1 files changed, 200 insertions, 477 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 2f6daae68b9..ab5ea3b0d66 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -24,229 +24,233 @@
  *
  */
 
-#include "drmP.h"
-#include "drm.h"
+#include <drm/drmP.h>
 
 #include <linux/ktime.h>
 #include <linux/hrtimer.h>
 
-#include "nouveau_drv.h"
-#include "nouveau_ramht.h"
+#include "nouveau_drm.h"
 #include "nouveau_dma.h"
+#include "nouveau_fence.h"
 
-#define USE_REFCNT(dev) (nouveau_private(dev)->chipset >= 0x10)
-#define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17)
+#include <engine/fifo.h>
 
-struct nouveau_fence {
-	struct nouveau_channel *channel;
-	struct kref refcount;
-	struct list_head entry;
-
-	uint32_t sequence;
-	bool signalled;
-
-	void (*work)(void *priv, bool signalled);
-	void *priv;
-};
-
-struct nouveau_semaphore {
-	struct kref ref;
-	struct drm_device *dev;
-	struct drm_mm_node *mem;
+struct fence_work {
+	struct work_struct base;
+	struct list_head head;
+	void (*func)(void *);
+	void *data;
 };
 
-static inline struct nouveau_fence *
-nouveau_fence(void *sync_obj)
-{
-	return (struct nouveau_fence *)sync_obj;
-}
-
 static void
-nouveau_fence_del(struct kref *ref)
+nouveau_fence_signal(struct nouveau_fence *fence)
 {
-	struct nouveau_fence *fence =
-		container_of(ref, struct nouveau_fence, refcount);
+	struct fence_work *work, *temp;
 
-	nouveau_channel_ref(NULL, &fence->channel);
-	kfree(fence);
+	list_for_each_entry_safe(work, temp, &fence->work, head) {
+		schedule_work(&work->base);
+		list_del(&work->head);
+	}
+
+	fence->channel = NULL;
+	list_del(&fence->head);
 }
 
 void
-nouveau_fence_update(struct nouveau_channel *chan)
+nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
 {
-	struct drm_device *dev = chan->dev;
-	struct nouveau_fence *tmp, *fence;
-	uint32_t sequence;
-
-	spin_lock(&chan->fence.lock);
-
-	/* Fetch the last sequence if the channel is still up and running */
-	if (likely(!list_empty(&chan->fence.pending))) {
-		if (USE_REFCNT(dev))
-			sequence = nvchan_rd32(chan, 0x48);
-		else
-			sequence = atomic_read(&chan->fence.last_sequence_irq);
-
-		if (chan->fence.sequence_ack == sequence)
-			goto out;
-		chan->fence.sequence_ack = sequence;
+	struct nouveau_fence *fence, *fnext;
+	spin_lock(&fctx->lock);
+	list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
+		nouveau_fence_signal(fence);
 	}
-
-	list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
-		sequence = fence->sequence;
-		fence->signalled = true;
-		list_del(&fence->entry);
-
-		if (unlikely(fence->work))
-			fence->work(fence->priv, true);
-
-		kref_put(&fence->refcount, nouveau_fence_del);
-
-		if (sequence == chan->fence.sequence_ack)
-			break;
-	}
-out:
-	spin_unlock(&chan->fence.lock);
+	spin_unlock(&fctx->lock);
 }
 
-int
-nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
-		  bool emit)
+void
+nouveau_fence_context_new(struct nouveau_fence_chan *fctx)
 {
-	struct nouveau_fence *fence;
-	int ret = 0;
-
-	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
-	if (!fence)
-		return -ENOMEM;
-	kref_init(&fence->refcount);
-	nouveau_channel_ref(chan, &fence->channel);
-
-	if (emit)
-		ret = nouveau_fence_emit(fence);
-
-	if (ret)
-		nouveau_fence_unref(&fence);
-	*pfence = fence;
-	return ret;
+	INIT_LIST_HEAD(&fctx->flip);
+	INIT_LIST_HEAD(&fctx->pending);
+	spin_lock_init(&fctx->lock);
 }
 
-struct nouveau_channel *
-nouveau_fence_channel(struct nouveau_fence *fence)
+static void
+nouveau_fence_work_handler(struct work_struct *kwork)
 {
-	return fence ? nouveau_channel_get_unlocked(fence->channel) : NULL;
+	struct fence_work *work = container_of(kwork, typeof(*work), base);
+	work->func(work->data);
+	kfree(work);
 }
 
-int
-nouveau_fence_emit(struct nouveau_fence *fence)
+void
+nouveau_fence_work(struct nouveau_fence *fence,
+		   void (*func)(void *), void *data)
 {
 	struct nouveau_channel *chan = fence->channel;
-	struct drm_device *dev = chan->dev;
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	int ret;
+	struct nouveau_fence_chan *fctx;
+	struct fence_work *work = NULL;
 
-	ret = RING_SPACE(chan, 2);
-	if (ret)
-		return ret;
+	if (nouveau_fence_done(fence)) {
+		func(data);
+		return;
+	}
 
-	if (unlikely(chan->fence.sequence == chan->fence.sequence_ack - 1)) {
-		nouveau_fence_update(chan);
+	fctx = chan->fence;
+	work = kmalloc(sizeof(*work), GFP_KERNEL);
+	if (!work) {
+		WARN_ON(nouveau_fence_wait(fence, false, false));
+		func(data);
+		return;
+	}
 
-		BUG_ON(chan->fence.sequence ==
-		       chan->fence.sequence_ack - 1);
+	spin_lock(&fctx->lock);
+	if (!fence->channel) {
+		spin_unlock(&fctx->lock);
+		kfree(work);
+		func(data);
+		return;
 	}
 
-	fence->sequence = ++chan->fence.sequence;
+	INIT_WORK(&work->base, nouveau_fence_work_handler);
+	work->func = func;
+	work->data = data;
+	list_add(&work->head, &fence->work);
+	spin_unlock(&fctx->lock);
+}
 
-	kref_get(&fence->refcount);
-	spin_lock(&chan->fence.lock);
-	list_add_tail(&fence->entry, &chan->fence.pending);
-	spin_unlock(&chan->fence.lock);
+static void
+nouveau_fence_update(struct nouveau_channel *chan)
+{
+	struct nouveau_fence_chan *fctx = chan->fence;
+	struct nouveau_fence *fence, *fnext;
 
-	if (USE_REFCNT(dev)) {
-		if (dev_priv->card_type < NV_C0)
-			BEGIN_RING(chan, NvSubSw, 0x0050, 1);
-		else
-			BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0050, 1);
-	} else {
-		BEGIN_RING(chan, NvSubSw, 0x0150, 1);
-	}
-	OUT_RING (chan, fence->sequence);
-	FIRE_RING(chan);
+	spin_lock(&fctx->lock);
+	list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
+		if (fctx->read(chan) < fence->sequence)
+			break;
 
-	return 0;
+		nouveau_fence_signal(fence);
+		nouveau_fence_unref(&fence);
+	}
+	spin_unlock(&fctx->lock);
 }
 
-void
-nouveau_fence_work(struct nouveau_fence *fence,
-		   void (*work)(void *priv, bool signalled),
-		   void *priv)
+int
+nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
 {
-	BUG_ON(fence->work);
+	struct nouveau_fence_chan *fctx = chan->fence;
+	int ret;
 
-	spin_lock(&fence->channel->fence.lock);
+	fence->channel  = chan;
+	fence->timeout  = jiffies + (15 * HZ);
+	fence->sequence = ++fctx->sequence;
 
-	if (fence->signalled) {
-		work(priv, true);
-	} else {
-		fence->work = work;
-		fence->priv = priv;
+	ret = fctx->emit(fence);
+	if (!ret) {
+		kref_get(&fence->kref);
+		spin_lock(&fctx->lock);
+		list_add_tail(&fence->head, &fctx->pending);
+		spin_unlock(&fctx->lock);
 	}
 
-	spin_unlock(&fence->channel->fence.lock);
+	return ret;
 }
 
-void
-__nouveau_fence_unref(void **sync_obj)
+bool
+nouveau_fence_done(struct nouveau_fence *fence)
 {
-	struct nouveau_fence *fence = nouveau_fence(*sync_obj);
-
-	if (fence)
-		kref_put(&fence->refcount, nouveau_fence_del);
-	*sync_obj = NULL;
+	if (fence->channel)
+		nouveau_fence_update(fence->channel);
+	return !fence->channel;
 }
 
-void *
-__nouveau_fence_ref(void *sync_obj)
+static int
+nouveau_fence_wait_uevent_handler(void *data, u32 type, int index)
 {
-	struct nouveau_fence *fence = nouveau_fence(sync_obj);
-
-	kref_get(&fence->refcount);
-	return sync_obj;
+	struct nouveau_fence_priv *priv = data;
+	wake_up_all(&priv->waiting);
+	return NVKM_EVENT_KEEP;
 }
 
-bool
-__nouveau_fence_signalled(void *sync_obj, void *sync_arg)
+static int
+nouveau_fence_wait_uevent(struct nouveau_fence *fence, bool intr)
+
 {
-	struct nouveau_fence *fence = nouveau_fence(sync_obj);
 	struct nouveau_channel *chan = fence->channel;
+	struct nouveau_fifo *pfifo = nouveau_fifo(chan->drm->device);
+	struct nouveau_fence_priv *priv = chan->drm->fence;
+	struct nouveau_eventh *handler;
+	int ret = 0;
+
+	ret = nouveau_event_new(pfifo->uevent, 1, 0,
+				nouveau_fence_wait_uevent_handler,
+				priv, &handler);
+	if (ret)
+		return ret;
+
+	nouveau_event_get(handler);
+
+	if (fence->timeout) {
+		unsigned long timeout = fence->timeout - jiffies;
+
+		if (time_before(jiffies, fence->timeout)) {
+			if (intr) {
+				ret = wait_event_interruptible_timeout(
+						priv->waiting,
+						nouveau_fence_done(fence),
+						timeout);
+			} else {
+				ret = wait_event_timeout(priv->waiting,
+						nouveau_fence_done(fence),
+						timeout);
+			}
+		}
+
+		if (ret >= 0) {
+			fence->timeout = jiffies + ret;
+			if (time_after_eq(jiffies, fence->timeout))
+				ret = -EBUSY;
+		}
+	} else {
+		if (intr) {
+			ret = wait_event_interruptible(priv->waiting,
+					nouveau_fence_done(fence));
+		} else {
+			wait_event(priv->waiting, nouveau_fence_done(fence));
+		}
+	}
 
-	if (fence->signalled)
-		return true;
+	nouveau_event_ref(NULL, &handler);
+	if (unlikely(ret < 0))
+		return ret;
 
-	nouveau_fence_update(chan);
-	return fence->signalled;
+	return 0;
 }
 
 int
-__nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
+nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
 {
-	unsigned long timeout = jiffies + (3 * DRM_HZ);
+	struct nouveau_channel *chan = fence->channel;
+	struct nouveau_fence_priv *priv = chan ? chan->drm->fence : NULL;
 	unsigned long sleep_time = NSEC_PER_MSEC / 1000;
 	ktime_t t;
 	int ret = 0;
 
-	while (1) {
-		if (__nouveau_fence_signalled(sync_obj, sync_arg))
-			break;
+	while (priv && priv->uevent && lazy && !nouveau_fence_done(fence)) {
+		ret = nouveau_fence_wait_uevent(fence, intr);
+		if (ret < 0)
+			return ret;
+	}
 
-		if (time_after_eq(jiffies, timeout)) {
+	while (!nouveau_fence_done(fence)) {
+		if (fence->timeout && time_after_eq(jiffies, fence->timeout)) {
 			ret = -EBUSY;
 			break;
 		}
 
-		__set_current_state(intr ? TASK_INTERRUPTIBLE
-			: TASK_UNINTERRUPTIBLE);
+		__set_current_state(intr ? TASK_INTERRUPTIBLE :
+					   TASK_UNINTERRUPTIBLE);
 		if (lazy) {
 			t = ktime_set(0, sleep_time);
 			schedule_hrtimeout(&t, HRTIMER_MODE_REL);
@@ -262,354 +266,73 @@ __nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
 	}
 
 	__set_current_state(TASK_RUNNING);
-
 	return ret;
 }
 
-static struct nouveau_semaphore *
-semaphore_alloc(struct drm_device *dev)
-{
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_semaphore *sema;
-	int size = (dev_priv->chipset < 0x84) ? 4 : 16;
-	int ret, i;
-
-	if (!USE_SEMA(dev))
-		return NULL;
-
-	sema = kmalloc(sizeof(*sema), GFP_KERNEL);
-	if (!sema)
-		goto fail;
-
-	ret = drm_mm_pre_get(&dev_priv->fence.heap);
-	if (ret)
-		goto fail;
-
-	spin_lock(&dev_priv->fence.lock);
-	sema->mem = drm_mm_search_free(&dev_priv->fence.heap, size, 0, 0);
-	if (sema->mem)
-		sema->mem = drm_mm_get_block_atomic(sema->mem, size, 0);
-	spin_unlock(&dev_priv->fence.lock);
-
-	if (!sema->mem)
-		goto fail;
-
-	kref_init(&sema->ref);
-	sema->dev = dev;
-	for (i = sema->mem->start; i < sema->mem->start + size; i += 4)
-		nouveau_bo_wr32(dev_priv->fence.bo, i / 4, 0);
-
-	return sema;
-fail:
-	kfree(sema);
-	return NULL;
-}
-
-static void
-semaphore_free(struct kref *ref)
-{
-	struct nouveau_semaphore *sema =
-		container_of(ref, struct nouveau_semaphore, ref);
-	struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
-
-	spin_lock(&dev_priv->fence.lock);
-	drm_mm_put_block(sema->mem);
-	spin_unlock(&dev_priv->fence.lock);
-
-	kfree(sema);
-}
-
-static void
-semaphore_work(void *priv, bool signalled)
-{
-	struct nouveau_semaphore *sema = priv;
-	struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
-
-	if (unlikely(!signalled))
-		nouveau_bo_wr32(dev_priv->fence.bo, sema->mem->start / 4, 1);
-
-	kref_put(&sema->ref, semaphore_free);
-}
-
-static int
-semaphore_acquire(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
-{
-	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
-	struct nouveau_fence *fence = NULL;
-	u64 offset = chan->fence.vma.offset + sema->mem->start;
-	int ret;
-
-	if (dev_priv->chipset < 0x84) {
-		ret = RING_SPACE(chan, 4);
-		if (ret)
-			return ret;
-
-		BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 3);
-		OUT_RING  (chan, NvSema);
-		OUT_RING  (chan, offset);
-		OUT_RING  (chan, 1);
-	} else
-	if (dev_priv->chipset < 0xc0) {
-		ret = RING_SPACE(chan, 7);
-		if (ret)
-			return ret;
-
-		BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1);
-		OUT_RING  (chan, chan->vram_handle);
-		BEGIN_RING(chan, NvSubSw, 0x0010, 4);
-		OUT_RING  (chan, upper_32_bits(offset));
-		OUT_RING  (chan, lower_32_bits(offset));
-		OUT_RING  (chan, 1);
-		OUT_RING  (chan, 1); /* ACQUIRE_EQ */
-	} else {
-		ret = RING_SPACE(chan, 5);
-		if (ret)
-			return ret;
-
-		BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0010, 4);
-		OUT_RING  (chan, upper_32_bits(offset));
-		OUT_RING  (chan, lower_32_bits(offset));
-		OUT_RING  (chan, 1);
-		OUT_RING  (chan, 0x1001); /* ACQUIRE_EQ */
-	}
-
-	/* Delay semaphore destruction until its work is done */
-	ret = nouveau_fence_new(chan, &fence, true);
-	if (ret)
-		return ret;
-
-	kref_get(&sema->ref);
-	nouveau_fence_work(fence, semaphore_work, sema);
-	nouveau_fence_unref(&fence);
-	return 0;
-}
-
-static int
-semaphore_release(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
-{
-	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
-	struct nouveau_fence *fence = NULL;
-	u64 offset = chan->fence.vma.offset + sema->mem->start;
-	int ret;
-
-	if (dev_priv->chipset < 0x84) {
-		ret = RING_SPACE(chan, 5);
-		if (ret)
-			return ret;
-
-		BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 2);
-		OUT_RING  (chan, NvSema);
-		OUT_RING  (chan, offset);
-		BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_RELEASE, 1);
-		OUT_RING  (chan, 1);
-	} else
-	if (dev_priv->chipset < 0xc0) {
-		ret = RING_SPACE(chan, 7);
-		if (ret)
-			return ret;
-
-		BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1);
-		OUT_RING  (chan, chan->vram_handle);
-		BEGIN_RING(chan, NvSubSw, 0x0010, 4);
-		OUT_RING  (chan, upper_32_bits(offset));
-		OUT_RING  (chan, lower_32_bits(offset));
-		OUT_RING  (chan, 1);
-		OUT_RING  (chan, 2); /* RELEASE */
-	} else {
-		ret = RING_SPACE(chan, 5);
-		if (ret)
-			return ret;
-
-		BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0010, 4);
-		OUT_RING  (chan, upper_32_bits(offset));
-		OUT_RING  (chan, lower_32_bits(offset));
-		OUT_RING  (chan, 1);
-		OUT_RING  (chan, 0x1002); /* RELEASE */
-	}
-
-	/* Delay semaphore destruction until its work is done */
-	ret = nouveau_fence_new(chan, &fence, true);
-	if (ret)
-		return ret;
-
-	kref_get(&sema->ref);
-	nouveau_fence_work(fence, semaphore_work, sema);
-	nouveau_fence_unref(&fence);
-	return 0;
-}
-
 int
-nouveau_fence_sync(struct nouveau_fence *fence,
-		   struct nouveau_channel *wchan)
+nouveau_fence_sync(struct nouveau_fence *fence, struct nouveau_channel *chan)
 {
-	struct nouveau_channel *chan = nouveau_fence_channel(fence);
-	struct drm_device *dev = wchan->dev;
-	struct nouveau_semaphore *sema;
+	struct nouveau_fence_chan *fctx = chan->fence;
+	struct nouveau_channel *prev;
 	int ret = 0;
 
-	if (likely(!chan || chan == wchan ||
-		   nouveau_fence_signalled(fence)))
-		goto out;
-
-	sema = semaphore_alloc(dev);
-	if (!sema) {
-		/* Early card or broken userspace, fall back to
-		 * software sync. */
-		ret = nouveau_fence_wait(fence, true, false);
-		goto out;
-	}
-
-	/* try to take chan's mutex, if we can't take it right away
-	 * we have to fallback to software sync to prevent locking
-	 * order issues
-	 */
-	if (!mutex_trylock(&chan->mutex)) {
-		ret = nouveau_fence_wait(fence, true, false);
-		goto out_unref;
+	prev = fence ? fence->channel : NULL;
+	if (prev) {
+		if (unlikely(prev != chan && !nouveau_fence_done(fence))) {
+			ret = fctx->sync(fence, prev, chan);
+			if (unlikely(ret))
+				ret = nouveau_fence_wait(fence, true, false);
+		}
 	}
 
-	/* Make wchan wait until it gets signalled */
-	ret = semaphore_acquire(wchan, sema);
-	if (ret)
-		goto out_unlock;
-
-	/* Signal the semaphore from chan */
-	ret = semaphore_release(chan, sema);
-
-out_unlock:
-	mutex_unlock(&chan->mutex);
-out_unref:
-	kref_put(&sema->ref, semaphore_free);
-out:
-	if (chan)
-		nouveau_channel_put_unlocked(&chan);
 	return ret;
 }
 
-int
-__nouveau_fence_flush(void *sync_obj, void *sync_arg)
+static void
+nouveau_fence_del(struct kref *kref)
 {
-	return 0;
+	struct nouveau_fence *fence = container_of(kref, typeof(*fence), kref);
+	kfree(fence);
 }
 
-int
-nouveau_fence_channel_init(struct nouveau_channel *chan)
+void
+nouveau_fence_unref(struct nouveau_fence **pfence)
 {
-	struct drm_device *dev = chan->dev;
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_gpuobj *obj = NULL;
-	int ret;
-
-	if (dev_priv->card_type < NV_C0) {
-		/* Create an NV_SW object for various sync purposes */
-		ret = nouveau_gpuobj_gr_new(chan, NvSw, NV_SW);
-		if (ret)
-			return ret;
-
-		ret = RING_SPACE(chan, 2);
-		if (ret)
-			return ret;
-
-		BEGIN_RING(chan, NvSubSw, 0, 1);
-		OUT_RING  (chan, NvSw);
-		FIRE_RING (chan);
-	}
-
-	/* Setup area of memory shared between all channels for x-chan sync */
-	if (USE_SEMA(dev) && dev_priv->chipset < 0x84) {
-		struct ttm_mem_reg *mem = &dev_priv->fence.bo->bo.mem;
-
-		ret = nouveau_gpuobj_dma_new(chan, NV_CLASS_DMA_FROM_MEMORY,
-					     mem->start << PAGE_SHIFT,
-					     mem->size, NV_MEM_ACCESS_RW,
-					     NV_MEM_TARGET_VRAM, &obj);
-		if (ret)
-			return ret;
-
-		ret = nouveau_ramht_insert(chan, NvSema, obj);
-		nouveau_gpuobj_ref(NULL, &obj);
-		if (ret)
-			return ret;
-	} else
-	if (USE_SEMA(dev)) {
-		/* map fence bo into channel's vm */
-		ret = nouveau_bo_vma_add(dev_priv->fence.bo, chan->vm,
-					 &chan->fence.vma);
-		if (ret)
-			return ret;
-	}
-
-	atomic_set(&chan->fence.last_sequence_irq, 0);
-	return 0;
+	if (*pfence)
+		kref_put(&(*pfence)->kref, nouveau_fence_del);
+	*pfence = NULL;
 }
 
-void
-nouveau_fence_channel_fini(struct nouveau_channel *chan)
+struct nouveau_fence *
+nouveau_fence_ref(struct nouveau_fence *fence)
 {
-	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
-	struct nouveau_fence *tmp, *fence;
-
-	spin_lock(&chan->fence.lock);
-	list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
-		fence->signalled = true;
-		list_del(&fence->entry);
-
-		if (unlikely(fence->work))
-			fence->work(fence->priv, false);
-
-		kref_put(&fence->refcount, nouveau_fence_del);
-	}
-	spin_unlock(&chan->fence.lock);
-
-	nouveau_bo_vma_del(dev_priv->fence.bo, &chan->fence.vma);
+	if (fence)
+		kref_get(&fence->kref);
+	return fence;
 }
 
 int
-nouveau_fence_init(struct drm_device *dev)
+nouveau_fence_new(struct nouveau_channel *chan, bool sysmem,
+		  struct nouveau_fence **pfence)
 {
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	int size = (dev_priv->chipset < 0x84) ? 4096 : 16384;
-	int ret;
-
-	/* Create a shared VRAM heap for cross-channel sync. */
-	if (USE_SEMA(dev)) {
-		ret = nouveau_bo_new(dev, size, 0, TTM_PL_FLAG_VRAM,
-				     0, 0, &dev_priv->fence.bo);
-		if (ret)
-			return ret;
+	struct nouveau_fence *fence;
+	int ret = 0;
 
-		ret = nouveau_bo_pin(dev_priv->fence.bo, TTM_PL_FLAG_VRAM);
-		if (ret)
-			goto fail;
+	if (unlikely(!chan->fence))
+		return -ENODEV;
 
-		ret = nouveau_bo_map(dev_priv->fence.bo);
-		if (ret)
-			goto fail;
+	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
+	if (!fence)
+		return -ENOMEM;
 
-		ret = drm_mm_init(&dev_priv->fence.heap, 0,
-				  dev_priv->fence.bo->bo.mem.size);
-		if (ret)
-			goto fail;
+	INIT_LIST_HEAD(&fence->work);
+	fence->sysmem = sysmem;
+	kref_init(&fence->kref);
 
-		spin_lock_init(&dev_priv->fence.lock);
-	}
+	ret = nouveau_fence_emit(fence, chan);
+	if (ret)
+		nouveau_fence_unref(&fence);
 
-	return 0;
-fail:
-	nouveau_bo_unmap(dev_priv->fence.bo);
-	nouveau_bo_ref(NULL, &dev_priv->fence.bo);
+	*pfence = fence;
 	return ret;
 }
-
-void
-nouveau_fence_fini(struct drm_device *dev)
-{
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-
-	if (USE_SEMA(dev)) {
-		drm_mm_takedown(&dev_priv->fence.heap);
-		nouveau_bo_unmap(dev_priv->fence.bo);
-		nouveau_bo_unpin(dev_priv->fence.bo);
-		nouveau_bo_ref(NULL, &dev_priv->fence.bo);
-	}
-}