From c1aa08106e0a7190c7a303ec8a9b6b5339251137 Mon Sep 17 00:00:00 2001
From: Jeremy Kolb <jkolb@brandeis.edu>
Date: Fri, 2 Nov 2007 19:43:53 -0400
Subject: nouveau:  Add darktama's fencing code.  Restructure some stuff.

---
 linux-core/nouveau_fence.c | 129 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 linux-core/nouveau_fence.c

(limited to 'linux-core/nouveau_fence.c')

diff --git a/linux-core/nouveau_fence.c b/linux-core/nouveau_fence.c
new file mode 100644
index 00000000..e510aec7
--- /dev/null
+++ b/linux-core/nouveau_fence.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2007 Ben Skeggs.
+ * All Rights Reserved.
+ *
+ * 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 (including the
+ * next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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.
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "nouveau_drv.h"
+#include "nouveau_dma.h"
+
+static int
+nouveau_fence_has_irq(struct drm_device *dev, uint32_t class, uint32_t flags)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+	DRM_DEBUG("class=%d, flags=0x%08x\n", class, flags);
+
+	/* DRM's channel always uses IRQs to signal fences */
+	if (class == dev_priv->channel.chan->id)
+		return 1;
+
+	/* Other channels don't use IRQs at all yet */
+	return 0;
+}
+
+static int
+nouveau_fence_emit(struct drm_device *dev, uint32_t class, uint32_t flags,
+		   uint32_t *breadcrumb, uint32_t *native_type)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nouveau_channel *chan = dev_priv->fifos[class];
+	struct nouveau_drm_channel *dchan = &dev_priv->channel;
+
+	DRM_DEBUG("class=%d, flags=0x%08x\n", class, flags);
+
+	/* We can't emit fences on client channels */
+	if (chan != dchan->chan)
+		return 0;
+
+	*breadcrumb  = ++dchan->next_sequence;
+	*native_type = DRM_FENCE_TYPE_EXE;
+
+	BEGIN_RING(NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_SET_REF, 1);
+	OUT_RING  (*breadcrumb);
+	BEGIN_RING(NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY, 1);
+	OUT_RING  (NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY_STYLE_WRITE_LE_AWAKEN);
+	BEGIN_RING(NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_NOP, 1);
+	OUT_RING  (0);
+	FIRE_RING ();
+
+	return 0;
+}
+
+static void
+nouveau_fence_perform_flush(struct drm_device *dev, uint32_t class)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct drm_fence_class_manager *fc = &dev->fm.fence_class[class];
+	uint32_t pending_types = 0;
+
+	DRM_DEBUG("class=%d\n", class);
+
+	pending_types = fc->pending_flush |
+			((fc->pending_exe_flush) ? DRM_FENCE_TYPE_EXE : 0);
+
+	if (pending_types) {
+		uint32_t sequence = NV_READ(NV03_FIFO_REGS(class) + 0x48);
+
+		drm_fence_handler(dev, class, sequence, pending_types, 0);
+	}
+}
+
+static void
+nouveau_fence_poke_flush(struct drm_device *dev, uint32_t class)
+{
+	struct drm_fence_manager *fm = &dev->fm;
+	unsigned long flags;
+
+	DRM_DEBUG("class=%d\n", class);
+
+	write_lock_irqsave(&fm->lock, flags);
+	nouveau_fence_perform_flush(dev, class);
+	write_unlock_irqrestore(&fm->lock, flags);
+}
+
+void
+nouveau_fence_handler(struct drm_device *dev, int channel)
+{
+	struct drm_fence_manager *fm = &dev->fm;
+
+	DRM_DEBUG("class=%d\n", channel);
+
+	write_lock(&fm->lock);
+	nouveau_fence_perform_flush(dev, channel);
+	write_unlock(&fm->lock);
+}
+
+struct drm_fence_driver nouveau_fence_driver = {
+	.num_classes	= 8,
+	.wrap_diff	= (1 << 30),
+	.flush_diff	= (1 << 29),
+	.sequence_mask	= 0xffffffffU,
+	.lazy_capable	= 1,
+	.has_irq	= nouveau_fence_has_irq,
+	.emit		= nouveau_fence_emit,
+	.poke_flush	= nouveau_fence_poke_flush
+};
+
-- 
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