LXR linux/include/linux/dma-direct.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_DMA_DIRECT_H
   3#define _LINUX_DMA_DIRECT_H 1
   4
   5#include <linux/dma-mapping.h>
   6#include <linux/mem_encrypt.h>
   7
   8#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
   9#include <asm/dma-direct.h>
  10#else
  11static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
  12{
  13        dma_addr_t dev_addr = (dma_addr_t)paddr;
  14
  15        return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  16}
  17
  18static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  19{
  20        phys_addr_t paddr = (phys_addr_t)dev_addr;
  21
  22        return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  23}
  24
  25static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  26{
  27        if (!dev->dma_mask)
  28                return false;
  29
  30        return addr + size - 1 <= *dev->dma_mask;
  31}
  32#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
  33
  34/*
  35 * If memory encryption is supported, phys_to_dma will set the memory encryption
  36 * bit in the DMA address, and dma_to_phys will clear it.  The raw __phys_to_dma
  37 * and __dma_to_phys versions should only be used on non-encrypted memory for
  38 * special occasions like DMA coherent buffers.
  39 */
  40static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  41{
  42        return __sme_set(__phys_to_dma(dev, paddr));
  43}
  44
  45static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  46{
  47        return __sme_clr(__dma_to_phys(dev, daddr));
  48}
  49
  50#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
  51void dma_mark_clean(void *addr, size_t size);
  52#else
  53static inline void dma_mark_clean(void *addr, size_t size)
  54{
  55}
  56#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
  57
  58void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  59                gfp_t gfp, unsigned long attrs);
  60void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
  61                dma_addr_t dma_addr, unsigned long attrs);
  62dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
  63                unsigned long offset, size_t size, enum dma_data_direction dir,
  64                unsigned long attrs);
  65int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
  66                enum dma_data_direction dir, unsigned long attrs);
  67int dma_direct_supported(struct device *dev, u64 mask);
  68int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
  69#endif /* _LINUX_DMA_DIRECT_H */
  70