forked from Minki/linux
cea9d03c82
To implement the x86 forbid_dac and iommu_sac_force we want an arch hook so that it can apply the global options across all dma_map_ops implementations. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
73 lines
1.8 KiB
C
73 lines
1.8 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/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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#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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int arch_dma_supported(struct device *dev, u64 mask);
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#define arch_dma_supported arch_dma_supported
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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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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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