drm/xe/guc: add uninterruptible suspend wait for cross-process cleanup

Browse source

Add a suspend_wait_blocking() exec queue op: an uninterruptible variant
of suspend_wait() for callers that must complete a suspend on behalf of a
queue that may belong to a different process than the calling task (e.g.
cleanup/undo paths). An interruptible suspend_wait() returns -ERESTARTSYS
when the calling task is signalled, which would leave the other process's
queue suspended forever - a cross-process DoS.

The blocking variant waits uninterruptibly and, on a genuine GuC timeout,
bans and tears down the queue like suspend_wait() (shared via
guc_exec_queue_suspend_timeout_ban()). It deliberately does not handle VF
recovery since a blocking caller cannot retry.

Assisted-by: Github-Copilot:Claude-opus-4.8
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260713202317.2187787-11-niranjana.vishwanathapura@intel.com

...

This commit is contained in:

Niranjana Vishwanathapura 2026-07-13 13:23:18 -07:00

parent dad2af2da9

commit 412c885692

3 changed files with 49 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

9

drivers/gpu/drm/xe/xe_exec_queue_types.h

View file

1

drivers/gpu/drm/xe/xe_execlist.c

View file

39

drivers/gpu/drm/xe/xe_guc_submit.c

View file