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04abab6982
Although dma_map_sg returns 0 on error and it cannot return a value < 0, the function returns a signed integer. Most of the time, this function is used with a scatterlist structure. This structure uses an unsigned integer for the number of memory. A dma developer that has not read in detail DMA-API.txt, can wrongly return a value < 0 on error. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
318 lines
9.3 KiB
C
318 lines
9.3 KiB
C
#ifndef _LINUX_DMA_MAPPING_H
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#define _LINUX_DMA_MAPPING_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-attrs.h>
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#include <linux/dma-direction.h>
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#include <linux/scatterlist.h>
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/*
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* A dma_addr_t can hold any valid DMA or bus address for the platform.
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* It can be given to a device to use as a DMA source or target. A CPU cannot
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* reference a dma_addr_t directly because there may be translation between
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* its physical address space and the bus address space.
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*/
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struct dma_map_ops {
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void* (*alloc)(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp,
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struct dma_attrs *attrs);
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void (*free)(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle,
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struct dma_attrs *attrs);
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int (*mmap)(struct device *, struct vm_area_struct *,
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void *, dma_addr_t, size_t, struct dma_attrs *attrs);
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int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
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dma_addr_t, size_t, struct dma_attrs *attrs);
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dma_addr_t (*map_page)(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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struct dma_attrs *attrs);
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void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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/*
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* map_sg returns 0 on error and a value > 0 on success.
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* It should never return a value < 0.
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*/
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int (*map_sg)(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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void (*unmap_sg)(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir,
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struct dma_attrs *attrs);
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void (*sync_single_for_cpu)(struct device *dev,
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dma_addr_t dma_handle, size_t size,
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enum dma_data_direction dir);
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void (*sync_single_for_device)(struct device *dev,
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dma_addr_t dma_handle, size_t size,
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enum dma_data_direction dir);
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void (*sync_sg_for_cpu)(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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void (*sync_sg_for_device)(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
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int (*dma_supported)(struct device *dev, u64 mask);
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int (*set_dma_mask)(struct device *dev, u64 mask);
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#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
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u64 (*get_required_mask)(struct device *dev);
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#endif
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int is_phys;
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};
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#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
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#define DMA_MASK_NONE 0x0ULL
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static inline int valid_dma_direction(int dma_direction)
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{
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return ((dma_direction == DMA_BIDIRECTIONAL) ||
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(dma_direction == DMA_TO_DEVICE) ||
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(dma_direction == DMA_FROM_DEVICE));
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}
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static inline int is_device_dma_capable(struct device *dev)
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{
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return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
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}
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#ifdef CONFIG_HAS_DMA
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#include <asm/dma-mapping.h>
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#else
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#include <asm-generic/dma-mapping-broken.h>
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#endif
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static inline u64 dma_get_mask(struct device *dev)
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{
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if (dev && 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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#ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
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int dma_set_coherent_mask(struct device *dev, u64 mask);
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#else
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static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
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{
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if (!dma_supported(dev, mask))
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return -EIO;
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dev->coherent_dma_mask = mask;
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return 0;
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}
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#endif
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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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extern u64 dma_get_required_mask(struct device *dev);
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#ifndef arch_setup_dma_ops
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static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
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u64 size, struct iommu_ops *iommu,
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bool coherent) { }
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#endif
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#ifndef arch_teardown_dma_ops
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static inline void arch_teardown_dma_ops(struct device *dev) { }
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#endif
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static inline unsigned int dma_get_max_seg_size(struct device *dev)
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{
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return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
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}
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static inline unsigned int dma_set_max_seg_size(struct device *dev,
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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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} else
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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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return dev->dma_parms ?
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dev->dma_parms->segment_boundary_mask : 0xffffffff;
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}
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static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
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{
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if (dev->dma_parms) {
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dev->dma_parms->segment_boundary_mask = mask;
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return 0;
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} else
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return -EIO;
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}
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#ifndef dma_max_pfn
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static inline unsigned long dma_max_pfn(struct device *dev)
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{
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return *dev->dma_mask >> PAGE_SHIFT;
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}
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#endif
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static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag)
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{
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void *ret = dma_alloc_coherent(dev, size, dma_handle,
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flag | __GFP_ZERO);
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return ret;
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}
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#ifdef CONFIG_HAS_DMA
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static inline int dma_get_cache_alignment(void)
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{
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#ifdef ARCH_DMA_MINALIGN
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return ARCH_DMA_MINALIGN;
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#endif
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return 1;
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}
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#endif
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/* flags for the coherent memory api */
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#define DMA_MEMORY_MAP 0x01
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#define DMA_MEMORY_IO 0x02
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#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
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#define DMA_MEMORY_EXCLUSIVE 0x08
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#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
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static inline int
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dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
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dma_addr_t device_addr, size_t size, int flags)
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{
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return 0;
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}
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static inline void
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dma_release_declared_memory(struct device *dev)
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{
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}
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static inline void *
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dma_mark_declared_memory_occupied(struct device *dev,
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dma_addr_t device_addr, size_t size)
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{
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return ERR_PTR(-EBUSY);
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}
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#endif
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/*
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* Managed DMA API
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*/
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extern void *dmam_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp);
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extern 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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extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp);
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extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle);
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#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
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extern int dmam_declare_coherent_memory(struct device *dev,
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phys_addr_t phys_addr,
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dma_addr_t device_addr, size_t size,
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int flags);
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extern void dmam_release_declared_memory(struct device *dev);
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#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
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static inline int dmam_declare_coherent_memory(struct device *dev,
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phys_addr_t phys_addr, dma_addr_t device_addr,
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size_t size, gfp_t gfp)
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{
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return 0;
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}
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static inline void dmam_release_declared_memory(struct device *dev)
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{
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}
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#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
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#ifndef CONFIG_HAVE_DMA_ATTRS
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struct dma_attrs;
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#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
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dma_map_single(dev, cpu_addr, size, dir)
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#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
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dma_unmap_single(dev, dma_addr, size, dir)
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#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
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dma_map_sg(dev, sgl, nents, dir)
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#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
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dma_unmap_sg(dev, sgl, nents, dir)
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#else
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static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
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dma_addr_t *dma_addr, gfp_t gfp)
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{
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DEFINE_DMA_ATTRS(attrs);
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dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
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return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs);
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}
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static inline void dma_free_writecombine(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t dma_addr)
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{
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DEFINE_DMA_ATTRS(attrs);
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dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
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return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs);
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}
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static inline int dma_mmap_writecombine(struct device *dev,
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struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr,
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size_t size)
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{
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DEFINE_DMA_ATTRS(attrs);
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dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
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return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
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}
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#endif /* CONFIG_HAVE_DMA_ATTRS */
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#ifdef CONFIG_NEED_DMA_MAP_STATE
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#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
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#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
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#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
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#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
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#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
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#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
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#else
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#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
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#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
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#define dma_unmap_addr(PTR, ADDR_NAME) (0)
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#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
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#define dma_unmap_len(PTR, LEN_NAME) (0)
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#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
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#endif
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#endif
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