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drm/imagination: Fix double call to drm_sched_entity_fini()

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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 fd177135f0 ("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: eaf01ee5ba ("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>
This commit is contained in:
Brajesh Gupta 2026-06-30 21:10:07 +05:30 committed by Alessio Belle
parent ec3304ddfd
commit 4af24c27a3
3 changed files with 15 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/gpu/drm/imagination/pvr_context.c
View File

@ -161,22 +161,24 @@ ctx_fw_data_init(void *cpu_ptr, void *priv)
/**
* 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;
}
}
@ -240,7 +242,7 @@ static int pvr_context_create_queues(struct pvr_context *ctx,
return -EINVAL;
err_destroy_queues:
pvr_context_destroy_queues(ctx);
pvr_context_destroy_queues(ctx, true);
return err;
}
@ -349,7 +351,7 @@ int pvr_context_create(struct pvr_file *pvr_file, struct drm_pvr_ioctl_create_co
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:
/*
@ -384,7 +386,7 @@ pvr_context_release(struct kref *ref_count)
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);

6
drivers/gpu/drm/imagination/pvr_queue.c
View File

@ -1439,11 +1439,12 @@ void pvr_queue_kill(struct pvr_queue *queue)
/**
* 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;
@ -1453,7 +1454,8 @@ void pvr_queue_destroy(struct pvr_queue *queue)
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);

2
drivers/gpu/drm/imagination/pvr_queue.h
View File

@ -158,7 +158,7 @@ struct pvr_queue *pvr_queue_create(struct pvr_context *ctx,
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);