如何使用高通Perflock

本文介绍高通PerfLock的使用。

PerfLock 架构

PerfLock 架构

Perflock的API封装在libqti-perfd-client.so库里面(源码在android/vendor/qcom/proprietary/commonsys-intf/android-perf/mp-ctl/client.cpp),主要包含三个方法:

  • int perf_lock_acq(int handle, int duration, int list[], int numArgs)
  • int perf_lock_rel(int handle)
  • int perf_hint(int hint, const char *pkg, int duration, int type)

Perflock的使用

可以通过perf_lock_acq和perf_lock_rel来提频操作。

handle参数

调用perf_lock_acq或perf_hint会返回一个handle,该Handle可以存起来后面继续使用。

第一次调用perf_lock_acq或perf_hint方法时,handle为0,perflock会创建一个新的handle

示例:

mHandle = (m_pPerfLockOps->perfLockAcquire(mHandle,
                                           timer,
                                           m_pPerflockInfo->perfLockParams,
                                           m_pPerflockInfo->perfLockParamsCount));

duration

表示要让Perf engine LOCK住多久,单位是ms。

如果设置为0,则表示无限时间。

list[] 和 numArgs

list[]是要传递给Perf Engine的参数,每2个参数为一组[resource, value],numArgs为参数个数。

list[] 和 numArgs示例:

{ // PERF_LOCK_OPEN_CAMERA
    perfLockParamsOpenCamera,
    sizeof(perfLockParamsOpenCamera) / sizeof(INT32)
},

perfLockParamsOpenCamera定义为:

static INT32 perfLockParamsOpenCamera[] =
{
    // Disable power collapse and set CPU clocks to turbo
    MPCTLV3_ALL_CPUS_PWR_CLPS_DIS,          0x1,
    MPCTLV3_SCHED_BOOST,                    0x1,
    MPCTLV3_MAX_FREQ_CLUSTER_BIG_CORE_0,    0xFFF,
    MPCTLV3_MIN_FREQ_CLUSTER_BIG_CORE_0,    0xFFF,
    MPCTLV3_MAX_FREQ_CLUSTER_LITTLE_CORE_0, 0xFFF,
    MPCTLV3_MIN_FREQ_CLUSTER_LITTLE_CORE_0, 0xFFF,
    MPCTLV3_MIN_FREQ_CLUSTER_PLUS_CORE_0,   0xFFF,
    MPCTLV3_MAX_FREQ_CLUSTER_PLUS_CORE_0,   0xFFF
};

可以看出来Open Camera时是

  • 关闭power collapse
  • 使能SCHED_BOOST
  • 大核、小核、超大核都切成turbo模式

perf_lock_rel

释放持有的perfLock,具体是哪个perflock由参数handle决定。

如果perf_lock_acq有设置duration,则不需要调用perf_lock_rel。

示例

在一个Native进程中使用PerfLock来调出两个核。

Makefile

LOCAL_SHARED_LIBRARIES := liblog libcutils libdl libqti-perfd-client
LOCAL_C_INCLUDES := device/qcom/common/power

源代码

#include <dlfcn.h>
#include “performance.h”
static void *qcopt_handle;
static int (*perf_lock_acq)(int handle, int duration, int list[], int numArgs);
static int (*perf_lock_rel)(int handle);
static int perf_lock_handle;
char opt_lib_path[PATH_MAX] = {0};
if (property_get("ro.vendor.extension_library", opt_lib_path, NULL) != 0) {
    if((qcopt_handle = dlopen(opt_lib_path, RTLD_NOW)) == NULL) {
        error_out();
    } else {
        perf_lock_acq = (int(*)(int, int, int*,int))dlsym(qcopt_handle, "perf_lock_acq");
        perf_lock_rel = (int(*)(int))dlsym(qcopt_handle, "perf_lock_rel");
    }
}
int perf_lock_opts[1] = {CPUS_ONLINE_MIN_2};
perf_lock_handle = perf_lock_acq(perf_lock_handle, 0, perf_lock_opts, 1);
// Critical section requiring PerfLock
perf_lock_rel(perf_lock_handle);

具体可参考代码:vendor/qcom/proprietary/android-perf/tests/ModuleTests/mp-ctl/perflock_native_test.cpp

PowerHint的使用

使用PowerHint需要先在powerhint.xml里面定义一个HintID,然后再调用perf_hint让其生效。

PowerHint XML位置: vendor/qcom/opensource/power/config/bengal/powerhint.xml,系统中,该文件存放在/vendor/etc/powerhint.xml"

其他XML文件位置定义如下:

#define PERF_MAPPING_XML "/vendor/etc/perf/perfmapping.xml"
#define PERF_BOOSTS_CONFIGS_XML "/vendor/etc/perf/perfboostsconfig.xml"
#define POWER_CONFIGS_XML "/vendor/etc/powerhint.xml"
#define COMMONRESOURCE_CONFIGS_XML "/vendor/etc/perf/commonresourceconfigs.xml"
#define TARGETRESOURCE_CONFIGS_XML "/vendor/etc/perf/targetresourceconfigs.xml"

语法:

int perf_hint(int hint, const char *pkg, int duration, int type)

参数:

  • hint- 识别每个Hit的ID。
  • Pkg- 谁触发这个Hint。
  • Duration- Duration of the hint perflock.
  • Type- To differentiate between similar action, like horizontal scroll/vertical scroll,一般可以传-1。

常用Resource ID

Resource ID Resource Name Description Description
0x40400000 MPCTLV3_TOGGLE_POWER_COLLAPSE 是否允许CPU进入深度低功耗模式 /dev/cpu_dma_latency,默认空,不允许则设置为1
0x40C00000 MPCTLV3_SCHED_BOOST
1 (Fullthrottle), 2(Conservative),3(Restrained)
SCHED加速类型 /proc/sys/kernel/sched_boost
0x40800100 MPCTLV3_MIN_FREQ_CLUSTERLITTLE CORE_0 设置小核最小频率,十六进制 /sys/module/msm_performance/p arameters/cpu_min_freq
0x40804100 MPCTLV3_MAX_FREQ_CLUSTERLITTLE CORE_0 设置小核最大频率,十六进制 /sys/module/msm_performance/p arameters/cpu_max_freq
0x40800000 MPCTLV3_MIN_FREQ_CLUSTER_BIG_CO RE_0 设置大核最小频率,十六进制 /sys/module/msm_performance/p arameters/cpu_min_freq
0x40804000 MPCTLV3_MAX_FREQ_CLUSTER_BIG_CO RE_0 设置大核最大频率,十六进制 /sys/module/msm_performance/p arameters/cpu_max_freq
0X42804000 MPCTLV3_GPU_MIN_POWER_LEVEL 设置GPU最小PowerLevel,十六进制 /sys/class/kgsl/kgsl3d0/min_pwrlevel
0X42808000 MPCTLV3_GPU_MAX_POWER_LEVEL 设置GPU最大PowerLevel,十六进制 /sys/class/kgsl/kgsl3d0/max_pwrlevel
0x41000000 MPCTLV3_MIN_ONLINE_CPUCLUSTER BIG 最小几个大核Online /sys/devices/system/cpu/cpu*/cor e_ctl/min_cpus
0x41004000 MPCTLV3_MAX_ONLINE_CPUCLUSTER BIG 最多几个大核Online /sys/devices/system/cpu/cpu*/cor e_ctl/max_cpus
0x41000100 MPCTLV3_MIN_ONLINE_CPUCLUSTER LITTLE 最小几个小核Online /sys/devices/system/cpu/cpu*/cor e_ctl/min_cpus
0x41004100 MPCTLV3_MAX_ONLINE_CPUCLUSTER LITTLE 最多几个小核Online /sys/devices/system/cpu/cpu*/cor e_ctl/max_cpus
0x41000200 MPCTLV3_MIN_ONLINE_CPUCLUSTER PRIME 最小几个超大核Online /sys/devices/system/cpu/cpu*/cor e_ctl/min_cpus
0x41800000 MPCTLV3_CPUBW_HWMON_MIN_FREQ CPU请求的最小DDR频率 /sys/class/devfreq/soc:qcom,cpub w/min_freq
0x41818000 MPCTLV3_CPUBW_HWMON_MAX_FREQ CPU请求的最大DDR频率 /sys/class/devfreq/soc:qcom,cpub w/max_freq

OpenCamera过程中,将所有CPU都拉满

static INT32 perfLockParamsOpenCamera[] =
{
    // Disable power collapse and set CPU clocks to turbo
    MPCTLV3_ALL_CPUS_PWR_CLPS_DIS,          0x1,
    MPCTLV3_SCHED_BOOST,                    0x1,
    MPCTLV3_MAX_FREQ_CLUSTER_BIG_CORE_0,    0xFFF,
    MPCTLV3_MIN_FREQ_CLUSTER_BIG_CORE_0,    0xFFF,
    MPCTLV3_MAX_FREQ_CLUSTER_LITTLE_CORE_0, 0xFFF,
    MPCTLV3_MIN_FREQ_CLUSTER_LITTLE_CORE_0, 0xFFF,
    MPCTLV3_MIN_FREQ_CLUSTER_PLUS_CORE_0,   0xFFF,
    MPCTLV3_MAX_FREQ_CLUSTER_PLUS_CORE_0,   0xFFF
};

PerfLock in Camera

CamX

CamX中有一个类:CamxPerfLockManager,封装了对perflock的使用,代码路径为:vendor/qcom/proprietary/camx/src/osutils/camxperf.cpp

CHI

CHI也有一个类:PerfLockManager,封装了对perflock的使用,代码路径为:vendor/qcom/proprietary/chi-cdk/core/chiutils/chxperf.cpp

Perflock 调试

Log

adb root 
adb remount(disable verity if needed) 
adb shell "echo vendor.debug.trace.perf=1 >> /system/build.prop" 
adb reboot

然后从Log里面能看到如下打印:

07-10 16:07:27.575 13212 13212 E ANDR-PERF-MPCTL: perf_lock_acq: client_pid=1007, client_tid=1095, inupt handle=0, duration=80 ms, 
num_args=18, list=0x43000000 0x19 0x40800000 0x3E8 0x40800100 0x3E8 0x40800200 0x3E8 0x40C00000 0x2 0x43400000 0x1F40 0x40C74000 0xFF
0x40408000 0x63 0x41000000 0x3 
07-10 16:07:27.575 13212 13212 E ANDR-PERF-MPCTL: perf_lock_acq: output handle=1
07-10 16:07:27.576 13212 13212 E ANDR-PERF-MPCTL: perf_lock_acq: client_pid=1007, client_tid=1095, inupt handle=0, duration=0 ms, num_args=18, 
list=0x43000000 0x11 0x40800000 0x3E8 0x40800100 0x3E8 0x40800200 0x3E8 0x40C00000 0x2 0x43400000 0x1F40 0x40C74000 0xFF 0x40408000 0x63 
0x41000000 0x3 
07-10 16:07:27.576 13212 13212 E ANDR-PERF-MPCTL: perf_lock_acq: output handle=2
07-10 16:07:27.649 13212 13213 E ANDR-PERF-MPCTL: perf_lock_rel: input handle=2
07-10 16:07:27.660 13212 13213 E ANDR-PERF-MPCTL: perf_lock_rel: input handle=1

如果需要更多Log,可以打开QC_DEBUG:

vendor/qcom/proprietary/android-perf/mp-ctl/, 在makefile中打开 QC_DEBUG flag

Dump

可以执行

dumpsys vendor.perfservice

来dump 处于active状态的 request list。

实验验证CPU/GPU/DDR最高频

关闭perflock和thermal

adb shell su -c setenforce 0
adb shell stop thermal-engine
adb shell stop perf-hal-1-0
adb shell stop perfd

perf-hal的版本要注意不一定是1.0,具体的perf hal版本可以参考:vendor/qcom/proprietary/android-perf/perf-hal/xxxx.rc

关闭 low power model

adb shell "echo Y > /sys/module/lpm_levels/parameters/sleep_disabled“

online 所有 cpus

adb shell "echo 4 > /sys/devices/system/cpu/cpu0/core_ctl/min_cpus“
adb shell "echo 4 > /sys/devices/system/cpu/cpu0/core_ctl/max_cpus“
adb shell "echo 4 > /sys/devices/system/cpu/cpu4/core_ctl/min_cpus"
adb shell "echo 4 > /sys/devices/system/cpu/cpu4/core_ctl/max_cpus"
adb shell "echo 1 > /sys/devices/system/cpu/cpu0/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu1/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu2/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu3/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu4/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu5/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu6/online"
adb shell "echo 1 > /sys/devices/system/cpu/cpu7/online"

cpufreq performance

adb shell "echo performance > /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor"

adb shell "echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu6/cpufreq/scaling_governor"
adb shell "echo performance > /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor"

gpu performance

adb shell stop mpdecision
adb shell "echo 0 > /sys/class/kgsl/kgsl-3d0/min_pwrlevel"
adb shell "echo 0 > /sys/class/kgsl/kgsl-3d0/max_pwrlevel"
adb shell "echo 1 > /sys/class/kgsl/kgsl-3d0/force_rail_on"
adb shell "echo 1 > /sys/class/kgsl/kgsl-3d0/force_clk_on"
adb shell "echo 1 > /sys/class/kgsl/kgsl-3d0/force_bus_on"
adb shell "echo 10000000 > /sys/class/kgsl/kgsl-3d0/idle_timer"
adb shell "echo performance > /sys/class/kgsl/kgsl-3d0/devfreq/governor"

ddr performance

adb shell "echo performance >/sys/class/devfreq/*/governor”

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