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
Patch is based on git://git.linaro.org/people/chunsangjeong/mali-dev.git tree.
Signed-off-by: Rajagopal Venkat rajagopal.venkat@linaro.org --- drivers/gpu/arm/mali/Kconfig | 7 + drivers/gpu/arm/mali/Makefile | 11 ++ drivers/gpu/arm/mali/linux/mali_kernel_devfreq.c | 188 +++++++++++++++++++++ drivers/gpu/arm/mali/linux/mali_kernel_devfreq.h | 51 ++++++ drivers/gpu/arm/mali/linux/mali_kernel_pm.c | 10 ++ .../gpu/arm/mali/platform/default/mali_platform.c | 5 +- drivers/gpu/arm/mali/platform/mali_platform.h | 8 + 7 files changed, 279 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/arm/mali/linux/mali_kernel_devfreq.c create mode 100644 drivers/gpu/arm/mali/linux/mali_kernel_devfreq.h
diff --git a/drivers/gpu/arm/mali/Kconfig b/drivers/gpu/arm/mali/Kconfig index 416c231..41634f9 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 525a23e..6c854b1 100755 --- a/drivers/gpu/arm/mali/Makefile +++ b/drivers/gpu/arm/mali/Makefile @@ -45,6 +45,10 @@ ifeq ($(CONFIG_USING_GPU_UTILIZATION),y) USING_GPU_UTILIZATION =1 endif
+ifeq ($(CONFIG_USING_GPU_DEVFREQ),y) +USING_GPU_DEVFREQ =1 +endif + ifeq ($(CONFIG_USING_MALI_RUN_TIME_PM),y) USING_MALI_RUN_TIME_PM =1 endif @@ -64,6 +68,7 @@ USING_UMP ?= 0 USING_OS_MEMORY ?= 0 USING_PMM ?= 0 USING_GPU_UTILIZATION ?= 0 +USING_GPU_DEVFREQ ?= 0 USING_MALI_RUN_TIME_PM ?= 0 USING_MALI_PMM_TESTSUITE ?= 0 OS_MEMORY_KERNEL_BUFFER_SIZE_IN_MB ?= 6 @@ -105,6 +110,7 @@ endif
DEFINES += -DUSING_MALI_PMM=$(USING_PMM) DEFINES += -DMALI_GPU_UTILIZATION=$(USING_GPU_UTILIZATION) +DEFINES += -DMALI_GPU_DEVFREQ=$(USING_GPU_DEVFREQ)
ifeq ($(CONFIG_DEBUG_BUILD),y) DEFINES += -DDEBUG @@ -201,9 +207,14 @@ mali-y += \ endif
ifeq ($(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 0000000..1213e7b --- /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 0000000..e0a76dc --- /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 0c03678..958164e 100644 --- a/drivers/gpu/arm/mali/linux/mali_kernel_pm.c +++ b/drivers/gpu/arm/mali/linux/mali_kernel_pm.c @@ -40,6 +40,10 @@ #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" @@ -418,6 +422,9 @@ 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; } @@ -426,6 +433,9 @@ 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 d966f25..8247856 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 078bcef..f1bb2b5 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