Re: [PATCH v1 0/6] Introduce Xe PCIe FLR

[Raag Jadav <raag.jadav@intel.com>]

On Thu, Feb 26, 2026 at 04:08:22PM +0000, Matthew Auld wrote:
> On 24/02/2026 10:25, Raag Jadav wrote:
> > Here's my humble attempt at introducing PCIe FLR support in xe driver.
> > This is ofcourse a half baked implementation and only limited to reloading
> > uC firmwares. This needs to be extended for a lot of different components
> > which I've skipped here for my lack of competence, so feel free to join
> > in and support them.
> 
> I couldn't find where we re-init all the migrate stuff? There is a bunch of
> PPGTT programming that will be lost if VRAM gets wiped. And then also the
> migrate queue/context itself. See xe_migrate_init().

Yes, Brost already pointed it out offline and I have it working locally thanks
to him. v2 will be coming up with xe_migrate_reinit() -> xe_lrc_reinit().

Raag

> > PS: This works enough to allow a single exec test run after FLR but it
> > follows with a GuC crash on subsequent runs which I'm still investigating.
> > 
> > Raag Jadav (6):
> >    drm/xe/uc_fw: Allow reloading firmware
> >    drm/xe/uc: Introduce FLR helpers
> >    drm/xe/irq: Introduce FLR helper
> >    drm/xe: Introduce xe_device_assert_lmem_ready()
> >    drm/xe/bo_evict: Introduce xe_bo_restore_map()
> >    drm/xe/pci: Introduce PCIe FLR
> > 
> >   drivers/gpu/drm/xe/Makefile      |   1 +
> >   drivers/gpu/drm/xe/xe_bo_evict.c |  34 +++++--
> >   drivers/gpu/drm/xe/xe_bo_evict.h |   2 +
> >   drivers/gpu/drm/xe/xe_device.c   |   4 +-
> >   drivers/gpu/drm/xe/xe_device.h   |   1 +
> >   drivers/gpu/drm/xe/xe_gsc.c      |  15 ++++
> >   drivers/gpu/drm/xe/xe_gsc.h      |   1 +
> >   drivers/gpu/drm/xe/xe_gt.c       |  10 +++
> >   drivers/gpu/drm/xe/xe_gt.h       |   2 +
> >   drivers/gpu/drm/xe/xe_guc.c      |  16 ++++
> >   drivers/gpu/drm/xe/xe_guc.h      |   1 +
> >   drivers/gpu/drm/xe/xe_huc.c      |  16 ++++
> >   drivers/gpu/drm/xe/xe_huc.h      |   1 +
> >   drivers/gpu/drm/xe/xe_irq.c      |   7 +-
> >   drivers/gpu/drm/xe/xe_irq.h      |   1 +
> >   drivers/gpu/drm/xe/xe_pci.c      |   1 +
> >   drivers/gpu/drm/xe/xe_pci.h      |   2 +
> >   drivers/gpu/drm/xe/xe_pci_err.c  | 147 +++++++++++++++++++++++++++++++
> >   drivers/gpu/drm/xe/xe_uc.c       |  24 +++++
> >   drivers/gpu/drm/xe/xe_uc.h       |   2 +
> >   drivers/gpu/drm/xe/xe_uc_fw.c    |  33 +++----
> >   drivers/gpu/drm/xe/xe_uc_fw.h    |   1 +
> >   22 files changed, 295 insertions(+), 27 deletions(-)
> >   create mode 100644 drivers/gpu/drm/xe/xe_pci_err.c
> > 
>