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Commit bb5369d5 authored by Yimin Peng's avatar Yimin Peng
Browse files

power: reset: Add reset support for MSM VM 



Trigger watchdog bite for panic reset on virtual machine.

Change-Id: Id955e0b8114635caaa6a669656bccfa35c9a4f4e
Signed-off-by: default avatarYimin Peng <yiminp@codeaurora.org>
parent 5af8d318

Documentation/devicetree/bindings/power/reset/msm-vm-poweroff.txt

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MSM VM Restart Driver



A restart driver to trigger memdump on msm virtual machine.



Required Properties:

-compatible: "qcom,vm-restart"



Example:



	vm_restart: restart {

		compatible = "qcom,vm-restart";

		status = "ok";

	};

drivers/power/reset/Kconfig

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@@ -134,6 +134,15 @@ config POWER_RESET_QCOM 
	  Say Y here if you have a Qualcomm Tecnologies, Inc. board and wish to

	  enable restart driver.



config POWER_RESET_QCOM_VM

	bool "Qualcomm Technologies, Inc. MSM VM power-off driver"

	depends on QTI_GVM

	help

	  Power off and restart support for Qualcomm Technologies, Inc. virtual

	  machine. This driver supports virtual machine power down and restart.

	  Say Y here if you have a MSM virtual machine and wish to enable

	  restart driver.



config QCOM_DLOAD_MODE

	bool "Qualcomm Technologies, Inc. download mode"

	depends on POWER_RESET_QCOM

drivers/power/reset/Makefile

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@@ -13,6 +13,7 @@ obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o 
obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o

obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o

obj-$(CONFIG_POWER_RESET_QCOM) += msm-poweroff.o

obj-$(CONFIG_POWER_RESET_QCOM_VM) += msm-vm-poweroff.o

obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o

obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o

obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o

drivers/power/reset/msm-vm-poweroff.c

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/* Copyright (c) 2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#include <linux/io.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/reboot.h>

#include <linux/pm.h>

#include <linux/delay.h>

#include <linux/of_address.h>



#include <asm/system_misc.h>

#include <soc/qcom/watchdog.h>



static int in_panic;

static void (*old_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);



static int panic_prep_restart(struct notifier_block *this,

			      unsigned long event, void *ptr)

{

	in_panic = 1;

	return NOTIFY_DONE;

}



static struct notifier_block panic_blk = {

	.notifier_call	= panic_prep_restart,

};



static void do_vm_restart(enum reboot_mode reboot_mode, const char *cmd)

{

	pr_notice("Going down for vm restart now\n");



	if (in_panic)

		msm_trigger_wdog_bite();



	if (old_pm_restart)

		old_pm_restart(reboot_mode, cmd);

}



static int vm_restart_probe(struct platform_device *pdev)

{

	atomic_notifier_chain_register(&panic_notifier_list, &panic_blk);



	old_pm_restart = arm_pm_restart;

	arm_pm_restart = do_vm_restart;



	return 0;

}



static const struct of_device_id of_vm_restart_match[] = {

	{ .compatible = "qcom,vm-restart", },

	{},

};

MODULE_DEVICE_TABLE(of, of_vm_restart_match);



static struct platform_driver vm_restart_driver = {

	.probe = vm_restart_probe,

	.driver = {

		.name = "msm-vm-restart",

		.of_match_table = of_match_ptr(of_vm_restart_match),

	},

};



static int __init vm_restart_init(void)

{

	return platform_driver_register(&vm_restart_driver);

}

pure_initcall(vm_restart_init);