Mali: Add devfreq supporttracking-samslt-all-ll-20121217.0tracking-samslt-all-ll-20121213.0samsung-lt-v3.7

This patch adds devfreq support for Mali driver. Though mali driver
has its own mechanism for load monitoring, this patch makes use of
devfreq framework to achieve same functionality. The goal is to
export gpu dvfs information to user space.

Depends on devfreq patchset - https://lkml.org/lkml/2012/10/4/95

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>

7 files changed, 279 insertions, 1 deletions

diff --git a/drivers/gpu/arm/mali/Kconfig b/drivers/gpu/arm/mali/Kconfig
index 1404f59d3de4..41110eb7270f 100644
--- a/drivers/gpu/arm/mali/Kconfig
+++ b/drivers/gpu/arm/mali/Kconfig
@@ -39,6 +39,13 @@ config USING_GPU_UTILIZATION
         ---help---
                 This enables GPU utilization information.
 
+config USING_GPU_DEVFREQ
+	bool "GPU devfreq"
+        depends on MALI400MP && USING_GPU_UTILIZATION
+        default n
+        ---help---
+                This enables GPU devfreq.
+
 config USING_MALI_RUN_TIME_PM
         bool "Using Run time Power Management"
         depends on MALI400MP
diff --git a/drivers/gpu/arm/mali/Makefile b/drivers/gpu/arm/mali/Makefile
index 263e076a4a9a..0e3d29d9b046 100755
--- a/drivers/gpu/arm/mali/Makefile
+++ b/drivers/gpu/arm/mali/Makefile
@@ -47,6 +47,10 @@ ifeq ($(CONFIG_USING_GPU_UTILIZATION),y)
 USING_GPU_UTILIZATION =1
 endif
 
+ifeq ($(CONFIG_USING_GPU_DEVFREQ),y)
+USING_GPU_DEVFREQ =1
+endif
+
 ifeq ($(CONFIG_USING_MALI_RUN_TIME_PM),y)
 USING_MALI_RUN_TIME_PM =1
 endif
@@ -66,6 +70,7 @@ USING_UMP ?= 0
 USING_OS_MEMORY ?= 0
 USING_PMM ?= 0
 USING_GPU_UTILIZATION ?= 0
+USING_GPU_DEVFREQ ?= 0
 USING_MALI_RUN_TIME_PM ?= 0
 USING_MALI_PMM_TESTSUITE ?= 0
 OS_MEMORY_KERNEL_BUFFER_SIZE_IN_MB ?= 6
@@ -109,6 +114,7 @@ endif
 
 DEFINES += -DUSING_MALI_PMM=$(USING_PMM)
 DEFINES += -DMALI_GPU_UTILIZATION=$(USING_GPU_UTILIZATION)
+DEFINES += -DMALI_GPU_DEVFREQ=$(USING_GPU_DEVFREQ)
 
 ifeq ($(CONFIG_DEBUG_BUILD),y)
 DEFINES += -DDEBUG
@@ -213,9 +219,14 @@ mali-y += \
 endif
 
 ifeq ($(USING_GPU_UTILIZATION),1)
+ifeq ($(USING_GPU_DEVFREQ),1)
+mali-y += \
+	linux/mali_kernel_devfreq.o
+else
 mali-y += \
 	common/mali_kernel_utilization.o
 endif
+endif
 
 ifneq ($(call submodule_enabled, $M, MALI400PP),0)
 	# Mali-400 PP in use
diff --git a/drivers/gpu/arm/mali/linux/mali_kernel_devfreq.c b/drivers/gpu/arm/mali/linux/mali_kernel_devfreq.c
new file mode 100644
index 000000000000..1213e7bc6946
--- /dev/null
+++ b/drivers/gpu/arm/mali/linux/mali_kernel_devfreq.c
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2010-2011 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
+ *
+ * A copy of the licence is included with the program, and can also be obtained from Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/devfreq.h>
+#include <linux/platform_device.h>
+#include "mali_kernel_devfreq.h"
+#include "mali_osk.h"
+#include "mali_platform.h"
+#include "mali_linux_pm.h"
+
+#define MALI_GPU_UTILIZATION_PERIOD	500
+
+static _mali_osk_lock_t *time_data_lock;
+
+static _mali_osk_atomic_t num_running_cores;
+
+static u64 period_start_time = 0;
+static u64 work_start_time = 0;
+static u64 accumulated_work_time = 0;
+static mali_bool timer_running = MALI_FALSE;
+
+static struct devfreq *mali_devfreq;
+
+static int mali_get_dev_status(struct device *dev,
+				struct devfreq_dev_status *stat)
+{
+	u64 time_now;
+	u64 time_period;
+
+	_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+
+	if (accumulated_work_time == 0 && work_start_time == 0)
+	{
+		/* No work done for this period, report zero usage */
+		stat->total_time = 0;
+		stat->busy_time = 0;
+		stat->current_frequency = get_mali_platform_cur_freq();
+
+		_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+
+		return 0;
+	}
+
+	time_now = _mali_osk_time_get_ns();
+	time_period = time_now - period_start_time;
+
+	/* If we are currently busy, update working period up to now */
+	if (work_start_time != 0)
+	{
+		accumulated_work_time += (time_now - work_start_time);
+		work_start_time = time_now;
+	}
+
+	stat->total_time = time_period;
+	stat->busy_time = accumulated_work_time;
+	stat->current_frequency = get_mali_platform_cur_freq();
+
+	accumulated_work_time = 0;
+	/* start a new period */
+	period_start_time = time_now;
+	_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+
+	return 0;
+}
+
+static int mali_set_target_freq(struct device *dev,
+				unsigned long *freq,
+				u32 flags)
+{
+	mali_gpu_utilization_handler(*freq);
+	return 0;
+}
+
+static int mali_get_cur_freq(struct device *dev, unsigned long *freq)
+{
+	*freq = get_mali_platform_cur_freq();
+	return 0;
+}
+
+static struct devfreq_dev_profile mali_devfreq_profile = {
+	.polling_ms = MALI_GPU_UTILIZATION_PERIOD,
+	.initial_freq = 0,
+	.target = mali_set_target_freq,
+	.get_dev_status = mali_get_dev_status,
+	.get_cur_freq = mali_get_cur_freq,
+};
+
+_mali_osk_errcode_t mali_utilization_init(void)
+{
+	/* Register mali devfreq with ondemand governor */
+	mali_devfreq = devfreq_add_device(&mali_gpu_device.dev,
+					&mali_devfreq_profile,
+					&devfreq_simple_ondemand,
+					NULL);
+	if (NULL == mali_devfreq)
+	{
+		return _MALI_OSK_ERR_FAULT;
+	}
+
+	time_data_lock = _mali_osk_lock_init( 0, 0, 0 );
+	if (NULL == time_data_lock)
+	{
+		return _MALI_OSK_ERR_FAULT;
+	}
+
+	_mali_osk_atomic_init(&num_running_cores, 0);
+
+	return _MALI_OSK_ERR_OK;
+}
+
+void mali_utilization_suspend(void)
+{
+	if (timer_running == MALI_TRUE)
+	{
+		devfreq_suspend_device(mali_devfreq);
+		_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+		timer_running = MALI_FALSE;
+		work_start_time = 0;
+		period_start_time = 0;
+		accumulated_work_time = 0;
+		_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+	}
+}
+
+void mali_utilization_resume(void)
+{
+	devfreq_resume_device(mali_devfreq);
+}
+
+void mali_utilization_term(void)
+{
+	devfreq_remove_device(mali_devfreq);
+	mali_devfreq = NULL;
+
+	timer_running = MALI_FALSE;
+
+	_mali_osk_atomic_term(&num_running_cores);
+
+	_mali_osk_lock_term(time_data_lock);
+}
+
+void mali_utilization_core_start(void)
+{
+	if (_mali_osk_atomic_inc_return(&num_running_cores) == 1)
+	{
+		/*
+		 * We went from zero cores working, to one core working,
+		 * we now consider the entire GPU for being busy
+		 */
+		_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+
+		work_start_time = _mali_osk_time_get_ns();
+
+		if (timer_running != MALI_TRUE)
+		{
+			timer_running = MALI_TRUE;
+			period_start_time = work_start_time;
+		}
+
+		_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+	}
+}
+
+void mali_utilization_core_end(void)
+{
+	if (_mali_osk_atomic_dec_return(&num_running_cores) == 0)
+	{
+		/*
+		 * No more cores are working, so accumulate the time we was busy.
+		 */
+		u64 time_now;
+
+		_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+
+		time_now = _mali_osk_time_get_ns();
+		accumulated_work_time += (time_now - work_start_time);
+		work_start_time = 0;
+
+		_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
+	}
+}
diff --git a/drivers/gpu/arm/mali/linux/mali_kernel_devfreq.h b/drivers/gpu/arm/mali/linux/mali_kernel_devfreq.h
new file mode 100644
index 000000000000..e0a76dcbb351
--- /dev/null
+++ b/drivers/gpu/arm/mali/linux/mali_kernel_devfreq.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2010-2011 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
+ *
+ * A copy of the licence is included with the program, and can also be obtained from Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __MALI_KERNEL_DEVFREQ_H__
+#define __MALI_KERNEL_DEVFREQ_H__
+
+#include "mali_osk.h"
+
+/**
+ * Initialize/start the Mali GPU utilization metrics reporting.
+ *
+ * @return _MALI_OSK_ERR_OK on success, otherwise failure.
+ */
+_mali_osk_errcode_t mali_utilization_init(void);
+
+/**
+ * Terminate the Mali GPU utilization metrics reporting
+ */
+void mali_utilization_term(void);
+
+/**
+ * Should be called when a job is about to execute a job
+ */
+void mali_utilization_core_start(void);
+
+/**
+ * Should be called to suspend the utilization monitoring during
+ * system suspend or device pm-runtime suspend
+ */
+void mali_utilization_suspend(void);
+
+/**
+ * Should be called to resume the utilization monitoring during
+ * system resume or device pm-runtime resume
+ */
+void mali_utilization_resume(void);
+
+/**
+ * Should be called when a job has completed executing a job
+ */
+void mali_utilization_core_end(void);
+
+
+#endif /* __MALI_KERNEL_DEVFREQ_H__ */
diff --git a/drivers/gpu/arm/mali/linux/mali_kernel_pm.c b/drivers/gpu/arm/mali/linux/mali_kernel_pm.c
index ea92368ccae7..99ce009c03ce 100644
--- a/drivers/gpu/arm/mali/linux/mali_kernel_pm.c
+++ b/drivers/gpu/arm/mali/linux/mali_kernel_pm.c
@@ -41,6 +41,10 @@
 #include "mali_kernel_utilization.h"
 #endif /* MALI_GPU_UTILIZATION */
 
+#if MALI_GPU_DEVFREQ
+#include "mali_kernel_devfreq.h"
+#endif /* MALI_GPU_DEVFREQ */
+
 #if MALI_POWER_MGMT_TEST_SUITE
 #ifdef CONFIG_PM
 #include "mali_linux_pm_testsuite.h"
@@ -419,6 +423,9 @@ static int mali_pm_os_resume_on_hibernation(struct device *dev)
  */
 static int mali_device_runtime_suspend(struct device *dev)
 {
+#if MALI_GPU_DEVFREQ
+	mali_utilization_suspend();
+#endif /* MALI_GPU_DEVFREQ */
 	MALI_DEBUG_PRINT(4, ("PMMDEBUG: Mali device Run time suspended \n" ));
 	return 0;
 }
@@ -427,6 +434,9 @@ static int mali_device_runtime_suspend(struct device *dev)
  */
 static int mali_device_runtime_resume(struct device *dev)
 {
+#if MALI_GPU_DEVFREQ
+	mali_utilization_resume();
+#endif /* MALI_GPU_DEVFREQ */
 	MALI_DEBUG_PRINT(4, ("PMMDEBUG: Mali device Run time Resumed \n" ));
 	return 0;
 }
diff --git a/drivers/gpu/arm/mali/platform/default/mali_platform.c b/drivers/gpu/arm/mali/platform/default/mali_platform.c
index d966f25f6c44..824785620ac6 100644
--- a/drivers/gpu/arm/mali/platform/default/mali_platform.c
+++ b/drivers/gpu/arm/mali/platform/default/mali_platform.c
@@ -40,4 +40,7 @@ void set_mali_parent_power_domain(void* dev)
 {
 }
 
-
+unsigned long get_mali_platform_cur_freq(void)
+{
+    return 0;
+}
diff --git a/drivers/gpu/arm/mali/platform/mali_platform.h b/drivers/gpu/arm/mali/platform/mali_platform.h
index 078bcefa11b1..f1bb2b5c7ad4 100644
--- a/drivers/gpu/arm/mali/platform/mali_platform.h
+++ b/drivers/gpu/arm/mali/platform/mali_platform.h
@@ -93,6 +93,14 @@ void mali_gpu_utilization_handler(u32 utilization);
  */
 void set_mali_parent_power_domain(void* dev);
 
+/** @brief Get MALI current running frequency
+ *
+ * This function gets the current running frequency of MALI
+ *
+ * @return frequency in Hz
+ */
+unsigned long get_mali_platform_cur_freq(void);
+
 #ifdef __cplusplus
 }
 #endif