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drm/amdgpu/userq: make sure queue is valid in the hang_detect_work

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Thread 1: Running amdgpu_userq_destroy which eventually remove
the queue from door bell and set userq_mgr = NULL.

Thread2: An interrupt might have scheduled the hang_detect_work
which still need userq_mgr to be valid but could get an NULL
ptrs.

To fix that make sure we cancel the hang_detect_work again before
setting userq_mgr to NULL.

Along with that we also need all the queue va to remain valid till
we could be running anything on the queue and hence moving the
userq_va post hang_detect handler is cancelled.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 1a66ceb98b137d18d303b9889f0e7d8c4db73943)
This commit is contained in:
Sunil Khatri
2026-05-18 19:58:08 +05:30
committed by Alex Deucher
parent a00caed230
commit cf4aafdcce
1 changed files with 7 additions and 7 deletions
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14
drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
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@@ -427,8 +427,6 @@ static void amdgpu_userq_cleanup(struct amdgpu_usermode_queue *queue)
xa_erase_irq(&adev->userq_doorbell_xa, queue->doorbell_index);
amdgpu_userq_fence_driver_free(queue);
queue->fence_drv = NULL;
queue->userq_mgr = NULL;
list_del(&queue->userq_va_list);
up_read(&adev->reset_domain->sem);
}
@@ -619,11 +617,6 @@ amdgpu_userq_destroy(struct amdgpu_userq_mgr *uq_mgr, struct amdgpu_usermode_que
/* Cancel any pending hang detection work and cleanup */
cancel_delayed_work_sync(&queue->hang_detect_work);
amdgpu_bo_reserve(vm->root.bo, true);
amdgpu_userq_buffer_vas_list_cleanup(adev, queue);
amdgpu_bo_unreserve(vm->root.bo);
mutex_lock(&uq_mgr->userq_mutex);
amdgpu_userq_wait_for_last_fence(queue);
@@ -635,6 +628,13 @@ amdgpu_userq_destroy(struct amdgpu_userq_mgr *uq_mgr, struct amdgpu_usermode_que
amdgpu_userq_cleanup(queue);
mutex_unlock(&uq_mgr->userq_mutex);
cancel_delayed_work_sync(&queue->hang_detect_work);
amdgpu_bo_reserve(vm->root.bo, true);
amdgpu_userq_buffer_vas_list_cleanup(adev, queue);
amdgpu_bo_unreserve(vm->root.bo);
list_del(&queue->userq_va_list);
queue->userq_mgr = NULL;
amdgpu_bo_reserve(queue->db_obj.obj, true);
amdgpu_bo_unpin(queue->db_obj.obj);
amdgpu_bo_unreserve(queue->db_obj.obj);