diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ftrace.c | 112 |
1 files changed, 100 insertions, 12 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 1867edec6269..bfdbce78064b 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -3112,6 +3112,7 @@ ftrace_allocate_pages(unsigned long num_to_init) struct ftrace_iterator { loff_t pos; loff_t func_pos; + loff_t mod_pos; struct ftrace_page *pg; struct dyn_ftrace *func; struct ftrace_func_probe *probe; @@ -3119,6 +3120,8 @@ struct ftrace_iterator { struct trace_parser parser; struct ftrace_hash *hash; struct ftrace_ops *ops; + struct trace_array *tr; + struct list_head *mod_list; int pidx; int idx; unsigned flags; @@ -3203,13 +3206,13 @@ static void *t_probe_start(struct seq_file *m, loff_t *pos) if (!(iter->flags & FTRACE_ITER_DO_PROBES)) return NULL; - if (iter->func_pos > *pos) + if (iter->mod_pos > *pos) return NULL; iter->probe = NULL; iter->probe_entry = NULL; iter->pidx = 0; - for (l = 0; l <= (*pos - iter->func_pos); ) { + for (l = 0; l <= (*pos - iter->mod_pos); ) { p = t_probe_next(m, &l); if (!p) break; @@ -3248,6 +3251,82 @@ t_probe_show(struct seq_file *m, struct ftrace_iterator *iter) } static void * +t_mod_next(struct seq_file *m, loff_t *pos) +{ + struct ftrace_iterator *iter = m->private; + struct trace_array *tr = iter->tr; + + (*pos)++; + iter->pos = *pos; + + iter->mod_list = iter->mod_list->next; + + if (iter->mod_list == &tr->mod_trace || + iter->mod_list == &tr->mod_notrace) { + iter->flags &= ~FTRACE_ITER_MOD; + return NULL; + } + + iter->mod_pos = *pos; + + return iter; +} + +static void *t_mod_start(struct seq_file *m, loff_t *pos) +{ + struct ftrace_iterator *iter = m->private; + void *p = NULL; + loff_t l; + + if (iter->func_pos > *pos) + return NULL; + + iter->mod_pos = iter->func_pos; + + /* probes are only available if tr is set */ + if (!iter->tr) + return NULL; + + for (l = 0; l <= (*pos - iter->func_pos); ) { + p = t_mod_next(m, &l); + if (!p) + break; + } + if (!p) { + iter->flags &= ~FTRACE_ITER_MOD; + return t_probe_start(m, pos); + } + + /* Only set this if we have an item */ + iter->flags |= FTRACE_ITER_MOD; + + return iter; +} + +static int +t_mod_show(struct seq_file *m, struct ftrace_iterator *iter) +{ + struct ftrace_mod_load *ftrace_mod; + struct trace_array *tr = iter->tr; + + if (WARN_ON_ONCE(!iter->mod_list) || + iter->mod_list == &tr->mod_trace || + iter->mod_list == &tr->mod_notrace) + return -EIO; + + ftrace_mod = list_entry(iter->mod_list, struct ftrace_mod_load, list); + + if (ftrace_mod->func) + seq_printf(m, "%s", ftrace_mod->func); + else + seq_putc(m, '*'); + + seq_printf(m, ":mod:%s\n", ftrace_mod->module); + + return 0; +} + +static void * t_func_next(struct seq_file *m, loff_t *pos) { struct ftrace_iterator *iter = m->private; @@ -3288,7 +3367,7 @@ static void * t_next(struct seq_file *m, void *v, loff_t *pos) { struct ftrace_iterator *iter = m->private; - loff_t l = *pos; /* t_hash_start() must use original pos */ + loff_t l = *pos; /* t_probe_start() must use original pos */ void *ret; if (unlikely(ftrace_disabled)) @@ -3297,16 +3376,19 @@ t_next(struct seq_file *m, void *v, loff_t *pos) if (iter->flags & FTRACE_ITER_PROBE) return t_probe_next(m, pos); + if (iter->flags & FTRACE_ITER_MOD) + return t_mod_next(m, pos); + if (iter->flags & FTRACE_ITER_PRINTALL) { /* next must increment pos, and t_probe_start does not */ (*pos)++; - return t_probe_start(m, &l); + return t_mod_start(m, &l); } ret = t_func_next(m, pos); if (!ret) - return t_probe_start(m, &l); + return t_mod_start(m, &l); return ret; } @@ -3315,7 +3397,7 @@ static void reset_iter_read(struct ftrace_iterator *iter) { iter->pos = 0; iter->func_pos = 0; - iter->flags &= ~(FTRACE_ITER_PRINTALL | FTRACE_ITER_PROBE); + iter->flags &= ~(FTRACE_ITER_PRINTALL | FTRACE_ITER_PROBE | FTRACE_ITER_MOD); } static void *t_start(struct seq_file *m, loff_t *pos) @@ -3344,15 +3426,15 @@ static void *t_start(struct seq_file *m, loff_t *pos) ftrace_hash_empty(iter->hash)) { iter->func_pos = 1; /* Account for the message */ if (*pos > 0) - return t_probe_start(m, pos); + return t_mod_start(m, pos); iter->flags |= FTRACE_ITER_PRINTALL; /* reset in case of seek/pread */ iter->flags &= ~FTRACE_ITER_PROBE; return iter; } - if (iter->flags & FTRACE_ITER_PROBE) - return t_probe_start(m, pos); + if (iter->flags & FTRACE_ITER_MOD) + return t_mod_start(m, pos); /* * Unfortunately, we need to restart at ftrace_pages_start @@ -3368,7 +3450,7 @@ static void *t_start(struct seq_file *m, loff_t *pos) } if (!p) - return t_probe_start(m, pos); + return t_mod_start(m, pos); return iter; } @@ -3402,6 +3484,9 @@ static int t_show(struct seq_file *m, void *v) if (iter->flags & FTRACE_ITER_PROBE) return t_probe_show(m, iter); + if (iter->flags & FTRACE_ITER_MOD) + return t_mod_show(m, iter); + if (iter->flags & FTRACE_ITER_PRINTALL) { if (iter->flags & FTRACE_ITER_NOTRACE) seq_puts(m, "#### no functions disabled ####\n"); @@ -3528,17 +3613,20 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag, iter->ops = ops; iter->flags = flag; + iter->tr = tr; mutex_lock(&ops->func_hash->regex_lock); if (flag & FTRACE_ITER_NOTRACE) { hash = ops->func_hash->notrace_hash; - mod_head = tr ? &tr->mod_trace : NULL; + mod_head = tr ? &tr->mod_notrace : NULL; } else { hash = ops->func_hash->filter_hash; - mod_head = tr ? &tr->mod_notrace : NULL; + mod_head = tr ? &tr->mod_trace : NULL; } + iter->mod_list = mod_head; + if (file->f_mode & FMODE_WRITE) { const int size_bits = FTRACE_HASH_DEFAULT_BITS; |