drm/nouveau/fence: convert to exec engine, and improve channel sync

Now have a somewhat simpler semaphore sync implementation for nv17:nv84,
and a switched to using semaphores as fences on nv84+ and making use of
the hardware's >= acquire operation.

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

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nv04_fence.c b/drivers/gpu/drm/nouveau/nv04_fence.c
new file mode 100644
index 000000000000..08bd2ceaefef
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nv04_fence.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * 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 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 HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_dma.h"
+#include "nouveau_ramht.h"
+#include "nouveau_fence.h"
+
+struct nv04_fence_chan {
+        struct nouveau_fence_chan base;
+        atomic_t sequence;
+};
+
+struct nv04_fence_priv {
+        struct nouveau_fence_priv base;
+};
+
+static int
+nv04_fence_emit(struct nouveau_fence *fence)
+{
+        struct nouveau_channel *chan = fence->channel;
+        int ret = RING_SPACE(chan, 2);
+        if (ret == 0) {
+                BEGIN_NV04(chan, NvSubSw, 0x0150, 1);
+                OUT_RING  (chan, fence->sequence);
+                FIRE_RING (chan);
+        }
+        return ret;
+}
+
+static int
+nv04_fence_sync(struct nouveau_fence *fence, struct nouveau_channel *chan)
+{
+        return -ENODEV;
+}
+
+int
+nv04_fence_mthd(struct nouveau_channel *chan, u32 class, u32 mthd, u32 data)
+{
+        struct nv04_fence_chan *fctx = chan->engctx[NVOBJ_ENGINE_FENCE];
+        atomic_set(&fctx->sequence, data);
+        return 0;
+}
+
+static u32
+nv04_fence_read(struct nouveau_channel *chan)
+{
+        struct nv04_fence_chan *fctx = chan->engctx[NVOBJ_ENGINE_FENCE];
+        return atomic_read(&fctx->sequence);
+}
+
+static void
+nv04_fence_context_del(struct nouveau_channel *chan, int engine)
+{
+        struct nv04_fence_chan *fctx = chan->engctx[engine];
+        nouveau_fence_context_del(&fctx->base);
+        chan->engctx[engine] = NULL;
+        kfree(fctx);
+}
+
+static int
+nv04_fence_context_new(struct nouveau_channel *chan, int engine)
+{
+        struct nv04_fence_chan *fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
+        if (fctx) {
+                nouveau_fence_context_new(&fctx->base);
+                atomic_set(&fctx->sequence, 0);
+                chan->engctx[engine] = fctx;
+                return 0;
+        }
+        return -ENOMEM;
+}
+
+static int
+nv04_fence_fini(struct drm_device *dev, int engine, bool suspend)
+{
+        return 0;
+}
+
+static int
+nv04_fence_init(struct drm_device *dev, int engine)
+{
+        return 0;
+}
+
+static void
+nv04_fence_destroy(struct drm_device *dev, int engine)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nv04_fence_priv *priv = nv_engine(dev, engine);
+
+        dev_priv->eng[engine] = NULL;
+        kfree(priv);
+}
+
+int
+nv04_fence_create(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nv04_fence_priv *priv;
+        int ret;
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->base.engine.destroy = nv04_fence_destroy;
+        priv->base.engine.init = nv04_fence_init;
+        priv->base.engine.fini = nv04_fence_fini;
+        priv->base.engine.context_new = nv04_fence_context_new;
+        priv->base.engine.context_del = nv04_fence_context_del;
+        priv->base.emit = nv04_fence_emit;
+        priv->base.sync = nv04_fence_sync;
+        priv->base.read = nv04_fence_read;
+        dev_priv->eng[NVOBJ_ENGINE_FENCE] = &priv->base.engine;
+        return ret;
+}