From f7326196a781622b33bfbdabb00f5e72b5fb5679 Mon Sep 17 00:00:00 2001 From: Leon Romanovsky Date: Tue, 9 Sep 2025 16:27:39 +0300 Subject: dma-mapping: export new dma_*map_phys() interface Introduce new DMA mapping functions dma_map_phys() and dma_unmap_phys() that operate directly on physical addresses instead of page+offset parameters. This provides a more efficient interface for drivers that already have physical addresses available. The new functions are implemented as the primary mapping layer, with the existing dma_map_page_attrs()/dma_map_resource() and dma_unmap_page_attrs()/dma_unmap_resource() functions converted to simple wrappers around the phys-based implementations. In case dma_map_page_attrs(), the struct page is converted to physical address with help of page_to_phys() function and dma_map_resource() provides physical address as is together with addition of DMA_ATTR_MMIO attribute. The old page-based API is preserved in mapping.c to ensure that existing code won't be affected by changing EXPORT_SYMBOL to EXPORT_SYMBOL_GPL variant for dma_*map_phys(). Reviewed-by: Jason Gunthorpe Reviewed-by: Keith Busch Signed-off-by: Leon Romanovsky Signed-off-by: Marek Szyprowski Link: https://lore.kernel.org/r/54cc52af91777906bbe4a386113437ba0bcfba9c.1757423202.git.leonro@nvidia.com --- include/trace/events/dma.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/trace') diff --git a/include/trace/events/dma.h b/include/trace/events/dma.h index 84416c7d6bfa..5da59fd8121d 100644 --- a/include/trace/events/dma.h +++ b/include/trace/events/dma.h @@ -73,7 +73,6 @@ DEFINE_EVENT(dma_map, name, \ TP_ARGS(dev, phys_addr, dma_addr, size, dir, attrs)) DEFINE_MAP_EVENT(dma_map_phys); -DEFINE_MAP_EVENT(dma_map_resource); DECLARE_EVENT_CLASS(dma_unmap, TP_PROTO(struct device *dev, dma_addr_t addr, size_t size, @@ -111,7 +110,6 @@ DEFINE_EVENT(dma_unmap, name, \ TP_ARGS(dev, addr, size, dir, attrs)) DEFINE_UNMAP_EVENT(dma_unmap_phys); -DEFINE_UNMAP_EVENT(dma_unmap_resource); DECLARE_EVENT_CLASS(dma_alloc_class, TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr, -- cgit v1.2.3