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 10 #define MODULE_NAME "sssw" 11 12 #include <trace/events/sched.h> 13 #include <trace/events/signal.h> 14 #include <rv_trace.h> 15 #include <monitors/sched/sched.h> 16 17 #define RV_MON_TYPE RV_MON_PER_TASK 18 #include "sssw.h" 19 #include <rv/da_monitor.h> 20 21 static void handle_sched_set_state(void *data, struct task_struct *tsk, int state) 22 { 23 if (state == TASK_RUNNING) 24 da_handle_start_event(tsk, sched_set_state_runnable_sssw); 25 else 26 da_handle_event(tsk, sched_set_state_sleepable_sssw); 27 } 28 29 static void handle_sched_switch(void *data, bool preempt, 30 struct task_struct *prev, 31 struct task_struct *next, 32 unsigned int prev_state) 33 { 34 if (preempt) 35 da_handle_event(prev, sched_switch_preempt_sssw); 36 else if (prev_state == TASK_RUNNING) 37 da_handle_event(prev, sched_switch_yield_sssw); 38 else if (prev_state == TASK_RTLOCK_WAIT) 39 /* special case of sleeping task with racy conditions */ 40 da_handle_event(prev, sched_switch_blocking_sssw); 41 else 42 da_handle_event(prev, sched_switch_suspend_sssw); 43 da_handle_event(next, sched_switch_in_sssw); 44 } 45 46 static void handle_sched_wakeup(void *data, struct task_struct *p) 47 { 48 /* 49 * Wakeup can also lead to signal_wakeup although the system is 50 * actually runnable. The monitor can safely start with this event. 51 */ 52 da_handle_start_event(p, sched_wakeup_sssw); 53 } 54 55 static void handle_signal_deliver(void *data, int sig, 56 struct kernel_siginfo *info, 57 struct k_sigaction *ka) 58 { 59 da_handle_event(current, signal_deliver_sssw); 60 } 61 62 static int enable_sssw(void) 63 { 64 int retval; 65 66 retval = da_monitor_init(); 67 if (retval) 68 return retval; 69 70 rv_attach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state); 71 rv_attach_trace_probe("sssw", sched_switch, handle_sched_switch); 72 rv_attach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup); 73 rv_attach_trace_probe("sssw", signal_deliver, handle_signal_deliver); 74 75 return 0; 76 } 77 78 static void disable_sssw(void) 79 { 80 rv_this.enabled = 0; 81 82 rv_detach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state); 83 rv_detach_trace_probe("sssw", sched_switch, handle_sched_switch); 84 rv_detach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup); 85 rv_detach_trace_probe("sssw", signal_deliver, handle_signal_deliver); 86 87 da_monitor_destroy(); 88 } 89 90 static struct rv_monitor rv_this = { 91 .name = "sssw", 92 .description = "set state sleep and wakeup.", 93 .enable = enable_sssw, 94 .disable = disable_sssw, 95 .reset = da_monitor_reset_all, 96 .enabled = 0, 97 }; 98 99 static int __init register_sssw(void) 100 { 101 return rv_register_monitor(&rv_this, &rv_sched); 102 } 103 104 static void __exit unregister_sssw(void) 105 { 106 rv_unregister_monitor(&rv_this); 107 } 108 109 module_init(register_sssw); 110 module_exit(unregister_sssw); 111 112 MODULE_LICENSE("GPL"); 113 MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>"); 114 MODULE_DESCRIPTION("sssw: set state sleep and wakeup."); 115