0;

	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),
				  cmd->sc_data_direction);
		if (unlikely(!nseg))
			return -ENOMEM;
	}
	return nseg;
}
Contributors
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CommitProp
Cornelia Huck
72
98.63%
1
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James Bottomley
1
1.37%
1
50.00%
Total
73
100.00%
2
100.00%


EXPORT_SYMBOL(scsi_dma_map);

/**
 * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
 * @cmd:        scsi command
 */


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),
			     cmd->sc_data_direction);
	}
}
Contributors
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Cornelia Huck
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James Bottomley
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Total
51
100.00%
2
100.00%


EXPORT_SYMBOL(scsi_dma_unmap);
Overall Contributors
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Tokens
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CommitProp
Cornelia Huck
156
96.30%
1
25.00%
Paul Gortmaker
3
1.85%
1
25.00%
James Bottomley
2
1.23%
1
25.00%
Greg Kroah-Hartman
1
0.62%
1
25.00%
Total
162
100.00%
4
100.00%
Directory: drivers/scsi

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