drivers/esoc/esoc-mdm-drv.c - kernel/msm-4.9 - Gitiles

 /* Copyright (c) 2013-2017, 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/delay.h>
 #include <linux/workqueue.h>
 #include <linux/reboot.h>
 #include "esoc.h"
 #include "mdm-dbg.h"

 enum {
 	 PWR_OFF = 0x1,
 	 PWR_ON,
 	 BOOT,
 	 RUN,
 	 CRASH,
 	 IN_DEBUG,
 	 SHUTDOWN,
 	 RESET,
 	 PEER_CRASH,
 };

 struct mdm_drv {
 	unsigned int mode;
 	struct esoc_eng cmd_eng;
 	struct completion boot_done;
 	struct completion req_eng_wait;
 	struct esoc_clink *esoc_clink;
 	bool boot_fail;
 	struct workqueue_struct *mdm_queue;
 	struct work_struct ssr_work;
 	struct notifier_block esoc_restart;
 };
 #define to_mdm_drv(d)	container_of(d, struct mdm_drv, cmd_eng)

 static int esoc_msm_restart_handler(struct notifier_block *nb,
 		unsigned long action, void *data)
 {
 	struct mdm_drv *mdm_drv = container_of(nb, struct mdm_drv,
 					esoc_restart);
 	struct esoc_clink *esoc_clink = mdm_drv->esoc_clink;
 	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

 	if (action == SYS_RESTART) {
 		if (mdm_dbg_stall_notify(ESOC_PRIMARY_REBOOT))
 			return NOTIFY_OK;
 		dev_dbg(&esoc_clink->dev, "Notifying esoc of cold reboot\n");
 		clink_ops->notify(ESOC_PRIMARY_REBOOT, esoc_clink);
 	}
 	return NOTIFY_OK;
 }
 static void mdm_handle_clink_evt(enum esoc_evt evt,
 					struct esoc_eng *eng)
 {
 	struct mdm_drv *mdm_drv = to_mdm_drv(eng);

 	switch (evt) {
 	case ESOC_INVALID_STATE:
 		mdm_drv->boot_fail = true;
 		complete(&mdm_drv->boot_done);
 		break;
 	case ESOC_RUN_STATE:
 		mdm_drv->boot_fail = false;
 		mdm_drv->mode = RUN,
 		complete(&mdm_drv->boot_done);
 		break;
 	case ESOC_UNEXPECTED_RESET:
 	case ESOC_ERR_FATAL:
 		if (mdm_drv->mode == CRASH)
 			return;
 		mdm_drv->mode = CRASH;
 		queue_work(mdm_drv->mdm_queue, &mdm_drv->ssr_work);
 		break;
 	case ESOC_REQ_ENG_ON:
 		complete(&mdm_drv->req_eng_wait);
 		break;
 	default:
 		break;
 	}
 }

 static void mdm_ssr_fn(struct work_struct *work)
 {
 	struct mdm_drv *mdm_drv = container_of(work, struct mdm_drv, ssr_work);

 	/*
 	 * If restarting esoc fails, the SSR framework triggers a kernel panic
 	 */
 	esoc_clink_request_ssr(mdm_drv->esoc_clink);
 }

 static void mdm_crash_shutdown(const struct subsys_desc *mdm_subsys)
 {
 	struct esoc_clink *esoc_clink =
 					container_of(mdm_subsys,
 							struct esoc_clink,
 								subsys);
 	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

 	if (mdm_dbg_stall_notify(ESOC_PRIMARY_CRASH))
 		return;

 	clink_ops->notify(ESOC_PRIMARY_CRASH, esoc_clink);
 }

 static int mdm_subsys_shutdown(const struct subsys_desc *crashed_subsys,
 							bool force_stop)
 {
 	int ret;
 	struct esoc_clink *esoc_clink =
 	 container_of(crashed_subsys, struct esoc_clink, subsys);
 	struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink);
 	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

 	if (mdm_drv->mode == CRASH || mdm_drv->mode == PEER_CRASH) {
 		if (mdm_dbg_stall_cmd(ESOC_PREPARE_DEBUG))
 			/* We want to mask debug command.
 			 * In this case return success
 			 * to move to next stage
 			 */
 			return 0;
 		ret = clink_ops->cmd_exe(ESOC_PREPARE_DEBUG,
 							esoc_clink);
 		if (ret) {
 			dev_err(&esoc_clink->dev, "failed to enter debug\n");
 			return ret;
 		}
 		mdm_drv->mode = IN_DEBUG;
 	} else if (!force_stop) {
 		if (esoc_clink->subsys.sysmon_shutdown_ret)
 			ret = clink_ops->cmd_exe(ESOC_FORCE_PWR_OFF,
 							esoc_clink);
 		else {
 			if (mdm_dbg_stall_cmd(ESOC_PWR_OFF))
 				/* Since power off command is masked
 				 * we return success, and leave the state
 				 * of the command engine as is.
 				 */
 				return 0;
 			ret = clink_ops->cmd_exe(ESOC_PWR_OFF, esoc_clink);
 		}
 		if (ret) {
 			dev_err(&esoc_clink->dev, "failed to exe power off\n");
 			return ret;
 		}
 		mdm_drv->mode = PWR_OFF;
 	}
 	return 0;
 }

 static int mdm_subsys_powerup(const struct subsys_desc *crashed_subsys)
 {
 	int ret;
 	struct esoc_clink *esoc_clink =
 				container_of(crashed_subsys, struct esoc_clink,
 								subsys);
 	struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink);
 	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

 	if (!esoc_req_eng_enabled(esoc_clink)) {
 		dev_dbg(&esoc_clink->dev, "Wait for req eng registration\n");
 		wait_for_completion(&mdm_drv->req_eng_wait);
 	}
 	if (mdm_drv->mode == PWR_OFF) {
 		if (mdm_dbg_stall_cmd(ESOC_PWR_ON))
 			return -EBUSY;
 		ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink);
 		if (ret) {
 			dev_err(&esoc_clink->dev, "pwr on fail\n");
 			return ret;
 		}
 	} else if (mdm_drv->mode == IN_DEBUG) {
 		ret = clink_ops->cmd_exe(ESOC_EXIT_DEBUG, esoc_clink);
 		if (ret) {
 			dev_err(&esoc_clink->dev, "cannot exit debug mode\n");
 			return ret;
 		}
 		mdm_drv->mode = PWR_OFF;
 		ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink);
 		if (ret) {
 			dev_err(&esoc_clink->dev, "pwr on fail\n");
 			return ret;
 		}
 	}
 	wait_for_completion(&mdm_drv->boot_done);
 	if (mdm_drv->boot_fail) {
 		dev_err(&esoc_clink->dev, "booting failed\n");
 		return -EIO;
 	}
 	return 0;
 }

 static int mdm_subsys_ramdumps(int want_dumps,
 				const struct subsys_desc *crashed_subsys)
 {
 	int ret;
 	struct esoc_clink *esoc_clink =
 				container_of(crashed_subsys, struct esoc_clink,
 								subsys);
 	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

 	if (want_dumps) {
 		ret = clink_ops->cmd_exe(ESOC_EXE_DEBUG, esoc_clink);
 		if (ret) {
 			dev_err(&esoc_clink->dev, "debugging failed\n");
 			return ret;
 		}
 	}
 	return 0;
 }

 static int mdm_register_ssr(struct esoc_clink *esoc_clink)
 {
 	esoc_clink->subsys.shutdown = mdm_subsys_shutdown;
 	esoc_clink->subsys.ramdump = mdm_subsys_ramdumps;
 	esoc_clink->subsys.powerup = mdm_subsys_powerup;
 	esoc_clink->subsys.crash_shutdown = mdm_crash_shutdown;
 	return esoc_clink_register_ssr(esoc_clink);
 }

 int esoc_ssr_probe(struct esoc_clink *esoc_clink, struct esoc_drv *drv)
 {
 	int ret;
 	struct mdm_drv *mdm_drv;
 	struct esoc_eng *esoc_eng;

 	mdm_drv = devm_kzalloc(&esoc_clink->dev, sizeof(*mdm_drv), GFP_KERNEL);
 	if (IS_ERR_OR_NULL(mdm_drv))
 		return PTR_ERR(mdm_drv);
 	esoc_eng = &mdm_drv->cmd_eng;
 	esoc_eng->handle_clink_evt = mdm_handle_clink_evt;
 	ret = esoc_clink_register_cmd_eng(esoc_clink, esoc_eng);
 	if (ret) {
 		dev_err(&esoc_clink->dev, "failed to register cmd engine\n");
 		return ret;
 	}
 	ret = mdm_register_ssr(esoc_clink);
 	if (ret)
 		goto ssr_err;
 	mdm_drv->mdm_queue = alloc_workqueue("mdm_drv_queue", 0, 0);
 	if (!mdm_drv->mdm_queue) {
 		dev_err(&esoc_clink->dev, "could not create mdm_queue\n");
 		goto queue_err;
 	}
 	esoc_set_drv_data(esoc_clink, mdm_drv);
 	init_completion(&mdm_drv->boot_done);
 	init_completion(&mdm_drv->req_eng_wait);
 	INIT_WORK(&mdm_drv->ssr_work, mdm_ssr_fn);
 	mdm_drv->esoc_clink = esoc_clink;
 	mdm_drv->mode = PWR_OFF;
 	mdm_drv->boot_fail = false;
 	mdm_drv->esoc_restart.notifier_call = esoc_msm_restart_handler;
 	ret = register_reboot_notifier(&mdm_drv->esoc_restart);
 	if (ret)
 		dev_err(&esoc_clink->dev, "register for reboot failed\n");
 	ret = mdm_dbg_eng_init(drv, esoc_clink);
 	if (ret) {
 		debug_init_done = false;
 		dev_err(&esoc_clink->dev, "dbg engine failure\n");
 	} else {
 		dev_dbg(&esoc_clink->dev, "dbg engine initialized\n");
 		debug_init_done = true;
 	}
 	return 0;
 queue_err:
 	esoc_clink_unregister_ssr(esoc_clink);
 ssr_err:
 	esoc_clink_unregister_cmd_eng(esoc_clink, esoc_eng);
 	return ret;
 }

 static struct esoc_compat compat_table[] = {
 	{	.name = "MDM9x25",
 		.data = NULL,
 	},
 	{
 		.name = "MDM9x35",
 		.data = NULL,
 	},
 	{
 		.name = "MDM9x55",
 		.data = NULL,
 	},
 };

 static struct esoc_drv esoc_ssr_drv = {
 	.owner = THIS_MODULE,
 	.probe = esoc_ssr_probe,
 	.compat_table = compat_table,
 	.compat_entries = ARRAY_SIZE(compat_table),
 	.driver = {
 		.name = "mdm-4x",
 	},
 };

 int __init esoc_ssr_init(void)
 {
 	return esoc_drv_register(&esoc_ssr_drv);
 }
 module_init(esoc_ssr_init);
 MODULE_LICENSE("GPL v2");
	/* Copyright (c) 2013-2017, 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/delay.h>
	#include <linux/workqueue.h>
	#include <linux/reboot.h>
	#include "esoc.h"
	#include "mdm-dbg.h"

	enum {
	PWR_OFF = 0x1,
	PWR_ON,
	BOOT,
	RUN,
	CRASH,
	IN_DEBUG,
	SHUTDOWN,
	RESET,
	PEER_CRASH,
	};

	struct mdm_drv {
	unsigned int mode;
	struct esoc_eng cmd_eng;
	struct completion boot_done;
	struct completion req_eng_wait;
	struct esoc_clink *esoc_clink;
	bool boot_fail;
	struct workqueue_struct *mdm_queue;
	struct work_struct ssr_work;
	struct notifier_block esoc_restart;
	};
	#define to_mdm_drv(d) container_of(d, struct mdm_drv, cmd_eng)

	static int esoc_msm_restart_handler(struct notifier_block *nb,
	unsigned long action, void *data)
	{
	struct mdm_drv *mdm_drv = container_of(nb, struct mdm_drv,
	esoc_restart);
	struct esoc_clink *esoc_clink = mdm_drv->esoc_clink;
	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

	if (action == SYS_RESTART) {
	if (mdm_dbg_stall_notify(ESOC_PRIMARY_REBOOT))
	return NOTIFY_OK;
	dev_dbg(&esoc_clink->dev, "Notifying esoc of cold reboot\n");
	clink_ops->notify(ESOC_PRIMARY_REBOOT, esoc_clink);
	}
	return NOTIFY_OK;
	}
	static void mdm_handle_clink_evt(enum esoc_evt evt,
	struct esoc_eng *eng)
	{
	struct mdm_drv *mdm_drv = to_mdm_drv(eng);

	switch (evt) {
	case ESOC_INVALID_STATE:
	mdm_drv->boot_fail = true;
	complete(&mdm_drv->boot_done);
	break;
	case ESOC_RUN_STATE:
	mdm_drv->boot_fail = false;
	mdm_drv->mode = RUN,
	complete(&mdm_drv->boot_done);
	break;
	case ESOC_UNEXPECTED_RESET:
	case ESOC_ERR_FATAL:
	if (mdm_drv->mode == CRASH)
	return;
	mdm_drv->mode = CRASH;
	queue_work(mdm_drv->mdm_queue, &mdm_drv->ssr_work);
	break;
	case ESOC_REQ_ENG_ON:
	complete(&mdm_drv->req_eng_wait);
	break;
	default:
	break;
	}
	}

	static void mdm_ssr_fn(struct work_struct *work)
	{
	struct mdm_drv *mdm_drv = container_of(work, struct mdm_drv, ssr_work);

	/*
	* If restarting esoc fails, the SSR framework triggers a kernel panic
	*/
	esoc_clink_request_ssr(mdm_drv->esoc_clink);
	}

	static void mdm_crash_shutdown(const struct subsys_desc *mdm_subsys)
	{
	struct esoc_clink *esoc_clink =
	container_of(mdm_subsys,
	struct esoc_clink,
	subsys);
	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

	if (mdm_dbg_stall_notify(ESOC_PRIMARY_CRASH))
	return;

	clink_ops->notify(ESOC_PRIMARY_CRASH, esoc_clink);
	}

	static int mdm_subsys_shutdown(const struct subsys_desc *crashed_subsys,
	bool force_stop)
	{
	int ret;
	struct esoc_clink *esoc_clink =
	container_of(crashed_subsys, struct esoc_clink, subsys);
	struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink);
	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

	if (mdm_drv->mode == CRASH \|\| mdm_drv->mode == PEER_CRASH) {
	if (mdm_dbg_stall_cmd(ESOC_PREPARE_DEBUG))
	/* We want to mask debug command.
	* In this case return success
	* to move to next stage
	*/
	return 0;
	ret = clink_ops->cmd_exe(ESOC_PREPARE_DEBUG,
	esoc_clink);
	if (ret) {
	dev_err(&esoc_clink->dev, "failed to enter debug\n");
	return ret;
	}
	mdm_drv->mode = IN_DEBUG;
	} else if (!force_stop) {
	if (esoc_clink->subsys.sysmon_shutdown_ret)
	ret = clink_ops->cmd_exe(ESOC_FORCE_PWR_OFF,
	esoc_clink);
	else {
	if (mdm_dbg_stall_cmd(ESOC_PWR_OFF))
	/* Since power off command is masked
	* we return success, and leave the state
	* of the command engine as is.
	*/
	return 0;
	ret = clink_ops->cmd_exe(ESOC_PWR_OFF, esoc_clink);
	}
	if (ret) {
	dev_err(&esoc_clink->dev, "failed to exe power off\n");
	return ret;
	}
	mdm_drv->mode = PWR_OFF;
	}
	return 0;
	}

	static int mdm_subsys_powerup(const struct subsys_desc *crashed_subsys)
	{
	int ret;
	struct esoc_clink *esoc_clink =
	container_of(crashed_subsys, struct esoc_clink,
	subsys);
	struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink);
	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

	if (!esoc_req_eng_enabled(esoc_clink)) {
	dev_dbg(&esoc_clink->dev, "Wait for req eng registration\n");
	wait_for_completion(&mdm_drv->req_eng_wait);
	}
	if (mdm_drv->mode == PWR_OFF) {
	if (mdm_dbg_stall_cmd(ESOC_PWR_ON))
	return -EBUSY;
	ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink);
	if (ret) {
	dev_err(&esoc_clink->dev, "pwr on fail\n");
	return ret;
	}
	} else if (mdm_drv->mode == IN_DEBUG) {
	ret = clink_ops->cmd_exe(ESOC_EXIT_DEBUG, esoc_clink);
	if (ret) {
	dev_err(&esoc_clink->dev, "cannot exit debug mode\n");
	return ret;
	}
	mdm_drv->mode = PWR_OFF;
	ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink);
	if (ret) {
	dev_err(&esoc_clink->dev, "pwr on fail\n");
	return ret;
	}
	}
	wait_for_completion(&mdm_drv->boot_done);
	if (mdm_drv->boot_fail) {
	dev_err(&esoc_clink->dev, "booting failed\n");
	return -EIO;
	}
	return 0;
	}

	static int mdm_subsys_ramdumps(int want_dumps,
	const struct subsys_desc *crashed_subsys)
	{
	int ret;
	struct esoc_clink *esoc_clink =
	container_of(crashed_subsys, struct esoc_clink,
	subsys);
	const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;

	if (want_dumps) {
	ret = clink_ops->cmd_exe(ESOC_EXE_DEBUG, esoc_clink);
	if (ret) {
	dev_err(&esoc_clink->dev, "debugging failed\n");
	return ret;
	}
	}
	return 0;
	}

	static int mdm_register_ssr(struct esoc_clink *esoc_clink)
	{
	esoc_clink->subsys.shutdown = mdm_subsys_shutdown;
	esoc_clink->subsys.ramdump = mdm_subsys_ramdumps;
	esoc_clink->subsys.powerup = mdm_subsys_powerup;
	esoc_clink->subsys.crash_shutdown = mdm_crash_shutdown;
	return esoc_clink_register_ssr(esoc_clink);
	}

	int esoc_ssr_probe(struct esoc_clink esoc_clink, struct esoc_drv drv)
	{
	int ret;
	struct mdm_drv *mdm_drv;
	struct esoc_eng *esoc_eng;

	mdm_drv = devm_kzalloc(&esoc_clink->dev, sizeof(*mdm_drv), GFP_KERNEL);
	if (IS_ERR_OR_NULL(mdm_drv))
	return PTR_ERR(mdm_drv);
	esoc_eng = &mdm_drv->cmd_eng;
	esoc_eng->handle_clink_evt = mdm_handle_clink_evt;
	ret = esoc_clink_register_cmd_eng(esoc_clink, esoc_eng);
	if (ret) {
	dev_err(&esoc_clink->dev, "failed to register cmd engine\n");
	return ret;
	}
	ret = mdm_register_ssr(esoc_clink);
	if (ret)
	goto ssr_err;
	mdm_drv->mdm_queue = alloc_workqueue("mdm_drv_queue", 0, 0);
	if (!mdm_drv->mdm_queue) {
	dev_err(&esoc_clink->dev, "could not create mdm_queue\n");
	goto queue_err;
	}
	esoc_set_drv_data(esoc_clink, mdm_drv);
	init_completion(&mdm_drv->boot_done);
	init_completion(&mdm_drv->req_eng_wait);
	INIT_WORK(&mdm_drv->ssr_work, mdm_ssr_fn);
	mdm_drv->esoc_clink = esoc_clink;
	mdm_drv->mode = PWR_OFF;
	mdm_drv->boot_fail = false;
	mdm_drv->esoc_restart.notifier_call = esoc_msm_restart_handler;
	ret = register_reboot_notifier(&mdm_drv->esoc_restart);
	if (ret)
	dev_err(&esoc_clink->dev, "register for reboot failed\n");
	ret = mdm_dbg_eng_init(drv, esoc_clink);
	if (ret) {
	debug_init_done = false;
	dev_err(&esoc_clink->dev, "dbg engine failure\n");
	} else {
	dev_dbg(&esoc_clink->dev, "dbg engine initialized\n");
	debug_init_done = true;
	}
	return 0;
	queue_err:
	esoc_clink_unregister_ssr(esoc_clink);
	ssr_err:
	esoc_clink_unregister_cmd_eng(esoc_clink, esoc_eng);
	return ret;
	}

	static struct esoc_compat compat_table[] = {
	{ .name = "MDM9x25",
	.data = NULL,
	},
	{
	.name = "MDM9x35",
	.data = NULL,
	},
	{
	.name = "MDM9x55",
	.data = NULL,
	},
	};

	static struct esoc_drv esoc_ssr_drv = {
	.owner = THIS_MODULE,
	.probe = esoc_ssr_probe,
	.compat_table = compat_table,
	.compat_entries = ARRAY_SIZE(compat_table),
	.driver = {
	.name = "mdm-4x",
	},
	};

	int __init esoc_ssr_init(void)
	{
	return esoc_drv_register(&esoc_ssr_drv);
	}
	module_init(esoc_ssr_init);
	MODULE_LICENSE("GPL v2");