diff options
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index e5389bc981ee..b132174d5658 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -1577,121 +1577,6 @@ static int __dma_direction_to_prot(enum dma_data_direction dir) return prot; } -/* - * Map a part of the scatter-gather list into contiguous io address space - */ -static int __map_sg_chunk(struct device *dev, struct scatterlist *sg, - size_t size, dma_addr_t *handle, - enum dma_data_direction dir, struct dma_attrs *attrs, - bool is_coherent) -{ - struct dma_iommu_mapping *mapping = dev->archdata.mapping; - dma_addr_t iova, iova_base; - int ret = 0; - unsigned int count; - struct scatterlist *s; - int prot; - - size = PAGE_ALIGN(size); - *handle = DMA_ERROR_CODE; - - iova_base = iova = __alloc_iova(mapping, size); - if (iova == DMA_ERROR_CODE) - return -ENOMEM; - - for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) { - phys_addr_t phys = page_to_phys(sg_page(s)); - unsigned int len = PAGE_ALIGN(s->offset + s->length); - - if (!is_coherent && - !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) - __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, - dir); - - prot = __dma_direction_to_prot(dir); - if (!dma_get_attr(DMA_ATTR_EXEC_MAPPING, attrs)) - prot |= IOMMU_NOEXEC; - - ret = iommu_map(mapping->domain, iova, phys, len, prot); - if (ret < 0) - goto fail; - count += len >> PAGE_SHIFT; - iova += len; - } - *handle = iova_base; - - return 0; -fail: - iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE); - __free_iova(mapping, iova_base, size); - return ret; -} - -static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents, - enum dma_data_direction dir, struct dma_attrs *attrs, - bool is_coherent) -{ - struct scatterlist *s = sg, *dma = sg, *start = sg; - int i, count = 0; - unsigned int offset = s->offset; - unsigned int size = s->offset + s->length; - unsigned int max = dma_get_max_seg_size(dev); - - for (i = 1; i < nents; i++) { - s = sg_next(s); - - s->dma_address = DMA_ERROR_CODE; - s->dma_length = 0; - - if (s->offset || (size & ~PAGE_MASK) - || size + s->length > max) { - if (__map_sg_chunk(dev, start, size, &dma->dma_address, - dir, attrs, is_coherent) < 0) - goto bad_mapping; - - dma->dma_address += offset; - dma->dma_length = size - offset; - - size = offset = s->offset; - start = s; - dma = sg_next(dma); - count += 1; - } - size += s->length; - } - if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs, - is_coherent) < 0) - goto bad_mapping; - - dma->dma_address += offset; - dma->dma_length = size - offset; - - return count+1; - -bad_mapping: - for_each_sg(sg, s, count, i) - __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s)); - return 0; -} - -/** - * arm_coherent_iommu_map_sg - map a set of SG buffers for streaming mode DMA - * @dev: valid struct device pointer - * @sg: list of buffers - * @nents: number of buffers to map - * @dir: DMA transfer direction - * - * Map a set of i/o coherent buffers described by scatterlist in streaming - * mode for DMA. The scatter gather list elements are merged together (if - * possible) and tagged with the appropriate dma address and length. They are - * obtained via sg_dma_{address,length}. - */ -int arm_coherent_iommu_map_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, struct dma_attrs *attrs) -{ - return __iommu_map_sg(dev, sg, nents, dir, attrs, true); -} - /** * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA * @dev: valid struct device pointer @@ -1741,40 +1626,6 @@ int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, return nents; } -static void __iommu_unmap_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, struct dma_attrs *attrs, - bool is_coherent) -{ - struct scatterlist *s; - int i; - - for_each_sg(sg, s, nents, i) { - if (sg_dma_len(s)) - __iommu_remove_mapping(dev, sg_dma_address(s), - sg_dma_len(s)); - if (!is_coherent && - !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) - __dma_page_dev_to_cpu(sg_page(s), s->offset, - s->length, dir); - } -} - -/** - * arm_coherent_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg - * @dev: valid struct device pointer - * @sg: list of buffers - * @nents: number of buffers to unmap (same as was passed to dma_map_sg) - * @dir: DMA transfer direction (same as was passed to dma_map_sg) - * - * Unmap a set of streaming mode DMA translations. Again, CPU access - * rules concerning calls here are the same as for dma_unmap_single(). - */ -void arm_coherent_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, struct dma_attrs *attrs) -{ - __iommu_unmap_sg(dev, sg, nents, dir, attrs, true); -} - /** * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg * @dev: valid struct device pointer @@ -1893,31 +1744,6 @@ static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page, } /** - * arm_coherent_iommu_unmap_page - * @dev: valid struct device pointer - * @handle: DMA address of buffer - * @size: size of buffer (same as passed to dma_map_page) - * @dir: DMA transfer direction (same as passed to dma_map_page) - * - * Coherent IOMMU aware version of arm_dma_unmap_page() - */ -static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle, - size_t size, enum dma_data_direction dir, - struct dma_attrs *attrs) -{ - struct dma_iommu_mapping *mapping = dev->archdata.mapping; - dma_addr_t iova = handle & PAGE_MASK; - int offset = handle & ~PAGE_MASK; - int len = PAGE_ALIGN(size + offset); - - if (!iova) - return; - - iommu_unmap(mapping->domain, iova, len); - __free_iova(mapping, iova, len); -} - -/** * arm_iommu_unmap_page * @dev: valid struct device pointer * @handle: DMA address of buffer @@ -2016,22 +1842,6 @@ const struct dma_map_ops iommu_ops = { .mapping_error = arm_iommu_mapping_error, }; -const struct dma_map_ops iommu_coherent_ops = { - .alloc = arm_iommu_alloc_attrs, - .free = arm_iommu_free_attrs, - .mmap = arm_iommu_mmap_attrs, - .get_sgtable = arm_iommu_get_sgtable, - - .map_page = arm_coherent_iommu_map_page, - .unmap_page = arm_coherent_iommu_unmap_page, - - .map_sg = arm_coherent_iommu_map_sg, - .unmap_sg = arm_coherent_iommu_unmap_sg, - - .set_dma_mask = arm_dma_set_mask, - .dma_supported = arm_iommu_dma_supported, -}; - /** * arm_iommu_create_mapping * @bus: pointer to the bus holding the client device (for IOMMU calls) |