amdgpu vs kexec

[Peter Zijlstra]

On Tue, Jun 17, 2025 at 09:12:12PM -0500, Mario Limonciello wrote:

> How about if we reset before the kexec?  There is a symbol for drivers to
> use to know they're about to go through kexec to do $THINGS.
> 
> Something like this:
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 0fc0eeedc6461..2b1216b14d618 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -34,6 +34,7 @@
> 
>  #include <linux/cc_platform.h>
>  #include <linux/dynamic_debug.h>
> +#include <linux/kexec.h>
>  #include <linux/module.h>
>  #include <linux/mmu_notifier.h>
>  #include <linux/pm_runtime.h>
> @@ -2544,6 +2545,9 @@ amdgpu_pci_shutdown(struct pci_dev *pdev)
>                 adev->mp1_state = PP_MP1_STATE_UNLOAD;
>         amdgpu_device_ip_suspend(adev);
>         adev->mp1_state = PP_MP1_STATE_NONE;
> +
> +       if (kexec_in_progress)
> +               amdgpu_asic_reset(adev);
>  }
> 
>  static int amdgpu_pmops_prepare(struct device *dev)

I will throw this in the dev kernel... I'll let you know.