[PATCH 2/7] drm: add syncobj timeline support v8
zhoucm1
zhoucm1 at amd.com
Wed Oct 17 09:17:24 UTC 2018
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?
>
> 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?
>
> 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?
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
>>
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