linux-kernel - Re: [PATCH v6 1/2] remoteproc: qcom: Add per subsystem SSR notification

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Message-ID: <98e3a18e-1491-6f20-6507-d6e6817b76fe@nvidia.com>
Date:   Mon, 13 Jul 2020 17:26:42 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <bjorn.andersson@...aro.org>, <tsoni@...eaurora.org>,
        <psodagud@...eaurora.org>, <sidgup@...eaurora.org>,
        <elder@...e.org>, linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] remoteproc: qcom: Add per subsystem SSR
 notification


On 24/06/2020 03:23, Rishabh Bhatnagar wrote:
> Currently there is a single notification chain which is called whenever any
> remoteproc shuts down. This leads to all the listeners being notified, and
> is not an optimal design as kernel drivers might only be interested in
> listening to notifications from a particular remoteproc. Create a global
> list of remoteproc notification info data structures. This will hold the
> name and notifier_list information for a particular remoteproc. The API
> to register for notifications will use name argument to retrieve the
> notification info data structure and the notifier block will be added to
> that data structure's notification chain. Also move from blocking notifier
> to srcu notifer based implementation to support dynamic notifier head
> creation.
> 
> Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> ---
>  drivers/remoteproc/qcom_common.c      | 90 ++++++++++++++++++++++++++++++-----
>  drivers/remoteproc/qcom_common.h      |  5 +-
>  include/linux/remoteproc/qcom_rproc.h | 20 ++++++--
>  3 files changed, 95 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
> index 9028cea..7a7384c 100644
> --- a/drivers/remoteproc/qcom_common.c
> +++ b/drivers/remoteproc/qcom_common.c
> @@ -12,6 +12,7 @@
>  #include <linux/module.h>
>  #include <linux/notifier.h>
>  #include <linux/remoteproc.h>
> +#include <linux/remoteproc/qcom_rproc.h>
>  #include <linux/rpmsg/qcom_glink.h>
>  #include <linux/rpmsg/qcom_smd.h>
>  #include <linux/soc/qcom/mdt_loader.h>
> @@ -23,7 +24,14 @@
>  #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
>  #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
>  
> -static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
> +struct qcom_ssr_subsystem {
> +	const char *name;
> +	struct srcu_notifier_head notifier_list;
> +	struct list_head list;
> +};
> +
> +static LIST_HEAD(qcom_ssr_subsystem_list);
> +static DEFINE_MUTEX(qcom_ssr_subsys_lock);
>  
>  static int glink_subdev_start(struct rproc_subdev *subdev)
>  {
> @@ -189,37 +197,83 @@ void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
>  }
>  EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
>  
> +static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
> +{
> +	struct qcom_ssr_subsystem *info;
> +
> +	mutex_lock(&qcom_ssr_subsys_lock);
> +	/* Match in the global qcom_ssr_subsystem_list with name */
> +	list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
> +		if (!strcmp(info->name, name))
> +			goto out;
> +
> +	info = kzalloc(sizeof(*info), GFP_KERNEL);
> +	if (!info) {
> +		info = ERR_PTR(-ENOMEM);
> +		goto out;
> +	}


The above appears to be breaking the ARM64 build on the latest -next
when building the modules  ...
 
  CC [M]  drivers/remoteproc/qcom_common.o
drivers/remoteproc/qcom_common.c: In function 'qcom_ssr_get_subsys':
remoteproc/qcom_common.c:210:9: error: implicit declaration of function 'kzalloc' [-Werror=implicit-function-declaration]
  info = kzalloc(sizeof(*info), GFP_KERNEL);
         ^~~~~~~
drivers/remoteproc/qcom_common.c:210:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
  info = kzalloc(sizeof(*info), GFP_KERNEL);

Cheers
Jon

-- 
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