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

[Matthew Auld <matthew.auld@intel.com>]

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().

> 
> 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
>