Call sequence of double call:
pvr_context_destroy
pvr_context_kill_queues
pvr_queue_kill
drm_sched_entity_destroy
drm_sched_entity_fini // here
pvr_context_put
kref_put(..., pvr_context_release)
pvr_context_destroy_queues
pvr_queue_destroy
drm_sched_entity_fini // here
Call to drm_sched_entity_destroy() from pvr_context_kill_queues() calls
drm_sched_entity_flush() + drm_sched_entity_fini().
drm_sched_entity_flush() ensures all pending jobs are completed and
drm_sched_entity_fini() ensures no further submission is allowed as
per expectation from pvr_context_kill_queues(). Double call to
drm_sched_entity_fini() is misuse of the API so keep call only in
pvr_context_create() failure path.
Stack trace for issue with addition of refcounting for DRM entity
stats in commit
fd177135f0e6 ("drm/sched: Account entity GPU time"):
[ 789.490527] ------------[ cut here ]------------
[ 789.490559] refcount_t: underflow; use-after-free.
[ 789.490657] WARNING: lib/refcount.c:28 at refcount_warn_saturate+0xf4/0x144, CPU#0: kworker/u16:1/440
[ 789.490695] Modules linked in: powervr drm_gpuvm drm_exec gpu_sched drm_shmem_helper xhci_plat_hcd xhci_hcd dwc3 usbcore usb_common snd_soc_simple_card snd_soc_simple_card_utils sa2ul sha512 sha256 dwc3_am62 sha1 authenc rti_wdt libsha512 at24 sch_fq_codel fuse dm_mod ipv6
[ 789.490798] CPU: 0 UID: 0 PID: 440 Comm: kworker/u16:1 Not tainted
7.0.0-rc7-02049-g5e2c0700091b #22 PREEMPT
[ 789.490809] Hardware name: Texas Instruments AM625 SK (DT)
[ 789.490815] Workqueue: powervr-sched pvr_queue_fence_release_work [powervr]
[ 789.490868] pstate:
60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 789.490876] pc : refcount_warn_saturate+0xf4/0x144
[ 789.490884] lr : refcount_warn_saturate+0xf4/0x144
[ 789.490892] sp :
ffff8000822cbcc0
[ 789.490895] x29:
ffff8000822cbcc0 x28:
0000000000000000 x27:
0000000000000000
[ 789.490909] x26:
0000000000000000 x25:
ffff800081b1e338 x24:
ffff000004541405
[ 789.490922] x23:
ffff000004bea950 x22:
ffff00000042e400 x21:
ffff000007123e30
[ 789.490935] x20:
ffff000007123000 x19:
ffff000007a80d50 x18:
fffffffffffe7768
[ 789.490948] x17:
74736574202c6e6f x16:
697461746e656d65 x15:
ffff800081b269f0
[ 789.490962] x14:
0000000000000030 x13:
ffff800081b26a70 x12:
0000000000000211
[ 789.490975] x11:
00000000000000c0 x10:
0000000000000b50 x9 :
ffff8000822cbb30
[ 789.490988] x8 :
ffff0000014e7bb0 x7 :
ffff00007725e780 x6 :
0000000372a05f49
[ 789.491001] x5 :
0000000000000000 x4 :
0000000000000001 x3 :
0000000000000010
[ 789.491013] x2 :
0000000000000000 x1 :
0000000000000000 x0 :
ffff0000014e7000
[ 789.491027] Call trace:
[ 789.491032] refcount_warn_saturate+0xf4/0x144 (P)
[ 789.491043] drm_sched_entity_fini+0x164/0x18c [gpu_sched]
[ 789.491081] pvr_queue_destroy+0x64/0x134 [powervr]
[ 789.491110] pvr_context_destroy_queues+0x34/0x64 [powervr]
[ 789.491138] pvr_context_release+0x70/0xac [powervr]
[ 789.491166] pvr_context_put.part.0+0x5c/0x7c [powervr]
[ 789.491193] pvr_context_put+0x14/0x24 [powervr]
[ 789.491221] pvr_queue_fence_release_work+0x20/0x38 [powervr]
[ 789.491249] process_one_work+0x160/0x4c4
[ 789.491264] worker_thread+0x188/0x310
[ 789.491276] kthread+0x130/0x13c
[ 789.491287] ret_from_fork+0x10/0x20
[ 789.491300] ---[ end trace
0000000000000000 ]---
Fixes: eaf01ee5ba28 ("drm/imagination: Implement job submission and scheduling")
Cc: stable@vger.kernel.org
Signed-off-by: Brajesh Gupta <brajesh.gupta@imgtec.com>
Reviewed-by: Alessio Belle <alessio.belle@imgtec.com>
Link: https://patch.msgid.link/20260630-b4-sched_fix-v7-1-71aa39c62627@imgtec.com
Signed-off-by: Alessio Belle <alessio.belle@imgtec.com>
/**
* pvr_context_destroy_queues() - Destroy all queues attached to a context.
* @ctx: Context to destroy queues on.
+ * @cleanup_queue_entity: Whether to cleanup the queue entity e.g. context
+ * creation failure path.
*
* Should be called when the last reference to a context object is dropped.
* It releases all resources attached to the queues bound to this context.
*/
-static void pvr_context_destroy_queues(struct pvr_context *ctx)
+static void pvr_context_destroy_queues(struct pvr_context *ctx, bool cleanup_queue_entity)
{
switch (ctx->type) {
case DRM_PVR_CTX_TYPE_RENDER:
- pvr_queue_destroy(ctx->queues.fragment);
- pvr_queue_destroy(ctx->queues.geometry);
+ pvr_queue_destroy(ctx->queues.fragment, cleanup_queue_entity);
+ pvr_queue_destroy(ctx->queues.geometry, cleanup_queue_entity);
break;
case DRM_PVR_CTX_TYPE_COMPUTE:
- pvr_queue_destroy(ctx->queues.compute);
+ pvr_queue_destroy(ctx->queues.compute, cleanup_queue_entity);
break;
case DRM_PVR_CTX_TYPE_TRANSFER_FRAG:
- pvr_queue_destroy(ctx->queues.transfer);
+ pvr_queue_destroy(ctx->queues.transfer, cleanup_queue_entity);
break;
}
}
return -EINVAL;
err_destroy_queues:
- pvr_context_destroy_queues(ctx);
+ pvr_context_destroy_queues(ctx, true);
return err;
}
pvr_fw_object_destroy(ctx->fw_obj);
err_destroy_queues:
- pvr_context_destroy_queues(ctx);
+ pvr_context_destroy_queues(ctx, true);
err_free_ctx_id:
/*
spin_unlock(&pvr_dev->ctx_list_lock);
xa_erase(&pvr_dev->ctx_ids, ctx->ctx_id);
- pvr_context_destroy_queues(ctx);
+ pvr_context_destroy_queues(ctx, false);
pvr_fw_object_destroy(ctx->fw_obj);
kfree(ctx->data);
pvr_vm_context_put(ctx->vm_ctx);
/**
* pvr_queue_destroy() - Destroy a queue.
* @queue: The queue to destroy.
+ * @cleanup_queue_entity: Whether to cleanup the queue entity.
*
* Cleanup the queue and free the resources attached to it. Should be
* called from the context release function.
*/
-void pvr_queue_destroy(struct pvr_queue *queue)
+void pvr_queue_destroy(struct pvr_queue *queue, bool cleanup_queue_entity)
{
if (!queue)
return;
mutex_unlock(&queue->ctx->pvr_dev->queues.lock);
drm_sched_fini(&queue->scheduler);
- drm_sched_entity_fini(&queue->entity);
+ if (cleanup_queue_entity)
+ drm_sched_entity_fini(&queue->entity);
if (WARN_ON(queue->last_queued_job_scheduled_fence))
dma_fence_put(queue->last_queued_job_scheduled_fence);
void pvr_queue_kill(struct pvr_queue *queue);
-void pvr_queue_destroy(struct pvr_queue *queue);
+void pvr_queue_destroy(struct pvr_queue *queue, bool cleanup_queue_entity);
void pvr_queue_process(struct pvr_queue *queue);
projects / thirdparty / linux.git / commitdiff
