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 | */ | |
| 26 | static inline bool dma_alloc_need_uncached(struct device *dev, | |
| 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); | |
| 45 | ||
| 46 | #ifdef CONFIG_ARCH_HAS_DMA_MMAP_PGPROT | |
| 47 | pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot, | |
| 782e6769 | 48 | unsigned long attrs); |
| 58b04406 CH |
49 | #else |
| 50 | # define arch_dma_mmap_pgprot(dev, prot, attrs) pgprot_noncached(prot) | |
| 51 | #endif | |
| 782e6769 CH |
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 | |
| 356da6d0 CH |
57 | static inline void arch_dma_cache_sync(struct device *dev, void *vaddr, |
| 58 | size_t size, enum dma_data_direction direction) | |
| 59 | { | |
| 60 | } | |
| 782e6769 CH |
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 | ||
| faef8772 CH |
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 | ||
| 13bf5ced | 91 | #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT |
| 0c3b3171 | 92 | void arch_dma_prep_coherent(struct page *page, size_t size); |
| 13bf5ced CH |
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 */ | |
| 0c3b3171 | 98 | |
| c30700db CH |
99 | void *uncached_kernel_address(void *addr); |
| 100 | void *cached_kernel_address(void *addr); | |
| 101 | ||
| 782e6769 | 102 | #endif /* _LINUX_DMA_NONCOHERENT_H */ |