mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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17a941d854
AK: I hacked Muli's original patch a lot and there were a lot
of changes - all bugs are probably to blame on me now.
There were also some changes in the fall back behaviour
for swiotlb - in particular it doesn't try to use GFP_DMA
now anymore. Also all DMA mapping operations use the
same core dma_alloc_coherent code with proper fallbacks now.
And various other changes and cleanups.
Known problems: iommu=force swiotlb=force together breaks
needs more testing.
This patch cleans up x86_64's DMA mapping dispatching code. Right now
we have three possible IOMMU types: AGP GART, swiotlb and nommu, and
in the future we will also have Xen's x86_64 swiotlb and other HW
IOMMUs for x86_64. In order to support all of them cleanly, this
patch:
- introduces a struct dma_mapping_ops with function pointers for each
of the DMA mapping operations of gart (AMD HW IOMMU), swiotlb
(software IOMMU) and nommu (no IOMMU).
- gets rid of:
if (swiotlb)
return swiotlb_xxx();
- PCI_DMA_BUS_IS_PHYS is now checked against the dma_ops being set
This makes swiotlb faster by avoiding double copying in some cases.
Signed-Off-By: Muli Ben-Yehuda <mulix@mulix.org>
Signed-Off-By: Jon D. Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
#ifndef _ASM_SWIOTLB_H
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#define _ASM_SWTIOLB_H 1
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#include <linux/config.h>
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#include <asm/dma-mapping.h>
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/* SWIOTLB interface */
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extern dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr,
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size_t size, int dir);
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extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags);
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extern void swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, int dir);
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extern void swiotlb_sync_single_for_cpu(struct device *hwdev,
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dma_addr_t dev_addr,
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size_t size, int dir);
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extern void swiotlb_sync_single_for_device(struct device *hwdev,
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dma_addr_t dev_addr,
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size_t size, int dir);
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extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
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dma_addr_t dev_addr,
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unsigned long offset,
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size_t size, int dir);
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extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
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dma_addr_t dev_addr,
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unsigned long offset,
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size_t size, int dir);
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extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
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struct scatterlist *sg, int nelems,
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int dir);
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extern void swiotlb_sync_sg_for_device(struct device *hwdev,
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struct scatterlist *sg, int nelems,
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int dir);
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extern int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg,
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int nents, int direction);
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extern void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg,
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int nents, int direction);
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extern int swiotlb_dma_mapping_error(dma_addr_t dma_addr);
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extern void swiotlb_free_coherent (struct device *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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extern int swiotlb_dma_supported(struct device *hwdev, u64 mask);
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extern void swiotlb_init(void);
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#ifdef CONFIG_SWIOTLB
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extern int swiotlb;
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#else
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#define swiotlb 0
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#endif
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extern void pci_swiotlb_init(void);
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#endif /* _ASM_SWTIOLB_H */
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