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Commit 1d1adbb1 authored by Ram Chandrasekar's avatar Ram Chandrasekar
Browse files

drivers: lmh-dcvsh: Add debug support 



LMH DCVSh hardware can provide debug information. Provide a generic
debugfs interface in LMH DCVSh driver to support querying the
hardware for different information using a different command formats.

Change-Id: I10053a224e79f549ec68f9c39d652e7668b34ffc
Signed-off-by: default avatarRam Chandrasekar <rkumbako@codeaurora.org>
parent a3ba7da6

drivers/thermal/qcom/Makefile

+1 −1
Original line number Original line Diff line number Diff line 
obj-$(CONFIG_QCOM_TSENS)	+= qcom_tsens.o

obj-$(CONFIG_QCOM_TSENS)	+= qcom_tsens.o

qcom_tsens-y			+= tsens.o tsens-common.o tsens-8916.o tsens-8974.o tsens-8960.o tsens-8996.o

qcom_tsens-y			+= tsens.o tsens-common.o tsens-8916.o tsens-8974.o tsens-8960.o tsens-8996.o

obj-$(CONFIG_MSM_BCL_PERIPHERAL_CTL) += bcl_peripheral.o

obj-$(CONFIG_MSM_BCL_PERIPHERAL_CTL) += bcl_peripheral.o

obj-$(CONFIG_QTI_THERMAL_LIMITS_DCVS) += msm_lmh_dcvs.o

obj-$(CONFIG_QTI_THERMAL_LIMITS_DCVS) += msm_lmh_dcvs.o lmh_dbg.o

obj-$(CONFIG_QTI_VIRTUAL_SENSOR) += qti_virtual_sensor.o
 
obj-$(CONFIG_QTI_VIRTUAL_SENSOR) += qti_virtual_sensor.o

drivers/thermal/qcom/lmh_dbg.c

0 → 100644
+567 −0
Original line number Original line Diff line number Diff line 
/* Copyright (c) 2014-2017, 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.

 */



#define pr_fmt(fmt) "%s:%s " fmt, KBUILD_MODNAME, __func__



#include <linux/interrupt.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/slab.h>

#include <asm/cacheflush.h>

#include <soc/qcom/scm.h>

#include <linux/dma-mapping.h>

#include <linux/uaccess.h>

#include <linux/debugfs.h>



#include "lmh_dbg.h"



#define LMH_MON_NAME			"lmh_monitor"

#define LMH_DBGFS_READ			"data"

#define LMH_DBGFS_CONFIG_READ		"config"

#define LMH_DBGFS_READ_TYPES		"data_types"

#define LMH_DBGFS_CONFIG_TYPES		"config_types"

#define LMH_SCM_PAYLOAD_SIZE		10

#define LMH_READ_LINE_LENGTH            10

#define LMH_DEBUG_READ_TYPE		0x0

#define LMH_DEBUG_CONFIG_TYPE		0x1

#define LMH_DEBUG_SET			0x08

#define LMH_DEBUG_READ_BUF_SIZE		0x09

#define LMH_DEBUG_READ			0x0A

#define LMH_DEBUG_GET_TYPE		0x0B



struct lmh_driver_data {

	struct device			*dev;

	uint32_t			*read_type;

	uint32_t			*config_type;

	uint32_t			read_type_count;

	uint32_t			config_type_count;

	struct dentry			*debugfs_parent;

	struct dentry			*debug_read;

	struct dentry			*debug_config;

	struct dentry			*debug_read_type;

	struct dentry			*debug_config_type;

};



enum lmh_read_type {

	LMH_READ_TYPE = 0,

	LMH_CONFIG_TYPE,

};



static struct lmh_driver_data		*lmh_data;



static int lmh_debug_read(uint32_t **buf)

{

	int ret = 0, size = 0, tz_ret = 0;

	static uint32_t curr_size;

	struct scm_desc desc_arg;

	static uint32_t *payload;



	desc_arg.arginfo = SCM_ARGS(0);

	ret = scm_call2(SCM_SIP_FNID(SCM_SVC_LMH,

			LMH_DEBUG_READ_BUF_SIZE), &desc_arg);

	size = desc_arg.ret[0];

	if (ret) {

		pr_err("Error in SCM v%d get debug buffer size call. err:%d\n",

				(is_scm_armv8()) ? 8 : 7, ret);

		goto get_dbg_exit;

	}

	if (!size) {

		pr_err("No Debug data to read.\n");

		ret = -ENODEV;

		goto get_dbg_exit;

	}

	size = SCM_BUFFER_SIZE(uint32_t) * size * LMH_READ_LINE_LENGTH;

	if (curr_size != size) {

		if (payload)

			devm_kfree(lmh_data->dev, payload);

		payload = devm_kzalloc(lmh_data->dev, PAGE_ALIGN(size),

				       GFP_KERNEL);

		if (!payload) {

			ret = -ENOMEM;

			goto get_dbg_exit;

		}

		curr_size = size;

	}



	/* &payload may be a physical address > 4 GB */

	desc_arg.args[0] = SCM_BUFFER_PHYS(payload);

	desc_arg.args[1] = curr_size;

	desc_arg.arginfo = SCM_ARGS(2, SCM_RW, SCM_VAL);

	dmac_flush_range(payload, (void *)payload + curr_size);

	ret = scm_call2(SCM_SIP_FNID(SCM_SVC_LMH, LMH_DEBUG_READ),

			&desc_arg);

	dmac_inv_range(payload, (void *)payload + curr_size);

	tz_ret = desc_arg.ret[0];

	/* Have memory barrier before we access the TZ data */

	mb();

	if (ret) {

		pr_err("Error in get debug read. err:%d\n", ret);

		goto get_dbg_exit;

	}

	if (tz_ret) {

		pr_err("TZ API returned error. err:%d\n", tz_ret);

		ret = tz_ret;

		goto get_dbg_exit;

	}



get_dbg_exit:

	if (ret && payload) {

		devm_kfree(lmh_data->dev, payload);

		payload = NULL;

		curr_size = 0;

	}

	*buf = payload;



	return (ret < 0) ? ret : curr_size;

}



static int lmh_debug_config_write(uint32_t cmd_id, uint32_t *buf, int size)

{

	int ret = 0, size_bytes = 0;

	struct scm_desc desc_arg;

	uint32_t *payload = NULL;



	size_bytes = (size - 3) * sizeof(uint32_t);

	payload = devm_kzalloc(lmh_data->dev, PAGE_ALIGN(size_bytes),

			       GFP_KERNEL);

	if (!payload) {

		ret = -ENOMEM;

		goto set_cfg_exit;

	}

	memcpy(payload, &buf[3], size_bytes);



	/* &payload may be a physical address > 4 GB */

	desc_arg.args[0] = SCM_BUFFER_PHYS(payload);

	desc_arg.args[1] = size_bytes;

	desc_arg.args[2] = buf[0];

	desc_arg.args[3] = buf[1];

	desc_arg.args[4] = buf[2];

	desc_arg.arginfo = SCM_ARGS(5, SCM_RO, SCM_VAL, SCM_VAL, SCM_VAL,

					SCM_VAL);

	dmac_flush_range(payload, (void *)payload + size_bytes);

	ret = scm_call2(SCM_SIP_FNID(SCM_SVC_LMH, cmd_id), &desc_arg);

	/* Have memory barrier before we access the TZ data */

	mb();

	if (ret) {

		pr_err("Error in config debug read. err:%d\n", ret);

		goto set_cfg_exit;

	}



set_cfg_exit:

	return ret;

}



static int lmh_parse_and_extract(const char __user *user_buf, size_t count,

				enum lmh_read_type type)

{

	char *local_buf = NULL, *token = NULL, *curr_ptr = NULL, *token1 = NULL;

	char *next_line = NULL;

	int ret = 0, data_ct = 0, i = 0, size = 0;

	uint32_t *config_buf = NULL;



	/* Allocate two extra space to add ';' character and NULL terminate */

	local_buf = kzalloc(count + 2, GFP_KERNEL);

	if (!local_buf) {

		ret = -ENOMEM;

		goto dfs_cfg_write_exit;

	}

	if (copy_from_user(local_buf, user_buf, count)) {

		pr_err("user buf error\n");

		ret = -EFAULT;

		goto dfs_cfg_write_exit;

	}

	size = count + (strnchr(local_buf, count, '\n') ? 1 :  2);

	local_buf[size - 2] = ';';

	local_buf[size - 1] = '\0';

	curr_ptr = next_line = local_buf;

	while ((token1 = strnchr(next_line, local_buf + size - next_line, ';'))

		!= NULL) {

		data_ct = 0;

		*token1 = '\0';

		curr_ptr = next_line;

		next_line = token1 + 1;

		for (token = (char *)curr_ptr; token &&

			((token = strnchr(token, next_line - token, ' '))

			 != NULL); token++)

			data_ct++;

		if (data_ct < 2) {

			pr_err("Invalid format string:[%s]\n", curr_ptr);

			ret = -EINVAL;

			goto dfs_cfg_write_exit;

		}

		config_buf = kzalloc((++data_ct) * sizeof(uint32_t),

				GFP_KERNEL);

		if (!config_buf) {

			ret = -ENOMEM;

			goto dfs_cfg_write_exit;

		}

		pr_debug("Input:%s data_ct:%d\n", curr_ptr, data_ct);

		for (i = 0, token = (char *)curr_ptr; token && (i < data_ct);

			i++) {

			token = strnchr(token, next_line - token, ' ');

			if (token)

				*token = '\0';

			ret = kstrtouint(curr_ptr, 0, &config_buf[i]);

			if (ret < 0) {

				pr_err("Data[%s] scan error. err:%d\n",

					curr_ptr, ret);

				kfree(config_buf);

				goto dfs_cfg_write_exit;

			}

			if (token)

				curr_ptr = ++token;

		}

		switch (type) {

		case LMH_READ_TYPE:

		case LMH_CONFIG_TYPE:

			ret = lmh_debug_config_write(LMH_DEBUG_SET,

					config_buf, data_ct);

			break;

		default:

			ret = -EINVAL;

			break;

		}

		kfree(config_buf);

		if (ret) {

			pr_err("Config error. type:%d err:%d\n", type, ret);

			goto dfs_cfg_write_exit;

		}

	}



dfs_cfg_write_exit:

	kfree(local_buf);

	return ret;

}



static ssize_t lmh_dbgfs_config_write(struct file *file,

	const char __user *user_buf, size_t count, loff_t *ppos)

{

	lmh_parse_and_extract(user_buf, count, LMH_CONFIG_TYPE);

	return count;

}



static int lmh_dbgfs_data_read(struct seq_file *seq_fp, void *data)

{

	static uint32_t *read_buf;

	static int read_buf_size;

	int idx = 0, ret = 0;



	if (!read_buf_size) {

		ret = lmh_debug_read(&read_buf);

		if (ret <= 0)

			goto dfs_read_exit;

		if (!read_buf || ret < sizeof(uint32_t)) {

			ret = -EINVAL;

			goto dfs_read_exit;

		}

		read_buf_size = ret;

		ret = 0;

	}



	do {

		seq_printf(seq_fp, "0x%x ", read_buf[idx]);

		if (seq_has_overflowed(seq_fp)) {

			pr_err("Seq overflow. idx:%d\n", idx);

			goto dfs_read_exit;

		}

		idx++;

		if ((idx % LMH_READ_LINE_LENGTH) == 0) {

			seq_puts(seq_fp, "\n");

			if (seq_has_overflowed(seq_fp)) {

				pr_err("Seq overflow. idx:%d\n", idx);

				goto dfs_read_exit;

			}

		}

	} while (idx < (read_buf_size / sizeof(uint32_t)));

	read_buf_size = 0;

	read_buf = NULL;



dfs_read_exit:

	return ret;

}



static int lmh_get_recurssive_data(struct scm_desc *desc_arg, uint32_t cmd_idx,

		uint32_t *payload, uint32_t *size, uint32_t *dest_buf)

{

	int idx = 0, ret = 0;

	uint32_t next = 0;



	do {

		desc_arg->args[cmd_idx] = next;

		dmac_flush_range(payload, (void *)payload +

				sizeof(*payload) * LMH_SCM_PAYLOAD_SIZE);

		ret = scm_call2(SCM_SIP_FNID(SCM_SVC_LMH, LMH_DEBUG_GET_TYPE),

				desc_arg);

		dmac_inv_range(payload, (void *)payload +

				sizeof(*payload) * LMH_SCM_PAYLOAD_SIZE);

		*size = desc_arg->ret[0];

		/* Have barrier before reading from TZ data */

		mb();

		if (ret) {

			pr_err("Error in SCM get type. cmd:%x err:%d\n",

				LMH_DEBUG_GET_TYPE, ret);

			return ret;

		}

		if (!*size) {

			pr_err("No LMH device supported.\n");

			return -ENODEV;

		}

		if (!dest_buf)

			dest_buf = devm_kcalloc(lmh_data->dev, *size,

				sizeof(*dest_buf), GFP_KERNEL);

			if (!dest_buf)

				return -ENOMEM;



		for (idx = next;

			idx < min((next + LMH_SCM_PAYLOAD_SIZE), *size);

			idx++)

			dest_buf[idx] = payload[idx - next];

		next += LMH_SCM_PAYLOAD_SIZE;

	} while (next < *size);



	return ret;

}



static ssize_t lmh_dbgfs_data_write(struct file *file,

	const char __user *user_buf, size_t count, loff_t *ppos)

{

	lmh_parse_and_extract(user_buf, count, LMH_READ_TYPE);

	return count;

}



static int lmh_dbgfs_data_open(struct inode *inode, struct file *file)

{

	return single_open(file, lmh_dbgfs_data_read, inode->i_private);

}



static int lmh_debug_get_types(bool is_read, uint32_t **buf)

{

	int ret = 0;

	uint32_t size = 0;

	struct scm_desc desc_arg;

	uint32_t *payload = NULL, *dest_buf = NULL;



	if (is_read && lmh_data->read_type) {

		*buf = lmh_data->read_type;

		return lmh_data->read_type_count;

	} else if (!is_read && lmh_data->config_type) {

		*buf = lmh_data->config_type;

		return lmh_data->config_type_count;

	}

	payload = devm_kzalloc(lmh_data->dev,

				PAGE_ALIGN(LMH_SCM_PAYLOAD_SIZE *

				sizeof(*payload)), GFP_KERNEL);

	if (!payload)

		return -ENOMEM;

	/* &payload may be a physical address > 4 GB */

	desc_arg.args[0] = SCM_BUFFER_PHYS(payload);

	desc_arg.args[1] =

		SCM_BUFFER_SIZE(uint32_t) * LMH_SCM_PAYLOAD_SIZE;

	desc_arg.args[2] = (is_read) ?

			LMH_DEBUG_READ_TYPE : LMH_DEBUG_CONFIG_TYPE;

	desc_arg.arginfo = SCM_ARGS(4, SCM_RW, SCM_VAL, SCM_VAL, SCM_VAL);

	ret = lmh_get_recurssive_data(&desc_arg, 3, payload, &size, dest_buf);

	if (ret)

		goto get_type_exit;

	pr_debug("Total %s types:%d\n", (is_read) ? "read" : "config", size);

	if (is_read) {

		lmh_data->read_type = *buf = dest_buf;

		lmh_data->read_type_count = size;

	} else {

		lmh_data->config_type = *buf = dest_buf;

		lmh_data->config_type_count = size;

	}



get_type_exit:

	if (ret) {

		if (lmh_data->read_type_count) {

			devm_kfree(lmh_data->dev, lmh_data->read_type);

			lmh_data->read_type_count = 0;

		}

		if (lmh_data->config_type_count) {

			devm_kfree(lmh_data->dev, lmh_data->config_type);

			lmh_data->config_type_count = 0;

		}

	}

	if (payload)

		devm_kfree(lmh_data->dev, payload);



	return (ret) ? ret : size;

}



static int lmh_get_types(struct seq_file *seq_fp, enum lmh_read_type type)

{

	int ret = 0, idx = 0, size = 0;

	uint32_t *type_list = NULL;



	switch (type) {

	case LMH_READ_TYPE:

		ret = lmh_debug_get_types(true, &type_list);

		break;

	case LMH_CONFIG_TYPE:

		ret = lmh_debug_get_types(false, &type_list);

		break;

	default:

		return -EINVAL;

	}

	if (ret <= 0 || !type_list) {

		pr_err("No device information. err:%d\n", ret);

		return -ENODEV;

	}

	size = ret;

	for (idx = 0; idx < size; idx++)

		seq_printf(seq_fp, "0x%x ", type_list[idx]);

	seq_puts(seq_fp, "\n");



	return 0;

}



static int lmh_dbgfs_read_type(struct seq_file *seq_fp, void *data)

{

	return lmh_get_types(seq_fp, LMH_READ_TYPE);

}



static int lmh_dbgfs_read_type_open(struct inode *inode, struct file *file)

{

	return single_open(file, lmh_dbgfs_read_type, inode->i_private);

}



static int lmh_dbgfs_config_type(struct seq_file *seq_fp, void *data)

{

	return lmh_get_types(seq_fp, LMH_CONFIG_TYPE);

}



static int lmh_dbgfs_config_type_open(struct inode *inode, struct file *file)

{

	return single_open(file, lmh_dbgfs_config_type, inode->i_private);

}



static const struct file_operations lmh_dbgfs_config_fops = {

	.write = lmh_dbgfs_config_write,

};

static const struct file_operations lmh_dbgfs_read_fops = {

	.open = lmh_dbgfs_data_open,

	.read = seq_read,

	.write = lmh_dbgfs_data_write,

	.llseek = seq_lseek,

	.release = single_release,

};

static const struct file_operations lmh_dbgfs_read_type_fops = {

	.open = lmh_dbgfs_read_type_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};

static const struct file_operations lmh_dbgfs_config_type_fops = {

	.open = lmh_dbgfs_config_type_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



static int lmh_check_tz_debug_cmds(void)

{

	if (!scm_is_call_available(SCM_SVC_LMH, LMH_DEBUG_SET)

		|| !scm_is_call_available(SCM_SVC_LMH, LMH_DEBUG_READ_BUF_SIZE)

		|| !scm_is_call_available(SCM_SVC_LMH, LMH_DEBUG_READ)

		|| !scm_is_call_available(SCM_SVC_LMH, LMH_DEBUG_GET_TYPE)) {

		pr_debug("LMH debug scm not available\n");

		return -ENODEV;

	}



	return 0;

}



static int lmh_debug_init(void)

{

	int ret = 0;



	if (lmh_check_tz_debug_cmds()) {

		pr_debug("Debug commands not available.\n");

		return -ENODEV;

	}



	lmh_data->debugfs_parent = debugfs_create_dir(LMH_MON_NAME, NULL);

	if (IS_ERR(lmh_data->debugfs_parent)) {

		ret = PTR_ERR(lmh_data->debugfs_parent);

		pr_debug("Error creating debugfs dir:%s. err:%d\n",

					LMH_MON_NAME, ret);

		return ret;

	}

	lmh_data->debug_read = debugfs_create_file(LMH_DBGFS_READ, 0600,

					lmh_data->debugfs_parent, NULL,

					&lmh_dbgfs_read_fops);

	if (IS_ERR(lmh_data->debug_read)) {

		pr_err("Error creating" LMH_DBGFS_READ "entry.\n");

		ret = PTR_ERR(lmh_data->debug_read);

		goto dbg_reg_exit;

	}

	lmh_data->debug_config = debugfs_create_file(LMH_DBGFS_CONFIG_READ,

					0200, lmh_data->debugfs_parent, NULL,

					&lmh_dbgfs_config_fops);

	if (IS_ERR(lmh_data->debug_config)) {

		pr_err("Error creating" LMH_DBGFS_CONFIG_READ "entry\n");

		ret = PTR_ERR(lmh_data->debug_config);

		goto dbg_reg_exit;

	}

	lmh_data->debug_read_type = debugfs_create_file(LMH_DBGFS_READ_TYPES,

					0400, lmh_data->debugfs_parent, NULL,

					&lmh_dbgfs_read_type_fops);

	if (IS_ERR(lmh_data->debug_read_type)) {

		pr_err("Error creating" LMH_DBGFS_READ_TYPES "entry\n");

		ret = PTR_ERR(lmh_data->debug_read_type);

		goto dbg_reg_exit;

	}

	lmh_data->debug_read_type = debugfs_create_file(

					LMH_DBGFS_CONFIG_TYPES,

					0400, lmh_data->debugfs_parent, NULL,

					&lmh_dbgfs_config_type_fops);

	if (IS_ERR(lmh_data->debug_config_type)) {

		pr_err("Error creating" LMH_DBGFS_CONFIG_TYPES "entry\n");

		ret = PTR_ERR(lmh_data->debug_config_type);

		goto dbg_reg_exit;

	}



dbg_reg_exit:

	if (ret)

		/*Clean up all the dbg nodes*/

		debugfs_remove_recursive(lmh_data->debugfs_parent);



	return ret;

}



int lmh_debug_register(struct platform_device *pdev)

{

	int ret = 0;



	if (lmh_data) {

		pr_debug("Reinitializing lmh hardware driver\n");

		return -EEXIST;

	}

	lmh_data = devm_kzalloc(&pdev->dev, sizeof(*lmh_data), GFP_KERNEL);

	if (!lmh_data)

		return -ENOMEM;

	lmh_data->dev = &pdev->dev;



	ret = lmh_debug_init();

	if (ret) {

		pr_debug("LMH debug init failed. err:%d\n", ret);

		goto probe_exit;

	}



	return ret;



probe_exit:

	lmh_data = NULL;

	return ret;

}

EXPORT_SYMBOL(lmh_debug_register);

drivers/thermal/qcom/lmh_dbg.h

0 → 100644
+20 −0
Original line number Original line Diff line number Diff line 
/* Copyright (c) 2014-2017, 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.

 */



#ifndef __QTI_LMH_H__

#define __QTI_LMH_H__



#include <linux/platform_device.h>



int lmh_debug_register(struct platform_device *pdev);



#endif /* __QTI_LMH_H__ */

drivers/thermal/qcom/msm_lmh_dcvs.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <soc/qcom/scm.h>

#include <soc/qcom/scm.h>





#include "../thermal_core.h"

#include "../thermal_core.h"

#include "lmh_dbg.h"





#define CREATE_TRACE_POINTS

#define CREATE_TRACE_POINTS

#include <trace/events/lmh.h>

#include <trace/events/lmh.h>
@@ -590,6 +591,7 @@ static int limits_dcvs_probe(struct platform_device *pdev) 
	INIT_LIST_HEAD(&hw->list);

	INIT_LIST_HEAD(&hw->list);

	list_add(&hw->list, &lmh_dcvs_hw_list);

	list_add(&hw->list, &lmh_dcvs_hw_list);

	mutex_unlock(&lmh_dcvs_list_access);

	mutex_unlock(&lmh_dcvs_list_access);

	lmh_debug_register(pdev);





	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "lmh-dcvs/cdev:online",

	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "lmh-dcvs/cdev:online",

				limits_cpu_online, NULL);

				limits_cpu_online, NULL);