1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
new file mode 100644
index 00000000000..0cff7eb3690
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -0,0 +1,262 @@
+/*
+ * Copyright (C) 2007 Ben Skeggs.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+
+#include "nouveau_drv.h"
+#include "nouveau_dma.h"
+
+#define USE_REFCNT (dev_priv->card_type >= NV_10)
+
+struct nouveau_fence {
+	struct nouveau_channel *channel;
+	struct kref refcount;
+	struct list_head entry;
+
+	uint32_t sequence;
+	bool signalled;
+};
+
+static inline struct nouveau_fence *
+nouveau_fence(void *sync_obj)
+{
+	return (struct nouveau_fence *)sync_obj;
+}
+
+static void
+nouveau_fence_del(struct kref *ref)
+{
+	struct nouveau_fence *fence =
+		container_of(ref, struct nouveau_fence, refcount);
+
+	kfree(fence);
+}
+
+void
+nouveau_fence_update(struct nouveau_channel *chan)
+{
+	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
+	struct list_head *entry, *tmp;
+	struct nouveau_fence *fence;
+	uint32_t sequence;
+
+	if (USE_REFCNT)
+		sequence = nvchan_rd32(chan, 0x48);
+	else
+		sequence = chan->fence.last_sequence_irq;
+
+	if (chan->fence.sequence_ack == sequence)
+		return;
+	chan->fence.sequence_ack = sequence;
+
+	list_for_each_safe(entry, tmp, &chan->fence.pending) {
+		fence = list_entry(entry, struct nouveau_fence, entry);
+
+		sequence = fence->sequence;
+		fence->signalled = true;
+		list_del(&fence->entry);
+		kref_put(&fence->refcount, nouveau_fence_del);
+
+		if (sequence == chan->fence.sequence_ack)
+			break;
+	}
+}
+
+int
+nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
+		  bool emit)
+{
+	struct nouveau_fence *fence;
+	int ret = 0;
+
+	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
+	if (!fence)
+		return -ENOMEM;
+	kref_init(&fence->refcount);
+	fence->channel = chan;
+
+	if (emit)
+		ret = nouveau_fence_emit(fence);
+
+	if (ret)
+		nouveau_fence_unref((void *)&fence);
+	*pfence = fence;
+	return ret;
+}
+
+struct nouveau_channel *
+nouveau_fence_channel(struct nouveau_fence *fence)
+{
+	return fence ? fence->channel : NULL;
+}
+
+int
+nouveau_fence_emit(struct nouveau_fence *fence)
+{
+	struct drm_nouveau_private *dev_priv = fence->channel->dev->dev_private;
+	struct nouveau_channel *chan = fence->channel;
+	unsigned long flags;
+	int ret;
+
+	ret = RING_SPACE(chan, 2);
+	if (ret)
+		return ret;
+
+	if (unlikely(chan->fence.sequence == chan->fence.sequence_ack - 1)) {
+		spin_lock_irqsave(&chan->fence.lock, flags);
+		nouveau_fence_update(chan);
+		spin_unlock_irqrestore(&chan->fence.lock, flags);
+
+		BUG_ON(chan->fence.sequence ==
+		       chan->fence.sequence_ack - 1);
+	}
+
+	fence->sequence = ++chan->fence.sequence;
+
+	kref_get(&fence->refcount);
+	spin_lock_irqsave(&chan->fence.lock, flags);
+	list_add_tail(&fence->entry, &chan->fence.pending);
+	spin_unlock_irqrestore(&chan->fence.lock, flags);
+
+	BEGIN_RING(chan, NvSubM2MF, USE_REFCNT ? 0x0050 : 0x0150, 1);
+	OUT_RING(chan, fence->sequence);
+	FIRE_RING(chan);
+
+	return 0;
+}
+
+void
+nouveau_fence_unref(void **sync_obj)
+{
+	struct nouveau_fence *fence = nouveau_fence(*sync_obj);
+
+	if (fence)
+		kref_put(&fence->refcount, nouveau_fence_del);
+	*sync_obj = NULL;
+}
+
+void *
+nouveau_fence_ref(void *sync_obj)
+{
+	struct nouveau_fence *fence = nouveau_fence(sync_obj);
+
+	kref_get(&fence->refcount);
+	return sync_obj;
+}
+
+bool
+nouveau_fence_signalled(void *sync_obj, void *sync_arg)
+{
+	struct nouveau_fence *fence = nouveau_fence(sync_obj);
+	struct nouveau_channel *chan = fence->channel;
+	unsigned long flags;
+
+	if (fence->signalled)
+		return true;
+
+	spin_lock_irqsave(&chan->fence.lock, flags);
+	nouveau_fence_update(chan);
+	spin_unlock_irqrestore(&chan->fence.lock, flags);
+	return fence->signalled;
+}
+
+int
+nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
+{
+	unsigned long timeout = jiffies + (3 * DRM_HZ);
+	int ret = 0;
+
+	__set_current_state(intr ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
+
+	while (1) {
+		if (nouveau_fence_signalled(sync_obj, sync_arg))
+			break;
+
+		if (time_after_eq(jiffies, timeout)) {
+			ret = -EBUSY;
+			break;
+		}
+
+		if (lazy)
+			schedule_timeout(1);
+
+		if (intr && signal_pending(current)) {
+			ret = -ERESTART;
+			break;
+		}
+	}
+
+	__set_current_state(TASK_RUNNING);
+
+	return ret;
+}
+
+int
+nouveau_fence_flush(void *sync_obj, void *sync_arg)
+{
+	return 0;
+}
+
+void
+nouveau_fence_handler(struct drm_device *dev, int channel)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nouveau_channel *chan = NULL;
+
+	if (channel >= 0 && channel < dev_priv->engine.fifo.channels)
+		chan = dev_priv->fifos[channel];
+
+	if (chan) {
+		spin_lock_irq(&chan->fence.lock);
+		nouveau_fence_update(chan);
+		spin_unlock_irq(&chan->fence.lock);
+	}
+}
+
+int
+nouveau_fence_init(struct nouveau_channel *chan)
+{
+	INIT_LIST_HEAD(&chan->fence.pending);
+	spin_lock_init(&chan->fence.lock);
+	return 0;
+}
+
+void
+nouveau_fence_fini(struct nouveau_channel *chan)
+{
+	struct list_head *entry, *tmp;
+	struct nouveau_fence *fence;
+
+	list_for_each_safe(entry, tmp, &chan->fence.pending) {
+		fence = list_entry(entry, struct nouveau_fence, entry);
+
+		fence->signalled = true;
+		list_del(&fence->entry);
+		kref_put(&fence->refcount, nouveau_fence_del);
+	}
+}
+