arch/x86/include/asm/dma-direct.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ASM_X86_DMA_DIRECT_H
   3 #define ASM_X86_DMA_DIRECT_H 1
   4
   5 #include <linux/mem_encrypt.h>
   6
   7 #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
   8 bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
   9 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
  10 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
  11 #else
  12 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  13 {
  14         if (!dev->dma_mask)
  15                 return 0;
  16
  17         return addr + size - 1 <= *dev->dma_mask;
  18 }
  19
  20 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  21 {
  22         return __sme_set(paddr);
  23 }
  24
  25 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  26 {
  27         return __sme_clr(daddr);
  28 }
  29 #endif /* CONFIG_X86_DMA_REMAP */
  30 #endif /* ASM_X86_DMA_DIRECT_H */