diff options
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 29973baa0581..db8ab24a54f4 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -9,7 +9,7 @@ #include <linux/bug.h> #include <linux/cache.h> -/** +/* * List of possible attributes associated with a DMA mapping. The semantics * of each attribute should be defined in Documentation/core-api/dma-attributes.rst. */ @@ -80,11 +80,28 @@ #define DMA_ATTR_MMIO (1UL << 10) /* - * DMA_ATTR_CPU_CACHE_CLEAN: Indicates the CPU will not dirty any cacheline - * overlapping this buffer while it is mapped for DMA. All mappings sharing - * a cacheline must have this attribute for this to be considered safe. + * DMA_ATTR_DEBUGGING_IGNORE_CACHELINES: Indicates the CPU cache line can be + * overlapped. All mappings sharing a cacheline must have this attribute for + * this to be considered safe. + */ +#define DMA_ATTR_DEBUGGING_IGNORE_CACHELINES (1UL << 11) + +/* + * DMA_ATTR_REQUIRE_COHERENT: Indicates that DMA coherency is required. + * All mappings that carry this attribute can't work with SWIOTLB and cache + * flushing. + */ +#define DMA_ATTR_REQUIRE_COHERENT (1UL << 12) +/* + * DMA_ATTR_CC_SHARED: Indicates the DMA mapping is shared (decrypted) for + * confidential computing guests. For normal system memory the caller must have + * called set_memory_decrypted(), and pgprot_decrypted must be used when + * creating CPU PTEs for the mapping. The same shared semantic may be passed + * to the vIOMMU when it sets up the IOPTE. For MMIO use together with + * DMA_ATTR_MMIO to indicate shared MMIO. Unless DMA_ATTR_MMIO is provided + * a struct page is required. */ -#define DMA_ATTR_CPU_CACHE_CLEAN (1UL << 11) +#define DMA_ATTR_CC_SHARED (1UL << 13) /* * A dma_addr_t can hold any valid DMA or bus address for the platform. It can @@ -248,8 +265,8 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size, { return NULL; } -static void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, - dma_addr_t dma_handle, unsigned long attrs) +static inline void dma_free_attrs(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs) { } static inline void *dmam_alloc_attrs(struct device *dev, size_t size, |