[PATCH] [RFC]drm: add syncobj timeline support v5
Daniel Vetter
daniel at ffwll.ch
Fri Sep 14 18:24:50 UTC 2018
On Fri, Sep 14, 2018 at 6:43 PM, Christian König
<christian.koenig at amd.com> wrote:
> Am 14.09.2018 um 18:10 schrieb Daniel Vetter:
>>
>> On Fri, Sep 14, 2018 at 12:49:45PM +0200, Christian König wrote:
>>>
>>> Am 14.09.2018 um 12:37 schrieb Chunming Zhou:
>>>>
>>>> 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.
>>>>
>>>> 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
>>>>
>>>> normal syncobj is tested by ./deqp-vk -n dEQP-VK*semaphore*
>>>> timeline syncobj is tested by ./amdgpu_test -s 9
>>>>
>>>> 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>
>>>
>>> At least on first glance that looks like it should work, going to do a
>>> detailed review on Monday.
>>
>> Just for my understanding, it's all condensed down to 1 patch now? I kinda
>> didn't follow the detailed discussion last few days at all :-/
>
>
> I've already committed all the cleanup/fix prerequisites to drm-misc-next.
>
> The driver specific implementation needs to come on top and maybe a new CPU
> wait IOCTL.
>
> But essentially this patch is just the core of the kernel implementation.
Ah cool, missed that.
>> Also, is there a testcase, igt highly preferred (because then we'll run it
>> in our intel-gfx CI, and a bunch of people outside of intel have already
>> discovered that and are using it).
>
>
> libdrm patches and I think amdgpu based test cases where already published
> as well.
>
> Not sure about igt testcases.
I guess we can write them when the intel implementation shows up. Just
kinda still hoping that we'd have a more unfified test suite. And not
really well-kept secret: We do have an amdgpu in our CI, in the form
of kbl-g :-) But unfortunately it's not running the full test set for
patches (only for drm-tip). But we could perhaps run more of the
amdgpu tests somehow, if there's serious interest.
Cheers, Daniel
> Christian.
>
>
>>
>> Thanks, Daniel
>>
>>> Christian.
>>>
>>>> ---
>>>> drivers/gpu/drm/drm_syncobj.c | 294
>>>> ++++++++++++++++++---
>>>> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 4 +-
>>>> include/drm/drm_syncobj.h | 62 +++--
>>>> include/uapi/drm/drm.h | 1 +
>>>> 4 files changed, 292 insertions(+), 69 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/drm_syncobj.c
>>>> b/drivers/gpu/drm/drm_syncobj.c
>>>> index e9ce623d049e..e78d076f2703 100644
>>>> --- a/drivers/gpu/drm/drm_syncobj.c
>>>> +++ b/drivers/gpu/drm/drm_syncobj.c
>>>> @@ -56,6 +56,9 @@either
>>>> #include "drm_internal.h"
>>>> #include <drm/drm_syncobj.h>
>>>> +/* merge normal syncobj to timeline syncobj, the point interval is 1 */
>>>> +#define DRM_SYNCOBJ_NORMAL_POINT 1
>>>> +
>>>> struct drm_syncobj_stub_fence {
>>>> struct dma_fence base;
>>>> spinlock_t lock;
>>>> @@ -82,6 +85,11 @@ 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;
>>>> + u64 value;
>>>> + struct list_head list;
>>>> +};
>>>> /**
>>>> * drm_syncobj_find - lookup and reference a sync object.
>>>> @@ -124,7 +132,7 @@ static int
>>>> drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
>>>> {
>>>> int ret;
>>>> - *fence = drm_syncobj_fence_get(syncobj);
>>>> + ret = drm_syncobj_search_fence(syncobj, 0, 0, fence);
>>>> if (*fence)
>>>> return 1;
>>>> @@ -133,10 +141,10 @@ 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 (fence) {
>>>> + drm_syncobj_search_fence(syncobj, 0, 0, fence);
>>>> + if (*fence)
>>>> + ret = 1;
>>>> } else {
>>>> *fence = NULL;
>>>> drm_syncobj_add_callback_locked(syncobj, cb, func);
>>>> @@ -164,6 +172,151 @@ void drm_syncobj_remove_callback(struct
>>>> drm_syncobj *syncobj,
>>>> spin_unlock(&syncobj->lock);
>>>> }
>>>> +static void drm_syncobj_timeline_init(struct drm_syncobj *syncobj,
>>>> + struct drm_syncobj_timeline
>>>> *syncobj_timeline)
>>>> +{
>>>> + spin_lock(&syncobj->lock);
>>>> + syncobj_timeline->timeline_context = dma_fence_context_alloc(1);
>>>> + syncobj_timeline->timeline = 0;
>>>> + syncobj_timeline->signal_point = 0;
>>>> + init_waitqueue_head(&syncobj_timeline->wq);
>>>> +
>>>> + INIT_LIST_HEAD(&syncobj_timeline->signal_pt_list);
>>>> + spin_unlock(&syncobj->lock);
>>>> +}
>>>> +
>>>> +static void drm_syncobj_timeline_fini(struct drm_syncobj *syncobj,
>>>> + struct drm_syncobj_timeline
>>>> *syncobj_timeline)
>>>> +{
>>>> + struct drm_syncobj_signal_pt *signal_pt = NULL, *tmp;
>>>> +
>>>> + spin_lock(&syncobj->lock);
>>>> + list_for_each_entry_safe(signal_pt, tmp,
>>>> + &syncobj_timeline->signal_pt_list,
>>>> list) {
>>>> + list_del(&signal_pt->list);
>>>> + dma_fence_put(&signal_pt->base->base);
>>>> + kfree(signal_pt);
>>>> + }
>>>> + spin_unlock(&syncobj->lock);
>>>> +}
>>>> +
>>>> +static struct dma_fence
>>>> +*drm_syncobj_find_signal_pt_for_point(struct drm_syncobj *syncobj,
>>>> + uint64_t point)
>>>> +{
>>>> + struct drm_syncobj_timeline *timeline =
>>>> &syncobj->syncobj_timeline;
>>>> + struct drm_syncobj_signal_pt *signal_pt;
>>>> +
>>>> + if ((syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) &&
>>>> + (point <= timeline->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->syncobj_timeline.timeline_context,
>>>> + point);
>>>> +
>>>> + dma_fence_signal(&fence->base);
>>>> + return &fence->base;
>>>> + }
>>>> +
>>>> + list_for_each_entry(signal_pt, &timeline->signal_pt_list, list)
>>>> {
>>>> + if (point > signal_pt->value)
>>>> + continue;
>>>> + if ((syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) &&
>>>> + (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 (syncobj->syncobj_timeline.signal_point >= point) {
>>>> + DRM_WARN("A later signal is ready!");
>>>> + goto out;
>>>> + }
>>>> + if (!fence)
>>>> + goto out;
>>>> +
>>>> + fences = kmalloc_array(sizeof(void *), 2, GFP_KERNEL);
>>>> + if (!fences)
>>>> + goto out;
>>>> + fences[num_fences++] = dma_fence_get(fence);
>>>> + /* timeline syncobj must take this dependency */
>>>> + if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>>> + spin_lock(&syncobj->lock);
>>>> + if
>>>> (!list_empty(&syncobj->syncobj_timeline.signal_pt_list)) {
>>>> + tail_pt =
>>>> list_last_entry(&syncobj->syncobj_timeline.signal_pt_list,
>>>> + struct
>>>> drm_syncobj_signal_pt, list);
>>>> + fences[num_fences++] =
>>>> dma_fence_get(&tail_pt->base->base);
>>>> + }
>>>> + spin_unlock(&syncobj->lock);
>>>> + }
>>>> + signal_pt->base = dma_fence_array_create(num_fences, fences,
>>>> +
>>>> syncobj->syncobj_timeline.timeline_context,
>>>> + point, false);
>>>> + if (!signal_pt->base)
>>>> + goto fail;
>>>> +
>>>> + spin_lock(&syncobj->lock);
>>>> + signal_pt->value = point;
>>>> + INIT_LIST_HEAD(&signal_pt->list);
>>>> + list_add_tail(&signal_pt->list,
>>>> &syncobj->syncobj_timeline.signal_pt_list);
>>>> + syncobj->syncobj_timeline.signal_point = point;
>>>> + spin_unlock(&syncobj->lock);
>>>> + wake_up_all(&syncobj->syncobj_timeline.wq);
>>>> +
>>>> + return 0;
>>>> +fail:
>>>> + for (i = 0; i < num_fences; i++)
>>>> + dma_fence_put(fences[i]);
>>>> + kfree(fences);
>>>> +out:
>>>> + kfree(signal_pt);
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static void drm_syncobj_garbage_collection(struct drm_syncobj *syncobj)
>>>> +{
>>>> + struct drm_syncobj_timeline *timeline =
>>>> &syncobj->syncobj_timeline;
>>>> + struct drm_syncobj_signal_pt *signal_pt, *tmp;
>>>> +
>>>> + spin_lock(&syncobj->lock);
>>>> + list_for_each_entry_safe(signal_pt, tmp,
>>>> + &timeline->signal_pt_list, list) {
>>>> + if (dma_fence_is_signaled(&signal_pt->base->base)) {
>>>> + timeline->timeline = signal_pt->value;
>>>> + list_del(&signal_pt->list);
>>>> + dma_fence_put(&signal_pt->base->base);
>>>> + kfree(signal_pt);
>>>> + } else {
>>>> + /*signal_pt is in order in list, from small to
>>>> big, so
>>>> + * the later must not be signal either */
>>>> + break;
>>>> + }
>>>> + }
>>>> +
>>>> + spin_unlock(&syncobj->lock);
>>>> +}
>>>> /**
>>>> * drm_syncobj_replace_fence - replace fence in a sync object.
>>>> * @syncobj: Sync object to replace fence in
>>>> @@ -176,28 +329,37 @@ 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);
>>>> + drm_syncobj_garbage_collection(syncobj);
>>>> + if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>>> + if (fence)
>>>> + drm_syncobj_create_signal_pt(syncobj, fence,
>>>> point);
>>>> + } else if (syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) {
>>>> + u64 pt_value;
>>>> +
>>>> + if (!fence) {
>>>> + drm_syncobj_timeline_fini(syncobj,
>>>> +
>>>> &syncobj->syncobj_timeline);
>>>> + drm_syncobj_timeline_init(syncobj,
>>>> +
>>>> &syncobj->syncobj_timeline);
>>>> + return;
>>>> + }
>>>> + pt_value = syncobj->syncobj_timeline.signal_point +
>>>> + DRM_SYNCOBJ_NORMAL_POINT;
>>>> + drm_syncobj_create_signal_pt(syncobj, fence, pt_value);
>>>> + } else {
>>>> + DRM_ERROR("the syncobj type isn't support\n");
>>>> + return;
>>>> + }
>>>> + 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 +382,25 @@ static int drm_syncobj_assign_null_handle(struct
>>>> drm_syncobj *syncobj)
>>>> return 0;
>>>> }
>>>> +static struct dma_fence *
>>>> +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_timeout(syncobj->syncobj_timeline.wq,
>>>> + point <=
>>>> syncobj->syncobj_timeline.signal_point,
>>>> + msecs_to_jiffies(10000)); /*
>>>> wait 10s */
>>>> + if (ret <= 0)
>>>> + return NULL;
>>>> + }
>>>> + spin_lock(&syncobj->lock);
>>>> + fence = drm_syncobj_find_signal_pt_for_point(syncobj, point);
>>>> + spin_unlock(&syncobj->lock);
>>>> + return fence;
>>>> +}
>>>> +
>>>> /**
>>>> * drm_syncobj_find_fence - lookup and reference the fence in a sync
>>>> object
>>>> * @file_private: drm file private pointer
>>>> @@ -234,20 +415,46 @@ static int drm_syncobj_assign_null_handle(struct
>>>> drm_syncobj *syncobj)
>>>> * contains a reference to the fence, which must be released by
>>>> calling
>>>> * dma_fence_put().
>>>> */
>>>> -int drm_syncobj_find_fence(struct drm_file *file_private,
>>>> - u32 handle, u64 point,
>>>> - struct dma_fence **fence)
>>>> +int drm_syncobj_search_fence(struct drm_syncobj *syncobj, u64 point,
>>>> + u64 flags, struct dma_fence **fence)
>>>> {
>>>> - struct drm_syncobj *syncobj = drm_syncobj_find(file_private,
>>>> handle);
>>>> int ret = 0;
>>>> if (!syncobj)
>>>> return -ENOENT;
>>>> - *fence = drm_syncobj_fence_get(syncobj);
>>>> + drm_syncobj_garbage_collection(syncobj);
>>>> + if (syncobj->type == DRM_SYNCOBJ_TYPE_NORMAL) {
>>>> + /*NORMAL syncobj always wait on last pt */
>>>> + u64 tail_pt_value =
>>>> syncobj->syncobj_timeline.signal_point;
>>>> +
>>>> + if (tail_pt_value == 0)
>>>> + tail_pt_value += DRM_SYNCOBJ_NORMAL_POINT;
>>>> + /* NORMAL syncobj doesn't care point value */
>>>> + WARN_ON(point != 0);
>>>> + *fence = drm_syncobj_point_get(syncobj, tail_pt_value,
>>>> + flags);
>>>> + } else if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>>> + *fence = drm_syncobj_point_get(syncobj, point,
>>>> + flags);
>>>> + } else {
>>>> + DRM_ERROR("Don't support this type syncobj\n");
>>>> + *fence = NULL;
>>>> + }
>>>> if (!*fence) {
>>>> ret = -EINVAL;
>>>> }
>>>> + return ret;
>>>> +}
>>>> +EXPORT_SYMBOL(drm_syncobj_search_fence);
>>>> +int drm_syncobj_find_fence(struct drm_file *file_private,
>>>> + u32 handle, u64 point,
>>>> + struct dma_fence **fence) {
>>>> + struct drm_syncobj *syncobj = drm_syncobj_find(file_private,
>>>> handle);
>>>> +
>>>> + int ret = drm_syncobj_search_fence(syncobj, point,
>>>> +
>>>> DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT,
>>>> + fence);
>>>> drm_syncobj_put(syncobj);
>>>> return ret;
>>>> }
>>>> @@ -264,7 +471,7 @@ void drm_syncobj_free(struct kref *kref)
>>>> struct drm_syncobj *syncobj = container_of(kref,
>>>> struct drm_syncobj,
>>>> refcount);
>>>> - drm_syncobj_replace_fence(syncobj, 0, NULL);
>>>> + drm_syncobj_timeline_fini(syncobj, &syncobj->syncobj_timeline);
>>>> kfree(syncobj);
>>>> }
>>>> EXPORT_SYMBOL(drm_syncobj_free);
>>>> @@ -294,6 +501,11 @@ 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_NORMAL;
>>>> + drm_syncobj_timeline_init(syncobj, &syncobj->syncobj_timeline);
>>>> if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
>>>> ret = drm_syncobj_assign_null_handle(syncobj);
>>>> @@ -576,7 +788,8 @@ 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 +882,8 @@ 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 +910,8 @@ 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 +1183,21 @@ drm_syncobj_reset_ioctl(struct drm_device *dev,
>>>> void *data,
>>>> if (ret < 0)
>>>> return ret;
>>>> - for (i = 0; i < args->count_handles; i++)
>>>> - drm_syncobj_replace_fence(syncobjs[i], 0, NULL);
>>>> -
>>>> + for (i = 0; i < args->count_handles; i++) {
>>>> + if (syncobjs[i]->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
>>>> + DRM_ERROR("timeline syncobj cannot reset!\n");
>>>> + ret = -EINVAL;
>>>> + goto out;
>>>> + }
>>>> + drm_syncobj_timeline_fini(syncobjs[i],
>>>> +
>>>> &syncobjs[i]->syncobj_timeline);
>>>> + drm_syncobj_timeline_init(syncobjs[i],
>>>> +
>>>> &syncobjs[i]->syncobj_timeline);
>>>> + }
>>>> +out:
>>>> drm_syncobj_array_free(syncobjs, args->count_handles);
>>>> - return 0;
>>>> + return ret;
>>>> }
>>>> int
>>>> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>>> b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>>> index 0a8d2d64f380..579e91a5858b 100644
>>>> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>>> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
>>>> @@ -2137,7 +2137,9 @@ await_fence_array(struct i915_execbuffer *eb,
>>>> if (!(flags & I915_EXEC_FENCE_WAIT))
>>>> continue;
>>>> - fence = drm_syncobj_fence_get(syncobj);
>>>> + drm_syncobj_search_fence(syncobj, 0,
>>>> +
>>>> DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT,
>>>> + &fence);
>>>> if (!fence)
>>>> return -EINVAL;
>>>> diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
>>>> index 425432b85a87..9535521e6623 100644
>>>> --- a/include/drm/drm_syncobj.h
>>>> +++ b/include/drm/drm_syncobj.h
>>>> @@ -30,6 +30,25 @@
>>>> struct drm_syncobj_cb;
>>>> +enum drm_syncobj_type {
>>>> + DRM_SYNCOBJ_TYPE_NORMAL,
>>>> + DRM_SYNCOBJ_TYPE_TIMELINE
>>>> +};
>>>> +
>>>> +struct drm_syncobj_timeline {
>>>> + wait_queue_head_t wq;
>>>> + u64 timeline_context;
>>>> + /**
>>>> + * @timeline: syncobj timeline
>>>> + */
>>>> + u64 timeline;
>>>> + u64 signal_point;
>>>> +
>>>> +
>>>> + struct rb_root wait_pt_tree;
>>>> + struct list_head signal_pt_list;
>>>> +};
>>>> +
>>>> /**
>>>> * struct drm_syncobj - sync object.
>>>> *
>>>> @@ -41,19 +60,19 @@ struct drm_syncobj {
>>>> */
>>>> struct kref refcount;
>>>> /**
>>>> - * @fence:
>>>> - * NULL or a pointer to the fence bound to this object.
>>>> - *
>>>> - * This field should not be used directly. Use
>>>> drm_syncobj_fence_get()
>>>> - * and drm_syncobj_replace_fence() instead.
>>>> + * @type: indicate syncobj type
>>>> */
>>>> - struct dma_fence __rcu *fence;
>>>> + enum drm_syncobj_type type;
>>>> /**
>>>> - * @cb_list: List of callbacks to call when the &fence gets
>>>> replaced.
>>>> + * @syncobj_timeline: timeline
>>>> */
>>>> + struct drm_syncobj_timeline syncobj_timeline;
>>>> + /**
>>>> + * @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 +87,7 @@ 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 +125,6 @@ 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 +138,7 @@ 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;
>>>> };
>
>
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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