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drm/amdgpu: Inform if PCIe based P2P links are not available

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Raise an info message in kernel log if PCIe root complex
determines that a AMD GPU device D<i> cannot have P2P
communication with another AMD GPU device D<j>

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 2024-11-05 18:50:02 -06:00 committed by Alex Deucher
parent 69e9a9e65b
commit 8e29057eec
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -6200,6 +6200,9 @@ bool amdgpu_device_is_peer_accessible(struct amdgpu_device *adev,
bool p2p_access =
!adev->gmc.xgmi.connected_to_cpu &&
!(pci_p2pdma_distance(adev->pdev, peer_adev->dev, false) < 0);
if (!p2p_access)
dev_info(adev->dev, "PCIe P2P access from peer device %s is not supported by the chipset\n",
pci_name(peer_adev->pdev));
bool is_large_bar = adev->gmc.visible_vram_size &&
adev->gmc.real_vram_size == adev->gmc.visible_vram_size;