drm/amdgpu: Fix GPU PCIe link capability reporting

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Commit eb53125a7a ("drm/amd: Add dedicated helper for
amdgpu_device_find_parent()") made amdgpu_device_gpu_bandwidth() query
the first device outside the dGPU. That is the host side of the
physical link, not the GPU side.

As a result, the ASIC and platform capability masks can both be based
on the host port. drm_amdgpu_info_device then exposes the host
capabilities to userspace, such as Gen5 x16 for a Gen4 x8 GPU.

Cache both ends of the physical link during device initialization.
Use link_dev for the GPU capability and link_partner for the platform
capability and _PR3 detection.

Reported-by: "Marek Olšák" <maraeo@gmail.com>
Closes: https://lore.kernel.org/amd-gfx/CAAxE2A4VhsAzzO1QjBjUg+NgnbD04ZzMyN6xsUJxjKJHH6hxiw@mail.gmail.com/
Suggested-by: Lijo Lazar <lijo.lazar@amd.com>
Fixes: eb53125a7a ("drm/amd: Add dedicated helper for amdgpu_device_find_parent()")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 7ea6a47224)
Cc: stable@vger.kernel.org

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This commit is contained in:

Mario Limonciello 2026-09-15 10:59:45 -05:00 • committed by Alex Deucher

parent 723d4dc628

commit 04de4007d3

2 changed files with 20 additions and 31 deletions

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3

drivers/gpu/drm/amd/amdgpu/amdgpu.h

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48

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

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