Em Sat, 4 Aug 2018 14:45:21 +0200
Hans Verkuil <hverk...@xs4all.nl> escreveu:
> From: Hans Verkuil <hans.verk...@cisco.com>
>
> For mem2mem devices we have to make sure that v4l2_m2m_try_schedule()
> is called whenever a request is queued.
>
> We do that by creating a vb2_m2m_request_queue() helper that should
> be used instead of the 'normal' vb2_request_queue() helper. The m2m
> helper function will call v4l2_m2m_try_schedule() as needed.
>
> In addition we also avoid calling v4l2_m2m_try_schedule() when preparing
> or queueing a buffer for a request since that is no longer needed.
> Instead this helper function will do that when the request is actually
> queued.
>
> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
But please notice below that there's another change on patch 1/34 due
to this patchset.
> ---
> drivers/media/v4l2-core/v4l2-mem2mem.c | 59 ++++++++++++++++++++++----
> include/media/v4l2-mem2mem.h | 4 ++
> 2 files changed, 55 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c
> b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index b09494174eb4..56a16cfef6f8 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -369,7 +369,7 @@ static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx
> *m2m_ctx)
> spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
> if (m2m_dev->m2m_ops->job_abort)
> m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
> - dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx);
> + dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
> wait_event(m2m_ctx->finished,
> !(m2m_ctx->job_flags & TRANS_RUNNING));
> } else if (m2m_ctx->job_flags & TRANS_QUEUED) {
> @@ -460,8 +460,14 @@ int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx
> *m2m_ctx,
> int ret;
>
> vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
> + if (!V4L2_TYPE_IS_OUTPUT(vq->type) &&
> + (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
> + dprintk("%s: requests cannot be used with capture buffers\n",
> + __func__);
I had to double-check the documentation at patch 01/34. While on one
part is says the same, saying that -EPERM is the error code, on
another part, it says:
+Note that there is typically no need to use the Request API for
CAPTURE buffers
+since there are no per-frame settings to report there.
"typically" means that the normal usecase is to now allow, but gives
it open to implementations doing it.
Please fix that paragraph on patch 01/34 to reflect that no CAPTURE
buffers should be used with request API for m2m, in order to
reflect the code's implementation.
> + return -EPERM;
> + }
> ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
> - if (!ret)
> + if (!ret && !(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
> v4l2_m2m_try_schedule(m2m_ctx);
>
> return ret;
> @@ -483,14 +489,9 @@ int v4l2_m2m_prepare_buf(struct file *file, struct
> v4l2_m2m_ctx *m2m_ctx,
> {
> struct video_device *vdev = video_devdata(file);
> struct vb2_queue *vq;
> - int ret;
>
> vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
> - ret = vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
> - if (!ret)
> - v4l2_m2m_try_schedule(m2m_ctx);
> -
> - return ret;
> + return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
> }
> EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
>
> @@ -934,6 +935,48 @@ void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
> }
> EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
>
> +void vb2_m2m_request_queue(struct media_request *req)
> +{
> + struct media_request_object *obj, *obj_safe;
> + struct v4l2_m2m_ctx *m2m_ctx = NULL;
> +
> + /* Queue all non-buffer objects */
> + list_for_each_entry_safe(obj, obj_safe, &req->objects, list)
> + if (obj->ops->queue && !vb2_request_object_is_buffer(obj))
> + obj->ops->queue(obj);
> +
> + /* Queue all buffer objects */
> + list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
> + struct v4l2_m2m_ctx *m2m_ctx_obj;
> + struct vb2_buffer *vb;
> +
> + if (!obj->ops->queue || !vb2_request_object_is_buffer(obj))
> + continue;
> +
> + /* Sanity checks */
> + vb = container_of(obj, struct vb2_buffer, req_obj);
> + WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
> + m2m_ctx_obj = container_of(vb->vb2_queue,
> + struct v4l2_m2m_ctx,
> + out_q_ctx.q);
> + WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
> + m2m_ctx = m2m_ctx_obj;
> +
> + /*
> + * The buffer we queue here can in theory be immediately
> + * unbound, hence the use of list_for_each_entry_safe()
> + * above and why we call the queue op last.
> + */
> + obj->ops->queue(obj);
> + }
> +
> + WARN_ON(!m2m_ctx);
> +
> + if (m2m_ctx)
> + v4l2_m2m_try_schedule(m2m_ctx);
> +}
> +EXPORT_SYMBOL_GPL(vb2_m2m_request_queue);
> +
> /* Videobuf2 ioctl helpers */
>
> int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
> diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
> index d655720e16a1..58c1ecf3d648 100644
> --- a/include/media/v4l2-mem2mem.h
> +++ b/include/media/v4l2-mem2mem.h
> @@ -622,6 +622,10 @@ v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx
> *m2m_ctx, unsigned int idx)
> return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx);
> }
>
> +/* v4l2 request helper */
> +
> +void vb2_m2m_request_queue(struct media_request *req);
> +
> /* v4l2 ioctl helpers */
>
> int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
Thanks,
Mauro
