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arch
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linux
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trace_boot.c
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trace_boot.c
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/* * ring buffer based initcalls tracer * * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com> * */ #include <linux/init.h> #include <linux/debugfs.h> #include <linux/ftrace.h> #include <linux/kallsyms.h> #include "trace.h" #include "trace_output.h" static struct trace_array *boot_trace; static bool pre_initcalls_finished; /* Tells the boot tracer that the pre_smp_initcalls are finished. * So we are ready . * It doesn't enable sched events tracing however. * You have to call enable_boot_trace to do so. */ void start_boot_trace(void) { pre_initcalls_finished = true; } void enable_boot_trace(void) { if (boot_trace && pre_initcalls_finished) tracing_start_sched_switch_record(); } void disable_boot_trace(void) { if (boot_trace && pre_initcalls_finished) tracing_stop_sched_switch_record(); } static int boot_trace_init(struct trace_array *tr) { int cpu; boot_trace = tr; if (!tr) return 0; for_each_cpu(cpu, cpu_possible_mask) tracing_reset(tr, cpu); tracing_sched_switch_assign_trace(tr); return 0; } static enum print_line_t initcall_call_print_line(struct trace_iterator *iter) { struct trace_entry *entry = iter->ent; struct trace_seq *s = &iter->seq; struct trace_boot_call *field; struct boot_trace_call *call; u64 ts; unsigned long nsec_rem; int ret; trace_assign_type(field, entry); call = &field->boot_call; ts = iter->ts; nsec_rem = do_div(ts, 1000000000); ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n", (unsigned long)ts, nsec_rem, call->func, call->caller); if (!ret) return TRACE_TYPE_PARTIAL_LINE; else return TRACE_TYPE_HANDLED; } static enum print_line_t initcall_ret_print_line(struct trace_iterator *iter) { struct trace_entry *entry = iter->ent; struct trace_seq *s = &iter->seq; struct trace_boot_ret *field; struct boot_trace_ret *init_ret; u64 ts; unsigned long nsec_rem; int ret; trace_assign_type(field, entry); init_ret = &field->boot_ret; ts = iter->ts; nsec_rem = do_div(ts, 1000000000); ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s " "returned %d after %llu msecs\n", (unsigned long) ts, nsec_rem, init_ret->func, init_ret->result, init_ret->duration); if (!ret) return TRACE_TYPE_PARTIAL_LINE; else return TRACE_TYPE_HANDLED; } static enum print_line_t initcall_print_line(struct trace_iterator *iter) { struct trace_entry *entry = iter->ent; switch (entry->type) { case TRACE_BOOT_CALL: return initcall_call_print_line(iter); case TRACE_BOOT_RET: return initcall_ret_print_line(iter); default: return TRACE_TYPE_UNHANDLED; } } struct tracer boot_tracer __read_mostly = { .name = "initcall", .init = boot_trace_init, .reset = tracing_reset_online_cpus, .print_line = initcall_print_line, }; void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) { struct ring_buffer_event *event; struct trace_boot_call *entry; struct trace_array *tr = boot_trace; if (!tr || !pre_initcalls_finished) return; /* Get its name now since this function could * disappear because it is in the .init section. */ sprint_symbol(bt->func, (unsigned long)fn); preempt_disable(); event = trace_buffer_lock_reserve(tr, TRACE_BOOT_CALL, sizeof(*entry), 0, 0); if (!event) goto out; entry = ring_buffer_event_data(event); entry->boot_call = *bt; trace_buffer_unlock_commit(tr, event, 0, 0); out: preempt_enable(); } void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) { struct ring_buffer_event *event; struct trace_boot_ret *entry; struct trace_array *tr = boot_trace; if (!tr || !pre_initcalls_finished) return; sprint_symbol(bt->func, (unsigned long)fn); preempt_disable(); event = trace_buffer_lock_reserve(tr, TRACE_BOOT_RET, sizeof(*entry), 0, 0); if (!event) goto out; entry = ring_buffer_event_data(event); entry->boot_ret = *bt; trace_buffer_unlock_commit(tr, event, 0, 0); out: preempt_enable(); }
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