kernel/linux.git/drivers/gpu/drm/panthor, branch v6.12.101

drm/panthor: return error on truncated firmware

2026-08-03T09:17:18+00:00

commit 4a2c8cbe9bcba170706fdf08b1c84b6cbcf5b044 upstream. panthor_fw_load() detects truncated firmware images, but jumps to the common cleanup path without setting ret. If no previous error was recorded, the function can return 0 and treat the invalid firmware as successfully loaded. Set ret to -EINVAL before leaving the truncated-image path. Fixes: 2718d91816ee ("drm/panthor: Add the FW logical block") Cc: stable@vger.kernel.org Signed-off-by: Osama Abdelkader Reviewed-by: Liviu Dudau Reviewed-by: Boris Brezillon Link: https://patch.msgid.link/20260714163056.22329-1-osama.abdelkader@gmail.com Signed-off-by: Liviu Dudau Signed-off-by: Greg Kroah-Hartman

drm/panthor: Interrupt group start/resumption if group_bind_locked() fails

2026-07-24T14:11:19+00:00

[ Upstream commit 1f27cef1f41dac0bd254d8741766f189936c9880 ] group_bind_locked() can fail if the MMU block is stuck. This is normally a reset situation, but by the time we reset the GPU, we might have tried to resume a group that's not resident, which will probably trip out the FW. So let's avoid that by bailing out when group_bind_locked() returns an error. We don't even try to start more groups because the GPU will be reset anyway. Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reported-by: sashiko-bot@kernel.org Closes: https://sashiko.dev/#/patchset/20260623-panthor-signal-from-irq-v3-0-2ece396f8ee0@collabora.com?part=7 Signed-off-by: Boris Brezillon Reviewed-by: Liviu Dudau Signed-off-by: Liviu Dudau Link: https://patch.msgid.link/20260625-panthor-misc-fixes-v1-10-b67ed973fea6@collabora.com Signed-off-by: Sasha Levin

drm/panthor: Fix a leak when a group is evicted before the tiler OOM is serviced

2026-07-24T14:11:19+00:00

[ Upstream commit 6efeb9ddb4fbf5ac30aff03e8f09ffbdf966abd0 ] A group ref is tied to the pending tiler_oom_work, so we need to release it if the cancel was effective. Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reported-by: sashiko-bot@kernel.org Closes: https://sashiko.dev/#/patchset/20260623-panthor-signal-from-irq-v3-0-2ece396f8ee0@collabora.com?part=7 Signed-off-by: Boris Brezillon Reviewed-by: Liviu Dudau Signed-off-by: Liviu Dudau Link: https://patch.msgid.link/20260625-panthor-misc-fixes-v1-9-b67ed973fea6@collabora.com Signed-off-by: Sasha Levin

drm/panthor: Don't overrule pending immediate ticks in sched_resume_tick()

2026-07-24T14:11:19+00:00

[ Upstream commit 6fec8b473497b7f32e604a6dd92b32b0889af3e8 ] We schedule immediate ticks when we need to process events on CSGs, but those immediate ticks don't change the resched_target because we want the other groups to stay scheduled for the remaining of the GPU timeslot they were given. Make sure these immediate ticks don't get overruled by a sched_queue_delayed_work() that would delay the tick execution. Fixes: 99820b4b7e50 ("drm/panthor: Make sure we resume the tick when new jobs are submitted") Reported-by: sashiko-bot@kernel.org Closes: https://sashiko.dev/#/patchset/20260625-panthor-signal-from-irq-v4-0-3d2908912afa@collabora.com?part=9 Signed-off-by: Boris Brezillon Reviewed-by: Karunika Choo Signed-off-by: Liviu Dudau Link: https://patch.msgid.link/20260625-panthor-misc-fixes-v1-6-b67ed973fea6@collabora.com Signed-off-by: Sasha Levin

drm/panthor: Fix potential invalid pointer deref in group_process_tiler_oom()

2026-07-24T14:11:19+00:00

[ Upstream commit b39436d0ba1571dbcda69d20ec567344b3eecfc7 ] If heaps is an ERR_PTR(), panthor_heap_pool_put() will deref an invalid pointer. Make sure we set it to NULL in that case. Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reported-by: sashiko-bot@kernel.org Closes: https://sashiko.dev/#/patchset/20260625-panthor-signal-from-irq-v5-0-8836a74e0ef9@collabora.com?part=2 Signed-off-by: Boris Brezillon Reviewed-by: Liviu Dudau Signed-off-by: Liviu Dudau Link: https://patch.msgid.link/20260625-panthor-misc-fixes-v1-4-b67ed973fea6@collabora.com Signed-off-by: Sasha Levin

drm/panthor: Evict groups before VM termination

2026-03-04T12:19:50+00:00

[ Upstream commit 565ed40b5fc1242f7538a016fce5a85f802d4fb5 ] Ensure all related groups are evicted and suspended before VM destruction takes place. This fixes an issue where panthor_vm_destroy() destroys and unmaps the heap context while there are still on slot groups using this. The FW will do a write out to the heap context when a CSG (group) is suspended, so a premature unmap of the heap context will cause a GPU page fault. This page fault is quite harmless, and do not affect the continued operation of the GPU. Fixes: 647810ec2476 ("drm/panthor: Add the MMU/VM logical block") Reviewed-by: Boris Brezillon Signed-off-by: Ketil Johnsen Reviewed-by: Liviu Dudau Reviewed-by: Steven Price Link: https://patch.msgid.link/20251219093546.1227697-1-ketil.johnsen@arm.com Co-developed-by: Boris Brezillon Signed-off-by: Boris Brezillon Signed-off-by: Sasha Levin

drm/panthor: Make sure we resume the tick when new jobs are submitted

2026-03-04T12:19:49+00:00

[ Upstream commit 99820b4b7e50d9651f01d2d55b6b9ba92dcc5b99 ] If the group is already assigned a slot but was idle before this job submission, we need to make sure the priority rotation happens in the future. Extract the existing logic living in group_schedule_locked() and call this new sched_resume_tick() helper from the "group is assigned a slot" path. v2: - Add R-b v3: - Re-use queue_mask to clear the bit - Collect R-b Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reviewed-by: Steven Price Reviewed-by: Chia-I Wu Link: https://patch.msgid.link/20251128094839.3856402-8-boris.brezillon@collabora.com Signed-off-by: Boris Brezillon Signed-off-by: Sasha Levin

drm/panthor: Fix the logic that decides when to stop ticking

2026-03-04T12:19:48+00:00

[ Upstream commit 61d9a43d70dc3e1709ecd14a34f6d5f01e21dfc9 ] When we have multiple active groups with the same priority, we need to keep ticking for the priority rotation to take place. If we don't do that, we might starve slots with lower priorities. It's annoying to deal with that in tick_ctx_update_resched_target(), so let's add a ::stop_tick field to the tick context which is initialized to true, and downgraded to false as soon as we detect something that requires to tick to happen. This way we can complement the current logic with extra conditions if needed. v2: - Add R-b v3: - Drop panthor_sched_tick_ctx::min_priority (no longer relevant) - Collect R-b Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reviewed-by: Steven Price Reviewed-by: Chia-I Wu Link: https://patch.msgid.link/20251128094839.3856402-7-boris.brezillon@collabora.com Signed-off-by: Boris Brezillon Signed-off-by: Sasha Levin

drm/panthor: Fix immediate ticking on a disabled tick

2026-03-04T12:19:48+00:00

[ Upstream commit 4356d21994f4ff5c87305b874939b359f16f6677 ] We have a few paths where we schedule the tick work immediately without changing the resched_target. If the tick was stopped, this would lead to a remaining_jiffies that's always > 0, and it wouldn't force a full tick in that case. Add extra checks to cover that case properly. v2: - Fix typo - Simplify the code as suggested by Steve v3: - Collect R-b Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reviewed-by: Steven Price Reviewed-by: Chia-I Wu Link: https://patch.msgid.link/20251128094839.3856402-6-boris.brezillon@collabora.com Signed-off-by: Boris Brezillon Signed-off-by: Sasha Levin

drm/panthor: Fix the group priority rotation logic

2026-03-04T12:19:48+00:00

[ Upstream commit 55429c51d5db3db24c2ad561944c6a0ca922d476 ] When rotating group priorities, we want the group with the highest priority to go back to the end of the queue, and all other active groups to get their priority bumped, otherwise some groups will never get a chance to run with the highest priority. This implies moving the rotation itself to tick_work(), and only dealing with old group ordering in tick_ctx_insert_old_group(). v2: - Add R-b - Fix the commit message v3: - Drop the full_tick argument in tick_ctx_init() - Collect R-b Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Reviewed-by: Steven Price Reviewed-by: Chia-I Wu Link: https://patch.msgid.link/20251128094839.3856402-5-boris.brezillon@collabora.com Signed-off-by: Boris Brezillon Signed-off-by: Sasha Levin