[PATCH v2] drm/amdgpu: Inform if PCIe based P2P links are not available

[Ramesh Errabolu]

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.errab...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 230c24638a34..ab304a2c4aaf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -6222,6 +6222,8 @@ 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)
+               pr_info("PCIe based P2P links are not available\n");
 
        bool is_large_bar = adev->gmc.visible_vram_size &&
                adev->gmc.real_vram_size == adev->gmc.visible_vram_size;
-- 
2.34.1