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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/array_size.h>
#include <linux/bitops.h>
#include <linux/cleanup.h>
#include <linux/console.h>
#include <linux/log2.h>
#include <linux/kernel.h>
#include <linux/ftrace.h>
#include <linux/nmi.h>
#include <linux/sched/debug.h>
#include <linux/string.h>
#include <linux/sysctl.h>
#include <linux/sys_info.h>
static const char * const si_names[] = {
[ilog2(SYS_INFO_TASKS)] = "tasks",
[ilog2(SYS_INFO_MEM)] = "mem",
[ilog2(SYS_INFO_TIMERS)] = "timers",
[ilog2(SYS_INFO_LOCKS)] = "locks",
[ilog2(SYS_INFO_FTRACE)] = "ftrace",
[ilog2(SYS_INFO_PANIC_CONSOLE_REPLAY)] = "",
[ilog2(SYS_INFO_ALL_BT)] = "all_bt",
[ilog2(SYS_INFO_BLOCKED_TASKS)] = "blocked_tasks",
};
/*
* Default kernel sys_info mask.
* If a kernel module calls sys_info() with "parameter == 0", then
* this mask will be used.
*/
static unsigned long kernel_si_mask;
/* Expecting string like "xxx_sys_info=tasks,mem,timers,locks,ftrace,..." */
unsigned long sys_info_parse_param(char *str)
{
unsigned long si_bits = 0;
char *s, *name;
int i;
s = str;
while ((name = strsep(&s, ",")) && *name) {
i = match_string(si_names, ARRAY_SIZE(si_names), name);
if (i >= 0)
__set_bit(i, &si_bits);
}
return si_bits;
}
#ifdef CONFIG_SYSCTL
static int sys_info_write_handler(const struct ctl_table *table,
void *buffer, size_t *lenp, loff_t *ppos,
unsigned long *si_bits_global)
{
unsigned long si_bits;
int ret;
ret = proc_dostring(table, 1, buffer, lenp, ppos);
if (ret)
return ret;
si_bits = sys_info_parse_param(table->data);
/* The access to the global value is not synchronized. */
WRITE_ONCE(*si_bits_global, si_bits);
return 0;
}
static int sys_info_read_handler(const struct ctl_table *table,
void *buffer, size_t *lenp, loff_t *ppos,
unsigned long *si_bits_global)
{
unsigned long si_bits;
unsigned int len = 0;
char *delim = "";
unsigned int i;
/* The access to the global value is not synchronized. */
si_bits = READ_ONCE(*si_bits_global);
for_each_set_bit(i, &si_bits, ARRAY_SIZE(si_names)) {
if (*si_names[i]) {
len += scnprintf(table->data + len, table->maxlen - len,
"%s%s", delim, si_names[i]);
delim = ",";
}
}
return proc_dostring(table, 0, buffer, lenp, ppos);
}
int sysctl_sys_info_handler(const struct ctl_table *ro_table, int write,
void *buffer, size_t *lenp,
loff_t *ppos)
{
struct ctl_table table;
unsigned int i;
size_t maxlen;
maxlen = 0;
for (i = 0; i < ARRAY_SIZE(si_names); i++)
maxlen += strlen(si_names[i]) + 1;
char *names __free(kfree) = kzalloc(maxlen, GFP_KERNEL);
if (!names)
return -ENOMEM;
table = *ro_table;
table.data = names;
table.maxlen = maxlen;
if (write)
return sys_info_write_handler(&table, buffer, lenp, ppos, ro_table->data);
else
return sys_info_read_handler(&table, buffer, lenp, ppos, ro_table->data);
}
static const struct ctl_table sys_info_sysctls[] = {
{
.procname = "kernel_sys_info",
.data = &kernel_si_mask,
.maxlen = sizeof(kernel_si_mask),
.mode = 0644,
.proc_handler = sysctl_sys_info_handler,
},
};
static int __init sys_info_sysctl_init(void)
{
register_sysctl_init("kernel", sys_info_sysctls);
return 0;
}
subsys_initcall(sys_info_sysctl_init);
#endif
static void __sys_info(unsigned long si_mask)
{
if (si_mask & SYS_INFO_TASKS)
show_state();
if (si_mask & SYS_INFO_MEM)
show_mem();
if (si_mask & SYS_INFO_TIMERS)
sysrq_timer_list_show();
if (si_mask & SYS_INFO_LOCKS)
debug_show_all_locks();
if (si_mask & SYS_INFO_FTRACE)
ftrace_dump(DUMP_ALL);
if (si_mask & SYS_INFO_ALL_BT)
trigger_all_cpu_backtrace();
if (si_mask & SYS_INFO_BLOCKED_TASKS)
show_state_filter(TASK_UNINTERRUPTIBLE);
}
void sys_info(unsigned long si_mask)
{
__sys_info(si_mask ? : kernel_si_mask);
}
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