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 #define DIRECT_MAPPING_ERROR            (~(dma_addr_t)0)
   9
  10 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
  11 #include <asm/dma-direct.h>
  12 #else
  13 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
  14 {
  15         dma_addr_t dev_addr = (dma_addr_t)paddr;
  16
  17         return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  18 }
  19
  20 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  21 {
  22         phys_addr_t paddr = (phys_addr_t)dev_addr;
  23
  24         return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  25 }
  26
  27 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  28 {
  29         if (!dev->dma_mask)
  30                 return false;
  31
  32         return addr + size - 1 <=
  33                 min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
  34 }
  35 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
  36
  37 /*
  38  * If memory encryption is supported, phys_to_dma will set the memory encryption
  39  * bit in the DMA address, and dma_to_phys will clear it.  The raw __phys_to_dma
  40  * and __dma_to_phys versions should only be used on non-encrypted memory for
  41  * special occasions like DMA coherent buffers.
  42  */
  43 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  44 {
  45         return __sme_set(__phys_to_dma(dev, paddr));
  46 }
  47
  48 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  49 {
  50         return __sme_clr(__dma_to_phys(dev, daddr));
  51 }
  52
  53 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
  54 void dma_mark_clean(void *addr, size_t size);
  55 #else
  56 static inline void dma_mark_clean(void *addr, size_t size)
  57 {
  58 }
  59 #endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
  60
  61 u64 dma_direct_get_required_mask(struct device *dev);
  62 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  63                 gfp_t gfp, unsigned long attrs);
  64 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
  65                 dma_addr_t dma_addr, unsigned long attrs);
  66 void *dma_direct_alloc_pages(struct device *dev, size_t size,
  67                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
  68 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
  69                 dma_addr_t dma_addr, unsigned long attrs);
  70 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
  71                 unsigned long offset, size_t size, enum dma_data_direction dir,
  72                 unsigned long attrs);
  73 int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
  74                 enum dma_data_direction dir, unsigned long attrs);
  75 int dma_direct_supported(struct device *dev, u64 mask);
  76 int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
  77 #endif /* _LINUX_DMA_DIRECT_H */