Hi, I've pushed this commit as I got a verbal Acked-by from Christian in our kernel meeting this morning.
Matt, please rebase your patches to drm-misc-next.
Regards,
Luben
On 2023-10-26 11:20, Luben Tuikov wrote:
> Ping!
>
> On 2023-10-22 23:22, Luben Tuikov wrote:
>> The GPU scheduler has now a variable number of run-queues, which are set up
>> at
>> drm_sched_init() time. This way, each driver announces how many run-queues it
>> requires (supports) per each GPU scheduler it creates. Note, that run-queues
>> correspond to scheduler "priorities", thus if the number of run-queues is set
>> to 1 at drm_sched_init(), then that scheduler supports a single run-queue,
>> i.e. single "priority". If a driver further sets a single entity per
>> run-queue, then this creates a 1-to-1 correspondence between a scheduler and
>> a scheduled entity.
>>
>> Cc: Lucas Stach <l.st...@pengutronix.de>
>> Cc: Russell King <linux+etna...@armlinux.org.uk>
>> Cc: Qiang Yu <yuq...@gmail.com>
>> Cc: Rob Clark <robdcl...@gmail.com>
>> Cc: Abhinav Kumar <quic_abhin...@quicinc.com>
>> Cc: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
>> Cc: Danilo Krummrich <d...@redhat.com>
>> Cc: Matthew Brost <matthew.br...@intel.com>
>> Cc: Boris Brezillon <boris.brezil...@collabora.com>
>> Cc: Alex Deucher <alexander.deuc...@amd.com>
>> Cc: Christian König <christian.koe...@amd.com>
>> Cc: Emma Anholt <e...@anholt.net>
>> Cc: etna...@lists.freedesktop.org
>> Cc: l...@lists.freedesktop.org
>> Cc: linux-arm-...@vger.kernel.org
>> Cc: freedr...@lists.freedesktop.org
>> Cc: nouveau@lists.freedesktop.org
>> Cc: dri-de...@lists.freedesktop.org
>> Signed-off-by: Luben Tuikov <luben.tui...@amd.com>
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
>> drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 4 +-
>> drivers/gpu/drm/etnaviv/etnaviv_sched.c | 1 +
>> drivers/gpu/drm/lima/lima_sched.c | 4 +-
>> drivers/gpu/drm/msm/msm_ringbuffer.c | 5 +-
>> drivers/gpu/drm/nouveau/nouveau_sched.c | 1 +
>> drivers/gpu/drm/panfrost/panfrost_job.c | 1 +
>> drivers/gpu/drm/scheduler/sched_entity.c | 18 +++++-
>> drivers/gpu/drm/scheduler/sched_main.c | 74 ++++++++++++++++++----
>> drivers/gpu/drm/v3d/v3d_sched.c | 5 ++
>> include/drm/gpu_scheduler.h | 9 ++-
>> 11 files changed, 98 insertions(+), 25 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index 2b8356699f235d..251995a90bbe69 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -2280,6 +2280,7 @@ static int amdgpu_device_init_schedulers(struct
>> amdgpu_device *adev)
>> }
>>
>> r = drm_sched_init(&ring->sched, &amdgpu_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> ring->num_hw_submission, 0,
>> timeout, adev->reset_domain->wq,
>> ring->sched_score, ring->name,
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> index 78476bc75b4e1d..1f357198533f3e 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>> @@ -325,8 +325,8 @@ void amdgpu_job_stop_all_jobs_on_sched(struct
>> drm_gpu_scheduler *sched)
>> int i;
>>
>> /* Signal all jobs not yet scheduled */
>> - for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN;
>> i--) {
>> - struct drm_sched_rq *rq = &sched->sched_rq[i];
>> + for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
>> + struct drm_sched_rq *rq = sched->sched_rq[i];
>> spin_lock(&rq->lock);
>> list_for_each_entry(s_entity, &rq->entities, list) {
>> while ((s_job =
>> to_drm_sched_job(spsc_queue_pop(&s_entity->job_queue)))) {
>> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>> b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>> index 345fec6cb1a4c1..9b79f218e21afc 100644
>> --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>> +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>> @@ -135,6 +135,7 @@ int etnaviv_sched_init(struct etnaviv_gpu *gpu)
>> int ret;
>>
>> ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
>> msecs_to_jiffies(500), NULL, NULL,
>> dev_name(gpu->dev), gpu->dev);
>> diff --git a/drivers/gpu/drm/lima/lima_sched.c
>> b/drivers/gpu/drm/lima/lima_sched.c
>> index ffd91a5ee29901..295f0353a02e58 100644
>> --- a/drivers/gpu/drm/lima/lima_sched.c
>> +++ b/drivers/gpu/drm/lima/lima_sched.c
>> @@ -488,7 +488,9 @@ int lima_sched_pipe_init(struct lima_sched_pipe *pipe,
>> const char *name)
>>
>> INIT_WORK(&pipe->recover_work, lima_sched_recover_work);
>>
>> - return drm_sched_init(&pipe->base, &lima_sched_ops, 1,
>> + return drm_sched_init(&pipe->base, &lima_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> + 1,
>> lima_job_hang_limit,
>> msecs_to_jiffies(timeout), NULL,
>> NULL, name, pipe->ldev->dev);
>> diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c
>> b/drivers/gpu/drm/msm/msm_ringbuffer.c
>> index 40c0bc35a44cee..95257ab0185dc4 100644
>> --- a/drivers/gpu/drm/msm/msm_ringbuffer.c
>> +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
>> @@ -95,8 +95,9 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu
>> *gpu, int id,
>> sched_timeout = MAX_SCHEDULE_TIMEOUT;
>>
>> ret = drm_sched_init(&ring->sched, &msm_sched_ops,
>> - num_hw_submissions, 0, sched_timeout,
>> - NULL, NULL, to_msm_bo(ring->bo)->name, gpu->dev->dev);
>> + DRM_SCHED_PRIORITY_COUNT,
>> + num_hw_submissions, 0, sched_timeout,
>> + NULL, NULL, to_msm_bo(ring->bo)->name,
>> gpu->dev->dev);
>> if (ret) {
>> goto fail;
>> }
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_sched.c
>> b/drivers/gpu/drm/nouveau/nouveau_sched.c
>> index 3b7ea522122605..7c376c4ccdcf9b 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_sched.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_sched.c
>> @@ -436,6 +436,7 @@ int nouveau_sched_init(struct nouveau_drm *drm)
>> return -ENOMEM;
>>
>> return drm_sched_init(sched, &nouveau_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> NOUVEAU_SCHED_HW_SUBMISSIONS, 0, job_hang_limit,
>> NULL, NULL, "nouveau_sched", drm->dev->dev);
>> }
>> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c
>> b/drivers/gpu/drm/panfrost/panfrost_job.c
>> index a8b4827dc42586..95510d481fab3a 100644
>> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
>> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
>> @@ -832,6 +832,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
>>
>> ret = drm_sched_init(&js->queue[j].sched,
>> &panfrost_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> nentries, 0,
>> msecs_to_jiffies(JOB_TIMEOUT_MS),
>> pfdev->reset.wq,
>> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c
>> b/drivers/gpu/drm/scheduler/sched_entity.c
>> index a42763e1429dc1..409e4256f6e7d6 100644
>> --- a/drivers/gpu/drm/scheduler/sched_entity.c
>> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
>> @@ -75,8 +75,20 @@ int drm_sched_entity_init(struct drm_sched_entity *entity,
>> RCU_INIT_POINTER(entity->last_scheduled, NULL);
>> RB_CLEAR_NODE(&entity->rb_tree_node);
>>
>> - if(num_sched_list)
>> - entity->rq = &sched_list[0]->sched_rq[entity->priority];
>> + if (!sched_list[0]->sched_rq) {
>> + /* Warn drivers not to do this and to fix their DRM
>> + * calling order.
>> + */
>> + pr_warn("%s: called with uninitialized scheduler\n", __func__);
>> + } else if (num_sched_list) {
>> + /* The "priority" of an entity cannot exceed the number
>> + * of run-queues of a scheduler.
>> + */
>> + if (entity->priority >= sched_list[0]->num_rqs)
>> + entity->priority = max_t(u32, sched_list[0]->num_rqs,
>> + DRM_SCHED_PRIORITY_MIN);
>> + entity->rq = sched_list[0]->sched_rq[entity->priority];
>> + }
>>
>> init_completion(&entity->entity_idle);
>>
>> @@ -533,7 +545,7 @@ void drm_sched_entity_select_rq(struct drm_sched_entity
>> *entity)
>>
>> spin_lock(&entity->rq_lock);
>> sched = drm_sched_pick_best(entity->sched_list, entity->num_sched_list);
>> - rq = sched ? &sched->sched_rq[entity->priority] : NULL;
>> + rq = sched ? sched->sched_rq[entity->priority] : NULL;
>> if (rq != entity->rq) {
>> drm_sched_rq_remove_entity(entity->rq, entity);
>> entity->rq = rq;
>> diff --git a/drivers/gpu/drm/scheduler/sched_main.c
>> b/drivers/gpu/drm/scheduler/sched_main.c
>> index 5a3a622fc672f3..99797a8c836ac7 100644
>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>> @@ -632,8 +632,14 @@ int drm_sched_job_init(struct drm_sched_job *job,
>> struct drm_sched_entity *entity,
>> void *owner)
>> {
>> - if (!entity->rq)
>> + if (!entity->rq) {
>> + /* This will most likely be followed by missing frames
>> + * or worse--a blank screen--leave a trail in the
>> + * logs, so this can be debugged easier.
>> + */
>> + drm_err(job->sched, "%s: entity has no rq!\n", __func__);
>> return -ENOENT;
>> + }
>>
>> job->entity = entity;
>> job->s_fence = drm_sched_fence_alloc(entity, owner);
>> @@ -671,7 +677,7 @@ void drm_sched_job_arm(struct drm_sched_job *job)
>> sched = entity->rq->sched;
>>
>> job->sched = sched;
>> - job->s_priority = entity->rq - sched->sched_rq;
>> + job->s_priority = entity->priority;
>> job->id = atomic64_inc_return(&sched->job_id_count);
>>
>> drm_sched_fence_init(job->s_fence, job->entity);
>> @@ -888,10 +894,10 @@ drm_sched_select_entity(struct drm_gpu_scheduler
>> *sched)
>> return NULL;
>>
>> /* Kernel run queue has higher priority than normal run queue*/
>> - for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN;
>> i--) {
>> + for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
>> entity = drm_sched_policy == DRM_SCHED_POLICY_FIFO ?
>> - drm_sched_rq_select_entity_fifo(&sched->sched_rq[i]) :
>> - drm_sched_rq_select_entity_rr(&sched->sched_rq[i]);
>> + drm_sched_rq_select_entity_fifo(sched->sched_rq[i]) :
>> + drm_sched_rq_select_entity_rr(sched->sched_rq[i]);
>> if (entity)
>> break;
>> }
>> @@ -1071,6 +1077,7 @@ static int drm_sched_main(void *param)
>> *
>> * @sched: scheduler instance
>> * @ops: backend operations for this scheduler
>> + * @num_rqs: number of runqueues, one for each priority, up to
>> DRM_SCHED_PRIORITY_COUNT
>> * @hw_submission: number of hw submissions that can be in flight
>> * @hang_limit: number of times to allow a job to hang before dropping it
>> * @timeout: timeout value in jiffies for the scheduler
>> @@ -1084,11 +1091,12 @@ static int drm_sched_main(void *param)
>> */
>> int drm_sched_init(struct drm_gpu_scheduler *sched,
>> const struct drm_sched_backend_ops *ops,
>> - unsigned hw_submission, unsigned hang_limit,
>> + u32 num_rqs, uint32_t hw_submission, unsigned int hang_limit,
>> long timeout, struct workqueue_struct *timeout_wq,
>> atomic_t *score, const char *name, struct device *dev)
>> {
>> int i, ret;
>> +
>> sched->ops = ops;
>> sched->hw_submission_limit = hw_submission;
>> sched->name = name;
>> @@ -1097,8 +1105,36 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
>> sched->hang_limit = hang_limit;
>> sched->score = score ? score : &sched->_score;
>> sched->dev = dev;
>> - for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_COUNT; i++)
>> - drm_sched_rq_init(sched, &sched->sched_rq[i]);
>> +
>> + if (num_rqs > DRM_SCHED_PRIORITY_COUNT) {
>> + /* This is a gross violation--tell drivers what the problem is.
>> + */
>> + drm_err(sched, "%s: num_rqs cannot be greater than
>> DRM_SCHED_PRIORITY_COUNT\n",
>> + __func__);
>> + return -EINVAL;
>> + } else if (sched->sched_rq) {
>> + /* Not an error, but warn anyway so drivers can
>> + * fine-tune their DRM calling order, and return all
>> + * is good.
>> + */
>> + drm_warn(sched, "%s: scheduler already initialized!\n",
>> __func__);
>> + return 0;
>> + }
>> +
>> + sched->sched_rq = kmalloc_array(num_rqs, sizeof(*sched->sched_rq),
>> + GFP_KERNEL | __GFP_ZERO);
>> + if (!sched->sched_rq) {
>> + drm_err(sched, "%s: out of memory for sched_rq\n", __func__);
>> + return -ENOMEM;
>> + }
>> + sched->num_rqs = num_rqs;
>> + ret = -ENOMEM;
>> + for (i = DRM_SCHED_PRIORITY_MIN; i < sched->num_rqs; i++) {
>> + sched->sched_rq[i] = kzalloc(sizeof(*sched->sched_rq[i]),
>> GFP_KERNEL);
>> + if (!sched->sched_rq[i])
>> + goto Out_unroll;
>> + drm_sched_rq_init(sched, sched->sched_rq[i]);
>> + }
>>
>> init_waitqueue_head(&sched->wake_up_worker);
>> init_waitqueue_head(&sched->job_scheduled);
>> @@ -1115,11 +1151,18 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
>> ret = PTR_ERR(sched->thread);
>> sched->thread = NULL;
>> DRM_DEV_ERROR(sched->dev, "Failed to create scheduler for
>> %s.\n", name);
>> - return ret;
>> + goto Out_unroll;
>> }
>>
>> sched->ready = true;
>> return 0;
>> +Out_unroll:
>> + for (--i ; i >= DRM_SCHED_PRIORITY_MIN; i--)
>> + kfree(sched->sched_rq[i]);
>> + kfree(sched->sched_rq);
>> + sched->sched_rq = NULL;
>> + drm_err(sched, "%s: Failed to setup GPU scheduler--out of memory\n",
>> __func__);
>> + return ret;
>> }
>> EXPORT_SYMBOL(drm_sched_init);
>>
>> @@ -1138,8 +1181,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
>> if (sched->thread)
>> kthread_stop(sched->thread);
>>
>> - for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN;
>> i--) {
>> - struct drm_sched_rq *rq = &sched->sched_rq[i];
>> + for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
>> + struct drm_sched_rq *rq = sched->sched_rq[i];
>>
>> spin_lock(&rq->lock);
>> list_for_each_entry(s_entity, &rq->entities, list)
>> @@ -1150,7 +1193,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
>> */
>> s_entity->stopped = true;
>> spin_unlock(&rq->lock);
>> -
>> + kfree(sched->sched_rq[i]);
>> }
>>
>> /* Wakeup everyone stuck in drm_sched_entity_flush for this scheduler */
>> @@ -1160,6 +1203,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
>> cancel_delayed_work_sync(&sched->work_tdr);
>>
>> sched->ready = false;
>> + kfree(sched->sched_rq);
>> + sched->sched_rq = NULL;
>> }
>> EXPORT_SYMBOL(drm_sched_fini);
>>
>> @@ -1186,9 +1231,10 @@ void drm_sched_increase_karma(struct drm_sched_job
>> *bad)
>> if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
>> atomic_inc(&bad->karma);
>>
>> - for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL;
>> + for (i = DRM_SCHED_PRIORITY_MIN;
>> + i < min_t(typeof(sched->num_rqs), sched->num_rqs,
>> DRM_SCHED_PRIORITY_KERNEL);
>> i++) {
>> - struct drm_sched_rq *rq = &sched->sched_rq[i];
>> + struct drm_sched_rq *rq = sched->sched_rq[i];
>>
>> spin_lock(&rq->lock);
>> list_for_each_entry_safe(entity, tmp, &rq->entities,
>> list) {
>> diff --git a/drivers/gpu/drm/v3d/v3d_sched.c
>> b/drivers/gpu/drm/v3d/v3d_sched.c
>> index 06238e6d7f5cda..038e1ae589c718 100644
>> --- a/drivers/gpu/drm/v3d/v3d_sched.c
>> +++ b/drivers/gpu/drm/v3d/v3d_sched.c
>> @@ -389,6 +389,7 @@ v3d_sched_init(struct v3d_dev *v3d)
>>
>> ret = drm_sched_init(&v3d->queue[V3D_BIN].sched,
>> &v3d_bin_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> hw_jobs_limit, job_hang_limit,
>> msecs_to_jiffies(hang_limit_ms), NULL,
>> NULL, "v3d_bin", v3d->drm.dev);
>> @@ -397,6 +398,7 @@ v3d_sched_init(struct v3d_dev *v3d)
>>
>> ret = drm_sched_init(&v3d->queue[V3D_RENDER].sched,
>> &v3d_render_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> hw_jobs_limit, job_hang_limit,
>> msecs_to_jiffies(hang_limit_ms), NULL,
>> NULL, "v3d_render", v3d->drm.dev);
>> @@ -405,6 +407,7 @@ v3d_sched_init(struct v3d_dev *v3d)
>>
>> ret = drm_sched_init(&v3d->queue[V3D_TFU].sched,
>> &v3d_tfu_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> hw_jobs_limit, job_hang_limit,
>> msecs_to_jiffies(hang_limit_ms), NULL,
>> NULL, "v3d_tfu", v3d->drm.dev);
>> @@ -414,6 +417,7 @@ v3d_sched_init(struct v3d_dev *v3d)
>> if (v3d_has_csd(v3d)) {
>> ret = drm_sched_init(&v3d->queue[V3D_CSD].sched,
>> &v3d_csd_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> hw_jobs_limit, job_hang_limit,
>> msecs_to_jiffies(hang_limit_ms), NULL,
>> NULL, "v3d_csd", v3d->drm.dev);
>> @@ -422,6 +426,7 @@ v3d_sched_init(struct v3d_dev *v3d)
>>
>> ret = drm_sched_init(&v3d->queue[V3D_CACHE_CLEAN].sched,
>> &v3d_cache_clean_sched_ops,
>> + DRM_SCHED_PRIORITY_COUNT,
>> hw_jobs_limit, job_hang_limit,
>> msecs_to_jiffies(hang_limit_ms), NULL,
>> NULL, "v3d_cache_clean", v3d->drm.dev);
>> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
>> index ac65f0626cfc91..d2fb81e34174dc 100644
>> --- a/include/drm/gpu_scheduler.h
>> +++ b/include/drm/gpu_scheduler.h
>> @@ -471,7 +471,9 @@ struct drm_sched_backend_ops {
>> * @hw_submission_limit: the max size of the hardware queue.
>> * @timeout: the time after which a job is removed from the scheduler.
>> * @name: name of the ring for which this scheduler is being used.
>> - * @sched_rq: priority wise array of run queues.
>> + * @num_rqs: Number of run-queues. This is at most DRM_SCHED_PRIORITY_COUNT,
>> + * as there's usually one run-queue per priority, but could be
>> less.
>> + * @sched_rq: An allocated array of run-queues of size @num_rqs;
>> * @wake_up_worker: the wait queue on which the scheduler sleeps until a job
>> * is ready to be scheduled.
>> * @job_scheduled: once @drm_sched_entity_do_release is called the scheduler
>> @@ -500,7 +502,8 @@ struct drm_gpu_scheduler {
>> uint32_t hw_submission_limit;
>> long timeout;
>> const char *name;
>> - struct drm_sched_rq sched_rq[DRM_SCHED_PRIORITY_COUNT];
>> + u32 num_rqs;
>> + struct drm_sched_rq **sched_rq;
>> wait_queue_head_t wake_up_worker;
>> wait_queue_head_t job_scheduled;
>> atomic_t hw_rq_count;
>> @@ -520,7 +523,7 @@ struct drm_gpu_scheduler {
>>
>> int drm_sched_init(struct drm_gpu_scheduler *sched,
>> const struct drm_sched_backend_ops *ops,
>> - uint32_t hw_submission, unsigned hang_limit,
>> + u32 num_rqs, uint32_t hw_submission, unsigned int hang_limit,
>> long timeout, struct workqueue_struct *timeout_wq,
>> atomic_t *score, const char *name, struct device *dev);
>>
>>
>> base-commit: 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1
>
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