drm/amdkfd: implement restore_mqd callbacks for GFX12/12.1

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kfd_mqd_manager_v12.c (GFX 12.0) and kfd_mqd_manager_v12_1.c (GFX 12.1)
do not implement restore_mqd callbacks, leaving the function pointers
NULL and causing CRIU restore to return -EOPNOTSUPP on GFX12.

Implement restore_mqd for both compute and SDMA queues in
kfd_mqd_manager_v12.c and kfd_mqd_manager_v12_1.c, modeled after the
GFX 11 implementation with the following improvements:
- update cp_mqd_base_addr_lo/hi to the newly allocated MQD address,
  fixing a pre-existing gap shared with v11 where the in-MQD copy
  still pointed at the old checkpoint-time address after restore
- memset the full allocation before memcpy for compute queues to avoid
  stale data in the GTT sub-allocator tail; SDMA MQDs use sizeof(*m)
  since they are packed at mqd_size stride in a shared BO

checkpoint_mqd registration is deferred to a follow-up patch that also
implements get_checkpoint_info, so that checkpoint and restore are
enabled together as a complete and testable unit.

Note: GFX12.1 restore handles XCC0 only. Multi-XCC CRIU restore is
currently unreachable due to a separate validation issue in
kfd_criu_restore_queue(). A pr_warn_once() is emitted if a multi-XCC
device is encountered.

Signed-off-by: Vladimir Marioukhine <Vladimir.Marioukhine@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit b1f9601237)
Cc: stable@vger.kernel.org

...

This commit is contained in:

Vladimir Marioukhine 2026-08-12 13:19:46 -04:00 • committed by Alex Deucher

parent 63e19ef3dd

commit 5f28bb1c2c

3 changed files with 132 additions and 2 deletions

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7

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

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59

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v12.c

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68

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v12_1.c

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