From 72fc78c2f8f9f1e551d0c59711fb9ca34dec9d33 Mon Sep 17 00:00:00 2001
From: Hareesh Gundu <hareeshg@codeaurora.org>
Date: Fri, 10 Jul 2020 20:44:33 +0530
Subject: [PATCH] msm: kgsl: Add support to configure bus dcvs sampling
 interval

Add support to configure bus dcvs sampling interval through the
sysfs entry. Also expose cur_ab vote value to sysfs.

$ echo 25000 > /sys/class/devfreq/soc:qcom,kgsl-busmon/sampling_interval
$ cat /sys/class/devfreq/soc:qcom,kgsl-busmon/cur_ab .

Change-Id: I77df55de2766d3fd818c27f717cfc4ae598bb0bd
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
---
 drivers/gpu/msm/governor_gpubw_mon.c | 66 +++++++++++++++++++++++++++-
 drivers/gpu/msm/msm_adreno_devfreq.h |  1 +
 2 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/msm/governor_gpubw_mon.c b/drivers/gpu/msm/governor_gpubw_mon.c
index cb120cef6023..f6e41577ca95 100644
--- a/drivers/gpu/msm/governor_gpubw_mon.c
+++ b/drivers/gpu/msm/governor_gpubw_mon.c
@@ -31,6 +31,61 @@ static void _update_cutoff(struct devfreq_msm_adreno_tz_data *priv,
 	}
 }
 
+static ssize_t cur_ab_show(struct device *dev,
+	struct device_attribute *attr,
+	char *buf)
+{
+	struct devfreq *df = to_devfreq(dev);
+	struct msm_busmon_extended_profile *bus_profile = container_of(
+					(df->profile),
+					struct msm_busmon_extended_profile,
+					profile);
+
+	return scnprintf(buf, PAGE_SIZE, "%llu\n", bus_profile->ab_mbytes);
+}
+
+static ssize_t sampling_interval_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct devfreq *df = to_devfreq(dev);
+	struct msm_busmon_extended_profile *bus_profile = container_of(
+					(df->profile),
+					struct msm_busmon_extended_profile,
+					profile);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", bus_profile->sampling_ms);
+}
+
+static ssize_t sampling_interval_store(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct devfreq *df = to_devfreq(dev);
+	struct msm_busmon_extended_profile *bus_profile = container_of(
+					(df->profile),
+					struct msm_busmon_extended_profile,
+					profile);
+	u32 value;
+	int ret;
+
+	ret = kstrtou32(buf, 0, &value);
+	if (ret)
+		return ret;
+
+	bus_profile->sampling_ms = value;
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(sampling_interval);
+static DEVICE_ATTR_RO(cur_ab);
+
+static const struct device_attribute *gpubw_attr_list[] = {
+	&dev_attr_sampling_interval,
+	&dev_attr_cur_ab,
+	NULL
+};
+
 static int devfreq_gpubw_get_target(struct devfreq *df,
 				unsigned long *freq)
 {
@@ -70,7 +125,7 @@ static int devfreq_gpubw_get_target(struct devfreq *df,
 	priv->bus.ram_time += b.ram_time;
 	priv->bus.ram_wait += b.ram_wait;
 
-	if (priv->bus.total_time < LONG_FLOOR)
+	if (priv->bus.total_time < bus_profile->sampling_ms)
 		return result;
 
 	norm_max_cycles = (unsigned int)(priv->bus.ram_time) /
@@ -174,12 +229,21 @@ static int gpubw_start(struct devfreq *devfreq)
 		priv->bus.p_up[priv->bus.num - 1] = 100;
 	_update_cutoff(priv, priv->bus.max);
 
+	bus_profile->sampling_ms = LONG_FLOOR;
+
+	for (i = 0; gpubw_attr_list[i] != NULL; i++)
+		device_create_file(&devfreq->dev, gpubw_attr_list[i]);
+
 	return 0;
 }
 
 static int gpubw_stop(struct devfreq *devfreq)
 {
 	struct devfreq_msm_adreno_tz_data *priv = devfreq->data;
+	int i;
+
+	for (i = 0; gpubw_attr_list[i] != NULL; i++)
+		device_remove_file(&devfreq->dev, gpubw_attr_list[i]);
 
 	if (priv) {
 		kfree(priv->bus.up);
diff --git a/drivers/gpu/msm/msm_adreno_devfreq.h b/drivers/gpu/msm/msm_adreno_devfreq.h
index 465a960e16fd..58789dcea43b 100644
--- a/drivers/gpu/msm/msm_adreno_devfreq.h
+++ b/drivers/gpu/msm/msm_adreno_devfreq.h
@@ -78,6 +78,7 @@ struct msm_adreno_extended_profile {
 
 struct msm_busmon_extended_profile {
 	u32 flag;
+	u32 sampling_ms;
 	unsigned long percent_ab;
 	unsigned long ab_mbytes;
 	struct devfreq_msm_adreno_tz_data *private_data;