From 4e8841e155560026d620542d4307a8a95915a68b Mon Sep 17 00:00:00 2001
From: Liang Chen <cl@rock-chips.com>
Date: Tue, 13 Sep 2022 10:11:17 +0800
Subject: [PATCH] sched: cpufreq_schedutil: add attribute for change
 target_load

Default target_load is 80% and change it by the follow command:

echo 65 > /sys/devices/system/cpu/cpu0/cpufreq/schedutil/target_load

Change-Id: Icb02c36eab345a3f2e2d065fba76fdc015f47fa4
Signed-off-by: Liang Chen <cl@rock-chips.com>
---
 kernel/sched/cpufreq_schedutil.c | 41 ++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index b365895c2e2e..26cf3c3d7032 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -19,6 +19,9 @@
 struct sugov_tunables {
 	struct gov_attr_set	attr_set;
 	unsigned int		rate_limit_us;
+#ifdef CONFIG_ARCH_ROCKCHIP
+	unsigned int		target_load;
+#endif
 };
 
 struct sugov_policy {
@@ -170,7 +173,11 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy,
 	if (next_freq)
 		freq = next_freq;
 	else
+#ifdef CONFIG_ARCH_ROCKCHIP
+		freq = div64_ul((u64)(100 * freq / sg_policy->tunables->target_load) * util, max);
+#else
 		freq = map_util_freq(util, freq, max);
+#endif
 
 	if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)
 		return sg_policy->next_freq;
@@ -612,8 +619,39 @@ rate_limit_us_store(struct gov_attr_set *attr_set, const char *buf, size_t count
 
 static struct governor_attr rate_limit_us = __ATTR_RW(rate_limit_us);
 
+#ifdef CONFIG_ARCH_ROCKCHIP
+static ssize_t target_load_show(struct gov_attr_set *attr_set, char *buf)
+{
+	struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
+
+	return sprintf(buf, "%u\n", tunables->target_load);
+}
+
+static ssize_t
+target_load_store(struct gov_attr_set *attr_set, const char *buf, size_t count)
+{
+	struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
+	unsigned int target_load;
+
+	if (kstrtouint(buf, 10, &target_load))
+		return -EINVAL;
+
+	if (!target_load || (target_load > 100))
+		return -EINVAL;
+
+	tunables->target_load = target_load;
+
+	return count;
+}
+
+static struct governor_attr target_load = __ATTR_RW(target_load);
+#endif
+
 static struct attribute *sugov_attrs[] = {
 	&rate_limit_us.attr,
+#ifdef CONFIG_ARCH_ROCKCHIP
+	&target_load.attr,
+#endif
 	NULL
 };
 ATTRIBUTE_GROUPS(sugov);
@@ -777,6 +815,9 @@ static int sugov_init(struct cpufreq_policy *policy)
 	}
 
 	tunables->rate_limit_us = cpufreq_policy_transition_delay_us(policy);
+#ifdef CONFIG_ARCH_ROCKCHIP
+	tunables->target_load = 80;
+#endif
 
 	policy->governor_data = sg_policy;
 	sg_policy->tunables = tunables;