[PATCH v5 4/7] drm/amd: Capture errors in amdgpu_switcheroo_set_state()

[Christian König]

Am 06.10.23 um 20:50 schrieb Mario Limonciello:
> amdgpu_switcheroo_set_state() calls lots of functions that could
> fail under memory pressure or for other reasons.  Don't assume
> everything can successfully run sequentially, and check return codes
> for everything that returns one.
>
> Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>

Acked-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 36 +++++++++++++++++-----
>   1 file changed, 29 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index a362152cd0da..8dfcff783dab 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -1749,23 +1749,45 @@ static void amdgpu_switcheroo_set_state(struct pci_dev *pdev,
>   		/* don't suspend or resume card normally */
>   		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
>   
> -		pci_set_power_state(pdev, PCI_D0);
> -		amdgpu_device_load_pci_state(pdev);
> +		r = pci_set_power_state(pdev, PCI_D0);
> +		if (r) {
> +			DRM_WARN("pci_set_power_state failed (%d)\n", r);
> +			return;
> +		}
> +		if (!amdgpu_device_load_pci_state(pdev))
> +			return;
>   		r = pci_enable_device(pdev);
>   		if (r)
>   			DRM_WARN("pci_enable_device failed (%d)\n", r);
> -		amdgpu_device_resume(dev, true);
> +		r = amdgpu_device_resume(dev, true);
> +		if (r) {
> +			DRM_WARN("amdgpu_device_resume failed (%d)\n", r);
> +			return;
> +		}
>   
>   		dev->switch_power_state = DRM_SWITCH_POWER_ON;
>   	} else {
>   		pr_info("switched off\n");
>   		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
> -		amdgpu_device_prepare(dev);
> -		amdgpu_device_suspend(dev, true);
> -		amdgpu_device_cache_pci_state(pdev);
> +		r = amdgpu_device_prepare(dev);
> +		if (r) {
> +			DRM_WARN("amdgpu_device_prepare failed (%d)\n", r);
> +			return;
> +		}
> +		r = amdgpu_device_suspend(dev, true);
> +		if (r) {
> +			DRM_WARN("amdgpu_device_suspend failed (%d)\n", r);
> +			return;
> +		}
> +		if (!amdgpu_device_cache_pci_state(pdev))
> +			return;
>   		/* Shut down the device */
>   		pci_disable_device(pdev);
> -		pci_set_power_state(pdev, PCI_D3cold);
> +		r = pci_set_power_state(pdev, PCI_D3cold);
> +		if (r) {
> +			DRM_WARN("pci_set_power_state failed (%d)\n", r);
> +			return;
> +		}
>   		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
>   	}
>   }