1. 根目录:
2. drivers
3. staging
4. gma500
5. psb_fence.c

/*
 * Copyright (c) 2007, Intel Corporation.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *
 * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
 */

#include <drm/drmP.h>
#include "psb_drv.h"


static void psb_fence_poll(struct ttm_fence_device *fdev,
			   uint32_t fence_class, uint32_t waiting_types)
{
	struct drm_psb_private *dev_priv =
	    container_of(fdev, struct drm_psb_private, fdev);


	if (unlikely(!dev_priv))
		return;

	if (waiting_types == 0)
		return;

	/* DRM_ERROR("Polling fence sequence, got 0x%08x\n", sequence); */
	ttm_fence_handler(fdev, fence_class, 0 /* Sequence */,
			_PSB_FENCE_TYPE_EXE, 0);
}

void psb_fence_error(struct drm_device *dev,
		     uint32_t fence_class,
		     uint32_t sequence, uint32_t type, int error)
{
	struct drm_psb_private *dev_priv = psb_priv(dev);
	struct ttm_fence_device *fdev = &dev_priv->fdev;
	unsigned long irq_flags;
	struct ttm_fence_class_manager *fc =
	    &fdev->fence_class[fence_class];

	BUG_ON(fence_class >= PSB_NUM_ENGINES);
	write_lock_irqsave(&fc->lock, irq_flags);
	ttm_fence_handler(fdev, fence_class, sequence, type, error);
	write_unlock_irqrestore(&fc->lock, irq_flags);
}

int psb_fence_emit_sequence(struct ttm_fence_device *fdev,
			    uint32_t fence_class,
			    uint32_t flags, uint32_t *sequence,
			    unsigned long *timeout_jiffies)
{
	struct drm_psb_private *dev_priv =
	    container_of(fdev, struct drm_psb_private, fdev);

	if (!dev_priv)
		return -EINVAL;

	if (fence_class >= PSB_NUM_ENGINES)
		return -EINVAL;

	DRM_ERROR("Unexpected fence class\n");
	return -EINVAL;
}

static void psb_fence_lockup(struct ttm_fence_object *fence,
			     uint32_t fence_types)
{
	DRM_ERROR("Unsupported fence class\n");
}

void psb_fence_handler(struct drm_device *dev, uint32_t fence_class)
{
	struct drm_psb_private *dev_priv = psb_priv(dev);
	struct ttm_fence_device *fdev = &dev_priv->fdev;
	struct ttm_fence_class_manager *fc =
	    &fdev->fence_class[fence_class];
	unsigned long irq_flags;

	write_lock_irqsave(&fc->lock, irq_flags);
	psb_fence_poll(fdev, fence_class, fc->waiting_types);
	write_unlock_irqrestore(&fc->lock, irq_flags);
}


static struct ttm_fence_driver psb_ttm_fence_driver = {
	.has_irq = NULL,
	.emit = psb_fence_emit_sequence,
	.flush = NULL,
	.poll = psb_fence_poll,
	.needed_flush = NULL,
	.wait = NULL,
	.signaled = NULL,
	.lockup = psb_fence_lockup,
};

int psb_ttm_fence_device_init(struct ttm_fence_device *fdev)
{
	struct drm_psb_private *dev_priv =
		container_of(fdev, struct drm_psb_private, fdev);
	struct ttm_fence_class_init fci = {.wrap_diff = (1 << 30),
		.flush_diff = (1 << 29),
		.sequence_mask = 0xFFFFFFFF
	};

	return ttm_fence_device_init(PSB_NUM_ENGINES,
				     dev_priv->mem_global_ref.object,
				     fdev, &fci, 1,
				     &psb_ttm_fence_driver);
}