root/include/linux/dma-direct.h

INCLUDED FROM

DEFINITIONS

1. __phys_to_dma
2. __dma_to_phys
3. dma_capable
4. force_dma_unencrypted
5. phys_to_dma
6. dma_to_phys

   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/memblock.h> /* for min_low_pfn */
   7 #include <linux/mem_encrypt.h>
   8 
   9 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
  10 
  11 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
  12 #include <asm/dma-direct.h>
  13 #else
  14 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
  15 {
  16         dma_addr_t dev_addr = (dma_addr_t)paddr;
  17 
  18         return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  19 }
  20 
  21 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  22 {
  23         phys_addr_t paddr = (phys_addr_t)dev_addr;
  24 
  25         return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
  26 }
  27 
  28 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  29 {
  30         dma_addr_t end = addr + size - 1;
  31 
  32         if (!dev->dma_mask)
  33                 return false;
  34 
  35         if (!IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
  36             min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
  37                 return false;
  38 
  39         return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
  40 }
  41 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
  42 
  43 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
  44 bool force_dma_unencrypted(struct device *dev);
  45 #else
  46 static inline bool force_dma_unencrypted(struct device *dev)
  47 {
  48         return false;
  49 }
  50 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
  51 
  52 /*
  53  * If memory encryption is supported, phys_to_dma will set the memory encryption
  54  * bit in the DMA address, and dma_to_phys will clear it.  The raw __phys_to_dma
  55  * and __dma_to_phys versions should only be used on non-encrypted memory for
  56  * special occasions like DMA coherent buffers.
  57  */
  58 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  59 {
  60         return __sme_set(__phys_to_dma(dev, paddr));
  61 }
  62 
  63 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  64 {
  65         return __sme_clr(__dma_to_phys(dev, daddr));
  66 }
  67 
  68 u64 dma_direct_get_required_mask(struct device *dev);
  69 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  70                 gfp_t gfp, unsigned long attrs);
  71 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
  72                 dma_addr_t dma_addr, unsigned long attrs);
  73 void *dma_direct_alloc_pages(struct device *dev, size_t size,
  74                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
  75 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
  76                 dma_addr_t dma_addr, unsigned long attrs);
  77 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
  78                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
  79 void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page);
  80 int dma_direct_supported(struct device *dev, u64 mask);
  81 #endif /* _LINUX_DMA_DIRECT_H */