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lineage安卓实体机系统上kernel调试log,trace开发的技巧汇总

lineage安卓实体机系统上kernel调试log,trace开发的技巧汇总

马哥近期因为有一些需求需要在kernel中进行相关的调试验证,因为kernel开发相比fw开发还是有一些差别,所以这里记录一下kernel开发的一些调试追踪技巧差异。

kernel中加入相关日志打印调试:

如何在kernel中打印日志,类似android.util.Log一样

// 1. 直接用 printk

#include<linux/printk.h>                                                                                                                                                                                       printk(KERN_ERR "something wrong\n");         

// 2. pr_xxx 宏 (不需要 dev,自动加模块名)

  pr_info("power key pressed\n");      // 输出: <6>qpnp-power-on: power key pressed                                                                                                                                  pr_err("something failed\n");                                                                                                                                                                                      pr_debug("debug info\n");                

// 3. dev_xxx (需要 dev)

  dev_info(dev, "power key pressed\n");                                                                                                                                                                              dev_err(dev, "something failed\n");                                                                                                                                                                                dev_dbg(dev, "debug info\n");      

抓取方式:logcat -b all 或者logcat -b kernel

kernel中加入相关的堆栈打印

如何在kernel中追踪一些方法的调用栈,可以和我们framework堆栈追踪一样简单?

#include<linux/printk.h> //引入头文件     dump_stack();

可以看看下面是power键案例

     0     0 I Call trace:       0     0 I         : [<000000004d1d622f>] dump_backtrace+0x0/0x41c     0     0 I         : [<00000000422c8119>] show_stack+0x14/0x1c     0     0 I         : [<00000000d01c0dc6>] dump_stack+0xc4/0xfc     0     0 I         : [<00000000554b8d0a>] qpnp_kpdpwr_irq+0x34/0x1b8     0     0 I         : [<0000000053294c6d>] __handle_irq_event_percpu+0x10c/0x2a4     0     0 I         : [<000000000f0fb616>] handle_irq_event+0x54/0xc0     0     0 I         : [<000000003d3e783c>] handle_edge_irq+0xc8/0x188     0     0 I         : [<00000000c64e8964>] generic_handle_irq+0x24/0x3c     0     0 I         : [<00000000463cc320>] periph_interrupt+0x74/0x114     0     0 I         : [<000000003078d434>] pmic_arb_chained_irq+0x13c/0x228     0     0 I         : [<00000000b02011aa>] __handle_domain_irq+0x7c/0xbc     0     0 I         : [<000000001323b657>] gic_handle_irq+0xf8/0x198     0     0 I         : Exception stack(0xffffff8e6f203d00 to 0xffffff8e6f203e30)     0     0 I 3d00    : fffffff70b947632 00000000000001c0 0000000000000001 0000000000000001     0     0 I 3d20    : 00000008f46b85f0 0000000000000001 00000000000006a0 0000000001312d00     0     0 I 3d40    : 0000000000000000 0000000000000001 0018701a7711de00 0000000034155555     0     0 I 3d60    : 0000000000000018 0000000000001b0a 0000000000000000 000000000000009c     0     0 I 3d80    : 0000000000049959 00000000000003d1 0000000000000004 0000000000000000     0     0 I 3da0    : ffffffc26c1b6018 ffffff8e6ec9ba90 000000340e8ca000 ffffff8e6f330000     0     0 I 3dc0    : 0000000000000000 000000000000003b ffffff8e6ec9ba48 ffffffc27d565a50     0     0 I 3de0    : ffffff8e6f221900 ffffff8e6f203e40 ffffff8e6d957ec4 ffffff8e6f203e30     0     0 I 3e00    : ffffff8e6d957f00 00000000a0c00145 000000340e8ca000 ffffff8e6ec9ba90     0     0 I 3e20    : ffffffffffffffff 0000000000000000    0     0 I         : [<00000000a7ce830f>] el1_irq+0xe8/0x18c    0     0 I         : [<000000001cdfc47a>] lpm_cpuidle_enter+0x46c/0x4b0    0     0 I         : [<0000000029da8379>] cpuidle_enter_state+0x1ac/0x31c    0     0 I         : [<0000000093efd304>] cpuidle_enter+0x18/0x20    0     0 I         : [<00000000a609a1d9>] cpu_startup_entry+0x164/0x1f4    0     0 I         : [<0000000021dd2f61>] rest_init+0x7c/0x88    0     0 I         : [<000000005a292c16>] start_kernel+0x440/0x4c0    0     0 I         : [<00000000e3d213b3>] __primary_switched+0x64/0x90

kernel中添加相关的perfetto的trace

+++ b/drivers/input/evdev.c@@ -26,6 +26,7 @@#include<linux/major.h>#include<linux/device.h>#include<linux/cdev.h>+#include<trace/events/input.h>#include"input-compat.h"enum evdev_clock_type {@@ -306,6 +307,8 @@ staticvoidevdev_events(struct input_handle *handle,        struct evdev_client *client;ktime_t ev_time[EV_CLK_MAX];+       INPUT_ATRACE_BEGIN("evdev_deliver");+        ev_time[EV_CLK_MONO] = ktime_get();        ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]);        ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO],@@ -322,6 +325,8 @@ staticvoid evdev_events(struct input_handle *handle,                        evdev_pass_values(client, vals, count, ev_time);        rcu_read_unlock();++       INPUT_ATRACE_END("evdev_deliver"); }

主要就是 1、#include相关的头文件 <trace/events/input.h>

2、INPUT_ATRACE_BEGIN("evdev_deliver");

实际上最后也是调用trace_tracing_mark_write kernel/xiaomi/sdm710/include/trace/events/input.h

/* * Convenience wrappers — use these in driver code. * * Usage in ISR: *   INPUT_ATRACE_BEGIN("input_irq"); *   ... handle interrupt, call input_report_* / input_sync ... *   INPUT_ATRACE_END("input_irq"); */#define INPUT_ATRACE_BEGIN(name) \ trace_tracing_mark_write(current->tgid, name, 1)#define INPUT_ATRACE_END(name) \ trace_tracing_mark_write(current->tgid, name, 0)

添加相关的log

编译命令kernel相关img的:

make bootimage

重启进入fastboot模式

adb reboot bootloader
在这里插入图片描述

刷入对应的boot.img

fastboot flash boot out/target/product/grus/boot.imgSending 'boot' (131072 KB)                         OKAY [  2.997s]Writing 'boot'                                     OKAY [  0.640s]Finished. Total time: 3.734s

然后再进行重启:

 fastboot rebootRebooting                                          OKAY [  0.000s]Finished. Total time: 0.401s

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  1. CONNECT:[ UseTime:0.000590s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000807s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000550s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000580s ]
  8. SELECT * FROM `article` WHERE `id` = 781368 LIMIT 1 [ RunTime:0.000973s ]
  9. UPDATE `article` SET `lasttime` = 1782318739 WHERE `id` = 781368 [ RunTime:0.000727s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000226s ]
  11. SELECT * FROM `article` WHERE `id` < 781368 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 781368 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000489s ]
  13. SELECT * FROM `article` WHERE `id` < 781368 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001037s ]
  14. SELECT * FROM `article` WHERE `id` < 781368 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001807s ]
  15. SELECT * FROM `article` WHERE `id` < 781368 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000771s ]
0.094479s