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soc: qcom: Add forever loop after non-secure bite configuration

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The core which induces the non-secure bite should not
proceed further. Non-secure bite is a secure interrupt
and one of the core handles and that may not be the same
core which configured the watchdog. Add forever loop
after non-secure bit programming, so that core do not
proceed further.

Change-Id: I5523ad00d47755df6eed2bfb9210b585ee22f4ed
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>
This commit is contained in:
Prakruthi Deepak Heragu 2020-02-04 15:17:54 -08:00
commit 9b5a973855
1 changed files with 12 additions and 2 deletions
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14
drivers/soc/qcom/qcom_watchdog.c
View file

@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012-2019, The Linux Foundation. All rights reserved.
* Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
*/
#include <linux/module.h>
@ -491,6 +491,16 @@ void msm_trigger_wdog_bite(void)
__raw_readl(wdog_data->base + WDT0_EN),
__raw_readl(wdog_data->base + WDT0_BARK_TIME),
__raw_readl(wdog_data->base + WDT0_BITE_TIME));
/*
* This function induces the non-secure bite and control
* should not return to the calling function. Non-secure
* bite interrupt is affined to all the cores and it may
* not be handled by the same cores which configured
* non-secure bite. So add forever loop here.
*/
while (1)
udelay(1);
}
EXPORT_SYMBOL(msm_trigger_wdog_bite);
@ -510,7 +520,7 @@ static irqreturn_t wdog_bark_handler(int irq, void *dev_id)
if (wdog_dd->do_ipi_ping)
dump_cpu_alive_mask(wdog_dd);
msm_trigger_wdog_bite();
panic("Failed to cause a watchdog bite! - Falling back to kernel panic!");
return IRQ_HANDLED;
}