diff options
Diffstat (limited to 'include/linux/dma-map-ops.h')
| -rw-r--r-- | include/linux/dma-map-ops.h | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h new file mode 100644 index 000000000000..a5f89fc4d6df --- /dev/null +++ b/include/linux/dma-map-ops.h @@ -0,0 +1,349 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * This header is for implementations of dma_map_ops and related code. + * It should not be included in drivers just using the DMA API. + */ +#ifndef _LINUX_DMA_MAP_OPS_H +#define _LINUX_DMA_MAP_OPS_H + +#include <linux/dma-mapping.h> +#include <linux/pgtable.h> + +struct cma; + +struct dma_map_ops { + void *(*alloc)(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, + 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, + 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); + + int (*get_sgtable)(struct device *dev, struct sg_table *sgt, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs); + + dma_addr_t (*map_page)(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, unsigned long attrs); + void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, + 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. + */ + int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir, unsigned long attrs); + void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir, unsigned long attrs); + dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs); + void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir, + unsigned long attrs); + void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir); + void (*sync_single_for_device)(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction dir); + void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir); + void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir); + void (*cache_sync)(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction); + int (*dma_supported)(struct device *dev, u64 mask); + u64 (*get_required_mask)(struct device *dev); + size_t (*max_mapping_size)(struct device *dev); + unsigned long (*get_merge_boundary)(struct device *dev); +}; + +#ifdef CONFIG_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); +} + +static inline void set_dma_ops(struct device *dev, + const struct dma_map_ops *dma_ops) +{ + dev->dma_ops = dma_ops; +} +#else /* CONFIG_DMA_OPS */ +static inline const struct dma_map_ops *get_dma_ops(struct device *dev) +{ + return NULL; +} +static inline void set_dma_ops(struct device *dev, + const struct dma_map_ops *dma_ops) +{ +} +#endif /* CONFIG_DMA_OPS */ + +#ifdef CONFIG_DMA_CMA +extern struct cma *dma_contiguous_default_area; + +static inline struct cma *dev_get_cma_area(struct device *dev) +{ + if (dev && dev->cma_area) + return dev->cma_area; + return dma_contiguous_default_area; +} + +void dma_contiguous_reserve(phys_addr_t addr_limit); +int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, + phys_addr_t limit, struct cma **res_cma, bool fixed); + +struct page *dma_alloc_from_contiguous(struct device *dev, size_t count, + unsigned int order, bool no_warn); +bool dma_release_from_contiguous(struct device *dev, struct page *pages, + int count); +struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp); +void dma_free_contiguous(struct device *dev, struct page *page, size_t size); + +void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size); +#else /* CONFIG_DMA_CMA */ +static inline struct cma *dev_get_cma_area(struct device *dev) +{ + return NULL; +} +static inline void dma_contiguous_reserve(phys_addr_t limit) +{ +} +static inline int dma_contiguous_reserve_area(phys_addr_t size, + phys_addr_t base, phys_addr_t limit, struct cma **res_cma, + bool fixed) +{ + return -ENOSYS; +} +static inline struct page *dma_alloc_from_contiguous(struct device *dev, + size_t count, unsigned int order, bool no_warn) +{ + return NULL; +} +static inline bool dma_release_from_contiguous(struct device *dev, + struct page *pages, int count) +{ + return false; +} +/* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */ +static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size, + gfp_t gfp) +{ + return NULL; +} +static inline void dma_free_contiguous(struct device *dev, struct page *page, + size_t size) +{ + __free_pages(page, get_order(size)); +} +#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); +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_alloc_from_global_coherent(struct device *dev, + ssize_t size, dma_addr_t *dma_handle) +{ + return NULL; +} +static inline int dma_release_from_global_coherent(int order, void *vaddr) +{ + return 0; +} +static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, + void *cpu_addr, size_t size, int *ret) +{ + return 0; +} +#endif /* CONFIG_DMA_DECLARE_COHERENT */ + +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); + +#ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H +#include <asm/dma-coherence.h> +#elif 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) +static inline bool dev_is_dma_coherent(struct device *dev) +{ + return dev->dma_coherent; +} +#else +static inline bool dev_is_dma_coherent(struct device *dev) +{ + return true; +} +#endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */ + +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_MMU +/* + * Page protection so that devices that can't snoop CPU caches can use the + * memory coherently. We default to pgprot_noncached which is usually used + * for ioremap as a safe bet, but architectures can override this with less + * strict semantics if possible. + */ +#ifndef pgprot_dmacoherent +#define pgprot_dmacoherent(prot) pgprot_noncached(prot) +#endif + +pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs); +#else +static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, + unsigned long attrs) +{ + return prot; /* no protection bits supported without page tables */ +} +#endif /* CONFIG_MMU */ + +#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE +void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, + enum dma_data_direction dir); +#else +static inline void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) +{ +} +#endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */ + +#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU +void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, + enum dma_data_direction dir); +#else +static inline void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) +{ +} +#endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */ + +#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL +void arch_sync_dma_for_cpu_all(void); +#else +static inline void arch_sync_dma_for_cpu_all(void) +{ +} +#endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */ + +#ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT +void arch_dma_prep_coherent(struct page *page, size_t size); +#else +static inline void arch_dma_prep_coherent(struct page *page, size_t size) +{ +} +#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */ + +#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN +void arch_dma_mark_clean(phys_addr_t paddr, size_t size); +#else +static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size) +{ +} +#endif /* ARCH_HAS_DMA_MARK_CLEAN */ + +void *arch_dma_set_uncached(void *addr, size_t size); +void arch_dma_clear_uncached(void *addr, size_t size); + +#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); +#else +static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, + u64 size, const struct iommu_ops *iommu, bool coherent) +{ +} +#endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */ + +#ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS +void arch_teardown_dma_ops(struct device *dev); +#else +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 debug_dma_dump_mappings(struct device *dev); +#else +static inline void dma_debug_add_bus(struct bus_type *bus) +{ +} +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 */ |