mga_bufs.c

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

		     offset += alignment, ++entry->buf_count) {
			buf	     = &entry->buflist[entry->buf_count];
			buf->idx     = dma->buf_count + entry->buf_count;
			buf->total   = alignment;
			buf->order   = order;
			buf->used    = 0;
			buf->offset  = (dma->byte_count + byte_count + offset);
			buf->address = (void *)(page + offset);
			buf->next    = NULL;
			buf->waiting = 0;
			buf->pending = 0;
			init_waitqueue_head(&buf->dma_wait);
			buf->pid     = 0;
#if DRM_DMA_HISTOGRAM
			buf->time_queued     = 0;
			buf->time_dispatched = 0;
			buf->time_completed  = 0;
			buf->time_freed	     = 0;
#endif
			DRM_DEBUG("buffer %d @ %p\n",
				  entry->buf_count, buf->address);
		}
		byte_count += PAGE_SIZE << page_order;
	}

	dma->buflist = drm_realloc(dma->buflist,
				   dma->buf_count * sizeof(*dma->buflist),
				   (dma->buf_count + entry->buf_count)
				   * sizeof(*dma->buflist),
				   DRM_MEM_BUFS);
	for (i = dma->buf_count; i < dma->buf_count + entry->buf_count; i++)
		dma->buflist[i] = &entry->buflist[i - dma->buf_count];

	dma->buf_count	+= entry->buf_count;
	dma->seg_count	+= entry->seg_count;
	dma->page_count += entry->seg_count << page_order;
	dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
	
	drm_freelist_create(&entry->freelist, entry->buf_count);
	for (i = 0; i < entry->buf_count; i++) {
		drm_freelist_put(dev, &entry->freelist, &entry->buflist[i]);
	}
	
	up(&dev->struct_sem);

	request.count = entry->buf_count;
	request.size  = size;

	if (copy_to_user((drm_buf_desc_t *)arg,
			 &request,
			 sizeof(request)))
		return -EFAULT;
	
	atomic_dec(&dev->buf_alloc);
	return 0;
}

int mga_addbufs(struct inode *inode, struct file *filp, unsigned int cmd,
		unsigned long arg)
{
	drm_buf_desc_t	 request;

	if (copy_from_user(&request,
			   (drm_buf_desc_t *)arg,
			   sizeof(request)))
		return -EFAULT;

	if(request.flags & _DRM_AGP_BUFFER)
		return mga_addbufs_agp(inode, filp, cmd, arg);
	else
		return mga_addbufs_pci(inode, filp, cmd, arg);
}

int mga_infobufs(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_buf_info_t	 request;
	int		 i;
	int		 count;

	if (!dma) return -EINVAL;

	spin_lock(&dev->count_lock);
	if (atomic_read(&dev->buf_alloc)) {
		spin_unlock(&dev->count_lock);
		return -EBUSY;
	}
	++dev->buf_use;		/* Can't allocate more after this call */
	spin_unlock(&dev->count_lock);

	if (copy_from_user(&request,
			   (drm_buf_info_t *)arg,
			   sizeof(request)))
		return -EFAULT;

	for (i = 0, count = 0; i < DRM_MAX_ORDER+1; i++) {
		if (dma->bufs[i].buf_count) ++count;
	}
	
	if (request.count >= count) {
		for (i = 0, count = 0; i < DRM_MAX_ORDER+1; i++) {
			if (dma->bufs[i].buf_count) {
				if (copy_to_user(&request.list[count].count,
						 &dma->bufs[i].buf_count,
						 sizeof(dma->bufs[0]
							.buf_count)) ||
				    copy_to_user(&request.list[count].size,
						 &dma->bufs[i].buf_size,
						 sizeof(dma->bufs[0].buf_size)) ||
				    copy_to_user(&request.list[count].low_mark,
						 &dma->bufs[i]
						 .freelist.low_mark,
						 sizeof(dma->bufs[0]
							.freelist.low_mark)) ||
				    copy_to_user(&request.list[count]
						 .high_mark,
						 &dma->bufs[i]
						 .freelist.high_mark,
						 sizeof(dma->bufs[0]
							.freelist.high_mark)))
					return -EFAULT;
				++count;
			}
		}
	}
	request.count = count;

	if (copy_to_user((drm_buf_info_t *)arg,
			 &request,
			 sizeof(request)))
		return -EFAULT;
	
	return 0;
}

int mga_markbufs(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_buf_desc_t	 request;
	int		 order;
	drm_buf_entry_t	 *entry;

	if (!dma) return -EINVAL;

	if (copy_from_user(&request, (drm_buf_desc_t *)arg, sizeof(request)))
		return -EFAULT;

	order = drm_order(request.size);
	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
	entry = &dma->bufs[order];

	if (request.low_mark < 0 || request.low_mark > entry->buf_count)
		return -EINVAL;
	if (request.high_mark < 0 || request.high_mark > entry->buf_count)
		return -EINVAL;

	entry->freelist.low_mark  = request.low_mark;
	entry->freelist.high_mark = request.high_mark;
	
	return 0;
}

int mga_freebufs(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_buf_free_t	 request;
	int		 i;
	int		 idx;
	drm_buf_t	 *buf;

	if (!dma) return -EINVAL;

	if (copy_from_user(&request,
			   (drm_buf_free_t *)arg,
			   sizeof(request)))
		return -EFAULT;

	for (i = 0; i < request.count; i++) {
		if (copy_from_user(&idx,
				   &request.list[i],
				   sizeof(idx)))
			return -EFAULT;
		if (idx < 0 || idx >= dma->buf_count) {
			DRM_ERROR("Index %d (of %d max)\n",
				  idx, dma->buf_count - 1);
			return -EINVAL;
		}
		buf = dma->buflist[idx];
		if (buf->pid != current->pid) {
			DRM_ERROR("Process %d freeing buffer owned by %d\n",
				  current->pid, buf->pid);
			return -EINVAL;
		}
		drm_free_buffer(dev, buf);
	}
	
	return 0;
}

int mga_mapbufs(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		 retcode = 0;
	const int	 zero	 = 0;
	unsigned long	 virtual;
	unsigned long	 address;
	drm_buf_map_t	 request;
	int		 i;

	if (!dma) return -EINVAL;
	
	spin_lock(&dev->count_lock);
	if (atomic_read(&dev->buf_alloc)) {
		spin_unlock(&dev->count_lock);
		return -EBUSY;
	}
	++dev->buf_use;		/* Can't allocate more after this call */
	spin_unlock(&dev->count_lock);

	if (copy_from_user(&request,
			   (drm_buf_map_t *)arg,
			   sizeof(request)))
		return -EFAULT;

	if (request.count >= dma->buf_count) {
		if(dma->flags & _DRM_DMA_USE_AGP) {
			drm_mga_private_t *dev_priv = dev->dev_private;
			drm_map_t *map = NULL;
	 
			map = dev->maplist[dev_priv->buffer_map_idx];
			if (!map) {
				retcode = -EINVAL;
				goto done;
			}

			DRM_DEBUG("map->offset : %lx\n", map->offset);
			DRM_DEBUG("map->size : %lx\n", map->size);
			DRM_DEBUG("map->type : %d\n", map->type);
			DRM_DEBUG("map->flags : %x\n", map->flags);
			DRM_DEBUG("map->handle : %p\n", map->handle);
			DRM_DEBUG("map->mtrr : %d\n", map->mtrr);
			down_write(&current->mm->mmap_sem);
			virtual = do_mmap(filp, 0, map->size, 
					  PROT_READ|PROT_WRITE,
					  MAP_SHARED, 
					  (unsigned long)map->offset);
			up_write(&current->mm->mmap_sem);
		} else {
			down_write(&current->mm->mmap_sem);
			virtual = do_mmap(filp, 0, dma->byte_count,
					  PROT_READ|PROT_WRITE, MAP_SHARED, 0);
			up_write(&current->mm->mmap_sem);
		}
		if (virtual > -1024UL) {
			/* Real error */
			DRM_DEBUG("mmap error\n");
			retcode = (signed long)virtual;
			goto done;
		}
		request.virtual = (void *)virtual;
      
		for (i = 0; i < dma->buf_count; i++) {
			if (copy_to_user(&request.list[i].idx,
					 &dma->buflist[i]->idx,
					 sizeof(request.list[0].idx))) {
				retcode = -EFAULT;
				goto done;
			}
			if (copy_to_user(&request.list[i].total,
					 &dma->buflist[i]->total,
					 sizeof(request.list[0].total))) {
				retcode = -EFAULT;
				goto done;
			}
			if (copy_to_user(&request.list[i].used,
					 &zero,
					 sizeof(zero))) {
				retcode = -EFAULT;
				goto done;
			}
			address = virtual + dma->buflist[i]->offset;
			if (copy_to_user(&request.list[i].address,
					 &address,
					 sizeof(address))) {
				retcode = -EFAULT;
				goto done;
			}
		}
	}
 done:
	request.count = dma->buf_count;
	DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
   
	if (copy_to_user((drm_buf_map_t *)arg,
			 &request,
			 sizeof(request)))
		return -EFAULT;

	DRM_DEBUG("retcode : %d\n", retcode);

	return retcode;
}