linux-stable/arch/powerpc/platforms/cell/cpufreq_spudemand.c
Ingo Molnar 4f17722c72 sched/headers: Prepare for new header dependencies before moving code to <linux/sched/loadavg.h>
We are going to split <linux/sched/loadavg.h> out of <linux/sched.h>, which
will have to be picked up from a couple of .c files.

Create a trivial placeholder <linux/sched/topology.h> file that just
maps to <linux/sched.h> to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-03-02 08:42:27 +01:00

168 lines
4.1 KiB
C

/*
* spu aware cpufreq governor for the cell processor
*
* © Copyright IBM Corporation 2006-2008
*
* Author: Christian Krafft <krafft@de.ibm.com>
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/cpufreq.h>
#include <linux/sched.h>
#include <linux/sched/loadavg.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <asm/machdep.h>
#include <asm/spu.h>
#define POLL_TIME 100000 /* in µs */
#define EXP 753 /* exp(-1) in fixed-point */
struct spu_gov_info_struct {
unsigned long busy_spus; /* fixed-point */
struct cpufreq_policy *policy;
struct delayed_work work;
unsigned int poll_int; /* µs */
};
static DEFINE_PER_CPU(struct spu_gov_info_struct, spu_gov_info);
static int calc_freq(struct spu_gov_info_struct *info)
{
int cpu;
int busy_spus;
cpu = info->policy->cpu;
busy_spus = atomic_read(&cbe_spu_info[cpu_to_node(cpu)].busy_spus);
CALC_LOAD(info->busy_spus, EXP, busy_spus * FIXED_1);
pr_debug("cpu %d: busy_spus=%d, info->busy_spus=%ld\n",
cpu, busy_spus, info->busy_spus);
return info->policy->max * info->busy_spus / FIXED_1;
}
static void spu_gov_work(struct work_struct *work)
{
struct spu_gov_info_struct *info;
int delay;
unsigned long target_freq;
info = container_of(work, struct spu_gov_info_struct, work.work);
/* after cancel_delayed_work_sync we unset info->policy */
BUG_ON(info->policy == NULL);
target_freq = calc_freq(info);
__cpufreq_driver_target(info->policy, target_freq, CPUFREQ_RELATION_H);
delay = usecs_to_jiffies(info->poll_int);
schedule_delayed_work_on(info->policy->cpu, &info->work, delay);
}
static void spu_gov_init_work(struct spu_gov_info_struct *info)
{
int delay = usecs_to_jiffies(info->poll_int);
INIT_DEFERRABLE_WORK(&info->work, spu_gov_work);
schedule_delayed_work_on(info->policy->cpu, &info->work, delay);
}
static void spu_gov_cancel_work(struct spu_gov_info_struct *info)
{
cancel_delayed_work_sync(&info->work);
}
static int spu_gov_start(struct cpufreq_policy *policy)
{
unsigned int cpu = policy->cpu;
struct spu_gov_info_struct *info = &per_cpu(spu_gov_info, cpu);
struct spu_gov_info_struct *affected_info;
int i;
if (!cpu_online(cpu)) {
printk(KERN_ERR "cpu %d is not online\n", cpu);
return -EINVAL;
}
if (!policy->cur) {
printk(KERN_ERR "no cpu specified in policy\n");
return -EINVAL;
}
/* initialize spu_gov_info for all affected cpus */
for_each_cpu(i, policy->cpus) {
affected_info = &per_cpu(spu_gov_info, i);
affected_info->policy = policy;
}
info->poll_int = POLL_TIME;
/* setup timer */
spu_gov_init_work(info);
return 0;
}
static void spu_gov_stop(struct cpufreq_policy *policy)
{
unsigned int cpu = policy->cpu;
struct spu_gov_info_struct *info = &per_cpu(spu_gov_info, cpu);
int i;
/* cancel timer */
spu_gov_cancel_work(info);
/* clean spu_gov_info for all affected cpus */
for_each_cpu (i, policy->cpus) {
info = &per_cpu(spu_gov_info, i);
info->policy = NULL;
}
}
static struct cpufreq_governor spu_governor = {
.name = "spudemand",
.start = spu_gov_start,
.stop = spu_gov_stop,
.owner = THIS_MODULE,
};
/*
* module init and destoy
*/
static int __init spu_gov_init(void)
{
int ret;
ret = cpufreq_register_governor(&spu_governor);
if (ret)
printk(KERN_ERR "registration of governor failed\n");
return ret;
}
static void __exit spu_gov_exit(void)
{
cpufreq_unregister_governor(&spu_governor);
}
module_init(spu_gov_init);
module_exit(spu_gov_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");