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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154/* SPDX-License-Identifier: GPL-2.0 *//* * Internals of the DMA direct mapping implementation. Only for use by the * DMA mapping code and IOMMU drivers. */#ifndef _LINUX_DMA_DIRECT_H#define _LINUX_DMA_DIRECT_H 1
#include <linux/dma-mapping.h>#include <linux/dma-map-ops.h>#include <linux/memblock.h> /* for min_low_pfn */#include <linux/mem_encrypt.h>#include <linux/swiotlb.h>
extern u64 zone_dma_limit;
/* * Record the mapping of CPU physical to DMA addresses for a given region. */struct bus_dma_region { phys_addr_t cpu_start; dma_addr_t dma_start; u64 size;};
static inline dma_addr_t translate_phys_to_dma(struct device *dev, phys_addr_t paddr){ const struct bus_dma_region *m;
for (m = dev->dma_range_map; m->size; m++) { u64 offset = paddr - m->cpu_start;
if (paddr >= m->cpu_start && offset < m->size) return m->dma_start + offset; }
/* make sure dma_capable fails when no translation is available */ return DMA_MAPPING_ERROR;}
static inline phys_addr_t translate_dma_to_phys(struct device *dev, dma_addr_t dma_addr){ const struct bus_dma_region *m;
for (m = dev->dma_range_map; m->size; m++) { u64 offset = dma_addr - m->dma_start;
if (dma_addr >= m->dma_start && offset < m->size) return m->cpu_start + offset; }
return (phys_addr_t)-1;}
static inline dma_addr_t dma_range_map_min(const struct bus_dma_region *map){ dma_addr_t ret = (dma_addr_t)U64_MAX;
for (; map->size; map++) ret = min(ret, map->dma_start); return ret;}
static inline dma_addr_t dma_range_map_max(const struct bus_dma_region *map){ dma_addr_t ret = 0;
for (; map->size; map++) ret = max(ret, map->dma_start + map->size - 1); return ret;}
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA#include <asm/dma-direct.h>#ifndef phys_to_dma_unencrypted#define phys_to_dma_unencrypted phys_to_dma#endif#elsestatic inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr){ if (dev->dma_range_map) return translate_phys_to_dma(dev, paddr); return paddr;}
static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev, phys_addr_t paddr){ return dma_addr_unencrypted(__phys_to_dma(dev, paddr));}/* * If memory encryption is supported, phys_to_dma will set the memory encryption * bit in the DMA address, and dma_to_phys will clear it. * phys_to_dma_unencrypted is for use on special unencrypted memory like swiotlb * buffers. */static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr){ return dma_addr_encrypted(__phys_to_dma(dev, paddr));}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr){ phys_addr_t paddr;
dma_addr = dma_addr_canonical(dma_addr); if (dev->dma_range_map) paddr = translate_dma_to_phys(dev, dma_addr); else paddr = dma_addr;
return paddr;}#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
#ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTEDbool force_dma_unencrypted(struct device *dev);#elsestatic inline bool force_dma_unencrypted(struct device *dev){ return false;}#endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, bool is_ram){ dma_addr_t end = addr + size - 1;
if (addr == DMA_MAPPING_ERROR) return false; if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn))) return false;
return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);}
u64 dma_direct_get_required_mask(struct device *dev);void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs);struct page *dma_direct_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);void dma_direct_free_pages(struct device *dev, size_t size, struct page *page, dma_addr_t dma_addr, enum dma_data_direction dir);int dma_direct_supported(struct device *dev, u64 mask);
#endif /* _LINUX_DMA_DIRECT_H */