/**
@function: static int __init srecorder_init(void)
@brief: dump
@param: reason
@return: none
@note:
**/
static int __init srecorder_init(void)
{
SRECORDER_PRINTK("Initialization %016lx %016lx.\n", params[0], params[1]);
srecorder_init_symbols();
srecorder_init_dev();
srecorder_ioremap_dts_memory();
srecorder_init_log_headers();
srecorder_resigter_notifiers();
#ifdef CONFIG_KPROBES
srecorder_resigter_jprobes();
#endif
srecorder_enable_log_category_flags();
srecorder_enable_log_type_flags();
SRECORDER_PRINTK("Initialization done.\n");
return 0;
}
/**
@function: int srecorder_save_log(char *file_path, char *pbuf, int data_len)
@brief: 在内核中将信息保存到文件中
@param: file_path 文件路径
@param: pbuf 存放信息的内存起始地址
@param: pbuf 要保存的数据长度
@return: 0 - 成功；-1-失败
@note:
*/
int srecorder_save_log(char *file_path, char *pbuf, int data_len)
{
mm_segment_t old_fs;
loff_t pos;
struct file *fp;
if (NULL == file_path || NULL == pbuf || data_len <= 0)
{
SRECORDER_PRINTK("File [%s] line [%d] invalid param!\n", __FILE__, __LINE__);
return -1;
}
/*0644文件读写执行权限，所有者:读写、用户组:读、其他:读*/
fp = filp_open(file_path, O_WRONLY | O_CREAT, 0644);
if (NULL != fp)
{
old_fs = get_fs();
set_fs(KERNEL_DS);
pos = 0;
vfs_write(fp, pbuf, data_len, &pos);
/*
char buf[1024];
memset(buf, 0, sizeof(buf));
pos = 0;
vfs_read(fp, buf, sizeof(buf) - 1, &pos);*/
filp_close(fp, NULL);
set_fs(old_fs);
}
return 0;
}
/**
@function: int srecorder_get_crash_time(srecorder_reserved_mem_info_for_log_t *pmem_info)
@brief: 记录死机发生的时间，顺便记录死机的原因。
@param: pmem_info SRecorder的保留内存信息
@return: 0 - 成功；-1-失败
@note:
*/
int srecorder_get_crash_time(srecorder_reserved_mem_info_t *pmem_info)
{
struct timeval tv;
/* struct timex txc; */
struct rtc_time tm;
int bytes_read = 0;
char *pbuf = NULL;
psrecorder_info_header_t pinfo_header = NULL;
if (unlikely(NULL == pmem_info))
{
SRECORDER_PRINTK("File [%s] line [%d] invalid param or kernel symbol addr!\n", __FILE__, __LINE__);
return -1;
}
if (srecorder_get_bit(CRASH_REASON_TIME))
{
SRECORDER_PRINTK("Crash reason and time have been dumped successfully!\n");
return 0;
}
memset(&tv, 0, sizeof(struct timeval));
/* memset(&txc, 0, sizeof(struct timex)); */
memset(&tm, 0, sizeof(struct rtc_time));
if (0 != srecorder_write_info_header(pmem_info, CRASH_REASON_TIME, &pinfo_header))
{
return -1;
}
do_gettimeofday(&tv);
tv.tv_sec -= sys_tz.tz_minuteswest * 60; /* 一分钟=60秒 */
rtc_time_to_tm(tv.tv_sec, &tm);
pbuf = pmem_info->start_addr + pmem_info->bytes_read;
bytes_read = SRECORDER_SNPRINTF(pmem_info->start_addr + pmem_info->bytes_read, pmem_info->bytes_left,
"Crash reason: %s %s Crash Time: %04d%02d%02d-%02d:%02d:%02d\n",
(NULL == pmem_info->crash_reason1) ? ("") : (pmem_info->crash_reason1),
(NULL == pmem_info->crash_reason2) ? ("") : (pmem_info->crash_reason2),
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
srecorder_renew_meminfo(pmem_info, bytes_read);
srecorder_validate_info_header(pinfo_header, pmem_info->bytes_per_type);
return 0;
}
/**
@function: int srecorder_validate_info_header(srecorder_info_header_t *pheader, unsigned long data_len)
@brief: 对各种定位信息的头部并进行校验
@param: pheader 各类信息的校验头
@param: data_len 每类信息的数据长度，不包括校验头的数据
@return: 0 - 成功；-1-失败
@note:
*/
int srecorder_validate_info_header(srecorder_info_header_t *pheader, unsigned long data_len)
{
#ifndef CONFIG_SRECORDER_DUMP_LOG_TO_STORAGECARD
unsigned long buf[2] = {0, 0};
if (unlikely(NULL == pheader))
{
SRECORDER_PRINTK("File [%s] line [%d] invalid param!\n", __FILE__, __LINE__);
return -1;
}
pheader->data_len = data_len;
buf[0] = (unsigned long)pheader->type;
buf[1] = (unsigned long)pheader->data_len;
pheader->crc32 = srecorder_get_crc32((unsigned char *)buf, sizeof(buf));
#endif
return 0;
}
/**
@function:int srecorder_write_info_header(srecorder_reserved_mem_info_for_log_t *pmem_info,
srecorder_info_type_e type,
psrecorder_info_header_t *pinfo_header)
@brief: 初始化给类信息的头部数据结构
@param: pmem_info SRecorder的保留内存信息
@param: type 信息类型
@param: pinfo_header 信息头部校验数据结构
@return: 0 - 成功；-1-失败
@note:
*/
int srecorder_write_info_header(srecorder_reserved_mem_info_t *pmem_info,
srecorder_info_type_e type,
psrecorder_info_header_t *pinfo_header)
{
int bytes_read = 0;
/* 删除此处定义 */
#ifndef CONFIG_SRECORDER_DUMP_LOG_TO_STORAGECARD
int info_header_size = sizeof(srecorder_info_header_t);
#endif
if (unlikely(NULL == pmem_info || NULL == pmem_info->start_addr || NULL == pinfo_header
|| (LOG_TYPE_COUNT <= (int)type || (int)type < 0)))
{
SRECORDER_PRINTK("File [%s] line [%d] invalid param!\n", __FILE__, __LINE__);
return -1;
}
#ifndef CONFIG_SRECORDER_DUMP_LOG_TO_STORAGECARD
/*把校验信息的头部结构留出来*/
/* 删除此处 */
if ((pmem_info->bytes_read + info_header_size) > pmem_info->mem_size)
{
return -1;
}
*pinfo_header = (psrecorder_info_header_t)(pmem_info->start_addr + pmem_info->bytes_read);
memset(*pinfo_header, 0, info_header_size);
((psrecorder_info_header_t)*pinfo_header)->type = type;
pmem_info->bytes_read += (info_header_size);
#endif
pmem_info->bytes_per_type = 0;
bytes_read = SRECORDER_SNPRINTF(pmem_info->start_addr + pmem_info->bytes_read, pmem_info->bytes_left,
"%s\n", s_srecorder_head_info[type].desciprion);
srecorder_renew_meminfo(pmem_info, bytes_read);
return 0;
}
/**
@function: int srecorder_get_modem_log(srecorder_reserved_mem_info_for_log_t *pmem_info)
@brief: 读取modem死机堆栈和运行日志
@param: pmem_info SRecorder的保留内存信息
@return: 0 - 成功；-1-失败
@note:
*/
int srecorder_get_modem_log(srecorder_reserved_mem_info_t *pmem_info)
{
psrecorder_info_header_t pinfo_header = NULL;
if (unlikely(NULL == pmem_info))
{
SRECORDER_PRINTK("File [%s] line [%d] invalid param or kernel symbol addr!\n", __FILE__, __LINE__);
return -1;
}
if (srecorder_log_has_been_dumped(MODEM_ERR_BIT7))
{
SRECORDER_PRINTK("modem err has been dumped successfully!\n");
}
if (srecorder_log_has_been_dumped(MODEM_ERR_F3_BIT8))
{
SRECORDER_PRINTK("modem err f3 has been dumped successfully!\n");
}
if (pmem_info->dump_modem_crash_log_only)
{
#if defined(CONFIG_DUMP_MODEM_LOG_BY_FIQ)
if (pmem_info->do_delay_when_dump_modem_log)
{
/* do delay about 10ms */
unsigned long ips = 0;
ips = cpufreq_get_directly(smp_processor_id()) * 1000; /* KHZ = 1000*/
if (unlikely(0x0 == ips))
{
ips = CONFIG_CPU_FREQ_DEFAULT_VALUE;
}
if (likely(0x0 != CONFIG_DUMP_MODEM_LOG_DELAY_MAX_MS))
{
srecorder_do_delay(ips / (1000 / CONFIG_DUMP_MODEM_LOG_DELAY_MAX_MS));
}
}
#endif
#if !defined(CONFIG_ARCH_MSM8930)
if (!srecorder_log_has_been_dumped(MODEM_ERR_BIT7))
{
if (0 != srecorder_write_info_header(pmem_info, MODEM_ERR_BIT7, &pinfo_header))
{
return -1;
}
srecorder_debug_modem_err(pmem_info);
srecorder_validate_info_header(pinfo_header, pmem_info->bytes_per_type);
}
#else
#endif
#if !defined(CONFIG_ARCH_MSM8930)
if (!srecorder_log_has_been_dumped(MODEM_ERR_F3_BIT8))
{
if (0 != srecorder_write_info_header(pmem_info, MODEM_ERR_F3_BIT8, &pinfo_header))
{
return -1;
}
srecorder_debug_modem_err_f3(pmem_info);
srecorder_validate_info_header(pinfo_header, pmem_info->bytes_per_type);
}
#else
#endif
}
return 0;
}
/**
@function: static int srecorder_get_symbol_kallsyms_lookup_name(const char *line, int len)
@brief: 给s_kernel_symbols_table表中的内核符号找到对应的地址
@param: line - 在/proc/kallsyms中所读的一行内容
@param: len - 暂时没用
@return: 0 - 成功；<0-失败
@note:
*/
static int srecorder_get_symbol_kallsyms_lookup_name(const char *line, int len)
{
int ret = 0;
srec_ksym_addr_t address;
char *psymbolname = NULL;
char *pmodulename = NULL;
char dummy;
if (NULL == line)
{
SRECORDER_PRINTK("File [%s] line [%d] invalid param!\n", __FILE__, __LINE__);
return -EINVAL;
}
psymbolname = kmalloc(NAME_MAX, GFP_KERNEL);
if (NULL == psymbolname)
{
ret = -ENOMEM;
goto err_out;
}
pmodulename = kmalloc(NAME_MAX, GFP_KERNEL);
if (NULL == pmodulename)
{
ret = -ENOMEM;
goto err_out;
}
memset(psymbolname, 0, NAME_MAX);
memset(pmodulename, 0, NAME_MAX);
/*
* 包含kallsyms_lookup_name的line的格式为"[address] [type] [symboleName]"
* 遇到"[address] [type] [symboleName] [moduleName]"格式直接返回
* /proc/kallsyms中每行一般3个参数
*/
if (3 != sscanf(line, "%lx %c %s [%s]", &address, &dummy, psymbolname, pmodulename))
{
ret = -ENOENT;
goto err_out;
}
/*判断是否是需要的符号kallsyms_lookup_name*/
if (strncmp(KALLSYMS_LOOKUP_NAME_FUNC, psymbolname, NAME_MAX) != 0)
{
ret = -ENOENT;
goto err_out;
}
s_kallsyms_lookup_name = (kallsyms_lookup_name_func)address;
ret = 0;
err_out:
if (NULL != psymbolname)
{
kfree(psymbolname);
psymbolname = NULL;
}
if (NULL != pmodulename)
{
kfree(pmodulename);
pmodulename = NULL;
}
return ret;
}
/**
@function: int srecorder_register_external_log(unsigned id, void(*callback)(void*))
@brief:
@param:
@return:
@note:
**/
int srecorder_register_external_log(unsigned id, void(*callback)(void*))
{
log_registration_entry_t* tmp_entry = NULL;
log_registration_entry_t* log_entry = NULL;
if (external_flag == 0)
{
SRECORDER_PRINTK("The dump flag of external log isn't enabled\n");
return -1;
}
if (id == 0 || callback == NULL)
{
return -1;
}
/* allocate one entry first to safely use spinlock */
log_entry = kzalloc(sizeof(log_registration_entry_t), GFP_KERNEL);
if (log_entry == NULL)
{
return -1;
}
if (spin_trylock(&srecorder_registration_lock) == 0)
{
goto out;
}
if (spin_trylock(&srecorder_list_lock) == 0)
{
goto reg_out;
}
tmp_entry = p_log_registration_list;
while (tmp_entry != NULL)
{
if (tmp_entry->info.log_id == id)
{
goto list_out;
}
tmp_entry = tmp_entry->next;
}
log_entry->info.log_id = id;
log_entry->callback = callback;
log_entry->next = p_log_registration_list;
p_log_registration_list = log_entry;
spin_unlock(&srecorder_list_lock);
spin_unlock(&srecorder_registration_lock);
return 0;
list_out:
spin_unlock(&srecorder_list_lock);
reg_out:
spin_unlock(&srecorder_registration_lock);
out:
kfree(log_entry);
return -1;
}
