drm/nouveau: reduce usage of fence spinlock to when absolutely necessary
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_channel.c b/drivers/gpu/drm/nouveau/nouveau_channel.c
index 53daeba..90fdcda 100644
--- a/drivers/gpu/drm/nouveau/nouveau_channel.c
+++ b/drivers/gpu/drm/nouveau/nouveau_channel.c
@@ -258,9 +258,7 @@
nouveau_debugfs_channel_fini(chan);
/* Give outstanding push buffers a chance to complete */
- spin_lock_irqsave(&chan->fence.lock, flags);
nouveau_fence_update(chan);
- spin_unlock_irqrestore(&chan->fence.lock, flags);
if (chan->fence.sequence != chan->fence.sequence_ack) {
struct nouveau_fence *fence = NULL;
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 47fa28d..587a0ab 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -188,7 +188,7 @@
struct list_head pending;
uint32_t sequence;
uint32_t sequence_ack;
- uint32_t last_sequence_irq;
+ atomic_t last_sequence_irq;
} fence;
/* DMA push buffer */
@@ -1111,7 +1111,6 @@
extern int nouveau_fence_flush(void *obj, void *arg);
extern void nouveau_fence_unref(void **obj);
extern void *nouveau_fence_ref(void *obj);
-extern void nouveau_fence_handler(struct drm_device *dev, int channel);
/* nouveau_gem.c */
extern int nouveau_gem_new(struct drm_device *, struct nouveau_channel *,
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index faddf53..813d853 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -67,12 +67,13 @@
if (USE_REFCNT)
sequence = nvchan_rd32(chan, 0x48);
else
- sequence = chan->fence.last_sequence_irq;
+ sequence = atomic_read(&chan->fence.last_sequence_irq);
if (chan->fence.sequence_ack == sequence)
return;
chan->fence.sequence_ack = sequence;
+ spin_lock(&chan->fence.lock);
list_for_each_safe(entry, tmp, &chan->fence.pending) {
fence = list_entry(entry, struct nouveau_fence, entry);
@@ -84,6 +85,7 @@
if (sequence == chan->fence.sequence_ack)
break;
}
+ spin_unlock(&chan->fence.lock);
}
int
@@ -119,7 +121,6 @@
{
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);
@@ -127,9 +128,7 @@
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);
@@ -138,9 +137,9 @@
fence->sequence = ++chan->fence.sequence;
kref_get(&fence->refcount);
- spin_lock_irqsave(&chan->fence.lock, flags);
+ spin_lock(&chan->fence.lock);
list_add_tail(&fence->entry, &chan->fence.pending);
- spin_unlock_irqrestore(&chan->fence.lock, flags);
+ spin_unlock(&chan->fence.lock);
BEGIN_RING(chan, NvSubSw, USE_REFCNT ? 0x0050 : 0x0150, 1);
OUT_RING(chan, fence->sequence);
@@ -173,14 +172,11 @@
{
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;
}
@@ -221,27 +217,12 @@
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);
+ atomic_set(&chan->fence.last_sequence_irq, 0);
return 0;
}
diff --git a/drivers/gpu/drm/nouveau/nv04_graph.c b/drivers/gpu/drm/nouveau/nv04_graph.c
index dd09679..c897342 100644
--- a/drivers/gpu/drm/nouveau/nv04_graph.c
+++ b/drivers/gpu/drm/nouveau/nv04_graph.c
@@ -527,8 +527,7 @@
nv04_graph_mthd_set_ref(struct nouveau_channel *chan, int grclass,
int mthd, uint32_t data)
{
- chan->fence.last_sequence_irq = data;
- nouveau_fence_handler(chan->dev, chan->id);
+ atomic_set(&chan->fence.last_sequence_irq, data);
return 0;
}