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 | 43 | { |
d13744cd FW |
44 | boot_trace = tr; |
45 | ||
79fb0768 SR |
46 | if (!tr) |
47 | return 0; | |
48 | ||
76f0d073 | 49 | tracing_reset_online_cpus(tr); |
d7ad44b6 | 50 | |
e168e051 | 51 | tracing_sched_switch_assign_trace(tr); |
1c80025a | 52 | return 0; |
d13744cd FW |
53 | } |
54 | ||
74239072 FW |
55 | static enum print_line_t |
56 | initcall_call_print_line(struct trace_iterator *iter) | |
d13744cd | 57 | { |
74239072 FW |
58 | struct trace_entry *entry = iter->ent; |
59 | struct trace_seq *s = &iter->seq; | |
60 | struct trace_boot_call *field; | |
61 | struct boot_trace_call *call; | |
62 | u64 ts; | |
63 | unsigned long nsec_rem; | |
9e9efffb | 64 | int ret; |
74239072 FW |
65 | |
66 | trace_assign_type(field, entry); | |
67 | call = &field->boot_call; | |
68 | ts = iter->ts; | |
a5dec557 | 69 | nsec_rem = do_div(ts, NSEC_PER_SEC); |
74239072 FW |
70 | |
71 | ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n", | |
72 | (unsigned long)ts, nsec_rem, call->func, call->caller); | |
73 | ||
74 | if (!ret) | |
75 | return TRACE_TYPE_PARTIAL_LINE; | |
76 | else | |
77 | return TRACE_TYPE_HANDLED; | |
78 | } | |
79 | ||
80 | static enum print_line_t | |
81 | initcall_ret_print_line(struct trace_iterator *iter) | |
82 | { | |
d13744cd | 83 | struct trace_entry *entry = iter->ent; |
d13744cd | 84 | struct trace_seq *s = &iter->seq; |
74239072 FW |
85 | struct trace_boot_ret *field; |
86 | struct boot_trace_ret *init_ret; | |
87 | u64 ts; | |
88 | unsigned long nsec_rem; | |
89 | int ret; | |
90 | ||
91 | trace_assign_type(field, entry); | |
92 | init_ret = &field->boot_ret; | |
93 | ts = iter->ts; | |
a5dec557 | 94 | nsec_rem = do_div(ts, NSEC_PER_SEC); |
74239072 FW |
95 | |
96 | ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s " | |
97 | "returned %d after %llu msecs\n", | |
98 | (unsigned long) ts, | |
99 | nsec_rem, | |
100 | init_ret->func, init_ret->result, init_ret->duration); | |
101 | ||
102 | if (!ret) | |
103 | return TRACE_TYPE_PARTIAL_LINE; | |
104 | else | |
cb5ab742 | 105 | return TRACE_TYPE_HANDLED; |
74239072 FW |
106 | } |
107 | ||
108 | static enum print_line_t initcall_print_line(struct trace_iterator *iter) | |
109 | { | |
110 | struct trace_entry *entry = iter->ent; | |
111 | ||
112 | switch (entry->type) { | |
113 | case TRACE_BOOT_CALL: | |
114 | return initcall_call_print_line(iter); | |
115 | case TRACE_BOOT_RET: | |
116 | return initcall_ret_print_line(iter); | |
117 | default: | |
118 | return TRACE_TYPE_UNHANDLED; | |
9e9efffb | 119 | } |
d13744cd FW |
120 | } |
121 | ||
122 | struct tracer boot_tracer __read_mostly = | |
123 | { | |
124 | .name = "initcall", | |
125 | .init = boot_trace_init, | |
213cc060 | 126 | .reset = tracing_reset_online_cpus, |
d13744cd FW |
127 | .print_line = initcall_print_line, |
128 | }; | |
129 | ||
74239072 | 130 | void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) |
d13744cd | 131 | { |
60ba7702 | 132 | struct ftrace_event_call *call = &event_boot_call; |
3928a8a2 | 133 | struct ring_buffer_event *event; |
e77405ad | 134 | struct ring_buffer *buffer; |
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 | ||
e77405ad SR |
147 | buffer = tr->buffer; |
148 | event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_CALL, | |
51a763dd | 149 | sizeof(*entry), 0, 0); |
74239072 FW |
150 | if (!event) |
151 | goto out; | |
152 | entry = ring_buffer_event_data(event); | |
74239072 | 153 | entry->boot_call = *bt; |
60ba7702 SR |
154 | if (!filter_check_discard(call, entry, buffer, event)) |
155 | trace_buffer_unlock_commit(buffer, event, 0, 0); | |
74239072 FW |
156 | out: |
157 | preempt_enable(); | |
158 | } | |
159 | ||
160 | void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) | |
161 | { | |
60ba7702 | 162 | struct ftrace_event_call *call = &event_boot_ret; |
74239072 | 163 | struct ring_buffer_event *event; |
e77405ad | 164 | struct ring_buffer *buffer; |
74239072 | 165 | struct trace_boot_ret *entry; |
74239072 FW |
166 | struct trace_array *tr = boot_trace; |
167 | ||
79fb0768 | 168 | if (!tr || !pre_initcalls_finished) |
74239072 FW |
169 | return; |
170 | ||
171 | sprint_symbol(bt->func, (unsigned long)fn); | |
d13744cd | 172 | preempt_disable(); |
d13744cd | 173 | |
e77405ad SR |
174 | buffer = tr->buffer; |
175 | event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_RET, | |
51a763dd | 176 | sizeof(*entry), 0, 0); |
3928a8a2 SR |
177 | if (!event) |
178 | goto out; | |
179 | entry = ring_buffer_event_data(event); | |
74239072 | 180 | entry->boot_ret = *bt; |
60ba7702 SR |
181 | if (!filter_check_discard(call, entry, buffer, event)) |
182 | trace_buffer_unlock_commit(buffer, event, 0, 0); | |
3928a8a2 | 183 | out: |
d13744cd FW |
184 | preempt_enable(); |
185 | } |