#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ctype.h>
+#include <linux/slab.h>
#include <linux/delay.h>
+#include <asm/setup.h>
+
#include "trace_output.h"
+#undef TRACE_SYSTEM
#define TRACE_SYSTEM "TRACE_SYSTEM"
DEFINE_MUTEX(event_mutex);
LIST_HEAD(ftrace_events);
-int trace_define_field(struct ftrace_event_call *call, char *type,
- char *name, int offset, int size, int is_signed)
+int trace_define_field(struct ftrace_event_call *call, const char *type,
+ const char *name, int offset, int size, int is_signed,
+ int filter_type)
{
struct ftrace_event_field *field;
if (!field->type)
goto err;
+ if (filter_type == FILTER_OTHER)
+ field->filter_type = filter_assign_type(type);
+ else
+ field->filter_type = filter_type;
+
field->offset = offset;
field->size = size;
field->is_signed = is_signed;
+
list_add(&field->link, &call->fields);
return 0;
err:
- if (field) {
+ if (field)
kfree(field->name);
- kfree(field->type);
- }
kfree(field);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(trace_define_field);
-#ifdef CONFIG_MODULES
+#define __common_field(type, item) \
+ ret = trace_define_field(call, #type, "common_" #item, \
+ offsetof(typeof(ent), item), \
+ sizeof(ent.item), \
+ is_signed_type(type), FILTER_OTHER); \
+ if (ret) \
+ return ret;
-static void trace_destroy_fields(struct ftrace_event_call *call)
+static int trace_define_common_fields(struct ftrace_event_call *call)
+{
+ int ret;
+ struct trace_entry ent;
+
+ __common_field(unsigned short, type);
+ __common_field(unsigned char, flags);
+ __common_field(unsigned char, preempt_count);
+ __common_field(int, pid);
+ __common_field(int, lock_depth);
+
+ return ret;
+}
+
+void trace_destroy_fields(struct ftrace_event_call *call)
{
struct ftrace_event_field *field, *next;
}
}
-#endif /* CONFIG_MODULES */
+int trace_event_raw_init(struct ftrace_event_call *call)
+{
+ int id;
+
+ id = register_ftrace_event(call->event);
+ if (!id)
+ return -ENODEV;
+ call->id = id;
+ INIT_LIST_HEAD(&call->fields);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(trace_event_raw_init);
-static void ftrace_event_enable_disable(struct ftrace_event_call *call,
+static int ftrace_event_enable_disable(struct ftrace_event_call *call,
int enable)
{
+ int ret = 0;
+
switch (enable) {
case 0:
if (call->enabled) {
call->enabled = 0;
tracing_stop_cmdline_record();
- call->unregfunc();
+ call->unregfunc(call);
}
break;
case 1:
if (!call->enabled) {
- call->enabled = 1;
tracing_start_cmdline_record();
- call->regfunc();
+ ret = call->regfunc(call);
+ if (ret) {
+ tracing_stop_cmdline_record();
+ pr_info("event trace: Could not enable event "
+ "%s\n", call->name);
+ break;
+ }
+ call->enabled = 1;
}
break;
}
+
+ return ret;
}
static void ftrace_clear_events(void)
ftrace_event_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
- size_t read = 0;
- int i, set = 1;
- ssize_t ret;
- char *buf;
- char ch;
+ struct trace_parser parser;
+ ssize_t read, ret;
- if (!cnt || cnt < 0)
+ if (!cnt)
return 0;
ret = tracing_update_buffers();
if (ret < 0)
return ret;
- ret = get_user(ch, ubuf++);
- if (ret)
- return ret;
- read++;
- cnt--;
-
- /* skip white space */
- while (cnt && isspace(ch)) {
- ret = get_user(ch, ubuf++);
- if (ret)
- return ret;
- read++;
- cnt--;
- }
-
- /* Only white space found? */
- if (isspace(ch)) {
- file->f_pos += read;
- ret = read;
- return ret;
- }
-
- buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL);
- if (!buf)
+ if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1))
return -ENOMEM;
- if (cnt > EVENT_BUF_SIZE)
- cnt = EVENT_BUF_SIZE;
+ read = trace_get_user(&parser, ubuf, cnt, ppos);
+
+ if (read >= 0 && trace_parser_loaded((&parser))) {
+ int set = 1;
- i = 0;
- while (cnt && !isspace(ch)) {
- if (!i && ch == '!')
+ if (*parser.buffer == '!')
set = 0;
- else
- buf[i++] = ch;
- ret = get_user(ch, ubuf++);
+ parser.buffer[parser.idx] = 0;
+
+ ret = ftrace_set_clr_event(parser.buffer + !set, set);
if (ret)
- goto out_free;
- read++;
- cnt--;
+ goto out_put;
}
- buf[i] = 0;
-
- file->f_pos += read;
-
- ret = ftrace_set_clr_event(buf, set);
- if (ret)
- goto out_free;
ret = read;
- out_free:
- kfree(buf);
+ out_put:
+ trace_parser_put(&parser);
return ret;
}
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct list_head *list = m->private;
- struct ftrace_event_call *call;
+ struct ftrace_event_call *call = v;
(*pos)++;
- for (;;) {
- if (list == &ftrace_events)
- return NULL;
-
- call = list_entry(list, struct ftrace_event_call, list);
-
+ list_for_each_entry_continue(call, &ftrace_events, list) {
/*
* The ftrace subsystem is for showing formats only.
* They can not be enabled or disabled via the event files.
*/
if (call->regfunc)
- break;
-
- list = list->next;
+ return call;
}
- m->private = list->next;
-
- return call;
+ return NULL;
}
static void *t_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call = NULL;
+ struct ftrace_event_call *call;
loff_t l;
mutex_lock(&event_mutex);
- m->private = ftrace_events.next;
+ call = list_entry(&ftrace_events, struct ftrace_event_call, list);
for (l = 0; l <= *pos; ) {
- call = t_next(m, NULL, &l);
+ call = t_next(m, call, &l);
if (!call)
break;
}
static void *
s_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct list_head *list = m->private;
- struct ftrace_event_call *call;
+ struct ftrace_event_call *call = v;
(*pos)++;
- retry:
- if (list == &ftrace_events)
- return NULL;
-
- call = list_entry(list, struct ftrace_event_call, list);
-
- if (!call->enabled) {
- list = list->next;
- goto retry;
+ list_for_each_entry_continue(call, &ftrace_events, list) {
+ if (call->enabled)
+ return call;
}
- m->private = list->next;
-
- return call;
+ return NULL;
}
static void *s_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call = NULL;
+ struct ftrace_event_call *call;
loff_t l;
mutex_lock(&event_mutex);
- m->private = ftrace_events.next;
+ call = list_entry(&ftrace_events, struct ftrace_event_call, list);
for (l = 0; l <= *pos; ) {
- call = s_next(m, NULL, &l);
+ call = s_next(m, call, &l);
if (!call)
break;
}
case 0:
case 1:
mutex_lock(&event_mutex);
- ftrace_event_enable_disable(call, val);
+ ret = ftrace_event_enable_disable(call, val);
mutex_unlock(&event_mutex);
break;
*ppos += cnt;
- return cnt;
+ return ret ? ret : cnt;
}
static ssize_t
return ret;
}
-extern char *__bad_type_size(void);
-
-#undef FIELD
-#define FIELD(type, name) \
- sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
- #type, "common_" #name, offsetof(typeof(field), name), \
- sizeof(field.name)
-
-static int trace_write_header(struct trace_seq *s)
-{
- struct trace_entry field;
-
- /* struct trace_entry */
- return trace_seq_printf(s,
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\n",
- FIELD(unsigned short, type),
- FIELD(unsigned char, flags),
- FIELD(unsigned char, preempt_count),
- FIELD(int, pid),
- FIELD(int, tgid));
-}
-
static ssize_t
event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
{
struct ftrace_event_call *call = filp->private_data;
+ struct ftrace_event_field *field;
struct trace_seq *s;
+ int common_field_count = 5;
char *buf;
- int r;
+ int r = 0;
if (*ppos)
return 0;
trace_seq_init(s);
- /* If any of the first writes fail, so will the show_format. */
-
trace_seq_printf(s, "name: %s\n", call->name);
trace_seq_printf(s, "ID: %d\n", call->id);
trace_seq_printf(s, "format:\n");
- trace_write_header(s);
- r = call->show_format(s);
+ list_for_each_entry_reverse(field, &call->fields, link) {
+ /*
+ * Smartly shows the array type(except dynamic array).
+ * Normal:
+ * field:TYPE VAR
+ * If TYPE := TYPE[LEN], it is shown:
+ * field:TYPE VAR[LEN]
+ */
+ const char *array_descriptor = strchr(field->type, '[');
+
+ if (!strncmp(field->type, "__data_loc", 10))
+ array_descriptor = NULL;
+
+ if (!array_descriptor) {
+ r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
+ "\tsize:%u;\tsigned:%d;\n",
+ field->type, field->name, field->offset,
+ field->size, !!field->is_signed);
+ } else {
+ r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
+ "\tsize:%u;\tsigned:%d;\n",
+ (int)(array_descriptor - field->type),
+ field->type, field->name,
+ array_descriptor, field->offset,
+ field->size, !!field->is_signed);
+ }
+
+ if (--common_field_count == 0)
+ r = trace_seq_printf(s, "\n");
+
+ if (!r)
+ break;
+ }
+
+ if (r)
+ r = trace_seq_printf(s, "\nprint fmt: %s\n",
+ call->print_fmt);
+
if (!r) {
/*
* ug! The format output is bigger than a PAGE!!
/* First see if we did not already create this dir */
list_for_each_entry(system, &event_subsystems, list) {
- if (strcmp(system->name, name) == 0)
+ if (strcmp(system->name, name) == 0) {
+ system->nr_events++;
return system->entry;
+ }
}
/* need to create new entry */
return d_events;
}
+ system->nr_events = 1;
system->name = kstrdup(name, GFP_KERNEL);
if (!system->name) {
debugfs_remove(system->entry);
"'%s/filter' entry\n", name);
}
- entry = trace_create_file("enable", 0644, system->entry,
- (void *)system->name,
- &ftrace_system_enable_fops);
+ trace_create_file("enable", 0644, system->entry,
+ (void *)system->name,
+ &ftrace_system_enable_fops);
return system->entry;
}
const struct file_operations *filter,
const struct file_operations *format)
{
- struct dentry *entry;
int ret;
/*
if (strcmp(call->system, TRACE_SYSTEM) != 0)
d_events = event_subsystem_dir(call->system, d_events);
- if (call->raw_init) {
- ret = call->raw_init();
- if (ret < 0) {
- pr_warning("Could not initialize trace point"
- " events/%s\n", call->name);
- return ret;
- }
- }
-
call->dir = debugfs_create_dir(call->name, d_events);
if (!call->dir) {
pr_warning("Could not create debugfs "
}
if (call->regfunc)
- entry = trace_create_file("enable", 0644, call->dir, call,
- enable);
+ trace_create_file("enable", 0644, call->dir, call,
+ enable);
- if (call->id && call->profile_enable)
- entry = trace_create_file("id", 0444, call->dir, call,
- id);
+ if (call->id && call->perf_event_enable)
+ trace_create_file("id", 0444, call->dir, call,
+ id);
if (call->define_fields) {
- ret = call->define_fields();
+ ret = trace_define_common_fields(call);
+ if (!ret)
+ ret = call->define_fields(call);
if (ret < 0) {
pr_warning("Could not initialize trace point"
" events/%s\n", call->name);
return ret;
}
- entry = trace_create_file("filter", 0644, call->dir, call,
- filter);
+ trace_create_file("filter", 0644, call->dir, call,
+ filter);
}
- /* A trace may not want to export its format */
- if (!call->show_format)
- return 0;
-
- entry = trace_create_file("format", 0444, call->dir, call,
- format);
+ trace_create_file("format", 0444, call->dir, call,
+ format);
return 0;
}
+static int __trace_add_event_call(struct ftrace_event_call *call)
+{
+ struct dentry *d_events;
+ int ret;
+
+ if (!call->name)
+ return -EINVAL;
+
+ if (call->raw_init) {
+ ret = call->raw_init(call);
+ if (ret < 0) {
+ if (ret != -ENOSYS)
+ pr_warning("Could not initialize trace "
+ "events/%s\n", call->name);
+ return ret;
+ }
+ }
+
+ d_events = event_trace_events_dir();
+ if (!d_events)
+ return -ENOENT;
+
+ ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
+ &ftrace_enable_fops, &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
+ if (!ret)
+ list_add(&call->list, &ftrace_events);
+
+ return ret;
+}
+
+/* Add an additional event_call dynamically */
+int trace_add_event_call(struct ftrace_event_call *call)
+{
+ int ret;
+ mutex_lock(&event_mutex);
+ ret = __trace_add_event_call(call);
+ mutex_unlock(&event_mutex);
+ return ret;
+}
+
+static void remove_subsystem_dir(const char *name)
+{
+ struct event_subsystem *system;
+
+ if (strcmp(name, TRACE_SYSTEM) == 0)
+ return;
+
+ list_for_each_entry(system, &event_subsystems, list) {
+ if (strcmp(system->name, name) == 0) {
+ if (!--system->nr_events) {
+ struct event_filter *filter = system->filter;
+
+ debugfs_remove_recursive(system->entry);
+ list_del(&system->list);
+ if (filter) {
+ kfree(filter->filter_string);
+ kfree(filter);
+ }
+ kfree(system->name);
+ kfree(system);
+ }
+ break;
+ }
+ }
+}
+
+/*
+ * Must be called under locking both of event_mutex and trace_event_mutex.
+ */
+static void __trace_remove_event_call(struct ftrace_event_call *call)
+{
+ ftrace_event_enable_disable(call, 0);
+ if (call->event)
+ __unregister_ftrace_event(call->event);
+ debugfs_remove_recursive(call->dir);
+ list_del(&call->list);
+ trace_destroy_fields(call);
+ destroy_preds(call);
+ remove_subsystem_dir(call->system);
+}
+
+/* Remove an event_call */
+void trace_remove_event_call(struct ftrace_event_call *call)
+{
+ mutex_lock(&event_mutex);
+ down_write(&trace_event_mutex);
+ __trace_remove_event_call(call);
+ up_write(&trace_event_mutex);
+ mutex_unlock(&event_mutex);
+}
+
#define for_each_event(event, start, end) \
for (event = start; \
(unsigned long)event < (unsigned long)end; \
struct ftrace_module_file_ops *file_ops = NULL;
struct ftrace_event_call *call, *start, *end;
struct dentry *d_events;
+ int ret;
start = mod->trace_events;
end = mod->trace_events + mod->num_trace_events;
/* The linker may leave blanks */
if (!call->name)
continue;
-
+ if (call->raw_init) {
+ ret = call->raw_init(call);
+ if (ret < 0) {
+ if (ret != -ENOSYS)
+ pr_warning("Could not initialize trace "
+ "point events/%s\n", call->name);
+ continue;
+ }
+ }
/*
* This module has events, create file ops for this module
* if not already done.
return;
}
call->mod = mod;
- list_add(&call->list, &ftrace_events);
- event_create_dir(call, d_events,
- &file_ops->id, &file_ops->enable,
- &file_ops->filter, &file_ops->format);
+ ret = event_create_dir(call, d_events,
+ &file_ops->id, &file_ops->enable,
+ &file_ops->filter, &file_ops->format);
+ if (!ret)
+ list_add(&call->list, &ftrace_events);
}
}
list_for_each_entry_safe(call, p, &ftrace_events, list) {
if (call->mod == mod) {
found = true;
- ftrace_event_enable_disable(call, 0);
- if (call->event)
- __unregister_ftrace_event(call->event);
- debugfs_remove_recursive(call->dir);
- list_del(&call->list);
- trace_destroy_fields(call);
- destroy_preds(call);
+ __trace_remove_event_call(call);
}
}
}
#endif /* CONFIG_MODULES */
-struct notifier_block trace_module_nb = {
+static struct notifier_block trace_module_nb = {
.notifier_call = trace_module_notify,
.priority = 0,
};
extern struct ftrace_event_call __start_ftrace_events[];
extern struct ftrace_event_call __stop_ftrace_events[];
+static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
+
+static __init int setup_trace_event(char *str)
+{
+ strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
+ ring_buffer_expanded = 1;
+ tracing_selftest_disabled = 1;
+
+ return 1;
+}
+__setup("trace_event=", setup_trace_event);
+
static __init int event_trace_init(void)
{
struct ftrace_event_call *call;
struct dentry *entry;
struct dentry *d_events;
int ret;
+ char *buf = bootup_event_buf;
+ char *token;
d_tracer = tracing_init_dentry();
if (!d_tracer)
/* The linker may leave blanks */
if (!call->name)
continue;
- list_add(&call->list, &ftrace_events);
- event_create_dir(call, d_events, &ftrace_event_id_fops,
- &ftrace_enable_fops, &ftrace_event_filter_fops,
- &ftrace_event_format_fops);
+ if (call->raw_init) {
+ ret = call->raw_init(call);
+ if (ret < 0) {
+ if (ret != -ENOSYS)
+ pr_warning("Could not initialize trace "
+ "point events/%s\n", call->name);
+ continue;
+ }
+ }
+ ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
+ if (!ret)
+ list_add(&call->list, &ftrace_events);
+ }
+
+ while (true) {
+ token = strsep(&buf, ",");
+
+ if (!token)
+ break;
+ if (!*token)
+ continue;
+
+ ret = ftrace_set_clr_event(token, 1);
+ if (ret)
+ pr_warning("Failed to enable trace event: %s\n", token);
}
ret = register_module_notifier(&trace_module_nb);
if (!call->regfunc)
continue;
+/*
+ * Testing syscall events here is pretty useless, but
+ * we still do it if configured. But this is time consuming.
+ * What we really need is a user thread to perform the
+ * syscalls as we test.
+ */
+#ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
+ if (call->system &&
+ strcmp(call->system, "syscalls") == 0)
+ continue;
+#endif
+
pr_info("Testing event %s: ", call->name);
/*
function_test_events_call(unsigned long ip, unsigned long parent_ip)
{
struct ring_buffer_event *event;
+ struct ring_buffer *buffer;
struct ftrace_entry *entry;
unsigned long flags;
long disabled;
local_save_flags(flags);
- event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry),
+ event = trace_current_buffer_lock_reserve(&buffer,
+ TRACE_FN, sizeof(*entry),
flags, pc);
if (!event)
goto out;
entry->ip = ip;
entry->parent_ip = parent_ip;
- trace_nowake_buffer_unlock_commit(event, flags, pc);
+ trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
out:
atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
static __init int event_trace_self_tests_init(void)
{
-
- event_trace_self_tests();
-
- event_trace_self_test_with_function();
+ if (!tracing_selftest_disabled) {
+ event_trace_self_tests();
+ event_trace_self_test_with_function();
+ }
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff