[PATCH 2/7] drm: add syncobj timeline support v8
Daniel Vetter
daniel at ffwll.ch
Wed Oct 17 10:22:55 UTC 2018
On Wed, Oct 17, 2018 at 11:17 AM zhoucm1 <zhoucm1 at amd.com> wrote:
>
>
>
> On 2018年10月17日 16:09, Daniel Vetter wrote:
> > On Mon, Oct 15, 2018 at 04:55:48PM +0800, Chunming Zhou wrote:
> >> This patch is for VK_KHR_timeline_semaphore extension, semaphore is called syncobj in kernel side:
> >> This extension introduces a new type of syncobj that has an integer payload
> >> identifying a point in a timeline. Such timeline syncobjs support the
> >> following operations:
> >> * CPU query - A host operation that allows querying the payload of the
> >> timeline syncobj.
> >> * CPU wait - A host operation that allows a blocking wait for a
> >> timeline syncobj to reach a specified value.
> >> * Device wait - A device operation that allows waiting for a
> >> timeline syncobj to reach a specified value.
> >> * Device signal - A device operation that allows advancing the
> >> timeline syncobj to a specified value.
> >>
> >> v1:
> >> 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. syncobj 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)
> >> 4. fix timeline path issues.
> >> 5. write a timeline test in libdrm
> >>
> >> v5: (Christian)
> >> 1. semaphore is called syncobj in kernel side.
> >> 2. don't need 'timeline' characters in some function name.
> >> 3. keep syncobj cb.
> >>
> >> v6: (Christian)
> >> 1. merge syncobj_timeline to syncobj structure.
> >> 2. simplify some check sentences.
> >> 3. some misc change.
> >> 4. fix CTS failed issue.
> >>
> >> v7: (Christian)
> >> 1. error handling when creating signal pt.
> >> 2. remove timeline naming in func.
> >> 3. export flags in find_fence.
> >> 4. allow reset timeline.
> >>
> >> v8:
> >> 1. use wait_event_interruptible without timeout
> >> 2. rename _TYPE_INDIVIDUAL to _TYPE_BINARY
> >>
> >> individual syncobj is tested by ./deqp-vk -n dEQP-VK*semaphore*
> >> timeline syncobj is tested by ./amdgpu_test -s 9
> > Can we please have these low-level syncobj tests as part of igt, together
> > with all the other syncobj tests which are there already?
> Good suggestion first, I'm just not familiar with igt( build, run
> cmd...), maybe we can add it later.
>
> > Really doesn't
> > make much sense imo to splits things on the test suite front.
> >> 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>
> >> Reviewed-by: Christian König <christian.koenig at amd.com>
> >> ---
> >> drivers/gpu/drm/drm_syncobj.c | 287 ++++++++++++++++++---
> >> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
> >> include/drm/drm_syncobj.h | 65 ++---
> >> include/uapi/drm/drm.h | 1 +
> >> 4 files changed, 281 insertions(+), 74 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
> >> index f796c9fc3858..67472bd77c83 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_BINARY_POINT 1
> >> +
> >> struct drm_syncobj_stub_fence {
> >> struct dma_fence base;
> >> spinlock_t lock;
> >> @@ -82,6 +85,11 @@ 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;
> > Out of curiosity, why the pointer and not embedding? base is kinda
> > misleading for a pointer.
> Yeah, Christian doesn't like signal_pt lifecycle same as fence, so it's
> a pointer.
> If you don't like 'base' name, I can change it.
>
> >
> >> + u64 value;
> >> + struct list_head list;
> >> +};
> >>
> >> /**
> >> * drm_syncobj_find - lookup and reference a sync object.
> >> @@ -124,8 +132,8 @@ static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
> >> {
> >> int ret;
> >>
> >> - *fence = drm_syncobj_fence_get(syncobj);
> >> - if (*fence)
> >> + ret = drm_syncobj_search_fence(syncobj, 0, 0, fence);
> >> + if (!ret)
> >> return 1;
> >>
> >> spin_lock(&syncobj->lock);
> >> @@ -133,10 +141,12 @@ static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
> >> * 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;
> >> + if (!list_empty(&syncobj->signal_pt_list)) {
> >> + spin_unlock(&syncobj->lock);
> >> + drm_syncobj_search_fence(syncobj, 0, 0, fence);
> >> + if (*fence)
> >> + return 1;
> >> + spin_lock(&syncobj->lock);
> >> } else {
> >> *fence = NULL;
> >> drm_syncobj_add_callback_locked(syncobj, cb, func);
> >> @@ -164,6 +174,159 @@ void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
> >> spin_unlock(&syncobj->lock);
> >> }
> >>
> >> +static void drm_syncobj_init(struct drm_syncobj *syncobj)
> >> +{
> >> + spin_lock(&syncobj->lock);
> >> + syncobj->timeline_context = dma_fence_context_alloc(1);
> >> + syncobj->timeline = 0;
> >> + syncobj->signal_point = 0;
> >> + init_waitqueue_head(&syncobj->wq);
> >> +
> >> + INIT_LIST_HEAD(&syncobj->signal_pt_list);
> >> + spin_unlock(&syncobj->lock);
> >> +}
> >> +
> >> +static void drm_syncobj_fini(struct drm_syncobj *syncobj)
> >> +{
> >> + struct drm_syncobj_signal_pt *signal_pt = NULL, *tmp;
> >> +
> >> + spin_lock(&syncobj->lock);
> >> + list_for_each_entry_safe(signal_pt, tmp,
> >> + &syncobj->signal_pt_list, list) {
> >> + list_del(&signal_pt->list);
> >> + dma_fence_put(&signal_pt->base->base);
> >> + kfree(signal_pt);
> >> + }
> >> + spin_unlock(&syncobj->lock);
> >> +}
> >> +
> >> +static struct dma_fence
> >> +*drm_syncobj_find_signal_pt_for_point(struct drm_syncobj *syncobj,
> >> + uint64_t point)
> >> +{
> >> + struct drm_syncobj_signal_pt *signal_pt;
> >> +
> >> + if ((syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) &&
> >> + (point <= syncobj->timeline)) {
> >> + struct drm_syncobj_stub_fence *fence =
> >> + kzalloc(sizeof(struct drm_syncobj_stub_fence),
> >> + GFP_KERNEL);
> >> +
> >> + if (!fence)
> >> + return NULL;
> >> + spin_lock_init(&fence->lock);
> >> + dma_fence_init(&fence->base,
> >> + &drm_syncobj_stub_fence_ops,
> >> + &fence->lock,
> >> + syncobj->timeline_context,
> >> + point);
> >> +
> >> + dma_fence_signal(&fence->base);
> >> + return &fence->base;
> >> + }
> >> +
> >> + list_for_each_entry(signal_pt, &syncobj->signal_pt_list, list) {
> >> + if (point > signal_pt->value)
> >> + continue;
> >> + if ((syncobj->type == DRM_SYNCOBJ_TYPE_BINARY) &&
> >> + (point != signal_pt->value))
> >> + continue;
> >> + return dma_fence_get(&signal_pt->base->base);
> >> + }
> >> + return NULL;
> >> +}
> >> +
> >> +static int drm_syncobj_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;
> >> + int num_fences = 0;
> >> + int ret = 0, i;
> >> +
> >> + if (!signal_pt)
> >> + return -ENOMEM;
> >> + if (!fence)
> >> + goto out;
> >> +
> >> + fences = kmalloc_array(sizeof(void *), 2, GFP_KERNEL);
> >> + if (!fences) {
> >> + ret = -ENOMEM;
> >> + 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->signal_pt_list)) {
> >> + tail_pt = list_last_entry(&syncobj->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->timeline_context,
> >> + point, false);
> >> + if (!signal_pt->base) {
> >> + ret = -ENOMEM;
> >> + goto fail;
> >> + }
> >> +
> >> + spin_lock(&syncobj->lock);
> >> + if (syncobj->signal_point >= point) {
> >> + DRM_WARN("A later signal is ready!");
> >> + spin_unlock(&syncobj->lock);
> >> + goto exist;
> >> + }
> >> + signal_pt->value = point;
> >> + list_add_tail(&signal_pt->list, &syncobj->signal_pt_list);
> >> + syncobj->signal_point = point;
> >> + spin_unlock(&syncobj->lock);
> >> + wake_up_all(&syncobj->wq);
> >> +
> >> + return 0;
> >> +exist:
> >> + dma_fence_put(&signal_pt->base->base);
> >> +fail:
> >> + for (i = 0; i < num_fences; i++)
> >> + dma_fence_put(fences[i]);
> >> + kfree(fences);
> >> +out:
> >> + kfree(signal_pt);
> >> + return ret;
> >> +}
> >> +
> >> +static void drm_syncobj_garbage_collection(struct drm_syncobj *syncobj)
> >> +{
> >> + struct drm_syncobj_signal_pt *signal_pt, *tmp, *tail_pt;
> >> +
> >> + spin_lock(&syncobj->lock);
> >> + tail_pt = list_last_entry(&syncobj->signal_pt_list,
> >> + struct drm_syncobj_signal_pt,
> >> + list);
> >> + list_for_each_entry_safe(signal_pt, tmp,
> >> + &syncobj->signal_pt_list, list) {
> >> + if (syncobj->type == DRM_SYNCOBJ_TYPE_BINARY &&
> >> + signal_pt == tail_pt)
> >> + continue;
> >> + if (dma_fence_is_signaled(&signal_pt->base->base)) {
> >> + syncobj->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 +339,29 @@ 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);
> >> + u64 pt_value = point;
> >> +
> >> + drm_syncobj_garbage_collection(syncobj);
> >> + if (syncobj->type == DRM_SYNCOBJ_TYPE_BINARY) {
> >> + if (!fence) {
> >> + drm_syncobj_fini(syncobj);
> >> + drm_syncobj_init(syncobj);
> >> + return;
> >> + }
> >> + pt_value = syncobj->signal_point +
> >> + DRM_SYNCOBJ_BINARY_POINT;
> >> + }
> >> + drm_syncobj_create_signal_pt(syncobj, fence, pt_value);
> >> + if (fence) {
> >> + struct drm_syncobj_cb *cur, *tmp;
> >>
> >> - if (fence != old_fence) {
> >> + spin_lock(&syncobj->lock);
> >> list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) {
> >> list_del_init(&cur->node);
> >> cur->func(syncobj, cur);
> >> }
> >> + spin_unlock(&syncobj->lock);
> >> }
> >> -
> >> - spin_unlock(&syncobj->lock);
> >> -
> >> - dma_fence_put(old_fence);
> >> }
> >> EXPORT_SYMBOL(drm_syncobj_replace_fence);
> >>
> >> @@ -220,6 +384,46 @@ static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
> >> return 0;
> >> }
> >>
> >> +static int
> >> +drm_syncobj_point_get(struct drm_syncobj *syncobj, u64 point, u64 flags,
> >> + struct dma_fence **fence)
> >> +{
> >> + int ret = 0;
> >> +
> >> + if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
> >> + ret = wait_event_interruptible(syncobj->wq,
> >> + point <= syncobj->signal_point);
> >> + if (ret < 0)
> >> + return ret;
> >> + }
> >> + spin_lock(&syncobj->lock);
> >> + *fence = drm_syncobj_find_signal_pt_for_point(syncobj, point);
> >> + if (!*fence)
> >> + ret = -EINVAL;
> >> + spin_unlock(&syncobj->lock);
> >> + return ret;
> >> +}
> >> +
> >> +int drm_syncobj_search_fence(struct drm_syncobj *syncobj, u64 point,
> >> + u64 flags, struct dma_fence **fence)
> > Kerneldoc is missing for this one here.
> It's almost same as drm_syncobj_find_fence, is it still necessary?
Even more reasons, if you do a few links between closely related functions :-)
> > I also think improving the overview comment to explain the timeline stuff,
> > e.g. link to the vulkan extension, and some words on how it's supposed to
> > be used (you need a submit thread and block in userspace until all future
> > timeline points have materialized, only then you can submit to the
> > kernel).
> >
> >> +{
> >> + u64 pt_value = point;
> >> +
> >> + if (!syncobj)
> >> + return -ENOENT;
> >> +
> >> + drm_syncobj_garbage_collection(syncobj);
> >> + if (syncobj->type == DRM_SYNCOBJ_TYPE_BINARY) {
> >> + /*BINARY syncobj always wait on last pt */
> >> + pt_value = syncobj->signal_point;
> >> +
> >> + if (pt_value == 0)
> >> + pt_value += DRM_SYNCOBJ_BINARY_POINT;
> >> + }
> >> + return drm_syncobj_point_get(syncobj, pt_value, flags, fence);
> >> +}
> >> +EXPORT_SYMBOL(drm_syncobj_search_fence);
> >> +
> >> /**
> >> * drm_syncobj_find_fence - lookup and reference the fence in a sync object
> >> * @file_private: drm file private pointer
> >> @@ -228,7 +432,7 @@ static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
> >> * @fence: out parameter for the fence
> >> *
> >> * This is just a convenience function that combines drm_syncobj_find() and
> >> - * drm_syncobj_fence_get().
> >> + * drm_syncobj_lookup_fence().
> >> *
> >> * Returns 0 on success or a negative error value on failure. On success @fence
> >> * contains a reference to the fence, which must be released by calling
> >> @@ -239,15 +443,9 @@ int drm_syncobj_find_fence(struct drm_file *file_private,
> >> struct dma_fence **fence)
> >> {
> >> struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
> >> - int ret = 0;
> >> -
> >> - if (!syncobj)
> >> - return -ENOENT;
> >> + int ret;
> >>
> >> - *fence = drm_syncobj_fence_get(syncobj);
> >> - if (!*fence) {
> >> - ret = -EINVAL;
> >> - }
> >> + ret = drm_syncobj_search_fence(syncobj, point, flags, fence);
> >> drm_syncobj_put(syncobj);
> >> return ret;
> >> }
> >> @@ -264,7 +462,7 @@ 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_fini(syncobj);
> >> kfree(syncobj);
> >> }
> >> EXPORT_SYMBOL(drm_syncobj_free);
> >> @@ -294,6 +492,11 @@ 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;
> >> + else
> >> + syncobj->type = DRM_SYNCOBJ_TYPE_BINARY;
> >> + drm_syncobj_init(syncobj);
> >>
> >> if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
> >> ret = drm_syncobj_assign_null_handle(syncobj);
> >> @@ -576,7 +779,8 @@ drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
> >> return -ENODEV;
> >>
> >> /* no valid flags yet */
> >> - if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
> >> + if (args->flags & ~(DRM_SYNCOBJ_CREATE_SIGNALED |
> >> + DRM_SYNCOBJ_CREATE_TYPE_TIMELINE))
> >> return -EINVAL;
> >>
> >> return drm_syncobj_create_as_handle(file_private,
> >> @@ -669,9 +873,8 @@ static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
> >> 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)));
> >> + drm_syncobj_search_fence(syncobj, 0, 0, &wait->fence);
> >> +
> >> wake_up_process(wait->task);
> >> }
> >>
> >> @@ -698,7 +901,8 @@ 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;
> >> @@ -970,12 +1174,13 @@ 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++) {
> >> + drm_syncobj_fini(syncobjs[i]);
> >> + drm_syncobj_init(syncobjs[i]);
> >> + }
> >> 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..8a8d21b24119 100644
> >> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> >> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> >> @@ -2137,7 +2137,7 @@ 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, 0, &fence);
> >> if (!fence)
> >> return -EINVAL;
> >>
> >> diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
> >> index 2eda44def639..85b36d4e53ee 100644
> >> --- a/include/drm/drm_syncobj.h
> >> +++ b/include/drm/drm_syncobj.h
> >> @@ -30,6 +30,11 @@
> >>
> >> struct drm_syncobj_cb;
> >>
> >> +enum drm_syncobj_type {
> >> + DRM_SYNCOBJ_TYPE_BINARY,
> >> + DRM_SYNCOBJ_TYPE_TIMELINE
> >> +};
> >> +
> >> /**
> >> * struct drm_syncobj - sync object.
> >> *
> > The kerneldoc for this also isn't accurate anymore.
> Can kerneldoc be a separate patch?
You already update the kerneldoc, but not completely in this patch.
That doesn't make sense to split up.
> > With the kernel-doc polished:
> >
> > Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> Thanks at least.
>
> >
> > But I think we definitely want a full ack for the uapi from radv/anv guys
> > (plus the userspace for either of those).
> Dave and Bas are right people, right?
For radv yes, for anv we want Jason Ekstrand I think.
-Daniel
>
> Thanks,
> David
> > -Daniel
> >
> >> @@ -41,19 +46,36 @@ 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
> >> + */
> >> + enum drm_syncobj_type type;
> >> + /**
> >> + * @wq: wait signal operation work queue
> >> + */
> >> + wait_queue_head_t wq;
> >> + /**
> >> + * @timeline_context: fence context used by timeline
> >> */
> >> - struct dma_fence __rcu *fence;
> >> + u64 timeline_context;
> >> /**
> >> - * @cb_list: List of callbacks to call when the &fence gets replaced.
> >> + * @timeline: syncobj timeline value, which indicates point is signaled.
> >> */
> >> + u64 timeline;
> >> + /**
> >> + * @signal_point: which indicates the latest signaler point.
> >> + */
> >> + u64 signal_point;
> >> + /**
> >> + * @signal_pt_list: signaler point list.
> >> + */
> >> + struct list_head signal_pt_list;
> >> +
> >> + /**
> >> + * @cb_list: List of callbacks to call when the &fence gets replaced.
> >> + */
> >> struct list_head cb_list;
> >> /**
> >> - * @lock: Protects &cb_list and write-locks &fence.
> >> + * @lock: Protects syncobj list and write-locks &fence.
> >> */
> >> spinlock_t lock;
> >> /**
> >> @@ -68,7 +90,7 @@ typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
> >> /**
> >> * 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
> >> + * &drm_syncobj.cb_list
> >> * @func: drm_syncobj_func_t to call
> >> *
> >> * This struct will be initialized by drm_syncobj_add_callback, additional
> >> @@ -106,29 +128,6 @@ 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 +141,7 @@ 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;
> >> };
> >>
> >> --
> >> 2.17.1
> >>
>
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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