drm/nouveau: Implement weak channel references.
nouveau_channel_ref() takes a "weak" channel reference that doesn't prevent the hardware channel resources from being released, it just keeps the channel data structure alive. Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -125,7 +125,8 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
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chan->vram_handle = vram_handle;
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chan->gart_handle = gart_handle;
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atomic_set(&chan->refcount, 1);
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kref_init(&chan->ref);
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atomic_set(&chan->users, 1);
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mutex_init(&chan->mutex);
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mutex_lock(&chan->mutex);
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@ -133,7 +134,7 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
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spin_lock_irqsave(&dev_priv->channels.lock, flags);
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for (chan->id = 0; chan->id < pfifo->channels; chan->id++) {
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if (!dev_priv->channels.ptr[chan->id]) {
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dev_priv->channels.ptr[chan->id] = chan;
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nouveau_channel_ref(chan, &dev_priv->channels.ptr[chan->id]);
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break;
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}
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}
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@ -240,10 +241,12 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
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struct nouveau_channel *
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nouveau_channel_get_unlocked(struct nouveau_channel *ref)
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{
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if (likely(ref && atomic_inc_not_zero(&ref->refcount)))
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return ref;
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struct nouveau_channel *chan = NULL;
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return NULL;
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if (likely(ref && atomic_inc_not_zero(&ref->users)))
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nouveau_channel_ref(ref, &chan);
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return chan;
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}
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struct nouveau_channel *
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@ -281,15 +284,14 @@ nouveau_channel_put_unlocked(struct nouveau_channel **pchan)
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int ret;
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/* decrement the refcount, and we're done if there's still refs */
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if (likely(!atomic_dec_and_test(&chan->refcount))) {
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*pchan = NULL;
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if (likely(!atomic_dec_and_test(&chan->users))) {
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nouveau_channel_ref(NULL, pchan);
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return;
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}
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/* noone wants the channel anymore */
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NV_DEBUG(dev, "freeing channel %d\n", chan->id);
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nouveau_debugfs_channel_fini(chan);
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*pchan = NULL;
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/* give it chance to idle */
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nouveau_fence_update(chan);
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@ -333,7 +335,7 @@ nouveau_channel_put_unlocked(struct nouveau_channel **pchan)
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* remove it from the channel list
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*/
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spin_lock_irqsave(&dev_priv->channels.lock, flags);
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dev_priv->channels.ptr[chan->id] = NULL;
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nouveau_channel_ref(NULL, &dev_priv->channels.ptr[chan->id]);
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spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
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/* destroy any resources the channel owned */
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@ -345,10 +347,8 @@ nouveau_channel_put_unlocked(struct nouveau_channel **pchan)
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}
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nouveau_gpuobj_channel_takedown(chan);
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nouveau_notifier_takedown_channel(chan);
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if (chan->user)
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iounmap(chan->user);
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kfree(chan);
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nouveau_channel_ref(NULL, pchan);
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}
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void
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@ -358,6 +358,31 @@ nouveau_channel_put(struct nouveau_channel **pchan)
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nouveau_channel_put_unlocked(pchan);
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}
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static void
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nouveau_channel_del(struct kref *ref)
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{
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struct nouveau_channel *chan =
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container_of(ref, struct nouveau_channel, ref);
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if (chan->user)
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iounmap(chan->user);
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kfree(chan);
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}
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void
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nouveau_channel_ref(struct nouveau_channel *chan,
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struct nouveau_channel **pchan)
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{
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if (chan)
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kref_get(&chan->ref);
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if (*pchan)
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kref_put(&(*pchan)->ref, nouveau_channel_del);
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*pchan = chan;
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}
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/* cleans up all the fifos from file_priv */
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void
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nouveau_channel_cleanup(struct drm_device *dev, struct drm_file *file_priv)
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@ -373,7 +398,7 @@ nouveau_channel_cleanup(struct drm_device *dev, struct drm_file *file_priv)
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if (IS_ERR(chan))
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continue;
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atomic_dec(&chan->refcount);
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atomic_dec(&chan->users);
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nouveau_channel_put(&chan);
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}
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}
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@ -427,7 +452,7 @@ nouveau_ioctl_fifo_alloc(struct drm_device *dev, void *data,
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&init->notifier_handle);
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if (ret == 0)
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atomic_inc(&chan->refcount); /* userspace reference */
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atomic_inc(&chan->users); /* userspace reference */
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nouveau_channel_put(&chan);
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return ret;
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}
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@ -443,7 +468,7 @@ nouveau_ioctl_fifo_free(struct drm_device *dev, void *data,
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if (IS_ERR(chan))
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return PTR_ERR(chan);
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atomic_dec(&chan->refcount);
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atomic_dec(&chan->users);
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nouveau_channel_put(&chan);
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return 0;
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}
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@ -165,7 +165,11 @@ struct nouveau_channel {
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struct drm_device *dev;
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int id;
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atomic_t refcount;
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/* references to the channel data structure */
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struct kref ref;
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/* users of the hardware channel resources, the hardware
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* context will be kicked off when it reaches zero. */
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atomic_t users;
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struct mutex mutex;
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/* owner of this fifo */
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@ -808,6 +812,8 @@ extern struct nouveau_channel *
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nouveau_channel_get(struct drm_device *, struct drm_file *, int id);
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extern void nouveau_channel_put_unlocked(struct nouveau_channel **);
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extern void nouveau_channel_put(struct nouveau_channel **);
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extern void nouveau_channel_ref(struct nouveau_channel *chan,
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struct nouveau_channel **pchan);
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/* nouveau_object.c */
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extern int nouveau_gpuobj_early_init(struct drm_device *);
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