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https://github.com/FEX-Emu/linux.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>
188 lines
5.6 KiB
C
188 lines
5.6 KiB
C
#ifndef _X8664_DMA_MAPPING_H
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#define _X8664_DMA_MAPPING_H 1
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/*
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* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
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* documentation.
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*/
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#include <linux/config.h>
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#include <asm/scatterlist.h>
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#include <asm/io.h>
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#include <asm/swiotlb.h>
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struct dma_mapping_ops {
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int (*mapping_error)(dma_addr_t dma_addr);
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void* (*alloc_coherent)(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp);
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void (*free_coherent)(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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dma_addr_t (*map_single)(struct device *hwdev, void *ptr,
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size_t size, int direction);
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/* like map_single, but doesn't check the device mask */
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dma_addr_t (*map_simple)(struct device *hwdev, char *ptr,
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size_t size, int direction);
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void (*unmap_single)(struct device *dev, dma_addr_t addr,
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size_t size, int direction);
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void (*sync_single_for_cpu)(struct device *hwdev,
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dma_addr_t dma_handle, size_t size,
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int direction);
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void (*sync_single_for_device)(struct device *hwdev,
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dma_addr_t dma_handle, size_t size,
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int direction);
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void (*sync_single_range_for_cpu)(struct device *hwdev,
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dma_addr_t dma_handle, unsigned long offset,
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size_t size, int direction);
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void (*sync_single_range_for_device)(struct device *hwdev,
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dma_addr_t dma_handle, unsigned long offset,
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size_t size, int direction);
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void (*sync_sg_for_cpu)(struct device *hwdev,
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struct scatterlist *sg, int nelems,
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int direction);
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void (*sync_sg_for_device)(struct device *hwdev,
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struct scatterlist *sg, int nelems,
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int direction);
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int (*map_sg)(struct device *hwdev, struct scatterlist *sg,
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int nents, int direction);
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void (*unmap_sg)(struct device *hwdev,
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struct scatterlist *sg, int nents,
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int direction);
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int (*dma_supported)(struct device *hwdev, u64 mask);
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int is_phys;
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};
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extern dma_addr_t bad_dma_address;
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extern struct dma_mapping_ops* dma_ops;
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extern int iommu_merge;
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static inline int dma_mapping_error(dma_addr_t dma_addr)
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{
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if (dma_ops->mapping_error)
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return dma_ops->mapping_error(dma_addr);
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return (dma_addr == bad_dma_address);
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}
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extern void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp);
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extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle);
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static inline dma_addr_t
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dma_map_single(struct device *hwdev, void *ptr, size_t size,
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int direction)
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{
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return dma_ops->map_single(hwdev, ptr, size, direction);
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}
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
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int direction)
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{
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dma_ops->unmap_single(dev, addr, size, direction);
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}
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#define dma_map_page(dev,page,offset,size,dir) \
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dma_map_single((dev), page_address(page)+(offset), (size), (dir))
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#define dma_unmap_page dma_unmap_single
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static inline void
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dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
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size_t size, int direction)
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{
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if (dma_ops->sync_single_for_cpu)
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dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
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direction);
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flush_write_buffers();
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}
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static inline void
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dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
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size_t size, int direction)
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{
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if (dma_ops->sync_single_for_device)
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dma_ops->sync_single_for_device(hwdev, dma_handle, size,
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direction);
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flush_write_buffers();
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}
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static inline void
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dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
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unsigned long offset, size_t size, int direction)
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{
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if (dma_ops->sync_single_range_for_cpu) {
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dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
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}
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flush_write_buffers();
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}
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static inline void
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dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
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unsigned long offset, size_t size, int direction)
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{
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if (dma_ops->sync_single_range_for_device)
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dma_ops->sync_single_range_for_device(hwdev, dma_handle,
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offset, size, direction);
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flush_write_buffers();
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
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int nelems, int direction)
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{
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if (dma_ops->sync_sg_for_cpu)
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dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
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flush_write_buffers();
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}
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static inline void
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dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
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int nelems, int direction)
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{
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if (dma_ops->sync_sg_for_device) {
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dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
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}
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flush_write_buffers();
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}
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static inline int
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dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
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{
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return dma_ops->map_sg(hwdev, sg, nents, direction);
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}
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static inline void
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dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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int direction)
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{
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dma_ops->unmap_sg(hwdev, sg, nents, direction);
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}
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extern int dma_supported(struct device *hwdev, u64 mask);
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/* same for gart, swiotlb, and nommu */
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static inline int dma_get_cache_alignment(void)
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{
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return boot_cpu_data.x86_clflush_size;
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}
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#define dma_is_consistent(h) 1
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extern int dma_set_mask(struct device *dev, u64 mask);
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static inline void
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dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
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{
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flush_write_buffers();
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}
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extern struct device fallback_dev;
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extern int panic_on_overflow;
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#endif /* _X8664_DMA_MAPPING_H */
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