Re: [PATCH v6 5/5] drm/amdgpu: do not resume device in thaw for normal hibernation

["Christian König" <christian.koenig@amd.com>]

On 10.07.25 14:13, Mario Limonciello wrote:
> On 7/10/2025 2:23 AM, Samuel Zhang wrote:
>> For normal hibernation, GPU do not need to be resumed in thaw since it is
>> not involved in writing the hibernation image. Skip resume in this case
>> can reduce the hibernation time.
>>
>> On VM with 8 * 192GB VRAM dGPUs, 98% VRAM usage and 1.7TB system memory,
>> this can save 50 minutes.
>>
>> Signed-off-by: Samuel Zhang <guoqing.zhang@amd.com>
>> Tested-by: Mario Limonciello <mario.limonciello@amd.com>
> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>

I think we now have reviews and acks for all patches, don't we?

What was the conclusion on how this should go upstream? Through drm-misc-next?

I've seen that you asked Mario, but I think I missed the response.

Regards,
Christian.

> 
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 17 +++++++++++++++++
>>   1 file changed, 17 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> index 1c54b2e5a225..021defca9b61 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> @@ -2541,6 +2541,10 @@ amdgpu_pci_shutdown(struct pci_dev *pdev)
>>       if (amdgpu_ras_intr_triggered())
>>           return;
>>   +    /* device maybe not resumed here, return immediately in this case */
>> +    if (adev->in_s4 && adev->in_suspend)
>> +        return;
>> +
>>       /* if we are running in a VM, make sure the device
>>        * torn down properly on reboot/shutdown.
>>        * unfortunately we can't detect certain
>> @@ -2557,6 +2561,10 @@ static int amdgpu_pmops_prepare(struct device *dev)
>>       struct drm_device *drm_dev = dev_get_drvdata(dev);
>>       struct amdgpu_device *adev = drm_to_adev(drm_dev);
>>   +    /* device maybe not resumed here, return immediately in this case */
>> +    if (adev->in_s4 && adev->in_suspend)
>> +        return 0;
>> +
>>       /* Return a positive number here so
>>        * DPM_FLAG_SMART_SUSPEND works properly
>>        */
>> @@ -2655,12 +2663,21 @@ static int amdgpu_pmops_thaw(struct device *dev)
>>   {
>>       struct drm_device *drm_dev = dev_get_drvdata(dev);
>>   +    /* do not resume device if it's normal hibernation */
>> +    if (!pm_hibernate_is_recovering())
>> +        return 0;
>> +
>>       return amdgpu_device_resume(drm_dev, true);
>>   }
>>     static int amdgpu_pmops_poweroff(struct device *dev)
>>   {
>>       struct drm_device *drm_dev = dev_get_drvdata(dev);
>> +    struct amdgpu_device *adev = drm_to_adev(drm_dev);
>> +
>> +    /* device maybe not resumed here, return immediately in this case */
>> +    if (adev->in_s4 && adev->in_suspend)
>> +        return 0;
>>         return amdgpu_device_suspend(drm_dev, true);
>>   }
>