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dma-mapping: prepare dma_map_ops to conversion to physical address

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Add new .map_phys() and .unmap_phys() callbacks to dma_map_ops as a
preparation to replace .map_page() and .unmap_page() respectively.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20251015-remove-map-page-v5-1-3bbfe3a25cdf@kernel.org
This commit is contained in:
Leon Romanovsky
2025-10-15 12:12:47 +03:00
committed by Marek Szyprowski
parent f74ee32963
commit ed7fc3cbb3
3 changed files with 21 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/dma-map-ops.h
View File

@@ -37,6 +37,13 @@ struct dma_map_ops {
void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir,
unsigned long attrs);
dma_addr_t (*map_phys)(struct device *dev, phys_addr_t phys,
size_t size, enum dma_data_direction dir,
unsigned long attrs);
void (*unmap_phys)(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir,
unsigned long attrs);
/*
* map_sg should return a negative error code on error. See
* dma_map_sgtable() for a list of appropriate error codes

4
kernel/dma/mapping.c
View File

@@ -169,6 +169,8 @@ dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, size_t size,
addr = dma_direct_map_phys(dev, phys, size, dir, attrs);
else if (use_dma_iommu(dev))
addr = iommu_dma_map_phys(dev, phys, size, dir, attrs);
else if (ops->map_phys)
addr = ops->map_phys(dev, phys, size, dir, attrs);
else if (is_mmio) {
if (!ops->map_resource)
return DMA_MAPPING_ERROR;
@@ -223,6 +225,8 @@ void dma_unmap_phys(struct device *dev, dma_addr_t addr, size_t size,
dma_direct_unmap_phys(dev, addr, size, dir, attrs);
else if (use_dma_iommu(dev))
iommu_dma_unmap_phys(dev, addr, size, dir, attrs);
else if (ops->unmap_phys)
ops->unmap_phys(dev, addr, size, dir, attrs);
else if (is_mmio) {
if (ops->unmap_resource)
ops->unmap_resource(dev, addr, size, dir, attrs);

12
kernel/dma/ops_helpers.c
View File

@@ -64,6 +64,7 @@ struct page *dma_common_alloc_pages(struct device *dev, size_t size,
{
const struct dma_map_ops *ops = get_dma_ops(dev);
struct page *page;
phys_addr_t phys;
page = dma_alloc_contiguous(dev, size, gfp);
if (!page)
@@ -71,9 +72,13 @@ struct page *dma_common_alloc_pages(struct device *dev, size_t size,
if (!page)
return NULL;
phys = page_to_phys(page);
if (use_dma_iommu(dev))
*dma_handle = iommu_dma_map_phys(dev, page_to_phys(page), size,
dir, DMA_ATTR_SKIP_CPU_SYNC);
*dma_handle = iommu_dma_map_phys(dev, phys, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
else if (ops->map_phys)
*dma_handle = ops->map_phys(dev, phys, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
else
*dma_handle = ops->map_page(dev, page, 0, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
@@ -94,6 +99,9 @@ void dma_common_free_pages(struct device *dev, size_t size, struct page *page,
if (use_dma_iommu(dev))
iommu_dma_unmap_phys(dev, dma_handle, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
else if (ops->unmap_phys)
ops->unmap_phys(dev, dma_handle, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
else if (ops->unmap_page)
ops->unmap_page(dev, dma_handle, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);