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    SubjectRe: [PATCH 13/15] iio: core: Add support for cyclic buffers
    On Mon, Nov 15, 2021 at 4:22 PM Paul Cercueil <paul@crapouillou.net> wrote:
    >
    > Introduce a new flag IIO_BUFFER_DMABUF_CYCLIC in the "flags" field of
    > the iio_dmabuf uapi structure.
    >
    > When set, the DMABUF enqueued with the enqueue ioctl will be endlessly
    > repeated on the TX output, until the buffer is disabled.
    >

    Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>

    > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
    > ---
    > drivers/iio/industrialio-buffer.c | 5 +++++
    > include/uapi/linux/iio/buffer.h | 3 ++-
    > 2 files changed, 7 insertions(+), 1 deletion(-)
    >
    > diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
    > index 30910e6c2346..41bc51c88002 100644
    > --- a/drivers/iio/industrialio-buffer.c
    > +++ b/drivers/iio/industrialio-buffer.c
    > @@ -1600,6 +1600,11 @@ static int iio_buffer_enqueue_dmabuf(struct iio_buffer *buffer,
    > if (dmabuf.flags & ~IIO_BUFFER_DMABUF_SUPPORTED_FLAGS)
    > return -EINVAL;
    >
    > + /* Cyclic flag is only supported on output buffers */
    > + if ((dmabuf.flags & IIO_BUFFER_DMABUF_CYCLIC) &&
    > + buffer->direction != IIO_BUFFER_DIRECTION_OUT)
    > + return -EINVAL;
    > +
    > return buffer->access->enqueue_dmabuf(buffer, &dmabuf);
    > }
    >
    > diff --git a/include/uapi/linux/iio/buffer.h b/include/uapi/linux/iio/buffer.h
    > index e4621b926262..2d541d038c02 100644
    > --- a/include/uapi/linux/iio/buffer.h
    > +++ b/include/uapi/linux/iio/buffer.h
    > @@ -7,7 +7,8 @@
    >
    > #include <linux/types.h>
    >
    > -#define IIO_BUFFER_DMABUF_SUPPORTED_FLAGS 0x00000000
    > +#define IIO_BUFFER_DMABUF_CYCLIC (1 << 0)
    > +#define IIO_BUFFER_DMABUF_SUPPORTED_FLAGS 0x00000001
    >
    > /**
    > * struct iio_dmabuf_alloc_req - Descriptor for allocating IIO DMABUFs
    > --
    > 2.33.0
    >

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