MALI: midgard: rockchip: add sysfs files to get GPU utilisation

Change-Id: I758369bdd9ef945a89fd87fd7a69bd9f391f0880
Signed-off-by: chenzhen <chenzhen@rock-chips.com>

2 files changed, 132 insertions, 8 deletions

diff --git a/drivers/gpu/arm/midgard/platform/rk/mali_kbase_config_rk.c b/drivers/gpu/arm/midgard/platform/rk/mali_kbase_config_rk.c
index 62d477dd961e..f7c0a66e3879 100644
--- a/drivers/gpu/arm/midgard/platform/rk/mali_kbase_config_rk.c
+++ b/drivers/gpu/arm/midgard/platform/rk/mali_kbase_config_rk.c
@@ -14,10 +14,12 @@
 #include <mali_kbase.h>
 #include <mali_kbase_defs.h>
 #include <mali_kbase_config.h>
+#include <backend/gpu/mali_kbase_pm_internal.h>
 
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
 #include <linux/of.h>
+#include <linux/delay.h>
 
 #include "mali_kbase_rk.h"
 
@@ -48,6 +50,10 @@ static int rk_pm_enable_clk(struct kbase_device *kbdev);
 
 static void rk_pm_disable_clk(struct kbase_device *kbdev);
 
+static int kbase_platform_rk_create_sysfs_files(struct device *dev);
+
+static void kbase_platform_rk_remove_sysfs_files(struct device *dev);
+
 /*---------------------------------------------------------------------------*/
 
 static void rk_pm_power_off_delay_work(struct work_struct *work)
@@ -74,6 +80,7 @@ static void rk_pm_power_off_delay_work(struct work_struct *work)
 
 static int kbase_platform_rk_init(struct kbase_device *kbdev)
 {
+	int ret = 0;
 	struct rk_context *platform;
 
 	platform = kzalloc(sizeof(*platform), GFP_KERNEL);
@@ -96,11 +103,19 @@ static int kbase_platform_rk_init(struct kbase_device *kbdev)
 		return -ENOMEM;
 	}
 	INIT_DEFERRABLE_WORK(&platform->work, rk_pm_power_off_delay_work);
+	platform->utilisation_period = DEFAULT_UTILISATION_PERIOD_IN_MS;
+
+	ret = kbase_platform_rk_create_sysfs_files(kbdev->dev);
+	if (ret) {
+		E("fail to create sysfs_files. ret = %d.", ret);
+		goto EXIT;
+	}
 
 	kbdev->platform_context = (void *)platform;
 	pm_runtime_enable(kbdev->dev);
 
-	return 0;
+EXIT:
+	return ret;
 }
 
 static void kbase_platform_rk_term(struct kbase_device *kbdev)
@@ -117,6 +132,7 @@ static void kbase_platform_rk_term(struct kbase_device *kbdev)
 		platform->kbdev = NULL;
 		kfree(platform);
 	}
+	kbase_platform_rk_remove_sysfs_files(kbdev->dev);
 }
 
 struct kbase_platform_funcs_conf platform_funcs = {
@@ -139,8 +155,7 @@ static int rk_pm_callback_power_on(struct kbase_device *kbdev)
 {
 	int ret = 1; /* Assume GPU has been powered off */
 	int err = 0;
-	struct rk_context *platform =
-		(struct rk_context *)kbdev->platform_context;
+	struct rk_context *platform = get_rk_context(kbdev);
 
 	cancel_delayed_work_sync(&platform->work);
 
@@ -186,8 +201,7 @@ static int rk_pm_callback_power_on(struct kbase_device *kbdev)
 
 static void rk_pm_callback_power_off(struct kbase_device *kbdev)
 {
-	struct rk_context *platform =
-		(struct rk_context *)kbdev->platform_context;
+	struct rk_context *platform = get_rk_context(kbdev);
 
 	rk_pm_disable_clk(kbdev);
 	queue_delayed_work(platform->power_off_wq, &platform->work,
@@ -292,3 +306,97 @@ static void rk_pm_disable_clk(struct kbase_device *kbdev)
 	}
 }
 
+/*---------------------------------------------------------------------------*/
+
+static ssize_t utilisation_period_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	struct kbase_device *kbdev = dev_get_drvdata(dev);
+	struct rk_context *platform = get_rk_context(kbdev);
+	ssize_t ret = 0;
+
+	ret += snprintf(buf, PAGE_SIZE, "%u\n", platform->utilisation_period);
+
+	return ret;
+}
+
+static ssize_t utilisation_period_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf,
+					size_t count)
+{
+	struct kbase_device *kbdev = dev_get_drvdata(dev);
+	struct rk_context *platform = get_rk_context(kbdev);
+	int ret = 0;
+
+	ret = kstrtouint(buf, 0, &platform->utilisation_period);
+	if (ret) {
+		E("invalid input period : %s.", buf);
+		return ret;
+	}
+	D("set utilisation_period to '%d'.", platform->utilisation_period);
+
+	return count;
+}
+
+static ssize_t utilisation_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	struct kbase_device *kbdev = dev_get_drvdata(dev);
+	struct rk_context *platform = get_rk_context(kbdev);
+	ssize_t ret = 0;
+	unsigned long period_in_us = platform->utilisation_period * 1000;
+	unsigned long total_time;
+	unsigned long busy_time;
+	unsigned long utilisation;
+
+	kbase_pm_reset_dvfs_utilisation(kbdev);
+	usleep_range(period_in_us, period_in_us + 100);
+	kbase_pm_get_dvfs_utilisation(kbdev, &total_time, &busy_time);
+	/* 'devfreq_dev_profile' instance registered to devfreq
+	 * also uses kbase_pm_reset_dvfs_utilisation
+	 * and kbase_pm_get_dvfs_utilisation.
+	 * it's better to cat this file when DVFS is disabled.
+	 */
+	D("total_time : %lu, busy_time : %lu.", total_time, busy_time);
+
+	utilisation = busy_time * 100 / total_time;
+	ret += snprintf(buf, PAGE_SIZE, "%ld\n", utilisation);
+
+	return ret;
+}
+
+static DEVICE_ATTR_RW(utilisation_period);
+static DEVICE_ATTR_RO(utilisation);
+
+static int kbase_platform_rk_create_sysfs_files(struct device *dev)
+{
+	int ret = 0;
+
+	ret = device_create_file(dev, &dev_attr_utilisation_period);
+	if (ret) {
+		E("fail to create sysfs file 'utilisation_period'.");
+		goto out;
+	}
+
+	ret = device_create_file(dev, &dev_attr_utilisation);
+	if (ret) {
+		E("fail to create sysfs file 'utilisation'.");
+		goto remove_utilisation_period;
+	}
+
+	return 0;
+
+remove_utilisation_period:
+	device_remove_file(dev, &dev_attr_utilisation_period);
+out:
+	return ret;
+}
+
+static void kbase_platform_rk_remove_sysfs_files(struct device *dev)
+{
+	device_remove_file(dev, &dev_attr_utilisation_period);
+	device_remove_file(dev, &dev_attr_utilisation);
+}
diff --git a/drivers/gpu/arm/midgard/platform/rk/mali_kbase_rk.h b/drivers/gpu/arm/midgard/platform/rk/mali_kbase_rk.h
index d6db811d1fce..e1623806abe8 100644
--- a/drivers/gpu/arm/midgard/platform/rk/mali_kbase_rk.h
+++ b/drivers/gpu/arm/midgard/platform/rk/mali_kbase_rk.h
@@ -17,18 +17,34 @@
 
 /*---------------------------------------------------------------------------*/
 
-/**
+#define DEFAULT_UTILISATION_PERIOD_IN_MS (100)
+
+/*---------------------------------------------------------------------------*/
+
+/*
  * struct rk_context - work_context of platform_dependent_part_of_rk.
- * @is_powered: record the status
- *      of common_parts calling 'power_on_callback' and 'power_off_callback'.
  */
 struct rk_context {
+	/*
+	 * record the status of common_parts calling 'power_on_callback'
+	 * and 'power_off_callback'.
+	 */
 	bool is_powered;
 	struct kbase_device *kbdev;
 	struct workqueue_struct *power_off_wq;
 	struct delayed_work work;
 	unsigned int delay_ms;
+	/* debug only, the period in ms to count gpu_utilisation. */
+	unsigned int utilisation_period;
 };
 
+/*---------------------------------------------------------------------------*/
+
+static inline struct rk_context *get_rk_context(
+		const struct kbase_device *kbdev)
+{
+	return (struct rk_context *)(kbdev->platform_context);
+}
+
 #endif				/* _MALI_KBASE_RK_H_ */