mirror of
https://github.com/gatieme/LDD-LinuxDeviceDrivers.git
synced 2026-09-22 12:43:39 +08:00
kernel debug tools...
This commit is contained in:
gatieme
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# ------------------------------------------------------------------------------
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#
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# Makefile for the LDD-LinuxDeviceDrivers.
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#
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# Author: gatieme
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# Create: 2016-07-29 15:50:46
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# Last modified: 2016-07-29 16:10:29
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# Description:
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# This program is loaded as a kernel(v2.6.18 or later) module.
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# Use "make install" to load it into kernel.
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# Use "make remove" to remove the module out of kernel.
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#
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# ------------------------------------------------------------------------------
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# my driver description
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DRIVER_VERSION := "1.0.0"
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DRIVER_AUTHOR := "Gatieme @ AderStep Inc..."
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DRIVER_DESC := "Linux input module for Elo MultiTouch(MT) devices"
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DRIVER_LICENSE := "Dual BSD/GPL"
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MODULE_NAME := ftrace_demo
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MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -std=c99
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ifneq ($(KERNELRELEASE),)
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#CFG_FLAGS += -O2 -I./
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#EXTRA_CFLAGS += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
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obj-m := $(MODULE_NAME).o #print_vmarea.o
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else
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KERNELDIR ?= /lib/modules/$(shell uname -r)/build
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PWD := $(shell pwd)
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modules:
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make -C $(KERNELDIR) M=$(PWD) modules
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modules_install:
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make -C $(KERNELDIR) M=$(PWD) modules_install
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insmod:
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sudo insmod $(MODULE_NAME).ko
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reinsmod:
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sudo rmmod $(MODULE_NAME)
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sudo insmod $(MODULE_NAME).ko
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github:
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cd $(ROOT) && make github
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rmmod:
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sudo rmmod $(MODULE_NAME)
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test :
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sudo ../injector/memInjector -l stack -m random -t word_0 --time 1 --timeout 3 -p 1
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clean:
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make -C $(KERNELDIR) M=$(PWD) clean
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rm -f modules.order Module.symvers Module.markers
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.PHNOY:
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modules modules_install clean
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endif
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@@ -0,0 +1,24 @@
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/*
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* ftrace_demo.c
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* http://www.ibm.com/developerworks/cn/linux/l-cn-ftrace3/
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* http://lxr.free-electrons.com/source/include/trace/events/context_tracking.h 貌似没实现
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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MODULE_LICENSE("GPL");
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static int ftrace_demo_init(void)
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{
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trace_printk("Can not see this in trace unless loaded for the second time\n");
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return 0;
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}
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static void ftrace_demo_exit(void)
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{
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trace_printk("Module unloading\n");
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}
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module_init(ftrace_demo_init);
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module_exit(ftrace_demo_exit);
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@@ -0,0 +1,81 @@
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# ------------------------------------------------------------------------------
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#
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# Makefile for the LDD-LinuxDeviceDrivers.
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#
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# Author: gatieme
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# Create: 2016-07-29 15:50:46
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# Last modified: 2016-07-29 16:10:29
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# Description:
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# This program is loaded as a kernel(v2.6.18 or later) module.
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# Use "make install" to load it into kernel.
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# Use "make remove" to remove the module out of kernel.
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#
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# ------------------------------------------------------------------------------
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# my driver description
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DRIVER_VERSION := "1.0.0"
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DRIVER_AUTHOR := "Gatieme @ AderStep Inc..."
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DRIVER_DESC := "Linux input module for Elo MultiTouch(MT) devices"
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DRIVER_LICENSE := "Dual BSD/GPL"
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MODULE_NAME := trace-events-sample
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#MODCFLAGS:=-O2 -Wall -DMODULE -D__KERNEL__ -DLINUX -std=c99
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SRC := /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/debug/trace/trace-events-sample
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EXTRA_CFLAGS += -I$(SRC)
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ifneq ($(KERNELRELEASE),)
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obj-m := $(MODULE_NAME).o #print_vmarea.o
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else
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KERNELDIR ?= /lib/modules/$(shell uname -r)/build
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PWD := $(shell pwd)
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modules:
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make -C $(KERNELDIR) M=$(PWD) modules
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modules_install:
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make -C $(KERNELDIR) M=$(PWD) modules_install
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insmod:
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sudo insmod $(MODULE_NAME).ko
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reinsmod:
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sudo rmmod $(MODULE_NAME)
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sudo insmod $(MODULE_NAME).ko
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github:
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cd $(ROOT) && make github
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rmmod:
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sudo rmmod $(MODULE_NAME)
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test :
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cat /sys/kernel/debug/mydebug/a
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cat /sys/kernel/debug/mydebug/b
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cat /sys/kernel/debug/mydebug/subdir/c
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clean:
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make -C $(KERNELDIR) M=$(PWD) clean
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rm -f modules.order Module.symvers Module.markers
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.PHNOY:
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modules modules_install clean
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endif
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@@ -0,0 +1,40 @@
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http://blog.csdn.net/arethe/article/details/6293505]
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http://lxr.free-electrons.com/source/Documentation/trace/tracepoints.txt
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https://lwn.net/Articles/410200/
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#1 驱动安装
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-------
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sudo insmod trace-events-sample.ko
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#2 检查驱动
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-------
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cat /sys/kernel/debug/tracing/available_events | grep sample-trace
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cd /sys/kernel/debug/tracing/events/sample-trace
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#3 列出所有的events
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-------
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find /sys/kernel/debug/tracing/events -type d
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cat /sys/kernel/debug/tracing/available_events
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trace-cmd list
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perf list 2>&1 | grep Tracepoint
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#3 trace-cmd
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-------
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sudo trace-cmd reset
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sudo trace-cmd record -e sample-trace:foo_with_template_print
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sudo trace-cmd report
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@@ -0,0 +1,131 @@
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#include <linux/module.h>
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#include <linux/kthread.h>
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/*
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* Any file that uses trace points, must include the header.
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* But only one file, must include the header by defining
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* CREATE_TRACE_POINTS first. This will make the C code that
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* creates the handles for the trace points.
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*/
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#define CREATE_TRACE_POINTS
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#include "trace-events-sample.h"
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static const char *random_strings[] = {
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"Mother Goose",
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"Snoopy",
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"Gandalf",
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"Frodo",
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"One ring to rule them all"
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};
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static void simple_thread_func(int cnt)
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{
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int array[6];
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int len = cnt % 5;
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int i;
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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for (i = 0; i < len; i++)
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array[i] = i + 1;
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array[i] = 0;
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/* Silly tracepoints */
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trace_foo_bar("hello", cnt, array, random_strings[len],
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tsk_cpus_allowed(current));
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trace_foo_with_template_simple("HELLO", cnt);
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trace_foo_bar_with_cond("Some times print", cnt);
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trace_foo_with_template_cond("prints other times", cnt);
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trace_foo_with_template_print("I have to be different", cnt);
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}
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static int simple_thread(void *arg)
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{
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int cnt = 0;
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while (!kthread_should_stop())
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simple_thread_func(cnt++);
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return 0;
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}
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static struct task_struct *simple_tsk;
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static struct task_struct *simple_tsk_fn;
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static void simple_thread_func_fn(int cnt)
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{
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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/* More silly tracepoints */
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trace_foo_bar_with_fn("Look at me", cnt);
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trace_foo_with_template_fn("Look at me too", cnt);
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}
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static int simple_thread_fn(void *arg)
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{
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int cnt = 0;
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while (!kthread_should_stop())
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simple_thread_func_fn(cnt++);
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return 0;
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}
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static DEFINE_MUTEX(thread_mutex);
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int foo_bar_reg(void)
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{
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pr_info("Starting thread for foo_bar_fn\n");
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/*
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* We shouldn't be able to start a trace when the module is
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* unloading (there's other locks to prevent that). But
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* for consistency sake, we still take the thread_mutex.
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*/
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mutex_lock(&thread_mutex);
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simple_tsk_fn = kthread_run(simple_thread_fn, NULL, "event-sample-fn");
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mutex_unlock(&thread_mutex);
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return 0;
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}
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void foo_bar_unreg(void)
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{
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pr_info("Killing thread for foo_bar_fn\n");
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/* protect against module unloading */
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mutex_lock(&thread_mutex);
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if (simple_tsk_fn)
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kthread_stop(simple_tsk_fn);
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simple_tsk_fn = NULL;
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mutex_unlock(&thread_mutex);
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}
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static int __init trace_event_init(void)
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{
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simple_tsk = kthread_run(simple_thread, NULL, "event-sample");
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if (IS_ERR(simple_tsk))
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return -1;
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return 0;
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}
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static void __exit trace_event_exit(void)
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{
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kthread_stop(simple_tsk);
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mutex_lock(&thread_mutex);
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if (simple_tsk_fn)
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kthread_stop(simple_tsk_fn);
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simple_tsk_fn = NULL;
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mutex_unlock(&thread_mutex);
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}
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module_init(trace_event_init);
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module_exit(trace_event_exit);
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MODULE_AUTHOR("Steven Rostedt");
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MODULE_DESCRIPTION("trace-events-sample");
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MODULE_LICENSE("GPL");
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