1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ftrace.h> 3 #include <linux/tracepoint.h> 4 #include <linux/kernel.h> 5 #include <linux/module.h> 6 #include <linux/init.h> 7 #include <linux/rv.h> 8 #include <rv/instrumentation.h> 9 #include <rv/da_monitor.h> 10 11 #define MODULE_NAME "wwnr" 12 13 #include <trace/events/rv.h> 14 #include <trace/events/sched.h> 15 16 #include "wwnr.h" 17 18 static struct rv_monitor rv_wwnr; 19 DECLARE_DA_MON_PER_TASK(wwnr, unsigned char); 20 21 static void handle_switch(void *data, bool preempt, struct task_struct *p, 22 struct task_struct *n, unsigned int prev_state) 23 { 24 /* start monitoring only after the first suspension */ 25 if (prev_state == TASK_INTERRUPTIBLE) 26 da_handle_start_event_wwnr(p, switch_out_wwnr); 27 else 28 da_handle_event_wwnr(p, switch_out_wwnr); 29 30 da_handle_event_wwnr(n, switch_in_wwnr); 31 } 32 33 static void handle_wakeup(void *data, struct task_struct *p) 34 { 35 da_handle_event_wwnr(p, wakeup_wwnr); 36 } 37 38 static int enable_wwnr(void) 39 { 40 int retval; 41 42 retval = da_monitor_init_wwnr(); 43 if (retval) 44 return retval; 45 46 rv_attach_trace_probe("wwnr", sched_switch, handle_switch); 47 rv_attach_trace_probe("wwnr", sched_wakeup, handle_wakeup); 48 49 return 0; 50 } 51 52 static void disable_wwnr(void) 53 { 54 rv_wwnr.enabled = 0; 55 56 rv_detach_trace_probe("wwnr", sched_switch, handle_switch); 57 rv_detach_trace_probe("wwnr", sched_wakeup, handle_wakeup); 58 59 da_monitor_destroy_wwnr(); 60 } 61 62 static struct rv_monitor rv_wwnr = { 63 .name = "wwnr", 64 .description = "wakeup while not running per-task testing model.", 65 .enable = enable_wwnr, 66 .disable = disable_wwnr, 67 .reset = da_monitor_reset_all_wwnr, 68 .enabled = 0, 69 }; 70 71 static int __init register_wwnr(void) 72 { 73 rv_register_monitor(&rv_wwnr); 74 return 0; 75 } 76 77 static void __exit unregister_wwnr(void) 78 { 79 rv_unregister_monitor(&rv_wwnr); 80 } 81 82 module_init(register_wwnr); 83 module_exit(unregister_wwnr); 84 85 MODULE_LICENSE("GPL"); 86 MODULE_AUTHOR("Daniel Bristot de Oliveira <bristot@kernel.org>"); 87 MODULE_DESCRIPTION("wwnr: wakeup while not running monitor"); 88