b666a7e42a
Add snapshot of runqueue stats module as of commit <e56fe938419e> (Merge "uapi: Introduce V4L2_FLAG_CVPMETADATA_SKIP flag"). Added #ifdefery to allow rq_stats to actually be optional. Change-Id: I3352a472c5b0ad61cc04317a1d6f26549bfcdc04 Signed-off-by: Elliot Berman <eberman@codeaurora.org>
109 lines
2.3 KiB
C
109 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2010-2015, 2017, 2019, The Linux Foundation. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/rq_stats.h>
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#define MAX_LONG_SIZE 24
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#define DEFAULT_DEF_TIMER_JIFFIES 5
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struct rq_data rq_info;
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struct workqueue_struct *rq_wq;
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spinlock_t rq_lock;
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static void def_work_fn(struct work_struct *work)
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{
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/* Notify polling threads on change of value */
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sysfs_notify(rq_info.kobj, NULL, "def_timer_ms");
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}
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static ssize_t show_def_timer_ms(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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int64_t diff;
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unsigned int udiff;
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diff = ktime_to_ns(ktime_get()) - rq_info.def_start_time;
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do_div(diff, 1000 * 1000);
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udiff = (unsigned int) diff;
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return snprintf(buf, MAX_LONG_SIZE, "%u\n", udiff);
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}
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static ssize_t store_def_timer_ms(struct kobject *kobj,
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struct kobj_attribute *attr, const char *buf, size_t count)
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{
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unsigned int val = 0;
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if (kstrtouint(buf, 0, &val))
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return -EINVAL;
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rq_info.def_timer_jiffies = msecs_to_jiffies(val);
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rq_info.def_start_time = ktime_to_ns(ktime_get());
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return count;
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}
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static struct kobj_attribute def_timer_ms_attr =
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__ATTR(def_timer_ms, 0600, show_def_timer_ms,
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store_def_timer_ms);
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static struct attribute *rq_attrs[] = {
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&def_timer_ms_attr.attr,
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NULL,
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};
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static struct attribute_group rq_attr_group = {
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.attrs = rq_attrs,
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};
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static int init_rq_attribs(void)
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{
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int err;
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rq_info.attr_group = &rq_attr_group;
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/* Create /sys/devices/system/cpu/cpu0/rq-stats/... */
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rq_info.kobj = kobject_create_and_add("rq-stats",
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&get_cpu_device(0)->kobj);
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if (!rq_info.kobj)
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return -ENOMEM;
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err = sysfs_create_group(rq_info.kobj, rq_info.attr_group);
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if (err)
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kobject_put(rq_info.kobj);
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else
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kobject_uevent(rq_info.kobj, KOBJ_ADD);
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return err;
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}
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static int __init msm_rq_stats_init(void)
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{
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int ret;
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#ifndef CONFIG_SMP
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/* Bail out if this is not an SMP Target */
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rq_info.init = 0;
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return -EPERM;
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#endif
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rq_wq = create_singlethread_workqueue("rq_stats");
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WARN_ON(!rq_wq);
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INIT_WORK(&rq_info.def_timer_work, def_work_fn);
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spin_lock_init(&rq_lock);
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rq_info.def_timer_jiffies = DEFAULT_DEF_TIMER_JIFFIES;
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rq_info.def_timer_last_jiffy = 0;
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ret = init_rq_attribs();
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rq_info.init = 1;
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return ret;
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}
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late_initcall(msm_rq_stats_init);
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