From 047d1d3cae2c4fc5be4fa20a97c8f5ba4fea1c56 Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Mon, 31 May 2010 12:00:43 +1000 Subject: [PATCH] drm/nouveau: reduce usage of fence spinlock to when absolutely necessary Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_channel.c | 2 -- drivers/gpu/drm/nouveau/nouveau_drv.h | 3 +-- drivers/gpu/drm/nouveau/nouveau_fence.c | 31 ++++++------------------------- drivers/gpu/drm/nouveau/nv04_graph.c | 3 +-- 4 files changed, 8 insertions(+), 31 deletions(-) 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_channel_free(struct nouveau_channel *chan) 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 nouveau_channel { 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_wait(void *obj, void *arg, bool lazy, bool intr); 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 @@ nouveau_fence_update(struct nouveau_channel *chan) 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 @@ nouveau_fence_update(struct nouveau_channel *chan) if (sequence == chan->fence.sequence_ack) break; } + spin_unlock(&chan->fence.lock); } int @@ -119,7 +121,6 @@ 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); @@ -127,9 +128,7 @@ nouveau_fence_emit(struct nouveau_fence *fence) 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 @@ nouveau_fence_emit(struct nouveau_fence *fence) 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 @@ 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; } @@ -221,27 +217,12 @@ 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); + 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 @@ static int 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; } -- 2.7.4