radeon_cp.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

		return -EINVAL;
	}
	if ( dev_priv->cp_running ) {
		DRM_DEBUG( "%s while CP running\n", __FUNCTION__ );
		return 0;
	}
	if ( dev_priv->cp_mode == RADEON_CSQ_PRIDIS_INDDIS ) {
		DRM_DEBUG( "%s called with bogus CP mode (%d)\n",
			   __FUNCTION__, dev_priv->cp_mode );
		return 0;
	}

	radeon_do_cp_start( dev_priv );

	return 0;
}

/* Stop the CP.  The engine must have been idled before calling this
 * routine.
 */
int radeon_cp_stop( struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_cp_stop_t stop;
	int ret;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||
	     dev->lock.pid != current->pid ) {
		DRM_ERROR( "%s called without lock held\n", __FUNCTION__ );
		return -EINVAL;
	}

	if ( copy_from_user( &stop, (drm_radeon_init_t *)arg, sizeof(stop) ) )
		return -EFAULT;

	/* Flush any pending CP commands.  This ensures any outstanding
	 * commands are exectuted by the engine before we turn it off.
	 */
	if ( stop.flush ) {
		radeon_do_cp_flush( dev_priv );
	}

	/* If we fail to make the engine go idle, we return an error
	 * code so that the DRM ioctl wrapper can try again.
	 */
	if ( stop.idle ) {
		ret = radeon_do_cp_idle( dev_priv );
		if ( ret < 0 ) return ret;
	}

	/* Finally, we can turn off the CP.  If the engine isn't idle,
	 * we will get some dropped triangles as they won't be fully
	 * rendered before the CP is shut down.
	 */
	radeon_do_cp_stop( dev_priv );

	/* Reset the engine */
	radeon_do_engine_reset( dev );

	return 0;
}

/* Just reset the CP ring.  Called as part of an X Server engine reset.
 */
int radeon_cp_reset( struct inode *inode, struct file *filp,
		     unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||
	     dev->lock.pid != current->pid ) {
		DRM_ERROR( "%s called without lock held\n", __FUNCTION__ );
		return -EINVAL;
	}
	if ( !dev_priv ) {
		DRM_DEBUG( "%s called before init done\n", __FUNCTION__ );
		return -EINVAL;
	}

	radeon_do_cp_reset( dev_priv );

	/* The CP is no longer running after an engine reset */
	dev_priv->cp_running = 0;

	return 0;
}

int radeon_cp_idle( struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||
	     dev->lock.pid != current->pid ) {
		DRM_ERROR( "%s called without lock held\n", __FUNCTION__ );
		return -EINVAL;
	}

	return radeon_do_cp_idle( dev_priv );
}

int radeon_engine_reset( struct inode *inode, struct file *filp,
			 unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||
	     dev->lock.pid != current->pid ) {
		DRM_ERROR( "%s called without lock held\n", __FUNCTION__ );
		return -EINVAL;
	}

	return radeon_do_engine_reset( dev );
}


/* ================================================================
 * Fullscreen mode
 */

static int radeon_do_init_pageflip( drm_device_t *dev )
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	dev_priv->crtc_offset =      RADEON_READ( RADEON_CRTC_OFFSET );
	dev_priv->crtc_offset_cntl = RADEON_READ( RADEON_CRTC_OFFSET_CNTL );

	RADEON_WRITE( RADEON_CRTC_OFFSET, dev_priv->front_offset );
	RADEON_WRITE( RADEON_CRTC_OFFSET_CNTL,
		      dev_priv->crtc_offset_cntl |
		      RADEON_CRTC_OFFSET_FLIP_CNTL );

	dev_priv->page_flipping = 1;
	dev_priv->current_page = 0;

	return 0;
}

int radeon_do_cleanup_pageflip( drm_device_t *dev )
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	RADEON_WRITE( RADEON_CRTC_OFFSET,      dev_priv->crtc_offset );
	RADEON_WRITE( RADEON_CRTC_OFFSET_CNTL, dev_priv->crtc_offset_cntl );

	dev_priv->page_flipping = 0;
	dev_priv->current_page = 0;

	return 0;
}

int radeon_fullscreen( struct inode *inode, struct file *filp,
		       unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
	drm_radeon_fullscreen_t fs;

	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||
	     dev->lock.pid != current->pid ) {
		DRM_ERROR( "%s called without lock held\n", __FUNCTION__ );
		return -EINVAL;
	}

	if ( copy_from_user( &fs, (drm_radeon_fullscreen_t *)arg,
			     sizeof(fs) ) )
		return -EFAULT;

	switch ( fs.func ) {
	case RADEON_INIT_FULLSCREEN:
		return radeon_do_init_pageflip( dev );
	case RADEON_CLEANUP_FULLSCREEN:
		return radeon_do_cleanup_pageflip( dev );
	}

	return -EINVAL;
}


/* ================================================================
 * Freelist management
 */
#define RADEON_BUFFER_USED	0xffffffff
#define RADEON_BUFFER_FREE	0

#if 0
static int radeon_freelist_init( drm_device_t *dev )
{
	drm_device_dma_t *dma = dev->dma;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_buf_t *buf;
	drm_radeon_buf_priv_t *buf_priv;
	drm_radeon_freelist_t *entry;
	int i;

	dev_priv->head = drm_alloc( sizeof(drm_radeon_freelist_t),
				    DRM_MEM_DRIVER );
	if ( dev_priv->head == NULL )
		return -ENOMEM;

	memset( dev_priv->head, 0, sizeof(drm_radeon_freelist_t) );
	dev_priv->head->age = RADEON_BUFFER_USED;

	for ( i = 0 ; i < dma->buf_count ; i++ ) {
		buf = dma->buflist[i];
		buf_priv = buf->dev_private;

		entry = drm_alloc( sizeof(drm_radeon_freelist_t),
				   DRM_MEM_DRIVER );
		if ( !entry ) return -ENOMEM;

		entry->age = RADEON_BUFFER_FREE;
		entry->buf = buf;
		entry->prev = dev_priv->head;
		entry->next = dev_priv->head->next;
		if ( !entry->next )
			dev_priv->tail = entry;

		buf_priv->discard = 0;
		buf_priv->dispatched = 0;
		buf_priv->list_entry = entry;

		dev_priv->head->next = entry;

		if ( dev_priv->head->next )
			dev_priv->head->next->prev = entry;
	}

	return 0;

}
#endif

drm_buf_t *radeon_freelist_get( drm_device_t *dev )
{
	drm_device_dma_t *dma = dev->dma;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_buf_priv_t *buf_priv;
	drm_buf_t *buf;
	int i, t;
#if ROTATE_BUFS
	int start;
#endif

	/* FIXME: Optimize -- use freelist code */

	for ( i = 0 ; i < dma->buf_count ; i++ ) {
		buf = dma->buflist[i];
		buf_priv = buf->dev_private;
		if ( buf->pid == 0 ) {
			DRM_DEBUG( "  ret buf=%d last=%d pid=0\n",
				   buf->idx, dev_priv->last_buf );
			return buf;
		}
		DRM_DEBUG( "    skipping buf=%d pid=%d\n",
			   buf->idx, buf->pid );
	}

#if ROTATE_BUFS
	if ( ++dev_priv->last_buf >= dma->buf_count )
		dev_priv->last_buf = 0;
	start = dev_priv->last_buf;
#endif
	for ( t = 0 ; t < dev_priv->usec_timeout ; t++ ) {
#if 0
		/* FIXME: Disable this for now */
		u32 done_age = dev_priv->scratch[RADEON_LAST_DISPATCH];
#else
		u32 done_age = RADEON_READ( RADEON_LAST_DISPATCH_REG );
#endif
#if ROTATE_BUFS
		for ( i = start ; i < dma->buf_count ; i++ ) {
#else
		for ( i = 0 ; i < dma->buf_count ; i++ ) {
#endif
			buf = dma->buflist[i];
			buf_priv = buf->dev_private;
			if ( buf->pending && buf_priv->age <= done_age ) {
				/* The buffer has been processed, so it
				 * can now be used.
				 */
				buf->pending = 0;
				DRM_DEBUG( "  ret buf=%d last=%d age=%d done=%d\n", buf->idx, dev_priv->last_buf, buf_priv->age, done_age );
				return buf;
			}
			DRM_DEBUG( "    skipping buf=%d age=%d done=%d\n",
				   buf->idx, buf_priv->age,
				   done_age );
#if ROTATE_BUFS
			start = 0;
#endif
		}
		udelay( 1 );
	}

	DRM_ERROR( "returning NULL!\n" );
	return NULL;
}

void radeon_freelist_reset( drm_device_t *dev )
{
	drm_device_dma_t *dma = dev->dma;
#if ROTATE_BUFS
	drm_radeon_private_t *dev_priv = dev->dev_private;
#endif
	int i;

#if ROTATE_BUFS
	dev_priv->last_buf = 0;
#endif
	for ( i = 0 ; i < dma->buf_count ; i++ ) {
		drm_buf_t *buf = dma->buflist[i];
		drm_radeon_buf_priv_t *buf_priv = buf->dev_private;
		buf_priv->age = 0;
	}
}


/* ================================================================
 * CP command submission
 */

int radeon_wait_ring( drm_radeon_private_t *dev_priv, int n )
{
	drm_radeon_ring_buffer_t *ring = &dev_priv->ring;
	int i;

	for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
		ring->space = *ring->head - ring->tail;
		if ( ring->space <= 0 )
			ring->space += ring->size;

		if ( ring->space >= n )
			return 0;

		udelay( 1 );
	}

	/* FIXME: This return value is ignored in the BEGIN_RING macro! */
	DRM_ERROR( "failed!\n" );
	return -EBUSY;
}

void radeon_update_ring_snapshot( drm_radeon_private_t *dev_priv )
{
	drm_radeon_ring_buffer_t *ring = &dev_priv->ring;

	ring->space = *ring->head - ring->tail;
	if ( ring->space == 0 )
		atomic_inc( &dev_priv->idle_count );
	if ( ring->space <= 0 )
		ring->space += ring->size;
}

static int radeon_cp_get_buffers( drm_device_t *dev, drm_dma_t *d )
{
	int i;
	drm_buf_t *buf;

	for ( i = d->granted_count ; i < d->request_count ; i++ ) {
		buf = radeon_freelist_get( dev );
		if ( !buf ) return -EAGAIN;

		buf->pid = current->pid;

		if ( copy_to_user( &d->request_indices[i], &buf->idx,
				   sizeof(buf->idx) ) )
			return -EFAULT;
		if ( copy_to_user( &d->request_sizes[i], &buf->total,
				   sizeof(buf->total) ) )
			return -EFAULT;

		d->granted_count++;
	}
	return 0;
}

int radeon_cp_buffers( struct inode *inode, struct file *filp,
		       unsigned int cmd, unsigned long arg )
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	drm_device_dma_t *dma = dev->dma;
	int ret = 0;
	drm_dma_t d;

	if ( copy_from_user( &d, (drm_dma_t *) arg, sizeof(d) ) )
		return -EFAULT;

	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||
	     dev->lock.pid != current->pid ) {
		DRM_ERROR( "%s called without lock held\n", __FUNCTION__ );
		return -EINVAL;
	}

	/* Please don't send us buffers.
	 */
	if ( d.send_count != 0 ) {
		DRM_ERROR( "Process %d trying to send %d buffers via drmDMA\n",
			   current->pid, d.send_count );
		return -EINVAL;
	}

	/* We'll send you buffers.
	 */
	if ( d.request_count < 0 || d.request_count > dma->buf_count ) {
		DRM_ERROR( "Process %d trying to get %d buffers (of %d max)\n",
			   current->pid, d.request_count, dma->buf_count );
		return -EINVAL;
	}

	d.granted_count = 0;

	if ( d.request_count ) {
		ret = radeon_cp_get_buffers( dev, &d );
	}

	if ( copy_to_user( (drm_dma_t *) arg, &d, sizeof(d) ) )
		return -EFAULT;

	return ret;
}