| /* 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-noncoherent.h> |
| #include <linux/memblock.h> /* for min_low_pfn */ |
| #include <linux/mem_encrypt.h> |
| #include <linux/swiotlb.h> |
| |
| /* |
| * 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; |
| u64 offset; |
| }; |
| |
| 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++) |
| if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size) |
| return (dma_addr_t)paddr - m->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++) |
| if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size) |
| return (phys_addr_t)dma_addr + m->offset; |
| |
| return (phys_addr_t)-1; |
| } |
| |
| #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 |
| #else |
| static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev, |
| phys_addr_t paddr) |
| { |
| if (dev->dma_range_map) |
| return translate_phys_to_dma(dev, paddr); |
| return 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 __sme_set(phys_to_dma_unencrypted(dev, paddr)); |
| } |
| |
| static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr) |
| { |
| phys_addr_t paddr; |
| |
| if (dev->dma_range_map) |
| paddr = translate_dma_to_phys(dev, dma_addr); |
| else |
| paddr = dma_addr; |
| |
| return __sme_clr(paddr); |
| } |
| #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ |
| |
| #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED |
| bool force_dma_unencrypted(struct device *dev); |
| #else |
| static 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 (!dev->dma_mask) |
| return false; |
| |
| 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_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); |
| int dma_direct_supported(struct device *dev, u64 mask); |
| 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); |
| dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr, |
| size_t size, enum dma_data_direction dir, unsigned long attrs); |
| 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); |
| #else |
| static 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); |
| #else |
| static 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); |
| |
| if (unlikely(is_swiotlb_buffer(dev, paddr))) |
| swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE); |
| |
| if (!dev_is_dma_coherent(dev)) |
| arch_sync_dma_for_device(paddr, size, dir); |
| } |
| |
| static inline void dma_direct_sync_single_for_cpu(struct device *dev, |
| dma_addr_t addr, size_t size, enum dma_data_direction dir) |
| { |
| phys_addr_t paddr = dma_to_phys(dev, addr); |
| |
| if (!dev_is_dma_coherent(dev)) { |
| arch_sync_dma_for_cpu(paddr, size, dir); |
| arch_sync_dma_for_cpu_all(); |
| } |
| |
| if (unlikely(is_swiotlb_buffer(dev, paddr))) |
| swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU); |
| |
| if (dir == DMA_FROM_DEVICE) |
| arch_dma_mark_clean(paddr, size); |
| } |
| |
| static inline bool dma_direct_possible(struct device *dev, dma_addr_t dma_addr, |
| size_t size) |
| { |
| return swiotlb_force != SWIOTLB_FORCE && |
| dma_capable(dev, dma_addr, size, true); |
| } |
| |
| static inline void report_addr(struct device *dev, dma_addr_t dma_addr, |
| size_t size) |
| { |
| if (!dev->dma_mask) { |
| dev_err_once(dev, "DMA map on device without dma_mask\n"); |
| } else if (*dev->dma_mask >= DMA_BIT_MASK(32) || dev->bus_dma_limit) { |
| dev_err_once(dev, |
| "overflow %pad+%zu of DMA mask %llx bus limit %llx\n", |
| &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit); |
| } |
| WARN_ON_ONCE(1); |
| } |
| |
| static inline dma_addr_t dma_direct_map_page(struct device *dev, |
| struct page *page, unsigned long offset, size_t size, |
| enum dma_data_direction dir, unsigned long attrs) |
| { |
| phys_addr_t phys = page_to_phys(page) + offset; |
| dma_addr_t dma_addr = phys_to_dma(dev, phys); |
| |
| if ((unlikely(!dma_direct_possible(dev, dma_addr, size)) || |
| is_dev_swiotlb_force(dev)) && |
| !swiotlb_map(dev, &phys, &dma_addr, size, dir, attrs)) { |
| report_addr(dev, dma_addr, size); |
| return DMA_MAPPING_ERROR; |
| } |
| |
| if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) |
| arch_sync_dma_for_device(phys, size, dir); |
| return dma_addr; |
| } |
| |
| static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr, |
| size_t size, enum dma_data_direction dir, unsigned long attrs) |
| { |
| phys_addr_t phys = dma_to_phys(dev, addr); |
| |
| if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) |
| dma_direct_sync_single_for_cpu(dev, addr, size, dir); |
| |
| if (unlikely(is_swiotlb_buffer(dev, phys))) |
| swiotlb_tbl_unmap_single(dev, phys, size, size, dir, |
| attrs | DMA_ATTR_SKIP_CPU_SYNC); |
| } |
| #endif /* _LINUX_DMA_DIRECT_H */ |