linux-kernel - [V2 5/6] remoteproc: q6v5: Set q6 state to offline on receiving wdog irq

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Date:   Mon, 30 May 2022 11:52:50 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     <bjorn.andersson@...aro.org>
CC:     <agross@...nel.org>, <mathieu.poirier@...aro.org>,
        <dmitry.baryshkov@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <konrad.dybcio@...ainline.org>,
        Siddharth Gupta <sidgup@...eaurora.org>,
        Sibi Sankar <quic_sibis@...cinc.com>
Subject: [V2 5/6] remoteproc: q6v5: Set q6 state to offline on receiving wdog irq

From: Siddharth Gupta <sidgup@...eaurora.org>

Due to firmware bugs on the Q6 the hardware watchdog irq can be triggered
multiple times. As the remoteproc framework schedules work items for the
recovery process, if the other threads do not get a chance to run before
recovery is completed the proceeding threads will see the state of the
remoteproc as running and kill the remoteproc while it is running. This
can result in various SMMU and NOC errors. This change sets the state of
the remoteproc to offline whenever a watchdog irq is received.

Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
---
 drivers/remoteproc/qcom_q6v5.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c
index 5280ec9b5449..497acfb33f8f 100644
--- a/drivers/remoteproc/qcom_q6v5.c
+++ b/drivers/remoteproc/qcom_q6v5.c
@@ -112,6 +112,7 @@ static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
 	else
 		dev_err(q6v5->dev, "watchdog without message\n");
 
+	q6v5->running = false;
 	rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);
 
 	return IRQ_HANDLED;
@@ -123,6 +124,9 @@ static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
 	size_t len;
 	char *msg;
 
+	if (!q6v5->running)
+		return IRQ_HANDLED;
+
 	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
 	if (!IS_ERR(msg) && len > 0 && msg[0])
 		dev_err(q6v5->dev, "fatal error received: %s\n", msg);
-- 
2.7.4