diff options
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 836 |
1 files changed, 678 insertions, 158 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 94af41858513..2ceda49c609f 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -1,225 +1,741 @@ +/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_DMA_MAPPING_H #define _LINUX_DMA_MAPPING_H -#include <linux/string.h> #include <linux/device.h> #include <linux/err.h> -#include <linux/dma-attrs.h> #include <linux/dma-direction.h> #include <linux/scatterlist.h> +#include <linux/bug.h> -struct dma_map_ops { - void* (*alloc)(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, - struct dma_attrs *attrs); - void (*free)(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle, - struct dma_attrs *attrs); - int (*mmap)(struct device *, struct vm_area_struct *, - void *, dma_addr_t, size_t, struct dma_attrs *attrs); - - int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *, - dma_addr_t, size_t, struct dma_attrs *attrs); - - dma_addr_t (*map_page)(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs); - void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction dir, - struct dma_attrs *attrs); - int (*map_sg)(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, - struct dma_attrs *attrs); - void (*unmap_sg)(struct device *dev, - struct scatterlist *sg, int nents, - enum dma_data_direction dir, - struct dma_attrs *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); - int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); - int (*dma_supported)(struct device *dev, u64 mask); - int (*set_dma_mask)(struct device *dev, u64 mask); -#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK - u64 (*get_required_mask)(struct device *dev); -#endif - int is_phys; -}; +/** + * List of possible attributes associated with a DMA mapping. The semantics + * of each attribute should be defined in Documentation/core-api/dma-attributes.rst. + */ -#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) +/* + * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping + * may be weakly ordered, that is that reads and writes may pass each other. + */ +#define DMA_ATTR_WEAK_ORDERING (1UL << 1) +/* + * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be + * buffered to improve performance. + */ +#define DMA_ATTR_WRITE_COMBINE (1UL << 2) +/* + * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel + * virtual mapping for the allocated buffer. + */ +#define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4) +/* + * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of + * the CPU cache for the given buffer assuming that it has been already + * transferred to 'device' domain. + */ +#define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5) +/* + * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer + * in physical memory. + */ +#define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6) +/* + * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem + * that it's probably not worth the time to try to allocate memory to in a way + * that gives better TLB efficiency. + */ +#define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7) +/* + * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress + * allocation failure reports (similarly to __GFP_NOWARN). + */ +#define DMA_ATTR_NO_WARN (1UL << 8) + +/* + * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully + * accessible at an elevated privilege level (and ideally inaccessible or + * at least read-only at lesser-privileged levels). + */ +#define DMA_ATTR_PRIVILEGED (1UL << 9) + +/* + * DMA_ATTR_MMIO - Indicates memory-mapped I/O (MMIO) region for DMA mapping + * + * This attribute indicates the physical address is not normal system + * memory. It may not be used with kmap*()/phys_to_virt()/phys_to_page() + * functions, it may not be cacheable, and access using CPU load/store + * instructions may not be allowed. + * + * Usually this will be used to describe MMIO addresses, or other non-cacheable + * register addresses. When DMA mapping this sort of address we call + * the operation Peer to Peer as a one device is DMA'ing to another device. + * For PCI devices the p2pdma APIs must be used to determine if DMA_ATTR_MMIO + * is appropriate. + * + * For architectures that require cache flushing for DMA coherence + * DMA_ATTR_MMIO will not perform any cache flushing. The address + * provided must never be mapped cacheable into the CPU. + */ +#define DMA_ATTR_MMIO (1UL << 10) + +/* + * A dma_addr_t can hold any valid DMA or bus address for the platform. It can + * be given to a device to use as a DMA source or target. It is specific to a + * given device and there may be a translation between the CPU physical address + * space and the bus address space. + * + * DMA_MAPPING_ERROR is the magic error code if a mapping failed. It should not + * be used directly in drivers, but checked for using dma_mapping_error() + * instead. + */ +#define DMA_MAPPING_ERROR (~(dma_addr_t)0) -#define DMA_MASK_NONE 0x0ULL +#define DMA_BIT_MASK(n) GENMASK_ULL(n - 1, 0) -static inline int valid_dma_direction(int dma_direction) +struct dma_iova_state { + dma_addr_t addr; + u64 __size; +}; + +/* + * Use the high bit to mark if we used swiotlb for one or more ranges. + */ +#define DMA_IOVA_USE_SWIOTLB (1ULL << 63) + +static inline size_t dma_iova_size(struct dma_iova_state *state) { - return ((dma_direction == DMA_BIDIRECTIONAL) || - (dma_direction == DMA_TO_DEVICE) || - (dma_direction == DMA_FROM_DEVICE)); + /* Casting is needed for 32-bits systems */ + return (size_t)(state->__size & ~DMA_IOVA_USE_SWIOTLB); } -static inline int is_device_dma_capable(struct device *dev) +#ifdef CONFIG_DMA_API_DEBUG +void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); +void debug_dma_map_single(struct device *dev, const void *addr, + unsigned long len); +#else +static inline void debug_dma_mapping_error(struct device *dev, + dma_addr_t dma_addr) { - return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; } +static inline void debug_dma_map_single(struct device *dev, const void *addr, + unsigned long len) +{ +} +#endif /* CONFIG_DMA_API_DEBUG */ #ifdef CONFIG_HAS_DMA -#include <asm/dma-mapping.h> -#else -#include <asm-generic/dma-mapping-broken.h> -#endif - -static inline u64 dma_get_mask(struct device *dev) +static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { - if (dev && dev->dma_mask && *dev->dma_mask) - return *dev->dma_mask; - return DMA_BIT_MASK(32); + debug_dma_mapping_error(dev, dma_addr); + + if (unlikely(dma_addr == DMA_MAPPING_ERROR)) + return -ENOMEM; + return 0; } -#ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK +dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page, + size_t offset, size_t size, enum dma_data_direction dir, + unsigned long attrs); +void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir, unsigned long attrs); +dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, size_t size, + enum dma_data_direction dir, unsigned long attrs); +void dma_unmap_phys(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir, unsigned long attrs); +unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, unsigned long attrs); +void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, + unsigned long attrs); +int dma_map_sgtable(struct device *dev, struct sg_table *sgt, + enum dma_data_direction dir, unsigned long attrs); +dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr, + size_t size, enum dma_data_direction dir, unsigned long attrs); +void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir, unsigned long attrs); +void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t flag, unsigned long attrs); +void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, + dma_addr_t dma_handle, unsigned long attrs); +void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t gfp, unsigned long attrs); +void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle); +int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs); +int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs); +bool dma_can_mmap(struct device *dev); +bool dma_pci_p2pdma_supported(struct device *dev); +int dma_set_mask(struct device *dev, u64 mask); int dma_set_coherent_mask(struct device *dev, u64 mask); -#else +u64 dma_get_required_mask(struct device *dev); +bool dma_addressing_limited(struct device *dev); +size_t dma_max_mapping_size(struct device *dev); +size_t dma_opt_mapping_size(struct device *dev); +unsigned long dma_get_merge_boundary(struct device *dev); +struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size, + enum dma_data_direction dir, gfp_t gfp, unsigned long attrs); +void dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, enum dma_data_direction dir); +void *dma_vmap_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt); +void dma_vunmap_noncontiguous(struct device *dev, void *vaddr); +int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, + size_t size, struct sg_table *sgt); +#else /* CONFIG_HAS_DMA */ +static inline dma_addr_t dma_map_page_attrs(struct device *dev, + struct page *page, size_t offset, size_t size, + enum dma_data_direction dir, unsigned long attrs) +{ + return DMA_MAPPING_ERROR; +} +static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ +} +static inline dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ + return DMA_MAPPING_ERROR; +} +static inline void dma_unmap_phys(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ +} +static inline unsigned int dma_map_sg_attrs(struct device *dev, + struct scatterlist *sg, int nents, enum dma_data_direction dir, + unsigned long attrs) +{ + return 0; +} +static inline void dma_unmap_sg_attrs(struct device *dev, + struct scatterlist *sg, int nents, enum dma_data_direction dir, + unsigned long attrs) +{ +} +static inline int dma_map_sgtable(struct device *dev, struct sg_table *sgt, + enum dma_data_direction dir, unsigned long attrs) +{ + return -EOPNOTSUPP; +} +static inline dma_addr_t dma_map_resource(struct device *dev, + phys_addr_t phys_addr, size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ + return DMA_MAPPING_ERROR; +} +static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ +} +static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return -ENOMEM; +} +static inline void *dma_alloc_attrs(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs) +{ + 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 *dmam_alloc_attrs(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) +{ + return NULL; +} +static inline void dmam_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ +} +static inline int dma_get_sgtable_attrs(struct device *dev, + struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, + size_t size, unsigned long attrs) +{ + return -ENXIO; +} +static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs) +{ + return -ENXIO; +} +static inline bool dma_can_mmap(struct device *dev) +{ + return false; +} +static inline bool dma_pci_p2pdma_supported(struct device *dev) +{ + return false; +} +static inline int dma_set_mask(struct device *dev, u64 mask) +{ + return -EIO; +} static inline int dma_set_coherent_mask(struct device *dev, u64 mask) { - if (!dma_supported(dev, mask)) - return -EIO; - dev->coherent_dma_mask = mask; + return -EIO; +} +static inline u64 dma_get_required_mask(struct device *dev) +{ return 0; } -#endif +static inline bool dma_addressing_limited(struct device *dev) +{ + return false; +} +static inline size_t dma_max_mapping_size(struct device *dev) +{ + return 0; +} +static inline size_t dma_opt_mapping_size(struct device *dev) +{ + return 0; +} +static inline unsigned long dma_get_merge_boundary(struct device *dev) +{ + return 0; +} +static inline struct sg_table *dma_alloc_noncontiguous(struct device *dev, + size_t size, enum dma_data_direction dir, gfp_t gfp, + unsigned long attrs) +{ + return NULL; +} +static inline void dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, enum dma_data_direction dir) +{ +} +static inline void *dma_vmap_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt) +{ + return NULL; +} +static inline void dma_vunmap_noncontiguous(struct device *dev, void *vaddr) +{ +} +static inline int dma_mmap_noncontiguous(struct device *dev, + struct vm_area_struct *vma, size_t size, struct sg_table *sgt) +{ + return -EINVAL; +} +#endif /* CONFIG_HAS_DMA */ + +#ifdef CONFIG_IOMMU_DMA +/** + * dma_use_iova - check if the IOVA API is used for this state + * @state: IOVA state + * + * Return %true if the DMA transfers uses the dma_iova_*() calls or %false if + * they can't be used. + */ +static inline bool dma_use_iova(struct dma_iova_state *state) +{ + return state->__size != 0; +} + +bool dma_iova_try_alloc(struct device *dev, struct dma_iova_state *state, + phys_addr_t phys, size_t size); +void dma_iova_free(struct device *dev, struct dma_iova_state *state); +void dma_iova_destroy(struct device *dev, struct dma_iova_state *state, + size_t mapped_len, enum dma_data_direction dir, + unsigned long attrs); +int dma_iova_sync(struct device *dev, struct dma_iova_state *state, + size_t offset, size_t size); +int dma_iova_link(struct device *dev, struct dma_iova_state *state, + phys_addr_t phys, size_t offset, size_t size, + enum dma_data_direction dir, unsigned long attrs); +void dma_iova_unlink(struct device *dev, struct dma_iova_state *state, + size_t offset, size_t size, enum dma_data_direction dir, + unsigned long attrs); +#else /* CONFIG_IOMMU_DMA */ +static inline bool dma_use_iova(struct dma_iova_state *state) +{ + return false; +} +static inline bool dma_iova_try_alloc(struct device *dev, + struct dma_iova_state *state, phys_addr_t phys, size_t size) +{ + return false; +} +static inline void dma_iova_free(struct device *dev, + struct dma_iova_state *state) +{ +} +static inline void dma_iova_destroy(struct device *dev, + struct dma_iova_state *state, size_t mapped_len, + enum dma_data_direction dir, unsigned long attrs) +{ +} +static inline int dma_iova_sync(struct device *dev, + struct dma_iova_state *state, size_t offset, size_t size) +{ + return -EOPNOTSUPP; +} +static inline int dma_iova_link(struct device *dev, + struct dma_iova_state *state, phys_addr_t phys, size_t offset, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ + return -EOPNOTSUPP; +} +static inline void dma_iova_unlink(struct device *dev, + struct dma_iova_state *state, size_t offset, size_t size, + enum dma_data_direction dir, unsigned long attrs) +{ +} +#endif /* CONFIG_IOMMU_DMA */ + +#if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC) +void __dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir); +void __dma_sync_single_for_device(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir); +void __dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, + int nelems, enum dma_data_direction dir); +void __dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, + int nelems, enum dma_data_direction dir); +bool __dma_need_sync(struct device *dev, dma_addr_t dma_addr); + +static inline bool dma_dev_need_sync(const struct device *dev) +{ + /* Always call DMA sync operations when debugging is enabled */ + return !dev->dma_skip_sync || IS_ENABLED(CONFIG_DMA_API_DEBUG); +} -extern u64 dma_get_required_mask(struct device *dev); +static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir) +{ + if (dma_dev_need_sync(dev)) + __dma_sync_single_for_cpu(dev, addr, size, dir); +} -static inline unsigned int dma_get_max_seg_size(struct device *dev) +static inline void dma_sync_single_for_device(struct device *dev, + dma_addr_t addr, size_t size, enum dma_data_direction dir) { - return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; + if (dma_dev_need_sync(dev)) + __dma_sync_single_for_device(dev, addr, size, dir); } -static inline unsigned int dma_set_max_seg_size(struct device *dev, - unsigned int size) +static inline void dma_sync_sg_for_cpu(struct device *dev, + struct scatterlist *sg, int nelems, enum dma_data_direction dir) { - if (dev->dma_parms) { - dev->dma_parms->max_segment_size = size; - return 0; - } else - return -EIO; + if (dma_dev_need_sync(dev)) + __dma_sync_sg_for_cpu(dev, sg, nelems, dir); } -static inline unsigned long dma_get_seg_boundary(struct device *dev) +static inline void dma_sync_sg_for_device(struct device *dev, + struct scatterlist *sg, int nelems, enum dma_data_direction dir) { - return dev->dma_parms ? - dev->dma_parms->segment_boundary_mask : 0xffffffff; + if (dma_dev_need_sync(dev)) + __dma_sync_sg_for_device(dev, sg, nelems, dir); } -static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) +static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) +{ + return dma_dev_need_sync(dev) ? __dma_need_sync(dev, dma_addr) : false; +} +bool dma_need_unmap(struct device *dev); +#else /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */ +static inline bool dma_dev_need_sync(const struct device *dev) +{ + return false; +} +static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir) +{ +} +static inline void dma_sync_single_for_device(struct device *dev, + dma_addr_t addr, size_t size, enum dma_data_direction dir) +{ +} +static inline void dma_sync_sg_for_cpu(struct device *dev, + struct scatterlist *sg, int nelems, enum dma_data_direction dir) +{ +} +static inline void dma_sync_sg_for_device(struct device *dev, + struct scatterlist *sg, int nelems, enum dma_data_direction dir) +{ +} +static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) { - if (dev->dma_parms) { - dev->dma_parms->segment_boundary_mask = mask; - return 0; - } else - return -EIO; + return false; } +static inline bool dma_need_unmap(struct device *dev) +{ + return false; +} +#endif /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */ -static inline void *dma_zalloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) +struct page *dma_alloc_pages(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); +void dma_free_pages(struct device *dev, size_t size, struct page *page, + dma_addr_t dma_handle, enum dma_data_direction dir); +int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, + size_t size, struct page *page); + +static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) { - void *ret = dma_alloc_coherent(dev, size, dma_handle, flag); - if (ret) - memset(ret, 0, size); - return ret; + struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); + return page ? page_address(page) : NULL; } -#ifdef CONFIG_HAS_DMA -static inline int dma_get_cache_alignment(void) +static inline void dma_free_noncoherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir) { -#ifdef ARCH_DMA_MINALIGN - return ARCH_DMA_MINALIGN; -#endif - return 1; + dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir); } -#endif -/* flags for the coherent memory api */ -#define DMA_MEMORY_MAP 0x01 -#define DMA_MEMORY_IO 0x02 -#define DMA_MEMORY_INCLUDES_CHILDREN 0x04 -#define DMA_MEMORY_EXCLUSIVE 0x08 +static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ + /* DMA must never operate on areas that might be remapped. */ + if (dev_WARN_ONCE(dev, is_vmalloc_addr(ptr), + "rejecting DMA map of vmalloc memory\n")) + return DMA_MAPPING_ERROR; + debug_dma_map_single(dev, ptr, size); + return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr), + size, dir, attrs); +} -#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY -static inline int -dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, - dma_addr_t device_addr, size_t size, int flags) +static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, unsigned long attrs) { - return 0; + return dma_unmap_page_attrs(dev, addr, size, dir, attrs); } -static inline void -dma_release_declared_memory(struct device *dev) +static inline void dma_sync_single_range_for_cpu(struct device *dev, + dma_addr_t addr, unsigned long offset, size_t size, + enum dma_data_direction dir) { + return dma_sync_single_for_cpu(dev, addr + offset, size, dir); } -static inline void * -dma_mark_declared_memory_occupied(struct device *dev, - dma_addr_t device_addr, size_t size) +static inline void dma_sync_single_range_for_device(struct device *dev, + dma_addr_t addr, unsigned long offset, size_t size, + enum dma_data_direction dir) { - return ERR_PTR(-EBUSY); + return dma_sync_single_for_device(dev, addr + offset, size, dir); +} + +/** + * dma_unmap_sgtable - Unmap the given buffer for DMA + * @dev: The device for which to perform the DMA operation + * @sgt: The sg_table object describing the buffer + * @dir: DMA direction + * @attrs: Optional DMA attributes for the unmap operation + * + * Unmaps a buffer described by a scatterlist stored in the given sg_table + * object for the @dir DMA operation by the @dev device. After this function + * the ownership of the buffer is transferred back to the CPU domain. + */ +static inline void dma_unmap_sgtable(struct device *dev, struct sg_table *sgt, + enum dma_data_direction dir, unsigned long attrs) +{ + dma_unmap_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs); +} + +/** + * dma_sync_sgtable_for_cpu - Synchronize the given buffer for CPU access + * @dev: The device for which to perform the DMA operation + * @sgt: The sg_table object describing the buffer + * @dir: DMA direction + * + * Performs the needed cache synchronization and moves the ownership of the + * buffer back to the CPU domain, so it is safe to perform any access to it + * by the CPU. Before doing any further DMA operations, one has to transfer + * the ownership of the buffer back to the DMA domain by calling the + * dma_sync_sgtable_for_device(). + */ +static inline void dma_sync_sgtable_for_cpu(struct device *dev, + struct sg_table *sgt, enum dma_data_direction dir) +{ + dma_sync_sg_for_cpu(dev, sgt->sgl, sgt->orig_nents, dir); +} + +/** + * dma_sync_sgtable_for_device - Synchronize the given buffer for DMA + * @dev: The device for which to perform the DMA operation + * @sgt: The sg_table object describing the buffer + * @dir: DMA direction + * + * Performs the needed cache synchronization and moves the ownership of the + * buffer back to the DMA domain, so it is safe to perform the DMA operation. + * Once finished, one has to call dma_sync_sgtable_for_cpu() or + * dma_unmap_sgtable(). + */ +static inline void dma_sync_sgtable_for_device(struct device *dev, + struct sg_table *sgt, enum dma_data_direction dir) +{ + dma_sync_sg_for_device(dev, sgt->sgl, sgt->orig_nents, dir); +} + +#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0) +#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) +#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) +#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) +#define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0) +#define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0) +#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0) +#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0) + +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size); + +static inline void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp) +{ + return dma_alloc_attrs(dev, size, dma_handle, gfp, + (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0); +} + +static inline void dma_free_coherent(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_handle) +{ + return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0); +} + + +static inline u64 dma_get_mask(struct device *dev) +{ + if (dev->dma_mask && *dev->dma_mask) + return *dev->dma_mask; + return DMA_BIT_MASK(32); +} + +/* + * Set both the DMA mask and the coherent DMA mask to the same thing. + * Note that we don't check the return value from dma_set_coherent_mask() + * as the DMA API guarantees that the coherent DMA mask can be set to + * the same or smaller than the streaming DMA mask. + */ +static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask) +{ + int rc = dma_set_mask(dev, mask); + if (rc == 0) + dma_set_coherent_mask(dev, mask); + return rc; } -#endif /* - * Managed DMA API - */ -extern void *dmam_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp); -extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle); -extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp); -extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle); -#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY -extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, - dma_addr_t device_addr, size_t size, - int flags); -extern void dmam_release_declared_memory(struct device *dev); -#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ -static inline int dmam_declare_coherent_memory(struct device *dev, - dma_addr_t bus_addr, dma_addr_t device_addr, - size_t size, gfp_t gfp) + * Similar to the above, except it deals with the case where the device + * does not have dev->dma_mask appropriately setup. + */ +static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) +{ + dev->dma_mask = &dev->coherent_dma_mask; + return dma_set_mask_and_coherent(dev, mask); +} + +static inline unsigned int dma_get_max_seg_size(struct device *dev) +{ + if (dev->dma_parms && dev->dma_parms->max_segment_size) + return dev->dma_parms->max_segment_size; + return SZ_64K; +} + +static inline void dma_set_max_seg_size(struct device *dev, unsigned int size) +{ + if (WARN_ON_ONCE(!dev->dma_parms)) + return; + dev->dma_parms->max_segment_size = size; +} + +static inline unsigned long dma_get_seg_boundary(struct device *dev) +{ + if (dev->dma_parms && dev->dma_parms->segment_boundary_mask) + return dev->dma_parms->segment_boundary_mask; + return ULONG_MAX; +} + +/** + * dma_get_seg_boundary_nr_pages - return the segment boundary in "page" units + * @dev: device to guery the boundary for + * @page_shift: ilog() of the IOMMU page size + * + * Return the segment boundary in IOMMU page units (which may be different from + * the CPU page size) for the passed in device. + * + * If @dev is NULL a boundary of U32_MAX is assumed, this case is just for + * non-DMA API callers. + */ +static inline unsigned long dma_get_seg_boundary_nr_pages(struct device *dev, + unsigned int page_shift) +{ + if (!dev) + return (U32_MAX >> page_shift) + 1; + return (dma_get_seg_boundary(dev) >> page_shift) + 1; +} + +static inline void dma_set_seg_boundary(struct device *dev, unsigned long mask) +{ + if (WARN_ON_ONCE(!dev->dma_parms)) + return; + dev->dma_parms->segment_boundary_mask = mask; +} + +static inline unsigned int dma_get_min_align_mask(struct device *dev) { + if (dev->dma_parms) + return dev->dma_parms->min_align_mask; return 0; } -static inline void dmam_release_declared_memory(struct device *dev) +static inline void dma_set_min_align_mask(struct device *dev, + unsigned int min_align_mask) +{ + if (WARN_ON_ONCE(!dev->dma_parms)) + return; + dev->dma_parms->min_align_mask = min_align_mask; +} + +#ifndef dma_get_cache_alignment +static inline int dma_get_cache_alignment(void) { +#ifdef ARCH_HAS_DMA_MINALIGN + return ARCH_DMA_MINALIGN; +#endif + return 1; } -#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ +#endif -#ifndef CONFIG_HAVE_DMA_ATTRS -struct dma_attrs; +static inline void *dmam_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp) +{ + return dmam_alloc_attrs(dev, size, dma_handle, gfp, + (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0); +} -#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ - dma_map_single(dev, cpu_addr, size, dir) +static inline void *dma_alloc_wc(struct device *dev, size_t size, + dma_addr_t *dma_addr, gfp_t gfp) +{ + unsigned long attrs = DMA_ATTR_WRITE_COMBINE; -#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ - dma_unmap_single(dev, dma_addr, size, dir) + if (gfp & __GFP_NOWARN) + attrs |= DMA_ATTR_NO_WARN; -#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ - dma_map_sg(dev, sgl, nents, dir) + return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs); +} -#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ - dma_unmap_sg(dev, sgl, nents, dir) +static inline void dma_free_wc(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_addr) +{ + return dma_free_attrs(dev, size, cpu_addr, dma_addr, + DMA_ATTR_WRITE_COMBINE); +} -#endif /* CONFIG_HAVE_DMA_ATTRS */ +static inline int dma_mmap_wc(struct device *dev, + struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, + size_t size) +{ + return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, + DMA_ATTR_WRITE_COMBINE); +} #ifdef CONFIG_NEED_DMA_MAP_STATE #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME @@ -231,10 +747,14 @@ struct dma_attrs; #else #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) -#define dma_unmap_addr(PTR, ADDR_NAME) (0) -#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) -#define dma_unmap_len(PTR, LEN_NAME) (0) -#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) +#define dma_unmap_addr(PTR, ADDR_NAME) \ + ({ typeof(PTR) __p __maybe_unused = PTR; 0; }) +#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) \ + do { typeof(PTR) __p __maybe_unused = PTR; } while (0) +#define dma_unmap_len(PTR, LEN_NAME) \ + ({ typeof(PTR) __p __maybe_unused = PTR; 0; }) +#define dma_unmap_len_set(PTR, LEN_NAME, VAL) \ + do { typeof(PTR) __p __maybe_unused = PTR; } while (0) #endif -#endif +#endif /* _LINUX_DMA_MAPPING_H */ |