On 2022-06-03 06:52, Ramesh Errabolu wrote:
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@xxxxxxx>
This patch is Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
--- drivers/gpu/drm/amd/amdkfd/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/Kconfig b/drivers/gpu/drm/amd/amdkfd/Kconfig index 8cc0a76ddf9f..93bd4eda0d94 100644 --- a/drivers/gpu/drm/amd/amdkfd/Kconfig +++ b/drivers/gpu/drm/amd/amdkfd/Kconfig @@ -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. +
