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Date: Wed, 15 Apr 2020 11:03:22 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Siddharth Gupta <sidgup@...eaurora.org>
Cc: agross@...nel.org, bjorn.andersson@...aro.org, ohad@...ery.com,
linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, tsoni@...eaurora.org,
psodagud@...eaurora.org, rishabhb@...eaurora.org
Subject: Re: [PATCH v2 1/6] remoteproc: sysmon: Add ability to send type of
notification
On Wed, Apr 08, 2020 at 04:36:38PM -0700, Siddharth Gupta wrote:
> Current implementation of the sysmon driver does not support adding
> notifications for other remoteproc events - prepare, start, unprepare.
> Clients on the remoteproc side might be interested in knowing when a
> remoteproc boots up. This change adds the ability to send the notification
> type along with the name. For example, audio DSP is interested in knowing
> when modem has crashed so that it can perform cleanup and wait for modem to
> boot up before it starts processing data again.
>
> Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
> drivers/remoteproc/qcom_sysmon.c | 54 +++++++++++++++++++++++++++-------------
> 1 file changed, 37 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/remoteproc/qcom_sysmon.c b/drivers/remoteproc/qcom_sysmon.c
> index faf3822..1366050 100644
> --- a/drivers/remoteproc/qcom_sysmon.c
> +++ b/drivers/remoteproc/qcom_sysmon.c
> @@ -46,6 +46,25 @@ struct qcom_sysmon {
> struct sockaddr_qrtr ssctl;
> };
>
> +enum {
> + SSCTL_SSR_EVENT_BEFORE_POWERUP,
> + SSCTL_SSR_EVENT_AFTER_POWERUP,
> + SSCTL_SSR_EVENT_BEFORE_SHUTDOWN,
> + SSCTL_SSR_EVENT_AFTER_SHUTDOWN,
> +};
> +
> +static const char * const sysmon_state_string[] = {
> + [SSCTL_SSR_EVENT_BEFORE_POWERUP] = "before_powerup",
> + [SSCTL_SSR_EVENT_AFTER_POWERUP] = "after_powerup",
> + [SSCTL_SSR_EVENT_BEFORE_SHUTDOWN] = "before_shutdown",
> + [SSCTL_SSR_EVENT_AFTER_SHUTDOWN] = "after_shutdown",
> +};
> +
> +struct sysmon_event {
> + const char *subsys_name;
> + u32 ssr_event;
> +};
> +
> static DEFINE_MUTEX(sysmon_lock);
> static LIST_HEAD(sysmon_list);
>
> @@ -54,13 +73,15 @@ static LIST_HEAD(sysmon_list);
> * @sysmon: sysmon context
> * @name: other remote's name
> */
> -static void sysmon_send_event(struct qcom_sysmon *sysmon, const char *name)
> +static void sysmon_send_event(struct qcom_sysmon *sysmon,
> + const struct sysmon_event *event)
> {
> char req[50];
> int len;
> int ret;
>
> - len = snprintf(req, sizeof(req), "ssr:%s:before_shutdown", name);
> + len = snprintf(req, sizeof(req), "ssr:%s:%s", event->subsys_name,
> + sysmon_state_string[event->ssr_event]);
> if (len >= sizeof(req))
> return;
>
> @@ -149,13 +170,6 @@ static int sysmon_callback(struct rpmsg_device *rpdev, void *data, int count,
> #define SSCTL_SUBSYS_NAME_LENGTH 15
>
> enum {
> - SSCTL_SSR_EVENT_BEFORE_POWERUP,
> - SSCTL_SSR_EVENT_AFTER_POWERUP,
> - SSCTL_SSR_EVENT_BEFORE_SHUTDOWN,
> - SSCTL_SSR_EVENT_AFTER_SHUTDOWN,
> -};
> -
> -enum {
> SSCTL_SSR_EVENT_FORCED,
> SSCTL_SSR_EVENT_GRACEFUL,
> };
> @@ -331,7 +345,8 @@ static void ssctl_request_shutdown(struct qcom_sysmon *sysmon)
> * @sysmon: sysmon context
> * @name: other remote's name
> */
> -static void ssctl_send_event(struct qcom_sysmon *sysmon, const char *name)
> +static void ssctl_send_event(struct qcom_sysmon *sysmon,
> + const struct sysmon_event *event)
> {
> struct ssctl_subsys_event_resp resp;
> struct ssctl_subsys_event_req req;
> @@ -346,9 +361,9 @@ static void ssctl_send_event(struct qcom_sysmon *sysmon, const char *name)
> }
>
> memset(&req, 0, sizeof(req));
> - strlcpy(req.subsys_name, name, sizeof(req.subsys_name));
> + strlcpy(req.subsys_name, event->subsys_name, sizeof(req.subsys_name));
> req.subsys_name_len = strlen(req.subsys_name);
> - req.event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN;
> + req.event = event->ssr_event;
> req.evt_driven_valid = true;
> req.evt_driven = SSCTL_SSR_EVENT_FORCED;
>
> @@ -432,8 +447,12 @@ static int sysmon_start(struct rproc_subdev *subdev)
> static void sysmon_stop(struct rproc_subdev *subdev, bool crashed)
> {
> struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, subdev);
> + struct sysmon_event event = {
> + .subsys_name = sysmon->name,
> + .ssr_event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN
> + };
>
> - blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)sysmon->name);
> + blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event);
>
> /* Don't request graceful shutdown if we've crashed */
> if (crashed)
> @@ -456,19 +475,20 @@ static int sysmon_notify(struct notifier_block *nb, unsigned long event,
> {
> struct qcom_sysmon *sysmon = container_of(nb, struct qcom_sysmon, nb);
> struct rproc *rproc = sysmon->rproc;
> - const char *ssr_name = data;
> + struct sysmon_event *sysmon_event = data;
>
> /* Skip non-running rprocs and the originating instance */
> - if (rproc->state != RPROC_RUNNING || !strcmp(data, sysmon->name)) {
> + if (rproc->state != RPROC_RUNNING ||
> + !strcmp(sysmon_event->subsys_name, sysmon->name)) {
> dev_dbg(sysmon->dev, "not notifying %s\n", sysmon->name);
> return NOTIFY_DONE;
> }
>
> /* Only SSCTL version 2 supports SSR events */
> if (sysmon->ssctl_version == 2)
> - ssctl_send_event(sysmon, ssr_name);
> + ssctl_send_event(sysmon, sysmon_event);
> else if (sysmon->ept)
> - sysmon_send_event(sysmon, ssr_name);
> + sysmon_send_event(sysmon, sysmon_event);
>
> return NOTIFY_DONE;
> }
> --
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
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