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| author | Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org> | 2026-07-17 23:34:27 +0530 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2026-07-31 08:40:58 +0200 |
| commit | a6e40900f0c68884c76b7a3ca404d7d52b1791d3 (patch) | |
| tree | 51b89faa3ae302c58d56de89dafdb38b9cae89e9 /include/trace | |
| parent | d4b9d593180c72cafa2f586379b99517f251e6bb (diff) | |
| download | linux-a6e40900f0c68884c76b7a3ca404d7d52b1791d3.tar.gz linux-a6e40900f0c68884c76b7a3ca404d7d52b1791d3.zip | |
dma-mapping: Add internal shared allocation attribute
DMA_ATTR_CC_SHARED describes an existing DMA mapping whose backing memory
is already shared, or decrypted, for confidential computing. It is a
mapping attribute: callers use it to request a shared DMA address encoding
for memory that has already been prepared for shared DMA.
Allocation paths need a related but different state. Once the DMA core
decides that an allocation must use shared backing pages, the lower-level
allocation helpers need to select shared pools, decrypt newly allocated
pages, derive the DMA address with the shared-memory translation and
restore encryption on free. That state is internal to the DMA-mapping
implementation and should not be passed by drivers to dma_alloc_attrs().
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20260717180442.110954-10-aneesh.kumar@kernel.org
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/events/dma.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/trace/events/dma.h b/include/trace/events/dma.h index 31c9ddf72c9d..9df02c1511de 100644 --- a/include/trace/events/dma.h +++ b/include/trace/events/dma.h @@ -35,7 +35,8 @@ TRACE_DEFINE_ENUM(DMA_NONE); { DMA_ATTR_MMIO, "MMIO" }, \ { DMA_ATTR_DEBUGGING_IGNORE_CACHELINES, "CACHELINES_OVERLAP" }, \ { DMA_ATTR_REQUIRE_COHERENT, "REQUIRE_COHERENT" }, \ - { DMA_ATTR_CC_SHARED, "CC_SHARED" }) + { DMA_ATTR_CC_SHARED, "CC_SHARED" }, \ + { __DMA_ATTR_ALLOC_CC_SHARED, "ALLOC_CC_SHARED" }) DECLARE_EVENT_CLASS(dma_map, TP_PROTO(struct device *dev, phys_addr_t phys_addr, dma_addr_t dma_addr, |