diff options
Diffstat (limited to 'kernel/include/asm-generic/dma-mapping-common.h')
| -rw-r--r-- | kernel/include/asm-generic/dma-mapping-common.h | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/kernel/include/asm-generic/dma-mapping-common.h b/kernel/include/asm-generic/dma-mapping-common.h new file mode 100644 index 000000000..940d5ec12 --- /dev/null +++ b/kernel/include/asm-generic/dma-mapping-common.h @@ -0,0 +1,240 @@ +#ifndef _ASM_GENERIC_DMA_MAPPING_H +#define _ASM_GENERIC_DMA_MAPPING_H + +#include <linux/kmemcheck.h> +#include <linux/bug.h> +#include <linux/scatterlist.h> +#include <linux/dma-debug.h> +#include <linux/dma-attrs.h> + +static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, + size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + dma_addr_t addr; + + kmemcheck_mark_initialized(ptr, size); + BUG_ON(!valid_dma_direction(dir)); + addr = ops->map_page(dev, virt_to_page(ptr), + (unsigned long)ptr & ~PAGE_MASK, size, + dir, attrs); + debug_dma_map_page(dev, virt_to_page(ptr), + (unsigned long)ptr & ~PAGE_MASK, size, + dir, addr, true); + return addr; +} + +static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, + size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->unmap_page) + ops->unmap_page(dev, addr, size, dir, attrs); + debug_dma_unmap_page(dev, addr, size, dir, true); +} + +/* + * dma_maps_sg_attrs returns 0 on error and > 0 on success. + * It should never return a value < 0. + */ +static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + int i, ents; + struct scatterlist *s; + + for_each_sg(sg, s, nents, i) + kmemcheck_mark_initialized(sg_virt(s), s->length); + BUG_ON(!valid_dma_direction(dir)); + ents = ops->map_sg(dev, sg, nents, dir, attrs); + BUG_ON(ents < 0); + debug_dma_map_sg(dev, sg, nents, ents, dir); + + return ents; +} + +static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + debug_dma_unmap_sg(dev, sg, nents, dir); + if (ops->unmap_sg) + ops->unmap_sg(dev, sg, nents, dir, attrs); +} + +static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, + size_t offset, size_t size, + enum dma_data_direction dir) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + dma_addr_t addr; + + kmemcheck_mark_initialized(page_address(page) + offset, size); + BUG_ON(!valid_dma_direction(dir)); + addr = ops->map_page(dev, page, offset, size, dir, NULL); + debug_dma_map_page(dev, page, offset, size, dir, addr, false); + + return addr; +} + +static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->unmap_page) + ops->unmap_page(dev, addr, size, dir, NULL); + debug_dma_unmap_page(dev, addr, size, dir, false); +} + +static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, + size_t size, + enum dma_data_direction dir) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->sync_single_for_cpu) + ops->sync_single_for_cpu(dev, addr, size, dir); + debug_dma_sync_single_for_cpu(dev, addr, size, dir); +} + +static inline void dma_sync_single_for_device(struct device *dev, + dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->sync_single_for_device) + ops->sync_single_for_device(dev, addr, size, dir); + debug_dma_sync_single_for_device(dev, addr, size, dir); +} + +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) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->sync_single_for_cpu) + ops->sync_single_for_cpu(dev, addr + offset, size, dir); + debug_dma_sync_single_range_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) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->sync_single_for_device) + ops->sync_single_for_device(dev, addr + offset, size, dir); + debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir); +} + +static inline void +dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, + int nelems, enum dma_data_direction dir) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->sync_sg_for_cpu) + ops->sync_sg_for_cpu(dev, sg, nelems, dir); + debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir); +} + +static inline void +dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, + int nelems, enum dma_data_direction dir) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->sync_sg_for_device) + ops->sync_sg_for_device(dev, sg, nelems, dir); + debug_dma_sync_sg_for_device(dev, sg, nelems, dir); + +} + +#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) +#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) +#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) +#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) + +extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size); + +void *dma_common_contiguous_remap(struct page *page, size_t size, + unsigned long vm_flags, + pgprot_t prot, const void *caller); + +void *dma_common_pages_remap(struct page **pages, size_t size, + unsigned long vm_flags, pgprot_t prot, + const void *caller); +void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags); + +/** + * dma_mmap_attrs - map a coherent DMA allocation into user space + * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices + * @vma: vm_area_struct describing requested user mapping + * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs + * @handle: device-view address returned from dma_alloc_attrs + * @size: size of memory originally requested in dma_alloc_attrs + * @attrs: attributes of mapping properties requested in dma_alloc_attrs + * + * Map a coherent DMA buffer previously allocated by dma_alloc_attrs + * into user space. The coherent DMA buffer must not be freed by the + * driver until the user space mapping has been released. + */ +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, struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + if (ops->mmap) + return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs); + return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); +} + +#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL) + +int +dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, + void *cpu_addr, dma_addr_t dma_addr, size_t size); + +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, struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + if (ops->get_sgtable) + return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size, + attrs); + return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size); +} + +#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL) + +#endif |