下载valgrind源码 两种方式（任选其一） 1）登录http://valgrind.org/downloads/ 下载压缩包 2）git clone git://sourceware.org/git/valgrind.git 基于hisi toolchain，交叉编译valgrind 编译主机 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux PC上编译命令 export LD=aarch64-himix100-linux-ld export AR=aarch64-himix100-linux-ar export CC=aarch64-himix100-linux-gcc ./configure --host=aarch64-himix100-linux --prefix=/home/huangxing/valgrind_install/ make -j4 make install 编译完成后，在valgrind_install中安装了以下文件。 simh@hxdl:~/valgrind_install$ tree -L 2 . ├── bin │   ├── callgrind_annotate │   ├── callgrind_control │   ├── cg_annotate │   ├── cg_diff │   ├── cg_merge │   ├── ms_print │   ├── valgrind │   ├── valgrind-di-server │   ├── valgrind-listener │   └── vgdb ├── include │   └── valgrind └── lib ├──-- pkgconfig └──-- valgrind 将valgrind_install目录拷贝到nfs方式挂载的路径下。 海思板端执行： export VALGRIND_LIB='/home/simh/valgrind_install/lib/valgrind' 如果不执行上面的命令，会提示找不到memcheck！ cd /home/simh/valgrind_install/bin ./valgrind --help 此时会提示以下错误： /home/simh/valgrind_install/bin # ./valgrind ls -l ==19263== Memcheck, a memory error detector ==19263== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==19263== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info ==19263== Command: ls -l ==19263== valgrind: Fatal error at startup: a function redirection valgrind: which is mandatory for this platform-tool combination valgrind: cannot be set up. Details of the redirection are: valgrind: valgrind: A must-be-redirected function valgrind: whose name matches the pattern: strlen valgrind: in an object with soname matching: ld-linux-aarch64.so.1 valgrind: was not found whilst processing valgrind: symbols from the object with soname: ld-linux-aarch64.so.1 valgrind: valgrind: Possible fixes: (1, short term): install glibc's debuginfo valgrind: package on this machine. (2, longer term): ask the packagers valgrind: for your Linux distribution to please in future ship a non- valgrind: stripped ld.so (or whatever the dynamic linker .so is called) valgrind: that exports the above-named function using the standard valgrind: calling conventions for this platform. The package you need valgrind: to install for fix (1) is called valgrind: valgrind: On Debian, Ubuntu: libc6-dbg valgrind: On SuSE, openSuSE, Fedora, RHEL: glibc-debuginfo valgrind: valgrind: Note that if you are debugging a 32 bit process on a valgrind: 64 bit system, you will need a corresponding 32 bit debuginfo valgrind: package (e.g. libc6-dbg:i386). valgrind: valgrind: Cannot continue -- exiting now. Sorry. 此时的处理方法也比较简单，可以任选其一。 1） 更改osdrv的makefile，将hirootfs_prepare中的这句话注释掉。 pushd $(OSDRV_DIR)/pub/$(PUB_ROOTFS); $(OSDRV_CROSS)-strip ./lib/*; popd 2）直接到/opt/hisi-linux/x86-arm/aarch64-himix100-linux/target/lib中取libc-2.24.so（not stripped）, 重新制作rootfs。 至此，algrind应该可以在海思平台上运行了， cd /home/simh/valgrind_install/bin ./valgrind ls -l /home/simh/valgrind_install/bin # ./valgrind ls -l ==7215== Memcheck, a memory error detector ==7215== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==7215== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info ==7215== Command: ls -l ==7215== total 2608 -rw------- 1 root root 150158 Oct 24 10:50 callgrind.out.2646 -rw------- 1 root root 476590 Oct 24 10:51 callgrind.out.2661 -rw------- 1 root root 150110 Oct 24 10:51 callgrind.out.2689 -rw------- 1 root root 508277 Oct 24 10:52 callgrind.out.2694 -rw------- 1 root root 509620 Oct 24 10:53 callgrind.out.2735 -rw------- 1 root root 93369 Oct 24 10:52 callgrind.out.2737 -rwxr-xr-x 1 1000 1000 42184 Oct 23 17:38 callgrind_annotate -rwxr-xr-x 1 1000 1000 12677 Oct 23 17:38 callgrind_control -rwxr-xr-x 1 1000 1000 32174 Oct 23 17:38 cg_annotate -rwxr-xr-x 1 1000 1000 10422 Oct 23 17:38 cg_diff -rwxr-xr-x 1 1000 1000 238632 Oct 23 17:38 cg_merge -rwxr-xr-x 1 1000 1000 24402 Oct 23 17:38 ms_print -rwxr-xr-x 1 1000 1000 76888 Oct 23 17:38 valgrind -rwxr-xr-x 1 1000 1000 104024 Oct 23 17:38 valgrind-di-server -rwxr-xr-x 1 1000 1000 39072 Oct 23 17:38 valgrind-listener -rwxr-xr-x 1 1000 1000 168088 Oct 23 17:38 vgdb ==7215== ==7215== HEAP SUMMARY: ==7215== in use at exit: 775 bytes in 8 blocks ==7215== total heap usage: 98 allocs, 90 frees, 66,501 bytes allocated ==7215== ==7215== LEAK SUMMARY: ==7215== definitely lost: 32 bytes in 2 blocks ==7215== indirectly lost: 112 bytes in 1 blocks ==7215== possibly lost: 0 bytes in 0 blocks ==7215== still reachable: 631 bytes in 5 blocks ==7215== suppressed: 0 bytes in 0 blocks ==7215== Rerun with --leak-check=full to see details of leaked memory ==7215== ==7215== For counts of detected and suppressed errors, rerun with: -v ==7215== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) valgrind正常运行了。 数据分析 valgrind在板端运行生成的数据可以通过pc端的工具进行分析。 举例来说： 如果使用callgrind工具，会生成callgrind.out.pid文件，可以通过kcachegrind工具分析，或者通过gprof2dot.py工具进行分析。 gprof2dot.py可以在以下链接下载： https://github.com/jrfonseca/gprof2dot 使用示例： gprof2dot.py -f callgrind ./callgrind.out.2735 | dot -Tpng -o ps_report.png 不过valgrind官网推荐使用kcachegrind工具。 Callgrind Callgrind, by Josef Weidendorfer, is an extension to Cachegrind. It provides all the information that Cachegrind does, plus extra information about callgraphs. It was folded into the main Valgrind distribution in version 3.2.0. Available separately is an amazing visualisation tool, KCachegrind, which gives a much better overview of the data that Callgrind collects; it can also be used to visualise Cachegrind's output. 可以下载kcachegrind源码，按照source中的README，编译，安装，比较简单。 kcachegrind源码下载链接： http://kcachegrind.sourceforge.net/html/Download.html 编译，安装命令： mkdir build cd build cmake .. Note： 执行cmake时遇到错误： simh@hxdl:~/Downloads/kcachegrind-0.7.4/build$ cmake .. CMake Error at /usr/share/cmake-3.5/Modules/FindKDE4.cmake:111 (message): ERROR: cmake/modules/FindKDE4Internal.cmake not found in /home/huangxing/.kde/share/apps;/usr/share/kde4/apps Call Stack (most recent call first): CMakeLists.txt:5 (find_package) sudo apt install kdelibs5-dev kdebase-apps 之后再执行cmake没有报错。 make sudo make install 打开工具试验： kcachegrind

背景介绍 近期在Hi3559A上开发，项目需要在不启动M7的情况下，通过sensor hub的uart0与外部mcu的通信。根据《外围设备驱动操作指南》中介绍的步骤： 下面提供一个 Soc 使用 Sensor Hub 的 uart0 外设资源的操作示例,SPI 与 I2C 均可参考以下步骤操作: 步骤 1. 配置 menuconfig。在内核源码目录下输入以下命令: make ARCH=arm64 CROSS_COMPILE=aarch64-himix100-linux- menuconfig 按以下路径选中配置: Platform selection ---> Enable to access the devices of m7 [*] 保存退出。 步骤 2. 在 uboot 环境配置 Sensor Hub 时钟。可通过使用默认的“config_m7”命令把 Sensor Hub 的时钟源配置为 PLL(192M)时钟,该命令也同时配置 Sensor Hub 复位请求屏蔽 位为不屏蔽状态。如用户需要自定义 Sensor Hub 配置,可参考《Hi3559A/C V100 ultra- HD Mobile Camera SoC 用户指南》3.12.6.6 章节。 步骤 3. 配置 Sensor Hub uart0 管脚复用。管脚配置可参考《Hi3559AV100_PINOUT_CN》或 《Hi3559CV100_PINOUT_CN》管脚控制寄存器。Uboot 下通过以下命令修改 uart0 设备 的管脚配置: mw 0x18050030 0x1 mw 0x18050034 0x1 步骤 4. 修改 dts 文件,把 uart5(uart5 对应的是 Sensor Hub 的 uart0,详细可参考 dtsi 的配置) 的状态改为 okay。重新编译。 步骤 5. 下载编译好的内核镜像至板端并启动,即可通过/dev/ttyAMA5 操作 Sensor Hub 的 uart0设备. 参照以上步骤进行后，uboot的启动log中确实有枚举到sensor hub的uart0, A73这侧会枚举到/dev/ttyAMA5设备。 [ 0.010651] Serial: AMBA PL011 UART driver [ 0.012245] 12100000.uart: ttyAMA0 at MMIO 0x12100000 (irq = 9, base_baud = 0) is a PL011 rev2 [ 0.475516] console [ttyAMA0] enabled [ 0.479470] 12101000.uart: ttyAMA1 at MMIO 0x12101000 (irq = 10, base_baud = 0) is a PL011 rev2 [ 0.488413] 12102000.uart: ttyAMA2 at MMIO 0x12102000 (irq = 11, base_baud = 0) is a PL011 rev2 [ 0.497349] 12103000.uart: ttyAMA3 at MMIO 0x12103000 (irq = 12, base_baud = 0) is a PL011 rev2 [ 0.506288] 12104000.uart: ttyAMA4 at MMIO 0x12104000 (irq = 13, base_baud = 0) is a PL011 rev2 [ 0.515232] 18060000.uart: ttyAMA5 at MMIO 0x18060000 (irq = 14, base_baud = 0) is a PL011 rev2 但是，通过该串口发送数据时，t发出数据的速率很低，只有600bps，远远达不到115200，此时就开始怀疑uart控制器的时钟或者sensor hub的时钟配置有问题。 查看了uboot中config_m7命令的实现： static int config_m7(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { writel(0x069E36E3, SENSOR_HUB_CRG_2); writel(0x00810001, SENSOR_HUB_CRG_1); writel(0x03, SENSOR_HUB_CRG_0); writel(0x1110, SENSOR_HUB_CRG_4); writel(0x01, SENSOR_HUB_CRG_11); printf("cortex-M7 is configed!\n"); return 0; } 通过以上流程看到config_m7配置了sensor hub的pll，选择pll为sensor hub的时钟输入，配置apb总线时钟，m7 cpu时钟等。也许是这里的配置还不够，导致了uart的输出速率很低。 现在我没有执行config_m7, 而是在kernel起来之后，通过himm配置0x1802001c为0x30000002，即设置uart0clk sel为soc_24M，撤销uart0位，uart时钟门控置1, 按照这种配置baud可以得到115200， 即只配置uart 0的相关时钟，没有配置pll及m7 cpu的时钟，这时串口输出速度正常了。 在此先mark一下，后续有时间再仔细查这个问题。