i810_dma.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

			OUT_RING( start + used - 4 );
			OUT_RING( 0 );
			ADVANCE_LP_RING();

		} while (++i < nbox);
	}

	if (discard) {
		dev_priv->counter++;

		(void) cmpxchg(buf_priv->in_use, I810_BUF_CLIENT,
			       I810_BUF_HARDWARE);

		BEGIN_LP_RING(8);
		OUT_RING( CMD_STORE_DWORD_IDX );
		OUT_RING( 20 );
		OUT_RING( dev_priv->counter );
		OUT_RING( CMD_STORE_DWORD_IDX );
		OUT_RING( buf_priv->my_use_idx );
		OUT_RING( I810_BUF_FREE );
		OUT_RING( CMD_REPORT_HEAD );
		OUT_RING( 0 );
		ADVANCE_LP_RING();
	}
}


void i810_dma_quiescent(drm_device_t *dev)
{
      	drm_i810_private_t *dev_priv = dev->dev_private;
   	RING_LOCALS;

/*  	printk("%s\n", __FUNCTION__); */

  	i810_kernel_lost_context(dev);

   	BEGIN_LP_RING(4);
   	OUT_RING( INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE );
   	OUT_RING( CMD_REPORT_HEAD );
      	OUT_RING( 0 );
      	OUT_RING( 0 );
   	ADVANCE_LP_RING();

	i810_wait_ring( dev, dev_priv->ring.Size - 8 );
}

static int i810_flush_queue(drm_device_t *dev)
{
   	drm_i810_private_t *dev_priv = dev->dev_private;
	drm_device_dma_t *dma = dev->dma;
   	int i, ret = 0;
   	RING_LOCALS;
	
/*  	printk("%s\n", __FUNCTION__); */

   	i810_kernel_lost_context(dev);

   	BEGIN_LP_RING(2);
      	OUT_RING( CMD_REPORT_HEAD );
      	OUT_RING( 0 );
      	ADVANCE_LP_RING();

	i810_wait_ring( dev, dev_priv->ring.Size - 8 );

   	for (i = 0; i < dma->buf_count; i++) {
	   	drm_buf_t *buf = dma->buflist[ i ];
	   	drm_i810_buf_priv_t *buf_priv = buf->dev_private;

		int used = cmpxchg(buf_priv->in_use, I810_BUF_HARDWARE,
				   I810_BUF_FREE);

		if (used == I810_BUF_HARDWARE)
			DRM_DEBUG("reclaimed from HARDWARE\n");
		if (used == I810_BUF_CLIENT)
			DRM_DEBUG("still on client\n");
	}

   	return ret;
}

/* Must be called with the lock held */
void i810_reclaim_buffers(drm_device_t *dev, pid_t pid)
{
	drm_device_dma_t *dma = dev->dma;
	int		 i;

	if (!dma) return;
      	if (!dev->dev_private) return;
	if (!dma->buflist) return;

        i810_flush_queue(dev);

	for (i = 0; i < dma->buf_count; i++) {
	   	drm_buf_t *buf = dma->buflist[ i ];
	   	drm_i810_buf_priv_t *buf_priv = buf->dev_private;

		if (buf->pid == pid && buf_priv) {
			int used = cmpxchg(buf_priv->in_use, I810_BUF_CLIENT,
					   I810_BUF_FREE);

			if (used == I810_BUF_CLIENT)
				DRM_DEBUG("reclaimed from client\n");
		   	if(buf_priv->currently_mapped == I810_BUF_MAPPED)
		     		buf_priv->currently_mapped = I810_BUF_UNMAPPED;
		}
	}
}

int i810_flush_ioctl(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;

   	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_flush_ioctl called without lock held\n");
		return -EINVAL;
	}

   	i810_flush_queue(dev);
   	return 0;
}


int i810_dma_vertex(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;
      	u32 *hw_status = (u32 *)dev_priv->hw_status_page;
   	drm_i810_sarea_t *sarea_priv = (drm_i810_sarea_t *)
     					dev_priv->sarea_priv;
	drm_i810_vertex_t vertex;

	if (copy_from_user(&vertex, (drm_i810_vertex_t *)arg, sizeof(vertex)))
		return -EFAULT;

   	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_dma_vertex called without lock held\n");
		return -EINVAL;
	}

	if(vertex.idx < 0 || vertex.idx > dma->buf_count) return -EINVAL;

	i810_dma_dispatch_vertex( dev,
				  dma->buflist[ vertex.idx ],
				  vertex.discard, vertex.used );

   	atomic_add(vertex.used, &dev->counts[_DRM_STAT_SECONDARY]);
	atomic_inc(&dev->counts[_DRM_STAT_DMA]);
	sarea_priv->last_enqueue = dev_priv->counter-1;
   	sarea_priv->last_dispatch = (int) hw_status[5];

	return 0;
}



int i810_clear_bufs(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_i810_clear_t clear;

   	if (copy_from_user(&clear, (drm_i810_clear_t *)arg, sizeof(clear)))
		return -EFAULT;

   	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_clear_bufs called without lock held\n");
		return -EINVAL;
	}

 	/* GH: Someone's doing nasty things... */
 	if (!dev->dev_private) {
 		return -EINVAL;
 	}

	i810_dma_dispatch_clear( dev, clear.flags,
				 clear.clear_color,
				 clear.clear_depth );
   	return 0;
}

int i810_swap_bufs(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;

   	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_swap_buf called without lock held\n");
		return -EINVAL;
	}

	i810_dma_dispatch_swap( dev );
   	return 0;
}

int i810_getage(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;
      	u32 *hw_status = (u32 *)dev_priv->hw_status_page;
   	drm_i810_sarea_t *sarea_priv = (drm_i810_sarea_t *)
     					dev_priv->sarea_priv;

      	sarea_priv->last_dispatch = (int) hw_status[5];
	return 0;
}

int i810_getbuf(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;
	int		  retcode   = 0;
	drm_i810_dma_t	  d;
   	drm_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;
   	u32 *hw_status = (u32 *)dev_priv->hw_status_page;
   	drm_i810_sarea_t *sarea_priv = (drm_i810_sarea_t *)
     					dev_priv->sarea_priv;

   	if (copy_from_user(&d, (drm_i810_dma_t *)arg, sizeof(d)))
		return -EFAULT;

	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_dma called without lock held\n");
		return -EINVAL;
	}

	d.granted = 0;

	retcode = i810_dma_get_buffer(dev, &d, filp);

	if (copy_to_user((drm_dma_t *)arg, &d, sizeof(d)))
		return -EFAULT;
   	sarea_priv->last_dispatch = (int) hw_status[5];

	return retcode;
}

int i810_copybuf(struct inode *inode,
		 struct file *filp, 
		 unsigned int cmd,
		 unsigned long arg)
{
	/* Never copy - 2.4.x doesn't need it */
	return 0;
}

int i810_docopy(struct inode *inode, struct file *filp, unsigned int cmd,
		unsigned long arg)
{
	/* Never copy - 2.4.x doesn't need it */
	return 0;
}

static void i810_dma_dispatch_mc(drm_device_t *dev, drm_buf_t *buf, int used,
		unsigned int last_render)
{
	drm_i810_private_t *dev_priv = dev->dev_private;
	drm_i810_buf_priv_t *buf_priv = buf->dev_private;
	drm_i810_sarea_t *sarea_priv = dev_priv->sarea_priv;
	unsigned long address = (unsigned long)buf->bus_address;
	unsigned long start = address - dev->agp->base;
	int u;
	RING_LOCALS;

	i810_kernel_lost_context(dev);

	u = cmpxchg(buf_priv->in_use, I810_BUF_CLIENT,
		I810_BUF_HARDWARE);
	if(u != I810_BUF_CLIENT) {
		DRM_DEBUG("MC found buffer that isn't mine!\n");
	}

	if (used > 4*1024)
		used = 0;

	sarea_priv->dirty = 0x7f;

	DRM_DEBUG("dispatch mc addr 0x%lx, used 0x%x\n",
		address, used);

	dev_priv->counter++;
	DRM_DEBUG("dispatch counter : %ld\n", dev_priv->counter);
	DRM_DEBUG("i810_dma_dispatch_mc\n");
	DRM_DEBUG("start : %lx\n", start);
	DRM_DEBUG("used : %d\n", used);
	DRM_DEBUG("start + used - 4 : %ld\n", start + used - 4);

	if (buf_priv->currently_mapped == I810_BUF_MAPPED) {
		if (used & 4) {
			*(u32 *)((u32)buf_priv->virtual + used) = 0;
			used += 4;
		}

		i810_unmap_buffer(buf);
	}
	BEGIN_LP_RING(4);
	OUT_RING( CMD_OP_BATCH_BUFFER );
	OUT_RING( start | BB1_PROTECTED );
	OUT_RING( start + used - 4 );
	OUT_RING( 0 );
	ADVANCE_LP_RING();


	BEGIN_LP_RING(8);
	OUT_RING( CMD_STORE_DWORD_IDX );
	OUT_RING( buf_priv->my_use_idx );
	OUT_RING( I810_BUF_FREE );
	OUT_RING( 0 );

	OUT_RING( CMD_STORE_DWORD_IDX );
	OUT_RING( 16 );
	OUT_RING( last_render );
	OUT_RING( 0 );
	ADVANCE_LP_RING();
}

int i810_dma_mc(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;
	u32 *hw_status = (u32 *)dev_priv->hw_status_page;
	drm_i810_sarea_t *sarea_priv = (drm_i810_sarea_t *)
		dev_priv->sarea_priv;
	drm_i810_mc_t mc;

	if (copy_from_user(&mc, (drm_i810_mc_t *)arg, sizeof(mc)))
		return -EFAULT;


	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_dma_mc called without lock held\n");
		return -EINVAL;
	}

	i810_dma_dispatch_mc(dev, dma->buflist[mc.idx], mc.used,
		mc.last_render );

	atomic_add(mc.used, &dev->counts[_DRM_STAT_SECONDARY]);
	atomic_inc(&dev->counts[_DRM_STAT_DMA]);
	sarea_priv->last_enqueue = dev_priv->counter-1;
	sarea_priv->last_dispatch = (int) hw_status[5];

	return 0;
}

int i810_rstatus(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;

	return (int)(((u32 *)(dev_priv->hw_status_page))[4]);
}

int i810_ov0_info(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;
	drm_i810_overlay_t data;

	data.offset = dev_priv->overlay_offset;
	data.physical = dev_priv->overlay_physical;
	if (copy_to_user((drm_i810_overlay_t *)arg,&data,sizeof(data)))
		return -EFAULT;
	return 0;
}

int i810_fstatus(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;

	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_fstatus called without lock held\n");
		return -EINVAL;
	}
	return I810_READ(0x30008);
}

int i810_ov0_flip(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_i810_private_t *dev_priv = (drm_i810_private_t *)dev->dev_private;

	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
		DRM_ERROR("i810_ov0_flip called without lock held\n");
		return -EINVAL;
	}

	//Tell the overlay to update
	I810_WRITE(0x30000,dev_priv->overlay_physical | 0x80000000);

	return 0;
}