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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156/* SPDX-License-Identifier: GPL-2.0 *//* * Copyright (C) 2018 Christoph Hellwig. * * DMA operations that map physical memory directly without using an IOMMU. */#ifndef _KERNEL_DMA_DIRECT_H#define _KERNEL_DMA_DIRECT_H
#include <linux/dma-direct.h>#include <linux/memremap.h>
int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs);bool dma_direct_can_mmap(struct device *dev);int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs);bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr);int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs);bool dma_direct_all_ram_mapped(struct device *dev);size_t dma_direct_max_mapping_size(struct device *dev);
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ defined(CONFIG_SWIOTLB)void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir);#elsestatic inline void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir){}#endif
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \ defined(CONFIG_SWIOTLB)void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs);void dma_direct_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir);#elsestatic inline void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs){}static inline void dma_direct_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir){}#endif
static inline void dma_direct_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir){ phys_addr_t paddr = dma_to_phys(dev, addr);
swiotlb_sync_single_for_device(dev, paddr, size, dir);
if (!dev_is_dma_coherent(dev)) { arch_sync_dma_for_device(paddr, size, dir); arch_sync_dma_flush(); }}
static inline void dma_direct_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir, bool flush){ phys_addr_t paddr = dma_to_phys(dev, addr);
if (!dev_is_dma_coherent(dev)) { arch_sync_dma_for_cpu(paddr, size, dir); if (flush) arch_sync_dma_flush(); arch_sync_dma_for_cpu_all(); }
swiotlb_sync_single_for_cpu(dev, paddr, size, dir);}
static inline dma_addr_t dma_direct_map_phys(struct device *dev, phys_addr_t phys, size_t size, enum dma_data_direction dir, unsigned long attrs, bool flush){ dma_addr_t dma_addr;
if (is_swiotlb_force_bounce(dev)) { if (!(attrs & DMA_ATTR_CC_SHARED)) { if (attrs & (DMA_ATTR_MMIO | DMA_ATTR_REQUIRE_COHERENT)) return DMA_MAPPING_ERROR;
return swiotlb_map(dev, phys, size, dir, attrs); } } else if (attrs & DMA_ATTR_CC_SHARED) { return DMA_MAPPING_ERROR; }
if (attrs & DMA_ATTR_MMIO) { dma_addr = phys; if (unlikely(!dma_capable(dev, dma_addr, size, false))) goto err_overflow; } else if (attrs & DMA_ATTR_CC_SHARED) { dma_addr = phys_to_dma_unencrypted(dev, phys); if (unlikely(!dma_capable(dev, dma_addr, size, false))) goto err_overflow; } else { dma_addr = phys_to_dma(dev, phys); if (unlikely(!dma_capable(dev, dma_addr, size, true)) || dma_kmalloc_needs_bounce(dev, size, dir)) { if (is_swiotlb_active(dev) && !(attrs & DMA_ATTR_REQUIRE_COHERENT)) return swiotlb_map(dev, phys, size, dir, attrs);
goto err_overflow; } }
if (!dev_is_dma_coherent(dev) && !(attrs & (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_MMIO))) { arch_sync_dma_for_device(phys, size, dir); if (flush) arch_sync_dma_flush(); } return dma_addr;
err_overflow: dev_WARN_ONCE( dev, 1, "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n", &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit); return DMA_MAPPING_ERROR;}
static inline void dma_direct_unmap_phys(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs, bool flush){ phys_addr_t phys;
if (attrs & (DMA_ATTR_MMIO | DMA_ATTR_REQUIRE_COHERENT)) /* nothing to do: uncached and no swiotlb */ return;
phys = dma_to_phys(dev, addr); if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) dma_direct_sync_single_for_cpu(dev, addr, size, dir, flush);
swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);}#endif /* _KERNEL_DMA_DIRECT_H */