Re: [PATCH v3 1/2] drm/sched: Refactor ring mirror list handling.

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Am 17.12.18 um 17:57 schrieb Grodzovsky, Andrey:
>
> On 12/17/2018 10:27 AM, Christian König wrote:
>> Am 10.12.18 um 22:43 schrieb Andrey Grodzovsky:
>>> Decauple sched threads stop and start and ring mirror
>>> list handling from the policy of what to do about the
>>> guilty jobs.
>>> When stoppping the sched thread and detaching sched fences
>>> from non signaled HW fenes wait for all signaled HW fences
>>> to complete before rerunning the jobs.
>>>
>>> v2: Fix resubmission of guilty job into HW after refactoring.
>>>
>>> Suggested-by: Christian Koenig <Christian.Koenig@xxxxxxx>
>>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
>>> ---
>>>    drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  17 +++--
>>>    drivers/gpu/drm/etnaviv/etnaviv_sched.c    |   8 +--
>>>    drivers/gpu/drm/scheduler/sched_main.c     | 110
>>> ++++++++++++++++++-----------
>>>    drivers/gpu/drm/v3d/v3d_sched.c            |  11 +--
>>>    include/drm/gpu_scheduler.h                |  10 ++-
>>>    5 files changed, 95 insertions(+), 61 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> index ef36cc5..42111d5 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> @@ -3292,17 +3292,16 @@ static int
>>> amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>>>        /* block all schedulers and reset given job's ring */
>>>        for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
>>>            struct amdgpu_ring *ring = adev->rings[i];
>>> +        bool park_only = job && job->base.sched != &ring->sched;
>>>              if (!ring || !ring->sched.thread)
>>>                continue;
>>>    -        kthread_park(ring->sched.thread);
>>> +        drm_sched_stop(&ring->sched, job ? &job->base : NULL,
>>> park_only);
>>>    -        if (job && job->base.sched != &ring->sched)
>>> +        if (park_only)
>>>                continue;
>>>    -        drm_sched_hw_job_reset(&ring->sched, job ? &job->base :
>>> NULL);
>>> -
>>>            /* after all hw jobs are reset, hw fence is meaningless, so
>>> force_completion */
>>>            amdgpu_fence_driver_force_completion(ring);
>>>        }
>>> @@ -3445,6 +3444,7 @@ static void
>>> amdgpu_device_post_asic_reset(struct amdgpu_device *adev,
>>>                          struct amdgpu_job *job)
>>>    {
>>>        int i;
>>> +    bool unpark_only;
>>>          for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
>>>            struct amdgpu_ring *ring = adev->rings[i];
>>> @@ -3456,10 +3456,13 @@ static void
>>> amdgpu_device_post_asic_reset(struct amdgpu_device *adev,
>>>             * or all rings (in the case @job is NULL)
>>>             * after above amdgpu_reset accomplished
>>>             */
>>> -        if ((!job || job->base.sched == &ring->sched) &&
>>> !adev->asic_reset_res)
>>> -            drm_sched_job_recovery(&ring->sched);
>>> +        unpark_only = (job && job->base.sched != &ring->sched) ||
>>> +                   adev->asic_reset_res;
>>> +
>>> +        if (!unpark_only)
>>> +            drm_sched_resubmit_jobs(&ring->sched);
>>>    -        kthread_unpark(ring->sched.thread);
>>> +        drm_sched_start(&ring->sched, unpark_only);
>>>        }
>>>          if (!amdgpu_device_has_dc_support(adev)) {
>>> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>> b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>> index 49a6763..fab3b51 100644
>>> --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>> +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>> @@ -109,16 +109,16 @@ static void etnaviv_sched_timedout_job(struct
>>> drm_sched_job *sched_job)
>>>        }
>>>          /* block scheduler */
>>> -    kthread_park(gpu->sched.thread);
>>> -    drm_sched_hw_job_reset(&gpu->sched, sched_job);
>>> +    drm_sched_stop(&gpu->sched, sched_job, false);
>>>          /* get the GPU back into the init state */
>>>        etnaviv_core_dump(gpu);
>>>        etnaviv_gpu_recover_hang(gpu);
>>>    +    drm_sched_resubmit_jobs(&gpu->sched);
>>> +
>>>        /* restart scheduler after GPU is usable again */
>>> -    drm_sched_job_recovery(&gpu->sched);
>>> -    kthread_unpark(gpu->sched.thread);
>>> +    drm_sched_start(&gpu->sched);
>>>    }
>>>      static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
>>> diff --git a/drivers/gpu/drm/scheduler/sched_main.c
>>> b/drivers/gpu/drm/scheduler/sched_main.c
>>> index dbb6906..cdf95e2 100644
>>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>>> @@ -60,8 +60,6 @@
>>>      static void drm_sched_process_job(struct dma_fence *f, struct
>>> dma_fence_cb *cb);
>>>    -static void drm_sched_expel_job_unlocked(struct drm_sched_job
>>> *s_job);
>>> -
>>>    /**
>>>     * drm_sched_rq_init - initialize a given run queue struct
>>>     *
>>> @@ -342,13 +340,21 @@ static void drm_sched_job_timedout(struct
>>> work_struct *work)
>>>     * @bad: bad scheduler job
>>>     *
>>>     */
>>> -void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, struct
>>> drm_sched_job *bad)
>>> +void drm_sched_stop(struct drm_gpu_scheduler *sched, struct
>>> drm_sched_job *bad,
>>> +            bool park_only)
>>>    {
>>>        struct drm_sched_job *s_job;
>>>        struct drm_sched_entity *entity, *tmp;
>>>        unsigned long flags;
>>> +    struct list_head wait_list;
>>>        int i;
>>>    +    kthread_park(sched->thread);
>>> +    if (park_only)
>>> +        return;
>> Removing the callback needs to be done for all engines, not just the
>> one where the bad job is on.
> Is it because you assume that during full GPU reset we might kill
> healthy jobs who were still in progress in HW pipe and so we need to
> manually recover them
> just as we do with the guilty job's engine ?

Yes, exactly.

Christian.

>
> Andrey
>
>>> +
>>> +    INIT_LIST_HEAD(&wait_list);
>>> +
>>>        spin_lock_irqsave(&sched->job_list_lock, flags);
>>>        list_for_each_entry_reverse(s_job, &sched->ring_mirror_list,
>>> node) {
>>>            if (s_job->s_fence->parent &&
>>> @@ -358,9 +364,24 @@ void drm_sched_hw_job_reset(struct
>>> drm_gpu_scheduler *sched, struct drm_sched_jo
>>>                s_job->s_fence->parent = NULL;
>>>                atomic_dec(&sched->hw_rq_count);
>>>            }
>>> +        else {
>>> +            /* TODO Is it get/put neccessey here ? */
>>> +            dma_fence_get(&s_job->s_fence->finished);
>>> +            list_add(&s_job->finish_node, &wait_list);
>>> +        }
>>>        }
>>>        spin_unlock_irqrestore(&sched->job_list_lock, flags);
>>>    +    /*
>>> +     * Verify all the signaled jobs in mirror list are removed from
>>> the ring
>>> +     * We rely on the fact that any finish_work in progress will
>>> wait for this
>>> +     * handler to complete before releasing all of the jobs we iterate.
>>> +     */
>>> +    list_for_each_entry(s_job, &wait_list, finish_node) {
>>> +        dma_fence_wait(&s_job->s_fence->finished, false);
>>> +        dma_fence_put(&s_job->s_fence->finished);
>>> +    }
>>> +
>> Increasing a bad jobs karma should be a separate function.
>>
>> Christian.
>>
>>>        if (bad && bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
>>>            atomic_inc(&bad->karma);
>>>            /* don't increase @bad's karma if it's from KERNEL RQ,
>>> @@ -385,7 +406,7 @@ void drm_sched_hw_job_reset(struct
>>> drm_gpu_scheduler *sched, struct drm_sched_jo
>>>            }
>>>        }
>>>    }
>>> -EXPORT_SYMBOL(drm_sched_hw_job_reset);
>>> +EXPORT_SYMBOL(drm_sched_stop);
>>>      /**
>>>     * drm_sched_job_recovery - recover jobs after a reset
>>> @@ -393,33 +414,21 @@ EXPORT_SYMBOL(drm_sched_hw_job_reset);
>>>     * @sched: scheduler instance
>>>     *
>>>     */
>>> -void drm_sched_job_recovery(struct drm_gpu_scheduler *sched)
>>> +void drm_sched_start(struct drm_gpu_scheduler *sched, bool unpark_only)
>>>    {
>>>        struct drm_sched_job *s_job, *tmp;
>>> -    bool found_guilty = false;
>>>        unsigned long flags;
>>>        int r;
>>>    -    spin_lock_irqsave(&sched->job_list_lock, flags);
>>> +    if (unpark_only)
>>> +        goto unpark;
>>> +
>>> +    spin_lock_irqsave(&sched->job_list_lock, flags);
>>>        list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list,
>>> node) {
>>>            struct drm_sched_fence *s_fence = s_job->s_fence;
>>> -        struct dma_fence *fence;
>>> -        uint64_t guilty_context;
>>> -
>>> -        if (!found_guilty && atomic_read(&s_job->karma) >
>>> sched->hang_limit) {
>>> -            found_guilty = true;
>>> -            guilty_context = s_job->s_fence->scheduled.context;
>>> -        }
>>> -
>>> -        if (found_guilty && s_job->s_fence->scheduled.context ==
>>> guilty_context)
>>> -            dma_fence_set_error(&s_fence->finished, -ECANCELED);
>>> -
>>> -        spin_unlock_irqrestore(&sched->job_list_lock, flags);
>>> -        fence = sched->ops->run_job(s_job);
>>> -        atomic_inc(&sched->hw_rq_count);
>>> +        struct dma_fence *fence = s_job->s_fence->parent;
>>>              if (fence) {
>>> -            s_fence->parent = dma_fence_get(fence);
>>>                r = dma_fence_add_callback(fence, &s_fence->cb,
>>>                               drm_sched_process_job);
>>>                if (r == -ENOENT)
>>> @@ -427,18 +436,47 @@ void drm_sched_job_recovery(struct
>>> drm_gpu_scheduler *sched)
>>>                else if (r)
>>>                    DRM_ERROR("fence add callback failed (%d)\n",
>>>                          r);
>>> -            dma_fence_put(fence);
>>> -        } else {
>>> -            if (s_fence->finished.error < 0)
>>> -                drm_sched_expel_job_unlocked(s_job);
>>> +        } else
>>>                drm_sched_process_job(NULL, &s_fence->cb);
>>> -        }
>>> -        spin_lock_irqsave(&sched->job_list_lock, flags);
>>>        }
>>> +
>>>        drm_sched_start_timeout(sched);
>>>        spin_unlock_irqrestore(&sched->job_list_lock, flags);
>>> +
>>> +unpark:
>>> +    kthread_unpark(sched->thread);
>>>    }
>>> -EXPORT_SYMBOL(drm_sched_job_recovery);
>>> +EXPORT_SYMBOL(drm_sched_start);
>>> +
>>> +/**
>>> + * drm_sched_resubmit_jobs - helper to relunch job from mirror ring
>>> list
>>> + *
>>> + * @sched: scheduler instance
>>> + *
>>> + */
>>> +void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched)
>>> +{
>>> +    struct drm_sched_job *s_job, *tmp;
>>> +    uint64_t guilty_context;
>>> +    bool found_guilty = false;
>>> +
>>> +    /*TODO DO we need spinlock here ? */
>>> +    list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list,
>>> node) {
>>> +        struct drm_sched_fence *s_fence = s_job->s_fence;
>>> +
>>> +        if (!found_guilty && atomic_read(&s_job->karma) >
>>> sched->hang_limit) {
>>> +            found_guilty = true;
>>> +            guilty_context = s_job->s_fence->scheduled.context;
>>> +        }
>>> +
>>> +        if (found_guilty && s_job->s_fence->scheduled.context ==
>>> guilty_context)
>>> +            dma_fence_set_error(&s_fence->finished, -ECANCELED);
>>> +
>>> +        s_job->s_fence->parent = sched->ops->run_job(s_job);
>>> +        atomic_inc(&sched->hw_rq_count);
>>> +    }
>>> +}
>>> +EXPORT_SYMBOL(drm_sched_resubmit_jobs);
>>>      /**
>>>     * drm_sched_job_init - init a scheduler job
>>> @@ -634,26 +672,14 @@ static int drm_sched_main(void *param)
>>>                    DRM_ERROR("fence add callback failed (%d)\n",
>>>                          r);
>>>                dma_fence_put(fence);
>>> -        } else {
>>> -            if (s_fence->finished.error < 0)
>>> -                drm_sched_expel_job_unlocked(sched_job);
>>> +        } else
>>>                drm_sched_process_job(NULL, &s_fence->cb);
>>> -        }
>>>              wake_up(&sched->job_scheduled);
>>>        }
>>>        return 0;
>>>    }
>>>    -static void drm_sched_expel_job_unlocked(struct drm_sched_job *s_job)
>>> -{
>>> -    struct drm_gpu_scheduler *sched = s_job->sched;
>>> -
>>> -    spin_lock(&sched->job_list_lock);
>>> -    list_del_init(&s_job->node);
>>> -    spin_unlock(&sched->job_list_lock);
>>> -}
>>> -
>>>    /**
>>>     * drm_sched_init - Init a gpu scheduler instance
>>>     *
>>> diff --git a/drivers/gpu/drm/v3d/v3d_sched.c
>>> b/drivers/gpu/drm/v3d/v3d_sched.c
>>> index 445b2ef..f99346a 100644
>>> --- a/drivers/gpu/drm/v3d/v3d_sched.c
>>> +++ b/drivers/gpu/drm/v3d/v3d_sched.c
>>> @@ -178,18 +178,19 @@ v3d_job_timedout(struct drm_sched_job *sched_job)
>>>        for (q = 0; q < V3D_MAX_QUEUES; q++) {
>>>            struct drm_gpu_scheduler *sched = &v3d->queue[q].sched;
>>>    -        kthread_park(sched->thread);
>>> -        drm_sched_hw_job_reset(sched, (sched_job->sched == sched ?
>>> -                           sched_job : NULL));
>>> +        drm_sched_stop(sched, (sched_job->sched == sched ?
>>> +                           sched_job : NULL), false);
>>>        }
>>>          /* get the GPU back into the init state */
>>>        v3d_reset(v3d);
>>>    +    for (q = 0; q < V3D_MAX_QUEUES; q++)
>>> +        drm_sched_resubmit_jobs(sched_job->sched);
>>> +
>>>        /* Unblock schedulers and restart their jobs. */
>>>        for (q = 0; q < V3D_MAX_QUEUES; q++) {
>>> -        drm_sched_job_recovery(&v3d->queue[q].sched);
>>> -        kthread_unpark(v3d->queue[q].sched.thread);
>>> +        drm_sched_start(&v3d->queue[q].sched, false);
>>>        }
>>>          mutex_unlock(&v3d->reset_lock);
>>> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
>>> index 47e1979..c94b592 100644
>>> --- a/include/drm/gpu_scheduler.h
>>> +++ b/include/drm/gpu_scheduler.h
>>> @@ -175,6 +175,7 @@ struct drm_sched_fence *to_drm_sched_fence(struct
>>> dma_fence *f);
>>>     *               finished to remove the job from the
>>>     *               @drm_gpu_scheduler.ring_mirror_list.
>>>     * @node: used to append this struct to the
>>> @drm_gpu_scheduler.ring_mirror_list.
>>> + * @finish_node: used in a list to wait on before resetting the
>>> scheduler
>>>     * @id: a unique id assigned to each job scheduled on the scheduler.
>>>     * @karma: increment on every hang caused by this job. If this
>>> exceeds the hang
>>>     *         limit of the scheduler then the job is marked guilty and
>>> will not
>>> @@ -193,6 +194,7 @@ struct drm_sched_job {
>>>        struct dma_fence_cb        finish_cb;
>>>        struct work_struct        finish_work;
>>>        struct list_head        node;
>>> +    struct list_head        finish_node;
>>>        uint64_t            id;
>>>        atomic_t            karma;
>>>        enum drm_sched_priority        s_priority;
>>> @@ -298,9 +300,11 @@ int drm_sched_job_init(struct drm_sched_job *job,
>>>                   void *owner);
>>>    void drm_sched_job_cleanup(struct drm_sched_job *job);
>>>    void drm_sched_wakeup(struct drm_gpu_scheduler *sched);
>>> -void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched,
>>> -                struct drm_sched_job *job);
>>> -void drm_sched_job_recovery(struct drm_gpu_scheduler *sched);
>>> +void drm_sched_stop(struct drm_gpu_scheduler *sched,
>>> +            struct drm_sched_job *job,
>>> +            bool park_only);
>>> +void drm_sched_start(struct drm_gpu_scheduler *sched, bool
>>> unpark_only);
>>> +void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched);
>>>    bool drm_sched_dependency_optimized(struct dma_fence* fence,
>>>                        struct drm_sched_entity *entity);
>>>    void drm_sched_fault(struct drm_gpu_scheduler *sched);

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