On Wed, Jun 18, 2025 at 10:51:23AM +0200, Peter Zijlstra wrote: > 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.
First hurdle appears to be that this symbol is not exported. I fixed that, but perhaps the kexec folks don't like drivers to use this?
