/* * drivers/dpm/policy.c  Dynamic Power Management Policies * * 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 2 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, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Copyright (C) 2002, International Business Machines Corporation * All Rights Reserved * * Robert Paulsen * IBM Linux Technology Center * rpaulsen@us.ibm.com * August, 2002 * *//* TODO:   Rethink init/enable/disable: It may be redundant and/or unsafe   Fix initialization and stats*/#include <linux/dpm.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/spinlock.h>#include <asm/semaphore.h>#include <asm/system.h>#include <asm/uaccess.h>// debug printout// #define TRACE 1#undef TRACE#if defined(TRACE)#define trace(args...) do { printk("TRACE: "); printk(args); } while(0)#else#define trace(args...) do {} while(0)#endif#define DPM_PP_SIZE (DPM_PP_NBR * sizeof(dpm_md_pp_t))struct dpm_stats dpm_state_stats[DPM_STATES];dpm_md_time_tdpm_update_stats(struct dpm_stats *new, struct dpm_stats *old){	dpm_md_time_t now = dpm_md_time();	old->end_time = now;	old->total_time += now - old->start_time;	new->start_time = now;	new->end_time = 0;	new->count += 1;	return now;}/***************************************************************************** * get a policy's statistics *****************************************************************************/intdpm_get_policy_stats(char *name, struct dpm_stats *stats){	struct dpm_policy *policy;	dpm_lock();	/* find the named policy */	list_find(policy, name, dpm_policies, struct dpm_policy);	if (!policy) {		dpm_unlock();		return -ENOENT;	}	*stats = policy->stats;	dpm_unlock();	return 0;}/***************************************************************************** * get a class's statistics *****************************************************************************/intdpm_get_class_stats(char *name, struct dpm_stats *stats){	struct dpm_class *cls;	dpm_lock();	/* find the named class */	list_find(cls, name, dpm_classes, struct dpm_class);	if (!cls) {		dpm_unlock();		return -ENOENT;	}	*stats = cls->stats;	dpm_unlock();	return 0;}/***************************************************************************** * get a operating point's statistics *****************************************************************************/intdpm_get_opt_stats(char *name, struct dpm_stats *stats){	struct dpm_opt *opt;	dpm_lock();	/* find the named opt */	list_find(opt, name, dpm_opts, struct dpm_opt);	if (!opt) {		dpm_unlock();		return -ENOENT;	}	*stats = opt->stats;	stats->total_time += dpm_md_time() - stats->start_time;	dpm_unlock();	return 0;}/***************************************************************************** * get statistics for all operating states *****************************************************************************/intdpm_get_os_stats(struct dpm_stats *stats){	unsigned long flags;	spin_lock_irqsave(&dpm_policy_lock, flags);	memcpy(stats, dpm_state_stats, DPM_STATES * sizeof (struct dpm_stats));	stats[dpm_active_state].total_time +=		dpm_md_time() - stats[dpm_active_state].start_time;	spin_unlock_irqrestore(&dpm_policy_lock, flags);	return 0;}EXPORT_SYMBOL(dpm_get_os_stats);voiddpm_init_stats(void) {	memset(dpm_state_stats, 0, DPM_STATES * sizeof (struct dpm_stats));#ifdef CONFIG_DPM_IDLE_STATS	dpm_init_idle_stats();#endif}#ifdef CONFIG_DPM_IDLE_STATSvoiddpm_init_idle_stats(void){	memset((void *)&idle_lats, 0, sizeof(struct dpm_idle_lats));}#endif