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: Mario Limonciello <mario.limonciello@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
