128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Internals of the DMA direct mapping implementation. Only for use by the
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* DMA mapping code and IOMMU drivers.
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*/
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#ifndef _LINUX_DMA_DIRECT_H
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#define _LINUX_DMA_DIRECT_H 1
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#include <linux/dma-mapping.h>
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#include <linux/dma-map-ops.h>
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#include <linux/memblock.h> /* for min_low_pfn */
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#include <linux/mem_encrypt.h>
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#include <linux/swiotlb.h>
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extern unsigned int zone_dma_bits;
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/*
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* Record the mapping of CPU physical to DMA addresses for a given region.
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*/
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struct bus_dma_region {
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phys_addr_t cpu_start;
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dma_addr_t dma_start;
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u64 size;
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u64 offset;
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};
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static inline dma_addr_t translate_phys_to_dma(struct device *dev,
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phys_addr_t paddr)
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{
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const struct bus_dma_region *m;
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for (m = dev->dma_range_map; m->size; m++)
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if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size)
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return (dma_addr_t)paddr - m->offset;
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/* make sure dma_capable fails when no translation is available */
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return DMA_MAPPING_ERROR;
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}
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static inline phys_addr_t translate_dma_to_phys(struct device *dev,
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dma_addr_t dma_addr)
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{
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const struct bus_dma_region *m;
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for (m = dev->dma_range_map; m->size; m++)
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if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size)
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return (phys_addr_t)dma_addr + m->offset;
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return (phys_addr_t)-1;
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}
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#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
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#include <asm/dma-direct.h>
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#ifndef phys_to_dma_unencrypted
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#define phys_to_dma_unencrypted phys_to_dma
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#endif
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#else
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static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev,
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phys_addr_t paddr)
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{
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if (dev->dma_range_map)
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return translate_phys_to_dma(dev, paddr);
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return paddr;
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}
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/*
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* If memory encryption is supported, phys_to_dma will set the memory encryption
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* bit in the DMA address, and dma_to_phys will clear it.
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* phys_to_dma_unencrypted is for use on special unencrypted memory like swiotlb
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* buffers.
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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(phys_to_dma_unencrypted(dev, paddr));
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
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{
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phys_addr_t paddr;
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if (dev->dma_range_map)
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paddr = translate_dma_to_phys(dev, dma_addr);
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else
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paddr = dma_addr;
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return __sme_clr(paddr);
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}
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#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
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#ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
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bool force_dma_unencrypted(struct device *dev);
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#else
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static inline bool force_dma_unencrypted(struct device *dev)
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{
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return false;
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}
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#endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
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bool is_ram)
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{
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dma_addr_t end = addr + size - 1;
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if (addr == DMA_MAPPING_ERROR)
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return false;
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if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
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min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
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return false;
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return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
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}
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u64 dma_direct_get_required_mask(struct device *dev);
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void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs);
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void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_addr, unsigned long attrs);
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struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
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dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
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void dma_direct_free_pages(struct device *dev, size_t size,
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struct page *page, dma_addr_t dma_addr,
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enum dma_data_direction dir);
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int dma_direct_supported(struct device *dev, u64 mask);
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dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir, unsigned long attrs);
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#endif /* _LINUX_DMA_DIRECT_H */
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