Le vendredi 15 décembre 2017 à 16:56 +0900, Alexandre Courbot a écrit : > Here is a new attempt at the request API, following the UAPI we agreed on in > Prague. Hopefully this can be used as the basis to move forward. > > This series only introduces the very basics of how requests work: allocate a > request, queue buffers to it, queue the request itself, wait for it to > complete, > reuse it. It does *not* yet use Hans' work with controls setting. I have > preferred to submit it this way for now as it allows us to concentrate on the > basic request/buffer flow, which was harder to get properly than I initially > thought. I still have a gut feeling that it can be improved, with less > back-and- > forth into drivers. > > Plugging in controls support should not be too hard a task (basically just > apply > the saved controls when the request starts), and I am looking at it now. > > The resulting vim2m driver can be successfully used with requests, and my > tests > so far have been successful. > > There are still some rougher edges: > > * locking is currently quite coarse-grained > * too many #ifdef CONFIG_MEDIA_CONTROLLER in the code, as the request API > depends on it - I plan to craft the headers so that it becomes unnecessary. > As it is, some of the code will probably not even compile if > CONFIG_MEDIA_CONTROLLER is not set
Would it be possible to explain why this relation between request and the media controller ? Why couldn't request be created from video devices ? > > But all in all I think the request flow should be clear and easy to review, > and > the possibility of custom queue and entity support implementations should give > us the flexibility we need to support more specific use-cases (I expect the > generic implementations to be sufficient most of the time though). > > A very simple test program exercising this API is available here (don't forget > to adapt the /dev/media0 hardcoding): > https://gist.github.com/Gnurou/dbc3776ed97ea7d4ce6041ea15eb0438 > > Looking forward to your feedback and comments! > > Alexandre Courbot (8): > media: add request API core and UAPI > media: request: add generic queue > media: request: add generic entity ops > media: vb2: add support for requests > media: vb2: add support for requests in QBUF ioctl > media: v4l2-mem2mem: add request support > media: vim2m: add media device > media: vim2m: add request support > > Hans Verkuil (1): > videodev2.h: Add request field to v4l2_buffer > > drivers/media/Makefile | 4 +- > drivers/media/media-device.c | 6 + > drivers/media/media-request-entity-generic.c | 56 ++++ > drivers/media/media-request-queue-generic.c | 150 ++++++++++ > drivers/media/media-request.c | 390 > ++++++++++++++++++++++++++ > drivers/media/platform/vim2m.c | 46 +++ > drivers/media/usb/cpia2/cpia2_v4l.c | 2 +- > drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 7 +- > drivers/media/v4l2-core/v4l2-ioctl.c | 99 ++++++- > drivers/media/v4l2-core/v4l2-mem2mem.c | 34 +++ > drivers/media/v4l2-core/videobuf2-core.c | 59 +++- > drivers/media/v4l2-core/videobuf2-v4l2.c | 32 ++- > include/media/media-device.h | 3 + > include/media/media-entity.h | 6 + > include/media/media-request.h | 282 +++++++++++++++++++ > include/media/v4l2-mem2mem.h | 19 ++ > include/media/videobuf2-core.h | 25 +- > include/media/videobuf2-v4l2.h | 2 + > include/uapi/linux/media.h | 11 + > include/uapi/linux/videodev2.h | 3 +- > 20 files changed, 1216 insertions(+), 20 deletions(-) > create mode 100644 drivers/media/media-request-entity-generic.c > create mode 100644 drivers/media/media-request-queue-generic.c > create mode 100644 drivers/media/media-request.c > create mode 100644 include/media/media-request.h >
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