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586 lines
19 KiB
586 lines
19 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_DMA_MAPPING_H |
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#define _LINUX_DMA_MAPPING_H |
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|
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#include <linux/sizes.h> |
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#include <linux/string.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/dma-direction.h> |
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#include <linux/scatterlist.h> |
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#include <linux/bug.h> |
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#include <linux/mem_encrypt.h> |
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|
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/** |
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* List of possible attributes associated with a DMA mapping. The semantics |
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* of each attribute should be defined in Documentation/core-api/dma-attributes.rst. |
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*/ |
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|
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/* |
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* DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping |
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* may be weakly ordered, that is that reads and writes may pass each other. |
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*/ |
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#define DMA_ATTR_WEAK_ORDERING (1UL << 1) |
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/* |
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* DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be |
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* buffered to improve performance. |
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*/ |
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#define DMA_ATTR_WRITE_COMBINE (1UL << 2) |
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/* |
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* DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel |
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* virtual mapping for the allocated buffer. |
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*/ |
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#define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4) |
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/* |
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* DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of |
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* the CPU cache for the given buffer assuming that it has been already |
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* transferred to 'device' domain. |
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*/ |
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#define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5) |
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/* |
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* DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer |
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* in physical memory. |
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*/ |
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#define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6) |
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/* |
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* DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem |
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* that it's probably not worth the time to try to allocate memory to in a way |
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* that gives better TLB efficiency. |
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*/ |
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#define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7) |
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/* |
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* DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress |
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* allocation failure reports (similarly to __GFP_NOWARN). |
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*/ |
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#define DMA_ATTR_NO_WARN (1UL << 8) |
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/* |
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* DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully |
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* accessible at an elevated privilege level (and ideally inaccessible or |
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* at least read-only at lesser-privileged levels). |
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*/ |
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#define DMA_ATTR_PRIVILEGED (1UL << 9) |
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|
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/* |
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* A dma_addr_t can hold any valid DMA or bus address for the platform. It can |
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* be given to a device to use as a DMA source or target. It is specific to a |
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* given device and there may be a translation between the CPU physical address |
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* space and the bus address space. |
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* |
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* DMA_MAPPING_ERROR is the magic error code if a mapping failed. It should not |
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* be used directly in drivers, but checked for using dma_mapping_error() |
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* instead. |
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*/ |
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#define DMA_MAPPING_ERROR (~(dma_addr_t)0) |
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|
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#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) |
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#ifdef CONFIG_DMA_API_DEBUG |
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void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); |
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void debug_dma_map_single(struct device *dev, const void *addr, |
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unsigned long len); |
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#else |
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static inline void debug_dma_mapping_error(struct device *dev, |
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dma_addr_t dma_addr) |
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{ |
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} |
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static inline void debug_dma_map_single(struct device *dev, const void *addr, |
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unsigned long len) |
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{ |
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} |
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#endif /* CONFIG_DMA_API_DEBUG */ |
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#ifdef CONFIG_HAS_DMA |
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static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
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{ |
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debug_dma_mapping_error(dev, dma_addr); |
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|
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if (dma_addr == DMA_MAPPING_ERROR) |
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return -ENOMEM; |
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return 0; |
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} |
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dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page, |
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size_t offset, size_t size, enum dma_data_direction dir, |
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unsigned long attrs); |
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void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size, |
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enum dma_data_direction dir, unsigned long attrs); |
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int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, |
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enum dma_data_direction dir, unsigned long attrs); |
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void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, |
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int nents, enum dma_data_direction dir, |
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unsigned long attrs); |
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dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr, |
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size_t size, enum dma_data_direction dir, unsigned long attrs); |
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void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size, |
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enum dma_data_direction dir, unsigned long attrs); |
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void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, |
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enum dma_data_direction dir); |
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void dma_sync_single_for_device(struct device *dev, dma_addr_t addr, |
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size_t size, enum dma_data_direction dir); |
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void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
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int nelems, enum dma_data_direction dir); |
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void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
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int nelems, enum dma_data_direction dir); |
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void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, |
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gfp_t flag, unsigned long attrs); |
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void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, |
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dma_addr_t dma_handle, unsigned long attrs); |
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void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, |
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gfp_t gfp, unsigned long attrs); |
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void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, |
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dma_addr_t dma_handle); |
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int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, |
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void *cpu_addr, dma_addr_t dma_addr, size_t size, |
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unsigned long attrs); |
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int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, |
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void *cpu_addr, dma_addr_t dma_addr, size_t size, |
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unsigned long attrs); |
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bool dma_can_mmap(struct device *dev); |
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int dma_supported(struct device *dev, u64 mask); |
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int dma_set_mask(struct device *dev, u64 mask); |
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int dma_set_coherent_mask(struct device *dev, u64 mask); |
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u64 dma_get_required_mask(struct device *dev); |
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size_t dma_max_mapping_size(struct device *dev); |
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bool dma_need_sync(struct device *dev, dma_addr_t dma_addr); |
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unsigned long dma_get_merge_boundary(struct device *dev); |
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#else /* CONFIG_HAS_DMA */ |
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static inline dma_addr_t dma_map_page_attrs(struct device *dev, |
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struct page *page, size_t offset, size_t size, |
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enum dma_data_direction dir, unsigned long attrs) |
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{ |
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return DMA_MAPPING_ERROR; |
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} |
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static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, |
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size_t size, enum dma_data_direction dir, unsigned long attrs) |
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{ |
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} |
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static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, |
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int nents, enum dma_data_direction dir, unsigned long attrs) |
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{ |
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return 0; |
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} |
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static inline void dma_unmap_sg_attrs(struct device *dev, |
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struct scatterlist *sg, int nents, enum dma_data_direction dir, |
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unsigned long attrs) |
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{ |
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} |
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static inline dma_addr_t dma_map_resource(struct device *dev, |
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phys_addr_t phys_addr, size_t size, enum dma_data_direction dir, |
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unsigned long attrs) |
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{ |
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return DMA_MAPPING_ERROR; |
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} |
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static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr, |
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size_t size, enum dma_data_direction dir, unsigned long attrs) |
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{ |
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} |
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static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, |
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size_t size, enum dma_data_direction dir) |
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{ |
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} |
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static inline void dma_sync_single_for_device(struct device *dev, |
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dma_addr_t addr, size_t size, enum dma_data_direction dir) |
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{ |
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} |
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static inline void dma_sync_sg_for_cpu(struct device *dev, |
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struct scatterlist *sg, int nelems, enum dma_data_direction dir) |
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{ |
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} |
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static inline void dma_sync_sg_for_device(struct device *dev, |
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struct scatterlist *sg, int nelems, enum dma_data_direction dir) |
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{ |
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} |
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static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
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{ |
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return -ENOMEM; |
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} |
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static inline void *dma_alloc_attrs(struct device *dev, size_t size, |
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dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs) |
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{ |
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return NULL; |
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} |
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static void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, |
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dma_addr_t dma_handle, unsigned long attrs) |
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{ |
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} |
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static inline void *dmam_alloc_attrs(struct device *dev, size_t size, |
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) |
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{ |
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return NULL; |
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} |
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static inline void dmam_free_coherent(struct device *dev, size_t size, |
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void *vaddr, dma_addr_t dma_handle) |
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{ |
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} |
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static inline int dma_get_sgtable_attrs(struct device *dev, |
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struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, |
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size_t size, unsigned long attrs) |
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{ |
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return -ENXIO; |
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} |
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static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, |
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void *cpu_addr, dma_addr_t dma_addr, size_t size, |
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unsigned long attrs) |
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{ |
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return -ENXIO; |
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} |
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static inline bool dma_can_mmap(struct device *dev) |
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{ |
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return false; |
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} |
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static inline int dma_supported(struct device *dev, u64 mask) |
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{ |
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return 0; |
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} |
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static inline int dma_set_mask(struct device *dev, u64 mask) |
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{ |
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return -EIO; |
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} |
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static inline int dma_set_coherent_mask(struct device *dev, u64 mask) |
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{ |
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return -EIO; |
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} |
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static inline u64 dma_get_required_mask(struct device *dev) |
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{ |
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return 0; |
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} |
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static inline size_t dma_max_mapping_size(struct device *dev) |
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{ |
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return 0; |
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} |
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static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) |
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{ |
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return false; |
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} |
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static inline unsigned long dma_get_merge_boundary(struct device *dev) |
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{ |
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return 0; |
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} |
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#endif /* CONFIG_HAS_DMA */ |
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struct page *dma_alloc_pages(struct device *dev, size_t size, |
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dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); |
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void dma_free_pages(struct device *dev, size_t size, struct page *page, |
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dma_addr_t dma_handle, enum dma_data_direction dir); |
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static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, |
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dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) |
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{ |
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struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); |
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return page ? page_address(page) : NULL; |
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} |
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static inline void dma_free_noncoherent(struct device *dev, size_t size, |
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void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir) |
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{ |
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dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir); |
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} |
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static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, |
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size_t size, enum dma_data_direction dir, unsigned long attrs) |
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{ |
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/* DMA must never operate on areas that might be remapped. */ |
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if (dev_WARN_ONCE(dev, is_vmalloc_addr(ptr), |
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"rejecting DMA map of vmalloc memory\n")) |
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return DMA_MAPPING_ERROR; |
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debug_dma_map_single(dev, ptr, size); |
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return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr), |
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size, dir, attrs); |
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} |
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static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, |
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size_t size, enum dma_data_direction dir, unsigned long attrs) |
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{ |
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return dma_unmap_page_attrs(dev, addr, size, dir, attrs); |
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} |
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static inline void dma_sync_single_range_for_cpu(struct device *dev, |
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dma_addr_t addr, unsigned long offset, size_t size, |
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enum dma_data_direction dir) |
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{ |
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return dma_sync_single_for_cpu(dev, addr + offset, size, dir); |
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} |
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static inline void dma_sync_single_range_for_device(struct device *dev, |
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dma_addr_t addr, unsigned long offset, size_t size, |
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enum dma_data_direction dir) |
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{ |
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return dma_sync_single_for_device(dev, addr + offset, size, dir); |
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} |
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/** |
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* dma_map_sgtable - Map the given buffer for DMA |
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* @dev: The device for which to perform the DMA operation |
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* @sgt: The sg_table object describing the buffer |
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* @dir: DMA direction |
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* @attrs: Optional DMA attributes for the map operation |
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* |
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* Maps a buffer described by a scatterlist stored in the given sg_table |
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* object for the @dir DMA operation by the @dev device. After success the |
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* ownership for the buffer is transferred to the DMA domain. One has to |
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* call dma_sync_sgtable_for_cpu() or dma_unmap_sgtable() to move the |
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* ownership of the buffer back to the CPU domain before touching the |
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* buffer by the CPU. |
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* |
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* Returns 0 on success or -EINVAL on error during mapping the buffer. |
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*/ |
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static inline int dma_map_sgtable(struct device *dev, struct sg_table *sgt, |
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enum dma_data_direction dir, unsigned long attrs) |
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{ |
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int nents; |
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nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs); |
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if (nents <= 0) |
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return -EINVAL; |
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sgt->nents = nents; |
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return 0; |
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} |
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/** |
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* dma_unmap_sgtable - Unmap the given buffer for DMA |
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* @dev: The device for which to perform the DMA operation |
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* @sgt: The sg_table object describing the buffer |
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* @dir: DMA direction |
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* @attrs: Optional DMA attributes for the unmap operation |
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* |
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* Unmaps a buffer described by a scatterlist stored in the given sg_table |
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* object for the @dir DMA operation by the @dev device. After this function |
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* the ownership of the buffer is transferred back to the CPU domain. |
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*/ |
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static inline void dma_unmap_sgtable(struct device *dev, struct sg_table *sgt, |
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enum dma_data_direction dir, unsigned long attrs) |
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{ |
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dma_unmap_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs); |
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} |
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/** |
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* dma_sync_sgtable_for_cpu - Synchronize the given buffer for CPU access |
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* @dev: The device for which to perform the DMA operation |
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* @sgt: The sg_table object describing the buffer |
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* @dir: DMA direction |
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* |
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* Performs the needed cache synchronization and moves the ownership of the |
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* buffer back to the CPU domain, so it is safe to perform any access to it |
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* by the CPU. Before doing any further DMA operations, one has to transfer |
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* the ownership of the buffer back to the DMA domain by calling the |
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* dma_sync_sgtable_for_device(). |
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*/ |
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static inline void dma_sync_sgtable_for_cpu(struct device *dev, |
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struct sg_table *sgt, enum dma_data_direction dir) |
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{ |
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dma_sync_sg_for_cpu(dev, sgt->sgl, sgt->orig_nents, dir); |
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} |
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/** |
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* dma_sync_sgtable_for_device - Synchronize the given buffer for DMA |
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* @dev: The device for which to perform the DMA operation |
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* @sgt: The sg_table object describing the buffer |
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* @dir: DMA direction |
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* |
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* Performs the needed cache synchronization and moves the ownership of the |
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* buffer back to the DMA domain, so it is safe to perform the DMA operation. |
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* Once finished, one has to call dma_sync_sgtable_for_cpu() or |
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* dma_unmap_sgtable(). |
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*/ |
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static inline void dma_sync_sgtable_for_device(struct device *dev, |
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struct sg_table *sgt, enum dma_data_direction dir) |
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{ |
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dma_sync_sg_for_device(dev, sgt->sgl, sgt->orig_nents, dir); |
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} |
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#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0) |
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#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) |
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#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) |
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#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) |
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#define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0) |
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#define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0) |
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#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0) |
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#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0) |
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static inline void *dma_alloc_coherent(struct device *dev, size_t size, |
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dma_addr_t *dma_handle, gfp_t gfp) |
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{ |
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return dma_alloc_attrs(dev, size, dma_handle, gfp, |
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(gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0); |
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} |
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static inline void dma_free_coherent(struct device *dev, size_t size, |
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void *cpu_addr, dma_addr_t dma_handle) |
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{ |
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return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0); |
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} |
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static inline u64 dma_get_mask(struct device *dev) |
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{ |
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if (dev->dma_mask && *dev->dma_mask) |
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return *dev->dma_mask; |
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return DMA_BIT_MASK(32); |
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} |
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/* |
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* Set both the DMA mask and the coherent DMA mask to the same thing. |
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* Note that we don't check the return value from dma_set_coherent_mask() |
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* as the DMA API guarantees that the coherent DMA mask can be set to |
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* the same or smaller than the streaming DMA mask. |
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*/ |
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static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask) |
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{ |
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int rc = dma_set_mask(dev, mask); |
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if (rc == 0) |
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dma_set_coherent_mask(dev, mask); |
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return rc; |
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} |
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/* |
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* Similar to the above, except it deals with the case where the device |
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* does not have dev->dma_mask appropriately setup. |
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*/ |
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static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) |
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{ |
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dev->dma_mask = &dev->coherent_dma_mask; |
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return dma_set_mask_and_coherent(dev, mask); |
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} |
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|
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/** |
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* dma_addressing_limited - return if the device is addressing limited |
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* @dev: device to check |
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* |
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* Return %true if the devices DMA mask is too small to address all memory in |
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* the system, else %false. Lack of addressing bits is the prime reason for |
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* bounce buffering, but might not be the only one. |
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*/ |
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static inline bool dma_addressing_limited(struct device *dev) |
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{ |
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return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) < |
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dma_get_required_mask(dev); |
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} |
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static inline unsigned int dma_get_max_seg_size(struct device *dev) |
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{ |
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if (dev->dma_parms && dev->dma_parms->max_segment_size) |
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return dev->dma_parms->max_segment_size; |
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return SZ_64K; |
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} |
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static inline int dma_set_max_seg_size(struct device *dev, unsigned int size) |
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{ |
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if (dev->dma_parms) { |
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dev->dma_parms->max_segment_size = size; |
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return 0; |
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} |
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return -EIO; |
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} |
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static inline unsigned long dma_get_seg_boundary(struct device *dev) |
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{ |
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if (dev->dma_parms && dev->dma_parms->segment_boundary_mask) |
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return dev->dma_parms->segment_boundary_mask; |
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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 int dma_set_seg_boundary(struct device *dev, unsigned long mask) |
|
{ |
|
if (dev->dma_parms) { |
|
dev->dma_parms->segment_boundary_mask = mask; |
|
return 0; |
|
} |
|
return -EIO; |
|
} |
|
|
|
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 int dma_set_min_align_mask(struct device *dev, |
|
unsigned int min_align_mask) |
|
{ |
|
if (WARN_ON_ONCE(!dev->dma_parms)) |
|
return -EIO; |
|
dev->dma_parms->min_align_mask = min_align_mask; |
|
return 0; |
|
} |
|
|
|
static inline int dma_get_cache_alignment(void) |
|
{ |
|
#ifdef ARCH_DMA_MINALIGN |
|
return ARCH_DMA_MINALIGN; |
|
#endif |
|
return 1; |
|
} |
|
|
|
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); |
|
} |
|
|
|
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; |
|
|
|
if (gfp & __GFP_NOWARN) |
|
attrs |= DMA_ATTR_NO_WARN; |
|
|
|
return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs); |
|
} |
|
|
|
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); |
|
} |
|
|
|
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 |
|
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME |
|
#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME) |
|
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL)) |
|
#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME) |
|
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL)) |
|
#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) |
|
#endif |
|
|
|
#endif /* _LINUX_DMA_MAPPING_H */
|
|
|