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f3f47a67 AV |
1 | /* |
2 | * ring buffer based C-state tracer | |
3 | * | |
4 | * Arjan van de Ven <arjan@linux.intel.com> | |
5 | * Copyright (C) 2008 Intel Corporation | |
6 | * | |
7 | * Much is borrowed from trace_boot.c which is | |
8 | * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com> | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/debugfs.h> | |
14 | #include <linux/ftrace.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/module.h> | |
17 | ||
18 | #include "trace.h" | |
19 | ||
20 | static struct trace_array *power_trace; | |
21 | static int __read_mostly trace_power_enabled; | |
22 | ||
23 | ||
24 | static void start_power_trace(struct trace_array *tr) | |
25 | { | |
26 | trace_power_enabled = 1; | |
27 | } | |
28 | ||
29 | static void stop_power_trace(struct trace_array *tr) | |
30 | { | |
31 | trace_power_enabled = 0; | |
32 | } | |
33 | ||
34 | ||
35 | static int power_trace_init(struct trace_array *tr) | |
36 | { | |
37 | int cpu; | |
38 | power_trace = tr; | |
39 | ||
40 | trace_power_enabled = 1; | |
41 | ||
42 | for_each_cpu_mask(cpu, cpu_possible_map) | |
43 | tracing_reset(tr, cpu); | |
44 | return 0; | |
45 | } | |
46 | ||
47 | static enum print_line_t power_print_line(struct trace_iterator *iter) | |
48 | { | |
49 | int ret = 0; | |
50 | struct trace_entry *entry = iter->ent; | |
51 | struct trace_power *field ; | |
52 | struct power_trace *it; | |
53 | struct trace_seq *s = &iter->seq; | |
54 | struct timespec stamp; | |
55 | struct timespec duration; | |
56 | ||
57 | trace_assign_type(field, entry); | |
58 | it = &field->state_data; | |
59 | stamp = ktime_to_timespec(it->stamp); | |
60 | duration = ktime_to_timespec(ktime_sub(it->end, it->stamp)); | |
61 | ||
62 | if (entry->type == TRACE_POWER) { | |
63 | if (it->type == POWER_CSTATE) | |
64 | ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n", | |
65 | stamp.tv_sec, | |
66 | stamp.tv_nsec, | |
67 | it->state, iter->cpu, | |
68 | duration.tv_sec, | |
69 | duration.tv_nsec); | |
70 | if (it->type == POWER_PSTATE) | |
71 | ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n", | |
72 | stamp.tv_sec, | |
73 | stamp.tv_nsec, | |
74 | it->state, iter->cpu); | |
75 | if (!ret) | |
76 | return TRACE_TYPE_PARTIAL_LINE; | |
77 | return TRACE_TYPE_HANDLED; | |
78 | } | |
79 | return TRACE_TYPE_UNHANDLED; | |
80 | } | |
81 | ||
82 | static struct tracer power_tracer __read_mostly = | |
83 | { | |
84 | .name = "power", | |
85 | .init = power_trace_init, | |
86 | .start = start_power_trace, | |
87 | .stop = stop_power_trace, | |
88 | .reset = stop_power_trace, | |
89 | .print_line = power_print_line, | |
90 | }; | |
91 | ||
92 | static int init_power_trace(void) | |
93 | { | |
94 | return register_tracer(&power_tracer); | |
95 | } | |
96 | device_initcall(init_power_trace); | |
97 | ||
98 | void trace_power_start(struct power_trace *it, unsigned int type, | |
99 | unsigned int level) | |
100 | { | |
101 | if (!trace_power_enabled) | |
102 | return; | |
103 | ||
104 | memset(it, 0, sizeof(struct power_trace)); | |
105 | it->state = level; | |
106 | it->type = type; | |
107 | it->stamp = ktime_get(); | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(trace_power_start); | |
110 | ||
111 | ||
112 | void trace_power_end(struct power_trace *it) | |
113 | { | |
114 | struct ring_buffer_event *event; | |
115 | struct trace_power *entry; | |
116 | struct trace_array_cpu *data; | |
117 | unsigned long irq_flags; | |
118 | struct trace_array *tr = power_trace; | |
119 | ||
120 | if (!trace_power_enabled) | |
121 | return; | |
122 | ||
123 | preempt_disable(); | |
124 | it->end = ktime_get(); | |
125 | data = tr->data[smp_processor_id()]; | |
126 | ||
127 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), | |
128 | &irq_flags); | |
129 | if (!event) | |
130 | goto out; | |
131 | entry = ring_buffer_event_data(event); | |
132 | tracing_generic_entry_update(&entry->ent, 0, 0); | |
133 | entry->ent.type = TRACE_POWER; | |
134 | entry->state_data = *it; | |
135 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); | |
136 | ||
137 | trace_wake_up(); | |
138 | ||
139 | out: | |
140 | preempt_enable(); | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(trace_power_end); | |
143 | ||
144 | void trace_power_mark(struct power_trace *it, unsigned int type, | |
145 | unsigned int level) | |
146 | { | |
147 | struct ring_buffer_event *event; | |
148 | struct trace_power *entry; | |
149 | struct trace_array_cpu *data; | |
150 | unsigned long irq_flags; | |
151 | struct trace_array *tr = power_trace; | |
152 | ||
153 | if (!trace_power_enabled) | |
154 | return; | |
155 | ||
156 | memset(it, 0, sizeof(struct power_trace)); | |
157 | it->state = level; | |
158 | it->type = type; | |
159 | it->stamp = ktime_get(); | |
160 | preempt_disable(); | |
161 | it->end = it->stamp; | |
162 | data = tr->data[smp_processor_id()]; | |
163 | ||
164 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), | |
165 | &irq_flags); | |
166 | if (!event) | |
167 | goto out; | |
168 | entry = ring_buffer_event_data(event); | |
169 | tracing_generic_entry_update(&entry->ent, 0, 0); | |
170 | entry->ent.type = TRACE_POWER; | |
171 | entry->state_data = *it; | |
172 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); | |
173 | ||
174 | trace_wake_up(); | |
175 | ||
176 | out: | |
177 | preempt_enable(); | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(trace_power_mark); |