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Commit f4674e29 authored by Deepak Katragadda's avatar Deepak Katragadda
Browse files

qcom: ssr: Allow taking system ramdumps when system_debug is set 



Add a new system_debug subsystem property. This is set as
"reset" by default. When this parameter is listed as "set"
for a subsystem and a wdog bite happens, the SSR framework
goes ahead and triggers a kernel panic.
This feature is strictly intented only for debugging cases
where a system ramdump is more desirable than subsystem
ramdumps.

CRs-Fixed: 746414
Change-Id: Ie8f364fe0f9fd8f417f080135ab497e816f7fcf4
Signed-off-by: default avatarDeepak Katragadda <dkatraga@codeaurora.org>
parent e098c293

drivers/soc/qcom/pil-q6v5-mss.c

+5 −0
Original line number Diff line number Diff line
@@ -186,7 +186,12 @@ static irqreturn_t modem_wdog_bite_intr_handler(int irq, void *dev_id) 
	struct modem_data *drv = subsys_to_drv(dev_id);

	if (drv->ignore_errors)

		return IRQ_HANDLED;



	pr_err("Watchdog bite received from modem software!\n");

	if (drv->subsys_desc.system_debug &&

			!gpio_get_value(drv->subsys_desc.err_fatal_gpio))

		panic("%s: System ramdump requested. Triggering device restart!\n",

							__func__);

	subsys_set_crash_status(drv->subsys, true);

	restart_modem(drv);

	return IRQ_HANDLED;

drivers/soc/qcom/subsys-pil-tz.c

+5 −0
Original line number Diff line number Diff line
@@ -849,6 +849,11 @@ static irqreturn_t subsys_wdog_bite_irq_handler(int irq, void *dev_id) 
							d->subsys_desc.name);

		return IRQ_HANDLED;

	}



	if (d->subsys_desc.system_debug &&

			!gpio_get_value(d->subsys_desc.err_fatal_gpio))

		panic("%s: System ramdump requested. Triggering device restart!\n",

							__func__);

	subsys_set_crash_status(d->subsys, true);

	log_failure_reason(d);

	subsystem_restart_dev(d->subsys);

drivers/soc/qcom/subsystem_restart.c

+33 −0
Original line number Diff line number Diff line
@@ -226,6 +226,38 @@ static ssize_t restart_level_store(struct device *dev, 
	return -EPERM;

}



static ssize_t system_debug_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct subsys_device *subsys = to_subsys(dev);

	char p[6] = "set";



	if (!subsys->desc->system_debug)

		strlcpy(p, "reset", sizeof(p));



	return snprintf(buf, PAGE_SIZE, "%s\n", p);

}



static ssize_t system_debug_store(struct device *dev,

				struct device_attribute *attr, const char *buf,

				size_t count)

{

	struct subsys_device *subsys = to_subsys(dev);

	const char *p;



	p = memchr(buf, '\n', count);

	if (p)

		count = p - buf;



	if (!strncasecmp(buf, "set", count))

		subsys->desc->system_debug = true;

	else if (!strncasecmp(buf, "reset", count))

		subsys->desc->system_debug = false;

	else

		return -EPERM;

	return count;

}



int subsys_get_restart_level(struct subsys_device *dev)

{

	return dev->restart_level;
@@ -266,6 +298,7 @@ static struct device_attribute subsys_attrs[] = { 
	__ATTR_RO(state),

	__ATTR_RO(crash_count),

	__ATTR(restart_level, 0644, restart_level_show, restart_level_store),

	__ATTR(system_debug, 0644, system_debug_show, system_debug_store),

	__ATTR_NULL,

};

include/soc/qcom/subsystem_restart.h

+3 −0
Original line number Diff line number Diff line
@@ -45,6 +45,8 @@ struct module; 
 * @ssctl_instance_id: Instance id used to connect with SSCTL service

 * @sysmon_pid:	pdev id that sysmon is probed with for the subsystem

 * @sysmon_shutdown_ret: Return value for the call to sysmon_send_shutdown

 * @system_debug: If "set", triggers a device restart when the

 * subsystem's wdog bite handler is invoked.

 */

struct subsys_desc {

	const char *name;
@@ -72,6 +74,7 @@ struct subsys_desc { 
	int ssctl_instance_id;

	u32 sysmon_pid;

	int sysmon_shutdown_ret;

	bool system_debug;

};



/**