#include "trace_output.h"
#include "trace_stat.h"
+/* Flags that do not get reset */
+#define FTRACE_NOCLEAR_FLAGS (FTRACE_FL_DISABLED | FTRACE_FL_TOUCHED)
+
#define FTRACE_INVALID_FUNCTION "__ftrace_invalid_address__"
#define FTRACE_WARN_ON(cond) \
flag ^= rec->flags & FTRACE_FL_ENABLED;
if (update) {
- rec->flags |= FTRACE_FL_ENABLED;
+ rec->flags |= FTRACE_FL_ENABLED | FTRACE_FL_TOUCHED;
if (flag & FTRACE_FL_REGS) {
if (rec->flags & FTRACE_FL_REGS)
rec->flags |= FTRACE_FL_REGS_EN;
if (update) {
/* If there's no more users, clear all flags */
if (!ftrace_rec_count(rec))
- rec->flags &= FTRACE_FL_DISABLED;
+ rec->flags &= FTRACE_NOCLEAR_FLAGS;
else
/*
* Just disable the record, but keep the ops TRAMP
struct dyn_ftrace *rec;
do_for_each_ftrace_rec(pg, rec) {
- if (FTRACE_WARN_ON_ONCE(rec->flags & ~FTRACE_FL_DISABLED))
+ if (FTRACE_WARN_ON_ONCE(rec->flags & ~FTRACE_NOCLEAR_FLAGS))
pr_warn(" %pS flags:%lx\n",
(void *)rec->ip, rec->flags);
} while_for_each_ftrace_rec();
!ftrace_lookup_ip(iter->hash, rec->ip)) ||
((iter->flags & FTRACE_ITER_ENABLED) &&
- !(rec->flags & FTRACE_FL_ENABLED))) {
+ !(rec->flags & FTRACE_FL_ENABLED)) ||
+
+ ((iter->flags & FTRACE_ITER_TOUCHED) &&
+ !(rec->flags & FTRACE_FL_TOUCHED))) {
rec = NULL;
goto retry;
return 0;
}
- if (iter->flags & FTRACE_ITER_ENABLED) {
+ if (iter->flags & (FTRACE_ITER_ENABLED | FTRACE_ITER_TOUCHED)) {
struct ftrace_ops *ops;
seq_printf(m, " (%ld)%s%s%s%s",
return 0;
}
+static int
+ftrace_touched_open(struct inode *inode, struct file *file)
+{
+ struct ftrace_iterator *iter;
+
+ /*
+ * This shows us what functions have ever been enabled
+ * (traced, direct, patched, etc). Not sure if we want lockdown
+ * to hide such critical information for an admin.
+ * Although, perhaps it can show information we don't
+ * want people to see, but if something had traced
+ * something, we probably want to know about it.
+ */
+
+ iter = __seq_open_private(file, &show_ftrace_seq_ops, sizeof(*iter));
+ if (!iter)
+ return -ENOMEM;
+
+ iter->pg = ftrace_pages_start;
+ iter->flags = FTRACE_ITER_TOUCHED;
+ iter->ops = &global_ops;
+
+ return 0;
+}
+
/**
* ftrace_regex_open - initialize function tracer filter files
* @ops: The ftrace_ops that hold the hash filters
.release = seq_release_private,
};
+static const struct file_operations ftrace_touched_fops = {
+ .open = ftrace_touched_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
static const struct file_operations ftrace_filter_fops = {
.open = ftrace_filter_open,
.read = seq_read,
trace_create_file("enabled_functions", TRACE_MODE_READ,
d_tracer, NULL, &ftrace_enabled_fops);
+ trace_create_file("touched_functions", TRACE_MODE_READ,
+ d_tracer, NULL, &ftrace_touched_fops);
+
ftrace_create_filter_files(&global_ops, d_tracer);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER