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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* libcfs/libcfs/debug.c
*
* Author: Phil Schwan <phil@clusterfs.com>
*
*/
# define DEBUG_SUBSYSTEM S_LNET
#include <linux/libcfs/libcfs.h>
#include "tracefile.h"
static char debug_file_name[1024];
unsigned int libcfs_subsystem_debug = ~0;
EXPORT_SYMBOL(libcfs_subsystem_debug);
module_param(libcfs_subsystem_debug, int, 0644);
MODULE_PARM_DESC(libcfs_subsystem_debug, "Lustre kernel debug subsystem mask");
unsigned int libcfs_debug = (D_CANTMASK |
D_NETERROR | D_HA | D_CONFIG | D_IOCTL);
EXPORT_SYMBOL(libcfs_debug);
module_param(libcfs_debug, int, 0644);
MODULE_PARM_DESC(libcfs_debug, "Lustre kernel debug mask");
static int libcfs_param_debug_mb_set(const char *val,
const struct kernel_param *kp)
{
int rc;
unsigned int num;
rc = kstrtouint(val, 0, &num);
if (rc < 0)
return rc;
if (!*((unsigned int *)kp->arg)) {
*((unsigned int *)kp->arg) = num;
return 0;
}
rc = cfs_trace_set_debug_mb(num);
if (!rc)
*((unsigned int *)kp->arg) = cfs_trace_get_debug_mb();
return rc;
}
/* While debug_mb setting look like unsigned int, in fact
* it needs quite a bunch of extra processing, so we define special
* debugmb parameter type with corresponding methods to handle this case
*/
static const struct kernel_param_ops param_ops_debugmb = {
.set = libcfs_param_debug_mb_set,
.get = param_get_uint,
};
#define param_check_debugmb(name, p) \
__param_check(name, p, unsigned int)
static unsigned int libcfs_debug_mb;
module_param(libcfs_debug_mb, debugmb, 0644);
MODULE_PARM_DESC(libcfs_debug_mb, "Total debug buffer size.");
unsigned int libcfs_printk = D_CANTMASK;
module_param(libcfs_printk, uint, 0644);
MODULE_PARM_DESC(libcfs_printk, "Lustre kernel debug console mask");
unsigned int libcfs_console_ratelimit = 1;
module_param(libcfs_console_ratelimit, uint, 0644);
MODULE_PARM_DESC(libcfs_console_ratelimit, "Lustre kernel debug console ratelimit (0 to disable)");
static int param_set_delay_minmax(const char *val,
const struct kernel_param *kp,
long min, long max)
{
long d;
int sec;
int rc;
rc = kstrtoint(val, 0, &sec);
if (rc)
return -EINVAL;
d = cfs_time_seconds(sec) / 100;
if (d < min || d > max)
return -EINVAL;
*((unsigned int *)kp->arg) = d;
return 0;
}
static int param_get_delay(char *buffer, const struct kernel_param *kp)
{
unsigned int d = *(unsigned int *)kp->arg;
return sprintf(buffer, "%u", (unsigned int)cfs_duration_sec(d * 100));
}
unsigned int libcfs_console_max_delay;
unsigned int libcfs_console_min_delay;
static int param_set_console_max_delay(const char *val,
const struct kernel_param *kp)
{
return param_set_delay_minmax(val, kp,
libcfs_console_min_delay, INT_MAX);
}
static const struct kernel_param_ops param_ops_console_max_delay = {
.set = param_set_console_max_delay,
.get = param_get_delay,
};
#define param_check_console_max_delay(name, p) \
__param_check(name, p, unsigned int)
module_param(libcfs_console_max_delay, console_max_delay, 0644);
MODULE_PARM_DESC(libcfs_console_max_delay, "Lustre kernel debug console max delay (jiffies)");
static int param_set_console_min_delay(const char *val,
const struct kernel_param *kp)
{
return param_set_delay_minmax(val, kp,
1, libcfs_console_max_delay);
}
static const struct kernel_param_ops param_ops_console_min_delay = {
.set = param_set_console_min_delay,
.get = param_get_delay,
};
#define param_check_console_min_delay(name, p) \
__param_check(name, p, unsigned int)
module_param(libcfs_console_min_delay, console_min_delay, 0644);
MODULE_PARM_DESC(libcfs_console_min_delay, "Lustre kernel debug console min delay (jiffies)");
static int param_set_uint_minmax(const char *val,
const struct kernel_param *kp,
unsigned int min, unsigned int max)
{
unsigned int num;
int ret;
if (!val)
return -EINVAL;
ret = kstrtouint(val, 0, &num);
if (ret < 0 || num < min || num > max)
return -EINVAL;
*((unsigned int *)kp->arg) = num;
return 0;
}
static int param_set_uintpos(const char *val, const struct kernel_param *kp)
{
return param_set_uint_minmax(val, kp, 1, -1);
}
static const struct kernel_param_ops param_ops_uintpos = {
.set = param_set_uintpos,
.get = param_get_uint,
};
#define param_check_uintpos(name, p) \
__param_check(name, p, unsigned int)
unsigned int libcfs_console_backoff = CDEBUG_DEFAULT_BACKOFF;
module_param(libcfs_console_backoff, uintpos, 0644);
MODULE_PARM_DESC(libcfs_console_backoff, "Lustre kernel debug console backoff factor");
unsigned int libcfs_debug_binary = 1;
unsigned int libcfs_stack = 3 * THREAD_SIZE / 4;
EXPORT_SYMBOL(libcfs_stack);
unsigned int libcfs_catastrophe;
EXPORT_SYMBOL(libcfs_catastrophe);
unsigned int libcfs_panic_on_lbug = 1;
module_param(libcfs_panic_on_lbug, uint, 0644);
MODULE_PARM_DESC(libcfs_panic_on_lbug, "Lustre kernel panic on LBUG");
static wait_queue_head_t debug_ctlwq;
char libcfs_debug_file_path_arr[PATH_MAX] = LIBCFS_DEBUG_FILE_PATH_DEFAULT;
/* We need to pass a pointer here, but elsewhere this must be a const */
static char *libcfs_debug_file_path;
module_param(libcfs_debug_file_path, charp, 0644);
MODULE_PARM_DESC(libcfs_debug_file_path,
"Path for dumping debug logs, set 'NONE' to prevent log dumping");
int libcfs_panic_in_progress;
/* libcfs_debug_token2mask() expects the returned string in lower-case */
static const char *
libcfs_debug_subsys2str(int subsys)
{
static const char * const libcfs_debug_subsystems[] =
LIBCFS_DEBUG_SUBSYS_NAMES;
if (subsys >= ARRAY_SIZE(libcfs_debug_subsystems))
return NULL;
return libcfs_debug_subsystems[subsys];
}
/* libcfs_debug_token2mask() expects the returned string in lower-case */
static const char *
libcfs_debug_dbg2str(int debug)
{
static const char * const libcfs_debug_masks[] =
LIBCFS_DEBUG_MASKS_NAMES;
if (debug >= ARRAY_SIZE(libcfs_debug_masks))
return NULL;
return libcfs_debug_masks[debug];
}
int
libcfs_debug_mask2str(char *str, int size, int mask, int is_subsys)
{
const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
libcfs_debug_dbg2str;
int len = 0;
const char *token;
int i;
if (!mask) { /* "0" */
if (size > 0)
str[0] = '0';
len = 1;
} else { /* space-separated tokens */
for (i = 0; i < 32; i++) {
if (!(mask & (1 << i)))
continue;
token = fn(i);
if (!token) /* unused bit */
continue;
if (len > 0) { /* separator? */
if (len < size)
str[len] = ' ';
len++;
}
while (*token) {
if (len < size)
str[len] = *token;
token++;
len++;
}
}
}
/* terminate 'str' */
if (len < size)
str[len] = 0;
else
str[size - 1] = 0;
return len;
}
int
libcfs_debug_str2mask(int *mask, const char *str, int is_subsys)
{
const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
libcfs_debug_dbg2str;
int m = 0;
int matched;
int n;
int t;
/* Allow a number for backwards compatibility */
for (n = strlen(str); n > 0; n--)
if (!isspace(str[n - 1]))
break;
matched = n;
t = sscanf(str, "%i%n", &m, &matched);
if (t >= 1 && matched == n) {
/* don't print warning for lctl set_param debug=0 or -1 */
if (m && m != -1)
CWARN("You are trying to use a numerical value for the mask - this will be deprecated in a future release.\n");
*mask = m;
return 0;
}
return cfs_str2mask(str, fn, mask, is_subsys ? 0 : D_CANTMASK,
0xffffffff);
}
/**
* Dump Lustre log to ::debug_file_path by calling tracefile_dump_all_pages()
*/
void libcfs_debug_dumplog_internal(void *arg)
{
static time64_t last_dump_time;
time64_t current_time;
void *journal_info;
journal_info = current->journal_info;
current->journal_info = NULL;
current_time = ktime_get_real_seconds();
if (strncmp(libcfs_debug_file_path_arr, "NONE", 4) &&
current_time > last_dump_time) {
last_dump_time = current_time;
snprintf(debug_file_name, sizeof(debug_file_name) - 1,
"%s.%lld.%ld", libcfs_debug_file_path_arr,
(s64)current_time, (long)arg);
pr_alert("LustreError: dumping log to %s\n", debug_file_name);
cfs_tracefile_dump_all_pages(debug_file_name);
libcfs_run_debug_log_upcall(debug_file_name);
}
current->journal_info = journal_info;
}
static int libcfs_debug_dumplog_thread(void *arg)
{
libcfs_debug_dumplog_internal(arg);
wake_up(&debug_ctlwq);
return 0;
}
void libcfs_debug_dumplog(void)
{
wait_queue_entry_t wait;
struct task_struct *dumper;
/* we're being careful to ensure that the kernel thread is
* able to set our state to running as it exits before we
* get to schedule()
*/
init_waitqueue_entry(&wait, current);
add_wait_queue(&debug_ctlwq, &wait);
dumper = kthread_run(libcfs_debug_dumplog_thread,
(void *)(long)current_pid(),
"libcfs_debug_dumper");
set_current_state(TASK_INTERRUPTIBLE);
if (IS_ERR(dumper))
pr_err("LustreError: cannot start log dump thread: %ld\n",
PTR_ERR(dumper));
else
schedule();
/* be sure to teardown if cfs_create_thread() failed */
remove_wait_queue(&debug_ctlwq, &wait);
set_current_state(TASK_RUNNING);
}
EXPORT_SYMBOL(libcfs_debug_dumplog);
int libcfs_debug_init(unsigned long bufsize)
{
unsigned int max = libcfs_debug_mb;
int rc = 0;
init_waitqueue_head(&debug_ctlwq);
if (libcfs_console_max_delay <= 0 || /* not set by user or */
libcfs_console_min_delay <= 0 || /* set to invalid values */
libcfs_console_min_delay >= libcfs_console_max_delay) {
libcfs_console_max_delay = CDEBUG_DEFAULT_MAX_DELAY;
libcfs_console_min_delay = CDEBUG_DEFAULT_MIN_DELAY;
}
if (libcfs_debug_file_path) {
strlcpy(libcfs_debug_file_path_arr,
libcfs_debug_file_path,
sizeof(libcfs_debug_file_path_arr));
}
/* If libcfs_debug_mb is set to an invalid value or uninitialized
* then just make the total buffers smp_num_cpus * TCD_MAX_PAGES
*/
if (max > cfs_trace_max_debug_mb() || max < num_possible_cpus()) {
max = TCD_MAX_PAGES;
} else {
max = max / num_possible_cpus();
max <<= (20 - PAGE_SHIFT);
}
rc = cfs_tracefile_init(max);
if (!rc) {
libcfs_register_panic_notifier();
libcfs_debug_mb = cfs_trace_get_debug_mb();
}
return rc;
}
int libcfs_debug_cleanup(void)
{
libcfs_unregister_panic_notifier();
cfs_tracefile_exit();
return 0;
}
int libcfs_debug_clear_buffer(void)
{
cfs_trace_flush_pages();
return 0;
}
/* Debug markers, although printed by S_LNET should not be be marked as such. */
#undef DEBUG_SUBSYSTEM
#define DEBUG_SUBSYSTEM S_UNDEFINED
int libcfs_debug_mark_buffer(const char *text)
{
CDEBUG(D_TRACE,
"***************************************************\n");
LCONSOLE(D_WARNING, "DEBUG MARKER: %s\n", text);
CDEBUG(D_TRACE,
"***************************************************\n");
return 0;
}
#undef DEBUG_SUBSYSTEM
#define DEBUG_SUBSYSTEM S_LNET
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