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dma-buf/sync_file: Surface sync-file uABI 

We had all of the internal driver APIs, but not the all important
userspace uABI, in the dma-buf doc.  Fix that.  And re-arrange the
comments slightly as otherwise the comments for the ioctl nr defines
would not show up.

v2: Fix docs build warning coming from newly including the uabi header
    in the docs build

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Rob Clark 2023-02-28 10:10:11 -08:00
parent d7d5a21dd6
commit d71c11cc79
2 changed files with 23 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/driver-api/dma-buf.rst
View File

@ -203,8 +203,8 @@ DMA Fence unwrap
.. kernel-doc:: include/linux/dma-fence-unwrap.h
:internal:
DMA Fence uABI/Sync File
~~~~~~~~~~~~~~~~~~~~~~~~
DMA Fence Sync File
~~~~~~~~~~~~~~~~~~~
.. kernel-doc:: drivers/dma-buf/sync_file.c
:export:
@ -212,6 +212,12 @@ DMA Fence uABI/Sync File
.. kernel-doc:: include/linux/sync_file.h
:internal:
DMA Fence Sync File uABI
~~~~~~~~~~~~~~~~~~~~~~~~
.. kernel-doc:: include/uapi/linux/sync_file.h
:internal:
Indefinite DMA Fences
~~~~~~~~~~~~~~~~~~~~~

37
include/uapi/linux/sync_file.h
View File

@ -16,12 +16,16 @@
#include <linux/types.h>
/**
* struct sync_merge_data - data passed to merge ioctl
* struct sync_merge_data - SYNC_IOC_MERGE: merge two fences
* @name: name of new fence
* @fd2: file descriptor of second fence
* @fence: returns the fd of the new fence to userspace
* @flags: merge_data flags
* @pad: padding for 64-bit alignment, should always be zero
*
* Creates a new fence containing copies of the sync_pts in both
* the calling fd and sync_merge_data.fd2. Returns the new fence's
* fd in sync_merge_data.fence
*/
struct sync_merge_data {
char name[32];
@ -34,8 +38,8 @@ struct sync_merge_data {
/**
* struct sync_fence_info - detailed fence information
* @obj_name: name of parent sync_timeline
* @driver_name: name of driver implementing the parent
* @status: status of the fence 0:active 1:signaled <0:error
* @driver_name: name of driver implementing the parent
* @status: status of the fence 0:active 1:signaled <0:error
* @flags: fence_info flags
* @timestamp_ns: timestamp of status change in nanoseconds
*/
@ -48,14 +52,19 @@ struct sync_fence_info {
};
/**
* struct sync_file_info - data returned from fence info ioctl
* struct sync_file_info - SYNC_IOC_FILE_INFO: get detailed information on a sync_file
* @name: name of fence
* @status: status of fence. 1: signaled 0:active <0:error
* @flags: sync_file_info flags
* @num_fences number of fences in the sync_file
* @pad: padding for 64-bit alignment, should always be zero
* @sync_fence_info: pointer to array of structs sync_fence_info with all
* @sync_fence_info: pointer to array of struct &sync_fence_info with all
* fences in the sync_file
*
* Takes a struct sync_file_info. If num_fences is 0, the field is updated
* with the actual number of fences. If num_fences is > 0, the system will
* use the pointer provided on sync_fence_info to return up to num_fences of
* struct sync_fence_info, with detailed fence information.
*/
struct sync_file_info {
char name[32];
@ -69,30 +78,14 @@ struct sync_file_info {
#define SYNC_IOC_MAGIC '>'
/**
/*
* Opcodes 0, 1 and 2 were burned during a API change to avoid users of the
* old API to get weird errors when trying to handling sync_files. The API
* change happened during the de-stage of the Sync Framework when there was
* no upstream users available.
*/
/**
* DOC: SYNC_IOC_MERGE - merge two fences
*
* Takes a struct sync_merge_data. Creates a new fence containing copies of
* the sync_pts in both the calling fd and sync_merge_data.fd2. Returns the
* new fence's fd in sync_merge_data.fence
*/
#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
/**
* DOC: SYNC_IOC_FILE_INFO - get detailed information on a sync_file
*
* Takes a struct sync_file_info. If num_fences is 0, the field is updated
* with the actual number of fences. If num_fences is > 0, the system will
* use the pointer provided on sync_fence_info to return up to num_fences of
* struct sync_fence_info, with detailed fence information.
*/
#define SYNC_IOC_FILE_INFO _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)
#endif /* _UAPI_LINUX_SYNC_H */