TODO:
1. CPU query and wait on timeline semaphore.
2. test application (Daniel Vetter)
Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
Cc: Christian Konig <christian.koenig@xxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Daniel Rakos <Daniel.Rakos@xxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
---
drivers/gpu/drm/drm_syncobj.c | 383 +++++++++++++++++++++++++++++++++++++++---
include/drm/drm_syncobj.h | 28 +++
include/uapi/drm/drm.h | 1 +
3 files changed, 389 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 6227df2cc0a4..f738d78edf65 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -56,6 +56,44 @@
#include "drm_internal.h"
#include <drm/drm_syncobj.h>
+struct drm_syncobj_stub_fence {
+ struct dma_fence base;
+ spinlock_t lock;
+};
+
+static const char *drm_syncobj_stub_fence_get_name(struct dma_fence *fence)
+{
+ return "syncobjstub";
+}
+
+static bool drm_syncobj_stub_fence_enable_signaling(struct dma_fence *fence)
+{
+ return !dma_fence_is_signaled(fence);
+}
+
+static const struct dma_fence_ops drm_syncobj_stub_fence_ops = {
+ .get_driver_name = drm_syncobj_stub_fence_get_name,
+ .get_timeline_name = drm_syncobj_stub_fence_get_name,
+ .enable_signaling = drm_syncobj_stub_fence_enable_signaling,
+ .release = NULL,
+};
+
+struct drm_syncobj_wait_pt {
+ struct drm_syncobj_stub_fence base;
+ 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;
+};
+
/**
* drm_syncobj_find - lookup and reference a sync object.
* @file_private: drm file private pointer
@@ -137,6 +175,150 @@ void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
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);
+ /* 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_replace_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);
+ wake_up_all(&syncobj->syncobj_timeline.wq);
+ /**
+ * 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_replace_fence - replace fence in a sync object.
* @syncobj: Sync object to replace fence in
@@ -152,6 +334,11 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
struct dma_fence *old_fence;
struct drm_syncobj_cb *cur, *tmp;
+ if (syncobj->type == DRM_SYNCOBJ_TYPE_TIMELINE) {
+ drm_syncobj_timeline_replace_fence(syncobj, fence,
+ point);
+ return;
+ }
if (fence)
dma_fence_get(fence);
@@ -174,28 +361,6 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
}
EXPORT_SYMBOL(drm_syncobj_replace_fence);
-struct drm_syncobj_stub_fence {
- struct dma_fence base;
- spinlock_t lock;
-};
-
-static const char *drm_syncobj_stub_fence_get_name(struct dma_fence *fence)
-{
- return "syncobjstub";
-}
-
-static bool drm_syncobj_stub_fence_enable_signaling(struct dma_fence *fence)
-{
- return !dma_fence_is_signaled(fence);
-}
-
-static const struct dma_fence_ops drm_syncobj_stub_fence_ops = {
- .get_driver_name = drm_syncobj_stub_fence_get_name,
- .get_timeline_name = drm_syncobj_stub_fence_get_name,
- .enable_signaling = drm_syncobj_stub_fence_enable_signaling,
- .release = NULL,
-};
-
static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
{
struct drm_syncobj_stub_fence *fence;
@@ -215,6 +380,121 @@ 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->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);
+ 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);
+ 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;
+ int ret =
+ wait_event_interruptible_timeout(syncobj->syncobj_timeline.wq,
+ wait_pt->value <= syncobj->syncobj_timeline.signal_point,
+ msecs_to_jiffies(10000)); /* wait 10s */
+
+ if (ret <= 0)
+ 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
@@ -240,7 +520,17 @@ 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) {
+ /* NORMAL syncobj doesn't care point value */
+ WARN_ON(point != 0);
+ *fence = drm_syncobj_fence_get(syncobj);
+ } 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("Don't support this type syncobj\n");
+ *fence = NULL;
+ }
if (!*fence) {
ret = -EINVAL;
}
@@ -249,6 +539,34 @@ 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);
+ /* 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.
@@ -261,10 +579,23 @@ void drm_syncobj_free(struct kref *kref)
struct drm_syncobj,
refcount);
drm_syncobj_replace_fence(syncobj, NULL, 0);
+ 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->timeline = 0;
+ syncobj_timeline->signal_point = 0;
+ init_waitqueue_head(&syncobj_timeline->wq);
+
+ 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
@@ -290,6 +621,12 @@ 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);
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
index 335ec501001a..342b3ced3e56 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.
*
@@ -40,6 +59,15 @@ struct drm_syncobj {
* @refcount: Reference count of this object.
*/
struct kref refcount;
+ /**
+ * @type: indicate syncobj type
+ */
+ enum drm_syncobj_type type;
+ /**
+ * @syncobj_timeline: timeline
+ */
+ struct drm_syncobj_timeline syncobj_timeline;
+
/**
* @fence:
* NULL or a pointer to the fence bound to this object.
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;
};
