[PATCH v5 12/14] x86: Use physical address for DMA mapping
From: Leon Romanovsky <leon@kernel.org>
Date: 2025-10-15 09:13:47
Also in:
linux-alpha, linux-arm-kernel, linux-iommu, linux-mips, lkml, sparclinux, xen-devel
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Leon Romanovsky <leonro@nvidia.com> Perform mechanical conversion from DMA .map_page to .map_phys. Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> --- arch/x86/kernel/amd_gart_64.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index 3485d419c2f5..93a06307d953 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c@@ -222,13 +222,14 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem, } /* Map a single area into the IOMMU */ -static dma_addr_t gart_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, +static dma_addr_t gart_map_phys(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir, unsigned long attrs) { unsigned long bus; - phys_addr_t paddr = page_to_phys(page) + offset; + + if (unlikely(attrs & DMA_ATTR_MMIO)) + return DMA_MAPPING_ERROR; if (!need_iommu(dev, paddr, size)) return paddr;
@@ -242,7 +243,7 @@ static dma_addr_t gart_map_page(struct device *dev, struct page *page, /* * Free a DMA mapping. */ -static void gart_unmap_page(struct device *dev, dma_addr_t dma_addr, +static void gart_unmap_phys(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction dir, unsigned long attrs) {
@@ -282,7 +283,7 @@ static void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, for_each_sg(sg, s, nents, i) { if (!s->dma_length || !s->length) break; - gart_unmap_page(dev, s->dma_address, s->dma_length, dir, 0); + gart_unmap_phys(dev, s->dma_address, s->dma_length, dir, 0); } }
@@ -487,7 +488,7 @@ static void gart_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_addr, unsigned long attrs) { - gart_unmap_page(dev, dma_addr, size, DMA_BIDIRECTIONAL, 0); + gart_unmap_phys(dev, dma_addr, size, DMA_BIDIRECTIONAL, 0); dma_direct_free(dev, size, vaddr, dma_addr, attrs); }
@@ -668,8 +669,8 @@ static __init int init_amd_gatt(struct agp_kern_info *info) static const struct dma_map_ops gart_dma_ops = { .map_sg = gart_map_sg, .unmap_sg = gart_unmap_sg, - .map_page = gart_map_page, - .unmap_page = gart_unmap_page, + .map_phys = gart_map_phys, + .unmap_phys = gart_unmap_phys, .alloc = gart_alloc_coherent, .free = gart_free_coherent, .mmap = dma_common_mmap,
--
2.51.0