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path: root/drivers/gpu/drm/drm_vblank.c
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Diffstat (limited to 'drivers/gpu/drm/drm_vblank.c')
-rw-r--r--drivers/gpu/drm/drm_vblank.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 27b6db073a5c..13722c373a6a 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -819,6 +819,11 @@ static void send_vblank_event(struct drm_device *dev,
e->event.vbl.tv_sec = tv.tv_sec;
e->event.vbl.tv_usec = tv.tv_nsec / 1000;
break;
+ case DRM_EVENT_CRTC_SEQUENCE:
+ if (seq)
+ e->event.seq.sequence = seq;
+ e->event.seq.time_ns = ktime_to_ns(now);
+ break;
}
trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq);
drm_send_event_locked(dev, &e->base);
@@ -1650,3 +1655,166 @@ bool drm_crtc_handle_vblank(struct drm_crtc *crtc)
return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc));
}
EXPORT_SYMBOL(drm_crtc_handle_vblank);
+
+/*
+ * Get crtc VBLANK count.
+ *
+ * \param dev DRM device
+ * \param data user arguement, pointing to a drm_crtc_get_sequence structure.
+ * \param file_priv drm file private for the user's open file descriptor
+ */
+
+int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_crtc *crtc;
+ struct drm_vblank_crtc *vblank;
+ int pipe;
+ struct drm_crtc_get_sequence *get_seq = data;
+ ktime_t now;
+ bool vblank_enabled;
+ int ret;
+
+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EINVAL;
+
+ if (!dev->irq_enabled)
+ return -EINVAL;
+
+ crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id);
+ if (!crtc)
+ return -ENOENT;
+
+ pipe = drm_crtc_index(crtc);
+
+ vblank = &dev->vblank[pipe];
+ vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled);
+
+ if (!vblank_enabled) {
+ ret = drm_crtc_vblank_get(crtc);
+ if (ret) {
+ DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret);
+ return ret;
+ }
+ }
+ drm_modeset_lock(&crtc->mutex, NULL);
+ if (crtc->state)
+ get_seq->active = crtc->state->enable;
+ else
+ get_seq->active = crtc->enabled;
+ drm_modeset_unlock(&crtc->mutex);
+ get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now);
+ get_seq->sequence_ns = ktime_to_ns(now);
+ if (!vblank_enabled)
+ drm_crtc_vblank_put(crtc);
+ return 0;
+}
+
+/*
+ * Queue a event for VBLANK sequence
+ *
+ * \param dev DRM device
+ * \param data user arguement, pointing to a drm_crtc_queue_sequence structure.
+ * \param file_priv drm file private for the user's open file descriptor
+ */
+
+int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_crtc *crtc;
+ struct drm_vblank_crtc *vblank;
+ int pipe;
+ struct drm_crtc_queue_sequence *queue_seq = data;
+ ktime_t now;
+ struct drm_pending_vblank_event *e;
+ u32 flags;
+ u64 seq;
+ u64 req_seq;
+ int ret;
+ unsigned long spin_flags;
+
+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EINVAL;
+
+ if (!dev->irq_enabled)
+ return -EINVAL;
+
+ crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id);
+ if (!crtc)
+ return -ENOENT;
+
+ flags = queue_seq->flags;
+ /* Check valid flag bits */
+ if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE|
+ DRM_CRTC_SEQUENCE_NEXT_ON_MISS))
+ return -EINVAL;
+
+ pipe = drm_crtc_index(crtc);
+
+ vblank = &dev->vblank[pipe];
+
+ e = kzalloc(sizeof(*e), GFP_KERNEL);
+ if (e == NULL)
+ return -ENOMEM;
+
+ ret = drm_crtc_vblank_get(crtc);
+ if (ret) {
+ DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret);
+ goto err_free;
+ }
+
+ seq = drm_vblank_count_and_time(dev, pipe, &now);
+ req_seq = queue_seq->sequence;
+
+ if (flags & DRM_CRTC_SEQUENCE_RELATIVE)
+ req_seq += seq;
+
+ if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && vblank_passed(seq, req_seq))
+ req_seq = seq + 1;
+
+ e->pipe = pipe;
+ e->event.base.type = DRM_EVENT_CRTC_SEQUENCE;
+ e->event.base.length = sizeof(e->event.seq);
+ e->event.seq.user_data = queue_seq->user_data;
+
+ spin_lock_irqsave(&dev->event_lock, spin_flags);
+
+ /*
+ * drm_crtc_vblank_off() might have been called after we called
+ * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the
+ * vblank disable, so no need for further locking. The reference from
+ * drm_crtc_vblank_get() protects against vblank disable from another source.
+ */
+ if (!READ_ONCE(vblank->enabled)) {
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
+ ret = drm_event_reserve_init_locked(dev, file_priv, &e->base,
+ &e->event.base);
+
+ if (ret)
+ goto err_unlock;
+
+ e->sequence = req_seq;
+
+ if (vblank_passed(seq, req_seq)) {
+ drm_crtc_vblank_put(crtc);
+ send_vblank_event(dev, e, seq, now);
+ queue_seq->sequence = seq;
+ } else {
+ /* drm_handle_vblank_events will call drm_vblank_put */
+ list_add_tail(&e->base.link, &dev->vblank_event_list);
+ queue_seq->sequence = req_seq;
+ }
+
+ spin_unlock_irqrestore(&dev->event_lock, spin_flags);
+ return 0;
+
+err_unlock:
+ spin_unlock_irqrestore(&dev->event_lock, spin_flags);
+ drm_crtc_vblank_put(crtc);
+err_free:
+ kfree(e);
+ return ret;
+}