diff options
Diffstat (limited to 'include/linux/dma-map-ops.h')
| -rw-r--r-- | include/linux/dma-map-ops.h | 187 |
1 files changed, 149 insertions, 38 deletions
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 8029f7e04145..f48e5fb88bd5 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -8,8 +8,10 @@ #include <linux/dma-mapping.h> #include <linux/pgtable.h> +#include <linux/slab.h> struct cma; +struct iommu_ops; struct dma_map_ops { void *(*alloc)(struct device *dev, size_t size, @@ -17,16 +19,11 @@ struct dma_map_ops { unsigned long attrs); void (*free)(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle, unsigned long attrs); - struct page *(*alloc_pages)(struct device *dev, size_t size, + struct page *(*alloc_pages_op)(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); void (*free_pages)(struct device *dev, size_t size, struct page *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir); - void *(*alloc_noncoherent)(struct device *dev, size_t size, - dma_addr_t *dma_handle, enum dma_data_direction dir, - gfp_t gfp); - void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, enum dma_data_direction dir); int (*mmap)(struct device *, struct vm_area_struct *, void *, dma_addr_t, size_t, unsigned long attrs); @@ -41,8 +38,9 @@ struct dma_map_ops { size_t size, enum dma_data_direction dir, unsigned long attrs); /* - * map_sg returns 0 on error and a value > 0 on success. - * It should never return a value < 0. + * map_sg should return a negative error code on error. See + * dma_map_sgtable() for a list of appropriate error codes + * and their meanings. */ int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs); @@ -68,17 +66,18 @@ struct dma_map_ops { int (*dma_supported)(struct device *dev, u64 mask); u64 (*get_required_mask)(struct device *dev); size_t (*max_mapping_size)(struct device *dev); + size_t (*opt_mapping_size)(void); unsigned long (*get_merge_boundary)(struct device *dev); }; -#ifdef CONFIG_DMA_OPS +#ifdef CONFIG_ARCH_HAS_DMA_OPS #include <asm/dma-mapping.h> static inline const struct dma_map_ops *get_dma_ops(struct device *dev) { if (dev->dma_ops) return dev->dma_ops; - return get_arch_dma_ops(dev->bus); + return get_arch_dma_ops(); } static inline void set_dma_ops(struct device *dev, @@ -86,7 +85,7 @@ static inline void set_dma_ops(struct device *dev, { dev->dma_ops = dma_ops; } -#else /* CONFIG_DMA_OPS */ +#else /* CONFIG_ARCH_HAS_DMA_OPS */ static inline const struct dma_map_ops *get_dma_ops(struct device *dev) { return NULL; @@ -95,7 +94,7 @@ static inline void set_dma_ops(struct device *dev, const struct dma_map_ops *dma_ops) { } -#endif /* CONFIG_DMA_OPS */ +#endif /* CONFIG_ARCH_HAS_DMA_OPS */ #ifdef CONFIG_DMA_CMA extern struct cma *dma_contiguous_default_area; @@ -156,37 +155,36 @@ static inline void dma_free_contiguous(struct device *dev, struct page *page, } #endif /* CONFIG_DMA_CMA*/ -#ifdef CONFIG_DMA_PERNUMA_CMA -void dma_pernuma_cma_reserve(void); -#else -static inline void dma_pernuma_cma_reserve(void) { } -#endif /* CONFIG_DMA_PERNUMA_CMA */ - #ifdef CONFIG_DMA_DECLARE_COHERENT int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size); +void dma_release_coherent_memory(struct device *dev); int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret); int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr); int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, size_t size, int *ret); - -void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size, - dma_addr_t *dma_handle); -int dma_release_from_global_coherent(int order, void *vaddr); -int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr, - size_t size, int *ret); - #else static inline int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size) { return -ENOSYS; } + #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0) #define dma_release_from_dev_coherent(dev, order, vaddr) (0) #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) +static inline void dma_release_coherent_memory(struct device *dev) { } +#endif /* CONFIG_DMA_DECLARE_COHERENT */ +#ifdef CONFIG_DMA_GLOBAL_POOL +void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size, + dma_addr_t *dma_handle); +int dma_release_from_global_coherent(int order, void *vaddr); +int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr, + size_t size, int *ret); +int dma_init_global_coherent(phys_addr_t phys_addr, size_t size); +#else static inline void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle) { @@ -201,29 +199,131 @@ static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, { return 0; } -#endif /* CONFIG_DMA_DECLARE_COHERENT */ - -#ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H -#include <asm/dma-coherence.h> -#elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ +#endif /* CONFIG_DMA_GLOBAL_POOL */ + +int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs); +int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs); +struct page *dma_common_alloc_pages(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); +void dma_common_free_pages(struct device *dev, size_t size, struct page *vaddr, + dma_addr_t dma_handle, enum dma_data_direction dir); + +struct page **dma_common_find_pages(void *cpu_addr); +void *dma_common_contiguous_remap(struct page *page, size_t size, pgprot_t prot, + const void *caller); +void *dma_common_pages_remap(struct page **pages, size_t size, pgprot_t prot, + const void *caller); +void dma_common_free_remap(void *cpu_addr, size_t size); + +struct page *dma_alloc_from_pool(struct device *dev, size_t size, + void **cpu_addr, gfp_t flags, + bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t)); +bool dma_free_from_pool(struct device *dev, void *start, size_t size); + +int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start, + dma_addr_t dma_start, u64 size); + +#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) +extern bool dma_default_coherent; static inline bool dev_is_dma_coherent(struct device *dev) { return dev->dma_coherent; } #else +#define dma_default_coherent true + static inline bool dev_is_dma_coherent(struct device *dev) { return true; } -#endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */ +#endif + +static inline void dma_reset_need_sync(struct device *dev) +{ +#ifdef CONFIG_DMA_NEED_SYNC + /* Reset it only once so that the function can be called on hotpath */ + if (unlikely(dev->dma_skip_sync)) + dev->dma_skip_sync = false; +#endif +} + +/* + * Check whether potential kmalloc() buffers are safe for non-coherent DMA. + */ +static inline bool dma_kmalloc_safe(struct device *dev, + enum dma_data_direction dir) +{ + /* + * If DMA bouncing of kmalloc() buffers is disabled, the kmalloc() + * caches have already been aligned to a DMA-safe size. + */ + if (!IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC)) + return true; + + /* + * kmalloc() buffers are DMA-safe irrespective of size if the device + * is coherent or the direction is DMA_TO_DEVICE (non-desctructive + * cache maintenance and benign cache line evictions). + */ + if (dev_is_dma_coherent(dev) || dir == DMA_TO_DEVICE) + return true; + + return false; +} + +/* + * Check whether the given size, assuming it is for a kmalloc()'ed buffer, is + * sufficiently aligned for non-coherent DMA. + */ +static inline bool dma_kmalloc_size_aligned(size_t size) +{ + /* + * Larger kmalloc() sizes are guaranteed to be aligned to + * ARCH_DMA_MINALIGN. + */ + if (size >= 2 * ARCH_DMA_MINALIGN || + IS_ALIGNED(kmalloc_size_roundup(size), dma_get_cache_alignment())) + return true; + + return false; +} + +/* + * Check whether the given object size may have originated from a kmalloc() + * buffer with a slab alignment below the DMA-safe alignment and needs + * bouncing for non-coherent DMA. The pointer alignment is not considered and + * in-structure DMA-safe offsets are the responsibility of the caller. Such + * code should use the static ARCH_DMA_MINALIGN for compiler annotations. + * + * The heuristics can have false positives, bouncing unnecessarily, though the + * buffers would be small. False negatives are theoretically possible if, for + * example, multiple small kmalloc() buffers are coalesced into a larger + * buffer that passes the alignment check. There are no such known constructs + * in the kernel. + */ +static inline bool dma_kmalloc_needs_bounce(struct device *dev, size_t size, + enum dma_data_direction dir) +{ + return !dma_kmalloc_safe(dev, dir) && !dma_kmalloc_size_aligned(size); +} void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs); +#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK +void arch_dma_set_mask(struct device *dev, u64 mask); +#else +#define arch_dma_set_mask(dev, mask) do { } while (0) +#endif + #ifdef CONFIG_MMU /* * Page protection so that devices that can't snoop CPU caches can use the @@ -291,12 +391,24 @@ static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size) void *arch_dma_set_uncached(void *addr, size_t size); void arch_dma_clear_uncached(void *addr, size_t size); +#ifdef CONFIG_ARCH_HAS_DMA_MAP_DIRECT +bool arch_dma_map_page_direct(struct device *dev, phys_addr_t addr); +bool arch_dma_unmap_page_direct(struct device *dev, dma_addr_t dma_handle); +bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg, + int nents); +bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg, + int nents); +#else +#define arch_dma_map_page_direct(d, a) (false) +#define arch_dma_unmap_page_direct(d, a) (false) +#define arch_dma_map_sg_direct(d, s, n) (false) +#define arch_dma_unmap_sg_direct(d, s, n) (false) +#endif + #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS -void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, - const struct iommu_ops *iommu, bool coherent); +void arch_setup_dma_ops(struct device *dev, bool coherent); #else -static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, - u64 size, const struct iommu_ops *iommu, bool coherent) +static inline void arch_setup_dma_ops(struct device *dev, bool coherent) { } #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */ @@ -310,10 +422,10 @@ static inline void arch_teardown_dma_ops(struct device *dev) #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */ #ifdef CONFIG_DMA_API_DEBUG -void dma_debug_add_bus(struct bus_type *bus); +void dma_debug_add_bus(const struct bus_type *bus); void debug_dma_dump_mappings(struct device *dev); #else -static inline void dma_debug_add_bus(struct bus_type *bus) +static inline void dma_debug_add_bus(const struct bus_type *bus) { } static inline void debug_dma_dump_mappings(struct device *dev) @@ -322,5 +434,4 @@ static inline void debug_dma_dump_mappings(struct device *dev) #endif /* CONFIG_DMA_API_DEBUG */ extern const struct dma_map_ops dma_dummy_ops; - #endif /* _LINUX_DMA_MAP_OPS_H */ |