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
  46 #ifdef CONFIG_ARCH_HAS_DMA_MMAP_PGPROT
  47 pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
  48                 unsigned long attrs);
  49 #else
  50 # define arch_dma_mmap_pgprot(dev, prot, attrs) pgprot_noncached(prot)
  51 #endif
  52
  53 #ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC
  54 void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  55                 enum dma_data_direction direction);
  56 #else
  57 static inline void arch_dma_cache_sync(struct device *dev, void *vaddr,
  58                 size_t size, enum dma_data_direction direction)
  59 {
  60 }
  61 #endif /* CONFIG_DMA_NONCOHERENT_CACHE_SYNC */
  62
  63 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
  64 void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
  65                 size_t size, enum dma_data_direction dir);
  66 #else
  67 static inline void arch_sync_dma_for_device(struct device *dev,
  68                 phys_addr_t paddr, size_t size, enum dma_data_direction dir)
  69 {
  70 }
  71 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
  72
  73 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
  74 void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
  75                 size_t size, enum dma_data_direction dir);
  76 #else
  77 static inline void arch_sync_dma_for_cpu(struct device *dev,
  78                 phys_addr_t paddr, size_t size, enum dma_data_direction dir)
  79 {
  80 }
  81 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
  82
  83 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
  84 void arch_sync_dma_for_cpu_all(struct device *dev);
  85 #else
  86 static inline void arch_sync_dma_for_cpu_all(struct device *dev)
  87 {
  88 }
  89 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
  90
  91 #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
  92 void arch_dma_prep_coherent(struct page *page, size_t size);
  93 #else
  94 static inline void arch_dma_prep_coherent(struct page *page, size_t size)
  95 {
  96 }
  97 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
  98
  99 void *uncached_kernel_address(void *addr);
 100 void *cached_kernel_address(void *addr);
 101
 102 #endif /* _LINUX_DMA_NONCOHERENT_H */