Commit 6fbfc3a2 authored by Ramesh Errabolu's avatar Ramesh Errabolu Committed by Alex Deucher
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drm/amdkfd: Define config HSA_AMD_P2P to support peer-to-peer 



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: default avatarRamesh Errabolu <Ramesh.Errabolu@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent c55300ad

drivers/gpu/drm/amd/amdkfd/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -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.