From: Sui Jingfeng <suijingfeng@xxxxxxxxxxx> [why] The vga_is_firmware_default() function defined in drivers/pci/vgaarb.c is arch-dependent, it's a dummy on non-x86 architectures. This made VGAARB lost an important condition for the arbitration on non-x86 platform. The rules about which GPU is (or should be) the primary display device get used by userspace are obscure on non-x86 platform, let's made the things clear. [how] The device that owns the firmware framebuffer should be the default boot device. This patch adds an arch-independent function to implement this rule. The vgaarb subsystem will call back to amdgpu_is_primary_gpu() when drm/amdgpu is bound to an AMDGPU device successfully. Cc: Alex Deucher <alexander.deucher@xxxxxxx> Cc: Christian Konig <christian.koenig@xxxxxxx> Cc: Pan Xinhui <Xinhui.Pan@xxxxxxx> Cc: David Airlie <airlied@xxxxxxxxx> Cc: Daniel Vetter <daniel@xxxxxxxx> Cc: Hawking Zhang <Hawking.Zhang@xxxxxxx> Cc: Mario Limonciello <mario.limonciello@xxxxxxx> Cc: Lijo Lazar <lijo.lazar@xxxxxxx> Cc: YiPeng Chai <YiPeng.Chai@xxxxxxx> Cc: Bokun Zhang <Bokun.Zhang@xxxxxxx> CC: Likun Gao <Likun.Gao@xxxxxxx> Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index d98f0801ac77..b638eff58636 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -3690,6 +3690,15 @@ static void amdgpu_device_set_mcbp(struct amdgpu_device *adev) DRM_INFO("MCBP is enabled\n"); } +static bool amdgpu_is_primary_gpu(struct pci_dev *pdev) +{ + struct drm_device *dev = pci_get_drvdata(pdev); + struct amdgpu_device *adev = drm_to_adev(dev); + struct amdgpu_gmc *gmc = &adev->gmc; + + return drm_aperture_contain_firmware_fb(gmc->aper_base, gmc->aper_size); +} + /** * amdgpu_device_init - initialize the driver * @@ -4103,7 +4112,8 @@ int amdgpu_device_init(struct amdgpu_device *adev, /* this will fail for cards that aren't VGA class devices, just * ignore it */ if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) - vga_client_register(adev->pdev, amdgpu_device_vga_set_decode, NULL); + vga_client_register(adev->pdev, amdgpu_device_vga_set_decode, + amdgpu_is_primary_gpu); px = amdgpu_device_supports_px(ddev); -- 2.25.1