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drm/amdkfd: Fix race in GWS queue scheduling

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commit cfb05257ae168a0496c7637e1d9e3ab8a25cbffe upstream.

q->gws is not updated atomically with qpd->mapped_gws_queue. If a
runlist is created between pqm_set_gws and update_queue it will
contain a queue which uses GWS in a process with no GWS allocated.
This will result in a scheduler hang.

Use q->properties.is_gws which is changed while holding the DQM lock.

Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit b98370220eb3110e82248e3354e16a489a492cfb)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jay Cornwall
2025-06-11 09:52:14 -05:00
committed by Greg Kroah-Hartman
parent 7946a10f8d
commit 76115eafad
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdkfd/kfd_packet_manager_v9.c
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@@ -225,7 +225,7 @@ static int pm_map_queues_v9(struct packet_manager *pm, uint32_t *buffer,
packet->bitfields2.engine_sel = packet->bitfields2.engine_sel =
engine_sel__mes_map_queues__compute_vi; engine_sel__mes_map_queues__compute_vi;
packet->bitfields2.gws_control_queue = q->gws ? 1 : 0; packet->bitfields2.gws_control_queue = q->properties.is_gws ? 1 : 0;
packet->bitfields2.extended_engine_sel = packet->bitfields2.extended_engine_sel =
extended_engine_sel__mes_map_queues__legacy_engine_sel; extended_engine_sel__mes_map_queues__legacy_engine_sel;
packet->bitfields2.queue_type = packet->bitfields2.queue_type =