include/linux/dma-noncoherent.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_DMA_NONCOHERENT_H
   3 #define _LINUX_DMA_NONCOHERENT_H 1
   4
   5 #include <linux/dma-mapping.h>
   6
   7 #ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H
   8 #include <asm/dma-coherence.h>
   9 #elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
  10         defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
  11         defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
  12 static inline bool dev_is_dma_coherent(struct device *dev)
  13 {
  14         return dev->dma_coherent;
  15 }
  16 #else
  17 static inline bool dev_is_dma_coherent(struct device *dev)
  18 {
  19         return true;
  20 }
  21 #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
  22
  23 /*
  24  * Check if an allocation needs to be marked uncached to be coherent.
  25  */
  26 static __always_inline bool dma_alloc_need_uncached(struct device *dev,
  27                 unsigned long attrs)
  28 {
  29         if (dev_is_dma_coherent(dev))
  30                 return false;
  31         if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
  32                 return false;
  33         if (IS_ENABLED(CONFIG_DMA_NONCOHERENT_CACHE_SYNC) &&
  34             (attrs & DMA_ATTR_NON_CONSISTENT))
  35                 return false;
  36         return true;
  37 }
  38
  39 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  40                 gfp_t gfp, unsigned long attrs);
  41 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
  42                 dma_addr_t dma_addr, unsigned long attrs);
  43 long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
  44                 dma_addr_t dma_addr);
  45 pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
  46                 unsigned long attrs);
  47
  48 #ifdef CONFIG_MMU
  49 pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs);
  50 #else
  51 static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot,
  52                 unsigned long attrs)
  53 {
  54         return prot;    /* no protection bits supported without page tables */
  55 }
  56 #endif /* CONFIG_MMU */
  57
  58 #ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC
  59 void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  60                 enum dma_data_direction direction);
  61 #else
  62 static inline void arch_dma_cache_sync(struct device *dev, void *vaddr,
  63                 size_t size, enum dma_data_direction direction)
  64 {
  65 }
  66 #endif /* CONFIG_DMA_NONCOHERENT_CACHE_SYNC */
  67
  68 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
  69 void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
  70                 size_t size, enum dma_data_direction dir);
  71 #else
  72 static inline void arch_sync_dma_for_device(struct device *dev,
  73                 phys_addr_t paddr, size_t size, enum dma_data_direction dir)
  74 {
  75 }
  76 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
  77
  78 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
  79 void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
  80                 size_t size, enum dma_data_direction dir);
  81 #else
  82 static inline void arch_sync_dma_for_cpu(struct device *dev,
  83                 phys_addr_t paddr, size_t size, enum dma_data_direction dir)
  84 {
  85 }
  86 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
  87
  88 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
  89 void arch_sync_dma_for_cpu_all(struct device *dev);
  90 #else
  91 static inline void arch_sync_dma_for_cpu_all(struct device *dev)
  92 {
  93 }
  94 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
  95
  96 #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
  97 void arch_dma_prep_coherent(struct page *page, size_t size);
  98 #else
  99 static inline void arch_dma_prep_coherent(struct page *page, size_t size)
 100 {
 101 }
 102 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
 103
 104 void *uncached_kernel_address(void *addr);
 105 void *cached_kernel_address(void *addr);
 106
 107 #endif /* _LINUX_DMA_NONCOHERENT_H */