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 "sssw" 12 13 #include <trace/events/sched.h> 14 #include <trace/events/signal.h> 15 #include <rv_trace.h> 16 #include <monitors/sched/sched.h> 17 18 #include "sssw.h" 19 20 static struct rv_monitor rv_sssw; 21 DECLARE_DA_MON_PER_TASK(sssw, unsigned char); 22 23 static void handle_sched_set_state(void *data, struct task_struct *tsk, int state) 24 { 25 if (state == TASK_RUNNING) 26 da_handle_start_event_sssw(tsk, sched_set_state_runnable_sssw); 27 else 28 da_handle_event_sssw(tsk, sched_set_state_sleepable_sssw); 29 } 30 31 static void handle_sched_switch(void *data, bool preempt, 32 struct task_struct *prev, 33 struct task_struct *next, 34 unsigned int prev_state) 35 { 36 if (preempt) 37 da_handle_event_sssw(prev, sched_switch_preempt_sssw); 38 else if (prev_state == TASK_RUNNING) 39 da_handle_event_sssw(prev, sched_switch_yield_sssw); 40 else if (prev_state == TASK_RTLOCK_WAIT) 41 /* special case of sleeping task with racy conditions */ 42 da_handle_event_sssw(prev, sched_switch_blocking_sssw); 43 else 44 da_handle_event_sssw(prev, sched_switch_suspend_sssw); 45 da_handle_event_sssw(next, sched_switch_in_sssw); 46 } 47 48 static void handle_sched_wakeup(void *data, struct task_struct *p) 49 { 50 /* 51 * Wakeup can also lead to signal_wakeup although the system is 52 * actually runnable. The monitor can safely start with this event. 53 */ 54 da_handle_start_event_sssw(p, sched_wakeup_sssw); 55 } 56 57 static void handle_signal_deliver(void *data, int sig, 58 struct kernel_siginfo *info, 59 struct k_sigaction *ka) 60 { 61 da_handle_event_sssw(current, signal_deliver_sssw); 62 } 63 64 static int enable_sssw(void) 65 { 66 int retval; 67 68 retval = da_monitor_init_sssw(); 69 if (retval) 70 return retval; 71 72 rv_attach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state); 73 rv_attach_trace_probe("sssw", sched_switch, handle_sched_switch); 74 rv_attach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup); 75 rv_attach_trace_probe("sssw", signal_deliver, handle_signal_deliver); 76 77 return 0; 78 } 79 80 static void disable_sssw(void) 81 { 82 rv_sssw.enabled = 0; 83 84 rv_detach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state); 85 rv_detach_trace_probe("sssw", sched_switch, handle_sched_switch); 86 rv_detach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup); 87 rv_detach_trace_probe("sssw", signal_deliver, handle_signal_deliver); 88 89 da_monitor_destroy_sssw(); 90 } 91 92 static struct rv_monitor rv_sssw = { 93 .name = "sssw", 94 .description = "set state sleep and wakeup.", 95 .enable = enable_sssw, 96 .disable = disable_sssw, 97 .reset = da_monitor_reset_all_sssw, 98 .enabled = 0, 99 }; 100 101 static int __init register_sssw(void) 102 { 103 return rv_register_monitor(&rv_sssw, &rv_sched); 104 } 105 106 static void __exit unregister_sssw(void) 107 { 108 rv_unregister_monitor(&rv_sssw); 109 } 110 111 module_init(register_sssw); 112 module_exit(unregister_sssw); 113 114 MODULE_LICENSE("GPL"); 115 MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>"); 116 MODULE_DESCRIPTION("sssw: set state sleep and wakeup."); 117