STRUCT DMA_BUF(9)                 Device drivers infrastructure                 STRUCT DMA_BUF(9)



NAME
       struct_dma_buf - shared buffer object

SYNOPSIS
       struct dma_buf {
         size_t size;
         struct file * file;
         struct list_head attachments;
         const struct dma_buf_ops * ops;
         struct mutex lock;
         unsigned vmapping_counter;
         void * vmap_ptr;
         const char * exp_name;
         struct module * owner;
         struct list_head list_node;
         void * priv;
         struct reservation_object * resv;
         wait_queue_head_t poll;
         struct dma_buf_poll_cb_t cb_excl;
         struct dma_buf_poll_cb_t cb_shared;
       };

MEMBERS
       size
           size of the buffer

       file
           file pointer used for sharing buffers across, and for refcounting.

       attachments
           list of dma_buf_attachment that denotes all devices attached.

       ops
           dma_buf_ops associated with this buffer object.

       lock
           used internally to serialize list manipulation, attach/detach and vmap/unmap

       vmapping_counter
           used internally to refcnt the vmaps

       vmap_ptr
           the current vmap ptr if vmapping_counter > 0

       exp_name
           name of the exporter; useful for debugging.

       owner
           pointer to exporter module; used for refcounting when exporter is a kernel module.

       list_node
           node for dma_buf accounting and debugging.

       priv
           exporter specific private data for this buffer object.

       resv
           reservation object linked to this dma-buf

       poll
           for userspace poll support

       cb_excl
           for userspace poll support

       cb_shared
           for userspace poll support

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                         STRUCT DMA_BUF(9)