drivers/hwtracing/coresight/coresight-remote-etm.c - manifest_repos/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/sysfs.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/coresight.h>
 #include "coresight-qmi.h"

 #define REMOTE_ETM_TRACE_ID_START	192

 #ifdef CONFIG_CORESIGHT_REMOTE_ETM_DEFAULT_ENABLE
 static int boot_enable = CONFIG_CORESIGHT_REMOTE_ETM_DEFAULT_ENABLE;
 #else
 static int boot_enable;
 #endif

 DEFINE_CORESIGHT_DEVLIST(remote_etm_devs, "remote-etm");

 struct remote_etm_drvdata {
 	struct device			*dev;
 	struct coresight_device		*csdev;
 	struct mutex			mutex;
 	struct qmi_handle		handle;
 	uint32_t			inst_id;
 	bool				enable;
 	int				traceid;
 	bool service_connected;
 	struct sockaddr_qrtr s_addr;
 };

 static int service_remote_etm_new_server(struct qmi_handle *qmi,
 		struct qmi_service *svc)
 {
 	struct remote_etm_drvdata *drvdata = container_of(qmi,
 					struct remote_etm_drvdata, handle);

 	drvdata->s_addr.sq_family = AF_QIPCRTR;
 	drvdata->s_addr.sq_node = svc->node;
 	drvdata->s_addr.sq_port = svc->port;
 	drvdata->service_connected = true;
 	dev_info(drvdata->dev,
 		"Connection established between QMI handle and %d service\n",
 		drvdata->inst_id);

 	return 0;
 }

 static void service_remote_etm_del_server(struct qmi_handle *qmi,
 		struct qmi_service *svc)
 {
 	struct remote_etm_drvdata *drvdata = container_of(qmi,
 					struct remote_etm_drvdata, handle);
 	drvdata->service_connected = false;
 	dev_info(drvdata->dev,
 		"Connection disconnected between QMI handle and %d service\n",
 		drvdata->inst_id);
 }

 static struct qmi_ops server_ops = {
 	.new_server = service_remote_etm_new_server,
 	.del_server = service_remote_etm_del_server,
 };

 static int remote_etm_enable(struct coresight_device *csdev,
 			     struct perf_event *event, u32 mode)
 {
 	struct remote_etm_drvdata *drvdata =
 		dev_get_drvdata(csdev->dev.parent);
 	struct coresight_set_etm_req_msg_v01 req;
 	struct coresight_set_etm_resp_msg_v01 resp = { { 0, 0 } };
 	struct qmi_txn txn;
 	int ret;

 	mutex_lock(&drvdata->mutex);

 	if (!drvdata->service_connected) {
 		dev_err(drvdata->dev, "QMI service not connected!\n");
 		ret = EINVAL;
 		goto err;
 	}
 	/*
 	 * The QMI handle may be NULL in the following scenarios:
 	 * 1. QMI service is not present
 	 * 2. QMI service is present but attempt to enable remote ETM is earlier
 	 *    than service is ready to handle request
 	 * 3. Connection between QMI client and QMI service failed
 	 *
 	 * Enable CoreSight without processing further QMI commands which
 	 * provides the option to enable remote ETM by other means.
 	 */
 	req.state = CORESIGHT_ETM_STATE_ENABLED_V01;

 	ret = qmi_txn_init(&drvdata->handle, &txn,
 			coresight_set_etm_resp_msg_v01_ei,
 			&resp);

 	if (ret < 0) {
 		dev_err(drvdata->dev, "QMI tx init failed , ret:%d\n",
 				ret);
 		goto err;
 	}

 	ret = qmi_send_request(&drvdata->handle, &drvdata->s_addr,
 			&txn, CORESIGHT_QMI_SET_ETM_REQ_V01,
 			CORESIGHT_QMI_SET_ETM_REQ_MAX_LEN,
 			coresight_set_etm_req_msg_v01_ei,
 			&req);
 	if (ret < 0) {
 		dev_err(drvdata->dev, "QMI send ACK failed, ret:%d\n",
 				ret);
 		qmi_txn_cancel(&txn);
 		goto err;
 	}

 	ret = qmi_txn_wait(&txn, msecs_to_jiffies(TIMEOUT_MS));
 	if (ret < 0) {
 		dev_err(drvdata->dev, "QMI qmi txn wait failed, ret:%d\n",
 				ret);
 		goto err;
 	}

 	/* Check the response */
 	if (resp.resp.result != QMI_RESULT_SUCCESS_V01)
 		dev_err(drvdata->dev, "QMI request failed 0x%x\n",
 				resp.resp.error);

 	drvdata->enable = true;
 	mutex_unlock(&drvdata->mutex);

 	dev_info(drvdata->dev, "Remote ETM tracing enabled for instance %d\n",
 				drvdata->inst_id);
 	return 0;
 err:
 	mutex_unlock(&drvdata->mutex);
 	return ret;
 }

 static void remote_etm_disable(struct coresight_device *csdev,
 			       struct perf_event *event)
 {
 	struct remote_etm_drvdata *drvdata =
 		 dev_get_drvdata(csdev->dev.parent);
 	struct coresight_set_etm_req_msg_v01 req;
 	struct coresight_set_etm_resp_msg_v01 resp = { { 0, 0 } };
 	struct qmi_txn txn;
 	int ret;

 	mutex_lock(&drvdata->mutex);
 	if (!drvdata->service_connected) {
 		dev_err(drvdata->dev, "QMI service not connected!\n");
 		goto err;
 	}

 	req.state = CORESIGHT_ETM_STATE_DISABLED_V01;

 	ret = qmi_txn_init(&drvdata->handle, &txn,
 			coresight_set_etm_resp_msg_v01_ei,
 			&resp);

 	if (ret < 0) {
 		dev_err(drvdata->dev, "QMI tx init failed , ret:%d\n",
 				ret);
 		goto err;
 	}

 	ret = qmi_send_request(&drvdata->handle, &drvdata->s_addr,
 			&txn, CORESIGHT_QMI_SET_ETM_REQ_V01,
 			CORESIGHT_QMI_SET_ETM_REQ_MAX_LEN,
 			coresight_set_etm_req_msg_v01_ei,
 			&req);
 	if (ret < 0) {
 		dev_err(drvdata->dev, "QMI send req failed, ret:%d\n",
 				 ret);
 		qmi_txn_cancel(&txn);
 		goto err;
 	}

 	ret = qmi_txn_wait(&txn, msecs_to_jiffies(TIMEOUT_MS));
 	if (ret < 0) {
 		dev_err(drvdata->dev, "QMI qmi txn wait failed, ret:%d\n",
 				ret);
 		goto err;
 	}

 	/* Check the response */
 	if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
 		dev_err(drvdata->dev, "QMI request failed 0x%x\n",
 				resp.resp.error);
 		goto err;
 	}

 	drvdata->enable = false;
 	dev_info(drvdata->dev, "Remote ETM tracing disabled for instance %d\n",
 				drvdata->inst_id);
 err:
 	mutex_unlock(&drvdata->mutex);
 }

 static int remote_etm_trace_id(struct coresight_device *csdev)
 {
 	struct remote_etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

 	return drvdata->traceid;
 }

 static const struct coresight_ops_source remote_etm_source_ops = {
 	.trace_id	= remote_etm_trace_id,
 	.enable		= remote_etm_enable,
 	.disable	= remote_etm_disable,
 };

 static const struct coresight_ops remote_cs_ops = {
 	.source_ops	= &remote_etm_source_ops,
 };

 static int remote_etm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct coresight_platform_data *pdata;
 	struct remote_etm_drvdata *drvdata;
 	struct coresight_desc desc = {0 };
 	int ret;
 	static int traceid = REMOTE_ETM_TRACE_ID_START;

 	desc.name = coresight_alloc_device_name(&remote_etm_devs, dev);
 	if (!desc.name)
 		return -ENOMEM;
 	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 	pdev->dev.platform_data = pdata;

 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;

 	drvdata->dev = &pdev->dev;
 	platform_set_drvdata(pdev, drvdata);

 	ret = of_property_read_u32(pdev->dev.of_node, "qcom,inst-id",
 			&drvdata->inst_id);
 	if (ret)
 		return ret;

 	mutex_init(&drvdata->mutex);

 	ret = qmi_handle_init(&drvdata->handle,
 			CORESIGHT_QMI_SET_ETM_REQ_MAX_LEN,
 			&server_ops, NULL);
 	if (ret < 0) {
 		dev_err(dev, "Remote ETM client init failed ret:%d\n", ret);
 		return ret;
 	}

 	qmi_add_lookup(&drvdata->handle,
 			CORESIGHT_QMI_SVC_ID,
 			CORESIGHT_QMI_VERSION,
 			drvdata->inst_id);

 	drvdata->traceid = traceid++;

 	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
 	desc.ops = &remote_cs_ops;
 	desc.pdata = pdev->dev.platform_data;
 	desc.dev = &pdev->dev;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
 		goto err;
 	}
 	dev_info(dev, "Remote ETM initialized\n");

 	if (drvdata->inst_id >= sizeof(int)*BITS_PER_BYTE)
 		dev_err(dev, "inst_id greater than boot_enable bit mask\n");
 	else if (boot_enable & BIT(drvdata->inst_id))
 		coresight_enable(drvdata->csdev);

 	return 0;
 err:
 	qmi_handle_release(&drvdata->handle);
 	return ret;
 }

 static int remote_etm_remove(struct platform_device *pdev)
 {
 	struct remote_etm_drvdata *drvdata = platform_get_drvdata(pdev);

 	qmi_handle_release(&drvdata->handle);
 	coresight_unregister(drvdata->csdev);
 	return 0;
 }

 static const struct of_device_id remote_etm_match[] = {
 	{.compatible = "qcom,coresight-remote-etm"},
 	{}
 };

 static struct platform_driver remote_etm_driver = {
 	.probe          = remote_etm_probe,
 	.remove         = remote_etm_remove,
 	.driver         = {
 		.name   = "coresight-remote-etm",
 		.of_match_table = remote_etm_match,
 	},
 };

 int __init remote_etm_init(void)
 {
 	return platform_driver_register(&remote_etm_driver);
 }
 module_init(remote_etm_init);

 void __exit remote_etm_exit(void)
 {
 	platform_driver_unregister(&remote_etm_driver);
 }
 module_exit(remote_etm_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("CoreSight Remote ETM driver");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <linux/sysfs.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/coresight.h>
	#include "coresight-qmi.h"

	#define REMOTE_ETM_TRACE_ID_START 192

	#ifdef CONFIG_CORESIGHT_REMOTE_ETM_DEFAULT_ENABLE
	static int boot_enable = CONFIG_CORESIGHT_REMOTE_ETM_DEFAULT_ENABLE;
	#else
	static int boot_enable;
	#endif

	DEFINE_CORESIGHT_DEVLIST(remote_etm_devs, "remote-etm");

	struct remote_etm_drvdata {
	struct device *dev;
	struct coresight_device *csdev;
	struct mutex mutex;
	struct qmi_handle handle;
	uint32_t inst_id;
	bool enable;
	int traceid;
	bool service_connected;
	struct sockaddr_qrtr s_addr;
	};

	static int service_remote_etm_new_server(struct qmi_handle *qmi,
	struct qmi_service *svc)
	{
	struct remote_etm_drvdata *drvdata = container_of(qmi,
	struct remote_etm_drvdata, handle);

	drvdata->s_addr.sq_family = AF_QIPCRTR;
	drvdata->s_addr.sq_node = svc->node;
	drvdata->s_addr.sq_port = svc->port;
	drvdata->service_connected = true;
	dev_info(drvdata->dev,
	"Connection established between QMI handle and %d service\n",
	drvdata->inst_id);

	return 0;
	}

	static void service_remote_etm_del_server(struct qmi_handle *qmi,
	struct qmi_service *svc)
	{
	struct remote_etm_drvdata *drvdata = container_of(qmi,
	struct remote_etm_drvdata, handle);
	drvdata->service_connected = false;
	dev_info(drvdata->dev,
	"Connection disconnected between QMI handle and %d service\n",
	drvdata->inst_id);
	}

	static struct qmi_ops server_ops = {
	.new_server = service_remote_etm_new_server,
	.del_server = service_remote_etm_del_server,
	};

	static int remote_etm_enable(struct coresight_device *csdev,
	struct perf_event *event, u32 mode)
	{
	struct remote_etm_drvdata *drvdata =
	dev_get_drvdata(csdev->dev.parent);
	struct coresight_set_etm_req_msg_v01 req;
	struct coresight_set_etm_resp_msg_v01 resp = { { 0, 0 } };
	struct qmi_txn txn;
	int ret;

	mutex_lock(&drvdata->mutex);

	if (!drvdata->service_connected) {
	dev_err(drvdata->dev, "QMI service not connected!\n");
	ret = EINVAL;
	goto err;
	}
	/*
	* The QMI handle may be NULL in the following scenarios:
	* 1. QMI service is not present
	* 2. QMI service is present but attempt to enable remote ETM is earlier
	* than service is ready to handle request
	* 3. Connection between QMI client and QMI service failed
	*
	* Enable CoreSight without processing further QMI commands which
	* provides the option to enable remote ETM by other means.
	*/
	req.state = CORESIGHT_ETM_STATE_ENABLED_V01;

	ret = qmi_txn_init(&drvdata->handle, &txn,
	coresight_set_etm_resp_msg_v01_ei,
	&resp);

	if (ret < 0) {
	dev_err(drvdata->dev, "QMI tx init failed , ret:%d\n",
	ret);
	goto err;
	}

	ret = qmi_send_request(&drvdata->handle, &drvdata->s_addr,
	&txn, CORESIGHT_QMI_SET_ETM_REQ_V01,
	CORESIGHT_QMI_SET_ETM_REQ_MAX_LEN,
	coresight_set_etm_req_msg_v01_ei,
	&req);
	if (ret < 0) {
	dev_err(drvdata->dev, "QMI send ACK failed, ret:%d\n",
	ret);
	qmi_txn_cancel(&txn);
	goto err;
	}

	ret = qmi_txn_wait(&txn, msecs_to_jiffies(TIMEOUT_MS));
	if (ret < 0) {
	dev_err(drvdata->dev, "QMI qmi txn wait failed, ret:%d\n",
	ret);
	goto err;
	}

	/* Check the response */
	if (resp.resp.result != QMI_RESULT_SUCCESS_V01)
	dev_err(drvdata->dev, "QMI request failed 0x%x\n",
	resp.resp.error);

	drvdata->enable = true;
	mutex_unlock(&drvdata->mutex);

	dev_info(drvdata->dev, "Remote ETM tracing enabled for instance %d\n",
	drvdata->inst_id);
	return 0;
	err:
	mutex_unlock(&drvdata->mutex);
	return ret;
	}

	static void remote_etm_disable(struct coresight_device *csdev,
	struct perf_event *event)
	{
	struct remote_etm_drvdata *drvdata =
	dev_get_drvdata(csdev->dev.parent);
	struct coresight_set_etm_req_msg_v01 req;
	struct coresight_set_etm_resp_msg_v01 resp = { { 0, 0 } };
	struct qmi_txn txn;
	int ret;

	mutex_lock(&drvdata->mutex);
	if (!drvdata->service_connected) {
	dev_err(drvdata->dev, "QMI service not connected!\n");
	goto err;
	}

	req.state = CORESIGHT_ETM_STATE_DISABLED_V01;

	ret = qmi_txn_init(&drvdata->handle, &txn,
	coresight_set_etm_resp_msg_v01_ei,
	&resp);

	if (ret < 0) {
	dev_err(drvdata->dev, "QMI tx init failed , ret:%d\n",
	ret);
	goto err;
	}

	ret = qmi_send_request(&drvdata->handle, &drvdata->s_addr,
	&txn, CORESIGHT_QMI_SET_ETM_REQ_V01,
	CORESIGHT_QMI_SET_ETM_REQ_MAX_LEN,
	coresight_set_etm_req_msg_v01_ei,
	&req);
	if (ret < 0) {
	dev_err(drvdata->dev, "QMI send req failed, ret:%d\n",
	ret);
	qmi_txn_cancel(&txn);
	goto err;
	}

	ret = qmi_txn_wait(&txn, msecs_to_jiffies(TIMEOUT_MS));
	if (ret < 0) {
	dev_err(drvdata->dev, "QMI qmi txn wait failed, ret:%d\n",
	ret);
	goto err;
	}

	/* Check the response */
	if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
	dev_err(drvdata->dev, "QMI request failed 0x%x\n",
	resp.resp.error);
	goto err;
	}

	drvdata->enable = false;
	dev_info(drvdata->dev, "Remote ETM tracing disabled for instance %d\n",
	drvdata->inst_id);
	err:
	mutex_unlock(&drvdata->mutex);
	}

	static int remote_etm_trace_id(struct coresight_device *csdev)
	{
	struct remote_etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

	return drvdata->traceid;
	}

	static const struct coresight_ops_source remote_etm_source_ops = {
	.trace_id = remote_etm_trace_id,
	.enable = remote_etm_enable,
	.disable = remote_etm_disable,
	};

	static const struct coresight_ops remote_cs_ops = {
	.source_ops = &remote_etm_source_ops,
	};

	static int remote_etm_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct coresight_platform_data *pdata;
	struct remote_etm_drvdata *drvdata;
	struct coresight_desc desc = {0 };
	int ret;
	static int traceid = REMOTE_ETM_TRACE_ID_START;

	desc.name = coresight_alloc_device_name(&remote_etm_devs, dev);
	if (!desc.name)
	return -ENOMEM;
	pdata = coresight_get_platform_data(dev);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	pdev->dev.platform_data = pdata;

	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;

	drvdata->dev = &pdev->dev;
	platform_set_drvdata(pdev, drvdata);

	ret = of_property_read_u32(pdev->dev.of_node, "qcom,inst-id",
	&drvdata->inst_id);
	if (ret)
	return ret;

	mutex_init(&drvdata->mutex);

	ret = qmi_handle_init(&drvdata->handle,
	CORESIGHT_QMI_SET_ETM_REQ_MAX_LEN,
	&server_ops, NULL);
	if (ret < 0) {
	dev_err(dev, "Remote ETM client init failed ret:%d\n", ret);
	return ret;
	}

	qmi_add_lookup(&drvdata->handle,
	CORESIGHT_QMI_SVC_ID,
	CORESIGHT_QMI_VERSION,
	drvdata->inst_id);

	drvdata->traceid = traceid++;

	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
	desc.ops = &remote_cs_ops;
	desc.pdata = pdev->dev.platform_data;
	desc.dev = &pdev->dev;
	drvdata->csdev = coresight_register(&desc);
	if (IS_ERR(drvdata->csdev)) {
	ret = PTR_ERR(drvdata->csdev);
	goto err;
	}
	dev_info(dev, "Remote ETM initialized\n");

	if (drvdata->inst_id >= sizeof(int)*BITS_PER_BYTE)
	dev_err(dev, "inst_id greater than boot_enable bit mask\n");
	else if (boot_enable & BIT(drvdata->inst_id))
	coresight_enable(drvdata->csdev);

	return 0;
	err:
	qmi_handle_release(&drvdata->handle);
	return ret;
	}

	static int remote_etm_remove(struct platform_device *pdev)
	{
	struct remote_etm_drvdata *drvdata = platform_get_drvdata(pdev);

	qmi_handle_release(&drvdata->handle);
	coresight_unregister(drvdata->csdev);
	return 0;
	}

	static const struct of_device_id remote_etm_match[] = {
	{.compatible = "qcom,coresight-remote-etm"},
	{}
	};

	static struct platform_driver remote_etm_driver = {
	.probe = remote_etm_probe,
	.remove = remote_etm_remove,
	.driver = {
	.name = "coresight-remote-etm",
	.of_match_table = remote_etm_match,
	},
	};

	int __init remote_etm_init(void)
	{
	return platform_driver_register(&remote_etm_driver);
	}
	module_init(remote_etm_init);

	void __exit remote_etm_exit(void)
	{
	platform_driver_unregister(&remote_etm_driver);
	}
	module_exit(remote_etm_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("CoreSight Remote ETM driver");