Re: [PATCH 4/6] drivers: remoteproc: Add name field for every subdevice

Mathieu Poirier
2020-02-27T20:14:14Z

On Wed, Feb 19, 2020 at 06:57:43PM -0800, Siddharth Gupta wrote:
> From: Rishabh Bhatnagar <rishabhb@codeaurora.org>
>
> When a client driver wishes to utilize functionality from a particular
> subdevice of a remoteproc, it cannot differentiate between the subdevices
> that have been added. This patch allows the client driver to distinguish
> between subdevices and thus utilize their functionality.
>
> Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
> Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
> ---
> drivers/remoteproc/qcom_common.c | 6 ++++++
> include/linux/remoteproc.h | 2 ++
> 2 files changed, 8 insertions(+)
>
> diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
> index 60650bc..5d59538 100644
> --- a/drivers/remoteproc/qcom_common.c
> +++ b/drivers/remoteproc/qcom_common.c
> @@ -58,6 +58,7 @@ void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
> glink->dev = dev;
> glink->subdev.start = glink_subdev_start;
> glink->subdev.stop = glink_subdev_stop;
> + glink->subdev.name = kstrdup("glink", GFP_KERNEL);

Because @subdev is a member of qcom_rproc_glink (rather than a pointer), it is
possible to get to glink with container_of(). From there edge->name is
available - would that work?

>
> rproc_add_subdev(rproc, &glink->subdev);
> }
> @@ -73,6 +74,7 @@ void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glin
> if (!glink->node)
> return;
>
> + kfree(glink->subdev.name);
> rproc_remove_subdev(rproc, &glink->subdev);
> of_node_put(glink->node);
> }
> @@ -154,6 +156,7 @@ void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
> smd->dev = dev;
> smd->subdev.start = smd_subdev_start;
> smd->subdev.stop = smd_subdev_stop;
> + smd->subdev.name = kstrdup("smd", GFP_KERNEL);

Same as above - qcom_smd_edge has a name.

Worse case scenario, both qcom_rproc_glink and qcom_smd_edge have a device_node
that can be used as well.

>
> rproc_add_subdev(rproc, &smd->subdev);
> }
> @@ -169,6 +172,7 @@ void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
> if (!smd->node)
> return;
>
> + kfree(smd->subdev.name);
> rproc_remove_subdev(rproc, &smd->subdev);
> of_node_put(smd->node);
> }
> @@ -220,6 +224,7 @@ void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
> const char *ssr_name)
> {
> ssr->name = ssr_name;
> + ssr->subdev.name = kstrdup("ssr_notifs", GFP_KERNEL);
> ssr->subdev.unprepare = ssr_notify_unprepare;
>
> rproc_add_subdev(rproc, &ssr->subdev);
> @@ -233,6 +238,7 @@ EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
> */
> void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
> {
> + kfree(ssr->subdev.name);
> rproc_remove_subdev(rproc, &ssr->subdev);
> }
> EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index e2eaba9..e2f60cc 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -519,6 +519,7 @@ struct rproc {
> /**
> * struct rproc_subdev - subdevice tied to a remoteproc
> * @node: list node related to the rproc subdevs list
> + * @name: name of the subdevice
> * @prepare: prepare function, called before the rproc is started
> * @start: start function, called after the rproc has been started
> * @stop: stop function, called before the rproc is stopped; the @crashed
> @@ -527,6 +528,7 @@ struct rproc {
> */
> struct rproc_subdev {
> struct list_head node;
> + char *name;
>
> int (*prepare)(struct rproc_subdev *subdev);
> int (*start)(struct rproc_subdev *subdev);
> --
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project