#include <uapi/linux/dma-buf.h>
#include <uapi/linux/magic.h>
+#include "dma-buf-sysfs-stats.h"
+
static inline int is_dma_buf_file(struct file *);
struct dma_buf_list {
*/
BUG_ON(dmabuf->cb_shared.active || dmabuf->cb_excl.active);
+ dma_buf_stats_teardown(dmabuf);
dmabuf->ops->release(dmabuf);
if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
file->f_mode |= FMODE_LSEEK;
dmabuf->file = file;
+ ret = dma_buf_stats_setup(dmabuf);
+ if (ret)
+ goto err_sysfs;
+
mutex_init(&dmabuf->lock);
INIT_LIST_HEAD(&dmabuf->attachments);
return dmabuf;
+err_sysfs:
+ /*
+ * Set file->f_path.dentry->d_fsdata to NULL so that when
+ * dma_buf_release() gets invoked by dentry_ops, it exits
+ * early before calling the release() dma_buf op.
+ */
+ file->f_path.dentry->d_fsdata = NULL;
+ fput(file);
err_dmabuf:
kfree(dmabuf);
err_module:
* the underlying backing storage is pinned for as long as a mapping exists,
* therefore users/importers should not hold onto a mapping for undue amounts of
* time.
+ *
+ * Important: Dynamic importers must wait for the exclusive fence of the struct
+ * dma_resv attached to the DMA-BUF first.
*/
struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
enum dma_data_direction direction)
}
}
#endif /* CONFIG_DMA_API_DEBUG */
-
return sg_table;
}
EXPORT_SYMBOL_GPL(dma_buf_map_attachment);
static int __init dma_buf_init(void)
{
+ int ret;
+
+ ret = dma_buf_init_sysfs_statistics();
+ if (ret)
+ return ret;
+
dma_buf_mnt = kern_mount(&dma_buf_fs_type);
if (IS_ERR(dma_buf_mnt))
return PTR_ERR(dma_buf_mnt);
{
dma_buf_uninit_debugfs();
kern_unmount(dma_buf_mnt);
+ dma_buf_uninit_sysfs_statistics();
}
__exitcall(dma_buf_deinit);