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dma-mapping: Introduce DMA require coherency attribute

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The mapping buffers which carry this attribute require DMA coherent system.
This means that they can't take SWIOTLB path, can perform CPU cache overlap
and doesn't perform cache flushing.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260316-dma-debug-overlap-v3-4-1dde90a7f08b@nvidia.com
This commit is contained in:
Leon Romanovsky
2026-03-16 21:06:48 +02:00
committed by Marek Szyprowski
parent 9bb0a4d6a4
commit e6a58fa255
5 changed files with 33 additions and 2 deletions
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3
include/trace/events/dma.h
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@@ -33,7 +33,8 @@ TRACE_DEFINE_ENUM(DMA_NONE);
{ DMA_ATTR_NO_WARN, "NO_WARN" }, \
{ DMA_ATTR_PRIVILEGED, "PRIVILEGED" }, \
{ DMA_ATTR_MMIO, "MMIO" }, \
{ DMA_ATTR_DEBUGGING_IGNORE_CACHELINES, "CACHELINES_OVERLAP" })
{ DMA_ATTR_DEBUGGING_IGNORE_CACHELINES, "CACHELINES_OVERLAP" }, \
{ DMA_ATTR_REQUIRE_COHERENT, "REQUIRE_COHERENT" })
DECLARE_EVENT_CLASS(dma_map,
TP_PROTO(struct device *dev, phys_addr_t phys_addr, dma_addr_t dma_addr,