When bandwidth limits are looked up using pcie_bandwidth_available() virtual links such as USB4 are analyzed which might not represent the real speed. Furthermore devices may change speeds autonomously which may introduce conditional variation to the results reported in the status registers. Instead look at the capabilities of first PCI device outside of dGPU to decide upper limits that the dGPU will work at. For eGPU this effectively means that it will use the speed of the link partner. As the new semenatics of this are unique to AMD dGPUs, create a new local symbol instead of changing pcie_bandwidth_available(). Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2925#note_2145860 Link: https://www.usb.org/document-library/usb4r-specification-v20 USB4 V2 with Errata and ECN through June 2023 Section 11.2.1 Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 37 ++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 1fc73bb4ec73..683ea2284827 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -5721,6 +5721,39 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev, return r; } +/** + * amdgpu_device_partner_bandwidth - find the bandwidth of appropriate partner + * + * @adev: amdgpu_device pointer + * @speed: pointer to the speed of the link + * @width: pointer to the width of the link + * + * Evaluate the hierarchy to find the speed and bandwidth capabilities of the + * first physical partner to an AMD dGPU. + * This will exclude any virtual switches and links. + */ +static void amdgpu_device_partner_bandwidth(struct amdgpu_device *adev, + enum pci_bus_speed *speed, + enum pcie_link_width *width) +{ + struct pci_dev *parent = adev->pdev; + + if (!speed || !width) + return; + + *speed = PCI_SPEED_UNKNOWN; + *width = PCIE_LNK_WIDTH_UNKNOWN; + + while ((parent = pci_upstream_bridge(parent))) { + /* skip upstream/downstream switches internal to dGPU*/ + if (parent->vendor == PCI_VENDOR_ID_ATI) + continue; + *speed = pcie_get_speed_cap(parent); + *width = pcie_get_width_cap(parent); + break; + } +} + /** * amdgpu_device_get_pcie_info - fence pcie info about the PCIE slot * @@ -5754,8 +5787,8 @@ static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev) if (adev->pm.pcie_gen_mask && adev->pm.pcie_mlw_mask) return; - pcie_bandwidth_available(adev->pdev, NULL, - &platform_speed_cap, &platform_link_width); + amdgpu_device_partner_bandwidth(adev, &platform_speed_cap, + &platform_link_width); if (adev->pm.pcie_gen_mask == 0) { /* asic caps */ -- 2.34.1
