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[linux.git] / tools / lib / traceevent / plugins / plugin_futex.c
1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3  * Copyright (C) 2017 National Instruments Corp.
4  *
5  * Author: Julia Cartwright <[email protected]>
6  *
7  */
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <linux/futex.h>
12
13 #include "event-parse.h"
14
15 #define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
16
17 struct futex_args {
18         unsigned long long      uaddr;
19         unsigned long long      op;
20         unsigned long long      val;
21         unsigned long long      utime; /* or val2 */
22         unsigned long long      uaddr2;
23         unsigned long long      val3;
24 };
25
26 struct futex_op {
27         const char      *name;
28         const char      *fmt_val;
29         const char      *fmt_utime;
30         const char      *fmt_uaddr2;
31         const char      *fmt_val3;
32 };
33
34 static const struct futex_op futex_op_tbl[] = {
35         {            "FUTEX_WAIT", " val=0x%08llx", " utime=0x%08llx",               NULL,             NULL },
36         {            "FUTEX_WAKE",     " val=%llu",              NULL,               NULL,             NULL },
37         {              "FUTEX_FD",     " val=%llu",              NULL,               NULL,             NULL },
38         {         "FUTEX_REQUEUE",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx",             NULL },
39         {     "FUTEX_CMP_REQUEUE",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
40         {         "FUTEX_WAKE_OP",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
41         {         "FUTEX_LOCK_PI",            NULL, " utime=0x%08llx",               NULL,             NULL },
42         {       "FUTEX_UNLOCK_PI",            NULL,              NULL,               NULL,             NULL },
43         {      "FUTEX_TRYLOCK_PI",            NULL,              NULL,               NULL,             NULL },
44         {     "FUTEX_WAIT_BITSET", " val=0x%08llx", " utime=0x%08llx",               NULL, " val3=0x%08llx" },
45         {     "FUTEX_WAKE_BITSET",     " val=%llu",              NULL,               NULL, " val3=0x%08llx" },
46         { "FUTEX_WAIT_REQUEUE_PI", " val=0x%08llx", " utime=0x%08llx", " uaddr2=0x%08llx", " val3=0x%08llx" },
47         {  "FUTEX_CMP_REQUEUE_PI",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
48 };
49
50
51 static void futex_print(struct trace_seq *s, const struct futex_args *args,
52                         const struct futex_op *fop)
53 {
54         trace_seq_printf(s, " uaddr=0x%08llx", args->uaddr);
55
56         if (fop->fmt_val)
57                 trace_seq_printf(s, fop->fmt_val, args->val);
58
59         if (fop->fmt_utime)
60                 trace_seq_printf(s,fop->fmt_utime, args->utime);
61
62         if (fop->fmt_uaddr2)
63                 trace_seq_printf(s, fop->fmt_uaddr2, args->uaddr2);
64
65         if (fop->fmt_val3)
66                 trace_seq_printf(s, fop->fmt_val3, args->val3);
67 }
68
69 static int futex_handler(struct trace_seq *s, struct tep_record *record,
70                          struct tep_event *event, void *context)
71 {
72         const struct futex_op *fop;
73         struct futex_args args;
74         unsigned long long cmd;
75
76         if (tep_get_field_val(s, event, "uaddr", record, &args.uaddr, 1))
77                 return 1;
78
79         if (tep_get_field_val(s, event, "op", record, &args.op, 1))
80                 return 1;
81
82         if (tep_get_field_val(s, event, "val", record, &args.val, 1))
83                 return 1;
84
85         if (tep_get_field_val(s, event, "utime", record, &args.utime, 1))
86                 return 1;
87
88         if (tep_get_field_val(s, event, "uaddr2", record, &args.uaddr2, 1))
89                 return 1;
90
91         if (tep_get_field_val(s, event, "val3", record, &args.val3, 1))
92                 return 1;
93
94         cmd = args.op & FUTEX_CMD_MASK;
95         if (cmd >= ARRAY_SIZE(futex_op_tbl))
96                 return 1;
97
98         fop = &futex_op_tbl[cmd];
99
100         trace_seq_printf(s, "op=%s", fop->name);
101
102         if (args.op & FUTEX_PRIVATE_FLAG)
103                 trace_seq_puts(s, "|FUTEX_PRIVATE_FLAG");
104
105         if (args.op & FUTEX_CLOCK_REALTIME)
106                 trace_seq_puts(s, "|FUTEX_CLOCK_REALTIME");
107
108         futex_print(s, &args, fop);
109         return 0;
110 }
111
112 int TEP_PLUGIN_LOADER(struct tep_handle *tep)
113 {
114         tep_register_event_handler(tep, -1, "syscalls", "sys_enter_futex",
115                                    futex_handler, NULL);
116         return 0;
117 }
118
119 void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
120 {
121         tep_unregister_event_handler(tep, -1, "syscalls", "sys_enter_futex",
122                                      futex_handler, NULL);
123 }
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