[PATCH 2/2] [RFC]drm: add syncobj timeline support
Daniel Vetter
daniel at ffwll.ch
Wed Aug 22 09:31:16 UTC 2018
On Wed, Aug 22, 2018 at 05:28:17PM +0800, zhoucm1 wrote:
>
>
> On 2018年08月22日 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?
There's already tests/syncobj_basic.c and tests/syncobj_wait.c. Either
extend those, or probably better to start a new tests/syncobj_timeline.c
since I expect this will have a lot of corner-cases we need to check.
-Daniel
>
> 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
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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