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@@ -0,0 +1,179 @@
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+/*
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+ * ring buffer based C-state tracer
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+ *
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+ * Arjan van de Ven <arjan@linux.intel.com>
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+ * Copyright (C) 2008 Intel Corporation
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+ *
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+ * Much is borrowed from trace_boot.c which is
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+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
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+ *
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/debugfs.h>
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+#include <linux/ftrace.h>
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+#include <linux/kallsyms.h>
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+#include <linux/module.h>
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+
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+#include "trace.h"
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+
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+static struct trace_array *power_trace;
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+static int __read_mostly trace_power_enabled;
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+
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+
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+static void start_power_trace(struct trace_array *tr)
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+{
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+ trace_power_enabled = 1;
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+}
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+
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+static void stop_power_trace(struct trace_array *tr)
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+{
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+ trace_power_enabled = 0;
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+}
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+
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+
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+static int power_trace_init(struct trace_array *tr)
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+{
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+ int cpu;
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+ power_trace = tr;
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+
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+ trace_power_enabled = 1;
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+
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+ for_each_cpu_mask(cpu, cpu_possible_map)
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+ tracing_reset(tr, cpu);
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+ return 0;
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+}
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+
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+static enum print_line_t power_print_line(struct trace_iterator *iter)
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+{
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+ int ret = 0;
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+ struct trace_entry *entry = iter->ent;
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+ struct trace_power *field ;
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+ struct power_trace *it;
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+ struct trace_seq *s = &iter->seq;
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+ struct timespec stamp;
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+ struct timespec duration;
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+
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+ trace_assign_type(field, entry);
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+ it = &field->state_data;
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+ stamp = ktime_to_timespec(it->stamp);
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+ duration = ktime_to_timespec(ktime_sub(it->end, it->stamp));
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+
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+ if (entry->type == TRACE_POWER) {
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+ if (it->type == POWER_CSTATE)
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+ ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n",
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+ stamp.tv_sec,
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+ stamp.tv_nsec,
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+ it->state, iter->cpu,
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+ duration.tv_sec,
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+ duration.tv_nsec);
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+ if (it->type == POWER_PSTATE)
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+ ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n",
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+ stamp.tv_sec,
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+ stamp.tv_nsec,
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+ it->state, iter->cpu);
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+ if (!ret)
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+ return TRACE_TYPE_PARTIAL_LINE;
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+ return TRACE_TYPE_HANDLED;
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+ }
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+ return TRACE_TYPE_UNHANDLED;
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+}
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+
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+static struct tracer power_tracer __read_mostly =
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+{
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+ .name = "power",
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+ .init = power_trace_init,
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+ .start = start_power_trace,
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+ .stop = stop_power_trace,
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+ .reset = stop_power_trace,
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+ .print_line = power_print_line,
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+};
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+
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+static int init_power_trace(void)
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+{
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+ return register_tracer(&power_tracer);
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+}
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+device_initcall(init_power_trace);
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+
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+void trace_power_start(struct power_trace *it, unsigned int type,
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+ unsigned int level)
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+{
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+ if (!trace_power_enabled)
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+ return;
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+
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+ memset(it, 0, sizeof(struct power_trace));
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+ it->state = level;
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+ it->type = type;
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+ it->stamp = ktime_get();
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+}
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+EXPORT_SYMBOL_GPL(trace_power_start);
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+
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+
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+void trace_power_end(struct power_trace *it)
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+{
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+ struct ring_buffer_event *event;
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+ struct trace_power *entry;
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+ struct trace_array_cpu *data;
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+ unsigned long irq_flags;
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+ struct trace_array *tr = power_trace;
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+
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+ if (!trace_power_enabled)
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+ return;
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+
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+ preempt_disable();
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+ it->end = ktime_get();
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+ data = tr->data[smp_processor_id()];
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+
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+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
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+ &irq_flags);
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+ if (!event)
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+ goto out;
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+ entry = ring_buffer_event_data(event);
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+ tracing_generic_entry_update(&entry->ent, 0, 0);
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+ entry->ent.type = TRACE_POWER;
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+ entry->state_data = *it;
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+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
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+
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+ trace_wake_up();
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+
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+ out:
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+ preempt_enable();
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+}
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+EXPORT_SYMBOL_GPL(trace_power_end);
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+
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+void trace_power_mark(struct power_trace *it, unsigned int type,
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+ unsigned int level)
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+{
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+ struct ring_buffer_event *event;
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+ struct trace_power *entry;
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+ struct trace_array_cpu *data;
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+ unsigned long irq_flags;
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+ struct trace_array *tr = power_trace;
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+
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+ if (!trace_power_enabled)
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+ return;
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+
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+ memset(it, 0, sizeof(struct power_trace));
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+ it->state = level;
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+ it->type = type;
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+ it->stamp = ktime_get();
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+ preempt_disable();
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+ it->end = it->stamp;
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+ data = tr->data[smp_processor_id()];
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+
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+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
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+ &irq_flags);
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+ if (!event)
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+ goto out;
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+ entry = ring_buffer_event_data(event);
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+ tracing_generic_entry_update(&entry->ent, 0, 0);
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+ entry->ent.type = TRACE_POWER;
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+ entry->state_data = *it;
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+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
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+
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+ trace_wake_up();
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+
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+ out:
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+ preempt_enable();
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+}
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+EXPORT_SYMBOL_GPL(trace_power_mark);
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Arjan van de Ven