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/*
* Copyright (c) 2014-2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <kern/atomic.h>
#include <kern/init.h>
#include <kern/list.h>
#include <kern/mutex.h>
#include <kern/shell.h>
#include <kern/spinlock.h>
#include <kern/syscnt.h>
#include <kern/thread.h>
/*
* Global list of all registered counters.
*/
static struct list syscnt_list;
static struct mutex syscnt_lock;
#ifdef CONFIG_SHELL
static void
syscnt_shell_info(int argc, char **argv)
{
char *prefix;
prefix = (argc >= 2) ? argv[1] : NULL;
syscnt_info(prefix);
}
static struct shell_cmd syscnt_shell_cmds[] = {
SHELL_CMD_INITIALIZER("syscnt_info", syscnt_shell_info,
"syscnt_info [<prefix>]",
"display information about system counters"),
};
static int __init
syscnt_setup_shell(void)
{
SHELL_REGISTER_CMDS(syscnt_shell_cmds);
return 0;
}
INIT_OP_DEFINE(syscnt_setup_shell,
INIT_OP_DEP(shell_setup, true),
INIT_OP_DEP(syscnt_setup, true));
#endif /* CONFIG_SHELL */
static int __init
syscnt_setup(void)
{
list_init(&syscnt_list);
mutex_init(&syscnt_lock);
return 0;
}
/*
* Do not make initialization depend on mutex_setup, since mutex
* modules may use system counters for debugging.
*/
INIT_OP_DEFINE(syscnt_setup,
INIT_OP_DEP(mutex_bootstrap, true),
INIT_OP_DEP(spinlock_setup, true));
void __init
syscnt_register(struct syscnt *syscnt, const char *name)
{
#ifndef ATOMIC_HAVE_64B_OPS
spinlock_init(&syscnt->lock);
#endif
syscnt->value = 0;
strlcpy(syscnt->name, name, sizeof(syscnt->name));
mutex_lock(&syscnt_lock);
list_insert_tail(&syscnt_list, &syscnt->node);
mutex_unlock(&syscnt_lock);
}
void
syscnt_info(const char *prefix)
{
struct syscnt *syscnt;
size_t length, prefix_length;
uint64_t value;
prefix_length = (prefix == NULL) ? 0 : strlen(prefix);
mutex_lock(&syscnt_lock);
list_for_each_entry(&syscnt_list, syscnt, node) {
if (prefix_length != 0) {
length = strlen(syscnt->name);
if ((length < prefix_length)
|| (memcmp(syscnt->name, prefix, prefix_length) != 0)) {
continue;
}
}
value = syscnt_read(syscnt);
printf("syscnt: %40s %20llu\n", syscnt->name,
(unsigned long long)value);
}
mutex_unlock(&syscnt_lock);
}
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