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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> |
d13744cd FW |
12 | |
13 | #include "trace.h" | |
f0868d1e | 14 | #include "trace_output.h" |
d13744cd FW |
15 | |
16 | static struct trace_array *boot_trace; | |
71566a0d | 17 | static bool pre_initcalls_finished; |
d13744cd | 18 | |
71566a0d FW |
19 | /* Tells the boot tracer that the pre_smp_initcalls are finished. |
20 | * So we are ready . | |
21 | * It doesn't enable sched events tracing however. | |
22 | * You have to call enable_boot_trace to do so. | |
23 | */ | |
d13744cd FW |
24 | void start_boot_trace(void) |
25 | { | |
71566a0d FW |
26 | pre_initcalls_finished = true; |
27 | } | |
28 | ||
29 | void enable_boot_trace(void) | |
30 | { | |
79fb0768 | 31 | if (boot_trace && pre_initcalls_finished) |
e168e051 | 32 | tracing_start_sched_switch_record(); |
d13744cd FW |
33 | } |
34 | ||
71566a0d | 35 | void disable_boot_trace(void) |
d13744cd | 36 | { |
79fb0768 | 37 | if (boot_trace && pre_initcalls_finished) |
e168e051 | 38 | tracing_stop_sched_switch_record(); |
d13744cd FW |
39 | } |
40 | ||
1c80025a | 41 | static int boot_trace_init(struct trace_array *tr) |
d13744cd FW |
42 | { |
43 | int cpu; | |
44 | boot_trace = tr; | |
45 | ||
79fb0768 SR |
46 | if (!tr) |
47 | return 0; | |
48 | ||
4462344e | 49 | for_each_cpu(cpu, cpu_possible_mask) |
3928a8a2 | 50 | tracing_reset(tr, cpu); |
d7ad44b6 | 51 | |
e168e051 | 52 | tracing_sched_switch_assign_trace(tr); |
1c80025a | 53 | return 0; |
d13744cd FW |
54 | } |
55 | ||
74239072 FW |
56 | static enum print_line_t |
57 | initcall_call_print_line(struct trace_iterator *iter) | |
d13744cd | 58 | { |
74239072 FW |
59 | struct trace_entry *entry = iter->ent; |
60 | struct trace_seq *s = &iter->seq; | |
61 | struct trace_boot_call *field; | |
62 | struct boot_trace_call *call; | |
63 | u64 ts; | |
64 | unsigned long nsec_rem; | |
9e9efffb | 65 | int ret; |
74239072 FW |
66 | |
67 | trace_assign_type(field, entry); | |
68 | call = &field->boot_call; | |
69 | ts = iter->ts; | |
70 | nsec_rem = do_div(ts, 1000000000); | |
71 | ||
72 | ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n", | |
73 | (unsigned long)ts, nsec_rem, call->func, call->caller); | |
74 | ||
75 | if (!ret) | |
76 | return TRACE_TYPE_PARTIAL_LINE; | |
77 | else | |
78 | return TRACE_TYPE_HANDLED; | |
79 | } | |
80 | ||
81 | static enum print_line_t | |
82 | initcall_ret_print_line(struct trace_iterator *iter) | |
83 | { | |
d13744cd | 84 | struct trace_entry *entry = iter->ent; |
d13744cd | 85 | struct trace_seq *s = &iter->seq; |
74239072 FW |
86 | struct trace_boot_ret *field; |
87 | struct boot_trace_ret *init_ret; | |
88 | u64 ts; | |
89 | unsigned long nsec_rem; | |
90 | int ret; | |
91 | ||
92 | trace_assign_type(field, entry); | |
93 | init_ret = &field->boot_ret; | |
94 | ts = iter->ts; | |
95 | nsec_rem = do_div(ts, 1000000000); | |
96 | ||
97 | ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s " | |
98 | "returned %d after %llu msecs\n", | |
99 | (unsigned long) ts, | |
100 | nsec_rem, | |
101 | init_ret->func, init_ret->result, init_ret->duration); | |
102 | ||
103 | if (!ret) | |
104 | return TRACE_TYPE_PARTIAL_LINE; | |
105 | else | |
cb5ab742 | 106 | return TRACE_TYPE_HANDLED; |
74239072 FW |
107 | } |
108 | ||
109 | static enum print_line_t initcall_print_line(struct trace_iterator *iter) | |
110 | { | |
111 | struct trace_entry *entry = iter->ent; | |
112 | ||
113 | switch (entry->type) { | |
114 | case TRACE_BOOT_CALL: | |
115 | return initcall_call_print_line(iter); | |
116 | case TRACE_BOOT_RET: | |
117 | return initcall_ret_print_line(iter); | |
118 | default: | |
119 | return TRACE_TYPE_UNHANDLED; | |
9e9efffb | 120 | } |
d13744cd FW |
121 | } |
122 | ||
123 | struct tracer boot_tracer __read_mostly = | |
124 | { | |
125 | .name = "initcall", | |
126 | .init = boot_trace_init, | |
213cc060 | 127 | .reset = tracing_reset_online_cpus, |
d13744cd FW |
128 | .print_line = initcall_print_line, |
129 | }; | |
130 | ||
74239072 | 131 | void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) |
d13744cd | 132 | { |
3928a8a2 | 133 | struct ring_buffer_event *event; |
74239072 | 134 | struct trace_boot_call *entry; |
d13744cd FW |
135 | struct trace_array *tr = boot_trace; |
136 | ||
79fb0768 | 137 | if (!tr || !pre_initcalls_finished) |
d13744cd FW |
138 | return; |
139 | ||
5601020f FW |
140 | /* Get its name now since this function could |
141 | * disappear because it is in the .init section. | |
142 | */ | |
74239072 FW |
143 | sprint_symbol(bt->func, (unsigned long)fn); |
144 | preempt_disable(); | |
145 | ||
51a763dd ACM |
146 | event = trace_buffer_lock_reserve(tr, TRACE_BOOT_CALL, |
147 | sizeof(*entry), 0, 0); | |
74239072 FW |
148 | if (!event) |
149 | goto out; | |
150 | entry = ring_buffer_event_data(event); | |
74239072 | 151 | entry->boot_call = *bt; |
51a763dd | 152 | trace_buffer_unlock_commit(tr, event, 0, 0); |
74239072 FW |
153 | out: |
154 | preempt_enable(); | |
155 | } | |
156 | ||
157 | void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) | |
158 | { | |
159 | struct ring_buffer_event *event; | |
160 | struct trace_boot_ret *entry; | |
74239072 FW |
161 | struct trace_array *tr = boot_trace; |
162 | ||
79fb0768 | 163 | if (!tr || !pre_initcalls_finished) |
74239072 FW |
164 | return; |
165 | ||
166 | sprint_symbol(bt->func, (unsigned long)fn); | |
d13744cd | 167 | preempt_disable(); |
d13744cd | 168 | |
51a763dd ACM |
169 | event = trace_buffer_lock_reserve(tr, TRACE_BOOT_RET, |
170 | sizeof(*entry), 0, 0); | |
3928a8a2 SR |
171 | if (!event) |
172 | goto out; | |
173 | entry = ring_buffer_event_data(event); | |
74239072 | 174 | entry->boot_ret = *bt; |
51a763dd | 175 | trace_buffer_unlock_commit(tr, event, 0, 0); |
3928a8a2 | 176 | out: |
d13744cd FW |
177 | preempt_enable(); |
178 | } |