aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/trace/trace_boot.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/trace/trace_boot.c')
-rw-r--r--kernel/trace/trace_boot.c160
1 files changed, 110 insertions, 50 deletions
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index d0a5e50eeff2..366c8c333e13 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -13,101 +13,161 @@
13#include "trace.h" 13#include "trace.h"
14 14
15static struct trace_array *boot_trace; 15static struct trace_array *boot_trace;
16static int trace_boot_enabled; 16static bool pre_initcalls_finished;
17 17
18 18/* Tells the boot tracer that the pre_smp_initcalls are finished.
19/* Should be started after do_pre_smp_initcalls() in init/main.c */ 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 */
20void start_boot_trace(void) 23void start_boot_trace(void)
21{ 24{
22 trace_boot_enabled = 1; 25 pre_initcalls_finished = true;
23} 26}
24 27
25void stop_boot_trace(void) 28void enable_boot_trace(void)
26{ 29{
27 trace_boot_enabled = 0; 30 if (pre_initcalls_finished)
31 tracing_start_sched_switch_record();
28} 32}
29 33
30void reset_boot_trace(struct trace_array *tr) 34void disable_boot_trace(void)
31{ 35{
32 stop_boot_trace(); 36 if (pre_initcalls_finished)
37 tracing_stop_sched_switch_record();
33} 38}
34 39
35static void boot_trace_init(struct trace_array *tr) 40static int boot_trace_init(struct trace_array *tr)
36{ 41{
37 int cpu; 42 int cpu;
38 boot_trace = tr; 43 boot_trace = tr;
39 44
40 trace_boot_enabled = 0; 45 for_each_cpu(cpu, cpu_possible_mask)
41
42 for_each_cpu_mask(cpu, cpu_possible_map)
43 tracing_reset(tr, cpu); 46 tracing_reset(tr, cpu);
47
48 tracing_sched_switch_assign_trace(tr);
49 return 0;
44} 50}
45 51
46static void boot_trace_ctrl_update(struct trace_array *tr) 52static enum print_line_t
53initcall_call_print_line(struct trace_iterator *iter)
47{ 54{
48 if (tr->ctrl) 55 struct trace_entry *entry = iter->ent;
49 start_boot_trace(); 56 struct trace_seq *s = &iter->seq;
57 struct trace_boot_call *field;
58 struct boot_trace_call *call;
59 u64 ts;
60 unsigned long nsec_rem;
61 int ret;
62
63 trace_assign_type(field, entry);
64 call = &field->boot_call;
65 ts = iter->ts;
66 nsec_rem = do_div(ts, 1000000000);
67
68 ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n",
69 (unsigned long)ts, nsec_rem, call->func, call->caller);
70
71 if (!ret)
72 return TRACE_TYPE_PARTIAL_LINE;
50 else 73 else
51 stop_boot_trace(); 74 return TRACE_TYPE_HANDLED;
52} 75}
53 76
54static enum print_line_t initcall_print_line(struct trace_iterator *iter) 77static enum print_line_t
78initcall_ret_print_line(struct trace_iterator *iter)
55{ 79{
56 int ret;
57 struct trace_entry *entry = iter->ent; 80 struct trace_entry *entry = iter->ent;
58 struct trace_boot *field = (struct trace_boot *)entry;
59 struct boot_trace *it = &field->initcall;
60 struct trace_seq *s = &iter->seq; 81 struct trace_seq *s = &iter->seq;
61 struct timespec calltime = ktime_to_timespec(it->calltime); 82 struct trace_boot_ret *field;
62 struct timespec rettime = ktime_to_timespec(it->rettime); 83 struct boot_trace_ret *init_ret;
63 84 u64 ts;
64 if (entry->type == TRACE_BOOT) { 85 unsigned long nsec_rem;
65 ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n", 86 int ret;
66 calltime.tv_sec, 87
67 calltime.tv_nsec, 88 trace_assign_type(field, entry);
68 it->func, it->caller); 89 init_ret = &field->boot_ret;
69 if (!ret) 90 ts = iter->ts;
70 return TRACE_TYPE_PARTIAL_LINE; 91 nsec_rem = do_div(ts, 1000000000);
71 92
72 ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s " 93 ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
73 "returned %d after %lld msecs\n", 94 "returned %d after %llu msecs\n",
74 rettime.tv_sec, 95 (unsigned long) ts,
75 rettime.tv_nsec, 96 nsec_rem,
76 it->func, it->result, it->duration); 97 init_ret->func, init_ret->result, init_ret->duration);
77 98
78 if (!ret) 99 if (!ret)
79 return TRACE_TYPE_PARTIAL_LINE; 100 return TRACE_TYPE_PARTIAL_LINE;
101 else
80 return TRACE_TYPE_HANDLED; 102 return TRACE_TYPE_HANDLED;
103}
104
105static enum print_line_t initcall_print_line(struct trace_iterator *iter)
106{
107 struct trace_entry *entry = iter->ent;
108
109 switch (entry->type) {
110 case TRACE_BOOT_CALL:
111 return initcall_call_print_line(iter);
112 case TRACE_BOOT_RET:
113 return initcall_ret_print_line(iter);
114 default:
115 return TRACE_TYPE_UNHANDLED;
81 } 116 }
82 return TRACE_TYPE_UNHANDLED;
83} 117}
84 118
85struct tracer boot_tracer __read_mostly = 119struct tracer boot_tracer __read_mostly =
86{ 120{
87 .name = "initcall", 121 .name = "initcall",
88 .init = boot_trace_init, 122 .init = boot_trace_init,
89 .reset = reset_boot_trace, 123 .reset = tracing_reset_online_cpus,
90 .ctrl_update = boot_trace_ctrl_update,
91 .print_line = initcall_print_line, 124 .print_line = initcall_print_line,
92}; 125};
93 126
94void trace_boot(struct boot_trace *it, initcall_t fn) 127void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
95{ 128{
96 struct ring_buffer_event *event; 129 struct ring_buffer_event *event;
97 struct trace_boot *entry; 130 struct trace_boot_call *entry;
98 struct trace_array_cpu *data;
99 unsigned long irq_flags; 131 unsigned long irq_flags;
100 struct trace_array *tr = boot_trace; 132 struct trace_array *tr = boot_trace;
101 133
102 if (!trace_boot_enabled) 134 if (!pre_initcalls_finished)
103 return; 135 return;
104 136
105 /* Get its name now since this function could 137 /* Get its name now since this function could
106 * disappear because it is in the .init section. 138 * disappear because it is in the .init section.
107 */ 139 */
108 sprint_symbol(it->func, (unsigned long)fn); 140 sprint_symbol(bt->func, (unsigned long)fn);
141 preempt_disable();
142
143 event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
144 &irq_flags);
145 if (!event)
146 goto out;
147 entry = ring_buffer_event_data(event);
148 tracing_generic_entry_update(&entry->ent, 0, 0);
149 entry->ent.type = TRACE_BOOT_CALL;
150 entry->boot_call = *bt;
151 ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
152
153 trace_wake_up();
154
155 out:
156 preempt_enable();
157}
158
159void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
160{
161 struct ring_buffer_event *event;
162 struct trace_boot_ret *entry;
163 unsigned long irq_flags;
164 struct trace_array *tr = boot_trace;
165
166 if (!pre_initcalls_finished)
167 return;
168
169 sprint_symbol(bt->func, (unsigned long)fn);
109 preempt_disable(); 170 preempt_disable();
110 data = tr->data[smp_processor_id()];
111 171
112 event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), 172 event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
113 &irq_flags); 173 &irq_flags);
@@ -115,8 +175,8 @@ void trace_boot(struct boot_trace *it, initcall_t fn)
115 goto out; 175 goto out;
116 entry = ring_buffer_event_data(event); 176 entry = ring_buffer_event_data(event);
117 tracing_generic_entry_update(&entry->ent, 0, 0); 177 tracing_generic_entry_update(&entry->ent, 0, 0);
118 entry->ent.type = TRACE_BOOT; 178 entry->ent.type = TRACE_BOOT_RET;
119 entry->initcall = *it; 179 entry->boot_ret = *bt;
120 ring_buffer_unlock_commit(tr->buffer, event, irq_flags); 180 ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
121 181
122 trace_wake_up(); 182 trace_wake_up();
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-02 04:34:36 -0400