[PATCH 2/2] [RFC]drm: add syncobj timeline support

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On 2018å¹´08æ??22æ?¥ 17:24, Daniel Vetter wrote:
> On Wed, Aug 22, 2018 at 04:49:28PM +0800, Chunming Zhou wrote:
>> 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
>> following operations:
>>    * Host query - A host operation that allows querying the payload of the
>>      timeline semaphore.
>>    * Host 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.
>>
>> TODO:
>> CPU query and wait on timeline semaphore.
> Another TODO: igt testcase for all the cornercases. We already have
> other syncobj tests in there.
Yes, I'm also trying to find where test should be wrote, Could you give 
a directory?

Thanks,
David Zhou
>
> That would also help with understanding how this is supposed to be used,
> since I'm a bit too dense to immediately get your algorithm by just
> staring at the code.
>
>
>> Change-Id: I9f09aae225e268442c30451badac40406f24262c
>> 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>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c |   7 +-
>>   drivers/gpu/drm/drm_syncobj.c          | 385 ++++++++++++++++++++++++++++++++-
>>   drivers/gpu/drm/v3d/v3d_gem.c          |   4 +-
>>   drivers/gpu/drm/vc4/vc4_gem.c          |   2 +-
>>   include/drm/drm_syncobj.h              |  45 +++-
>>   include/uapi/drm/drm.h                 |   3 +-
>>   6 files changed, 435 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> index d42d1c8f78f6..463cc8960723 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> @@ -1105,7 +1105,7 @@ static int amdgpu_syncobj_lookup_and_add_to_sync(struct amdgpu_cs_parser *p,
>>   {
>>   	int r;
>>   	struct dma_fence *fence;
>> -	r = drm_syncobj_find_fence(p->filp, handle, &fence);
>> +	r = drm_syncobj_find_fence(p->filp, handle, &fence, 0);
>>   	if (r)
>>   		return r;
>>   
>> @@ -1193,8 +1193,9 @@ static void amdgpu_cs_post_dependencies(struct amdgpu_cs_parser *p)
>>   {
>>   	int i;
>>   
>> -	for (i = 0; i < p->num_post_dep_syncobjs; ++i)
>> -		drm_syncobj_replace_fence(p->post_dep_syncobjs[i], p->fence);
>> +	for (i = 0; i < p->num_post_dep_syncobjs; ++i) {
>> +		drm_syncobj_signal_fence(p->post_dep_syncobjs[i], p->fence, 0);
>> +	}
>>   }
>>   
>>   static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
>> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
>> index 70af32d0def1..3709f36c901e 100644
>> --- a/drivers/gpu/drm/drm_syncobj.c
>> +++ b/drivers/gpu/drm/drm_syncobj.c
>> @@ -187,6 +187,191 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
>>   }
>>   EXPORT_SYMBOL(drm_syncobj_replace_fence);
>>   
>> +static void drm_syncobj_timeline_signal_submission_fences(struct drm_syncobj *syncobj)
>> +{
>> +	struct rb_node *node = NULL;
>> +	struct drm_syncobj_wait_pt *wait_pt = NULL;
>> +
>> +	spin_lock(&syncobj->lock);
>> +	for(node = rb_first(&syncobj->syncobj_timeline.wait_pt_tree);
>> +	    node != NULL; node = rb_next(node)) {
>> +	    wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>> +	    if (wait_pt->value <= syncobj->syncobj_timeline.signal_point) {
>> +		    if (wait_pt->submission_fence)
>> +			dma_fence_signal(&wait_pt->submission_fence->base);
>> +	    } else {
>> +		    /* the loop is from left to right, the later entry value is
>> +		     * bigger, so don't need to check any more */
>> +		    break;
>> +	    }
> This seems to reinvet syncobj->cb_list. Since this is the exact same
> "future fence that doesn't even exist yet" problem I think those two code
> path should be unified. In general I think it'd be much better if we treat
> the old syncobj as a timeline with a limit of 1 slot only.
>
> Or there needs to be a really good reason why all new code.
>
> Specifically for this stuff here having unified future fence semantics
> will allow drivers to do clever stuff with them.
>
>> +	}
>> +	spin_unlock(&syncobj->lock);
>> +}
>> +
>> +static void drm_syncobj_timeline_signal_wait_pts(struct drm_syncobj *syncobj)
>> +{
>> +	struct rb_node *node = NULL;
>> +	struct drm_syncobj_wait_pt *wait_pt = NULL;
>> +
>> +	spin_lock(&syncobj->lock);
>> +	for(node = rb_first(&syncobj->syncobj_timeline.wait_pt_tree);
>> +	    node != NULL; ) {
>> +		wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>> +		node = rb_next(node);
>> +		if (wait_pt->value <= syncobj->syncobj_timeline.timeline) {
>> +			dma_fence_signal(&wait_pt->base.base);
>> +			rb_erase(&wait_pt->node,
>> +				 &syncobj->syncobj_timeline.wait_pt_tree);
>> +			RB_CLEAR_NODE(&wait_pt->node);
>> +			if (wait_pt->submission_fence)
>> +				dma_fence_put(&wait_pt->submission_fence->base);
>> +			/* kfree(wait_pt) is excuted by fence put */
>> +			dma_fence_put(&wait_pt->base.base);
>> +		} else {
>> +			/* the loop is from left to right, the later entry value is
>> +			 * bigger, so don't need to check any more */
>> +			break;
>> +		}
>> +	}
>> +	spin_unlock(&syncobj->lock);
>> +}
>> +
>> +
>> +static void pt_fence_cb(struct drm_syncobj_signal_pt *signal_pt)
>> +{
>> +	struct dma_fence *fence = NULL;
>> +	struct drm_syncobj *syncobj;
>> +
>> +	fence = signal_pt->signal_fence;
>> +	signal_pt->signal_fence = NULL;
>> +	dma_fence_put(fence);
>> +	fence = signal_pt->pre_pt_base;
>> +	signal_pt->pre_pt_base = NULL;
>> +	dma_fence_put(fence);
>> +
>> +	syncobj = signal_pt->syncobj;
>> +	spin_lock(&syncobj->lock);
>> +	list_del(&signal_pt->list);
>> +	syncobj->syncobj_timeline.timeline = signal_pt->value;
>> +	spin_unlock(&syncobj->lock);
>> +	/* kfree(signal_pt) will be  executed by below fence put */
>> +	dma_fence_put(&signal_pt->base.base);
>> +	drm_syncobj_timeline_signal_wait_pts(syncobj);
>> +}
>> +static void pt_signal_fence_func(struct dma_fence *fence,
>> +				 struct dma_fence_cb *cb)
>> +{
>> +	struct drm_syncobj_signal_pt *signal_pt =
>> +		container_of(cb, struct drm_syncobj_signal_pt, signal_cb);
>> +
>> +	if (signal_pt->pre_pt_base &&
>> +	    !dma_fence_is_signaled(signal_pt->pre_pt_base))
>> +		return;
>> +
>> +	pt_fence_cb(signal_pt);
>> +}
>> +static void pt_pre_fence_func(struct dma_fence *fence,
>> +				 struct dma_fence_cb *cb)
>> +{
>> +	struct drm_syncobj_signal_pt *signal_pt =
>> +		container_of(cb, struct drm_syncobj_signal_pt, pre_pt_cb);
>> +
>> +	if (signal_pt->signal_fence &&
>> +	    !dma_fence_is_signaled(signal_pt->pre_pt_base))
>> +		return;
>> +
>> +	pt_fence_cb(signal_pt);
>> +}
>> +
>> +static int drm_syncobj_timeline_signal_fence(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 *tail_pt_fence = NULL;
>> +	int ret = 0;
>> +
>> +	if (!signal_pt)
>> +		return -ENOMEM;
>> +	if (syncobj->syncobj_timeline.signal_point >= point) {
>> +		DRM_WARN("A later signal is ready!");
>> +		goto out;
>> +	}
>> +	if (fence)
>> +		dma_fence_get(fence);
>> +	spin_lock(&syncobj->lock);
>> +	spin_lock_init(&signal_pt->base.lock);
>> +	dma_fence_init(&signal_pt->base.base,
>> +		       &drm_syncobj_stub_fence_ops,
>> +		       &signal_pt->base.lock,
>> +		       syncobj->syncobj_timeline.timeline_context, point);
>> +	signal_pt->signal_fence =
>> +		rcu_dereference_protected(fence,
>> +					  lockdep_is_held(&fence->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);
>> +		tail_pt_fence = &tail_pt->base.base;
>> +		if (dma_fence_is_signaled(tail_pt_fence))
>> +			tail_pt_fence = NULL;
>> +	}
>> +	if (tail_pt_fence)
>> +		signal_pt->pre_pt_base =
>> +			dma_fence_get(rcu_dereference_protected(tail_pt_fence,
>> +								lockdep_is_held(&tail_pt_fence->lock)));
>> +
>> +	signal_pt->value = point;
>> +	syncobj->syncobj_timeline.signal_point = point;
>> +	signal_pt->syncobj = syncobj;
>> +	INIT_LIST_HEAD(&signal_pt->list);
>> +	list_add_tail(&signal_pt->list, &syncobj->syncobj_timeline.signal_pt_list);
>> +	spin_unlock(&syncobj->lock);
>> +	drm_syncobj_timeline_signal_submission_fences(syncobj);
>> +	/**
>> +	 * Every pt is depending on signal fence and previous pt fence, add
>> +	 * callbacks to them
>> +	 */
>> +	if (!dma_fence_is_signaled(signal_pt->signal_fence))
>> +		dma_fence_add_callback(signal_pt->signal_fence,
>> +				       &signal_pt->signal_cb,
>> +				       pt_signal_fence_func);
>> +	else
>> +		pt_signal_fence_func(signal_pt->signal_fence,
>> +				     &signal_pt->signal_cb);
>> +	if (signal_pt->pre_pt_base && !dma_fence_is_signaled(signal_pt->pre_pt_base))
>> +		dma_fence_add_callback(signal_pt->pre_pt_base,
>> +				       &signal_pt->pre_pt_cb,
>> +				       pt_pre_fence_func);
>> +	else
>> +		pt_pre_fence_func(signal_pt->pre_pt_base, &signal_pt->pre_pt_cb);
>> +
>> +
>> +	return 0;
>> +out:
>> +	kfree(signal_pt);
>> +	return ret;
>> +}
>> +
>> +/**
>> + * drm_syncobj_signal_fence - place fence into a sync object.
>> + * @syncobj: Sync object to replace fence in
>> + * @fence: fence to install in sync file.
>> + *
>> + * This places the fence into normal or timeline sync object
>> + */
>> +void drm_syncobj_signal_fence(struct drm_syncobj *syncobj,
>> +			      struct dma_fence *fence,
>> +			      u64 point)
> This is a very confusion function name. Feels like
> drm_syncobj_timeline_signal_fence is rather misnamed. I think we should
> just extend replace_fence like you do with find_fence already.
>
>> +{
>> +	if (syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL)
>> +		drm_syncobj_replace_fence(syncobj, fence);
>> +	else if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE)
>> +		drm_syncobj_timeline_signal_fence(syncobj, fence, point);
>> +}
>> +EXPORT_SYMBOL(drm_syncobj_signal_fence);
>> +
>>   static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
>>   {
>>   	struct drm_syncobj_stub_fence *fence;
>> @@ -205,12 +390,150 @@ 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(struct drm_syncobj *syncobj, u64 point)
>> +{
>> +    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 = point - wait_pt->value;
>> +
>> +	    wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>> +	    if (result < 0)
>> +		    node = node->rb_left;
>> +	    else if (result > 0)
>> +		    node = node->rb_right;
>> +	    else
>> +		    break;
>> +    }
>> +    spin_unlock(&syncobj->lock);
>> +
>> +    return wait_pt;
>> +}
>> +
>> +static struct drm_syncobj_wait_pt *
>> +drm_syncobj_timeline_create_wait_pt(struct drm_syncobj *syncobj, u64 point)
>> +{
>> +	struct drm_syncobj_wait_pt *wait_pt;
>> +	struct rb_node **new = &(syncobj->syncobj_timeline.wait_pt_tree.rb_node), *parent = NULL;
>> +
>> +	wait_pt = kzalloc(sizeof(*wait_pt), GFP_KERNEL);
>> +	if (!wait_pt)
>> +		return NULL;
>> +	spin_lock_init(&wait_pt->base.lock);
>> +	dma_fence_init(&wait_pt->base.base,
>> +		       &drm_syncobj_stub_fence_ops,
>> +		       &wait_pt->base.lock,
>> +		       syncobj->syncobj_timeline.timeline_context, point);
>> +	wait_pt->submission_fence = NULL;
>> +	/* check if the pt is already sumbitted, if yes, then don't need to
>> +	 * create submission fence, otherwise create it */
>> +	if (point > syncobj->syncobj_timeline.signal_point) {
>> +		wait_pt->submission_fence =
>> +			kzalloc(sizeof(struct drm_syncobj_stub_fence),
>> +				GFP_KERNEL);
>> +		if (!wait_pt->submission_fence) {
>> +			dma_fence_put(&wait_pt->base.base);
>> +			return NULL;
>> +		}
>> +		spin_lock_init(&wait_pt->submission_fence->lock);
>> +		dma_fence_init(&wait_pt->submission_fence->base,
>> +			       &drm_syncobj_stub_fence_ops,
>> +			       &wait_pt->submission_fence->lock,
>> +			       syncobj->syncobj_timeline.submission_context,
>> +			       point);
>> +	}
>> +	wait_pt->value = point;
>> +
>> +	/* wait pt must be in an order, so that we can easily lookup and signal
>> +	 * it */
>> +	spin_lock(&syncobj->lock);
>> +	if (point <= syncobj->syncobj_timeline.timeline)
>> +		dma_fence_signal(&wait_pt->base.base);
>> +	if (wait_pt->submission_fence &&
>> +	    point <= syncobj->syncobj_timeline.signal_point)
>> +		dma_fence_signal(&wait_pt->submission_fence->base);
>> +	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;
>> +	}
>> +
>> +	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);
>> +	if (wait_pt->submission_fence)
>> +		dma_fence_put(&wait_pt->submission_fence->base);
>> +	dma_fence_put(&wait_pt->base.base);
>> +	wait_pt = drm_syncobj_timeline_lookup_wait_pt(syncobj, point);
>> +	return wait_pt;
>> +}
>> +
>> +static struct dma_fence *
>> +drm_syncobj_timeline_point_get(struct drm_syncobj *syncobj, u64 point, u64 flag)
>> +{
>> +	struct drm_syncobj_wait_pt *wait_pt;
>> +
>> +	/* already signaled, simply return a signaled stub fence */
>> +	if (point <= syncobj->syncobj_timeline.timeline) {
>> +		struct drm_syncobj_stub_fence *fence;
>> +
>> +		fence = kzalloc(sizeof(*fence), GFP_KERNEL);
>> +		if (fence == NULL)
>> +			return NULL;
>> +
>> +		spin_lock_init(&fence->lock);
>> +		dma_fence_init(&fence->base, &drm_syncobj_stub_fence_ops,
>> +			       &fence->lock, 0, 0);
>> +		dma_fence_signal(&fence->base);
>> +		return &fence->base;
>> +	}
>> +
>> +	/* check if the wait pt exists */
>> +	wait_pt = drm_syncobj_timeline_lookup_wait_pt(syncobj, point);
>> +	if (!wait_pt) {
>> +		/* This is a new wait pt, so create it */
>> +		wait_pt = drm_syncobj_timeline_create_wait_pt(syncobj, point);
>> +		if (!wait_pt)
>> +			return NULL;
>> +	}
>> +	if (wait_pt) {
>> +		struct dma_fence *fence;
>> +		if (wait_pt->submission_fence) {
>> +			if (flag & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT)
>> +				dma_fence_wait(&wait_pt->submission_fence->base, true);
>> +			else if (!dma_fence_is_signaled(&wait_pt->submission_fence->base))
>> +				return NULL;
>> +		}
>> +		rcu_read_lock();
>> +		fence = dma_fence_get_rcu(&wait_pt->base.base);
>> +		rcu_read_unlock();
>> +		return fence;
>> +	}
>> +	return NULL;
>> +}
>> +
>>   
>>   /**
>>    * drm_syncobj_find_fence - lookup and reference the fence in a sync object
>>    * @file_private: drm file private pointer
>>    * @handle: sync object handle to lookup.
>>    * @fence: out parameter for the fence
>> + * @point: timeline point
>>    *
>>    * This is just a convenience function that combines drm_syncobj_find() and
>>    * drm_syncobj_fence_get().
>> @@ -221,7 +544,8 @@ static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
>>    */
>>   int drm_syncobj_find_fence(struct drm_file *file_private,
>>   			   u32 handle,
>> -			   struct dma_fence **fence)
>> +			   struct dma_fence **fence,
>> +			   u64 point)
>>   {
>>   	struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
>>   	int ret = 0;
>> @@ -229,7 +553,15 @@ int drm_syncobj_find_fence(struct drm_file *file_private,
>>   	if (!syncobj)
>>   		return -ENOENT;
>>   
>> -	*fence = drm_syncobj_fence_get(syncobj);
>> +	if (syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) {
>> +		*fence = drm_syncobj_fence_get(syncobj);
> Needs at least a WARN_ON(point != 0) here, since I'd say that would be a
> driver bug. Or userspace bug, in which case we need to return -EINVAL;
>
> Hard to tell without the driver implementation.
>
>> +	}else if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>> +		*fence = drm_syncobj_timeline_point_get(syncobj, point,
>> +							DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT);
>> +	} else {
>> +		DRM_ERROR("invalid syncobj type\n");
>> +		return -EINVAL;
>> +	}
>>   	if (!*fence) {
>>   		ret = -EINVAL;
>>   	}
>> @@ -238,6 +570,35 @@ int drm_syncobj_find_fence(struct drm_file *file_private,
>>   }
>>   EXPORT_SYMBOL(drm_syncobj_find_fence);
>>   
>> +static void drm_syncobj_timeline_fini(struct drm_syncobj *syncobj,
>> +				      struct drm_syncobj_timeline *syncobj_timeline)
>> +{
>> +	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);
>> +	for(node = rb_first(&syncobj_timeline->wait_pt_tree);
>> +	    node != NULL; ) {
>> +		wait_pt = rb_entry(node, struct drm_syncobj_wait_pt, node);
>> +		node = rb_next(node);
>> +		rb_erase(&wait_pt->node,
>> +			 &syncobj_timeline->wait_pt_tree);
>> +		RB_CLEAR_NODE(&wait_pt->node);
>> +		if (wait_pt->submission_fence)
>> +			dma_fence_put(&wait_pt->submission_fence->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->signal_fence);
>> +		dma_fence_put(signal_pt->pre_pt_base);
>> +		dma_fence_put(&signal_pt->base.base);
>> +	}
>> +	spin_unlock(&syncobj->lock);
>> +}
>>   /**
>>    * drm_syncobj_free - free a sync object.
>>    * @kref: kref to free.
>> @@ -250,10 +611,22 @@ void drm_syncobj_free(struct kref *kref)
>>   						   struct drm_syncobj,
>>   						   refcount);
>>   	drm_syncobj_replace_fence(syncobj, NULL);
>> +	drm_syncobj_timeline_fini(syncobj, &syncobj->syncobj_timeline);
>>   	kfree(syncobj);
>>   }
>>   EXPORT_SYMBOL(drm_syncobj_free);
>>   
>> +static void drm_syncobj_timeline_init(struct drm_syncobj_timeline
>> +				      *syncobj_timeline)
>> +{
>> +	syncobj_timeline->timeline_context = dma_fence_context_alloc(1);
>> +	syncobj_timeline->submission_context = dma_fence_context_alloc(1);
>> +	syncobj_timeline->timeline = 0;
>> +	syncobj_timeline->signal_point = 0;
>> +
>> +	syncobj_timeline->wait_pt_tree = RB_ROOT;
>> +	INIT_LIST_HEAD(&syncobj_timeline->signal_pt_list);
>> +}
>>   /**
>>    * drm_syncobj_create - create a new syncobj
>>    * @out_syncobj: returned syncobj
>> @@ -279,6 +652,12 @@ int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
>>   	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;
>> +		drm_syncobj_timeline_init(&syncobj->syncobj_timeline);
>> +	} else {
>> +		syncobj->type = DRM_SYNCOBJ_TYPE_NORMAL;
>> +	}
>>   
>>   	if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
>>   		ret = drm_syncobj_assign_null_handle(syncobj);
>> @@ -491,7 +870,7 @@ static int drm_syncobj_export_sync_file(struct drm_file *file_private,
>>   	if (fd < 0)
>>   		return fd;
>>   
>> -	ret = drm_syncobj_find_fence(file_private, handle, &fence);
>> +	ret = drm_syncobj_find_fence(file_private, handle, &fence, 0);
>>   	if (ret)
>>   		goto err_put_fd;
>>   
>> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
>> index 9029590267aa..f24c3eccb4d5 100644
>> --- a/drivers/gpu/drm/v3d/v3d_gem.c
>> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
>> @@ -521,12 +521,12 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
>>   	kref_init(&exec->refcount);
>>   
>>   	ret = drm_syncobj_find_fence(file_priv, args->in_sync_bcl,
>> -				     &exec->bin.in_fence);
>> +				     &exec->bin.in_fence, 0);
>>   	if (ret == -EINVAL)
>>   		goto fail;
>>   
>>   	ret = drm_syncobj_find_fence(file_priv, args->in_sync_rcl,
>> -				     &exec->render.in_fence);
>> +				     &exec->render.in_fence, 0);
>>   	if (ret == -EINVAL)
>>   		goto fail;
>>   
>> diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
>> index 7910b9acedd6..f7b4971342e8 100644
>> --- a/drivers/gpu/drm/vc4/vc4_gem.c
>> +++ b/drivers/gpu/drm/vc4/vc4_gem.c
>> @@ -1173,7 +1173,7 @@ vc4_submit_cl_ioctl(struct drm_device *dev, void *data,
>>   
>>   	if (args->in_sync) {
>>   		ret = drm_syncobj_find_fence(file_priv, args->in_sync,
>> -					     &in_fence);
>> +					     &in_fence, 0);
>>   		if (ret)
>>   			goto fail;
>>   
>> diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
>> index b04c492ddbb5..b6e193c6cc9a 100644
>> --- a/include/drm/drm_syncobj.h
>> +++ b/include/drm/drm_syncobj.h
>> @@ -54,6 +54,41 @@ const struct dma_fence_ops drm_syncobj_stub_fence_ops = {
>>   	.release = NULL,
>>   };
>>   
>> +enum drm_syncobj_type {
>> +	DRM_SYNCOBJ_TYPE_NORMAL,
>> +	DRM_SYNCOBJ_TYPE_TIMELINE
>> +};
>> +
>> +struct drm_syncobj;
>> +struct drm_syncobj_wait_pt {
>> +	struct drm_syncobj_stub_fence base;
>> +	struct drm_syncobj_stub_fence *submission_fence;
>> +	u64    value;
>> +	struct rb_node   node;
>> +};
>> +struct drm_syncobj_signal_pt {
>> +	struct drm_syncobj_stub_fence base;
>> +	struct dma_fence *signal_fence;
>> +	struct dma_fence *pre_pt_base;
>> +	struct dma_fence_cb signal_cb;
>> +	struct dma_fence_cb pre_pt_cb;
>> +	struct drm_syncobj *syncobj;
>> +	u64    value;
>> +	struct list_head list;
>> +};
> The above internal structs shouldn't be in the public header.
>
> Some tiny comments about what each piece is for would also go a long way
> towards me being able to understand things.
>
> Thanks, Daniel
>
>> +struct drm_syncobj_timeline {
>> +	u64 timeline_context;
>> +	u64 submission_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.
>>    *
>> @@ -64,6 +99,11 @@ struct drm_syncobj {
>>   	 * @refcount: Reference count of this object.
>>   	 */
>>   	struct kref refcount;
>> +	/**
>> +	 * @type: indicate syncobj type
>> +	 */
>> +	enum drm_syncobj_type type;
>> +	struct drm_syncobj_timeline syncobj_timeline;
>>   	/**
>>   	 * @fence:
>>   	 * NULL or a pointer to the fence bound to this object.
>> @@ -162,9 +202,12 @@ void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
>>   				 struct drm_syncobj_cb *cb);
>>   void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
>>   			       struct dma_fence *fence);
>> +void drm_syncobj_signal_fence(struct drm_syncobj *syncobj,
>> +			      struct dma_fence *fence,
>> +			      u64 point);
>>   int drm_syncobj_find_fence(struct drm_file *file_private,
>>   			   u32 handle,
>> -			   struct dma_fence **fence);
>> +			   struct dma_fence **fence, u64 point);
>>   void drm_syncobj_free(struct kref *kref);
>>   int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
>>   		       struct dma_fence *fence);
>> diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
>> index 300f336633f2..71e6cd1c88f8 100644
>> --- a/include/uapi/drm/drm.h
>> +++ b/include/uapi/drm/drm.h
>> @@ -717,6 +717,8 @@ struct drm_prime_handle {
>>   struct drm_syncobj_create {
>>   	__u32 handle;
>>   #define DRM_SYNCOBJ_CREATE_SIGNALED (1 << 0)
>> +#define DRM_SYNCOBJ_CREATE_TYPE_NORMAL (1 << 1)
>> +#define DRM_SYNCOBJ_CREATE_TYPE_TIMELINE (1 << 2)
>>   	__u32 flags;
>>   };
>>   
>> @@ -734,7 +736,6 @@ struct drm_syncobj_handle {
>>   	__s32 fd;
>>   	__u32 pad;
>>   };
>> -
>>   #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL (1 << 0)
>>   #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT (1 << 1)
>>   struct drm_syncobj_wait {
>> -- 
>> 2.14.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel



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