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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" | |
14 | ||
15 | static struct trace_array *boot_trace; | |
71566a0d | 16 | static bool pre_initcalls_finished; |
d13744cd | 17 | |
71566a0d FW |
18 | /* Tells the boot tracer that the pre_smp_initcalls are finished. |
19 | * So we are ready . | |
20 | * It doesn't enable sched events tracing however. | |
21 | * You have to call enable_boot_trace to do so. | |
22 | */ | |
d13744cd FW |
23 | void start_boot_trace(void) |
24 | { | |
71566a0d FW |
25 | pre_initcalls_finished = true; |
26 | } | |
27 | ||
28 | void enable_boot_trace(void) | |
29 | { | |
d7ad44b6 | 30 | if (pre_initcalls_finished) |
e168e051 | 31 | tracing_start_sched_switch_record(); |
d13744cd FW |
32 | } |
33 | ||
71566a0d | 34 | void disable_boot_trace(void) |
d13744cd | 35 | { |
d7ad44b6 | 36 | if (pre_initcalls_finished) |
e168e051 | 37 | tracing_stop_sched_switch_record(); |
d13744cd FW |
38 | } |
39 | ||
79a9d461 | 40 | static void reset_boot_trace(struct trace_array *tr) |
097d036a | 41 | { |
75f5c47d SR |
42 | int cpu; |
43 | ||
44 | tr->time_start = ftrace_now(tr->cpu); | |
45 | ||
46 | for_each_online_cpu(cpu) | |
47 | tracing_reset(tr, cpu); | |
097d036a FW |
48 | } |
49 | ||
d13744cd FW |
50 | static void boot_trace_init(struct trace_array *tr) |
51 | { | |
52 | int cpu; | |
53 | boot_trace = tr; | |
54 | ||
d13744cd | 55 | for_each_cpu_mask(cpu, cpu_possible_map) |
3928a8a2 | 56 | tracing_reset(tr, cpu); |
d7ad44b6 | 57 | |
e168e051 | 58 | tracing_sched_switch_assign_trace(tr); |
d13744cd FW |
59 | } |
60 | ||
74239072 FW |
61 | static enum print_line_t |
62 | initcall_call_print_line(struct trace_iterator *iter) | |
d13744cd | 63 | { |
74239072 FW |
64 | struct trace_entry *entry = iter->ent; |
65 | struct trace_seq *s = &iter->seq; | |
66 | struct trace_boot_call *field; | |
67 | struct boot_trace_call *call; | |
68 | u64 ts; | |
69 | unsigned long nsec_rem; | |
9e9efffb | 70 | int ret; |
74239072 FW |
71 | |
72 | trace_assign_type(field, entry); | |
73 | call = &field->boot_call; | |
74 | ts = iter->ts; | |
75 | nsec_rem = do_div(ts, 1000000000); | |
76 | ||
77 | ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n", | |
78 | (unsigned long)ts, nsec_rem, call->func, call->caller); | |
79 | ||
80 | if (!ret) | |
81 | return TRACE_TYPE_PARTIAL_LINE; | |
82 | else | |
83 | return TRACE_TYPE_HANDLED; | |
84 | } | |
85 | ||
86 | static enum print_line_t | |
87 | initcall_ret_print_line(struct trace_iterator *iter) | |
88 | { | |
d13744cd | 89 | struct trace_entry *entry = iter->ent; |
d13744cd | 90 | struct trace_seq *s = &iter->seq; |
74239072 FW |
91 | struct trace_boot_ret *field; |
92 | struct boot_trace_ret *init_ret; | |
93 | u64 ts; | |
94 | unsigned long nsec_rem; | |
95 | int ret; | |
96 | ||
97 | trace_assign_type(field, entry); | |
98 | init_ret = &field->boot_ret; | |
99 | ts = iter->ts; | |
100 | nsec_rem = do_div(ts, 1000000000); | |
101 | ||
102 | ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s " | |
103 | "returned %d after %llu msecs\n", | |
104 | (unsigned long) ts, | |
105 | nsec_rem, | |
106 | init_ret->func, init_ret->result, init_ret->duration); | |
107 | ||
108 | if (!ret) | |
109 | return TRACE_TYPE_PARTIAL_LINE; | |
110 | else | |
cb5ab742 | 111 | return TRACE_TYPE_HANDLED; |
74239072 FW |
112 | } |
113 | ||
114 | static enum print_line_t initcall_print_line(struct trace_iterator *iter) | |
115 | { | |
116 | struct trace_entry *entry = iter->ent; | |
117 | ||
118 | switch (entry->type) { | |
119 | case TRACE_BOOT_CALL: | |
120 | return initcall_call_print_line(iter); | |
121 | case TRACE_BOOT_RET: | |
122 | return initcall_ret_print_line(iter); | |
123 | default: | |
124 | return TRACE_TYPE_UNHANDLED; | |
9e9efffb | 125 | } |
d13744cd FW |
126 | } |
127 | ||
128 | struct tracer boot_tracer __read_mostly = | |
129 | { | |
130 | .name = "initcall", | |
131 | .init = boot_trace_init, | |
097d036a | 132 | .reset = reset_boot_trace, |
d13744cd FW |
133 | .print_line = initcall_print_line, |
134 | }; | |
135 | ||
74239072 | 136 | void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) |
d13744cd | 137 | { |
3928a8a2 | 138 | struct ring_buffer_event *event; |
74239072 | 139 | struct trace_boot_call *entry; |
d13744cd FW |
140 | unsigned long irq_flags; |
141 | struct trace_array *tr = boot_trace; | |
142 | ||
71566a0d | 143 | if (!pre_initcalls_finished) |
d13744cd FW |
144 | return; |
145 | ||
5601020f FW |
146 | /* Get its name now since this function could |
147 | * disappear because it is in the .init section. | |
148 | */ | |
74239072 FW |
149 | sprint_symbol(bt->func, (unsigned long)fn); |
150 | preempt_disable(); | |
151 | ||
152 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), | |
153 | &irq_flags); | |
154 | if (!event) | |
155 | goto out; | |
156 | entry = ring_buffer_event_data(event); | |
157 | tracing_generic_entry_update(&entry->ent, 0, 0); | |
158 | entry->ent.type = TRACE_BOOT_CALL; | |
159 | entry->boot_call = *bt; | |
160 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); | |
161 | ||
162 | trace_wake_up(); | |
163 | ||
164 | out: | |
165 | preempt_enable(); | |
166 | } | |
167 | ||
168 | void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) | |
169 | { | |
170 | struct ring_buffer_event *event; | |
171 | struct trace_boot_ret *entry; | |
172 | unsigned long irq_flags; | |
173 | struct trace_array *tr = boot_trace; | |
174 | ||
175 | if (!pre_initcalls_finished) | |
176 | return; | |
177 | ||
178 | sprint_symbol(bt->func, (unsigned long)fn); | |
d13744cd | 179 | preempt_disable(); |
d13744cd | 180 | |
3928a8a2 SR |
181 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
182 | &irq_flags); | |
183 | if (!event) | |
184 | goto out; | |
185 | entry = ring_buffer_event_data(event); | |
38697053 | 186 | tracing_generic_entry_update(&entry->ent, 0, 0); |
74239072 FW |
187 | entry->ent.type = TRACE_BOOT_RET; |
188 | entry->boot_ret = *bt; | |
3928a8a2 | 189 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
d13744cd | 190 | |
d13744cd FW |
191 | trace_wake_up(); |
192 | ||
3928a8a2 | 193 | out: |
d13744cd FW |
194 | preempt_enable(); |
195 | } |