Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Simple stack backtrace regression test module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * (C) Copyright 2008 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Author: Arjan van de Ven <arjan@linux.intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static void backtrace_test_normal(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	pr_info("Testing a backtrace from process context.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	pr_info("The following trace is a kernel self test and not a bug!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static DECLARE_COMPLETION(backtrace_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void backtrace_test_irq_callback(unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	complete(&backtrace_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static void backtrace_test_irq(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	pr_info("Testing a backtrace from irq context.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	pr_info("The following trace is a kernel self test and not a bug!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	init_completion(&backtrace_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	tasklet_schedule(&backtrace_tasklet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	wait_for_completion(&backtrace_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #ifdef CONFIG_STACKTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static void backtrace_test_saved(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	unsigned long entries[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	unsigned int nr_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	pr_info("Testing a saved backtrace.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	pr_info("The following trace is a kernel self test and not a bug!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	stack_trace_print(entries, nr_entries, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static void backtrace_test_saved(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	pr_info("Saved backtrace test skipped.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int backtrace_regression_test(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	pr_info("====[ backtrace testing ]===========\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	backtrace_test_normal();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	backtrace_test_irq();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	backtrace_test_saved();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	pr_info("====[ end of backtrace testing ]====\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static void exitf(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) module_init(backtrace_regression_test);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) module_exit(exitf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");