[PATCH 1/3] [RFC]drm: add syncobj timeline support v4

zhoucm1 zhoucm1 at amd.com
Wed Sep 12 10:20:51 UTC 2018



On 2018年09月12日 15:22, Christian König wrote:
> Ping? Have you seen my comments here?
Sorry, I didn't see this reply.  inline...

>
> Looks like you haven't addressed any of them in your last mail.
>
> Christian.
>
> Am 06.09.2018 um 09:25 schrieb Christian König:
>> Am 06.09.2018 um 08:25 schrieb Chunming Zhou:
>>> VK_KHR_timeline_semaphore:
>>> This extension introduces a new type of semaphore that has an 
>>> integer payload
>>> identifying a point in a timeline. Such timeline semaphores support the
>>
>> Drop the term semaphore here, better use syncobj.
This is from VK_KHR_timeline_semaphore extension describe, not my 
invention, I just quote it. In kernel side, we call syncobj, in UMD, 
they still call semaphore.

>>
>>> following operations:
>>>     * CPU query - A host operation that allows querying the payload 
>>> of the
>>>       timeline semaphore.
>>>     * CPU wait - A host operation that allows a blocking wait for a
>>>       timeline semaphore to reach a specified value.
>>>     * Device wait - A device operation that allows waiting for a
>>>       timeline semaphore to reach a specified value.
>>>     * Device signal - A device operation that allows advancing the
>>>       timeline semaphore to a specified value.
>>>
>>> Since it's a timeline, that means the front time point(PT) always is 
>>> signaled before the late PT.
>>> a. signal PT design:
>>> Signal PT fence N depends on PT[N-1] fence and signal opertion 
>>> fence, when PT[N] fence is signaled,
>>> the timeline will increase to value of PT[N].
>>> b. wait PT design:
>>> Wait PT fence is signaled by reaching timeline point value, when 
>>> timeline is increasing, will compare
>>> wait PTs value with new timeline value, if PT value is lower than 
>>> timeline value, then wait PT will be
>>> signaled, otherwise keep in list. semaphore wait operation can wait 
>>> on any point of timeline,
>>> so need a RB tree to order them. And wait PT could ahead of signal 
>>> PT, we need a sumission fence to
>>> perform that.
>>>
>>> v2:
>>> 1. remove unused DRM_SYNCOBJ_CREATE_TYPE_NORMAL. (Christian)
>>> 2. move unexposed denitions to .c file. (Daniel Vetter)
>>> 3. split up the change to drm_syncobj_find_fence() in a separate 
>>> patch. (Christian)
>>> 4. split up the change to drm_syncobj_replace_fence() in a separate 
>>> patch.
>>> 5. drop the submission_fence implementation and instead use 
>>> wait_event() for that. (Christian)
>>> 6. WARN_ON(point != 0) for NORMAL type syncobj case. (Daniel Vetter)
>>>
>>> v3:
>>> 1. replace normal syncobj with timeline implemenation. (Vetter and 
>>> Christian)
>>>      a. normal syncobj signal op will create a signal PT to tail of 
>>> signal pt list.
>>>      b. normal syncobj wait op will create a wait pt with last 
>>> signal point, and this wait PT is only signaled by related signal 
>>> point PT.
>>> 2. many bug fix and clean up
>>> 3. stub fence moving is moved to other patch.
>>>
>>> v4:
>>> 1. fix RB tree loop with while(node=rb_first(...)). (Christian)
>>> 2. fix syncobj lifecycle. (Christian)
>>> 3. only enable_signaling when there is wait_pt. (Christian)
>>>
>>> Tested by ./deqp-vk -n dEQP-VK*semaphore* for normal syncobj
>>>
>>> Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
>>> Cc: Christian Konig <christian.koenig at amd.com>
>>> Cc: Dave Airlie <airlied at redhat.com>
>>> Cc: Daniel Rakos <Daniel.Rakos at amd.com>
>>> Cc: Daniel Vetter <daniel at ffwll.ch>
>>> ---
>>>   drivers/gpu/drm/drm_syncobj.c              | 516 
>>> +++++++++++++++++----
>>>   drivers/gpu/drm/i915/i915_gem_execbuffer.c |   4 +-
>>>   include/drm/drm_syncobj.h                  |  78 ++--
>>>   include/uapi/drm/drm.h                     |   1 +
>>>   4 files changed, 448 insertions(+), 151 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/drm_syncobj.c 
>>> b/drivers/gpu/drm/drm_syncobj.c
>>> index e9ce623d049e..94b31de23858 100644
>>> --- a/drivers/gpu/drm/drm_syncobj.c
>>> +++ b/drivers/gpu/drm/drm_syncobj.c
>>> @@ -56,6 +56,9 @@
>>>   #include "drm_internal.h"
>>>   #include <drm/drm_syncobj.h>
>>>   +/* merge normal syncobj to timeline syncobj, the point interval 
>>> is 1 */
>>> +#define DRM_SYNCOBJ_NORMAL_POINT 1
>>> +
>>>   struct drm_syncobj_stub_fence {
>>>       struct dma_fence base;
>>>       spinlock_t lock;
>>> @@ -82,6 +85,18 @@ static const struct dma_fence_ops 
>>> drm_syncobj_stub_fence_ops = {
>>>       .release = drm_syncobj_stub_fence_release,
>>>   };
>>>   +struct drm_syncobj_signal_pt {
>>> +    struct dma_fence_array *base;
>>> +    u64    value;
>>> +    struct list_head list;
>>> +};
>>> +struct drm_syncobj_wait_pt {
>>> +    struct drm_syncobj_stub_fence base;
>>> +    struct dma_fence *signal_pt_fence;
>>> +    struct dma_fence_cb wait_cb;
>>> +    struct rb_node   node;
>>> +    u64    value;
>>> +};
>>>     /**
>>>    * drm_syncobj_find - lookup and reference a sync object.
>>> @@ -109,61 +124,238 @@ struct drm_syncobj *drm_syncobj_find(struct 
>>> drm_file *file_private,
>>>   }
>>>   EXPORT_SYMBOL(drm_syncobj_find);
>>>   -static void drm_syncobj_add_callback_locked(struct drm_syncobj 
>>> *syncobj,
>>> -                        struct drm_syncobj_cb *cb,
>>> -                        drm_syncobj_func_t func)
>>> +static void drm_syncobj_timeline_init(struct drm_syncobj *syncobj,
>>> +                      struct drm_syncobj_timeline *syncobj_timeline)
>>
>> Since we merged timeline and singleton syncobj you can drop the extra 
>> _timeline_ part in the function name I think.
Will try in v5.

>>
>>>   {
>>> -    cb->func = func;
>>> -    list_add_tail(&cb->node, &syncobj->cb_list);
>>> +    spin_lock(&syncobj->lock);
>>> +    syncobj_timeline->timeline_context = dma_fence_context_alloc(1);
>>> +    syncobj_timeline->timeline = 0;
>>> +    syncobj_timeline->signal_point = 0;
>>> +    init_waitqueue_head(&syncobj_timeline->wq);
>>> +
>>> +    syncobj_timeline->wait_pt_tree = RB_ROOT;
>>> +    INIT_LIST_HEAD(&syncobj_timeline->signal_pt_list);
>>> +    spin_unlock(&syncobj->lock);
>>>   }
>>>   -static int drm_syncobj_fence_get_or_add_callback(struct 
>>> drm_syncobj *syncobj,
>>> -                         struct dma_fence **fence,
>>> -                         struct drm_syncobj_cb *cb,
>>> -                         drm_syncobj_func_t func)
>>> +static void drm_syncobj_timeline_fini(struct drm_syncobj *syncobj,
>>> +                      struct drm_syncobj_timeline *syncobj_timeline)
>>>   {
>>> -    int ret;
>>> -
>>> -    *fence = drm_syncobj_fence_get(syncobj);
>>> -    if (*fence)
>>> -        return 1;
>>> +    struct rb_node *node = NULL;
>>> +    struct drm_syncobj_wait_pt *wait_pt = NULL;
>>> +    struct drm_syncobj_signal_pt *signal_pt = NULL, *tmp;
>>>         spin_lock(&syncobj->lock);
>>> -    /* We've already tried once to get a fence and failed. Now that we
>>> -     * have the lock, try one more time just to be sure we don't add a
>>> -     * callback when a fence has already been set.
>>> -     */
>>> -    if (syncobj->fence) {
>>> -        *fence = 
>>> dma_fence_get(rcu_dereference_protected(syncobj->fence,
>>> - lockdep_is_held(&syncobj->lock)));
>>> -        ret = 1;
>>> -    } else {
>>> -        *fence = NULL;
>>> -        drm_syncobj_add_callback_locked(syncobj, cb, func);
>>> -        ret = 0;
>>> +    if (!RB_EMPTY_ROOT(&syncobj_timeline->wait_pt_tree))
>>> +        DRM_ERROR("There still are advanced wait_pts! pls check!");
>>> +    while ((node = rb_first(&syncobj_timeline->wait_pt_tree))) {
>>> +        wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>>> +        rb_erase(&wait_pt->node,
>>> +             &syncobj_timeline->wait_pt_tree);
>>> +        RB_CLEAR_NODE(&wait_pt->node);
>>> +        if (!wait_pt->signal_pt_fence) {
>>> +            /* if wait_pt still is advanced, fake signal it.
>>> +             * generally shouldn't happens */
>>> +            dma_fence_set_error(&wait_pt->base.base, -ENOENT);
>>> +            dma_fence_signal(&wait_pt->base.base);
>>> +        }
>>> +        /* kfree(wait_pt) is excuted by fence put */
>>> +        dma_fence_put(&wait_pt->base.base);
>>> +    }
>>> +    list_for_each_entry_safe(signal_pt, tmp,
>>> +                 &syncobj_timeline->signal_pt_list, list) {
>>> +        list_del(&signal_pt->list);
>>> +        dma_fence_put(&signal_pt->base->base);
>>> +        kfree(signal_pt);
>>>       }
>>>       spin_unlock(&syncobj->lock);
>>> +}
>>>   -    return ret;
>>> +static void wait_pt_func(struct dma_fence *fence, struct 
>>> dma_fence_cb *cb)
>>> +{
>>> +    struct drm_syncobj_wait_pt *wait_pt =
>>> +        container_of(cb, struct drm_syncobj_wait_pt, wait_cb);
>>> +
>>> +    dma_fence_signal(&wait_pt->base.base);
>>> +    dma_fence_put(wait_pt->signal_pt_fence);
>>> +    wait_pt->signal_pt_fence = NULL;
>>> +    dma_fence_put(&wait_pt->base.base);
>>> +}
>>> +
>>> +static void drm_syncobj_find_signal_pt_for_wait_pt(struct 
>>> drm_syncobj *syncobj,
>>> +                           struct drm_syncobj_wait_pt *wait_pt)
>>> +{
>>
>> That whole approach still looks horrible complicated to me.
It's already very close to what you said before.

>>
>> Especially the separation of signal and wait pt is completely 
>> unnecessary as far as I can see.
>> When a wait pt is requested we just need to search for the signal 
>> point which it will trigger.
Yeah, I tried this, but when I implement cpu wait ioctl on specific 
point, we need a advanced wait pt fence, otherwise, we could still need 
old syncobj cb.


Thanks,
David Zhou
>>
>> Regards,
>> Christian.
>>
>>> +    struct drm_syncobj_timeline *timeline = 
>>> &syncobj->syncobj_timeline;
>>> +    struct drm_syncobj_signal_pt *signal_pt;
>>> +    int ret;
>>> +
>>> +    if (wait_pt->signal_pt_fence) {
>>> +        return;
>>> +    } else if ((syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) &&
>>> +           (wait_pt->value <= timeline->timeline)) {
>>> +        dma_fence_signal(&wait_pt->base.base);
>>> +        rb_erase(&wait_pt->node,
>>> +             &timeline->wait_pt_tree);
>>> +        RB_CLEAR_NODE(&wait_pt->node);
>>> +        dma_fence_put(&wait_pt->base.base);
>>> +        return;
>>> +    }
>>> +
>>> +    list_for_each_entry(signal_pt, &timeline->signal_pt_list, list) {
>>> +        if (wait_pt->value < signal_pt->value)
>>> +            continue;
>>> +        if ((syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) &&
>>> +            (wait_pt->value != signal_pt->value))
>>> +            continue;
>>> +        wait_pt->signal_pt_fence = 
>>> dma_fence_get(&signal_pt->base->base);
>>> +        ret = dma_fence_add_callback(wait_pt->signal_pt_fence,
>>> +                         &wait_pt->wait_cb,
>>> +                         wait_pt_func);
>>> +        if (ret == -ENOENT) {
>>> +            dma_fence_signal(&wait_pt->base.base);
>>> +            dma_fence_put(wait_pt->signal_pt_fence);
>>> +            wait_pt->signal_pt_fence = NULL;
>>> +            rb_erase(&wait_pt->node,
>>> +                 &timeline->wait_pt_tree);
>>> +            RB_CLEAR_NODE(&wait_pt->node);
>>> +            dma_fence_put(&wait_pt->base.base);
>>> +        } else if (ret < 0) {
>>> +            dma_fence_put(wait_pt->signal_pt_fence);
>>> +            DRM_ERROR("add callback error!");
>>> +        } else {
>>> +            /* after adding callback, remove from rb tree */
>>> +            rb_erase(&wait_pt->node,
>>> +                 &timeline->wait_pt_tree);
>>> +            RB_CLEAR_NODE(&wait_pt->node);
>>> +        }
>>> +        return;
>>> +    }
>>> +    /* signaled pt was released */
>>> +    if (!wait_pt->signal_pt_fence && (wait_pt->value <=
>>> +                      timeline->signal_point)) {
>>> +        dma_fence_signal(&wait_pt->base.base);
>>> +        rb_erase(&wait_pt->node,
>>> +             &timeline->wait_pt_tree);
>>> +        RB_CLEAR_NODE(&wait_pt->node);
>>> +        dma_fence_put(&wait_pt->base.base);
>>> +    }
>>>   }
>>>   -void drm_syncobj_add_callback(struct drm_syncobj *syncobj,
>>> -                  struct drm_syncobj_cb *cb,
>>> -                  drm_syncobj_func_t func)
>>> +static int drm_syncobj_timeline_create_signal_pt(struct drm_syncobj 
>>> *syncobj,
>>> +                         struct dma_fence *fence,
>>> +                         u64 point)
>>>   {
>>> +    struct drm_syncobj_signal_pt *signal_pt =
>>> +        kzalloc(sizeof(struct drm_syncobj_signal_pt), GFP_KERNEL);
>>> +    struct drm_syncobj_signal_pt *tail_pt;
>>> +    struct dma_fence **fences;
>>> +    struct rb_node *node;
>>> +    struct drm_syncobj_wait_pt *tail_wait_pt = NULL;
>>> +    int num_fences = 0;
>>> +    int ret = 0, i;
>>> +
>>> +    if (!signal_pt)
>>> +        return -ENOMEM;
>>> +    if (syncobj->syncobj_timeline.signal_point >= point) {
>>> +        DRM_WARN("A later signal is ready!");
>>> +        goto out;
>>> +    }
>>> +    if (!fence)
>>> +        goto out;
>>> +
>>> +    fences = kmalloc_array(sizeof(void *), 2, GFP_KERNEL);
>>> +    if (!fences)
>>> +        goto out;
>>> +    fences[num_fences++] = dma_fence_get(fence);
>>> +    /* timeline syncobj must take this dependency */
>>> +    if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>> +        spin_lock(&syncobj->lock);
>>> +        if (!list_empty(&syncobj->syncobj_timeline.signal_pt_list)) {
>>> +            tail_pt = 
>>> list_last_entry(&syncobj->syncobj_timeline.signal_pt_list,
>>> +                          struct drm_syncobj_signal_pt, list);
>>> +            fences[num_fences++] = 
>>> dma_fence_get(&tail_pt->base->base);
>>> +        }
>>> +        spin_unlock(&syncobj->lock);
>>> +    }
>>> +    signal_pt->base = dma_fence_array_create(num_fences, fences,
>>> + syncobj->syncobj_timeline.timeline_context,
>>> +                         point, false);
>>> +    if (!signal_pt->base)
>>> +        goto fail;
>>> +
>>> +    signal_pt->value = point;
>>>       spin_lock(&syncobj->lock);
>>> -    drm_syncobj_add_callback_locked(syncobj, cb, func);
>>> +    syncobj->syncobj_timeline.signal_point = point;
>>> +    INIT_LIST_HEAD(&signal_pt->list);
>>> +    list_add_tail(&signal_pt->list, 
>>> &syncobj->syncobj_timeline.signal_pt_list);
>>> +
>>> +    /* check if there is advanced wait */
>>> +    node = rb_last(&syncobj->syncobj_timeline.wait_pt_tree);
>>> +    if (node)
>>> +        tail_wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, 
>>> node);
>>> +    if (tail_wait_pt && !tail_wait_pt->signal_pt_fence) {
>>> +        for (node = rb_first(&syncobj->syncobj_timeline.wait_pt_tree);
>>> +             node != NULL; node = rb_next(node)) {
>>> +            struct drm_syncobj_wait_pt *wait_pt =
>>> +                rb_entry(node, struct drm_syncobj_wait_pt,
>>> +                     node);
>>> +
>>> +            drm_syncobj_find_signal_pt_for_wait_pt(syncobj,
>>> +                                   wait_pt);
>>> +        }
>>> +    }
>>> +
>>>       spin_unlock(&syncobj->lock);
>>> +    wake_up_all(&syncobj->syncobj_timeline.wq);
>>> +
>>> +    return 0;
>>> +fail:
>>> +    for (i = 0; i < num_fences; i++)
>>> +        dma_fence_put(fences[i]);
>>> +    kfree(fences);
>>> +out:
>>> +    kfree(signal_pt);
>>> +    return ret;
>>>   }
>>>   -void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
>>> -                 struct drm_syncobj_cb *cb)
>>> +static void drm_syncobj_timeline_garbage_collection(struct 
>>> drm_syncobj *syncobj)
>>>   {
>>> +    struct drm_syncobj_timeline *timeline = 
>>> &syncobj->syncobj_timeline;
>>> +    struct rb_node *node;
>>> +    struct drm_syncobj_wait_pt *wait_pt;
>>> +    struct drm_syncobj_signal_pt *signal_pt, *tmp;
>>> +
>>>       spin_lock(&syncobj->lock);
>>> -    list_del_init(&cb->node);
>>> +    node = rb_first(&timeline->wait_pt_tree);
>>> +    while (node) {
>>> +        wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>>> +        if (!dma_fence_is_signaled(&wait_pt->base.base)) {
>>> +            node = rb_next(node);
>>> +            continue;
>>> +        }
>>> +        rb_erase(&wait_pt->node,
>>> +             &timeline->wait_pt_tree);
>>> +        RB_CLEAR_NODE(&wait_pt->node);
>>> +        /* kfree(wait_pt) is excuted by fence put */
>>> +        dma_fence_put(&wait_pt->base.base);
>>> +        node = rb_first(&timeline->wait_pt_tree);
>>> +    }
>>> +    list_for_each_entry_safe(signal_pt, tmp,
>>> +                 &timeline->signal_pt_list, list) {
>>> +        if (dma_fence_is_signaled(&signal_pt->base->base)) {
>>> +            timeline->timeline = signal_pt->value;
>>> +            list_del(&signal_pt->list);
>>> +            dma_fence_put(&signal_pt->base->base);
>>> +            kfree(signal_pt);
>>> +        } else {
>>> +            /*signal_pt is in order in list, from small to big, so
>>> +             * the later must not be signal either */
>>> +            break;
>>> +        }
>>> +    }
>>> +
>>>       spin_unlock(&syncobj->lock);
>>>   }
>>> -
>>>   /**
>>>    * drm_syncobj_replace_fence - replace fence in a sync object.
>>>    * @syncobj: Sync object to replace fence in
>>> @@ -176,28 +368,29 @@ void drm_syncobj_replace_fence(struct 
>>> drm_syncobj *syncobj,
>>>                      u64 point,
>>>                      struct dma_fence *fence)
>>>   {
>>> -    struct dma_fence *old_fence;
>>> -    struct drm_syncobj_cb *cur, *tmp;
>>> -
>>> -    if (fence)
>>> -        dma_fence_get(fence);
>>> -
>>> -    spin_lock(&syncobj->lock);
>>> -
>>> -    old_fence = rcu_dereference_protected(syncobj->fence,
>>> - lockdep_is_held(&syncobj->lock));
>>> -    rcu_assign_pointer(syncobj->fence, fence);
>>> -
>>> -    if (fence != old_fence) {
>>> -        list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) {
>>> -            list_del_init(&cur->node);
>>> -            cur->func(syncobj, cur);
>>> +    drm_syncobj_timeline_garbage_collection(syncobj);
>>> +    if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>> +        if (fence)
>>> +            drm_syncobj_timeline_create_signal_pt(syncobj, fence,
>>> +                                  point);
>>> +        return;
>>> +    } else if (syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) {
>>> +        u64 pt_value;
>>> +
>>> +        if (!fence) {
>>> +            drm_syncobj_timeline_fini(syncobj,
>>> +                          &syncobj->syncobj_timeline);
>>> +            drm_syncobj_timeline_init(syncobj,
>>> +                          &syncobj->syncobj_timeline);
>>> +            return;
>>>           }
>>> +        pt_value = syncobj->syncobj_timeline.signal_point +
>>> +            DRM_SYNCOBJ_NORMAL_POINT;
>>> +        drm_syncobj_timeline_create_signal_pt(syncobj, fence, 
>>> pt_value);
>>> +        return;
>>> +    } else {
>>> +        DRM_ERROR("the syncobj type isn't support\n");
>>>       }
>>> -
>>> -    spin_unlock(&syncobj->lock);
>>> -
>>> -    dma_fence_put(old_fence);
>>>   }
>>>   EXPORT_SYMBOL(drm_syncobj_replace_fence);
>>>   @@ -220,6 +413,120 @@ static int 
>>> drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
>>>       return 0;
>>>   }
>>>   +static struct drm_syncobj_wait_pt *
>>> +drm_syncobj_timeline_lookup_wait_pt_fence(struct drm_syncobj *syncobj,
>>> +                      u64 point,
>>> +                      struct dma_fence **fence)
>>> +{
>>> +    struct rb_node *node = 
>>> syncobj->syncobj_timeline.wait_pt_tree.rb_node;
>>> +    struct drm_syncobj_wait_pt *wait_pt = NULL;
>>> +
>>> +    spin_lock(&syncobj->lock);
>>> +    while(node) {
>>> +        int result;
>>> +
>>> +        wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>>> +        result = point - wait_pt->value;
>>> +        if (result < 0) {
>>> +            node = node->rb_left;
>>> +        } else if (result > 0) {
>>> +            node = node->rb_right;
>>> +        } else {
>>> +            if (fence)
>>> +                *fence = dma_fence_get(&wait_pt->base.base);
>>> +            break;
>>> +        }
>>> +    }
>>> +    spin_unlock(&syncobj->lock);
>>> +
>>> +    return wait_pt;
>>> +}
>>> +
>>> +static struct drm_syncobj_wait_pt *
>>> +drm_syncobj_timeline_create_wait_pt_and_return_fence(struct 
>>> drm_syncobj *syncobj,
>>> +                             u64 point,
>>> +                             struct dma_fence **fence)
>>> +{
>>> +    struct drm_syncobj_wait_pt *wait_pt = kzalloc(sizeof(*wait_pt),
>>> +                              GFP_KERNEL);
>>> +    struct drm_syncobj_stub_fence *base;
>>> +    struct rb_node **new = 
>>> &(syncobj->syncobj_timeline.wait_pt_tree.rb_node), *parent = NULL;
>>> +
>>> +    if (!wait_pt)
>>> +        return NULL;
>>> +    base = &wait_pt->base;
>>> +    spin_lock_init(&base->lock);
>>> +    dma_fence_init(&base->base,
>>> +               &drm_syncobj_stub_fence_ops,
>>> +               &base->lock,
>>> +               syncobj->syncobj_timeline.timeline_context, point);
>>> +    wait_pt->value = point;
>>> +    wait_pt->signal_pt_fence = NULL;
>>> +
>>> +    /* wait pt must be in an order, so that we can easily lookup 
>>> and signal
>>> +     * it */
>>> +    spin_lock(&syncobj->lock);
>>> +    while(*new) {
>>> +        struct drm_syncobj_wait_pt *this =
>>> +            rb_entry(*new, struct drm_syncobj_wait_pt, node);
>>> +        int result = wait_pt->value - this->value;
>>> +
>>> +        parent = *new;
>>> +        if (result < 0)
>>> +            new = &((*new)->rb_left);
>>> +        else if (result > 0)
>>> +            new = &((*new)->rb_right);
>>> +        else
>>> +            goto exist;
>>> +    }
>>> +    if (fence)
>>> +        *fence = dma_fence_get(&wait_pt->base.base);
>>> +    rb_link_node(&wait_pt->node, parent, new);
>>> +    rb_insert_color(&wait_pt->node, 
>>> &syncobj->syncobj_timeline.wait_pt_tree);
>>> +    spin_unlock(&syncobj->lock);
>>> +    return wait_pt;
>>> +exist:
>>> +    spin_unlock(&syncobj->lock);
>>> +    dma_fence_put(&wait_pt->base.base);
>>> +    wait_pt = drm_syncobj_timeline_lookup_wait_pt_fence(syncobj, 
>>> point,
>>> +                                fence);
>>> +    return wait_pt;
>>> +}
>>> +
>>> +static struct dma_fence *
>>> +drm_syncobj_timeline_point_get(struct drm_syncobj *syncobj, u64 
>>> point, u64 flags)
>>> +{
>>> +    struct drm_syncobj_wait_pt *wait_pt;
>>> +    struct dma_fence *fence = NULL;
>>> +
>>> +    /* check if the wait pt exists */
>>> +    wait_pt = drm_syncobj_timeline_lookup_wait_pt_fence(syncobj, 
>>> point,
>>> +                                &fence);
>>> +    if (!fence) {
>>> +        /* This is a new wait pt, so create it */
>>> +        wait_pt = 
>>> drm_syncobj_timeline_create_wait_pt_and_return_fence(syncobj, point,
>>> +                                  &fence);
>>> +        if (!fence)
>>> +            return NULL;
>>> +    }
>>> +    if (wait_pt) {
>>> +        int ret = 0;
>>> +
>>> +        if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
>>> +            ret = 
>>> wait_event_interruptible_timeout(syncobj->syncobj_timeline.wq,
>>> +                                   wait_pt->value <= 
>>> syncobj->syncobj_timeline.signal_point,
>>> +                                   msecs_to_jiffies(10000)); /* 
>>> wait 10s */
>>> +            if (ret <= 0)
>>> +                return NULL;
>>> +        }
>>> +        spin_lock(&syncobj->lock);
>>> +        drm_syncobj_find_signal_pt_for_wait_pt(syncobj, wait_pt);
>>> +        spin_unlock(&syncobj->lock);
>>> +        return fence;
>>> +    }
>>> +    return NULL;
>>> +}
>>> +
>>>   /**
>>>    * drm_syncobj_find_fence - lookup and reference the fence in a 
>>> sync object
>>>    * @file_private: drm file private pointer
>>> @@ -234,20 +541,46 @@ static int 
>>> drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
>>>    * contains a reference to the fence, which must be released by 
>>> calling
>>>    * dma_fence_put().
>>>    */
>>> -int drm_syncobj_find_fence(struct drm_file *file_private,
>>> -               u32 handle, u64 point,
>>> -               struct dma_fence **fence)
>>> +int drm_syncobj_search_fence(struct drm_syncobj *syncobj, u64 point,
>>> +                 u64 flags, struct dma_fence **fence)
>>>   {
>>> -    struct drm_syncobj *syncobj = drm_syncobj_find(file_private, 
>>> handle);
>>>       int ret = 0;
>>>         if (!syncobj)
>>>           return -ENOENT;
>>>   -    *fence = drm_syncobj_fence_get(syncobj);
>>> +    drm_syncobj_timeline_garbage_collection(syncobj);
>>> +    if (syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) {
>>> +        /*NORMAL syncobj always wait on last pt */
>>> +        u64 tail_pt_value = syncobj->syncobj_timeline.signal_point;
>>> +
>>> +        if (tail_pt_value == 0)
>>> +            tail_pt_value += DRM_SYNCOBJ_NORMAL_POINT;
>>> +        /* NORMAL syncobj doesn't care point value */
>>> +        WARN_ON(point != 0);
>>> +        *fence = drm_syncobj_timeline_point_get(syncobj, 
>>> tail_pt_value,
>>> +                            flags);
>>> +    } else if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>> +        *fence = drm_syncobj_timeline_point_get(syncobj, point,
>>> +                            flags);
>>> +    } else {
>>> +        DRM_ERROR("Don't support this type syncobj\n");
>>> +        *fence = NULL;
>>> +    }
>>>       if (!*fence) {
>>>           ret = -EINVAL;
>>>       }
>>> +    return ret;
>>> +}
>>> +EXPORT_SYMBOL(drm_syncobj_search_fence);
>>> +int drm_syncobj_find_fence(struct drm_file *file_private,
>>> +               u32 handle, u64 point,
>>> +               struct dma_fence **fence) {
>>> +    struct drm_syncobj *syncobj = drm_syncobj_find(file_private, 
>>> handle);
>>> +
>>> +    int ret = drm_syncobj_search_fence(syncobj, point,
>>> +                    DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT,
>>> +                    fence);
>>>       drm_syncobj_put(syncobj);
>>>       return ret;
>>>   }
>>> @@ -264,7 +597,7 @@ void drm_syncobj_free(struct kref *kref)
>>>       struct drm_syncobj *syncobj = container_of(kref,
>>>                              struct drm_syncobj,
>>>                              refcount);
>>> -    drm_syncobj_replace_fence(syncobj, 0, NULL);
>>> +    drm_syncobj_timeline_fini(syncobj, &syncobj->syncobj_timeline);
>>>       kfree(syncobj);
>>>   }
>>>   EXPORT_SYMBOL(drm_syncobj_free);
>>> @@ -292,8 +625,12 @@ int drm_syncobj_create(struct drm_syncobj 
>>> **out_syncobj, uint32_t flags,
>>>           return -ENOMEM;
>>>         kref_init(&syncobj->refcount);
>>> -    INIT_LIST_HEAD(&syncobj->cb_list);
>>>       spin_lock_init(&syncobj->lock);
>>> +    if (flags & DRM_SYNCOBJ_CREATE_TYPE_TIMELINE)
>>> +        syncobj->type = DRM_SYNCOBJ_TYPE_TIMELINE;
>>> +    else
>>> +        syncobj->type = DRM_SYNCOBJ_TYPE_NORMAL;
>>> +    drm_syncobj_timeline_init(syncobj, &syncobj->syncobj_timeline);
>>>         if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
>>>           ret = drm_syncobj_assign_null_handle(syncobj);
>>> @@ -651,7 +988,6 @@ struct syncobj_wait_entry {
>>>       struct task_struct *task;
>>>       struct dma_fence *fence;
>>>       struct dma_fence_cb fence_cb;
>>> -    struct drm_syncobj_cb syncobj_cb;
>>>   };
>>>     static void syncobj_wait_fence_func(struct dma_fence *fence,
>>> @@ -663,18 +999,6 @@ static void syncobj_wait_fence_func(struct 
>>> dma_fence *fence,
>>>       wake_up_process(wait->task);
>>>   }
>>>   -static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
>>> -                      struct drm_syncobj_cb *cb)
>>> -{
>>> -    struct syncobj_wait_entry *wait =
>>> -        container_of(cb, struct syncobj_wait_entry, syncobj_cb);
>>> -
>>> -    /* This happens inside the syncobj lock */
>>> -    wait->fence = 
>>> dma_fence_get(rcu_dereference_protected(syncobj->fence,
>>> - lockdep_is_held(&syncobj->lock)));
>>> -    wake_up_process(wait->task);
>>> -}
>>> -
>>>   static signed long drm_syncobj_array_wait_timeout(struct 
>>> drm_syncobj **syncobjs,
>>>                             uint32_t count,
>>>                             uint32_t flags,
>>> @@ -698,14 +1022,11 @@ static signed long 
>>> drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
>>>       signaled_count = 0;
>>>       for (i = 0; i < count; ++i) {
>>>           entries[i].task = current;
>>> -        entries[i].fence = drm_syncobj_fence_get(syncobjs[i]);
>>> +        ret = drm_syncobj_search_fence(syncobjs[i], 0, 0,
>>> +                           &entries[i].fence);
>>>           if (!entries[i].fence) {
>>> -            if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
>>> -                continue;
>>> -            } else {
>>> -                ret = -EINVAL;
>>> -                goto cleanup_entries;
>>> -            }
>>> +            ret = -EINVAL;
>>> +            goto cleanup_entries;
>>>           }
>>>             if (dma_fence_is_signaled(entries[i].fence)) {
>>> @@ -733,15 +1054,6 @@ static signed long 
>>> drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
>>>        * fallthough and try a 0 timeout wait!
>>>        */
>>>   -    if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
>>> -        for (i = 0; i < count; ++i) {
>>> - drm_syncobj_fence_get_or_add_callback(syncobjs[i],
>>> -                                  &entries[i].fence,
>>> -                                  &entries[i].syncobj_cb,
>>> -                                  syncobj_wait_syncobj_func);
>>> -        }
>>> -    }
>>> -
>>>       do {
>>>           set_current_state(TASK_INTERRUPTIBLE);
>>>   @@ -789,13 +1101,10 @@ static signed long 
>>> drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
>>>     cleanup_entries:
>>>       for (i = 0; i < count; ++i) {
>>> -        if (entries[i].syncobj_cb.func)
>>> -            drm_syncobj_remove_callback(syncobjs[i],
>>> -                            &entries[i].syncobj_cb);
>>> +        dma_fence_put(entries[i].fence);
>>>           if (entries[i].fence_cb.func)
>>>               dma_fence_remove_callback(entries[i].fence,
>>>                             &entries[i].fence_cb);
>>> -        dma_fence_put(entries[i].fence);
>>>       }
>>>       kfree(entries);
>>>   @@ -970,12 +1279,21 @@ drm_syncobj_reset_ioctl(struct drm_device 
>>> *dev, void *data,
>>>       if (ret < 0)
>>>           return ret;
>>>   -    for (i = 0; i < args->count_handles; i++)
>>> -        drm_syncobj_replace_fence(syncobjs[i], 0, NULL);
>>> -
>>> +    for (i = 0; i < args->count_handles; i++) {
>>> +        if (syncobjs[i]->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>> +            DRM_ERROR("timeline syncobj cannot reset!\n");
>>> +            ret = -EINVAL;
>>> +            goto out;
>>> +        }
>>> +        drm_syncobj_timeline_fini(syncobjs[i],
>>> +                      &syncobjs[i]->syncobj_timeline);
>>> +        drm_syncobj_timeline_init(syncobjs[i],
>>> +                      &syncobjs[i]->syncobj_timeline);
>>> +    }
>>> +out:
>>>       drm_syncobj_array_free(syncobjs, args->count_handles);
>>>   -    return 0;
>>> +    return ret;
>>>   }
>>>     int
>>> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c 
>>> b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>> index 0a8d2d64f380..579e91a5858b 100644
>>> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>> @@ -2137,7 +2137,9 @@ await_fence_array(struct i915_execbuffer *eb,
>>>           if (!(flags & I915_EXEC_FENCE_WAIT))
>>>               continue;
>>>   -        fence = drm_syncobj_fence_get(syncobj);
>>> +        drm_syncobj_search_fence(syncobj, 0,
>>> +                     DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT,
>>> +                     &fence);
>>>           if (!fence)
>>>               return -EINVAL;
>>>   diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
>>> index 425432b85a87..657c97dc25ec 100644
>>> --- a/include/drm/drm_syncobj.h
>>> +++ b/include/drm/drm_syncobj.h
>>> @@ -30,6 +30,25 @@
>>>     struct drm_syncobj_cb;
>>>   +enum drm_syncobj_type {
>>> +    DRM_SYNCOBJ_TYPE_NORMAL,
>>> +    DRM_SYNCOBJ_TYPE_TIMELINE
>>> +};
>>> +
>>> +struct drm_syncobj_timeline {
>>> +    wait_queue_head_t    wq;
>>> +    u64 timeline_context;
>>> +    /**
>>> +     * @timeline: syncobj timeline
>>> +     */
>>> +    u64 timeline;
>>> +    u64 signal_point;
>>> +
>>> +
>>> +    struct rb_root wait_pt_tree;
>>> +    struct list_head signal_pt_list;
>>> +};
>>> +
>>>   /**
>>>    * struct drm_syncobj - sync object.
>>>    *
>>> @@ -41,19 +60,16 @@ struct drm_syncobj {
>>>        */
>>>       struct kref refcount;
>>>       /**
>>> -     * @fence:
>>> -     * NULL or a pointer to the fence bound to this object.
>>> -     *
>>> -     * This field should not be used directly. Use 
>>> drm_syncobj_fence_get()
>>> -     * and drm_syncobj_replace_fence() instead.
>>> +     * @type: indicate syncobj type
>>>        */
>>> -    struct dma_fence __rcu *fence;
>>> +    enum drm_syncobj_type type;
>>>       /**
>>> -     * @cb_list: List of callbacks to call when the &fence gets 
>>> replaced.
>>> +     * @syncobj_timeline: timeline
>>>        */
>>> -    struct list_head cb_list;
>>> +    struct drm_syncobj_timeline syncobj_timeline;
>>> +
>>>       /**
>>> -     * @lock: Protects &cb_list and write-locks &fence.
>>> +     * @lock: Protects timeline list and write-locks &fence.
>>>        */
>>>       spinlock_t lock;
>>>       /**
>>> @@ -62,25 +78,6 @@ struct drm_syncobj {
>>>       struct file *file;
>>>   };
>>>   -typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
>>> -                   struct drm_syncobj_cb *cb);
>>> -
>>> -/**
>>> - * struct drm_syncobj_cb - callback for drm_syncobj_add_callback
>>> - * @node: used by drm_syncob_add_callback to append this struct to
>>> - *      &drm_syncobj.cb_list
>>> - * @func: drm_syncobj_func_t to call
>>> - *
>>> - * This struct will be initialized by drm_syncobj_add_callback, 
>>> additional
>>> - * data can be passed along by embedding drm_syncobj_cb in another 
>>> struct.
>>> - * The callback will get called the next time 
>>> drm_syncobj_replace_fence is
>>> - * called.
>>> - */
>>> -struct drm_syncobj_cb {
>>> -    struct list_head node;
>>> -    drm_syncobj_func_t func;
>>> -};
>>> -
>>>   void drm_syncobj_free(struct kref *kref);
>>>     /**
>>> @@ -106,29 +103,6 @@ drm_syncobj_put(struct drm_syncobj *obj)
>>>       kref_put(&obj->refcount, drm_syncobj_free);
>>>   }
>>>   -/**
>>> - * drm_syncobj_fence_get - get a reference to a fence in a sync object
>>> - * @syncobj: sync object.
>>> - *
>>> - * This acquires additional reference to &drm_syncobj.fence 
>>> contained in @obj,
>>> - * if not NULL. It is illegal to call this without already holding 
>>> a reference.
>>> - * No locks required.
>>> - *
>>> - * Returns:
>>> - * Either the fence of @obj or NULL if there's none.
>>> - */
>>> -static inline struct dma_fence *
>>> -drm_syncobj_fence_get(struct drm_syncobj *syncobj)
>>> -{
>>> -    struct dma_fence *fence;
>>> -
>>> -    rcu_read_lock();
>>> -    fence = dma_fence_get_rcu_safe(&syncobj->fence);
>>> -    rcu_read_unlock();
>>> -
>>> -    return fence;
>>> -}
>>> -
>>>   struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
>>>                        u32 handle);
>>>   void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, u64 
>>> point,
>>> @@ -142,5 +116,7 @@ int drm_syncobj_create(struct drm_syncobj 
>>> **out_syncobj, uint32_t flags,
>>>   int drm_syncobj_get_handle(struct drm_file *file_private,
>>>                  struct drm_syncobj *syncobj, u32 *handle);
>>>   int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd);
>>> +int drm_syncobj_search_fence(struct drm_syncobj *syncobj, u64 point,
>>> +                 u64 flags, struct dma_fence **fence);
>>>     #endif
>>> diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
>>> index 300f336633f2..cebdb2541eb7 100644
>>> --- a/include/uapi/drm/drm.h
>>> +++ b/include/uapi/drm/drm.h
>>> @@ -717,6 +717,7 @@ struct drm_prime_handle {
>>>   struct drm_syncobj_create {
>>>       __u32 handle;
>>>   #define DRM_SYNCOBJ_CREATE_SIGNALED (1 << 0)
>>> +#define DRM_SYNCOBJ_CREATE_TYPE_TIMELINE (1 << 1)
>>>       __u32 flags;
>>>   };
>>
>
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