From 220a32f34b324263ac06ea46d5c88bf6aff13926 Mon Sep 17 00:00:00 2001
From: "qiankun.wang" <qiankun.wang@amlogic.com>
Date: Fri, 19 May 2023 15:26:35 +0800
Subject: [PATCH] sched: vts: vts_kernel_proc_file_api_test [2/2]

PD#SWPL-124519

Problem:
vts_kernel_proc_file_api_test module 3 fail

Solution:
add 3 proc file interfaces 'sched_latency_ns',
'sched_wakeup_granularity_ns',
'sched_tunable_scaling'

Verify:
SC2

Change-Id: I514cea758d73825252a14cb7c39e1f233d075f2e
Signed-off-by: qiankun.wang <qiankun.wang@amlogic.com>
---
 include/linux/sched/sysctl.h | 12 +++++++++++
 kernel/sched/fair.c          | 25 +++++++++++++++++++++
 kernel/sysctl.c              | 42 ++++++++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+)

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index d5ebdb6b79de..9b6ff6ac0e64 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -26,6 +26,11 @@ int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
 enum { sysctl_hung_task_timeout_secs = 0 };
 #endif
 
+#if IS_ENABLED(CONFIG_AMLOGIC_BGKI_SCHED_SYSCTL)
+extern unsigned int sysctl_sched_latency;
+extern unsigned int sysctl_sched_min_granularity;
+extern unsigned int sysctl_sched_wakeup_granularity;
+#endif
 extern unsigned int sysctl_sched_child_runs_first;
 
 enum sched_tunable_scaling {
@@ -35,6 +40,13 @@ enum sched_tunable_scaling {
 	SCHED_TUNABLESCALING_END,
 };
 
+#if IS_ENABLED(CONFIG_AMLOGIC_BGKI_SCHED_SYSCTL)
+extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
+
+int sched_proc_update_handler(struct ctl_table *table, int write,
+		void __user *buffer, size_t *length,
+		loff_t *ppos);
+#endif
 /*
  *  control realtime throttling:
  *
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c36c0ecc4f3a..f38c83638c33 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -644,6 +644,31 @@ int sched_update_scaling(void)
 
 	return 0;
 }
+
+#if IS_ENABLED(CONFIG_AMLOGIC_BGKI_SCHED_SYSCTL)
+int sched_proc_update_handler(struct ctl_table *table, int write,
+				void __user *buffer, size_t *lenp,
+				loff_t *ppos)
+{
+	int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+	unsigned int factor = get_update_sysctl_factor();
+
+	if (ret || !write)
+		return ret;
+
+	sched_nr_latency = DIV_ROUND_UP(sysctl_sched_latency,
+		sysctl_sched_min_granularity);
+
+#define WRT_SYSCTL(name) \
+	(normalized_sysctl_##name = sysctl_##name / (factor))
+	WRT_SYSCTL(sched_min_granularity);
+	WRT_SYSCTL(sched_latency);
+	WRT_SYSCTL(sched_wakeup_granularity);
+#undef WRT_SYSCTL
+
+	return 0;
+}
+#endif
 #endif
 
 /*
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 6842239eff5e..7f2eb9c4c964 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -183,6 +183,17 @@ static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
 int sysctl_legacy_va_layout;
 #endif
 
+#if IS_ENABLED(CONFIG_AMLOGIC_BGKI_SCHED_SYSCTL)
+static int min_sched_granularity_ns = 100000;           /* 100 usecs */
+static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
+static int min_wakeup_granularity_ns;                   /* 0 usecs */
+static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
+#ifdef CONFIG_SMP
+static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
+static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END - 1;
+#endif /* CONFIG_SMP */
+#endif
+
 #ifdef CONFIG_COMPACTION
 static int min_extfrag_threshold;
 static int max_extfrag_threshold = 1000;
@@ -1854,7 +1865,38 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= sched_rr_handler,
 	},
+#if IS_ENABLED(CONFIG_AMLOGIC_BGKI_SCHED_SYSCTL)
+	{
+		.procname       = "sched_latency_ns",
+		.data           = &sysctl_sched_latency,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = sched_proc_update_handler,
+		.extra1         = &min_sched_granularity_ns,
+		.extra2         = &max_sched_granularity_ns,
+	},
+	{
+		.procname       = "sched_wakeup_granularity_ns",
+		.data           = &sysctl_sched_wakeup_granularity,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = sched_proc_update_handler,
+		.extra1         = &min_wakeup_granularity_ns,
+		.extra2         = &max_wakeup_granularity_ns,
+	},
+#endif
 #ifdef CONFIG_SMP
+#if IS_ENABLED(CONFIG_AMLOGIC_BGKI_SCHED_SYSCTL)
+	{
+		.procname       = "sched_tunable_scaling",
+		.data           = &sysctl_sched_tunable_scaling,
+		.maxlen         = sizeof(enum sched_tunable_scaling),
+		.mode           = 0644,
+		.proc_handler   = sched_proc_update_handler,
+		.extra1         = &min_sched_tunable_scaling,
+		.extra2         = &max_sched_tunable_scaling,
+	},
+#endif
 	{
 		.procname	= "sched_pelt_multiplier",
 		.data		= &sysctl_sched_pelt_multiplier,