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x86/dma: Use DMA-direct (CONFIG_DMA_DIRECT_OPS=y)

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The generic DMA-direct (CONFIG_DMA_DIRECT_OPS=y) implementation is now
functionally equivalent to the x86 nommu dma_map implementation, so
switch over to using it.

That includes switching from using x86_dma_supported in various IOMMU
drivers to use dma_direct_supported instead, which provides the same
functionality.

Tested-by: Tom Lendacky <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Jon Mason <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Muli Ben-Yehuda <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Christoph Hellwig 2018-03-19 11:38:15 +01:00 • committed by Ingo Molnar
commit fec777c385
11 changed files with 17 additions and 90 deletions
Download patch file Download diff file Expand all files Collapse all files

7
drivers/iommu/amd_iommu.c
View file

@ -28,6 +28,7 @@
#include <linux/debugfs.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h>
#include <linux/iommu-helper.h>
#include <linux/iommu.h>
#include <linux/delay.h>
@ -2193,7 +2194,7 @@ static int amd_iommu_add_device(struct device *dev)
dev_name(dev));
iommu_ignore_device(dev);
dev->dma_ops = &nommu_dma_ops;
dev->dma_ops = &dma_direct_ops;
goto out;
}
init_iommu_group(dev);
@ -2680,7 +2681,7 @@ free_mem:
*/
static int amd_iommu_dma_supported(struct device *dev, u64 mask)
{
if (!x86_dma_supported(dev, mask))
if (!dma_direct_supported(dev, mask))
return 0;
return check_device(dev);
}
@ -2794,7 +2795,7 @@ int __init amd_iommu_init_dma_ops(void)
* continue to be SWIOTLB.
*/
if (!swiotlb)
dma_ops = &nommu_dma_ops;
dma_ops = &dma_direct_ops;
if (amd_iommu_unmap_flush)
pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n");

3
drivers/iommu/intel-iommu.c
View file

@ -45,6 +45,7 @@
#include <linux/pci-ats.h>
#include <linux/memblock.h>
#include <linux/dma-contiguous.h>
#include <linux/dma-direct.h>
#include <linux/crash_dump.h>
#include <asm/irq_remapping.h>
#include <asm/cacheflush.h>
@ -3871,7 +3872,7 @@ const struct dma_map_ops intel_dma_ops = {
.unmap_page = intel_unmap_page,
.mapping_error = intel_mapping_error,
#ifdef CONFIG_X86
.dma_supported = x86_dma_supported,
.dma_supported = dma_direct_supported,
#endif
};