1 files changed, 230 insertions, 0 deletions
diff --git a/linux-core/via_fence.c b/linux-core/via_fence.c
new file mode 100644
index 00000000..02249939
--- /dev/null
+++ b/linux-core/via_fence.c
@@ -0,0 +1,230 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007 Tungsten Graphics, Inc., Cedar Park, TX., USA,
+ * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "drmP.h"
+#include "via_drm.h"
+#include "via_drv.h"
+
+/*
+ * DRM_FENCE_TYPE_EXE guarantees that all command buffers can be evicted.
+ * DRM_VIA_FENCE_TYPE_ACCEL guarantees that all 2D & 3D rendering is complete.
+ */
+
+
+static uint32_t via_perform_flush(drm_device_t *dev, uint32_t class)
+{
+	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+	drm_fence_class_manager_t *fc = &dev->fm.class[class];
+	uint32_t pending_flush_types = 0;
+	uint32_t signaled_flush_types = 0;
+	uint32_t status;
+
+	if (class != 0)
+		return 0;
+
+	if (!dev_priv)
+		return 0;
+
+	spin_lock(&dev_priv->fence_lock);
+
+	pending_flush_types = fc->pending_flush |
+		((fc->pending_exe_flush) ? DRM_FENCE_TYPE_EXE : 0);
+
+	if (pending_flush_types) {
+
+		/*
+		 * Take the idlelock. This guarantees that the next time a client tries
+		 * to grab the lock, it will stall until the idlelock is released. This
+		 * guarantees that eventually, the GPU engines will be idle, but nothing
+		 * else. It cannot be used to protect the hardware.
+		 */
+
+
+		if (!dev_priv->have_idlelock) {
+			drm_idlelock_take(&dev->lock);
+			dev_priv->have_idlelock = 1;
+		}
+
+		/*
+		 * Check if AGP command reader is idle.
+		 */
+
+		if (pending_flush_types & DRM_FENCE_TYPE_EXE)
+			if (VIA_READ(0x41C) & 0x80000000)
+				signaled_flush_types |= DRM_FENCE_TYPE_EXE;
+
+		/*
+		 * Check VRAM command queue empty and 2D + 3D engines idle.
+		 */
+
+		if (pending_flush_types & DRM_VIA_FENCE_TYPE_ACCEL) {
+			status = VIA_READ(VIA_REG_STATUS);
+			if ((status & VIA_VR_QUEUE_BUSY) &&
+			    !(status & (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY | VIA_3D_ENG_BUSY)))
+				signaled_flush_types |= DRM_VIA_FENCE_TYPE_ACCEL;
+		}
+
+		if (signaled_flush_types) {
+			pending_flush_types &= ~signaled_flush_types;
+			if (!pending_flush_types && dev_priv->have_idlelock) {
+				drm_idlelock_release(&dev->lock);
+				dev_priv->have_idlelock = 0;
+			}
+			drm_fence_handler(dev, 0, dev_priv->emit_0_sequence, signaled_flush_types);
+		}
+	}
+
+	spin_unlock(&dev_priv->fence_lock);
+
+	return fc->pending_flush |
+		((fc->pending_exe_flush) ? DRM_FENCE_TYPE_EXE : 0);
+}
+
+
+/**
+ * Emit a fence sequence.
+ */
+
+int via_fence_emit_sequence(drm_device_t * dev, uint32_t class, uint32_t flags,
+			     uint32_t * sequence, uint32_t * native_type)
+{
+	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+	int ret = 0;
+
+	if (!dev_priv)
+		return -EINVAL;
+
+	switch(class) {
+	case 0: /* AGP command stream */
+
+		/*
+		 * The sequence number isn't really used by the hardware yet.
+		 */
+
+		spin_lock(&dev_priv->fence_lock);
+		*sequence = ++dev_priv->emit_0_sequence;
+		spin_unlock(&dev_priv->fence_lock);
+
+		/*
+		 * When drm_fence_handler() is called with flush type 0x01, and a
+		 * sequence number, That means that the EXE flag is expired.
+		 * Nothing else. No implicit flushing or other engines idle.
+		 */
+
+		*native_type = DRM_FENCE_TYPE_EXE;
+		break;
+	default:
+		ret = DRM_ERR(EINVAL);
+		break;
+	}
+	return ret;
+}
+
+/**
+ * Manual poll (from the fence manager).
+ */
+
+void via_poke_flush(drm_device_t * dev, uint32_t class)
+{
+	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+	drm_fence_manager_t *fm = &dev->fm;
+	unsigned long flags;
+	uint32_t pending_flush;
+
+	if (!dev_priv)
+		return ;
+
+	write_lock_irqsave(&fm->lock, flags);
+	pending_flush = via_perform_flush(dev, class);
+	if (pending_flush)
+		pending_flush = via_perform_flush(dev, class);
+	write_unlock_irqrestore(&fm->lock, flags);
+
+	/*
+	 * Kick the timer if there are more flushes pending.
+	 */
+
+	if (pending_flush && !timer_pending(&dev_priv->fence_timer)) {
+		dev_priv->fence_timer.expires = jiffies + 1;
+		add_timer(&dev_priv->fence_timer);
+	}
+}
+
+/**
+ * No irq fence expirations implemented yet.
+ * Although both the HQV engines and PCI dmablit engines signal
+ * idle with an IRQ, we haven't implemented this yet.
+ * This means that the drm fence manager will always poll for engine idle,
+ * unless the caller wanting to wait for a fence object has indicated a lazy wait.
+ */
+
+int via_fence_has_irq(struct drm_device * dev, uint32_t class,
+		      uint32_t flags)
+{
+	return 0;
+}
+
+/**
+ * Regularly call the flush function. This enables lazy waits, so we can
+ * set lazy_capable. Lazy waits don't really care when the fence expires,
+ * so a timer tick delay should be fine.
+ */
+
+void via_fence_timer(unsigned long data)
+{
+	drm_device_t *dev = (drm_device_t *) data;
+	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+	drm_fence_manager_t *fm = &dev->fm;
+	uint32_t pending_flush;
+	drm_fence_class_manager_t *fc = &dev->fm.class[0];
+
+	if (!dev_priv)
+		return;
+	if (!fm->initialized)
+		goto out_unlock;
+
+	via_poke_flush(dev, 0);
+	pending_flush = fc->pending_flush |
+		((fc->pending_exe_flush) ? DRM_FENCE_TYPE_EXE : 0);
+
+	/*
+	 * disable timer if there are no more flushes pending.
+	 */
+
+	if (!pending_flush && timer_pending(&dev_priv->fence_timer)) {
+		BUG_ON(dev_priv->have_idlelock);
+		del_timer(&dev_priv->fence_timer);
+	}
+	return;
+out_unlock:
+	return;
+
+}