linux.git/drivers/gpu/drm/scheduler, branch v7.2

drm/sched: Mark fair policy as experimental

2026-08-11T16:34:13+00:00

Mark the fair policy as experimental until reported regressions are
addressed.

Signed-off-by: Tvrtko Ursulin 
Cc: Luke.Wildhardt@proton.me
Cc: Matthew Brost 
Cc: Danilo Krummrich 
Cc: Philipp Stanner 
Cc: Christian König 
Signed-off-by: Tvrtko Ursulin 
Link: https://lore.kernel.org/r/20260811163139.99746-20-tvrtko.ursulin@igalia.com

Revert "drm/sched: Switch default policy to fair"

2026-08-11T16:34:13+00:00

This reverts commit 45c211ddf92a1f9b4214ffadaf70d9037f53aaf6.

Signed-off-by: Tvrtko Ursulin 
Cc: Luke.Wildhardt@proton.me
Cc: Matthew Brost 
Cc: Danilo Krummrich 
Cc: Philipp Stanner 
Cc: Christian König 
Signed-off-by: Tvrtko Ursulin 
Link: https://lore.kernel.org/r/20260811163139.99746-19-tvrtko.ursulin@igalia.com

Revert "drm/sched: Remove FIFO and RR and simplify to a single run queue"

2026-08-11T16:34:10+00:00

This reverts commit 77a6809f1dc39376116f8d769a0d2630dc95ad79.

Signed-off-by: Tvrtko Ursulin 
Cc: Luke.Wildhardt@proton.me
Cc: Matthew Brost 
Cc: Danilo Krummrich 
Cc: Philipp Stanner 
Cc: Christian König 
Signed-off-by: Tvrtko Ursulin 
Link: https://lore.kernel.org/r/20260811163139.99746-18-tvrtko.ursulin@igalia.com

Revert "drm/sched: Embed run queue singleton into the scheduler"

2026-08-11T16:34:06+00:00

This reverts commit 16e7698bc04d3dd19d95a688e4b0297a0e28a93b.

Signed-off-by: Tvrtko Ursulin 
Cc: Luke.Wildhardt@proton.me
Cc: Matthew Brost 
Cc: Danilo Krummrich 
Cc: Philipp Stanner 
Cc: Christian König 
Signed-off-by: Tvrtko Ursulin 
Link: https://lore.kernel.org/r/20260811163139.99746-17-tvrtko.ursulin@igalia.com

Revert "drm/sched: Remove drm_sched_init_args->num_rqs usage"

2026-08-11T16:34:01+00:00

This reverts commit 2833a0512b4cd55d9fea7ec18be85ef82e69ad3b.

Signed-off-by: Tvrtko Ursulin 
Cc: Luke.Wildhardt@proton.me
Cc: Matthew Brost 
Cc: Danilo Krummrich 
Cc: Philipp Stanner 
Cc: Christian König 
Signed-off-by: Tvrtko Ursulin 
Link: https://lore.kernel.org/r/20260811163139.99746-5-tvrtko.ursulin@igalia.com

drm/sched: Fix clang build warning in kunit tests

2026-05-29T09:37:12+00:00

Initializing compile time constant struct or arrays from another such
variable is a gcc extension, while clang strictly requires a compile time
constant literal.

As reported by LKP:

>> drivers/gpu/drm/scheduler/tests/tests_scheduler.c:675:10: error: initializer element is not a compile-time constant
                                 drm_sched_scheduler_two_clients_attr),
                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/kunit/test.h:224:13: note: expanded from macro 'KUNIT_CASE_PARAM_ATTR'
                     .attr = attributes, .module_name = KBUILD_MODNAME}
                             ^~~~~~~~~~
   1 error generated.

vim +675 drivers/gpu/drm/scheduler/tests/tests_scheduler.c

   671
   672	static struct kunit_case drm_sched_scheduler_two_clients_tests[] = {
   673		KUNIT_CASE_PARAM_ATTR(drm_sched_scheduler_two_clients_test,
   674				      drm_sched_scheduler_two_clients_gen_params,
 > 675				      drm_sched_scheduler_two_clients_attr),
   676		{}
   677	};
   678

Fix it by using a compound literal as other tests do.

Signed-off-by: Tvrtko Ursulin 
Reported-by: kernel test robot 
Closes: https://lore.kernel.org/oe-kbuild-all/202605220312.Pu7UO05u-lkp@intel.com/
Fixes: 97ef806a5314 ("drm/sched: Add some scheduling quality unit tests")
Cc: Philipp Stanner 
Acked-by: Philipp Stanner 
Signed-off-by: Tvrtko Ursulin 
Link: https://lore.kernel.org/r/20260522090129.9385-1-tvrtko.ursulin@igalia.com

drm/sched: Remove drm_sched_init_args->num_rqs usage

2026-04-17T12:43:29+00:00

Remove member no longer used by the scheduler core.

Signed-off-by: Tvrtko Ursulin 
Cc: Matthew Brost 
Cc: Danilo Krummrich 
Cc: Philipp Stanner 
Cc: Christian König 
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Matthew Brost 
Signed-off-by: Philipp Stanner 
Link: https://patch.msgid.link/20260417103744.76020-27-tvrtko.ursulin@igalia.com

drm/sched: Embed run queue singleton into the scheduler

2026-04-17T12:43:29+00:00

Now that the run queue to scheduler relationship is always 1:1 we can
embed it (the run queue) directly in the scheduler struct and save on
some allocation error handling code and such.

Signed-off-by: Tvrtko Ursulin 
Cc: Christian König 
Cc: Danilo Krummrich 
Cc: Matthew Brost 
Cc: Philipp Stanner 
Acked-by: Danilo Krummrich 
Tested-by: Vitaly Prosyak 
Signed-off-by: Philipp Stanner 
Link: https://patch.msgid.link/20260417103744.76020-15-tvrtko.ursulin@igalia.com

drm/sched: Remove FIFO and RR and simplify to a single run queue

2026-04-17T12:43:29+00:00

Since the new FAIR policy is in general better than FIFO and almost as
good as round-robin in interactive use cases, plus the latter has not been
the default policy in a long time, we can afford to remove both and leave
just FAIR.

By doing so we can simplify the scheduler code by making the scheduler to
run queue relationship always 1:1 and remove some code.

Also, now that the FIFO policy is gone the tree of entities is not a FIFO
tree any more so rename it to just the tree.

Signed-off-by: Tvrtko Ursulin 
Cc: Christian König 
Cc: Danilo Krummrich 
Cc: Matthew Brost 
Cc: Philipp Stanner 
Acked-by: Danilo Krummrich 
Tested-by: Vitaly Prosyak 
Signed-off-by: Philipp Stanner 
Link: https://patch.msgid.link/20260417103744.76020-14-tvrtko.ursulin@igalia.com

drm/sched: Switch default policy to fair

2026-04-17T12:43:28+00:00

FAIR policy works better than FIFO for all known use cases and either
matches or gets close to RR. Lets make it a default to improve the user
experience especially with interactive workloads competing with heavy
clients.

Signed-off-by: Tvrtko Ursulin 
Cc: Christian König 
Cc: Danilo Krummrich 
Cc: Matthew Brost 
Cc: Philipp Stanner 
Cc: Pierre-Eric Pelloux-Prayer 
Acked-by: Danilo Krummrich 
Tested-by: Vitaly Prosyak 
Signed-off-by: Philipp Stanner 
Link: https://patch.msgid.link/20260417103744.76020-13-tvrtko.ursulin@igalia.com