driver-add-hilog-and-hievent-buffer-management-drive.patch

From dab1259b6d11e2c3fc794cca2d55e7f984828a0f Mon Sep 17 00:00:00 2001
From: stesen <stesen.ma@huawei.com>
Date: Wed, 21 Jul 2021 15:14:30 +0800
Subject: [PATCH] driver: add hilog and hievent buffer management drivers
Content-Type: text/plain; charset = "utf-8"
Content-Transfert-Encoding: 8bit

ohos inclusion
category: feature
feature: dfx drivers
issue: #I3XQ1T

--------------------------------

Hilog driver is used by the hilog feature on small devices.
It manage the log buffer and provide an synced log read and
asynchronous write logic.

Hievent Driver is similar to the hilog driver, but used by
the hievent feature.

Signed-off-by: stesen <stesen.ma@huawei.com>
Signed-off-by: Zachery Wu <wuzuoyu@huawei.com>

Upstream-Status: Inappropriate [ OpenHarmony specific ]
---
 drivers/staging/Kconfig                  |   4 +
 drivers/staging/Makefile                 |   2 +
 drivers/staging/hievent/Kconfig          |   4 +
 drivers/staging/hievent/Makefile         |   3 +
 drivers/staging/hievent/hievent_driver.c | 422 +++++++++++++++++++
 drivers/staging/hievent/hievent_driver.h |  32 ++
 drivers/staging/hievent/hiview_hievent.c | 498 +++++++++++++++++++++++
 drivers/staging/hievent/hiview_hievent.h |  44 ++
 drivers/staging/hilog/Kconfig            |  21 +
 drivers/staging/hilog/Makefile           |   5 +
 drivers/staging/hilog/hilog.c            | 381 +++++++++++++++++
 11 files changed, 1416 insertions(+)
 create mode 100644 drivers/staging/hievent/Kconfig
 create mode 100644 drivers/staging/hievent/Makefile
 create mode 100644 drivers/staging/hievent/hievent_driver.c
 create mode 100644 drivers/staging/hievent/hievent_driver.h
 create mode 100644 drivers/staging/hievent/hiview_hievent.c
 create mode 100644 drivers/staging/hievent/hiview_hievent.h
 create mode 100644 drivers/staging/hilog/Kconfig
 create mode 100644 drivers/staging/hilog/Makefile
 create mode 100644 drivers/staging/hilog/hilog.c

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 2d0310448eba..4dbdc87e809c 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -118,4 +118,8 @@ source "drivers/staging/wfx/Kconfig"
 
 source "drivers/staging/hikey9xx/Kconfig"
 
+source "drivers/staging/hilog/Kconfig"
+
+source "drivers/staging/hievent/Kconfig"
+
 endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 757a892ab5b9..b33dfbdcce7e 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -49,3 +49,5 @@ obj-$(CONFIG_KPC2000)		+= kpc2000/
 obj-$(CONFIG_QLGE)		+= qlge/
 obj-$(CONFIG_WFX)		+= wfx/
 obj-y				+= hikey9xx/
+obj-$(CONFIG_HILOG) 		+= hilog/
+obj-$(CONFIG_HIEVENT) 		+= hievent/
diff --git a/drivers/staging/hievent/Kconfig b/drivers/staging/hievent/Kconfig
new file mode 100644
index 000000000000..39da4c041ba9
--- /dev/null
+++ b/drivers/staging/hievent/Kconfig
@@ -0,0 +1,4 @@
+config HIEVENT
+    tristate "Enable hievent"
+    help
+	hievent buffer manager
diff --git a/drivers/staging/hievent/Makefile b/drivers/staging/hievent/Makefile
new file mode 100644
index 000000000000..530802d59156
--- /dev/null
+++ b/drivers/staging/hievent/Makefile
@@ -0,0 +1,3 @@
+
+obj-$(CONFIG_HIEVENT)		+= hievent_driver.o
+obj-$(CONFIG_HIEVENT)		+= hiview_hievent.o
\ No newline at end of file
diff --git a/drivers/staging/hievent/hievent_driver.c b/drivers/staging/hievent/hievent_driver.c
new file mode 100644
index 000000000000..f6b378766abc
--- /dev/null
+++ b/drivers/staging/hievent/hievent_driver.c
@@ -0,0 +1,422 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Huawei Technologies Co., Ltd. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 "hievent_driver.h"
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/cdev.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/rtc.h>
+#include <linux/version.h>
+#include <linux/uio.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+
+#ifndef HIEVENTDEV_MAJOR
+#define HIEVENTDEV_MAJOR 241
+#endif
+
+#ifndef HIEVENT_NR_DEVS
+#define HIEVENT_NR_DEVS 2
+#endif
+
+static int hievent_major = HIEVENTDEV_MAJOR;
+
+static struct cdev hievent_cdev;
+
+#define HIEVENT_BUFFER ((size_t)1024)
+#define HIEVENT_DRIVER "/dev/hwlog_exception"
+
+struct hievent_entry {
+	unsigned short len;
+	unsigned short header_size;
+	int pid;
+	int tid;
+	int sec;
+	int nsec;
+	char msg[0];
+};
+
+struct hievent_char_device {
+	int flag;
+	struct mutex mtx; /* lock to protect read/write buffer */
+	unsigned char *buffer;
+	wait_queue_head_t wq;
+	size_t write_offset;
+	size_t head_offset;
+	size_t size;
+	size_t count;
+} hievent_dev;
+
+static inline unsigned char *hievent_buffer_head(void)
+{
+	if (hievent_dev.head_offset > HIEVENT_BUFFER)
+		hievent_dev.head_offset =
+			hievent_dev.head_offset % HIEVENT_BUFFER;
+
+	return hievent_dev.buffer + hievent_dev.head_offset;
+}
+
+static void hievent_buffer_inc(size_t sz)
+{
+	if (hievent_dev.size + sz <= HIEVENT_BUFFER) {
+		hievent_dev.size += sz;
+		hievent_dev.write_offset += sz;
+		hievent_dev.write_offset %= HIEVENT_BUFFER;
+		hievent_dev.count++;
+	}
+}
+
+static void hievent_buffer_dec(size_t sz)
+{
+	if (hievent_dev.size >= sz) {
+		hievent_dev.size -= sz;
+		hievent_dev.head_offset += sz;
+		hievent_dev.head_offset %= HIEVENT_BUFFER;
+		hievent_dev.count--;
+	}
+}
+
+static int hievent_read_ring_buffer(unsigned char __user *buffer,
+				    size_t buf_len)
+{
+	size_t retval;
+	size_t buf_left = HIEVENT_BUFFER - hievent_dev.head_offset;
+
+	if (buf_left > buf_len) {
+		retval = copy_to_user(buffer, hievent_buffer_head(), buf_len);
+	} else {
+		size_t mem_len = (buf_len > buf_left) ? buf_left : buf_len;
+
+		retval = copy_to_user(buffer, hievent_buffer_head(), mem_len);
+		if (retval < 0)
+			return retval;
+
+		retval = copy_to_user(buffer + buf_left, hievent_dev.buffer,
+				      buf_len - buf_left);
+	}
+	return retval;
+}
+
+static int hievent_read_ring_head_buffer(unsigned char * const buffer,
+					 size_t buf_len)
+{
+	size_t buf_left = HIEVENT_BUFFER - hievent_dev.head_offset;
+
+	if (buf_left > buf_len) {
+		memcpy(buffer, hievent_buffer_head(), buf_len);
+	} else {
+		size_t mem_len = (buf_len > buf_left) ? buf_left : buf_len;
+
+		memcpy(buffer, hievent_buffer_head(), mem_len);
+		memcpy(buffer + buf_left, hievent_dev.buffer,
+		       buf_len - buf_left);
+	}
+	return 0;
+}
+
+static ssize_t hievent_read(struct file *file, char __user *user_buf,
+			    size_t count, loff_t *ppos)
+{
+	size_t retval;
+	struct hievent_entry header;
+
+	(void)file;
+
+	wait_event_interruptible(hievent_dev.wq, (hievent_dev.size > 0));
+
+	(void)mutex_lock(&hievent_dev.mtx);
+
+	retval = hievent_read_ring_head_buffer((unsigned char *)&header,
+					       sizeof(header));
+	if (retval < 0) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	if (count < header.len + sizeof(header)) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	hievent_buffer_dec(sizeof(header));
+	retval = copy_to_user((unsigned char *)user_buf,
+			      (unsigned char *)&header,
+			      min(count, sizeof(header)));
+	if (retval < 0) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	retval = hievent_read_ring_buffer((unsigned char *)(user_buf +
+					  sizeof(header)), header.len);
+	if (retval < 0) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	hievent_buffer_dec(header.len);
+
+	retval = header.len + sizeof(header);
+out:
+	(void)mutex_unlock(&hievent_dev.mtx);
+
+	return retval;
+}
+
+static int hievent_write_ring_head_buffer(const unsigned char *buffer,
+					  size_t buf_len)
+{
+	size_t buf_left = HIEVENT_BUFFER - hievent_dev.write_offset;
+
+	if (buf_len > buf_left) {
+		memcpy(hievent_dev.buffer + hievent_dev.write_offset,
+		       buffer, buf_left);
+		memcpy(hievent_dev.buffer, buffer + buf_left,
+		       min(HIEVENT_BUFFER, buf_len - buf_left));
+	} else {
+		memcpy(hievent_dev.buffer + hievent_dev.write_offset,
+		       buffer, min(buf_left, buf_len));
+	}
+
+	return 0;
+}
+
+static void hievent_head_init(struct hievent_entry * const header, size_t len)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)
+#define NANOSEC_PER_MIRCOSEC 1000
+	struct timeval now = { 0 };
+
+	do_gettimeofday(&now);
+
+	header->sec = now.tv_sec;
+	header->nsec = now.tv_usec * NANOSEC_PER_MIRCOSEC;
+#else
+	struct timespec64 now = { 0 };
+
+	ktime_get_real_ts64(&now);
+
+	header->sec = now.tv_sec;
+	header->nsec = now.tv_nsec;
+#endif
+
+	header->len = (unsigned short)len;
+	header->pid = current->pid;
+	header->tid = 0;
+	header->header_size = sizeof(struct hievent_entry);
+}
+
+static void hievent_cover_old_log(size_t buf_len)
+{
+	int retval;
+	struct hievent_entry header;
+	size_t total_size = buf_len + sizeof(struct hievent_entry);
+
+	while (total_size + hievent_dev.size >= HIEVENT_BUFFER) {
+		retval = hievent_read_ring_head_buffer((unsigned char *)&header,
+						       sizeof(header));
+		if (retval < 0)
+			break;
+
+		/* let count decrease twice */
+		hievent_buffer_dec(sizeof(header));
+		hievent_buffer_dec(header.len);
+	}
+}
+
+int hievent_write_internal(const char *buffer, size_t buf_len)
+{
+	struct hievent_entry header;
+	int retval;
+
+	if (buf_len < sizeof(int) ||
+	    buf_len > HIEVENT_BUFFER - sizeof(struct hievent_entry))
+		return -EINVAL;
+
+	(void)mutex_lock(&hievent_dev.mtx);
+
+	hievent_cover_old_log(buf_len);
+
+	hievent_head_init(&header, buf_len);
+
+	retval = hievent_write_ring_head_buffer((unsigned char *)&header,
+						sizeof(header));
+	if (retval) {
+		retval = -EINVAL;
+		goto out;
+	}
+	hievent_buffer_inc(sizeof(header));
+
+	retval = hievent_write_ring_head_buffer((unsigned char *)(buffer),
+						header.len);
+	if (retval) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	hievent_buffer_inc(header.len);
+
+	retval = header.len;
+
+out:
+	(void)mutex_unlock(&hievent_dev.mtx);
+	if (retval > 0)
+		wake_up_interruptible(&hievent_dev.wq);
+
+	return retval;
+}
+
+static unsigned int hievent_poll(struct file *filep,
+				 struct poll_table_struct *fds)
+{
+	(void)filep;
+	(void)fds;
+
+	wait_event_interruptible(hievent_dev.wq, (hievent_dev.size > 0));
+
+	return (POLLOUT | POLLWRNORM);
+}
+
+static ssize_t  hievent_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+	int check_code = 0;
+	unsigned char *temp_buffer = NULL;
+	const struct iovec *iov = from->iov;
+	int retval;
+	int buf_len;
+
+	(void)iocb;
+	if (from->nr_segs != 3) {     /* must contain 3 segments */
+		retval = -EINVAL;
+		goto out;
+	}
+
+	retval = copy_from_user(&check_code, iov[0].iov_base,
+				sizeof(check_code));
+	if (retval || check_code != CHECK_CODE) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	/* seg 1 && 2 is head info */
+	buf_len = iov[1].iov_len + iov[2].iov_len;
+	if (buf_len > HIEVENT_BUFFER - sizeof(struct hievent_entry)) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	temp_buffer = kmalloc(buf_len, GFP_KERNEL);
+	if (!temp_buffer) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	retval = copy_from_user(temp_buffer, iov[1].iov_base, iov[1].iov_len);
+	if (retval) {
+		retval = -EIO;
+		goto free_mem;
+	}
+
+	/* 1 2 head info */
+	retval = copy_from_user(temp_buffer + iov[1].iov_len, iov[2].iov_base,
+				iov[2].iov_len);
+	if (retval) {
+		retval = -EIO;
+		goto free_mem;
+	}
+
+	retval = hievent_write_internal(temp_buffer, buf_len);
+	if (retval) {
+		retval = -EIO;
+		goto free_mem;
+	}
+
+	retval = buf_len + iov[0].iov_len;
+
+free_mem:
+	kfree(temp_buffer);
+
+out:
+	return retval;
+}
+
+static const struct file_operations hievent_fops = {
+	.read  = hievent_read,   /* read */
+	.poll  = hievent_poll,   /* poll */
+	.write_iter = hievent_write_iter, /* write_iter */
+};
+
+static void hievent_device_init(void)
+{
+	hievent_dev.buffer = kmalloc(HIEVENT_BUFFER, GFP_KERNEL);
+	if (!hievent_dev.buffer)
+		return;
+
+	init_waitqueue_head(&hievent_dev.wq);
+	mutex_init(&hievent_dev.mtx);
+	hievent_dev.write_offset = 0;
+	hievent_dev.head_offset = 0;
+	hievent_dev.size = 0;
+	hievent_dev.count = 0;
+}
+
+static int __init hieventdev_init(void)
+{
+	int result;
+	dev_t devno = MKDEV(hievent_major, 0);
+
+	result = register_chrdev_region(devno, 2, "hwlog_exception");
+	if (result < 0)
+		return result;
+
+	cdev_init(&hievent_cdev, &hievent_fops);
+	hievent_cdev.owner = THIS_MODULE;
+	hievent_cdev.ops = &hievent_fops;
+
+	cdev_add(&hievent_cdev, MKDEV(hievent_major, 0), HIEVENT_NR_DEVS);
+
+	hievent_device_init();
+	return 0;
+}
+
+static void __exit hievent_exit_module(void)
+{
+	cdev_del(&hievent_cdev);
+	unregister_chrdev_region(MKDEV(hievent_major, 0), HIEVENT_NR_DEVS);
+}
+
+static int __init hievent_init_module(void)
+{
+	int state;
+
+	state = hieventdev_init();
+	return 0;
+}
+
+module_init(hievent_init_module);
+module_exit(hievent_exit_module);
+
+MODULE_AUTHOR("OHOS");
+MODULE_DESCRIPTION("User mode hievent device interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("hievent");
diff --git a/drivers/staging/hievent/hievent_driver.h b/drivers/staging/hievent/hievent_driver.h
new file mode 100644
index 000000000000..56eb0c5ea316
--- /dev/null
+++ b/drivers/staging/hievent/hievent_driver.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2021 Huawei Technologies Co., Ltd. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 HIEVENT_DRIVER_H
+#define HIEVENT_DRIVER_H
+
+#include <linux/types.h>
+
+#define CHECK_CODE 0x7BCDABCD
+
+struct idap_header {
+	char level;
+	char category;
+	char log_type;
+	char sn;
+};
+
+int hievent_write_internal(const char *buffer, size_t buf_len);
+
+#endif /* HIEVENT_DRIVER_H */
diff --git a/drivers/staging/hievent/hiview_hievent.c b/drivers/staging/hievent/hiview_hievent.c
new file mode 100644
index 000000000000..552965dfacb4
--- /dev/null
+++ b/drivers/staging/hievent/hiview_hievent.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Huawei Technologies Co., Ltd. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 "hiview_hievent.h"
+#include "hievent_driver.h"
+
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#define INT_TYPE_MAX_LEN    21
+
+#define MAX_PATH_LEN        256
+#define MAX_STR_LEN         (10 * 1024)
+
+/* 64K is max length of /dev/hwlog_exception */
+#define EVENT_INFO_BUF_LEN         (64 * 1024)
+#define EVENT_INFO_PACK_BUF_LEN    (2 * 1024)
+
+#define BUF_POINTER_FORWARD                     \
+do {                                    \
+	if (tmplen < len) {                 \
+		tmp += tmplen;                  \
+		len -= tmplen;                  \
+	} else {                            \
+		tmp += len;                     \
+		len = 0;                        \
+	}                                   \
+} while (0)
+
+struct hievent_payload {
+	char *key;
+	char *value;
+	struct hievent_payload *next;
+};
+
+static int hievent_convert_string(struct hiview_hievent *event, char **pbuf);
+
+static struct hievent_payload *hievent_payload_create(void);
+
+static void hievent_payload_destroy(struct hievent_payload *p);
+
+static struct hievent_payload *hievent_get_payload(struct hievent_payload *head,
+						   const char *key);
+
+static void hievent_add_payload(struct hiview_hievent *obj,
+				struct hievent_payload *payload);
+
+static struct hievent_payload *hievent_payload_create(void)
+{
+	struct hievent_payload *payload = NULL;
+
+	payload = kmalloc(sizeof(*payload), GFP_KERNEL);
+	if (!payload)
+		return NULL;
+
+	payload->key = NULL;
+	payload->value = NULL;
+	payload->next = NULL;
+
+	return payload;
+}
+
+static void hievent_payload_destroy(struct hievent_payload *p)
+{
+	if (!p)
+		return;
+
+	kfree(p->value);
+	kfree(p->key);
+	kfree(p);
+}
+
+static struct hievent_payload *hievent_get_payload(struct hievent_payload *head,
+						   const char *key)
+{
+	struct hievent_payload *p = head;
+
+	while (p) {
+		if (key && p->key) {
+			if (strcmp(p->key, key) == 0)
+				return p;
+		}
+		p = p->next;
+	}
+
+	return NULL;
+}
+
+static void hievent_add_payload(struct hiview_hievent *obj,
+				struct hievent_payload *payload)
+{
+	if (!obj->head) {
+		obj->head = payload;
+	} else {
+		struct hievent_payload *p = obj->head;
+
+		while (p->next)
+			p = p->next;
+		p->next = payload;
+	}
+}
+
+struct hiview_hievent *hievent_create(unsigned int eventid)
+{
+	struct hiview_hievent *event = NULL;
+
+	/* combined event obj struct */
+	event = kmalloc(sizeof(*event), GFP_KERNEL);
+	if (!event)
+		return NULL;
+
+	memset(event, 0, sizeof(*event));
+	event->eventid = eventid;
+	pr_debug("%s : %u\n", __func__, eventid);
+
+	return (void *)event;
+}
+
+int hievent_put_integer(struct hiview_hievent *event,
+			const char *key, long value)
+{
+	int ret;
+	struct hievent_payload *payload = NULL;
+
+	if ((!event) || (!key)) {
+		pr_err("Bad input event or key for %s", __func__);
+		return -EINVAL;
+	}
+
+	payload = hievent_get_payload(event->head, key);
+	if (!payload) {
+		payload = hievent_payload_create();
+		if (!payload)
+			return -ENOMEM;
+		payload->key = kstrdup(key, GFP_KERNEL);
+		hievent_add_payload(event, payload);
+	}
+
+	kfree(payload->value);
+
+	payload->value = kmalloc(INT_TYPE_MAX_LEN, GFP_KERNEL);
+	if (!payload->value)
+		return -ENOMEM;
+
+	(void)memset(payload->value, 0, INT_TYPE_MAX_LEN);
+	ret = snprintf(payload->value, INT_TYPE_MAX_LEN, "%d", (int)value);
+	if (ret < 0)
+		return -ENOMEM;
+
+	return 0;
+}
+
+int hievent_put_string(struct hiview_hievent *event,
+		       const char *key, const char *value)
+{
+	struct hievent_payload *payload = NULL;
+	int len;
+
+	if ((!event) || (!key) || (!value)) {
+		pr_err("Bad key for %s", __func__);
+		return -EINVAL;
+	}
+
+	payload = hievent_get_payload(event->head, key);
+	if (!payload) {
+		payload = hievent_payload_create();
+		if (!payload)
+			return -ENOMEM;
+
+		payload->key = kstrdup(key, GFP_KERNEL);
+		hievent_add_payload(event, payload);
+	}
+
+	kfree(payload->value);
+
+	len = strlen(value);
+	/* prevent length larger than MAX_STR_LEN */
+	if (len > MAX_STR_LEN)
+		len = MAX_STR_LEN;
+
+	payload->value = kmalloc(len + 1, GFP_KERNEL);
+	if (!payload->value)
+		return -ENOMEM;
+
+	(void)memset(payload->value, 0, len + 1);
+	if (strncpy(payload->value, value, len) > 0)
+		payload->value[len] = '\0';
+
+	return 0;
+}
+
+int hievent_set_time(struct hiview_hievent *event, long long seconds)
+{
+	if ((!event) || (seconds == 0)) {
+		pr_err("Bad input for %s", __func__);
+		return -EINVAL;
+	}
+	event->time = seconds;
+	return 0;
+}
+
+static int append_array_item(char **pool, int pool_len, const char *path)
+{
+	int i;
+
+	if ((!path) || (path[0] == 0)) {
+		pr_err("Bad path %s", __func__);
+		return -EINVAL;
+	}
+
+	if (strlen(path) > MAX_PATH_LEN) {
+		pr_err("file path over max: %d", MAX_PATH_LEN);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < pool_len; i++) {
+		if (pool[i] != 0)
+			continue;
+
+		pool[i] = kstrdup(path, GFP_KERNEL);
+		if (!pool[i])
+			return -ENOMEM;
+
+		break;
+	}
+
+	if (i == MAX_PATH_NUMBER) {
+		pr_err("Too many paths");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int hievent_add_filepath(struct hiview_hievent *event, const char *path)
+{
+	if (!event) {
+		pr_err("Bad path %s", __func__);
+		return -EINVAL;
+	}
+	return append_array_item(event->file_path, MAX_PATH_NUMBER, path);
+}
+
+/* make string ":" to "::", ";" to ";;", and remove newline character
+ * for example: "abc:def;ghi" transfer to "abc::def;;ghi"
+ */
+static char *hievent_make_regular(char *value)
+{
+	int count = 0;
+	int len = 0;
+	char *temp = value;
+	char *regular = NULL;
+	char *regular_tmp = NULL;
+	size_t regular_len;
+
+	while (*temp != '\0') {
+		if (*temp == ':')
+			count++;
+		else if (*temp == ';')
+			count++;
+		else if ((*temp == '\n') || (*temp == '\r'))
+			*temp = ' ';
+
+		temp++;
+		len++;
+	}
+
+	/* no need to transfer, just return old value */
+	if (count == 0)
+		return value;
+
+	regular_len = len + count * 2 + 1; // 2 char in a byte
+	regular = kmalloc(regular_len, GFP_KERNEL);
+	if (!regular)
+		return NULL;
+
+	(void)memset(regular, 0, regular_len);
+	regular_tmp = regular;
+	temp = value;
+	while (*temp != 0) {
+		if ((*temp == ':') || (*temp == ';'))
+			*regular_tmp++ = *temp;
+
+		*regular_tmp++ = *temp;
+		temp++;
+	}
+	*regular_tmp = '\0';
+
+	return regular;
+}
+
+int logbuff_to_exception(char category, int level, char log_type,
+			 char sn, const char *msg, int msglen)
+{
+	struct idap_header *hdr = NULL;
+	size_t buf_len = sizeof(int) + sizeof(struct idap_header) + msglen;
+	int ret;
+	int *check_code = NULL;
+	char *buffer = kmalloc(buf_len, GFP_KERNEL);
+
+	if (!buffer)
+		return -ENOMEM;
+
+	check_code = (int *)buffer;
+	*check_code = CHECK_CODE;
+
+	hdr = (struct idap_header *)(buffer + sizeof(int));
+	hdr->level = level;
+	hdr->category = category;
+	hdr->log_type = log_type;
+	hdr->sn = sn;
+
+	memcpy(buffer + sizeof(int) + sizeof(struct idap_header), msg, msglen);
+
+	ret = hievent_write_internal(buffer, buf_len);
+
+	kfree(buffer);
+
+	return ret;
+}
+
+static int hievent_fill_payload(struct hiview_hievent *event, char **pbuf,
+				char *tmp, int length)
+{
+	struct hievent_payload *p = event->head;
+	int len = length;
+	int tmplen;
+	unsigned int keycount = 0;
+
+	while (p) {
+		char *value = NULL;
+		char *regular_value = NULL;
+		int need_free = 1;
+
+		if (!p->value) {
+			p = p->next;
+			continue;
+		}
+		if (keycount == 0) {
+			tmplen = snprintf(tmp, len - 1, " --extra ");
+			BUF_POINTER_FORWARD;
+		}
+		keycount++;
+
+		/* fill key */
+		if (p->key)
+			tmplen = snprintf(tmp, len - 1, "%s:", p->key);
+
+		BUF_POINTER_FORWARD;
+		/* fill value */
+		tmplen = 0;
+
+		value = p->value;
+		regular_value = hievent_make_regular(value);
+		if (!regular_value) {
+			regular_value = "NULL";
+			need_free = 0;
+		}
+		tmplen = snprintf(tmp, len - 1, "%s;", regular_value);
+		if ((value != regular_value) && need_free)
+			kfree(regular_value);
+
+		BUF_POINTER_FORWARD;
+		p = p->next;
+	}
+	return len;
+}
+
+static int hievent_convert_string(struct hiview_hievent *event, char **pbuf)
+{
+	int len;
+	char *tmp = NULL;
+	int tmplen;
+	unsigned int i;
+
+	char *buf = kmalloc(EVENT_INFO_BUF_LEN, GFP_KERNEL);
+
+	if (!buf) {
+		*pbuf = NULL;
+		return 0;
+	}
+
+	(void)memset(buf, 0, EVENT_INFO_BUF_LEN);
+	len = EVENT_INFO_BUF_LEN;
+	tmp = buf;
+
+	/* fill eventid */
+	tmplen = snprintf(tmp, len - 1, "eventid %d", event->eventid);
+	BUF_POINTER_FORWARD;
+
+	/* fill the path */
+	for (i = 0; i < MAX_PATH_NUMBER; i++) {
+		if (!event->file_path[i])
+			break;
+
+		tmplen = snprintf(tmp, len - 1, " -i %s", event->file_path[i]);
+		BUF_POINTER_FORWARD;
+	}
+
+	/* fill time */
+	if (event->time) {
+		tmplen = snprintf(tmp, len - 1, " -t %lld",  event->time);
+		BUF_POINTER_FORWARD;
+	}
+
+	/* fill the payload info */
+	len = hievent_fill_payload(event, pbuf, tmp, len);
+	*pbuf = buf;
+	return (EVENT_INFO_BUF_LEN - len);
+}
+
+#define IDAP_LOGTYPE_CMD 1
+static int hievent_write_logexception(char *str, const int strlen)
+{
+	char tempchr;
+	char *strptr = str;
+	int left_buf_len = strlen + 1;
+	int sent_cnt = 0;
+
+	while (left_buf_len > 0) {
+		if (left_buf_len > EVENT_INFO_PACK_BUF_LEN) {
+			tempchr = strptr[EVENT_INFO_PACK_BUF_LEN - 1];
+			strptr[EVENT_INFO_PACK_BUF_LEN - 1] = '\0';
+			logbuff_to_exception(0, 0, IDAP_LOGTYPE_CMD, 1, strptr,
+					     EVENT_INFO_PACK_BUF_LEN);