diff options
Diffstat (limited to 'kernel/trace/trace_hw_branches.c')
| -rw-r--r-- | kernel/trace/trace_hw_branches.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c deleted file mode 100644 index 649df22d435..00000000000 --- a/kernel/trace/trace_hw_branches.c +++ /dev/null @@ -1,195 +0,0 @@ -/* - * h/w branch tracer for x86 based on bts - * - * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com> - * - */ - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/debugfs.h> -#include <linux/ftrace.h> -#include <linux/kallsyms.h> - -#include <asm/ds.h> - -#include "trace.h" - - -#define SIZEOF_BTS (1 << 13) - -static DEFINE_PER_CPU(struct bts_tracer *, tracer); -static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer); - -#define this_tracer per_cpu(tracer, smp_processor_id()) -#define this_buffer per_cpu(buffer, smp_processor_id()) - - -static void bts_trace_start_cpu(void *arg) -{ - if (this_tracer) - ds_release_bts(this_tracer); - - this_tracer = - ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS, - /* ovfl = */ NULL, /* th = */ (size_t)-1, - BTS_KERNEL); - if (IS_ERR(this_tracer)) { - this_tracer = NULL; - return; - } -} - -static void bts_trace_start(struct trace_array *tr) -{ - int cpu; - - tracing_reset_online_cpus(tr); - - for_each_cpu(cpu, cpu_possible_mask) - smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1); -} - -static void bts_trace_stop_cpu(void *arg) -{ - if (this_tracer) { - ds_release_bts(this_tracer); - this_tracer = NULL; - } -} - -static void bts_trace_stop(struct trace_array *tr) -{ - int cpu; - - for_each_cpu(cpu, cpu_possible_mask) - smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1); -} - -static int bts_trace_init(struct trace_array *tr) -{ - tracing_reset_online_cpus(tr); - bts_trace_start(tr); - - return 0; -} - -static void bts_trace_print_header(struct seq_file *m) -{ - seq_puts(m, - "# CPU# FROM TO FUNCTION\n"); - seq_puts(m, - "# | | | |\n"); -} - -static enum print_line_t bts_trace_print_line(struct trace_iterator *iter) -{ - struct trace_entry *entry = iter->ent; - struct trace_seq *seq = &iter->seq; - struct hw_branch_entry *it; - - trace_assign_type(it, entry); - - if (entry->type == TRACE_HW_BRANCHES) { - if (trace_seq_printf(seq, "%4d ", entry->cpu) && - trace_seq_printf(seq, "0x%016llx -> 0x%016llx ", - it->from, it->to) && - (!it->from || - seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) && - trace_seq_printf(seq, "\n")) - return TRACE_TYPE_HANDLED; - return TRACE_TYPE_PARTIAL_LINE;; - } - return TRACE_TYPE_UNHANDLED; -} - -void trace_hw_branch(struct trace_array *tr, u64 from, u64 to) -{ - struct ring_buffer_event *event; - struct hw_branch_entry *entry; - unsigned long irq; - - event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq); - if (!event) - return; - entry = ring_buffer_event_data(event); - tracing_generic_entry_update(&entry->ent, 0, from); - entry->ent.type = TRACE_HW_BRANCHES; - entry->ent.cpu = smp_processor_id(); - entry->from = from; - entry->to = to; - ring_buffer_unlock_commit(tr->buffer, event, irq); -} - -static void trace_bts_at(struct trace_array *tr, - const struct bts_trace *trace, void *at) -{ - struct bts_struct bts; - int err = 0; - - WARN_ON_ONCE(!trace->read); - if (!trace->read) - return; - - err = trace->read(this_tracer, at, &bts); - if (err < 0) - return; - - switch (bts.qualifier) { - case BTS_BRANCH: - trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to); - break; - } -} - -static void trace_bts_cpu(void *arg) -{ - struct trace_array *tr = (struct trace_array *) arg; - const struct bts_trace *trace; - unsigned char *at; - - if (!this_tracer) - return; - - ds_suspend_bts(this_tracer); - trace = ds_read_bts(this_tracer); - if (!trace) - goto out; - - for (at = trace->ds.top; (void *)at < trace->ds.end; - at += trace->ds.size) - trace_bts_at(tr, trace, at); - - for (at = trace->ds.begin; (void *)at < trace->ds.top; - at += trace->ds.size) - trace_bts_at(tr, trace, at); - -out: - ds_resume_bts(this_tracer); -} - -static void trace_bts_prepare(struct trace_iterator *iter) -{ - int cpu; - - for_each_cpu(cpu, cpu_possible_mask) - smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1); -} - -struct tracer bts_tracer __read_mostly = -{ - .name = "hw-branch-tracer", - .init = bts_trace_init, - .reset = bts_trace_stop, - .print_header = bts_trace_print_header, - .print_line = bts_trace_print_line, - .start = bts_trace_start, - .stop = bts_trace_stop, - .open = trace_bts_prepare -}; - -__init static int init_bts_trace(void) -{ - return register_tracer(&bts_tracer); -} -device_initcall(init_bts_trace); |