| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_DMA_MAPPING_H |
| #define _LINUX_DMA_MAPPING_H |
| |
| #include <linux/sizes.h> |
| #include <linux/string.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/dma-direction.h> |
| #include <linux/scatterlist.h> |
| #include <linux/bug.h> |
| #include <linux/mem_encrypt.h> |
| |
| /** |
| * List of possible attributes associated with a DMA mapping. The semantics |
| * of each attribute should be defined in Documentation/core-api/dma-attributes.rst. |
| */ |
| |
| /* |
| * 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) |
| |
| /* |
| * 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_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) |
| |
| #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) |
| { |
| } |
| 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 |
| static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| { |
| debug_dma_mapping_error(dev, dma_addr); |
| |
| if (dma_addr == DMA_MAPPING_ERROR) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| 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); |
| 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); |
| 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_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); |
| 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); |
| int dma_supported(struct device *dev, u64 mask); |
| int dma_set_mask(struct device *dev, u64 mask); |
| int dma_set_coherent_mask(struct device *dev, u64 mask); |
| u64 dma_get_required_mask(struct device *dev); |
| size_t dma_max_mapping_size(struct device *dev); |
| bool dma_need_sync(struct device *dev, dma_addr_t dma_addr); |
| unsigned long dma_get_merge_boundary(struct device *dev); |
| #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 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 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 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 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 int dma_supported(struct device *dev, u64 mask) |
| { |
| return 0; |
| } |
| 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) |
| { |
| return -EIO; |
| } |
| static inline u64 dma_get_required_mask(struct device *dev) |
| { |
| return 0; |
| } |
| static inline size_t dma_max_mapping_size(struct device *dev) |
| { |
| return 0; |
| } |
| static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) |
| { |
| return false; |
| } |
| static inline unsigned long dma_get_merge_boundary(struct device *dev) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_HAS_DMA */ |
| |
| 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); |
| |
| 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) |
| { |
| struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); |
| return page ? page_address(page) : NULL; |
| } |
| |
| static inline void dma_free_noncoherent(struct device *dev, size_t size, |
| void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir) |
| { |
| dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir); |
| } |
| |
| 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); |
| } |
| |
| 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 dma_unmap_page_attrs(dev, addr, size, dir, attrs); |
| } |
| |
| 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_sync_single_range_for_device(struct device *dev, |
| dma_addr_t addr, unsigned long offset, size_t size, |
| enum dma_data_direction dir) |
| { |
| return dma_sync_single_for_device(dev, addr + offset, size, dir); |
| } |
| |
| /** |
| * dma_map_sgtable - Map 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 map operation |
| * |
| * Maps a buffer described by a scatterlist stored in the given sg_table |
| * object for the @dir DMA operation by the @dev device. After success the |
| * ownership for the buffer is transferred to the DMA domain. One has to |
| * call dma_sync_sgtable_for_cpu() or dma_unmap_sgtable() to move the |
| * ownership of the buffer back to the CPU domain before touching the |
| * buffer by the CPU. |
| * |
| * Returns 0 on success or -EINVAL on error during mapping the buffer. |
| */ |
| static inline int dma_map_sgtable(struct device *dev, struct sg_table *sgt, |
| enum dma_data_direction dir, unsigned long attrs) |
| { |
| int nents; |
| |
| nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs); |
| if (nents <= 0) |
| return -EINVAL; |
| sgt->nents = nents; |
| return 0; |
| } |
| |
| /** |
| * 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) |
| |
| 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); |
| } |
| |
| /** |
| * dma_addressing_limited - return if the device is addressing limited |
| * @dev: device to check |
| * |
| * Return %true if the devices DMA mask is too small to address all memory in |
| * the system, else %false. Lack of addressing bits is the prime reason for |
| * bounce buffering, but might not be the only one. |
| */ |
| static inline bool dma_addressing_limited(struct device *dev) |
| { |
| return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) < |
| dma_get_required_mask(dev); |
| } |
| |
| 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 int dma_set_max_seg_size(struct device *dev, unsigned int size) |
| { |
| if (dev->dma_parms) { |
| dev->dma_parms->max_segment_size = size; |
| return 0; |
| } |
| return -EIO; |
| } |
| |
| 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 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 */ |