{
ftrace_func_t func;
- mutex_lock(&ftrace_lock);
-
if (ftrace_trace_function == ftrace_stub)
- goto out;
+ return;
func = ftrace_trace_function;
#else
__ftrace_trace_function = func;
#endif
-
- out:
- mutex_unlock(&ftrace_lock);
}
/* set when tracing only a pid */
static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly;
-struct ftrace_func_hook {
+struct ftrace_func_probe {
struct hlist_node node;
- struct ftrace_hook_ops *ops;
+ struct ftrace_probe_ops *ops;
unsigned long flags;
unsigned long ip;
void *data;
static int
__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
{
- unsigned long ip, fl;
unsigned long ftrace_addr;
+ unsigned long ip, fl;
ftrace_addr = (unsigned long)FTRACE_ADDR;
static void ftrace_replace_code(int enable)
{
- int failed;
struct dyn_ftrace *rec;
struct ftrace_page *pg;
+ int failed;
do_for_each_ftrace_rec(pg, rec) {
/*
if ((system_state == SYSTEM_BOOTING) ||
!core_kernel_text(rec->ip)) {
ftrace_free_rec(rec);
- } else
+ } else {
ftrace_bug(failed, rec->ip);
+ /* Stop processing */
+ return;
+ }
}
} while_for_each_ftrace_rec();
}
return 1;
}
+/*
+ * archs can override this function if they must do something
+ * before the modifying code is performed.
+ */
+int __weak ftrace_arch_code_modify_prepare(void)
+{
+ return 0;
+}
+
+/*
+ * archs can override this function if they must do something
+ * after the modifying code is performed.
+ */
+int __weak ftrace_arch_code_modify_post_process(void)
+{
+ return 0;
+}
+
static int __ftrace_modify_code(void *data)
{
int *command = data;
static void ftrace_run_update_code(int command)
{
+ int ret;
+
+ ret = ftrace_arch_code_modify_prepare();
+ FTRACE_WARN_ON(ret);
+ if (ret)
+ return;
+
stop_machine(__ftrace_modify_code, &command, NULL);
+
+ ret = ftrace_arch_code_modify_post_process();
+ FTRACE_WARN_ON(ret);
}
static ftrace_func_t saved_ftrace_func;
static int t_hash_show(struct seq_file *m, void *v)
{
- struct ftrace_func_hook *rec;
+ struct ftrace_func_probe *rec;
struct hlist_node *hnd = v;
char str[KSYM_SYMBOL_LEN];
- rec = hlist_entry(hnd, struct ftrace_func_hook, node);
+ rec = hlist_entry(hnd, struct ftrace_func_probe, node);
if (rec->ops->print)
return rec->ops->print(m, rec->ip, rec->ops, rec->data);
static void ftrace_match_records(char *buff, int len, int enable)
{
- char *search;
+ unsigned int search_len;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
+ unsigned long flag;
+ char *search;
int type;
- unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
- unsigned search_len;
int not;
+ flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
type = ftrace_setup_glob(buff, len, &search, ¬);
search_len = strlen(search);
static void ftrace_match_module_records(char *buff, char *mod, int enable)
{
- char *search = buff;
+ unsigned search_len = 0;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
int type = MATCH_FULL;
- unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
- unsigned search_len = 0;
+ char *search = buff;
+ unsigned long flag;
int not = 0;
+ flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
+
/* blank or '*' mean the same */
if (strcmp(buff, "*") == 0)
buff[0] = 0;
device_initcall(ftrace_mod_cmd_init);
static void
-function_trace_hook_call(unsigned long ip, unsigned long parent_ip)
+function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
{
- struct ftrace_func_hook *entry;
+ struct ftrace_func_probe *entry;
struct hlist_head *hhd;
struct hlist_node *n;
unsigned long key;
ftrace_preempt_enable(resched);
}
-static struct ftrace_ops trace_hook_ops __read_mostly =
+static struct ftrace_ops trace_probe_ops __read_mostly =
{
- .func = function_trace_hook_call,
+ .func = function_trace_probe_call,
};
-static int ftrace_hook_registered;
+static int ftrace_probe_registered;
-static void __enable_ftrace_function_hook(void)
+static void __enable_ftrace_function_probe(void)
{
int i;
- if (ftrace_hook_registered)
+ if (ftrace_probe_registered)
return;
for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) {
if (i == FTRACE_FUNC_HASHSIZE)
return;
- __register_ftrace_function(&trace_hook_ops);
+ __register_ftrace_function(&trace_probe_ops);
ftrace_startup(0);
- ftrace_hook_registered = 1;
+ ftrace_probe_registered = 1;
}
-static void __disable_ftrace_function_hook(void)
+static void __disable_ftrace_function_probe(void)
{
int i;
- if (!ftrace_hook_registered)
+ if (!ftrace_probe_registered)
return;
for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) {
}
/* no more funcs left */
- __unregister_ftrace_function(&trace_hook_ops);
+ __unregister_ftrace_function(&trace_probe_ops);
ftrace_shutdown(0);
- ftrace_hook_registered = 0;
+ ftrace_probe_registered = 0;
}
static void ftrace_free_entry_rcu(struct rcu_head *rhp)
{
- struct ftrace_func_hook *entry =
- container_of(rhp, struct ftrace_func_hook, rcu);
+ struct ftrace_func_probe *entry =
+ container_of(rhp, struct ftrace_func_probe, rcu);
if (entry->ops->free)
entry->ops->free(&entry->data);
int
-register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops,
+register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
void *data)
{
- struct ftrace_func_hook *entry;
+ struct ftrace_func_probe *entry;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
- unsigned long key;
int type, len, not;
+ unsigned long key;
int count = 0;
char *search;
type = ftrace_setup_glob(glob, strlen(glob), &search, ¬);
len = strlen(search);
- /* we do not support '!' for function hooks */
+ /* we do not support '!' for function probes */
if (WARN_ON(not))
return -EINVAL;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
- /* If we did not hook to any, then return error */
+ /* If we did not process any, then return error */
if (!count)
count = -ENOMEM;
goto out_unlock;
hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]);
} while_for_each_ftrace_rec();
- __enable_ftrace_function_hook();
+ __enable_ftrace_function_probe();
out_unlock:
mutex_unlock(&ftrace_lock);
}
enum {
- HOOK_TEST_FUNC = 1,
- HOOK_TEST_DATA = 2
+ PROBE_TEST_FUNC = 1,
+ PROBE_TEST_DATA = 2
};
static void
-__unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops,
+__unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
void *data, int flags)
{
- struct ftrace_func_hook *entry;
+ struct ftrace_func_probe *entry;
struct hlist_node *n, *tmp;
char str[KSYM_SYMBOL_LEN];
int type = MATCH_FULL;
type = ftrace_setup_glob(glob, strlen(glob), &search, ¬);
len = strlen(search);
- /* we do not support '!' for function hooks */
+ /* we do not support '!' for function probes */
if (WARN_ON(not))
return;
}
hlist_for_each_entry_safe(entry, n, tmp, hhd, node) {
/* break up if statements for readability */
- if ((flags & HOOK_TEST_FUNC) && entry->ops != ops)
+ if ((flags & PROBE_TEST_FUNC) && entry->ops != ops)
continue;
- if ((flags & HOOK_TEST_DATA) && entry->data != data)
+ if ((flags & PROBE_TEST_DATA) && entry->data != data)
continue;
/* do this last, since it is the most expensive */
call_rcu(&entry->rcu, ftrace_free_entry_rcu);
}
}
- __disable_ftrace_function_hook();
+ __disable_ftrace_function_probe();
mutex_unlock(&ftrace_lock);
}
void
-unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops,
+unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
void *data)
{
- __unregister_ftrace_function_hook(glob, ops, data,
- HOOK_TEST_FUNC | HOOK_TEST_DATA);
+ __unregister_ftrace_function_probe(glob, ops, data,
+ PROBE_TEST_FUNC | PROBE_TEST_DATA);
}
void
-unregister_ftrace_function_hook_func(char *glob, struct ftrace_hook_ops *ops)
+unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
{
- __unregister_ftrace_function_hook(glob, ops, NULL, HOOK_TEST_FUNC);
+ __unregister_ftrace_function_probe(glob, ops, NULL, PROBE_TEST_FUNC);
}
-void unregister_ftrace_function_hook_all(char *glob)
+void unregister_ftrace_function_probe_all(char *glob)
{
- __unregister_ftrace_function_hook(glob, NULL, NULL, 0);
+ __unregister_ftrace_function_probe(glob, NULL, NULL, 0);
}
static LIST_HEAD(ftrace_commands);
static int ftrace_process_regex(char *buff, int len, int enable)
{
- struct ftrace_func_command *p;
char *func, *command, *next = buff;
+ struct ftrace_func_command *p;
int ret = -EINVAL;
func = strsep(&next, ":");
return ftrace_regex_release(inode, file, 0);
}
-static struct file_operations ftrace_avail_fops = {
+static const struct file_operations ftrace_avail_fops = {
.open = ftrace_avail_open,
.read = seq_read,
.llseek = seq_lseek,
.release = ftrace_avail_release,
};
-static struct file_operations ftrace_failures_fops = {
+static const struct file_operations ftrace_failures_fops = {
.open = ftrace_failures_open,
.read = seq_read,
.llseek = seq_lseek,
.release = ftrace_avail_release,
};
-static struct file_operations ftrace_filter_fops = {
+static const struct file_operations ftrace_filter_fops = {
.open = ftrace_filter_open,
.read = ftrace_regex_read,
.write = ftrace_filter_write,
.release = ftrace_filter_release,
};
-static struct file_operations ftrace_notrace_fops = {
+static const struct file_operations ftrace_notrace_fops = {
.open = ftrace_notrace_open,
.read = ftrace_regex_read,
.write = ftrace_notrace_write,
mutex_lock(&graph_lock);
+ /* Nothing, tell g_show to print all functions are enabled */
+ if (!ftrace_graph_count && !*pos)
+ return (void *)1;
+
p = g_next(m, p, pos);
return p;
if (!ptr)
return 0;
+ if (ptr == (unsigned long *)1) {
+ seq_printf(m, "#### all functions enabled ####\n");
+ return 0;
+ }
+
kallsyms_lookup(*ptr, NULL, NULL, NULL, str);
seq_printf(m, "%s\n", str);
}
static int
-ftrace_set_func(unsigned long *array, int idx, char *buffer)
+ftrace_set_func(unsigned long *array, int *idx, char *buffer)
{
- char str[KSYM_SYMBOL_LEN];
struct dyn_ftrace *rec;
struct ftrace_page *pg;
+ int search_len;
int found = 0;
- int j;
+ int type, not;
+ char *search;
+ bool exists;
+ int i;
if (ftrace_disabled)
return -ENODEV;
+ /* decode regex */
+ type = ftrace_setup_glob(buffer, strlen(buffer), &search, ¬);
+ if (not)
+ return -EINVAL;
+
+ search_len = strlen(search);
+
mutex_lock(&ftrace_lock);
do_for_each_ftrace_rec(pg, rec) {
+ if (*idx >= FTRACE_GRAPH_MAX_FUNCS)
+ break;
+
if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
continue;
- kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
- if (strcmp(str, buffer) == 0) {
- /* Return 1 if we add it to the array */
- found = 1;
- for (j = 0; j < idx; j++)
- if (array[j] == rec->ip) {
- found = 0;
+ if (ftrace_match_record(rec, search, search_len, type)) {
+ /* ensure it is not already in the array */
+ exists = false;
+ for (i = 0; i < *idx; i++)
+ if (array[i] == rec->ip) {
+ exists = true;
break;
}
- if (found)
- array[idx] = rec->ip;
- goto out;
+ if (!exists) {
+ array[(*idx)++] = rec->ip;
+ found = 1;
+ }
}
} while_for_each_ftrace_rec();
- out:
+
mutex_unlock(&ftrace_lock);
return found ? 0 : -EINVAL;
}
buffer[index] = 0;
- /* we allow only one at a time */
- ret = ftrace_set_func(array, ftrace_graph_count, buffer);
+ /* we allow only one expression at a time */
+ ret = ftrace_set_func(array, &ftrace_graph_count, buffer);
if (ret)
goto out;
- ftrace_graph_count++;
-
file->f_pos += read;
ret = read;
return cnt;
}
-static struct file_operations ftrace_pid_fops = {
+static const struct file_operations ftrace_pid_fops = {
.read = ftrace_pid_read,
.write = ftrace_pid_write,
};
"'set_ftrace_pid' entry\n");
return 0;
}
-
fs_initcall(ftrace_init_debugfs);
/**
projects / linux-2.6-omap-h63xx.git / blobdiff