forked from mirrors/linux
be164349e1
Back in the day a lot of logic was implemented inline in dma-mapping.h and needed various includes. Move of this has long been moved out of line, so we can drop various includes to improve kernel rebuild times. Signed-off-by: Christoph Hellwig <hch@lst.de>
638 lines
21 KiB
C
638 lines
21 KiB
C
/* 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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#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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/**
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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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* 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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* 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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#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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if (unlikely(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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unsigned 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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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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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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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_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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bool dma_pci_p2pdma_supported(struct device *dev);
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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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bool dma_addressing_limited(struct device *dev);
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size_t dma_max_mapping_size(struct device *dev);
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size_t dma_opt_mapping_size(struct device *dev);
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unsigned long dma_get_merge_boundary(struct device *dev);
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struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
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enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
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void dma_free_noncontiguous(struct device *dev, size_t size,
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struct sg_table *sgt, enum dma_data_direction dir);
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void *dma_vmap_noncontiguous(struct device *dev, size_t size,
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struct sg_table *sgt);
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void dma_vunmap_noncontiguous(struct device *dev, void *vaddr);
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int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
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size_t size, struct sg_table *sgt);
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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 unsigned int dma_map_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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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 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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return -EOPNOTSUPP;
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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 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 bool dma_pci_p2pdma_supported(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_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 bool dma_addressing_limited(struct device *dev)
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{
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return false;
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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 size_t dma_opt_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 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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static inline struct sg_table *dma_alloc_noncontiguous(struct device *dev,
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size_t size, enum dma_data_direction dir, gfp_t gfp,
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unsigned long attrs)
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{
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return NULL;
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}
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static inline void dma_free_noncontiguous(struct device *dev, size_t size,
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struct sg_table *sgt, enum dma_data_direction dir)
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{
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}
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static inline void *dma_vmap_noncontiguous(struct device *dev, size_t size,
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struct sg_table *sgt)
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{
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return NULL;
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}
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static inline void dma_vunmap_noncontiguous(struct device *dev, void *vaddr)
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{
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}
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static inline int dma_mmap_noncontiguous(struct device *dev,
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struct vm_area_struct *vma, size_t size, struct sg_table *sgt)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_HAS_DMA */
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#if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC)
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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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bool __dma_need_sync(struct device *dev, dma_addr_t dma_addr);
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static inline bool dma_dev_need_sync(const struct device *dev)
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{
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/* Always call DMA sync operations when debugging is enabled */
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return !dev->dma_skip_sync || IS_ENABLED(CONFIG_DMA_API_DEBUG);
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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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if (dma_dev_need_sync(dev))
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__dma_sync_single_for_cpu(dev, addr, size, dir);
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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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if (dma_dev_need_sync(dev))
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__dma_sync_single_for_device(dev, addr, size, dir);
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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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if (dma_dev_need_sync(dev))
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__dma_sync_sg_for_cpu(dev, sg, nelems, dir);
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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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if (dma_dev_need_sync(dev))
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__dma_sync_sg_for_device(dev, sg, nelems, dir);
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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 dma_dev_need_sync(dev) ? __dma_need_sync(dev, dma_addr) : false;
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}
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#else /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */
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static inline bool dma_dev_need_sync(const struct device *dev)
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{
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return false;
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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 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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#endif /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */
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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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int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
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size_t size, struct page *page);
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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_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
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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 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
|
|
|
|
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 */
|