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drm/amdkfd: Define config HSA_AMD_P2P to support peer-to-peer

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Extend current kernel config requirements of amdgpu by adding config
HSA_AMD_P2P. Enabling HSA_AMD_P2P is REQUIRED to support peer-to-peer
communication between AMD GPU devices over PCIe bus

Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ramesh Errabolu 2022-05-26 11:51:08 -05:00 committed by Alex Deucher
parent c55300ad4a
commit 6fbfc3a23c
1 changed files with 14 additions and 0 deletions
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14
drivers/gpu/drm/amd/amdkfd/Kconfig
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@ -25,3 +25,17 @@ config HSA_AMD_SVM
preemptions and one based on page faults. To enable page fault
based memory management on most GFXv9 GPUs, set the module
parameter amdgpu.noretry=0.
config HSA_AMD_P2P
bool "HSA kernel driver support for peer-to-peer for AMD GPU devices"
depends on HSA_AMD && PCI_P2PDMA && DMABUF_MOVE_NOTIFY
help
Enable peer-to-peer (P2P) communication between AMD GPUs over
the PCIe bus. This can improve performance of multi-GPU compute
applications and libraries by enabling GPUs to access data directly
in peer GPUs' memory without intermediate copies in system memory.
This P2P feature is only enabled on compatible chipsets, and between
GPUs with large memory BARs that expose the entire VRAM in PCIe bus
address space within the physical address limits of the GPUs.