Driver unload works fine (barring any bugs) as long as you are not using the device. E.g., unbound the fbcon and no apps are using the GPU.
Alex ________________________________ From: amd-gfx <[email protected]> on behalf of Koenig, Christian <[email protected]> Sent: Wednesday, September 18, 2019 3:53 AM To: Zhang, Jack (Jian) <[email protected]> Cc: Deng, Emily <[email protected]>; Cui, Flora <[email protected]>; Teng, Rui <[email protected]>; [email protected] <[email protected]> Subject: RE: [PATCH] drm/amdgpu/sriov: omit fbcon error under sriov or passthrough Hi Jack, Well that believe is unfortunately completely wrong. The point is that ANY use of amdgpu by userspace will prevent correct driver unload, that qxl is used for the fbcon doesn't change anything here. So the patch is a clear NAK. Driver unload is not supposed to work even under SRIOV. Regards, Christian. Am 18.09.2019 09:32 schrieb "Zhang, Jack (Jian)" <[email protected]>: Hi, Christian and folks, In virtual machines(such virt-manager), there's always a virtual graphics device existed like "qxl" as the default gfx device. So under such condition, we believe it's reasonable to unload amdgpu driver as it is not treated as the default fbcon device. Would you please help to review this patch? Best wishes, Jack -----Original Message----- From: Jack Zhang <[email protected]> Sent: Wednesday, September 18, 2019 3:25 PM To: [email protected] Cc: Zhang, Jack (Jian) <[email protected]> Subject: [PATCH] drm/amdgpu/sriov: omit fbcon error under sriov or passthrough In virtual machine, there would be a qxl or cirrus graphics device as the default master fbcon device. So for PF(passthrough mode) or SRIOV VF, it is reasonable to unload amdgpu driver. Amdgpu doesn't have to be the only fbcon device under this condition. Signed-off-by: Jack Zhang <[email protected]> --- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index 420888e..ada2b25 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -1103,8 +1103,9 @@ static void amdgpu_pci_remove(struct pci_dev *pdev) { struct drm_device *dev = pci_get_drvdata(pdev); - - DRM_ERROR("Device removal is currently not supported outside of fbcon\n"); + struct amdgpu_device *adev = dev->dev_private; + if (!amdgpu_sriov_vf(adev) && !amdgpu_passthrough(adev)) + DRM_ERROR("Device removal is currently not supported outside of +fbcon\n"); drm_dev_unplug(dev); drm_dev_put(dev); pci_disable_device(pdev); -- 2.7.4
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