drm/nouveau/fence: minor api changes for an upcoming rework

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 85 insertions, 130 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index f26177ac27e7..2c10d54fc493 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -32,47 +32,13 @@
 
 #include "nouveau_drv.h"
 #include "nouveau_ramht.h"
+#include "nouveau_fence.h"
 #include "nouveau_software.h"
 #include "nouveau_dma.h"
 
 #define USE_REFCNT(dev) (nouveau_private(dev)->chipset >= 0x10)
 #define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17)
 
-struct nouveau_fence {
-        struct nouveau_channel *channel;
-        struct kref refcount;
-        struct list_head entry;
-
-        uint32_t sequence;
-        bool signalled;
-        unsigned long timeout;
-
-        void (*work)(void *priv, bool signalled);
-        void *priv;
-};
-
-struct nouveau_semaphore {
-        struct kref ref;
-        struct drm_device *dev;
-        struct drm_mm_node *mem;
-};
-
-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);
-
-        nouveau_channel_ref(NULL, &fence->channel);
-        kfree(fence);
-}
-
 void
 nouveau_fence_update(struct nouveau_channel *chan)
 {
@@ -94,16 +60,16 @@ nouveau_fence_update(struct nouveau_channel *chan)
                 chan->fence.sequence_ack = sequence;
         }
 
-        list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
+        list_for_each_entry_safe(fence, tmp, &chan->fence.pending, head) {
                 if (fence->sequence > chan->fence.sequence_ack)
                         break;
 
-                fence->signalled = true;
-                list_del(&fence->entry);
+                fence->channel = NULL;
+                list_del(&fence->head);
                 if (fence->work)
                         fence->work(fence->priv, true);
 
-                kref_put(&fence->refcount, nouveau_fence_del);
+                nouveau_fence_unref(&fence);
         }
 
 out:
@@ -111,37 +77,8 @@ out:
 }
 
 int
-nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
-                  bool emit)
+nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
 {
-        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;
-}
-
-struct nouveau_channel *
-nouveau_fence_channel(struct nouveau_fence *fence)
-{
-        return fence ? nouveau_channel_get_unlocked(fence->channel) : NULL;
-}
-
-int
-nouveau_fence_emit(struct nouveau_fence *fence)
-{
-        struct nouveau_channel *chan = fence->channel;
         struct drm_device *dev = chan->dev;
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         int ret;
@@ -158,10 +95,11 @@ nouveau_fence_emit(struct nouveau_fence *fence)
         }
 
         fence->sequence = ++chan->fence.sequence;
+        fence->channel = chan;
 
-        kref_get(&fence->refcount);
+        kref_get(&fence->kref);
         spin_lock(&chan->fence.lock);
-        list_add_tail(&fence->entry, &chan->fence.pending);
+        list_add_tail(&fence->head, &chan->fence.pending);
         spin_unlock(&chan->fence.lock);
 
         if (USE_REFCNT(dev)) {
@@ -179,50 +117,12 @@ nouveau_fence_emit(struct nouveau_fence *fence)
         return 0;
 }
 
-void
-nouveau_fence_work(struct nouveau_fence *fence,
-                   void (*work)(void *priv, bool signalled),
-                   void *priv)
-{
-        BUG_ON(fence->work);
-
-        spin_lock(&fence->channel->fence.lock);
-
-        if (fence->signalled) {
-                work(priv, true);
-        } else {
-                fence->work = work;
-                fence->priv = priv;
-        }
-
-        spin_unlock(&fence->channel->fence.lock);
-}
-
-void
-nouveau_fence_unref(struct nouveau_fence **pfence)
-{
-        if (*pfence)
-                kref_put(&(*pfence)->refcount, nouveau_fence_del);
-        *pfence = NULL;
-}
-
-struct nouveau_fence *
-nouveau_fence_ref(struct nouveau_fence *fence)
-{
-        kref_get(&fence->refcount);
-        return fence;
-}
-
 bool
-nouveau_fence_signalled(struct nouveau_fence *fence)
+nouveau_fence_done(struct nouveau_fence *fence)
 {
-        struct nouveau_channel *chan = fence->channel;
-
-        if (fence->signalled)
-                return true;
-
-        nouveau_fence_update(chan);
-        return fence->signalled;
+        if (fence->channel)
+                nouveau_fence_update(fence->channel);
+        return !fence->channel;
 }
 
 int
@@ -232,8 +132,8 @@ nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
         ktime_t t;
         int ret = 0;
 
-        while (!nouveau_fence_signalled(fence)) {
-                if (time_after_eq(jiffies, fence->timeout)) {
+        while (!nouveau_fence_done(fence)) {
+                if (fence->timeout && time_after_eq(jiffies, fence->timeout)) {
                         ret = -EBUSY;
                         break;
                 }
@@ -255,10 +155,71 @@ nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
         }
 
         __set_current_state(TASK_RUNNING);
+        return ret;
+}
+
+static void
+nouveau_fence_del(struct kref *kref)
+{
+        struct nouveau_fence *fence = container_of(kref, typeof(*fence), kref);
+        kfree(fence);
+}
+
+void
+nouveau_fence_unref(struct nouveau_fence **pfence)
+{
+        if (*pfence)
+                kref_put(&(*pfence)->kref, nouveau_fence_del);
+        *pfence = NULL;
+}
+
+struct nouveau_fence *
+nouveau_fence_ref(struct nouveau_fence *fence)
+{
+        kref_get(&fence->kref);
+        return fence;
+}
+
+int
+nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence)
+{
+        struct nouveau_fence *fence;
+        int ret = 0;
 
+        fence = kzalloc(sizeof(*fence), GFP_KERNEL);
+        if (!fence)
+                return -ENOMEM;
+        kref_init(&fence->kref);
+
+        if (chan) {
+                ret = nouveau_fence_emit(fence, chan);
+                if (ret)
+                        nouveau_fence_unref(&fence);
+        }
+
+        *pfence = fence;
         return ret;
 }
 
+struct nouveau_semaphore {
+        struct kref ref;
+        struct drm_device *dev;
+        struct drm_mm_node *mem;
+};
+
+void
+nouveau_fence_work(struct nouveau_fence *fence,
+                   void (*work)(void *priv, bool signalled),
+                   void *priv)
+{
+        if (!fence->channel) {
+                work(priv, true);
+        } else {
+                fence->work = work;
+                fence->priv = priv;
+        }
+}
+
 static struct nouveau_semaphore *
 semaphore_alloc(struct drm_device *dev)
 {
@@ -367,7 +328,7 @@ semaphore_acquire(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
         }
 
         /* Delay semaphore destruction until its work is done */
-        ret = nouveau_fence_new(chan, &fence, true);
+        ret = nouveau_fence_new(chan, &fence);
         if (ret)
                 return ret;
 
@@ -421,7 +382,7 @@ semaphore_release(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
         }
 
         /* Delay semaphore destruction until its work is done */
-        ret = nouveau_fence_new(chan, &fence, true);
+        ret = nouveau_fence_new(chan, &fence);
         if (ret)
                 return ret;
 
@@ -435,13 +396,13 @@ int
 nouveau_fence_sync(struct nouveau_fence *fence,
                    struct nouveau_channel *wchan)
 {
-        struct nouveau_channel *chan = nouveau_fence_channel(fence);
+        struct nouveau_channel *chan;
         struct drm_device *dev = wchan->dev;
         struct nouveau_semaphore *sema;
         int ret = 0;
 
-        if (likely(!chan || chan == wchan ||
-                   nouveau_fence_signalled(fence)))
+        chan = fence ? nouveau_channel_get_unlocked(fence->channel) : NULL;
+        if (likely(!chan || chan == wchan || nouveau_fence_done(fence)))
                 goto out;
 
         sema = semaphore_alloc(dev);
@@ -480,12 +441,6 @@ out:
 }
 
 int
-__nouveau_fence_flush(void *sync_obj, void *sync_arg)
-{
-        return 0;
-}
-
-int
 nouveau_fence_channel_init(struct nouveau_channel *chan)
 {
         struct drm_device *dev = chan->dev;
@@ -538,14 +493,14 @@ nouveau_fence_channel_fini(struct nouveau_channel *chan)
         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);
+        list_for_each_entry_safe(fence, tmp, &chan->fence.pending, head) {
+                fence->channel = NULL;
+                list_del(&fence->head);
 
                 if (unlikely(fence->work))
                         fence->work(fence->priv, false);
 
-                kref_put(&fence->refcount, nouveau_fence_del);
+                kref_put(&fence->kref, nouveau_fence_del);
         }
         spin_unlock(&chan->fence.lock);