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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

January 2017 Kernel Hackers Manual 4.8.