mga_dma.c

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

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

int mga_freelist_put( drm_device_t *dev, drm_buf_t *buf )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_buf_priv_t *buf_priv = buf->dev_private;
	drm_mga_freelist_t *head, *entry, *prev;

	DRM_DEBUG( "%s: age=0x%06lx wrap=%d\n",
		   __FUNCTION__,
		   buf_priv->list_entry->age.head -
		   dev_priv->primary->offset,
		   buf_priv->list_entry->age.wrap );

	entry = buf_priv->list_entry;
	head = dev_priv->head;

	if ( buf_priv->list_entry->age.head == MGA_BUFFER_USED ) {
		SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
		prev = dev_priv->tail;
		prev->next = entry;
		entry->prev = prev;
		entry->next = NULL;
	} else {
		prev = head->next;
		head->next = entry;
		prev->prev = entry;
		entry->prev = head;
		entry->next = prev;
	}

	return 0;
}


/* ================================================================
 * DMA initialization, cleanup
 */

static int mga_do_init_dma( drm_device_t *dev, drm_mga_init_t *init )
{
	drm_mga_private_t *dev_priv;
	struct list_head *list;
	int ret;
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	dev_priv = DRM(alloc)( sizeof(drm_mga_private_t), DRM_MEM_DRIVER );
	if ( !dev_priv )
		return -ENOMEM;

	memset( dev_priv, 0, sizeof(drm_mga_private_t) );

	dev_priv->chipset = init->chipset;

	dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;

	if ( init->sgram ) {
		dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
	} else {
		dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
	}
	dev_priv->maccess	= init->maccess;

	dev_priv->fb_cpp	= init->fb_cpp;
	dev_priv->front_offset	= init->front_offset;
	dev_priv->front_pitch	= init->front_pitch;
	dev_priv->back_offset	= init->back_offset;
	dev_priv->back_pitch	= init->back_pitch;

	dev_priv->depth_cpp	= init->depth_cpp;
	dev_priv->depth_offset	= init->depth_offset;
	dev_priv->depth_pitch	= init->depth_pitch;

	/* FIXME: Need to support AGP textures...
	 */
	dev_priv->texture_offset = init->texture_offset[0];
	dev_priv->texture_size = init->texture_size[0];

	list_for_each( list, &dev->maplist->head ) {
		drm_map_list_t *entry = (drm_map_list_t *)list;
		if ( entry->map &&
		     entry->map->type == _DRM_SHM &&
		     (entry->map->flags & _DRM_CONTAINS_LOCK) ) {
			dev_priv->sarea = entry->map;
 			break;
 		}
 	}
	if(!dev_priv->sarea) {
		DRM_ERROR( "failed to find sarea!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}

	DRM_FIND_MAP( dev_priv->fb, init->fb_offset );
	if(!dev_priv->fb) {
		DRM_ERROR( "failed to find framebuffer!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}
	DRM_FIND_MAP( dev_priv->mmio, init->mmio_offset );
	if(!dev_priv->mmio) {
		DRM_ERROR( "failed to find mmio region!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}
	DRM_FIND_MAP( dev_priv->status, init->status_offset );
	if(!dev_priv->status) {
		DRM_ERROR( "failed to find status page!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}

	DRM_FIND_MAP( dev_priv->warp, init->warp_offset );
	if(!dev_priv->warp) {
		DRM_ERROR( "failed to find warp microcode region!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}
	DRM_FIND_MAP( dev_priv->primary, init->primary_offset );
	if(!dev_priv->primary) {
		DRM_ERROR( "failed to find primary dma region!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}
	DRM_FIND_MAP( dev_priv->buffers, init->buffers_offset );
	if(!dev_priv->buffers) {
		DRM_ERROR( "failed to find dma buffer region!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -EINVAL;
	}

	dev_priv->sarea_priv =
		(drm_mga_sarea_t *)((u8 *)dev_priv->sarea->handle +
				    init->sarea_priv_offset);

	DRM_IOREMAP( dev_priv->warp );
	DRM_IOREMAP( dev_priv->primary );
	DRM_IOREMAP( dev_priv->buffers );

	if(!dev_priv->warp->handle ||
	   !dev_priv->primary->handle ||
	   !dev_priv->buffers->handle ) {
		DRM_ERROR( "failed to ioremap agp regions!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -ENOMEM;
	}

	ret = mga_warp_install_microcode( dev_priv );
	if ( ret < 0 ) {
		DRM_ERROR( "failed to install WARP ucode!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return ret;
	}

	ret = mga_warp_init( dev_priv );
	if ( ret < 0 ) {
		DRM_ERROR( "failed to init WARP engine!\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return ret;
	}

	dev_priv->prim.status = (u32 *)dev_priv->status->handle;

	mga_do_wait_for_idle( dev_priv );

	/* Init the primary DMA registers.
	 */
	MGA_WRITE( MGA_PRIMADDRESS,
		   dev_priv->primary->offset | MGA_DMA_GENERAL );
#if 0
	MGA_WRITE( MGA_PRIMPTR,
		   virt_to_bus((void *)dev_priv->prim.status) |
		   MGA_PRIMPTREN0 |	/* Soft trap, SECEND, SETUPEND */
		   MGA_PRIMPTREN1 );	/* DWGSYNC */
#endif

	dev_priv->prim.start = (u8 *)dev_priv->primary->handle;
	dev_priv->prim.end = ((u8 *)dev_priv->primary->handle
			      + dev_priv->primary->size);
	dev_priv->prim.size = dev_priv->primary->size;

	dev_priv->prim.tail = 0;
	dev_priv->prim.space = dev_priv->prim.size;
	dev_priv->prim.wrapped = 0;

	dev_priv->prim.last_flush = 0;
	dev_priv->prim.last_wrap = 0;

	dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;

	spin_lock_init( &dev_priv->prim.list_lock );

	dev_priv->prim.status[0] = dev_priv->primary->offset;
	dev_priv->prim.status[1] = 0;

	dev_priv->sarea_priv->last_wrap = 0;
	dev_priv->sarea_priv->last_frame.head = 0;
	dev_priv->sarea_priv->last_frame.wrap = 0;

	if ( mga_freelist_init( dev, dev_priv ) < 0 ) {
		DRM_ERROR( "could not initialize freelist\n" );
		/* Assign dev_private so we can do cleanup. */
		dev->dev_private = (void *)dev_priv;
		mga_do_cleanup_dma( dev );
		return -ENOMEM;
	}

	/* Make dev_private visable to others. */
	dev->dev_private = (void *)dev_priv;
	return 0;
}

int mga_do_cleanup_dma( drm_device_t *dev )
{
	DRM_DEBUG( "%s\n", __FUNCTION__ );

	if ( dev->dev_private ) {
		drm_mga_private_t *dev_priv = dev->dev_private;

		DRM_IOREMAPFREE( dev_priv->warp );
		DRM_IOREMAPFREE( dev_priv->primary );
		DRM_IOREMAPFREE( dev_priv->buffers );

		if ( dev_priv->head != NULL ) {
			mga_freelist_cleanup( dev );
		}

		DRM(free)( dev->dev_private, sizeof(drm_mga_private_t),
			   DRM_MEM_DRIVER );
		dev->dev_private = NULL;
	}

	return 0;
}

int mga_dma_init( 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_mga_init_t init;

	if ( copy_from_user( &init, (drm_mga_init_t *)arg, sizeof(init) ) )
		return -EFAULT;

	switch ( init.func ) {
	case MGA_INIT_DMA:
		return mga_do_init_dma( dev, &init );
	case MGA_CLEANUP_DMA:
		return mga_do_cleanup_dma( dev );
	}

	return -EINVAL;
}


/* ================================================================
 * Primary DMA stream management
 */

int mga_dma_flush( 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_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
	drm_lock_t lock;

	LOCK_TEST_WITH_RETURN( dev );

	if ( copy_from_user( &lock, (drm_lock_t *)arg, sizeof(lock) ) )
		return -EFAULT;

	DRM_DEBUG( "%s: %s%s%s\n",
		   __FUNCTION__,
		   (lock.flags & _DRM_LOCK_FLUSH) ?	"flush, " : "",
		   (lock.flags & _DRM_LOCK_FLUSH_ALL) ?	"flush all, " : "",
		   (lock.flags & _DRM_LOCK_QUIESCENT) ?	"idle, " : "" );

	WRAP_WAIT_WITH_RETURN( dev_priv );

	if ( lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL) ) {
		mga_do_dma_flush( dev_priv );
	}

	if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
#if MGA_DMA_DEBUG
		int ret = mga_do_wait_for_idle( dev_priv );
		if ( ret < 0 )
			DRM_INFO( __FUNCTION__": -EBUSY\n" );
		return ret;
#else
		return mga_do_wait_for_idle( dev_priv );
#endif
	} else {
		return 0;
	}
}

int mga_dma_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_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;

	LOCK_TEST_WITH_RETURN( dev );

	return mga_do_dma_reset( dev_priv );
}


/* ================================================================
 * DMA buffer management
 */

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

	for ( i = d->granted_count ; i < d->request_count ; i++ ) {
		buf = mga_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 mga_dma_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;
	drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
	drm_dma_t d;
	int ret = 0;

	LOCK_TEST_WITH_RETURN( dev );

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

	/* 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;
	}

	WRAP_TEST_WITH_RETURN( dev_priv );

	d.granted_count = 0;

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

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

	return ret;
}