Commit | Line | Data |
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d13744cd FW |
1 | /* |
2 | * ring buffer based initcalls tracer | |
3 | * | |
4 | * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com> | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/ftrace.h> | |
5601020f | 11 | #include <linux/kallsyms.h> |
a5dec557 | 12 | #include <linux/time.h> |
d13744cd FW |
13 | |
14 | #include "trace.h" | |
f0868d1e | 15 | #include "trace_output.h" |
d13744cd FW |
16 | |
17 | static struct trace_array *boot_trace; | |
71566a0d | 18 | static bool pre_initcalls_finished; |
d13744cd | 19 | |
71566a0d FW |
20 | /* Tells the boot tracer that the pre_smp_initcalls are finished. |
21 | * So we are ready . | |
22 | * It doesn't enable sched events tracing however. | |
23 | * You have to call enable_boot_trace to do so. | |
24 | */ | |
d13744cd FW |
25 | void start_boot_trace(void) |
26 | { | |
71566a0d FW |
27 | pre_initcalls_finished = true; |
28 | } | |
29 | ||
30 | void enable_boot_trace(void) | |
31 | { | |
79fb0768 | 32 | if (boot_trace && pre_initcalls_finished) |
e168e051 | 33 | tracing_start_sched_switch_record(); |
d13744cd FW |
34 | } |
35 | ||
71566a0d | 36 | void disable_boot_trace(void) |
d13744cd | 37 | { |
79fb0768 | 38 | if (boot_trace && pre_initcalls_finished) |
e168e051 | 39 | tracing_stop_sched_switch_record(); |
d13744cd FW |
40 | } |
41 | ||
1c80025a | 42 | static int boot_trace_init(struct trace_array *tr) |
d13744cd FW |
43 | { |
44 | int cpu; | |
45 | boot_trace = tr; | |
46 | ||
79fb0768 SR |
47 | if (!tr) |
48 | return 0; | |
49 | ||
4462344e | 50 | for_each_cpu(cpu, cpu_possible_mask) |
3928a8a2 | 51 | tracing_reset(tr, cpu); |
d7ad44b6 | 52 | |
e168e051 | 53 | tracing_sched_switch_assign_trace(tr); |
1c80025a | 54 | return 0; |
d13744cd FW |
55 | } |
56 | ||
74239072 FW |
57 | static enum print_line_t |
58 | initcall_call_print_line(struct trace_iterator *iter) | |
d13744cd | 59 | { |
74239072 FW |
60 | struct trace_entry *entry = iter->ent; |
61 | struct trace_seq *s = &iter->seq; | |
62 | struct trace_boot_call *field; | |
63 | struct boot_trace_call *call; | |
64 | u64 ts; | |
65 | unsigned long nsec_rem; | |
9e9efffb | 66 | int ret; |
74239072 FW |
67 | |
68 | trace_assign_type(field, entry); | |
69 | call = &field->boot_call; | |
70 | ts = iter->ts; | |
a5dec557 | 71 | nsec_rem = do_div(ts, NSEC_PER_SEC); |
74239072 FW |
72 | |
73 | ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n", | |
74 | (unsigned long)ts, nsec_rem, call->func, call->caller); | |
75 | ||
76 | if (!ret) | |
77 | return TRACE_TYPE_PARTIAL_LINE; | |
78 | else | |
79 | return TRACE_TYPE_HANDLED; | |
80 | } | |
81 | ||
82 | static enum print_line_t | |
83 | initcall_ret_print_line(struct trace_iterator *iter) | |
84 | { | |
d13744cd | 85 | struct trace_entry *entry = iter->ent; |
d13744cd | 86 | struct trace_seq *s = &iter->seq; |
74239072 FW |
87 | struct trace_boot_ret *field; |
88 | struct boot_trace_ret *init_ret; | |
89 | u64 ts; | |
90 | unsigned long nsec_rem; | |
91 | int ret; | |
92 | ||
93 | trace_assign_type(field, entry); | |
94 | init_ret = &field->boot_ret; | |
95 | ts = iter->ts; | |
a5dec557 | 96 | nsec_rem = do_div(ts, NSEC_PER_SEC); |
74239072 FW |
97 | |
98 | ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s " | |
99 | "returned %d after %llu msecs\n", | |
100 | (unsigned long) ts, | |
101 | nsec_rem, | |
102 | init_ret->func, init_ret->result, init_ret->duration); | |
103 | ||
104 | if (!ret) | |
105 | return TRACE_TYPE_PARTIAL_LINE; | |
106 | else | |
cb5ab742 | 107 | return TRACE_TYPE_HANDLED; |
74239072 FW |
108 | } |
109 | ||
110 | static enum print_line_t initcall_print_line(struct trace_iterator *iter) | |
111 | { | |
112 | struct trace_entry *entry = iter->ent; | |
113 | ||
114 | switch (entry->type) { | |
115 | case TRACE_BOOT_CALL: | |
116 | return initcall_call_print_line(iter); | |
117 | case TRACE_BOOT_RET: | |
118 | return initcall_ret_print_line(iter); | |
119 | default: | |
120 | return TRACE_TYPE_UNHANDLED; | |
9e9efffb | 121 | } |
d13744cd FW |
122 | } |
123 | ||
124 | struct tracer boot_tracer __read_mostly = | |
125 | { | |
126 | .name = "initcall", | |
127 | .init = boot_trace_init, | |
213cc060 | 128 | .reset = tracing_reset_online_cpus, |
d13744cd FW |
129 | .print_line = initcall_print_line, |
130 | }; | |
131 | ||
74239072 | 132 | void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) |
d13744cd | 133 | { |
3928a8a2 | 134 | struct ring_buffer_event *event; |
74239072 | 135 | struct trace_boot_call *entry; |
d13744cd FW |
136 | struct trace_array *tr = boot_trace; |
137 | ||
79fb0768 | 138 | if (!tr || !pre_initcalls_finished) |
d13744cd FW |
139 | return; |
140 | ||
5601020f FW |
141 | /* Get its name now since this function could |
142 | * disappear because it is in the .init section. | |
143 | */ | |
74239072 FW |
144 | sprint_symbol(bt->func, (unsigned long)fn); |
145 | preempt_disable(); | |
146 | ||
51a763dd ACM |
147 | event = trace_buffer_lock_reserve(tr, TRACE_BOOT_CALL, |
148 | sizeof(*entry), 0, 0); | |
74239072 FW |
149 | if (!event) |
150 | goto out; | |
151 | entry = ring_buffer_event_data(event); | |
74239072 | 152 | entry->boot_call = *bt; |
51a763dd | 153 | trace_buffer_unlock_commit(tr, event, 0, 0); |
74239072 FW |
154 | out: |
155 | preempt_enable(); | |
156 | } | |
157 | ||
158 | void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) | |
159 | { | |
160 | struct ring_buffer_event *event; | |
161 | struct trace_boot_ret *entry; | |
74239072 FW |
162 | struct trace_array *tr = boot_trace; |
163 | ||
79fb0768 | 164 | if (!tr || !pre_initcalls_finished) |
74239072 FW |
165 | return; |
166 | ||
167 | sprint_symbol(bt->func, (unsigned long)fn); | |
d13744cd | 168 | preempt_disable(); |
d13744cd | 169 | |
51a763dd ACM |
170 | event = trace_buffer_lock_reserve(tr, TRACE_BOOT_RET, |
171 | sizeof(*entry), 0, 0); | |
3928a8a2 SR |
172 | if (!event) |
173 | goto out; | |
174 | entry = ring_buffer_event_data(event); | |
74239072 | 175 | entry->boot_ret = *bt; |
51a763dd | 176 | trace_buffer_unlock_commit(tr, event, 0, 0); |
3928a8a2 | 177 | out: |
d13744cd FW |
178 | preempt_enable(); |
179 | } |