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 <=
  31                min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
  32}
  33#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
  34
  35/*
  36 * If memory encryption is supported, phys_to_dma will set the memory encryption
  37 * bit in the DMA address, and dma_to_phys will clear it.  The raw __phys_to_dma
  38 * and __dma_to_phys versions should only be used on non-encrypted memory for
  39 * special occasions like DMA coherent buffers.
  40 */
  41static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  42{
  43        return __sme_set(__phys_to_dma(dev, paddr));
  44}
  45
  46static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  47{
  48        return __sme_clr(__dma_to_phys(dev, daddr));
  49}
  50
  51u64 dma_direct_get_required_mask(struct device *dev);
  52void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  53                gfp_t gfp, unsigned long attrs);
  54void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
  55                dma_addr_t dma_addr, unsigned long attrs);
  56void *dma_direct_alloc_pages(struct device *dev, size_t size,
  57                dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
  58void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
  59                dma_addr_t dma_addr, unsigned long attrs);
  60struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
  61                dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
  62void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page);
  63int dma_direct_supported(struct device *dev, u64 mask);
  64#endif /* _LINUX_DMA_DIRECT_H */
  65