drm/nouveau: create real execution engine for software object class

Just a cleanup more or less, and to remove the need for special handling of
software objects.

This removes a heap of documentation on dma/graph object formats.  The info
is very out of date with our current understanding, and is far better
documented in rnndb in envytools git.

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

drivers/gpu/drm/nouveau/nv04_software.c

@@ -0,0 +1,153 @@
+/*
+ * 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_ramht.h"
+#include "nouveau_software.h"
+#include "nouveau_hw.h"
+
+struct nv04_software_priv {
+	struct nouveau_software_priv base;
+};
+
+struct nv04_software_chan {
+	struct nouveau_software_chan base;
+};
+
+static int
+mthd_fence(struct nouveau_channel *chan, u32 class, u32 mthd, u32 data)
+{
+	atomic_set(&chan->fence.last_sequence_irq, data);
+	return 0;
+}
+
+static int
+mthd_flip(struct nouveau_channel *chan, u32 class, u32 mthd, u32 data)
+{
+
+	struct nouveau_page_flip_state state;
+
+	if (!nouveau_finish_page_flip(chan, &state)) {
+		nv_set_crtc_base(chan->dev, state.crtc, state.offset +
+				 state.y * state.pitch +
+				 state.x * state.bpp / 8);
+	}
+
+	return 0;
+}
+
+static int
+nv04_software_context_new(struct nouveau_channel *chan, int engine)
+{
+	struct nv04_software_chan *pch;
+
+	pch = kzalloc(sizeof(*pch), GFP_KERNEL);
+	if (!pch)
+		return -ENOMEM;
+
+	nouveau_software_context_new(&pch->base);
+	atomic_set(&chan->fence.last_sequence_irq, 0);
+	chan->engctx[engine] = pch;
+	return 0;
+}
+
+static void
+nv04_software_context_del(struct nouveau_channel *chan, int engine)
+{
+	struct nv04_software_chan *pch = chan->engctx[engine];
+	chan->engctx[engine] = NULL;
+	kfree(pch);
+}
+
+static int
+nv04_software_object_new(struct nouveau_channel *chan, int engine,
+			 u32 handle, u16 class)
+{
+	struct drm_device *dev = chan->dev;
+	struct nouveau_gpuobj *obj = NULL;
+	int ret;
+
+	ret = nouveau_gpuobj_new(dev, chan, 16, 16, 0, &obj);
+	if (ret)
+		return ret;
+	obj->engine = 0;
+	obj->class  = class;
+
+	ret = nouveau_ramht_insert(chan, handle, obj);
+	nouveau_gpuobj_ref(NULL, &obj);
+	return ret;
+}
+
+static int
+nv04_software_init(struct drm_device *dev, int engine)
+{
+	return 0;
+}
+
+static int
+nv04_software_fini(struct drm_device *dev, int engine, bool suspend)
+{
+	return 0;
+}
+
+static void
+nv04_software_destroy(struct drm_device *dev, int engine)
+{
+	struct nv04_software_priv *psw = nv_engine(dev, engine);
+
+	NVOBJ_ENGINE_DEL(dev, SW);
+	kfree(psw);
+}
+
+int
+nv04_software_create(struct drm_device *dev)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nv04_software_priv *psw;
+
+	psw = kzalloc(sizeof(*psw), GFP_KERNEL);
+	if (!psw)
+		return -ENOMEM;
+
+	psw->base.base.destroy = nv04_software_destroy;
+	psw->base.base.init = nv04_software_init;
+	psw->base.base.fini = nv04_software_fini;
+	psw->base.base.context_new = nv04_software_context_new;
+	psw->base.base.context_del = nv04_software_context_del;
+	psw->base.base.object_new = nv04_software_object_new;
+	nouveau_software_create(&psw->base);
+
+	NVOBJ_ENGINE_ADD(dev, SW, &psw->base.base);
+	if (dev_priv->card_type <= NV_04) {
+		NVOBJ_CLASS(dev, 0x006e, SW);
+		NVOBJ_MTHD (dev, 0x006e, 0x0150, mthd_fence);
+		NVOBJ_MTHD (dev, 0x006e, 0x0500, mthd_flip);
+	} else {
+		NVOBJ_CLASS(dev, 0x016e, SW);
+		NVOBJ_MTHD (dev, 0x016e, 0x0500, mthd_flip);
+	}
+
+	return 0;
+}