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-rw-r--r--include/linux/ftrace.h3
-rw-r--r--kernel/trace/ftrace.c112
2 files changed, 102 insertions, 13 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 1b6992e994e6..9fb9a67dc9d4 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -446,7 +446,8 @@ enum {
FTRACE_ITER_PRINTALL = (1 << 2),
FTRACE_ITER_DO_PROBES = (1 << 3),
FTRACE_ITER_PROBE = (1 << 4),
- FTRACE_ITER_ENABLED = (1 << 5),
+ FTRACE_ITER_MOD = (1 << 5),
+ FTRACE_ITER_ENABLED = (1 << 6),
};
void arch_ftrace_update_code(int command);
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;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-28 04:21:50 +0000