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Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/blktrace.c3
-rw-r--r--kernel/trace/ftrace.c162
-rw-r--r--kernel/trace/trace.c187
-rw-r--r--kernel/trace/trace.h38
-rw-r--r--kernel/trace/trace_events.c30
-rw-r--r--kernel/trace/trace_functions.c143
-rw-r--r--kernel/trace/trace_functions_graph.c3
-rw-r--r--kernel/trace/trace_irqsoff.c10
-rw-r--r--kernel/trace/trace_kprobe.c17
-rw-r--r--kernel/trace/trace_nop.c5
-rw-r--r--kernel/trace/trace_output.c31
-rw-r--r--kernel/trace/trace_probe.h17
-rw-r--r--kernel/trace/trace_sched_wakeup.c10
-rw-r--r--kernel/trace/trace_stack.c3
-rw-r--r--kernel/trace/trace_uprobe.c191
15 files changed, 604 insertions, 246 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 4f3a3c03eadb..c1bd4ada2a04 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1429,7 +1429,8 @@ static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
return print_one_line(iter, true);
}
-static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set)
+static int
+blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
/* don't output context-info for blk_classic output */
if (bit == TRACE_BLK_OPT_CLASSIC) {
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index cd7f76d1eb86..1fd4b9479210 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -237,14 +237,13 @@ static int control_ops_alloc(struct ftrace_ops *ops)
return 0;
}
-static void control_ops_free(struct ftrace_ops *ops)
-{
- free_percpu(ops->disabled);
-}
-
static void update_global_ops(void)
{
- ftrace_func_t func;
+ ftrace_func_t func = ftrace_global_list_func;
+ void *private = NULL;
+
+ /* The list has its own recursion protection. */
+ global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
/*
* If there's only one function registered, then call that
@@ -254,23 +253,17 @@ static void update_global_ops(void)
if (ftrace_global_list == &ftrace_list_end ||
ftrace_global_list->next == &ftrace_list_end) {
func = ftrace_global_list->func;
+ private = ftrace_global_list->private;
/*
* As we are calling the function directly.
* If it does not have recursion protection,
* the function_trace_op needs to be updated
* accordingly.
*/
- if (ftrace_global_list->flags & FTRACE_OPS_FL_RECURSION_SAFE)
- global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
- else
+ if (!(ftrace_global_list->flags & FTRACE_OPS_FL_RECURSION_SAFE))
global_ops.flags &= ~FTRACE_OPS_FL_RECURSION_SAFE;
- } else {
- func = ftrace_global_list_func;
- /* The list has its own recursion protection. */
- global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
}
-
/* If we filter on pids, update to use the pid function */
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
@@ -278,6 +271,7 @@ static void update_global_ops(void)
}
global_ops.func = func;
+ global_ops.private = private;
}
static void ftrace_sync(struct work_struct *work)
@@ -437,6 +431,9 @@ static int remove_ftrace_list_ops(struct ftrace_ops **list,
static int __register_ftrace_function(struct ftrace_ops *ops)
{
+ if (ops->flags & FTRACE_OPS_FL_DELETED)
+ return -EINVAL;
+
if (FTRACE_WARN_ON(ops == &global_ops))
return -EINVAL;
@@ -1172,8 +1169,6 @@ struct ftrace_page {
int size;
};
-static struct ftrace_page *ftrace_new_pgs;
-
#define ENTRY_SIZE sizeof(struct dyn_ftrace)
#define ENTRIES_PER_PAGE (PAGE_SIZE / ENTRY_SIZE)
@@ -1560,7 +1555,7 @@ unsigned long ftrace_location(unsigned long ip)
* the function tracer. It checks the ftrace internal tables to
* determine if the address belongs or not.
*/
-int ftrace_text_reserved(void *start, void *end)
+int ftrace_text_reserved(const void *start, const void *end)
{
unsigned long ret;
@@ -1994,6 +1989,7 @@ int __weak ftrace_arch_code_modify_post_process(void)
void ftrace_modify_all_code(int command)
{
int update = command & FTRACE_UPDATE_TRACE_FUNC;
+ int err = 0;
/*
* If the ftrace_caller calls a ftrace_ops func directly,
@@ -2005,8 +2001,11 @@ void ftrace_modify_all_code(int command)
* to make sure the ops are having the right functions
* traced.
*/
- if (update)
- ftrace_update_ftrace_func(ftrace_ops_list_func);
+ if (update) {
+ err = ftrace_update_ftrace_func(ftrace_ops_list_func);
+ if (FTRACE_WARN_ON(err))
+ return;
+ }
if (command & FTRACE_UPDATE_CALLS)
ftrace_replace_code(1);
@@ -2019,13 +2018,16 @@ void ftrace_modify_all_code(int command)
/* If irqs are disabled, we are in stop machine */
if (!irqs_disabled())
smp_call_function(ftrace_sync_ipi, NULL, 1);
- ftrace_update_ftrace_func(ftrace_trace_function);
+ err = ftrace_update_ftrace_func(ftrace_trace_function);
+ if (FTRACE_WARN_ON(err))
+ return;
}
if (command & FTRACE_START_FUNC_RET)
- ftrace_enable_ftrace_graph_caller();
+ err = ftrace_enable_ftrace_graph_caller();
else if (command & FTRACE_STOP_FUNC_RET)
- ftrace_disable_ftrace_graph_caller();
+ err = ftrace_disable_ftrace_graph_caller();
+ FTRACE_WARN_ON(err);
}
static int __ftrace_modify_code(void *data)
@@ -2093,6 +2095,11 @@ static ftrace_func_t saved_ftrace_func;
static int ftrace_start_up;
static int global_start_up;
+static void control_ops_free(struct ftrace_ops *ops)
+{
+ free_percpu(ops->disabled);
+}
+
static void ftrace_startup_enable(int command)
{
if (saved_ftrace_func != ftrace_trace_function) {
@@ -2244,7 +2251,6 @@ static void ftrace_shutdown_sysctl(void)
}
static cycle_t ftrace_update_time;
-static unsigned long ftrace_update_cnt;
unsigned long ftrace_update_tot_cnt;
static inline int ops_traces_mod(struct ftrace_ops *ops)
@@ -2300,11 +2306,12 @@ static int referenced_filters(struct dyn_ftrace *rec)
return cnt;
}
-static int ftrace_update_code(struct module *mod)
+static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
{
struct ftrace_page *pg;
struct dyn_ftrace *p;
cycle_t start, stop;
+ unsigned long update_cnt = 0;
unsigned long ref = 0;
bool test = false;
int i;
@@ -2330,9 +2337,8 @@ static int ftrace_update_code(struct module *mod)
}
start = ftrace_now(raw_smp_processor_id());
- ftrace_update_cnt = 0;
- for (pg = ftrace_new_pgs; pg; pg = pg->next) {
+ for (pg = new_pgs; pg; pg = pg->next) {
for (i = 0; i < pg->index; i++) {
int cnt = ref;
@@ -2353,7 +2359,7 @@ static int ftrace_update_code(struct module *mod)
if (!ftrace_code_disable(mod, p))
break;
- ftrace_update_cnt++;
+ update_cnt++;
/*
* If the tracing is enabled, go ahead and enable the record.
@@ -2372,11 +2378,9 @@ static int ftrace_update_code(struct module *mod)
}
}
- ftrace_new_pgs = NULL;
-
stop = ftrace_now(raw_smp_processor_id());
ftrace_update_time = stop - start;
- ftrace_update_tot_cnt += ftrace_update_cnt;
+ ftrace_update_tot_cnt += update_cnt;
return 0;
}
@@ -2468,22 +2472,6 @@ ftrace_allocate_pages(unsigned long num_to_init)
return NULL;
}
-static int __init ftrace_dyn_table_alloc(unsigned long num_to_init)
-{
- int cnt;
-
- if (!num_to_init) {
- pr_info("ftrace: No functions to be traced?\n");
- return -1;
- }
-
- cnt = num_to_init / ENTRIES_PER_PAGE;
- pr_info("ftrace: allocating %ld entries in %d pages\n",
- num_to_init, cnt + 1);
-
- return 0;
-}
-
#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
struct ftrace_iterator {
@@ -2871,7 +2859,9 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
static int
ftrace_filter_open(struct inode *inode, struct file *file)
{
- return ftrace_regex_open(&global_ops,
+ struct ftrace_ops *ops = inode->i_private;
+
+ return ftrace_regex_open(ops,
FTRACE_ITER_FILTER | FTRACE_ITER_DO_HASH,
inode, file);
}
@@ -2879,7 +2869,9 @@ ftrace_filter_open(struct inode *inode, struct file *file)
static int
ftrace_notrace_open(struct inode *inode, struct file *file)
{
- return ftrace_regex_open(&global_ops, FTRACE_ITER_NOTRACE,
+ struct ftrace_ops *ops = inode->i_private;
+
+ return ftrace_regex_open(ops, FTRACE_ITER_NOTRACE,
inode, file);
}
@@ -4109,6 +4101,36 @@ static const struct file_operations ftrace_graph_notrace_fops = {
};
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+void ftrace_create_filter_files(struct ftrace_ops *ops,
+ struct dentry *parent)
+{
+
+ trace_create_file("set_ftrace_filter", 0644, parent,
+ ops, &ftrace_filter_fops);
+
+ trace_create_file("set_ftrace_notrace", 0644, parent,
+ ops, &ftrace_notrace_fops);
+}
+
+/*
+ * The name "destroy_filter_files" is really a misnomer. Although
+ * in the future, it may actualy delete the files, but this is
+ * really intended to make sure the ops passed in are disabled
+ * and that when this function returns, the caller is free to
+ * free the ops.
+ *
+ * The "destroy" name is only to match the "create" name that this
+ * should be paired with.
+ */
+void ftrace_destroy_filter_files(struct ftrace_ops *ops)
+{
+ mutex_lock(&ftrace_lock);
+ if (ops->flags & FTRACE_OPS_FL_ENABLED)
+ ftrace_shutdown(ops, 0);
+ ops->flags |= FTRACE_OPS_FL_DELETED;
+ mutex_unlock(&ftrace_lock);
+}
+
static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
{
@@ -4118,11 +4140,7 @@ static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
trace_create_file("enabled_functions", 0444,
d_tracer, NULL, &ftrace_enabled_fops);
- trace_create_file("set_ftrace_filter", 0644, d_tracer,
- NULL, &ftrace_filter_fops);
-
- trace_create_file("set_ftrace_notrace", 0644, d_tracer,
- NULL, &ftrace_notrace_fops);
+ ftrace_create_filter_files(&global_ops, d_tracer);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
trace_create_file("set_graph_function", 0444, d_tracer,
@@ -4238,9 +4256,6 @@ static int ftrace_process_locs(struct module *mod,
/* Assign the last page to ftrace_pages */
ftrace_pages = pg;
- /* These new locations need to be initialized */
- ftrace_new_pgs = start_pg;
-
/*
* We only need to disable interrupts on start up
* because we are modifying code that an interrupt
@@ -4251,7 +4266,7 @@ static int ftrace_process_locs(struct module *mod,
*/
if (!mod)
local_irq_save(flags);
- ftrace_update_code(mod);
+ ftrace_update_code(mod, start_pg);
if (!mod)
local_irq_restore(flags);
ret = 0;
@@ -4360,30 +4375,27 @@ struct notifier_block ftrace_module_exit_nb = {
.priority = INT_MIN, /* Run after anything that can remove kprobes */
};
-extern unsigned long __start_mcount_loc[];
-extern unsigned long __stop_mcount_loc[];
-
void __init ftrace_init(void)
{
- unsigned long count, addr, flags;
+ extern unsigned long __start_mcount_loc[];
+ extern unsigned long __stop_mcount_loc[];
+ unsigned long count, flags;
int ret;
- /* Keep the ftrace pointer to the stub */
- addr = (unsigned long)ftrace_stub;
-
local_irq_save(flags);
- ftrace_dyn_arch_init(&addr);
+ ret = ftrace_dyn_arch_init();
local_irq_restore(flags);
-
- /* ftrace_dyn_arch_init places the return code in addr */
- if (addr)
+ if (ret)
goto failed;
count = __stop_mcount_loc - __start_mcount_loc;
-
- ret = ftrace_dyn_table_alloc(count);
- if (ret)
+ if (!count) {
+ pr_info("ftrace: No functions to be traced?\n");
goto failed;
+ }
+
+ pr_info("ftrace: allocating %ld entries in %ld pages\n",
+ count, count / ENTRIES_PER_PAGE + 1);
last_ftrace_enabled = ftrace_enabled = 1;
@@ -4431,7 +4443,13 @@ static inline void ftrace_startup_enable(int command) { }
(ops)->flags |= FTRACE_OPS_FL_ENABLED; \
___ret; \
})
-# define ftrace_shutdown(ops, command) __unregister_ftrace_function(ops)
+# define ftrace_shutdown(ops, command) \
+ ({ \
+ int ___ret = __unregister_ftrace_function(ops); \
+ if (!___ret) \
+ (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
+ ___ret; \
+ })
# define ftrace_startup_sysctl() do { } while (0)
# define ftrace_shutdown_sysctl() do { } while (0)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 24c1f2382557..9be67c5e5b0f 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -73,7 +73,8 @@ static struct tracer_flags dummy_tracer_flags = {
.opts = dummy_tracer_opt
};
-static int dummy_set_flag(u32 old_flags, u32 bit, int set)
+static int
+dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
return 0;
}
@@ -118,7 +119,7 @@ enum ftrace_dump_mode ftrace_dump_on_oops;
/* When set, tracing will stop when a WARN*() is hit */
int __disable_trace_on_warning;
-static int tracing_set_tracer(const char *buf);
+static int tracing_set_tracer(struct trace_array *tr, const char *buf);
#define MAX_TRACER_SIZE 100
static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;
@@ -180,6 +181,17 @@ static int __init set_trace_boot_options(char *str)
}
__setup("trace_options=", set_trace_boot_options);
+static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata;
+static char *trace_boot_clock __initdata;
+
+static int __init set_trace_boot_clock(char *str)
+{
+ strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
+ trace_boot_clock = trace_boot_clock_buf;
+ return 0;
+}
+__setup("trace_clock=", set_trace_boot_clock);
+
unsigned long long ns2usecs(cycle_t nsec)
{
@@ -1230,7 +1242,7 @@ int register_tracer(struct tracer *type)
printk(KERN_INFO "Starting tracer '%s'\n", type->name);
/* Do we want this tracer to start on bootup? */
- tracing_set_tracer(type->name);
+ tracing_set_tracer(&global_trace, type->name);
default_bootup_tracer = NULL;
/* disable other selftests, since this will break it. */
tracing_selftest_disabled = true;
@@ -3137,27 +3149,52 @@ static int tracing_open(struct inode *inode, struct file *file)
return ret;
}
+/*
+ * Some tracers are not suitable for instance buffers.
+ * A tracer is always available for the global array (toplevel)
+ * or if it explicitly states that it is.
+ */
+static bool
+trace_ok_for_array(struct tracer *t, struct trace_array *tr)
+{
+ return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances;
+}
+
+/* Find the next tracer that this trace array may use */
+static struct tracer *
+get_tracer_for_array(struct trace_array *tr, struct tracer *t)
+{
+ while (t && !trace_ok_for_array(t, tr))
+ t = t->next;
+
+ return t;
+}
+
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
+ struct trace_array *tr = m->private;
struct tracer *t = v;
(*pos)++;
if (t)
- t = t->next;
+ t = get_tracer_for_array(tr, t->next);
return t;
}
static void *t_start(struct seq_file *m, loff_t *pos)
{
+ struct trace_array *tr = m->private;
struct tracer *t;
loff_t l = 0;
mutex_lock(&trace_types_lock);
- for (t = trace_types; t && l < *pos; t = t_next(m, t, &l))
- ;
+
+ t = get_tracer_for_array(tr, trace_types);
+ for (; t && l < *pos; t = t_next(m, t, &l))
+ ;
return t;
}
@@ -3192,10 +3229,21 @@ static const struct seq_operations show_traces_seq_ops = {
static int show_traces_open(struct inode *inode, struct file *file)
{
+ struct trace_array *tr = inode->i_private;
+ struct seq_file *m;
+ int ret;
+
if (tracing_disabled)
return -ENODEV;
- return seq_open(file, &show_traces_seq_ops);
+ ret = seq_open(file, &show_traces_seq_ops);
+ if (ret)
+ return ret;
+
+ m = file->private_data;
+ m->private = tr;
+
+ return 0;
}
static ssize_t
@@ -3355,13 +3403,14 @@ static int tracing_trace_options_show(struct seq_file *m, void *v)
return 0;
}
-static int __set_tracer_option(struct tracer *trace,
+static int __set_tracer_option(struct trace_array *tr,
struct tracer_flags *tracer_flags,
struct tracer_opt *opts, int neg)
{
+ struct tracer *trace = tr->current_trace;
int ret;
- ret = trace->set_flag(tracer_flags->val, opts->bit, !neg);
+ ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
if (ret)
return ret;
@@ -3373,8 +3422,9 @@ static int __set_tracer_option(struct tracer *trace,
}
/* Try to assign a tracer specific option */
-static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
+static int set_tracer_option(struct trace_array *tr, char *cmp, int neg)
{
+ struct tracer *trace = tr->current_trace;
struct tracer_flags *tracer_flags = trace->flags;
struct tracer_opt *opts = NULL;
int i;
@@ -3383,8 +3433,7 @@ static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
opts = &tracer_flags->opts[i];
if (strcmp(cmp, opts->name) == 0)
- return __set_tracer_option(trace, trace->flags,
- opts, neg);
+ return __set_tracer_option(tr, trace->flags, opts, neg);
}
return -EINVAL;
@@ -3407,7 +3456,7 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
/* Give the tracer a chance to approve the change */
if (tr->current_trace->flag_changed)
- if (tr->current_trace->flag_changed(tr->current_trace, mask, !!enabled))
+ if (tr->current_trace->flag_changed(tr, mask, !!enabled))
return -EINVAL;
if (enabled)
@@ -3456,7 +3505,7 @@ static int trace_set_options(struct trace_array *tr, char *option)
/* If no option could be set, test the specific tracer options */
if (!trace_options[i])
- ret = set_tracer_option(tr->current_trace, cmp, neg);
+ ret = set_tracer_option(tr, cmp, neg);
mutex_unlock(&trace_types_lock);
@@ -3885,10 +3934,26 @@ create_trace_option_files(struct trace_array *tr, struct tracer *tracer);
static void
destroy_trace_option_files(struct trace_option_dentry *topts);
-static int tracing_set_tracer(const char *buf)
+/*
+ * Used to clear out the tracer before deletion of an instance.
+ * Must have trace_types_lock held.
+ */
+static void tracing_set_nop(struct trace_array *tr)
+{
+ if (tr->current_trace == &nop_trace)
+ return;
+
+ tr->current_trace->enabled--;
+
+ if (tr->current_trace->reset)
+ tr->current_trace->reset(tr);
+
+ tr->current_trace = &nop_trace;
+}
+
+static int tracing_set_tracer(struct trace_array *tr, const char *buf)
{
static struct trace_option_dentry *topts;
- struct trace_array *tr = &global_trace;
struct tracer *t;
#ifdef CONFIG_TRACER_MAX_TRACE
bool had_max_tr;
@@ -3916,9 +3981,15 @@ static int tracing_set_tracer(const char *buf)
if (t == tr->current_trace)
goto out;
+ /* Some tracers are only allowed for the top level buffer */
+ if (!trace_ok_for_array(t, tr)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
trace_branch_disable();
- tr->current_trace->enabled = false;
+ tr->current_trace->enabled--;
if (tr->current_trace->reset)
tr->current_trace->reset(tr);
@@ -3941,9 +4012,11 @@ static int tracing_set_tracer(const char *buf)
free_snapshot(tr);
}
#endif
- destroy_trace_option_files(topts);
-
- topts = create_trace_option_files(tr, t);
+ /* Currently, only the top instance has options */
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
+ destroy_trace_option_files(topts);
+ topts = create_trace_option_files(tr, t);
+ }
#ifdef CONFIG_TRACER_MAX_TRACE
if (t->use_max_tr && !had_max_tr) {
@@ -3960,7 +4033,7 @@ static int tracing_set_tracer(const char *buf)
}
tr->current_trace = t;
- tr->current_trace->enabled = true;
+ tr->current_trace->enabled++;
trace_branch_enable(tr);
out:
mutex_unlock(&trace_types_lock);
@@ -3972,6 +4045,7 @@ static ssize_t
tracing_set_trace_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
+ struct trace_array *tr = filp->private_data;
char buf[MAX_TRACER_SIZE+1];
int i;
size_t ret;
@@ -3991,7 +4065,7 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
buf[i] = 0;
- err = tracing_set_tracer(buf);
+ err = tracing_set_tracer(tr, buf);
if (err)
return err;
@@ -4699,25 +4773,10 @@ static int tracing_clock_show(struct seq_file *m, void *v)
return 0;
}
-static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
- size_t cnt, loff_t *fpos)
+static int tracing_set_clock(struct trace_array *tr, const char *clockstr)
{
- struct seq_file *m = filp->private_data;
- struct trace_array *tr = m->private;
- char buf[64];
- const char *clockstr;
int i;
- if (cnt >= sizeof(buf))
- return -EINVAL;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt] = 0;
-
- clockstr = strstrip(buf);
-
for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) {
if (strcmp(trace_clocks[i].name, clockstr) == 0)
break;
@@ -4745,6 +4804,32 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
mutex_unlock(&trace_types_lock);
+ return 0;
+}
+
+static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *fpos)
+{
+ struct seq_file *m = filp->private_data;
+ struct trace_array *tr = m->private;
+ char buf[64];
+ const char *clockstr;
+ int ret;
+
+ if (cnt >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ clockstr = strstrip(buf);
+
+ ret = tracing_set_clock(tr, clockstr);
+ if (ret)
+ return ret;
+
*fpos += cnt;
return cnt;
@@ -5705,7 +5790,7 @@ trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
if (!!(topt->flags->val & topt->opt->bit) != val) {
mutex_lock(&trace_types_lock);
- ret = __set_tracer_option(topt->tr->current_trace, topt->flags,
+ ret = __set_tracer_option(topt->tr, topt->flags,
topt->opt, !val);
mutex_unlock(&trace_types_lock);
if (ret)
@@ -6112,7 +6197,9 @@ static int instance_delete(const char *name)
list_del(&tr->list);
+ tracing_set_nop(tr);
event_trace_del_tracer(tr);
+ ftrace_destroy_function_files(tr);
debugfs_remove_recursive(tr->dir);
free_percpu(tr->trace_buffer.data);
ring_buffer_free(tr->trace_buffer.buffer);
@@ -6207,6 +6294,12 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
{
int cpu;
+ trace_create_file("available_tracers", 0444, d_tracer,
+ tr, &show_traces_fops);
+
+ trace_create_file("current_tracer", 0644, d_tracer,
+ tr, &set_tracer_fops);
+
trace_create_file("tracing_cpumask", 0644, d_tracer,
tr, &tracing_cpumask_fops);
@@ -6237,6 +6330,9 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
trace_create_file("tracing_on", 0644, d_tracer,
tr, &rb_simple_fops);
+ if (ftrace_create_function_files(tr, d_tracer))
+ WARN(1, "Could not allocate function filter files");
+
#ifdef CONFIG_TRACER_SNAPSHOT
trace_create_file("snapshot", 0644, d_tracer,
tr, &snapshot_fops);
@@ -6259,12 +6355,6 @@ static __init int tracer_init_debugfs(void)
init_tracer_debugfs(&global_trace, d_tracer);
- trace_create_file("available_tracers", 0444, d_tracer,
- &global_trace, &show_traces_fops);
-
- trace_create_file("current_tracer", 0644, d_tracer,
- &global_trace, &set_tracer_fops);
-
#ifdef CONFIG_TRACER_MAX_TRACE
trace_create_file("tracing_max_latency", 0644, d_tracer,
&tracing_max_latency, &tracing_max_lat_fops);
@@ -6527,6 +6617,13 @@ __init static int tracer_alloc_buffers(void)
trace_init_cmdlines();
+ if (trace_boot_clock) {
+ ret = tracing_set_clock(&global_trace, trace_boot_clock);
+ if (ret < 0)
+ pr_warning("Trace clock %s not defined, going back to default\n",
+ trace_boot_clock);
+ }
+
/*
* register_tracer() might reference current_trace, so it
* needs to be set before we register anything. This is
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 02b592f2d4b7..ffc314b7e92b 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -210,6 +210,11 @@ struct trace_array {
struct list_head events;
cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
int ref;
+#ifdef CONFIG_FUNCTION_TRACER
+ struct ftrace_ops *ops;
+ /* function tracing enabled */
+ int function_enabled;
+#endif
};
enum {
@@ -355,14 +360,16 @@ struct tracer {
void (*print_header)(struct seq_file *m);
enum print_line_t (*print_line)(struct trace_iterator *iter);
/* If you handled the flag setting, return 0 */
- int (*set_flag)(u32 old_flags, u32 bit, int set);
+ int (*set_flag)(struct trace_array *tr,
+ u32 old_flags, u32 bit, int set);
/* Return 0 if OK with change, else return non-zero */
- int (*flag_changed)(struct tracer *tracer,
+ int (*flag_changed)(struct trace_array *tr,
u32 mask, int set);
struct tracer *next;
struct tracer_flags *flags;
+ int enabled;
bool print_max;
- bool enabled;
+ bool allow_instances;
#ifdef CONFIG_TRACER_MAX_TRACE
bool use_max_tr;
#endif
@@ -812,13 +819,36 @@ static inline int ftrace_trace_task(struct task_struct *task)
return test_tsk_trace_trace(task);
}
extern int ftrace_is_dead(void);
+int ftrace_create_function_files(struct trace_array *tr,
+ struct dentry *parent);
+void ftrace_destroy_function_files(struct trace_array *tr);
#else
static inline int ftrace_trace_task(struct task_struct *task)
{
return 1;
}
static inline int ftrace_is_dead(void) { return 0; }
-#endif
+static inline int
+ftrace_create_function_files(struct trace_array *tr,
+ struct dentry *parent)
+{
+ return 0;
+}
+static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
+void ftrace_create_filter_files(struct ftrace_ops *ops,
+ struct dentry *parent);
+void ftrace_destroy_filter_files(struct ftrace_ops *ops);
+#else
+/*
+ * The ops parameter passed in is usually undefined.
+ * This must be a macro.
+ */
+#define ftrace_create_filter_files(ops, parent) do { } while (0)
+#define ftrace_destroy_filter_files(ops) do { } while (0)
+#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
int ftrace_event_is_function(struct ftrace_event_call *call);
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 7b16d40bd64d..83a4378dc5e0 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -188,6 +188,36 @@ int trace_event_raw_init(struct ftrace_event_call *call)
}
EXPORT_SYMBOL_GPL(trace_event_raw_init);
+void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
+ struct ftrace_event_file *ftrace_file,
+ unsigned long len)
+{
+ struct ftrace_event_call *event_call = ftrace_file->event_call;
+
+ local_save_flags(fbuffer->flags);
+ fbuffer->pc = preempt_count();
+ fbuffer->ftrace_file = ftrace_file;
+
+ fbuffer->event =
+ trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file,
+ event_call->event.type, len,
+ fbuffer->flags, fbuffer->pc);
+ if (!fbuffer->event)
+ return NULL;
+
+ fbuffer->entry = ring_buffer_event_data(fbuffer->event);
+ return fbuffer->entry;
+}
+EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve);
+
+void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer)
+{
+ event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer,
+ fbuffer->event, fbuffer->entry,
+ fbuffer->flags, fbuffer->pc);
+}
+EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit);
+
int ftrace_event_reg(struct ftrace_event_call *call,
enum trace_reg type, void *data)
{
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 38fe1483c508..5b781d2be383 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -13,32 +13,106 @@
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
+#include <linux/slab.h>
#include <linux/fs.h>
#include "trace.h"
-/* function tracing enabled */
-static int ftrace_function_enabled;
+static void tracing_start_function_trace(struct trace_array *tr);
+static void tracing_stop_function_trace(struct trace_array *tr);
+static void
+function_trace_call(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct pt_regs *pt_regs);
+static void
+function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct pt_regs *pt_regs);
+static struct ftrace_ops trace_ops;
+static struct ftrace_ops trace_stack_ops;
+static struct tracer_flags func_flags;
+
+/* Our option */
+enum {
+ TRACE_FUNC_OPT_STACK = 0x1,
+};
+
+static int allocate_ftrace_ops(struct trace_array *tr)
+{
+ struct ftrace_ops *ops;
+
+ ops = kzalloc(sizeof(*ops), GFP_KERNEL);
+ if (!ops)
+ return -ENOMEM;
-static struct trace_array *func_trace;
+ /* Currently only the non stack verision is supported */
+ ops->func = function_trace_call;
+ ops->flags = FTRACE_OPS_FL_RECURSION_SAFE;
+
+ tr->ops = ops;
+ ops->private = tr;
+ return 0;
+}
+
+
+int ftrace_create_function_files(struct trace_array *tr,
+ struct dentry *parent)
+{
+ int ret;
+
+ /* The top level array uses the "global_ops". */
+ if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL)) {
+ ret = allocate_ftrace_ops(tr);
+ if (ret)
+ return ret;
+ }
+
+ ftrace_create_filter_files(tr->ops, parent);
+
+ return 0;
+}
-static void tracing_start_function_trace(void);
-static void tracing_stop_function_trace(void);
+void ftrace_destroy_function_files(struct trace_array *tr)
+{
+ ftrace_destroy_filter_files(tr->ops);
+ kfree(tr->ops);
+ tr->ops = NULL;
+}
static int function_trace_init(struct trace_array *tr)
{
- func_trace = tr;
+ struct ftrace_ops *ops;
+
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
+ /* There's only one global tr */
+ if (!trace_ops.private) {
+ trace_ops.private = tr;
+ trace_stack_ops.private = tr;
+ }
+
+ if (func_flags.val & TRACE_FUNC_OPT_STACK)
+ ops = &trace_stack_ops;
+ else
+ ops = &trace_ops;
+ tr->ops = ops;
+ } else if (!tr->ops) {
+ /*
+ * Instance trace_arrays get their ops allocated
+ * at instance creation. Unless it failed
+ * the allocation.
+ */
+ return -ENOMEM;
+ }
+
tr->trace_buffer.cpu = get_cpu();
put_cpu();
tracing_start_cmdline_record();
- tracing_start_function_trace();
+ tracing_start_function_trace(tr);
return 0;
}
static void function_trace_reset(struct trace_array *tr)
{
- tracing_stop_function_trace();
+ tracing_stop_function_trace(tr);
tracing_stop_cmdline_record();
}
@@ -47,25 +121,18 @@ static void function_trace_start(struct trace_array *tr)
tracing_reset_online_cpus(&tr->trace_buffer);
}
-/* Our option */
-enum {
- TRACE_FUNC_OPT_STACK = 0x1,
-};
-
-static struct tracer_flags func_flags;
-
static void
function_trace_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *pt_regs)
{
- struct trace_array *tr = func_trace;
+ struct trace_array *tr = op->private;
struct trace_array_cpu *data;
unsigned long flags;
int bit;
int cpu;
int pc;
- if (unlikely(!ftrace_function_enabled))
+ if (unlikely(!tr->function_enabled))
return;
pc = preempt_count();
@@ -91,14 +158,14 @@ static void
function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *pt_regs)
{
- struct trace_array *tr = func_trace;
+ struct trace_array *tr = op->private;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
int pc;
- if (unlikely(!ftrace_function_enabled))
+ if (unlikely(!tr->function_enabled))
return;
/*
@@ -128,7 +195,6 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
local_irq_restore(flags);
}
-
static struct ftrace_ops trace_ops __read_mostly =
{
.func = function_trace_call,
@@ -153,29 +219,21 @@ static struct tracer_flags func_flags = {
.opts = func_opts
};
-static void tracing_start_function_trace(void)
+static void tracing_start_function_trace(struct trace_array *tr)
{
- ftrace_function_enabled = 0;
-
- if (func_flags.val & TRACE_FUNC_OPT_STACK)
- register_ftrace_function(&trace_stack_ops);
- else
- register_ftrace_function(&trace_ops);
-
- ftrace_function_enabled = 1;
+ tr->function_enabled = 0;
+ register_ftrace_function(tr->ops);
+ tr->function_enabled = 1;
}
-static void tracing_stop_function_trace(void)
+static void tracing_stop_function_trace(struct trace_array *tr)
{
- ftrace_function_enabled = 0;
-
- if (func_flags.val & TRACE_FUNC_OPT_STACK)
- unregister_ftrace_function(&trace_stack_ops);
- else
- unregister_ftrace_function(&trace_ops);
+ tr->function_enabled = 0;
+ unregister_ftrace_function(tr->ops);
}
-static int func_set_flag(u32 old_flags, u32 bit, int set)
+static int
+func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
switch (bit) {
case TRACE_FUNC_OPT_STACK:
@@ -183,12 +241,14 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
break;
+ unregister_ftrace_function(tr->ops);
+
if (set) {
- unregister_ftrace_function(&trace_ops);
- register_ftrace_function(&trace_stack_ops);
+ tr->ops = &trace_stack_ops;
+ register_ftrace_function(tr->ops);
} else {
- unregister_ftrace_function(&trace_stack_ops);
- register_ftrace_function(&trace_ops);
+ tr->ops = &trace_ops;
+ register_ftrace_function(tr->ops);
}
break;
@@ -208,6 +268,7 @@ static struct tracer function_trace __tracer_data =
.wait_pipe = poll_wait_pipe,
.flags = &func_flags,
.set_flag = func_set_flag,
+ .allow_instances = true,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_function,
#endif
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 0b99120d395c..deff11200261 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1476,7 +1476,8 @@ void graph_trace_close(struct trace_iterator *iter)
}
}
-static int func_graph_set_flag(u32 old_flags, u32 bit, int set)
+static int
+func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
if (bit == TRACE_GRAPH_PRINT_IRQS)
ftrace_graph_skip_irqs = !set;
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 887ef88b0bc7..8ff02cbb892f 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -160,7 +160,8 @@ static struct ftrace_ops trace_ops __read_mostly =
#endif /* CONFIG_FUNCTION_TRACER */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static int irqsoff_set_flag(u32 old_flags, u32 bit, int set)
+static int
+irqsoff_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
int cpu;
@@ -266,7 +267,8 @@ __trace_function(struct trace_array *tr,
#else
#define __trace_function trace_function
-static int irqsoff_set_flag(u32 old_flags, u32 bit, int set)
+static int
+irqsoff_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
return -EINVAL;
}
@@ -570,8 +572,10 @@ static void irqsoff_function_set(int set)
unregister_irqsoff_function(is_graph());
}
-static int irqsoff_flag_changed(struct tracer *tracer, u32 mask, int set)
+static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
{
+ struct tracer *tracer = tr->current_trace;
+
if (mask & TRACE_ITER_FUNCTION)
irqsoff_function_set(set);
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index bdbae450c13e..d021d21dd150 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -35,11 +35,6 @@ struct trace_kprobe {
struct trace_probe tp;
};
-struct event_file_link {
- struct ftrace_event_file *file;
- struct list_head list;
-};
-
#define SIZEOF_TRACE_KPROBE(n) \
(offsetof(struct trace_kprobe, tp.args) + \
(sizeof(struct probe_arg) * (n)))
@@ -387,18 +382,6 @@ enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file)
return ret;
}
-static struct event_file_link *
-find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
-{
- struct event_file_link *link;
-
- list_for_each_entry(link, &tp->files, list)
- if (link->file == file)
- return link;
-
- return NULL;
-}
-
/*
* Disable trace_probe
* if the file is NULL, disable "perf" handler, or disable "trace" handler.
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index 394f94417e2f..69a5cc94c01a 100644
--- a/kernel/trace/trace_nop.c
+++ b/kernel/trace/trace_nop.c
@@ -62,7 +62,7 @@ static void nop_trace_reset(struct trace_array *tr)
* If you don't implement it, then the flag setting will be
* automatically accepted.
*/
-static int nop_set_flag(u32 old_flags, u32 bit, int set)
+static int nop_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
/*
* Note that you don't need to update nop_flags.val yourself.
@@ -96,6 +96,7 @@ struct tracer nop_trace __read_mostly =
.selftest = trace_selftest_startup_nop,
#endif
.flags = &nop_flags,
- .set_flag = nop_set_flag
+ .set_flag = nop_set_flag,
+ .allow_instances = true,
};
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index ed32284fbe32..ca0e79e2abaa 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -439,6 +439,37 @@ int ftrace_raw_output_prep(struct trace_iterator *iter,
}
EXPORT_SYMBOL(ftrace_raw_output_prep);
+static int ftrace_output_raw(struct trace_iterator *iter, char *name,
+ char *fmt, va_list ap)
+{
+ struct trace_seq *s = &iter->seq;
+ int ret;
+
+ ret = trace_seq_printf(s, "%s: ", name);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ ret = trace_seq_vprintf(s, fmt, ap);
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
+int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = ftrace_output_raw(iter, name, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ftrace_output_call);
+
#ifdef CONFIG_KRETPROBES
static inline const char *kretprobed(const char *name)
{
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index b73574a5f429..fb1ab5dfbd42 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -288,6 +288,11 @@ struct trace_probe {
struct probe_arg args[];
};
+struct event_file_link {
+ struct ftrace_event_file *file;
+ struct list_head list;
+};
+
static inline bool trace_probe_is_enabled(struct trace_probe *tp)
{
return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
@@ -316,6 +321,18 @@ static inline int is_good_name(const char *name)
return 1;
}
+static inline struct event_file_link *
+find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
+{
+ struct event_file_link *link;
+
+ list_for_each_entry(link, &tp->files, list)
+ if (link->file == file)
+ return link;
+
+ return NULL;
+}
+
extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
struct probe_arg *parg, bool is_return, bool is_kprobe);
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 6e32635e5e57..e14da5e97a69 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -179,8 +179,10 @@ static void wakeup_function_set(int set)
unregister_wakeup_function(is_graph());
}
-static int wakeup_flag_changed(struct tracer *tracer, u32 mask, int set)
+static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
{
+ struct tracer *tracer = tr->current_trace;
+
if (mask & TRACE_ITER_FUNCTION)
wakeup_function_set(set);
@@ -209,7 +211,8 @@ static void stop_func_tracer(int graph)
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static int wakeup_set_flag(u32 old_flags, u32 bit, int set)
+static int
+wakeup_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
if (!(bit & TRACE_DISPLAY_GRAPH))
@@ -311,7 +314,8 @@ __trace_function(struct trace_array *tr,
#else
#define __trace_function trace_function
-static int wakeup_set_flag(u32 old_flags, u32 bit, int set)
+static int
+wakeup_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
return -EINVAL;
}
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index e6be585cf06a..21b320e5d163 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -13,6 +13,7 @@
#include <linux/sysctl.h>
#include <linux/init.h>
#include <linux/fs.h>
+#include <linux/magic.h>
#include <asm/setup.h>
@@ -144,6 +145,8 @@ check_stack(unsigned long ip, unsigned long *stack)
i++;
}
+ BUG_ON(current != &init_task &&
+ *(end_of_stack(current)) != STACK_END_MAGIC);
out:
arch_spin_unlock(&max_stack_lock);
local_irq_restore(flags);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 79e52d93860b..e4473367e7a4 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -260,6 +260,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
goto error;
INIT_LIST_HEAD(&tu->list);
+ INIT_LIST_HEAD(&tu->tp.files);
tu->consumer.handler = uprobe_dispatcher;
if (is_ret)
tu->consumer.ret_handler = uretprobe_dispatcher;
@@ -758,31 +759,32 @@ static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
mutex_unlock(&ucb->mutex);
}
-static void uprobe_trace_print(struct trace_uprobe *tu,
- unsigned long func, struct pt_regs *regs)
+static void __uprobe_trace_func(struct trace_uprobe *tu,
+ unsigned long func, struct pt_regs *regs,
+ struct uprobe_cpu_buffer *ucb, int dsize,
+ struct ftrace_event_file *ftrace_file)
{
struct uprobe_trace_entry_head *entry;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
- struct uprobe_cpu_buffer *ucb;
void *data;
- int size, dsize, esize;
+ int size, esize;
struct ftrace_event_call *call = &tu->tp.call;
- dsize = __get_data_size(&tu->tp, regs);
- esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+ WARN_ON(call != ftrace_file->event_call);
- if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE))
+ if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
return;
- ucb = uprobe_buffer_get();
- store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
+ if (ftrace_trigger_soft_disabled(ftrace_file))
+ return;
+ esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
size = esize + tu->tp.size + dsize;
- event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
- size, 0, 0);
+ event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
+ call->event.type, size, 0, 0);
if (!event)
- goto out;
+ return;
entry = ring_buffer_event_data(event);
if (is_ret_probe(tu)) {
@@ -796,25 +798,36 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
memcpy(data, ucb->buf, tu->tp.size + dsize);
- if (!call_filter_check_discard(call, entry, buffer, event))
- trace_buffer_unlock_commit(buffer, event, 0, 0);
-
-out:
- uprobe_buffer_put(ucb);
+ event_trigger_unlock_commit(ftrace_file, buffer, event, entry, 0, 0);
}
/* uprobe handler */
-static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
+static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
+ struct uprobe_cpu_buffer *ucb, int dsize)
{
- if (!is_ret_probe(tu))
- uprobe_trace_print(tu, 0, regs);
+ struct event_file_link *link;
+
+ if (is_ret_probe(tu))
+ return 0;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(link, &tu->tp.files, list)
+ __uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file);
+ rcu_read_unlock();
+
return 0;
}
static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
- struct pt_regs *regs)
+ struct pt_regs *regs,
+ struct uprobe_cpu_buffer *ucb, int dsize)
{
- uprobe_trace_print(tu, func, regs);
+ struct event_file_link *link;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(link, &tu->tp.files, list)
+ __uprobe_trace_func(tu, func, regs, ucb, dsize, link->file);
+ rcu_read_unlock();
}
/* Event entry printers */
@@ -861,12 +874,24 @@ typedef bool (*filter_func_t)(struct uprobe_consumer *self,
struct mm_struct *mm);
static int
-probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
+probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
+ filter_func_t filter)
{
- int ret = 0;
+ bool enabled = trace_probe_is_enabled(&tu->tp);
+ struct event_file_link *link = NULL;
+ int ret;
+
+ if (file) {
+ link = kmalloc(sizeof(*link), GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
- if (trace_probe_is_enabled(&tu->tp))
- return -EINTR;
+ link->file = file;
+ list_add_tail_rcu(&link->list, &tu->tp.files);
+
+ tu->tp.flags |= TP_FLAG_TRACE;
+ } else
+ tu->tp.flags |= TP_FLAG_PROFILE;
ret = uprobe_buffer_enable();
if (ret < 0)
@@ -874,24 +899,49 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
WARN_ON(!uprobe_filter_is_empty(&tu->filter));
- tu->tp.flags |= flag;
+ if (enabled)
+ return 0;
+
tu->consumer.filter = filter;
ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
- if (ret)
- tu->tp.flags &= ~flag;
+ if (ret) {
+ if (file) {
+ list_del(&link->list);
+ kfree(link);
+ tu->tp.flags &= ~TP_FLAG_TRACE;
+ } else
+ tu->tp.flags &= ~TP_FLAG_PROFILE;
+ }
return ret;
}
-static void probe_event_disable(struct trace_uprobe *tu, int flag)
+static void
+probe_event_disable(struct trace_uprobe *tu, struct ftrace_event_file *file)
{
if (!trace_probe_is_enabled(&tu->tp))
return;
+ if (file) {
+ struct event_file_link *link;
+
+ link = find_event_file_link(&tu->tp, file);
+ if (!link)
+ return;
+
+ list_del_rcu(&link->list);
+ /* synchronize with u{,ret}probe_trace_func */
+ synchronize_sched();
+ kfree(link);
+
+ if (!list_empty(&tu->tp.files))
+ return;
+ }
+
WARN_ON(!uprobe_filter_is_empty(&tu->filter));
uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
- tu->tp.flags &= ~flag;
+ tu->tp.flags &= file ? ~TP_FLAG_TRACE : ~TP_FLAG_PROFILE;
uprobe_buffer_disable();
}
@@ -1014,31 +1064,24 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
return ret;
}
-static void uprobe_perf_print(struct trace_uprobe *tu,
- unsigned long func, struct pt_regs *regs)
+static void __uprobe_perf_func(struct trace_uprobe *tu,
+ unsigned long func, struct pt_regs *regs,
+ struct uprobe_cpu_buffer *ucb, int dsize)
{
struct ftrace_event_call *call = &tu->tp.call;
struct uprobe_trace_entry_head *entry;
struct hlist_head *head;
- struct uprobe_cpu_buffer *ucb;
void *data;
- int size, dsize, esize;
+ int size, esize;
int rctx;
- dsize = __get_data_size(&tu->tp, regs);
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
- if (WARN_ON_ONCE(!uprobe_cpu_buffer))
- return;
-
size = esize + tu->tp.size + dsize;
size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
return;
- ucb = uprobe_buffer_get();
- store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
-
preempt_disable();
head = this_cpu_ptr(call->perf_events);
if (hlist_empty(head))
@@ -1068,46 +1111,49 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
out:
preempt_enable();
- uprobe_buffer_put(ucb);
}
/* uprobe profile handler */
-static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
+static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs,
+ struct uprobe_cpu_buffer *ucb, int dsize)
{
if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
if (!is_ret_probe(tu))
- uprobe_perf_print(tu, 0, regs);
+ __uprobe_perf_func(tu, 0, regs, ucb, dsize);
return 0;
}
static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
- struct pt_regs *regs)
+ struct pt_regs *regs,
+ struct uprobe_cpu_buffer *ucb, int dsize)
{
- uprobe_perf_print(tu, func, regs);
+ __uprobe_perf_func(tu, func, regs, ucb, dsize);
}
#endif /* CONFIG_PERF_EVENTS */
-static
-int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type, void *data)
+static int
+trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type,
+ void *data)
{
struct trace_uprobe *tu = event->data;
+ struct ftrace_event_file *file = data;
switch (type) {
case TRACE_REG_REGISTER:
- return probe_event_enable(tu, TP_FLAG_TRACE, NULL);
+ return probe_event_enable(tu, file, NULL);
case TRACE_REG_UNREGISTER:
- probe_event_disable(tu, TP_FLAG_TRACE);
+ probe_event_disable(tu, file);
return 0;
#ifdef CONFIG_PERF_EVENTS
case TRACE_REG_PERF_REGISTER:
- return probe_event_enable(tu, TP_FLAG_PROFILE, uprobe_perf_filter);
+ return probe_event_enable(tu, NULL, uprobe_perf_filter);
case TRACE_REG_PERF_UNREGISTER:
- probe_event_disable(tu, TP_FLAG_PROFILE);
+ probe_event_disable(tu, NULL);
return 0;
case TRACE_REG_PERF_OPEN:
@@ -1127,8 +1173,11 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
{
struct trace_uprobe *tu;
struct uprobe_dispatch_data udd;
+ struct uprobe_cpu_buffer *ucb;
+ int dsize, esize;
int ret = 0;
+
tu = container_of(con, struct trace_uprobe, consumer);
tu->nhit++;
@@ -1137,13 +1186,29 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
current->utask->vaddr = (unsigned long) &udd;
+#ifdef CONFIG_PERF_EVENTS
+ if ((tu->tp.flags & TP_FLAG_TRACE) == 0 &&
+ !uprobe_perf_filter(&tu->consumer, 0, current->mm))
+ return UPROBE_HANDLER_REMOVE;
+#endif
+
+ if (WARN_ON_ONCE(!uprobe_cpu_buffer))
+ return 0;
+
+ dsize = __get_data_size(&tu->tp, regs);
+ esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+ ucb = uprobe_buffer_get();
+ store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
+
if (tu->tp.flags & TP_FLAG_TRACE)
- ret |= uprobe_trace_func(tu, regs);
+ ret |= uprobe_trace_func(tu, regs, ucb, dsize);
#ifdef CONFIG_PERF_EVENTS
if (tu->tp.flags & TP_FLAG_PROFILE)
- ret |= uprobe_perf_func(tu, regs);
+ ret |= uprobe_perf_func(tu, regs, ucb, dsize);
#endif
+ uprobe_buffer_put(ucb);
return ret;
}
@@ -1152,6 +1217,8 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
{
struct trace_uprobe *tu;
struct uprobe_dispatch_data udd;
+ struct uprobe_cpu_buffer *ucb;
+ int dsize, esize;
tu = container_of(con, struct trace_uprobe, consumer);
@@ -1160,13 +1227,23 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
current->utask->vaddr = (unsigned long) &udd;
+ if (WARN_ON_ONCE(!uprobe_cpu_buffer))
+ return 0;
+
+ dsize = __get_data_size(&tu->tp, regs);
+ esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+ ucb = uprobe_buffer_get();
+ store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
+
if (tu->tp.flags & TP_FLAG_TRACE)
- uretprobe_trace_func(tu, func, regs);
+ uretprobe_trace_func(tu, func, regs, ucb, dsize);
#ifdef CONFIG_PERF_EVENTS
if (tu->tp.flags & TP_FLAG_PROFILE)
- uretprobe_perf_func(tu, func, regs);
+ uretprobe_perf_func(tu, func, regs, ucb, dsize);
#endif
+ uprobe_buffer_put(ucb);
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 18:27:59 +0000