drm_bufs.h

来自「优龙2410linux2.6.8内核源代码」· C头文件 代码 · 共 1,305 行 · 第 1/3 页

		buf->total   = alignment;
		buf->order   = order;
		buf->used    = 0;

		buf->offset  = (dma->byte_count + offset);
		buf->bus_address = agp_offset + offset;
		buf->address = (void *)(agp_offset + offset + dev->sg->handle);
		buf->next    = NULL;
		buf->waiting = 0;
		buf->pending = 0;
		init_waitqueue_head( &buf->dma_wait );
		buf->filp    = NULL;

		buf->dev_priv_size = sizeof(DRIVER_BUF_PRIV_T);
		buf->dev_private = DRM(alloc)( sizeof(DRIVER_BUF_PRIV_T),
					       DRM_MEM_BUFS );
		if(!buf->dev_private) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			DRM(cleanup_buf_error)(entry);
			up( &dev->struct_sem );
			atomic_dec( &dev->buf_alloc );
			return -ENOMEM;
		}

		memset( buf->dev_private, 0, buf->dev_priv_size );

		DRM_DEBUG( "buffer %d @ %p\n",
			   entry->buf_count, buf->address );

		offset += alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}

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

	temp_buflist = DRM(realloc)( dma->buflist,
				     dma->buf_count * sizeof(*dma->buflist),
				     (dma->buf_count + entry->buf_count)
				     * sizeof(*dma->buflist),
				     DRM_MEM_BUFS );
	if(!temp_buflist) {
		/* Free the entry because it isn't valid */
		DRM(cleanup_buf_error)(entry);
		up( &dev->struct_sem );
		atomic_dec( &dev->buf_alloc );
		return -ENOMEM;
	}
	dma->buflist = temp_buflist;

	for ( i = 0 ; i < entry->buf_count ; i++ ) {
		dma->buflist[i + dma->buf_count] = &entry->buflist[i];
	}

	dma->buf_count += entry->buf_count;
	dma->byte_count += byte_count;

	DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
	DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );

#if __HAVE_DMA_FREELIST
	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] );
	}
#endif
	up( &dev->struct_sem );

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

	if ( copy_to_user( argp, &request, sizeof(request) ) )
		return -EFAULT;

	dma->flags = _DRM_DMA_USE_SG;

	atomic_dec( &dev->buf_alloc );
	return 0;
}
#endif /* __HAVE_SG */

/**
 * Add buffers for DMA transfers (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_desc_t request.
 * \return zero on success or a negative number on failure.
 *
 * According with the memory type specified in drm_buf_desc::flags and the
 * build options, it dispatches the call either to addbufs_agp(),
 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
 * PCI memory respectively.
 */
int DRM(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 __user *)arg,
			     sizeof(request) ) )
		return -EFAULT;

#if __REALLY_HAVE_AGP
	if ( request.flags & _DRM_AGP_BUFFER )
		return DRM(addbufs_agp)( inode, filp, cmd, arg );
	else
#endif
#if __HAVE_SG
	if ( request.flags & _DRM_SG_BUFFER )
		return DRM(addbufs_sg)( inode, filp, cmd, arg );
	else
#endif
#if __HAVE_PCI_DMA
		return DRM(addbufs_pci)( inode, filp, cmd, arg );
#else
		return -EINVAL;
#endif
}


/**
 * Get information about the buffer mappings.
 *
 * This was originally mean for debugging purposes, or by a sophisticated
 * client library to determine how best to use the available buffers (e.g.,
 * large buffers can be used for image transfer).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_info structure.
 * \return zero on success or a negative number on failure.
 *
 * Increments drm_device::buf_use while holding the drm_device::count_lock
 * lock, preventing of allocating more buffers after this call. Information
 * about each requested buffer is then copied into user space.
 */
int DRM(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;
	drm_buf_info_t __user *argp = (void __user *)arg;
	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, argp, sizeof(request) ) )
		return -EFAULT;

	for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
		if ( dma->bufs[i].buf_count ) ++count;
	}

	DRM_DEBUG( "count = %d\n", count );

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

				DRM_DEBUG( "%d %d %d %d %d\n",
					   i,
					   dma->bufs[i].buf_count,
					   dma->bufs[i].buf_size,
					   dma->bufs[i].freelist.low_mark,
					   dma->bufs[i].freelist.high_mark );
				++count;
			}
		}
	}
	request.count = count;

	if ( copy_to_user( argp, &request, sizeof(request) ) )
		return -EFAULT;

	return 0;
}

/**
 * Specifies a low and high water mark for buffer allocation
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg a pointer to a drm_buf_desc structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies that the size order is bounded between the admissible orders and
 * updates the respective drm_device_dma::bufs entry low and high water mark.
 *
 * \note This ioctl is deprecated and mostly never used.
 */
int DRM(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 __user *)arg,
			     sizeof(request) ) )
		return -EFAULT;

	DRM_DEBUG( "%d, %d, %d\n",
		   request.size, request.low_mark, request.high_mark );
	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;
}

/**
 * Unreserve the buffers in list, previously reserved using drmDMA. 
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_free structure.
 * \return zero on success or a negative number on failure.
 * 
 * Calls free_buffer() for each used buffer.
 * This function is primarily used for debugging.
 */
int DRM(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 __user *)arg,
			     sizeof(request) ) )
		return -EFAULT;

	DRM_DEBUG( "%d\n", request.count );
	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->filp != filp ) {
			DRM_ERROR( "Process %d freeing buffer not owned\n",
				   current->pid );
			return -EINVAL;
		}
		DRM(free_buffer)( dev, buf );
	}

	return 0;
}

/**
 * Maps all of the DMA buffers into client-virtual space (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_buf_map structure.
 * \return zero on success or a negative number on failure.
 *
 * Maps the AGP or SG buffer region with do_mmap(), and copies information
 * about each buffer into user space. The PCI buffers are already mapped on the
 * addbufs_pci() call.
 */
int DRM(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;
	drm_buf_map_t __user *argp = (void __user *)arg;
	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, argp, sizeof(request) ) )
		return -EFAULT;

	if ( request.count >= dma->buf_count ) {
		if ( (__HAVE_AGP && (dma->flags & _DRM_DMA_USE_AGP)) ||
		     (__HAVE_SG && (dma->flags & _DRM_DMA_USE_SG)) ) {
			drm_map_t *map = DRIVER_AGP_BUFFERS_MAP( dev );

			if ( !map ) {
				retcode = -EINVAL;
				goto done;
			}

#if LINUX_VERSION_CODE <= 0x020402
			down( &current->mm->mmap_sem );
#else
			down_write( &current->mm->mmap_sem );
#endif
			virtual = do_mmap( filp, 0, map->size,
					   PROT_READ | PROT_WRITE,
					   MAP_SHARED,
					   (unsigned long)map->offset );
#if LINUX_VERSION_CODE <= 0x020402
			up( &current->mm->mmap_sem );
#else
			up_write( &current->mm->mmap_sem );
#endif
		} else {
#if LINUX_VERSION_CODE <= 0x020402
			down( &current->mm->mmap_sem );
#else
			down_write( &current->mm->mmap_sem );
#endif
			virtual = do_mmap( filp, 0, dma->byte_count,
					   PROT_READ | PROT_WRITE,
					   MAP_SHARED, 0 );
#if LINUX_VERSION_CODE <= 0x020402
			up( &current->mm->mmap_sem );
#else
			up_write( &current->mm->mmap_sem );
#endif
		}
		if ( virtual > -1024UL ) {
			/* Real error */
			retcode = (signed long)virtual;
			goto done;
		}
		request.virtual = (void __user *)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( argp, &request, sizeof(request) ) )
		return -EFAULT;

	return retcode;
}

#endif /* __HAVE_DMA */