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

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Message-ID: <b9bb9865-8bf4-4d9a-9bfd-945d38a7698a@amd.com>
Date: Thu, 10 Jul 2025 08:13:32 -0400
From: Mario Limonciello <mario.limonciello@....com>
To: Samuel Zhang <guoqing.zhang@....com>, alexander.deucher@....com,
 christian.koenig@....com, rafael@...nel.org, len.brown@...el.com,
 pavel@...nel.org, gregkh@...uxfoundation.org, dakr@...nel.org,
 airlied@...il.com, simona@...ll.ch, ray.huang@....com,
 matthew.auld@...el.com, matthew.brost@...el.com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de
Cc: lijo.lazar@....com, victor.zhao@....com, haijun.chang@....com,
 Qing.Ma@....com, Owen.Zhang2@....com, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v6 5/5] drm/amdgpu: do not resume device in thaw for
 normal hibernation

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@....com>
> Tested-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>

> ---
>   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);
>   }