projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 782e6769 CH |
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 | ||
| f3ecc0ff CH |
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 | ||
| 4b85faed CH |
23 | /* |
| 24 | * Check if an allocation needs to be marked uncached to be coherent. | |
| 25 | */ | |
| 15ffe5e1 | 26 | static __always_inline bool dma_alloc_need_uncached(struct device *dev, |
| 4b85faed CH |
27 | unsigned long attrs) |
| 28 | { | |
| 29 | if (dev_is_dma_coherent(dev)) | |
| 30 | return false; | |
| d98849af CH |
31 | if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) |
| 32 | return false; | |
| 4b85faed CH |
33 | if (IS_ENABLED(CONFIG_DMA_NONCOHERENT_CACHE_SYNC) && |
| 34 | (attrs & DMA_ATTR_NON_CONSISTENT)) | |
| 35 | return false; | |
| 36 | return true; | |
| 37 | } | |
| 38 | ||
| 782e6769 CH |
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); | |
| 58b04406 CH |
43 | long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, |
| 44 | dma_addr_t dma_addr); | |
| 58b04406 | 45 | pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot, |
| 782e6769 | 46 | unsigned long attrs); |
| 33dcb37c CH |
47 | |
| 48 | #ifdef CONFIG_MMU | |
| 49 | pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs); | |
| 58b04406 | 50 | #else |
| 33dcb37c CH |
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 */ | |
| 782e6769 CH |
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 | |
| 356da6d0 CH |
62 | static inline void arch_dma_cache_sync(struct device *dev, void *vaddr, |
| 63 | size_t size, enum dma_data_direction direction) | |
| 64 | { | |
| 65 | } | |
| 782e6769 CH |
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 | ||
| faef8772 CH |
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 | ||
| 13bf5ced | 96 | #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT |
| 0c3b3171 | 97 | void arch_dma_prep_coherent(struct page *page, size_t size); |
| 13bf5ced CH |
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 */ | |
| 0c3b3171 | 103 | |
| c30700db CH |
104 | void *uncached_kernel_address(void *addr); |
| 105 | void *cached_kernel_address(void *addr); | |
| 106 | ||
| 782e6769 | 107 | #endif /* _LINUX_DMA_NONCOHERENT_H */ |