[PATCH] drm/amdgpu: make IB test synchronize with init for SRIOV(v2)

[Liu, Monk]

We'd better not let the flush after sysfs creation otherwise there is chance that user use sysfs to touch hardware before the IB test done and introduce headache issues 

_____________________________________
Monk Liu|GPU Virtualization Team |AMD


-----Original Message-----
From: Christian König <ckoenig.leichtzumerken at gmail.com> 
Sent: Monday, June 29, 2020 5:44 PM
To: Liu, Monk <Monk.Liu at amd.com>; amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu: make IB test synchronize with init for SRIOV(v2)

Am 29.06.20 um 11:35 schrieb Monk Liu:
> issue:
> originally we kickoff IB test asynchronously with driver's init, thus 
> the IB test may still running when the driver loading done (modprobe 
> amdgpu done).
> if we shutdown VM immediately after amdgpu driver loaded then GPU may 
> hang because the IB test is still running
>
> fix:
> flush the delayed_init routine at the bottom of device_init to avoid 
> driver loading done prior to the IB test completes
>
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>

Maybe do this even after sysfs and PMU init, but either way Acked-by: 
Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 457f5d2..7a4e965 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3295,6 +3295,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>   	queue_delayed_work(system_wq, &adev->delayed_init_work,
>   			   msecs_to_jiffies(AMDGPU_RESUME_MS));
>   
> +	if (amdgpu_sriov_vf(adev))
> +		flush_delayed_work(&adev->delayed_init_work);
> +
>   	r = sysfs_create_files(&adev->dev->kobj, amdgpu_dev_attributes);
>   	if (r) {
>   		dev_err(adev->dev, "Could not create amdgpu device attr\n");