[PATCH 0/5] Have xe_vm and xe_exec_queue take references to xef

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

xe_file_close triggers an asynchronous queue cleanup and then frees up
the xef object. Since queue cleanup flushes all pending jobs and the KMD
stores client usage stats into the xef object after jobs are flushed, we
see a use-after-free for the xef object. Resolve this by taking a
reference to xef from it's users - xe_exec_queue and xe_vm.

Issue: https://gitlab.freedesktop.org/drm/xe/kernel/issues/1908

@Maintainers
I need to use the below tags in the patches, but not sure which patches
to apply these on since all patches are part of the fix.

Fixes: 6109f24f87d7 ("drm/xe: Add helper to accumulate exec queue runtime")
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/1908

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>

Umesh Nerlige Ramappa (5):
  drm/xe: Move part of xe_file cleanup to a helper
  drm/xe: Add ref counting for xe_file
  drm/xe: Take a reference to xe file when user creates exec_queue
  drm/xe: Take a ref to xe file when user creates a VM
  Revert "drm/xe: Do not access xe file when updating exec queue
    run_ticks"

 drivers/gpu/drm/xe/xe_device.c           | 39 +++++++++++++++---------
 drivers/gpu/drm/xe/xe_device.h           | 12 ++++++++
 drivers/gpu/drm/xe/xe_device_types.h     |  3 ++
 drivers/gpu/drm/xe/xe_drm_client.c       |  5 +--
 drivers/gpu/drm/xe/xe_exec_queue.c       | 11 ++++++-
 drivers/gpu/drm/xe/xe_exec_queue_types.h |  7 ++---
 drivers/gpu/drm/xe/xe_vm.c               |  5 ++-
 7 files changed, 58 insertions(+), 24 deletions(-)

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2.38.1