#include "trace_stat.h"
#define FTRACE_WARN_ON(cond) \
- do { \
- if (WARN_ON(cond)) \
+ ({ \
+ int ___r = cond; \
+ if (WARN_ON(___r)) \
ftrace_kill(); \
- } while (0)
+ ___r; \
+ })
#define FTRACE_WARN_ON_ONCE(cond) \
- do { \
- if (WARN_ON_ONCE(cond)) \
+ ({ \
+ int ___r = cond; \
+ if (WARN_ON_ONCE(___r)) \
ftrace_kill(); \
- } while (0)
+ ___r; \
+ })
/* hash bits for specific function selection */
#define FTRACE_HASH_BITS 7
}
#endif
+static void update_ftrace_function(void)
+{
+ ftrace_func_t func;
+
+ /*
+ * If there's only one function registered, then call that
+ * function directly. Otherwise, we need to iterate over the
+ * registered callers.
+ */
+ if (ftrace_list == &ftrace_list_end ||
+ ftrace_list->next == &ftrace_list_end)
+ func = ftrace_list->func;
+ else
+ func = ftrace_list_func;
+
+ /* If we filter on pids, update to use the pid function */
+ if (!list_empty(&ftrace_pids)) {
+ set_ftrace_pid_function(func);
+ func = ftrace_pid_func;
+ }
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+ ftrace_trace_function = func;
+#else
+ __ftrace_trace_function = func;
+ ftrace_trace_function = ftrace_test_stop_func;
+#endif
+}
+
static int __register_ftrace_function(struct ftrace_ops *ops)
{
ops->next = ftrace_list;
*/
rcu_assign_pointer(ftrace_list, ops);
- if (ftrace_enabled) {
- ftrace_func_t func;
-
- if (ops->next == &ftrace_list_end)
- func = ops->func;
- else
- func = ftrace_list_func;
-
- if (!list_empty(&ftrace_pids)) {
- set_ftrace_pid_function(func);
- func = ftrace_pid_func;
- }
-
- /*
- * For one func, simply call it directly.
- * For more than one func, call the chain.
- */
-#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
- ftrace_trace_function = func;
-#else
- __ftrace_trace_function = func;
- ftrace_trace_function = ftrace_test_stop_func;
-#endif
- }
+ if (ftrace_enabled)
+ update_ftrace_function();
return 0;
}
*p = (*p)->next;
- if (ftrace_enabled) {
- /* If we only have one func left, then call that directly */
- if (ftrace_list->next == &ftrace_list_end) {
- ftrace_func_t func = ftrace_list->func;
-
- if (!list_empty(&ftrace_pids)) {
- set_ftrace_pid_function(func);
- func = ftrace_pid_func;
- }
-#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
- ftrace_trace_function = func;
-#else
- __ftrace_trace_function = func;
-#endif
- }
- }
+ if (ftrace_enabled)
+ update_ftrace_function();
return 0;
}
static void ftrace_update_pid_func(void)
{
- ftrace_func_t func;
-
+ /* Only do something if we are tracing something */
if (ftrace_trace_function == ftrace_stub)
return;
-#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
- func = ftrace_trace_function;
-#else
- func = __ftrace_trace_function;
-#endif
-
- if (!list_empty(&ftrace_pids)) {
- set_ftrace_pid_function(func);
- func = ftrace_pid_func;
- } else {
- if (func == ftrace_pid_func)
- func = ftrace_pid_function;
- }
-
-#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
- ftrace_trace_function = func;
-#else
- __ftrace_trace_function = func;
-#endif
+ update_ftrace_function();
}
#ifdef CONFIG_FUNCTION_PROFILER
struct ftrace_page *pg;
int failed;
+ if (unlikely(ftrace_disabled))
+ return;
+
do_for_each_ftrace_rec(pg, rec) {
- /*
- * Skip over free records, records that have
- * failed and not converted.
- */
- if (rec->flags & FTRACE_FL_FREE ||
- rec->flags & FTRACE_FL_FAILED ||
- !(rec->flags & FTRACE_FL_CONVERTED))
+ /* Skip over free records */
+ if (rec->flags & FTRACE_FL_FREE)
continue;
failed = __ftrace_replace_code(rec, enable);
if (failed) {
- rec->flags |= FTRACE_FL_FAILED;
ftrace_bug(failed, rec->ip);
/* Stop processing */
return;
ip = rec->ip;
+ if (unlikely(ftrace_disabled))
+ return 0;
+
ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
if (ret) {
ftrace_bug(ret, ip);
- rec->flags |= FTRACE_FL_FAILED;
return 0;
}
return 1;
*/
if (!ftrace_code_disable(mod, p)) {
ftrace_free_rec(p);
- continue;
+ /* Game over */
+ break;
}
- p->flags |= FTRACE_FL_CONVERTED;
ftrace_update_cnt++;
/*
enum {
FTRACE_ITER_FILTER = (1 << 0),
FTRACE_ITER_NOTRACE = (1 << 1),
- FTRACE_ITER_FAILURES = (1 << 2),
- FTRACE_ITER_PRINTALL = (1 << 3),
- FTRACE_ITER_HASH = (1 << 4),
+ FTRACE_ITER_PRINTALL = (1 << 2),
+ FTRACE_ITER_HASH = (1 << 3),
};
#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
struct ftrace_iterator *iter = m->private;
struct dyn_ftrace *rec = NULL;
+ if (unlikely(ftrace_disabled))
+ return NULL;
+
if (iter->flags & FTRACE_ITER_HASH)
return t_hash_next(m, pos);
rec = &iter->pg->records[iter->idx++];
if ((rec->flags & FTRACE_FL_FREE) ||
- (!(iter->flags & FTRACE_ITER_FAILURES) &&
- (rec->flags & FTRACE_FL_FAILED)) ||
-
- ((iter->flags & FTRACE_ITER_FAILURES) &&
- !(rec->flags & FTRACE_FL_FAILED)) ||
-
((iter->flags & FTRACE_ITER_FILTER) &&
!(rec->flags & FTRACE_FL_FILTER)) ||
loff_t l;
mutex_lock(&ftrace_lock);
+
+ if (unlikely(ftrace_disabled))
+ return NULL;
+
/*
* If an lseek was done, then reset and start from beginning.
*/
return ret;
}
-static int
-ftrace_failures_open(struct inode *inode, struct file *file)
-{
- int ret;
- struct seq_file *m;
- struct ftrace_iterator *iter;
-
- ret = ftrace_avail_open(inode, file);
- if (!ret) {
- m = file->private_data;
- iter = m->private;
- iter->flags = FTRACE_ITER_FAILURES;
- }
-
- return ret;
-}
-
-
static void ftrace_filter_reset(int enable)
{
struct ftrace_page *pg;
if (enable)
ftrace_filtered = 0;
do_for_each_ftrace_rec(pg, rec) {
- if (rec->flags & FTRACE_FL_FAILED)
- continue;
rec->flags &= ~type;
} while_for_each_ftrace_rec();
mutex_unlock(&ftrace_lock);
return matched;
}
+static void
+update_record(struct dyn_ftrace *rec, unsigned long flag, int not)
+{
+ if (not)
+ rec->flags &= ~flag;
+ else
+ rec->flags |= flag;
+}
+
static int
-ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type)
+ftrace_match_record(struct dyn_ftrace *rec, char *mod,
+ char *regex, int len, int type)
{
char str[KSYM_SYMBOL_LEN];
+ char *modname;
+
+ kallsyms_lookup(rec->ip, NULL, NULL, &modname, str);
+
+ if (mod) {
+ /* module lookup requires matching the module */
+ if (!modname || strcmp(modname, mod))
+ return 0;
+
+ /* blank search means to match all funcs in the mod */
+ if (!len)
+ return 1;
+ }
- kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
return ftrace_match(str, regex, len, type);
}
-static int ftrace_match_records(char *buff, int len, int enable)
+static int match_records(char *buff, int len, char *mod, int enable, int not)
{
- unsigned int search_len;
+ unsigned search_len = 0;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
+ int type = MATCH_FULL;
+ char *search = buff;
unsigned long flag;
- char *search;
- int type;
- int not;
int found = 0;
- flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
- type = filter_parse_regex(buff, len, &search, ¬);
+ if (len) {
+ type = filter_parse_regex(buff, len, &search, ¬);
+ search_len = strlen(search);
+ }
- search_len = strlen(search);
+ flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
mutex_lock(&ftrace_lock);
- do_for_each_ftrace_rec(pg, rec) {
- if (rec->flags & FTRACE_FL_FAILED)
- continue;
+ if (unlikely(ftrace_disabled))
+ goto out_unlock;
- if (ftrace_match_record(rec, search, search_len, type)) {
- if (not)
- rec->flags &= ~flag;
- else
- rec->flags |= flag;
+ do_for_each_ftrace_rec(pg, rec) {
+
+ if (ftrace_match_record(rec, mod, search, search_len, type)) {
+ update_record(rec, flag, not);
found = 1;
}
/*
*/
if (enable && (rec->flags & FTRACE_FL_FILTER))
ftrace_filtered = 1;
+
} while_for_each_ftrace_rec();
+ out_unlock:
mutex_unlock(&ftrace_lock);
return found;
}
static int
-ftrace_match_module_record(struct dyn_ftrace *rec, char *mod,
- char *regex, int len, int type)
+ftrace_match_records(char *buff, int len, int enable)
{
- char str[KSYM_SYMBOL_LEN];
- char *modname;
-
- kallsyms_lookup(rec->ip, NULL, NULL, &modname, str);
-
- if (!modname || strcmp(modname, mod))
- return 0;
-
- /* blank search means to match all funcs in the mod */
- if (len)
- return ftrace_match(str, regex, len, type);
- else
- return 1;
+ return match_records(buff, len, NULL, enable, 0);
}
static int ftrace_match_module_records(char *buff, char *mod, int enable)
{
- unsigned search_len = 0;
- struct ftrace_page *pg;
- struct dyn_ftrace *rec;
- int type = MATCH_FULL;
- char *search = buff;
- unsigned long flag;
int not = 0;
- int found = 0;
-
- flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
/* blank or '*' mean the same */
if (strcmp(buff, "*") == 0)
not = 1;
}
- if (strlen(buff)) {
- type = filter_parse_regex(buff, strlen(buff), &search, ¬);
- search_len = strlen(search);
- }
-
- mutex_lock(&ftrace_lock);
- do_for_each_ftrace_rec(pg, rec) {
-
- if (rec->flags & FTRACE_FL_FAILED)
- continue;
-
- if (ftrace_match_module_record(rec, mod,
- search, search_len, type)) {
- if (not)
- rec->flags &= ~flag;
- else
- rec->flags |= flag;
- found = 1;
- }
- if (enable && (rec->flags & FTRACE_FL_FILTER))
- ftrace_filtered = 1;
-
- } while_for_each_ftrace_rec();
- mutex_unlock(&ftrace_lock);
-
- return found;
+ return match_records(buff, strlen(buff), mod, enable, not);
}
/*
return -EINVAL;
mutex_lock(&ftrace_lock);
- do_for_each_ftrace_rec(pg, rec) {
- if (rec->flags & FTRACE_FL_FAILED)
- continue;
+ if (unlikely(ftrace_disabled))
+ goto out_unlock;
- if (!ftrace_match_record(rec, search, len, type))
+ do_for_each_ftrace_rec(pg, rec) {
+
+ if (!ftrace_match_record(rec, NULL, search, len, type))
continue;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
mutex_lock(&ftrace_regex_lock);
+ ret = -ENODEV;
+ if (unlikely(ftrace_disabled))
+ goto out_unlock;
+
if (file->f_mode & FMODE_READ) {
struct seq_file *m = file->private_data;
iter = m->private;
.release = seq_release_private,
};
-static const struct file_operations ftrace_failures_fops = {
- .open = ftrace_failures_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,
bool exists;
int i;
- if (ftrace_disabled)
- return -ENODEV;
-
/* decode regex */
type = filter_parse_regex(buffer, strlen(buffer), &search, ¬);
if (!not && *idx >= FTRACE_GRAPH_MAX_FUNCS)
search_len = strlen(search);
mutex_lock(&ftrace_lock);
+
+ if (unlikely(ftrace_disabled)) {
+ mutex_unlock(&ftrace_lock);
+ return -ENODEV;
+ }
+
do_for_each_ftrace_rec(pg, rec) {
- if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
+ if (rec->flags & FTRACE_FL_FREE)
continue;
- if (ftrace_match_record(rec, search, search_len, type)) {
+ if (ftrace_match_record(rec, NULL, search, search_len, type)) {
/* if it is in the array */
exists = false;
for (i = 0; i < *idx; i++) {
trace_create_file("available_filter_functions", 0444,
d_tracer, NULL, &ftrace_avail_fops);
- trace_create_file("failures", 0444,
- d_tracer, NULL, &ftrace_failures_fops);
-
trace_create_file("set_ftrace_filter", 0644, d_tracer,
NULL, &ftrace_filter_fops);
{
unsigned long *p;
unsigned long addr;
- unsigned long flags;
mutex_lock(&ftrace_lock);
p = start;
ftrace_record_ip(addr);
}
- /* disable interrupts to prevent kstop machine */
- local_irq_save(flags);
ftrace_update_code(mod);
- local_irq_restore(flags);
mutex_unlock(&ftrace_lock);
return 0;
struct dyn_ftrace *rec;
struct ftrace_page *pg;
+ mutex_lock(&ftrace_lock);
+
if (ftrace_disabled)
- return;
+ goto out_unlock;
- mutex_lock(&ftrace_lock);
do_for_each_ftrace_rec(pg, rec) {
if (within_module_core(rec->ip, mod)) {
/*
ftrace_free_rec(rec);
}
} while_for_each_ftrace_rec();
+ out_unlock:
mutex_unlock(&ftrace_lock);
}
*/
int register_ftrace_function(struct ftrace_ops *ops)
{
- int ret;
-
- if (unlikely(ftrace_disabled))
- return -1;
+ int ret = -1;
mutex_lock(&ftrace_lock);
+ if (unlikely(ftrace_disabled))
+ goto out_unlock;
+
ret = __register_ftrace_function(ops);
ftrace_startup(0);
+ out_unlock:
mutex_unlock(&ftrace_lock);
return ret;
}
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
- int ret;
-
- if (unlikely(ftrace_disabled))
- return -ENODEV;
+ int ret = -ENODEV;
mutex_lock(&ftrace_lock);
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (unlikely(ftrace_disabled))
+ goto out;
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (ret || !write || (last_ftrace_enabled == !!ftrace_enabled))
goto out;
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / blobdiff