linux-kernel - [PATCH 3/6] remoteproc: sysmon: Inform current rproc about all active rprocs

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Message-Id: <1582167465-2549-4-git-send-email-sidgup@codeaurora.org>
Date:   Wed, 19 Feb 2020 18:57:42 -0800
From:   Siddharth Gupta <sidgup@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org, ohad@...ery.com
Cc:     Siddharth Gupta <sidgup@...eaurora.org>,
        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: [PATCH 3/6] remoteproc: sysmon: Inform current rproc about all active rprocs

A remoteproc that has just recovered from a crash will not be aware of the
state of other remoteprocs. Send sysmon notifications on behalf of all the
active/online remoteprocs to the one that just booted up.

Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
---
 drivers/remoteproc/qcom_sysmon.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/remoteproc/qcom_sysmon.c b/drivers/remoteproc/qcom_sysmon.c
index 851664e..d0d59d5 100644
--- a/drivers/remoteproc/qcom_sysmon.c
+++ b/drivers/remoteproc/qcom_sysmon.c
@@ -457,6 +457,7 @@ static int sysmon_start(struct rproc_subdev *subdev)
 {
 	struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon,
 						  subdev);
+	struct qcom_sysmon *target;
 	struct sysmon_event event = {
 		.subsys_name = sysmon->name,
 		.ssr_event = SSCTL_SSR_EVENT_AFTER_POWERUP
@@ -464,6 +465,17 @@ static int sysmon_start(struct rproc_subdev *subdev)
 
 	blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event);
 
+	mutex_lock(&sysmon_lock);
+	list_for_each_entry(target, &sysmon_list, node) {
+		if (target == sysmon ||
+		    target->rproc->state != RPROC_RUNNING)
+			continue;
+
+		event.subsys_name = target->name;
+		ssctl_send_event(sysmon, &event);
+	}
+	mutex_unlock(&sysmon_lock);
+
 	return 0;
 }
 
-- 
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