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media: mc: entity: Add pad iterator for media_pipeline

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Add a media_pipeline_for_each_pad() macro to iterate over pads in a
pipeline. This should be used by driver as a replacement of the
media_graph_walk API, as iterating over the media_pipeline uses the
cached list of pads and is thus more efficient.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart 2022-12-21 10:33:37 +01:00 committed by Mauro Carvalho Chehab
parent d7ff691399
commit d10ac51e8a
2 changed files with 47 additions and 0 deletions
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18
drivers/media/mc/mc-entity.c
View File

@ -945,6 +945,24 @@ out:
}
EXPORT_SYMBOL_GPL(media_pipeline_alloc_start);
struct media_pad *
__media_pipeline_pad_iter_next(struct media_pipeline *pipe,
struct media_pipeline_pad_iter *iter,
struct media_pad *pad)
{
if (!pad)
iter->cursor = pipe->pads.next;
if (iter->cursor == &pipe->pads)
return NULL;
pad = list_entry(iter->cursor, struct media_pipeline_pad, list)->pad;
iter->cursor = iter->cursor->next;
return pad;
}
EXPORT_SYMBOL_GPL(__media_pipeline_pad_iter_next);
/* -----------------------------------------------------------------------------
* Links management
*/

29
include/media/media-entity.h
View File

@ -130,6 +130,15 @@ struct media_pipeline_pad {
struct media_pad *pad;
};
/**
* struct media_pipeline_pad_iter - Iterator for media_pipeline_for_each_pad
*
* @cursor: The current element
*/
struct media_pipeline_pad_iter {
struct list_head *cursor;
};
/**
* struct media_link - A link object part of a media graph.
*
@ -1165,6 +1174,26 @@ void media_pipeline_stop(struct media_pad *pad);
*/
void __media_pipeline_stop(struct media_pad *pad);
struct media_pad *
__media_pipeline_pad_iter_next(struct media_pipeline *pipe,
struct media_pipeline_pad_iter *iter,
struct media_pad *pad);
/**
* media_pipeline_for_each_pad - Iterate on all pads in a media pipeline
* @pipe: The pipeline
* @iter: The iterator (struct media_pipeline_pad_iter)
* @pad: The iterator pad
*
* Iterate on all pads in a media pipeline. This is only valid after the
* pipeline has been built with media_pipeline_start() and before it gets
* destroyed with media_pipeline_stop().
*/
#define media_pipeline_for_each_pad(pipe, iter, pad) \
for (pad = __media_pipeline_pad_iter_next((pipe), iter, NULL); \
pad != NULL; \
pad = __media_pipeline_pad_iter_next((pipe), iter, pad))
/**
* media_pipeline_alloc_start - Mark a pipeline as streaming
* @pad: Starting pad