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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. |