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path: root/drivers/gpu/drm/nouveau/nouveau_fence.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_fence.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_fence.c262
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 000000000000..0cff7eb3690a
--- /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);
+ }
+}
+