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dma-mapping: remove unused map_page callback 

After conversion of arch code to use physical address mapping,
there are no users of .map_page() and .unmap_page() callbacks,
so let's remove them.

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-v5-14-3bbfe3a25cdf@kernel.org
pull/1354/merge
Leon Romanovsky 2025-10-15 12:13:00 +03:00 committed by Marek Szyprowski
parent 936a9f0cb1
commit 131971f67e
3 changed files with 1 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -31,13 +31,6 @@ struct dma_map_ops {
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
dma_addr_t (*map_page)(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir, unsigned long attrs);
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);

12
kernel/dma/mapping.c
View File

@ -171,16 +171,6 @@ dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, size_t size,
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 && ops->map_page) {
struct page *page = phys_to_page(phys);
size_t offset = offset_in_page(phys);
/*
* The dma_ops API contract for ops->map_page() requires
* kmappable memory.
*/
addr = ops->map_page(dev, page, offset, size, dir, attrs);
}
if (!is_mmio)
kmsan_handle_dma(phys, size, dir);
@ -222,8 +212,6 @@ void dma_unmap_phys(struct device *dev, dma_addr_t addr, size_t size,
iommu_dma_unmap_phys(dev, addr, size, dir, attrs);
else if (ops->unmap_phys)
ops->unmap_phys(dev, addr, size, dir, attrs);
else
ops->unmap_page(dev, addr, size, dir, attrs);
trace_dma_unmap_phys(dev, addr, size, dir, attrs);
debug_dma_unmap_phys(dev, addr, size, dir);
}

8
kernel/dma/ops_helpers.c
View File

@ -76,11 +76,8 @@ struct page *dma_common_alloc_pages(struct device *dev, size_t size,
if (use_dma_iommu(dev))
*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_handle = ops->map_phys(dev, phys, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
if (*dma_handle == DMA_MAPPING_ERROR) {
dma_free_contiguous(dev, page, size);
@ -102,8 +99,5 @@ void dma_common_free_pages(struct device *dev, size_t size, struct page *page,
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);
dma_free_contiguous(dev, page, size);
}