drivers/remoteproc/qcom_common.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Qualcomm Peripheral Image Loader helpers
  *
  * Copyright (C) 2016 Linaro Ltd
  * Copyright (C) 2015 Sony Mobile Communications Inc
  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
  */

 #include <linux/firmware.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/notifier.h>
 #include <linux/remoteproc.h>
 #include <linux/remoteproc/qcom_rproc.h>
 #include <linux/rpmsg/qcom_glink.h>
 #include <linux/rpmsg/qcom_smd.h>
 #include <linux/slab.h>
 #include <linux/soc/qcom/mdt_loader.h>

 #include "remoteproc_internal.h"
 #include "qcom_common.h"

 #define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
 #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
 #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)

 struct qcom_ssr_subsystem {
 	const char *name;
 	struct srcu_notifier_head notifier_list;
 	struct list_head list;
 };

 static LIST_HEAD(qcom_ssr_subsystem_list);
 static DEFINE_MUTEX(qcom_ssr_subsys_lock);

 static int glink_subdev_start(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);

 	glink->edge = qcom_glink_smem_register(glink->dev, glink->node);

 	return PTR_ERR_OR_ZERO(glink->edge);
 }

 static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
 {
 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);

 	qcom_glink_smem_unregister(glink->edge);
 	glink->edge = NULL;
 }

 static void glink_subdev_unprepare(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);

 	qcom_glink_ssr_notify(glink->ssr_name);
 }

 /**
  * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
  * @rproc:	rproc handle to parent the subdevice
  * @glink:	reference to a GLINK subdev context
  * @ssr_name:	identifier of the associated remoteproc for ssr notifications
  */
 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
 			   const char *ssr_name)
 {
 	struct device *dev = &rproc->dev;

 	glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
 	if (!glink->node)
 		return;

 	glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
 	if (!glink->ssr_name)
 		return;

 	glink->dev = dev;
 	glink->subdev.start = glink_subdev_start;
 	glink->subdev.stop = glink_subdev_stop;
 	glink->subdev.unprepare = glink_subdev_unprepare;

 	rproc_add_subdev(rproc, &glink->subdev);
 }
 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);

 /**
  * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
  * @rproc:	rproc handle
  * @glink:	reference to a GLINK subdev context
  */
 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
 {
 	if (!glink->node)
 		return;

 	rproc_remove_subdev(rproc, &glink->subdev);
 	kfree_const(glink->ssr_name);
 	of_node_put(glink->node);
 }
 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);

 /**
  * qcom_register_dump_segments() - register segments for coredump
  * @rproc:	remoteproc handle
  * @fw:		firmware header
  *
  * Register all segments of the ELF in the remoteproc coredump segment list
  *
  * Return: 0 on success, negative errno on failure.
  */
 int qcom_register_dump_segments(struct rproc *rproc,
 				const struct firmware *fw)
 {
 	const struct elf32_phdr *phdrs;
 	const struct elf32_phdr *phdr;
 	const struct elf32_hdr *ehdr;
 	int ret;
 	int i;

 	ehdr = (struct elf32_hdr *)fw->data;
 	phdrs = (struct elf32_phdr *)(ehdr + 1);

 	for (i = 0; i < ehdr->e_phnum; i++) {
 		phdr = &phdrs[i];

 		if (phdr->p_type != PT_LOAD)
 			continue;

 		if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
 			continue;

 		if (!phdr->p_memsz)
 			continue;

 		ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
 						 phdr->p_memsz);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(qcom_register_dump_segments);

 static int smd_subdev_start(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);

 	smd->edge = qcom_smd_register_edge(smd->dev, smd->node);

 	return PTR_ERR_OR_ZERO(smd->edge);
 }

 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
 {
 	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);

 	qcom_smd_unregister_edge(smd->edge);
 	smd->edge = NULL;
 }

 /**
  * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
  * @rproc:	rproc handle to parent the subdevice
  * @smd:	reference to a Qualcomm subdev context
  */
 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 {
 	struct device *dev = &rproc->dev;

 	smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
 	if (!smd->node)
 		return;

 	smd->dev = dev;
 	smd->subdev.start = smd_subdev_start;
 	smd->subdev.stop = smd_subdev_stop;

 	rproc_add_subdev(rproc, &smd->subdev);
 }
 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);

 /**
  * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
  * @rproc:	rproc handle
  * @smd:	the SMD subdevice to remove
  */
 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 {
 	if (!smd->node)
 		return;

 	rproc_remove_subdev(rproc, &smd->subdev);
 	of_node_put(smd->node);
 }
 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);

 static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
 {
 	struct qcom_ssr_subsystem *info;

 	mutex_lock(&qcom_ssr_subsys_lock);
 	/* Match in the global qcom_ssr_subsystem_list with name */
 	list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
 		if (!strcmp(info->name, name))
 			goto out;

 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		info = ERR_PTR(-ENOMEM);
 		goto out;
 	}
 	info->name = kstrdup_const(name, GFP_KERNEL);
 	srcu_init_notifier_head(&info->notifier_list);

 	/* Add to global notification list */
 	list_add_tail(&info->list, &qcom_ssr_subsystem_list);

 out:
 	mutex_unlock(&qcom_ssr_subsys_lock);
 	return info;
 }

 /**
  * qcom_register_ssr_notifier() - register SSR notification handler
  * @name:	Subsystem's SSR name
  * @nb:		notifier_block to be invoked upon subsystem's state change
  *
  * This registers the @nb notifier block as part the notifier chain for a
  * remoteproc associated with @name. The notifier block's callback
  * will be invoked when the remote processor's SSR events occur
  * (pre/post startup and pre/post shutdown).
  *
  * Return: a subsystem cookie on success, ERR_PTR on failure.
  */
 void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
 {
 	struct qcom_ssr_subsystem *info;

 	info = qcom_ssr_get_subsys(name);
 	if (IS_ERR(info))
 		return info;

 	srcu_notifier_chain_register(&info->notifier_list, nb);

 	return &info->notifier_list;
 }
 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);

 /**
  * qcom_unregister_ssr_notifier() - unregister SSR notification handler
  * @notify:	subsystem cookie returned from qcom_register_ssr_notifier
  * @nb:		notifier_block to unregister
  *
  * This function will unregister the notifier from the particular notifier
  * chain.
  *
  * Return: 0 on success, %ENOENT otherwise.
  */
 int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
 {
 	return srcu_notifier_chain_unregister(notify, nb);
 }
 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);

 static int ssr_notify_prepare(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
 	struct qcom_ssr_notify_data data = {
 		.name = ssr->info->name,
 		.crashed = false,
 	};

 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_BEFORE_POWERUP, &data);
 	return 0;
 }

 static int ssr_notify_start(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
 	struct qcom_ssr_notify_data data = {
 		.name = ssr->info->name,
 		.crashed = false,
 	};

 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_AFTER_POWERUP, &data);
 	return 0;
 }

 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
 {
 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
 	struct qcom_ssr_notify_data data = {
 		.name = ssr->info->name,
 		.crashed = crashed,
 	};

 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_BEFORE_SHUTDOWN, &data);
 }

 static void ssr_notify_unprepare(struct rproc_subdev *subdev)
 {
 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
 	struct qcom_ssr_notify_data data = {
 		.name = ssr->info->name,
 		.crashed = false,
 	};

 	srcu_notifier_call_chain(&ssr->info->notifier_list,
 				 QCOM_SSR_AFTER_SHUTDOWN, &data);
 }

 /**
  * qcom_add_ssr_subdev() - register subdevice as restart notification source
  * @rproc:	rproc handle
  * @ssr:	SSR subdevice handle
  * @ssr_name:	identifier to use for notifications originating from @rproc
  *
  * As the @ssr is registered with the @rproc SSR events will be sent to all
  * registered listeners for the remoteproc when it's SSR events occur
  * (pre/post startup and pre/post shutdown).
  */
 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
 			 const char *ssr_name)
 {
 	struct qcom_ssr_subsystem *info;

 	info = qcom_ssr_get_subsys(ssr_name);
 	if (IS_ERR(info)) {
 		dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
 		return;
 	}

 	ssr->info = info;
 	ssr->subdev.prepare = ssr_notify_prepare;
 	ssr->subdev.start = ssr_notify_start;
 	ssr->subdev.stop = ssr_notify_stop;
 	ssr->subdev.unprepare = ssr_notify_unprepare;

 	rproc_add_subdev(rproc, &ssr->subdev);
 }
 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);

 /**
  * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
  * @rproc:	rproc handle
  * @ssr:	SSR subdevice handle
  */
 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
 {
 	rproc_remove_subdev(rproc, &ssr->subdev);
 	ssr->info = NULL;
 }
 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);

 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Qualcomm Peripheral Image Loader helpers
	*
	* Copyright (C) 2016 Linaro Ltd
	* Copyright (C) 2015 Sony Mobile Communications Inc
	* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
	*/

	#include <linux/firmware.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/notifier.h>
	#include <linux/remoteproc.h>
	#include <linux/remoteproc/qcom_rproc.h>
	#include <linux/rpmsg/qcom_glink.h>
	#include <linux/rpmsg/qcom_smd.h>
	#include <linux/slab.h>
	#include <linux/soc/qcom/mdt_loader.h>

	#include "remoteproc_internal.h"
	#include "qcom_common.h"

	#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
	#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
	#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)

	struct qcom_ssr_subsystem {
	const char *name;
	struct srcu_notifier_head notifier_list;
	struct list_head list;
	};

	static LIST_HEAD(qcom_ssr_subsystem_list);
	static DEFINE_MUTEX(qcom_ssr_subsys_lock);

	static int glink_subdev_start(struct rproc_subdev *subdev)
	{
	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);

	glink->edge = qcom_glink_smem_register(glink->dev, glink->node);

	return PTR_ERR_OR_ZERO(glink->edge);
	}

	static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
	{
	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);

	qcom_glink_smem_unregister(glink->edge);
	glink->edge = NULL;
	}

	static void glink_subdev_unprepare(struct rproc_subdev *subdev)
	{
	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);

	qcom_glink_ssr_notify(glink->ssr_name);
	}

	/**
	* qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
	* @rproc: rproc handle to parent the subdevice
	* @glink: reference to a GLINK subdev context
	* @ssr_name: identifier of the associated remoteproc for ssr notifications
	*/
	void qcom_add_glink_subdev(struct rproc rproc, struct qcom_rproc_glink glink,
	const char *ssr_name)
	{
	struct device *dev = &rproc->dev;

	glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
	if (!glink->node)
	return;

	glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
	if (!glink->ssr_name)
	return;

	glink->dev = dev;
	glink->subdev.start = glink_subdev_start;
	glink->subdev.stop = glink_subdev_stop;
	glink->subdev.unprepare = glink_subdev_unprepare;

	rproc_add_subdev(rproc, &glink->subdev);
	}
	EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);

	/**
	* qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
	* @rproc: rproc handle
	* @glink: reference to a GLINK subdev context
	*/
	void qcom_remove_glink_subdev(struct rproc rproc, struct qcom_rproc_glink glink)
	{
	if (!glink->node)
	return;

	rproc_remove_subdev(rproc, &glink->subdev);
	kfree_const(glink->ssr_name);
	of_node_put(glink->node);
	}
	EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);

	/**
	* qcom_register_dump_segments() - register segments for coredump
	* @rproc: remoteproc handle
	* @fw: firmware header
	*
	* Register all segments of the ELF in the remoteproc coredump segment list
	*
	* Return: 0 on success, negative errno on failure.
	*/
	int qcom_register_dump_segments(struct rproc *rproc,
	const struct firmware *fw)
	{
	const struct elf32_phdr *phdrs;
	const struct elf32_phdr *phdr;
	const struct elf32_hdr *ehdr;
	int ret;
	int i;

	ehdr = (struct elf32_hdr *)fw->data;
	phdrs = (struct elf32_phdr *)(ehdr + 1);

	for (i = 0; i < ehdr->e_phnum; i++) {
	phdr = &phdrs[i];

	if (phdr->p_type != PT_LOAD)
	continue;

	if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
	continue;

	if (!phdr->p_memsz)
	continue;

	ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
	phdr->p_memsz);
	if (ret)
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(qcom_register_dump_segments);

	static int smd_subdev_start(struct rproc_subdev *subdev)
	{
	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);

	smd->edge = qcom_smd_register_edge(smd->dev, smd->node);

	return PTR_ERR_OR_ZERO(smd->edge);
	}

	static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
	{
	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);

	qcom_smd_unregister_edge(smd->edge);
	smd->edge = NULL;
	}

	/**
	* qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
	* @rproc: rproc handle to parent the subdevice
	* @smd: reference to a Qualcomm subdev context
	*/
	void qcom_add_smd_subdev(struct rproc rproc, struct qcom_rproc_subdev smd)
	{
	struct device *dev = &rproc->dev;

	smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
	if (!smd->node)
	return;

	smd->dev = dev;
	smd->subdev.start = smd_subdev_start;
	smd->subdev.stop = smd_subdev_stop;

	rproc_add_subdev(rproc, &smd->subdev);
	}
	EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);

	/**
	* qcom_remove_smd_subdev() - remove the smd subdevice from rproc
	* @rproc: rproc handle
	* @smd: the SMD subdevice to remove
	*/
	void qcom_remove_smd_subdev(struct rproc rproc, struct qcom_rproc_subdev smd)
	{
	if (!smd->node)
	return;

	rproc_remove_subdev(rproc, &smd->subdev);
	of_node_put(smd->node);
	}
	EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);

	static struct qcom_ssr_subsystem qcom_ssr_get_subsys(const char name)
	{
	struct qcom_ssr_subsystem *info;

	mutex_lock(&qcom_ssr_subsys_lock);
	/* Match in the global qcom_ssr_subsystem_list with name */
	list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
	if (!strcmp(info->name, name))
	goto out;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
	info = ERR_PTR(-ENOMEM);
	goto out;
	}
	info->name = kstrdup_const(name, GFP_KERNEL);
	srcu_init_notifier_head(&info->notifier_list);

	/* Add to global notification list */
	list_add_tail(&info->list, &qcom_ssr_subsystem_list);

	out:
	mutex_unlock(&qcom_ssr_subsys_lock);
	return info;
	}

	/**
	* qcom_register_ssr_notifier() - register SSR notification handler
	* @name: Subsystem's SSR name
	* @nb: notifier_block to be invoked upon subsystem's state change
	*
	* This registers the @nb notifier block as part the notifier chain for a
	* remoteproc associated with @name. The notifier block's callback
	* will be invoked when the remote processor's SSR events occur
	* (pre/post startup and pre/post shutdown).
	*
	* Return: a subsystem cookie on success, ERR_PTR on failure.
	*/
	void qcom_register_ssr_notifier(const char name, struct notifier_block *nb)
	{
	struct qcom_ssr_subsystem *info;

	info = qcom_ssr_get_subsys(name);
	if (IS_ERR(info))
	return info;

	srcu_notifier_chain_register(&info->notifier_list, nb);

	return &info->notifier_list;
	}
	EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);

	/**
	* qcom_unregister_ssr_notifier() - unregister SSR notification handler
	* @notify: subsystem cookie returned from qcom_register_ssr_notifier
	* @nb: notifier_block to unregister
	*
	* This function will unregister the notifier from the particular notifier
	* chain.
	*
	* Return: 0 on success, %ENOENT otherwise.
	*/
	int qcom_unregister_ssr_notifier(void notify, struct notifier_block nb)
	{
	return srcu_notifier_chain_unregister(notify, nb);
	}
	EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);

	static int ssr_notify_prepare(struct rproc_subdev *subdev)
	{
	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
	struct qcom_ssr_notify_data data = {
	.name = ssr->info->name,
	.crashed = false,
	};

	srcu_notifier_call_chain(&ssr->info->notifier_list,
	QCOM_SSR_BEFORE_POWERUP, &data);
	return 0;
	}

	static int ssr_notify_start(struct rproc_subdev *subdev)
	{
	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
	struct qcom_ssr_notify_data data = {
	.name = ssr->info->name,
	.crashed = false,
	};

	srcu_notifier_call_chain(&ssr->info->notifier_list,
	QCOM_SSR_AFTER_POWERUP, &data);
	return 0;
	}

	static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
	{
	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
	struct qcom_ssr_notify_data data = {
	.name = ssr->info->name,
	.crashed = crashed,
	};

	srcu_notifier_call_chain(&ssr->info->notifier_list,
	QCOM_SSR_BEFORE_SHUTDOWN, &data);
	}

	static void ssr_notify_unprepare(struct rproc_subdev *subdev)
	{
	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
	struct qcom_ssr_notify_data data = {
	.name = ssr->info->name,
	.crashed = false,
	};

	srcu_notifier_call_chain(&ssr->info->notifier_list,
	QCOM_SSR_AFTER_SHUTDOWN, &data);
	}

	/**
	* qcom_add_ssr_subdev() - register subdevice as restart notification source
	* @rproc: rproc handle
	* @ssr: SSR subdevice handle
	* @ssr_name: identifier to use for notifications originating from @rproc
	*
	* As the @ssr is registered with the @rproc SSR events will be sent to all
	* registered listeners for the remoteproc when it's SSR events occur
	* (pre/post startup and pre/post shutdown).
	*/
	void qcom_add_ssr_subdev(struct rproc rproc, struct qcom_rproc_ssr ssr,
	const char *ssr_name)
	{
	struct qcom_ssr_subsystem *info;

	info = qcom_ssr_get_subsys(ssr_name);
	if (IS_ERR(info)) {
	dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
	return;
	}

	ssr->info = info;
	ssr->subdev.prepare = ssr_notify_prepare;
	ssr->subdev.start = ssr_notify_start;
	ssr->subdev.stop = ssr_notify_stop;
	ssr->subdev.unprepare = ssr_notify_unprepare;

	rproc_add_subdev(rproc, &ssr->subdev);
	}
	EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);

	/**
	* qcom_remove_ssr_subdev() - remove subdevice as restart notification source
	* @rproc: rproc handle
	* @ssr: SSR subdevice handle
	*/
	void qcom_remove_ssr_subdev(struct rproc rproc, struct qcom_rproc_ssr ssr)
	{
	rproc_remove_subdev(rproc, &ssr->subdev);
	ssr->info = NULL;
	}
	EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);

	MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
	MODULE_LICENSE("GPL v2");