forked from Minki/linux
e37e0ee019
- turn dma_cache_sync into a dma_map_ops instance and remove implementation that purely are dead because the architecture doesn't support noncoherent allocations - add a flag for busses that need DMA configuration (Robin Murphy) -----BEGIN PGP SIGNATURE----- iQI/BAABCAApFiEEgdbnc3r/njty3Iq9D55TZVIEUYMFAloLSrYLHGhjaEBsc3Qu ZGUACgkQD55TZVIEUYOMuQ//XXD94uNPYavrgXzGsAtg+I+LEm+xyk4T0dX5fxfj amXX49MHoGemjsBgzJlkQMMFqwDEdkKyEuFnEuy6OeowYCyD6zW0MJ3MwP9OosNJ PNTdGZIfSvxPYEW8cR9AdK3iQ2loMBZnYhd+O/oVjSugULLW2DNa7r2VRktcCKoh 8Ob/8gL6Y9xEYJBRszhrBwKTa/hU8IThxxozBFzN7I3LIKyFboSTcwXGLAHow43g 4anCTjWTaDcoU2JwY6UTRKRRTV+gD0ZRcsZfd8lNNb5rtMVZkBVOHbF14SMAmw1r kSgRcU3+WIFPhK/8wBYqtGZZGnOgFBTHVeqow3AdS728pBWlWl8niTK0DiIgCd3m qzScF6SqfN1bCZkZAy8FUV2l0DPYKS6lvyNkf00Eb2W/f6LEqAcjCi2QDDxRfaw+ Vm97nPUiM+uXNy/6KtAy6ChdprSqx12/edXPp7Y3H2rS/+Dmr6exeix+wb7QUN8W JI7ZRHo4JLaJZk/XrZtGX/6jnN1Jo7vfApQOmYDY7kE1iGtOU/LQQj8gcZRVQxML 4soN6ivSmZX2k03LabWHpYQ8QiyCSYChLC+Az7rQH47LDLeu1IdTJu6orpXpaxyo ymzEWlHbmF7mE66X4g/Up/eAYk2YLUA3rKLGVjAIaWDBzHftSFg5EaAnqMADC1G2 hSo= =ALJf -----END PGP SIGNATURE----- Merge tag 'dma-mapping-4.15' of git://git.infradead.org/users/hch/dma-mapping Pull dma-mapping updates from Christoph Hellwig: - turn dma_cache_sync into a dma_map_ops instance and remove implementation that purely are dead because the architecture doesn't support noncoherent allocations - add a flag for busses that need DMA configuration (Robin Murphy) * tag 'dma-mapping-4.15' of git://git.infradead.org/users/hch/dma-mapping: dma-mapping: turn dma_cache_sync into a dma_map_ops method sh: make dma_cache_sync a no-op xtensa: make dma_cache_sync a no-op unicore32: make dma_cache_sync a no-op powerpc: make dma_cache_sync a no-op mn10300: make dma_cache_sync a no-op microblaze: make dma_cache_sync a no-op ia64: make dma_cache_sync a no-op frv: make dma_cache_sync a no-op x86: make dma_cache_sync a no-op floppy: consolidate the dummy fd_cacheflush definition drivers: flag buses which demand DMA configuration
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_DMA_MAPPING_H
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#define _ASM_X86_DMA_MAPPING_H
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/*
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* IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
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* Documentation/DMA-API.txt for documentation.
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*/
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#include <linux/kmemcheck.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-debug.h>
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#include <asm/io.h>
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#include <asm/swiotlb.h>
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#include <linux/dma-contiguous.h>
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#include <linux/mem_encrypt.h>
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#ifdef CONFIG_ISA
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# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
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#else
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# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
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#endif
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extern int iommu_merge;
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extern struct device x86_dma_fallback_dev;
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extern int panic_on_overflow;
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extern const struct dma_map_ops *dma_ops;
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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return dma_ops;
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}
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bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
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#define arch_dma_alloc_attrs arch_dma_alloc_attrs
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extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_addr, gfp_t flag,
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unsigned long attrs);
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extern void dma_generic_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_addr,
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unsigned long attrs);
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#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
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extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
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extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
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extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
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#else
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (!dev->dma_mask)
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return 0;
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return addr + size - 1 <= *dev->dma_mask;
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}
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return __sme_set(paddr);
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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return __sme_clr(daddr);
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}
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#endif /* CONFIG_X86_DMA_REMAP */
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static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
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gfp_t gfp)
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{
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unsigned long dma_mask = 0;
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dma_mask = dev->coherent_dma_mask;
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if (!dma_mask)
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dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
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return dma_mask;
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}
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static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
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{
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unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
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if (dma_mask <= DMA_BIT_MASK(24))
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gfp |= GFP_DMA;
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#ifdef CONFIG_X86_64
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if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
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gfp |= GFP_DMA32;
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#endif
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return gfp;
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}
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#endif
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