// SPDX-License-Identifier: GPL-2.0
|
/* Include in trace.c */
|
|
#include <uapi/linux/sched/types.h>
|
#include <linux/stringify.h>
|
#include <linux/kthread.h>
|
#include <linux/delay.h>
|
#include <linux/slab.h>
|
|
static inline int trace_valid_entry(struct trace_entry *entry)
|
{
|
switch (entry->type) {
|
case TRACE_FN:
|
case TRACE_CTX:
|
case TRACE_WAKE:
|
case TRACE_STACK:
|
case TRACE_PRINT:
|
case TRACE_BRANCH:
|
case TRACE_GRAPH_ENT:
|
case TRACE_GRAPH_RET:
|
return 1;
|
}
|
return 0;
|
}
|
|
static int trace_test_buffer_cpu(struct array_buffer *buf, int cpu)
|
{
|
struct ring_buffer_event *event;
|
struct trace_entry *entry;
|
unsigned int loops = 0;
|
|
while ((event = ring_buffer_consume(buf->buffer, cpu, NULL, NULL))) {
|
entry = ring_buffer_event_data(event);
|
|
/*
|
* The ring buffer is a size of trace_buf_size, if
|
* we loop more than the size, there's something wrong
|
* with the ring buffer.
|
*/
|
if (loops++ > trace_buf_size) {
|
printk(KERN_CONT ".. bad ring buffer ");
|
goto failed;
|
}
|
if (!trace_valid_entry(entry)) {
|
printk(KERN_CONT ".. invalid entry %d ",
|
entry->type);
|
goto failed;
|
}
|
}
|
return 0;
|
|
failed:
|
/* disable tracing */
|
tracing_disabled = 1;
|
printk(KERN_CONT ".. corrupted trace buffer .. ");
|
return -1;
|
}
|
|
/*
|
* Test the trace buffer to see if all the elements
|
* are still sane.
|
*/
|
static int __maybe_unused trace_test_buffer(struct array_buffer *buf, unsigned long *count)
|
{
|
unsigned long flags, cnt = 0;
|
int cpu, ret = 0;
|
|
/* Don't allow flipping of max traces now */
|
local_irq_save(flags);
|
arch_spin_lock(&buf->tr->max_lock);
|
|
cnt = ring_buffer_entries(buf->buffer);
|
|
/*
|
* The trace_test_buffer_cpu runs a while loop to consume all data.
|
* If the calling tracer is broken, and is constantly filling
|
* the buffer, this will run forever, and hard lock the box.
|
* We disable the ring buffer while we do this test to prevent
|
* a hard lock up.
|
*/
|
tracing_off();
|
for_each_possible_cpu(cpu) {
|
ret = trace_test_buffer_cpu(buf, cpu);
|
if (ret)
|
break;
|
}
|
tracing_on();
|
arch_spin_unlock(&buf->tr->max_lock);
|
local_irq_restore(flags);
|
|
if (count)
|
*count = cnt;
|
|
return ret;
|
}
|
|
static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
|
{
|
printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n",
|
trace->name, init_ret);
|
}
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
static int trace_selftest_test_probe1_cnt;
|
static void trace_selftest_test_probe1_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
trace_selftest_test_probe1_cnt++;
|
}
|
|
static int trace_selftest_test_probe2_cnt;
|
static void trace_selftest_test_probe2_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
trace_selftest_test_probe2_cnt++;
|
}
|
|
static int trace_selftest_test_probe3_cnt;
|
static void trace_selftest_test_probe3_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
trace_selftest_test_probe3_cnt++;
|
}
|
|
static int trace_selftest_test_global_cnt;
|
static void trace_selftest_test_global_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
trace_selftest_test_global_cnt++;
|
}
|
|
static int trace_selftest_test_dyn_cnt;
|
static void trace_selftest_test_dyn_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
trace_selftest_test_dyn_cnt++;
|
}
|
|
static struct ftrace_ops test_probe1 = {
|
.func = trace_selftest_test_probe1_func,
|
.flags = FTRACE_OPS_FL_RECURSION_SAFE,
|
};
|
|
static struct ftrace_ops test_probe2 = {
|
.func = trace_selftest_test_probe2_func,
|
.flags = FTRACE_OPS_FL_RECURSION_SAFE,
|
};
|
|
static struct ftrace_ops test_probe3 = {
|
.func = trace_selftest_test_probe3_func,
|
.flags = FTRACE_OPS_FL_RECURSION_SAFE,
|
};
|
|
static void print_counts(void)
|
{
|
printk("(%d %d %d %d %d) ",
|
trace_selftest_test_probe1_cnt,
|
trace_selftest_test_probe2_cnt,
|
trace_selftest_test_probe3_cnt,
|
trace_selftest_test_global_cnt,
|
trace_selftest_test_dyn_cnt);
|
}
|
|
static void reset_counts(void)
|
{
|
trace_selftest_test_probe1_cnt = 0;
|
trace_selftest_test_probe2_cnt = 0;
|
trace_selftest_test_probe3_cnt = 0;
|
trace_selftest_test_global_cnt = 0;
|
trace_selftest_test_dyn_cnt = 0;
|
}
|
|
static int trace_selftest_ops(struct trace_array *tr, int cnt)
|
{
|
int save_ftrace_enabled = ftrace_enabled;
|
struct ftrace_ops *dyn_ops;
|
char *func1_name;
|
char *func2_name;
|
int len1;
|
int len2;
|
int ret = -1;
|
|
printk(KERN_CONT "PASSED\n");
|
pr_info("Testing dynamic ftrace ops #%d: ", cnt);
|
|
ftrace_enabled = 1;
|
reset_counts();
|
|
/* Handle PPC64 '.' name */
|
func1_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
|
func2_name = "*" __stringify(DYN_FTRACE_TEST_NAME2);
|
len1 = strlen(func1_name);
|
len2 = strlen(func2_name);
|
|
/*
|
* Probe 1 will trace function 1.
|
* Probe 2 will trace function 2.
|
* Probe 3 will trace functions 1 and 2.
|
*/
|
ftrace_set_filter(&test_probe1, func1_name, len1, 1);
|
ftrace_set_filter(&test_probe2, func2_name, len2, 1);
|
ftrace_set_filter(&test_probe3, func1_name, len1, 1);
|
ftrace_set_filter(&test_probe3, func2_name, len2, 0);
|
|
register_ftrace_function(&test_probe1);
|
register_ftrace_function(&test_probe2);
|
register_ftrace_function(&test_probe3);
|
/* First time we are running with main function */
|
if (cnt > 1) {
|
ftrace_init_array_ops(tr, trace_selftest_test_global_func);
|
register_ftrace_function(tr->ops);
|
}
|
|
DYN_FTRACE_TEST_NAME();
|
|
print_counts();
|
|
if (trace_selftest_test_probe1_cnt != 1)
|
goto out;
|
if (trace_selftest_test_probe2_cnt != 0)
|
goto out;
|
if (trace_selftest_test_probe3_cnt != 1)
|
goto out;
|
if (cnt > 1) {
|
if (trace_selftest_test_global_cnt == 0)
|
goto out;
|
}
|
|
DYN_FTRACE_TEST_NAME2();
|
|
print_counts();
|
|
if (trace_selftest_test_probe1_cnt != 1)
|
goto out;
|
if (trace_selftest_test_probe2_cnt != 1)
|
goto out;
|
if (trace_selftest_test_probe3_cnt != 2)
|
goto out;
|
|
/* Add a dynamic probe */
|
dyn_ops = kzalloc(sizeof(*dyn_ops), GFP_KERNEL);
|
if (!dyn_ops) {
|
printk("MEMORY ERROR ");
|
goto out;
|
}
|
|
dyn_ops->func = trace_selftest_test_dyn_func;
|
|
register_ftrace_function(dyn_ops);
|
|
trace_selftest_test_global_cnt = 0;
|
|
DYN_FTRACE_TEST_NAME();
|
|
print_counts();
|
|
if (trace_selftest_test_probe1_cnt != 2)
|
goto out_free;
|
if (trace_selftest_test_probe2_cnt != 1)
|
goto out_free;
|
if (trace_selftest_test_probe3_cnt != 3)
|
goto out_free;
|
if (cnt > 1) {
|
if (trace_selftest_test_global_cnt == 0)
|
goto out_free;
|
}
|
if (trace_selftest_test_dyn_cnt == 0)
|
goto out_free;
|
|
DYN_FTRACE_TEST_NAME2();
|
|
print_counts();
|
|
if (trace_selftest_test_probe1_cnt != 2)
|
goto out_free;
|
if (trace_selftest_test_probe2_cnt != 2)
|
goto out_free;
|
if (trace_selftest_test_probe3_cnt != 4)
|
goto out_free;
|
|
ret = 0;
|
out_free:
|
unregister_ftrace_function(dyn_ops);
|
kfree(dyn_ops);
|
|
out:
|
/* Purposely unregister in the same order */
|
unregister_ftrace_function(&test_probe1);
|
unregister_ftrace_function(&test_probe2);
|
unregister_ftrace_function(&test_probe3);
|
if (cnt > 1)
|
unregister_ftrace_function(tr->ops);
|
ftrace_reset_array_ops(tr);
|
|
/* Make sure everything is off */
|
reset_counts();
|
DYN_FTRACE_TEST_NAME();
|
DYN_FTRACE_TEST_NAME();
|
|
if (trace_selftest_test_probe1_cnt ||
|
trace_selftest_test_probe2_cnt ||
|
trace_selftest_test_probe3_cnt ||
|
trace_selftest_test_global_cnt ||
|
trace_selftest_test_dyn_cnt)
|
ret = -1;
|
|
ftrace_enabled = save_ftrace_enabled;
|
|
return ret;
|
}
|
|
/* Test dynamic code modification and ftrace filters */
|
static int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
|
struct trace_array *tr,
|
int (*func)(void))
|
{
|
int save_ftrace_enabled = ftrace_enabled;
|
unsigned long count;
|
char *func_name;
|
int ret;
|
|
/* The ftrace test PASSED */
|
printk(KERN_CONT "PASSED\n");
|
pr_info("Testing dynamic ftrace: ");
|
|
/* enable tracing, and record the filter function */
|
ftrace_enabled = 1;
|
|
/* passed in by parameter to fool gcc from optimizing */
|
func();
|
|
/*
|
* Some archs *cough*PowerPC*cough* add characters to the
|
* start of the function names. We simply put a '*' to
|
* accommodate them.
|
*/
|
func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
|
|
/* filter only on our function */
|
ftrace_set_global_filter(func_name, strlen(func_name), 1);
|
|
/* enable tracing */
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
goto out;
|
}
|
|
/* Sleep for a 1/10 of a second */
|
msleep(100);
|
|
/* we should have nothing in the buffer */
|
ret = trace_test_buffer(&tr->array_buffer, &count);
|
if (ret)
|
goto out;
|
|
if (count) {
|
ret = -1;
|
printk(KERN_CONT ".. filter did not filter .. ");
|
goto out;
|
}
|
|
/* call our function again */
|
func();
|
|
/* sleep again */
|
msleep(100);
|
|
/* stop the tracing. */
|
tracing_stop();
|
ftrace_enabled = 0;
|
|
/* check the trace buffer */
|
ret = trace_test_buffer(&tr->array_buffer, &count);
|
|
ftrace_enabled = 1;
|
tracing_start();
|
|
/* we should only have one item */
|
if (!ret && count != 1) {
|
trace->reset(tr);
|
printk(KERN_CONT ".. filter failed count=%ld ..", count);
|
ret = -1;
|
goto out;
|
}
|
|
/* Test the ops with global tracing running */
|
ret = trace_selftest_ops(tr, 1);
|
trace->reset(tr);
|
|
out:
|
ftrace_enabled = save_ftrace_enabled;
|
|
/* Enable tracing on all functions again */
|
ftrace_set_global_filter(NULL, 0, 1);
|
|
/* Test the ops with global tracing off */
|
if (!ret)
|
ret = trace_selftest_ops(tr, 2);
|
|
return ret;
|
}
|
|
static int trace_selftest_recursion_cnt;
|
static void trace_selftest_test_recursion_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
/*
|
* This function is registered without the recursion safe flag.
|
* The ftrace infrastructure should provide the recursion
|
* protection. If not, this will crash the kernel!
|
*/
|
if (trace_selftest_recursion_cnt++ > 10)
|
return;
|
DYN_FTRACE_TEST_NAME();
|
}
|
|
static void trace_selftest_test_recursion_safe_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
/*
|
* We said we would provide our own recursion. By calling
|
* this function again, we should recurse back into this function
|
* and count again. But this only happens if the arch supports
|
* all of ftrace features and nothing else is using the function
|
* tracing utility.
|
*/
|
if (trace_selftest_recursion_cnt++)
|
return;
|
DYN_FTRACE_TEST_NAME();
|
}
|
|
static struct ftrace_ops test_rec_probe = {
|
.func = trace_selftest_test_recursion_func,
|
};
|
|
static struct ftrace_ops test_recsafe_probe = {
|
.func = trace_selftest_test_recursion_safe_func,
|
.flags = FTRACE_OPS_FL_RECURSION_SAFE,
|
};
|
|
static int
|
trace_selftest_function_recursion(void)
|
{
|
int save_ftrace_enabled = ftrace_enabled;
|
char *func_name;
|
int len;
|
int ret;
|
|
/* The previous test PASSED */
|
pr_cont("PASSED\n");
|
pr_info("Testing ftrace recursion: ");
|
|
|
/* enable tracing, and record the filter function */
|
ftrace_enabled = 1;
|
|
/* Handle PPC64 '.' name */
|
func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
|
len = strlen(func_name);
|
|
ret = ftrace_set_filter(&test_rec_probe, func_name, len, 1);
|
if (ret) {
|
pr_cont("*Could not set filter* ");
|
goto out;
|
}
|
|
ret = register_ftrace_function(&test_rec_probe);
|
if (ret) {
|
pr_cont("*could not register callback* ");
|
goto out;
|
}
|
|
DYN_FTRACE_TEST_NAME();
|
|
unregister_ftrace_function(&test_rec_probe);
|
|
ret = -1;
|
/*
|
* Recursion allows for transitions between context,
|
* and may call the callback twice.
|
*/
|
if (trace_selftest_recursion_cnt != 1 &&
|
trace_selftest_recursion_cnt != 2) {
|
pr_cont("*callback not called once (or twice) (%d)* ",
|
trace_selftest_recursion_cnt);
|
goto out;
|
}
|
|
trace_selftest_recursion_cnt = 1;
|
|
pr_cont("PASSED\n");
|
pr_info("Testing ftrace recursion safe: ");
|
|
ret = ftrace_set_filter(&test_recsafe_probe, func_name, len, 1);
|
if (ret) {
|
pr_cont("*Could not set filter* ");
|
goto out;
|
}
|
|
ret = register_ftrace_function(&test_recsafe_probe);
|
if (ret) {
|
pr_cont("*could not register callback* ");
|
goto out;
|
}
|
|
DYN_FTRACE_TEST_NAME();
|
|
unregister_ftrace_function(&test_recsafe_probe);
|
|
ret = -1;
|
if (trace_selftest_recursion_cnt != 2) {
|
pr_cont("*callback not called expected 2 times (%d)* ",
|
trace_selftest_recursion_cnt);
|
goto out;
|
}
|
|
ret = 0;
|
out:
|
ftrace_enabled = save_ftrace_enabled;
|
|
return ret;
|
}
|
#else
|
# define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; })
|
# define trace_selftest_function_recursion() ({ 0; })
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
static enum {
|
TRACE_SELFTEST_REGS_START,
|
TRACE_SELFTEST_REGS_FOUND,
|
TRACE_SELFTEST_REGS_NOT_FOUND,
|
} trace_selftest_regs_stat;
|
|
static void trace_selftest_test_regs_func(unsigned long ip,
|
unsigned long pip,
|
struct ftrace_ops *op,
|
struct pt_regs *pt_regs)
|
{
|
if (pt_regs)
|
trace_selftest_regs_stat = TRACE_SELFTEST_REGS_FOUND;
|
else
|
trace_selftest_regs_stat = TRACE_SELFTEST_REGS_NOT_FOUND;
|
}
|
|
static struct ftrace_ops test_regs_probe = {
|
.func = trace_selftest_test_regs_func,
|
.flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_SAVE_REGS,
|
};
|
|
static int
|
trace_selftest_function_regs(void)
|
{
|
int save_ftrace_enabled = ftrace_enabled;
|
char *func_name;
|
int len;
|
int ret;
|
int supported = 0;
|
|
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
|
supported = 1;
|
#endif
|
|
/* The previous test PASSED */
|
pr_cont("PASSED\n");
|
pr_info("Testing ftrace regs%s: ",
|
!supported ? "(no arch support)" : "");
|
|
/* enable tracing, and record the filter function */
|
ftrace_enabled = 1;
|
|
/* Handle PPC64 '.' name */
|
func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
|
len = strlen(func_name);
|
|
ret = ftrace_set_filter(&test_regs_probe, func_name, len, 1);
|
/*
|
* If DYNAMIC_FTRACE is not set, then we just trace all functions.
|
* This test really doesn't care.
|
*/
|
if (ret && ret != -ENODEV) {
|
pr_cont("*Could not set filter* ");
|
goto out;
|
}
|
|
ret = register_ftrace_function(&test_regs_probe);
|
/*
|
* Now if the arch does not support passing regs, then this should
|
* have failed.
|
*/
|
if (!supported) {
|
if (!ret) {
|
pr_cont("*registered save-regs without arch support* ");
|
goto out;
|
}
|
test_regs_probe.flags |= FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED;
|
ret = register_ftrace_function(&test_regs_probe);
|
}
|
if (ret) {
|
pr_cont("*could not register callback* ");
|
goto out;
|
}
|
|
|
DYN_FTRACE_TEST_NAME();
|
|
unregister_ftrace_function(&test_regs_probe);
|
|
ret = -1;
|
|
switch (trace_selftest_regs_stat) {
|
case TRACE_SELFTEST_REGS_START:
|
pr_cont("*callback never called* ");
|
goto out;
|
|
case TRACE_SELFTEST_REGS_FOUND:
|
if (supported)
|
break;
|
pr_cont("*callback received regs without arch support* ");
|
goto out;
|
|
case TRACE_SELFTEST_REGS_NOT_FOUND:
|
if (!supported)
|
break;
|
pr_cont("*callback received NULL regs* ");
|
goto out;
|
}
|
|
ret = 0;
|
out:
|
ftrace_enabled = save_ftrace_enabled;
|
|
return ret;
|
}
|
|
/*
|
* Simple verification test of ftrace function tracer.
|
* Enable ftrace, sleep 1/10 second, and then read the trace
|
* buffer to see if all is in order.
|
*/
|
__init int
|
trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
|
{
|
int save_ftrace_enabled = ftrace_enabled;
|
unsigned long count;
|
int ret;
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
if (ftrace_filter_param) {
|
printk(KERN_CONT " ... kernel command line filter set: force PASS ... ");
|
return 0;
|
}
|
#endif
|
|
/* make sure msleep has been recorded */
|
msleep(1);
|
|
/* start the tracing */
|
ftrace_enabled = 1;
|
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
goto out;
|
}
|
|
/* Sleep for a 1/10 of a second */
|
msleep(100);
|
/* stop the tracing. */
|
tracing_stop();
|
ftrace_enabled = 0;
|
|
/* check the trace buffer */
|
ret = trace_test_buffer(&tr->array_buffer, &count);
|
|
ftrace_enabled = 1;
|
trace->reset(tr);
|
tracing_start();
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
goto out;
|
}
|
|
ret = trace_selftest_startup_dynamic_tracing(trace, tr,
|
DYN_FTRACE_TEST_NAME);
|
if (ret)
|
goto out;
|
|
ret = trace_selftest_function_recursion();
|
if (ret)
|
goto out;
|
|
ret = trace_selftest_function_regs();
|
out:
|
ftrace_enabled = save_ftrace_enabled;
|
|
/* kill ftrace totally if we failed */
|
if (ret)
|
ftrace_kill();
|
|
return ret;
|
}
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
/* Maximum number of functions to trace before diagnosing a hang */
|
#define GRAPH_MAX_FUNC_TEST 100000000
|
|
static unsigned int graph_hang_thresh;
|
|
/* Wrap the real function entry probe to avoid possible hanging */
|
static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace)
|
{
|
/* This is harmlessly racy, we want to approximately detect a hang */
|
if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) {
|
ftrace_graph_stop();
|
printk(KERN_WARNING "BUG: Function graph tracer hang!\n");
|
if (ftrace_dump_on_oops) {
|
ftrace_dump(DUMP_ALL);
|
/* ftrace_dump() disables tracing */
|
tracing_on();
|
}
|
return 0;
|
}
|
|
return trace_graph_entry(trace);
|
}
|
|
static struct fgraph_ops fgraph_ops __initdata = {
|
.entryfunc = &trace_graph_entry_watchdog,
|
.retfunc = &trace_graph_return,
|
};
|
|
/*
|
* Pretty much the same than for the function tracer from which the selftest
|
* has been borrowed.
|
*/
|
__init int
|
trace_selftest_startup_function_graph(struct tracer *trace,
|
struct trace_array *tr)
|
{
|
int ret;
|
unsigned long count;
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
if (ftrace_filter_param) {
|
printk(KERN_CONT " ... kernel command line filter set: force PASS ... ");
|
return 0;
|
}
|
#endif
|
|
/*
|
* Simulate the init() callback but we attach a watchdog callback
|
* to detect and recover from possible hangs
|
*/
|
tracing_reset_online_cpus(&tr->array_buffer);
|
set_graph_array(tr);
|
ret = register_ftrace_graph(&fgraph_ops);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
goto out;
|
}
|
tracing_start_cmdline_record();
|
|
/* Sleep for a 1/10 of a second */
|
msleep(100);
|
|
/* Have we just recovered from a hang? */
|
if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) {
|
disable_tracing_selftest("recovering from a hang");
|
ret = -1;
|
goto out;
|
}
|
|
tracing_stop();
|
|
/* check the trace buffer */
|
ret = trace_test_buffer(&tr->array_buffer, &count);
|
|
/* Need to also simulate the tr->reset to remove this fgraph_ops */
|
tracing_stop_cmdline_record();
|
unregister_ftrace_graph(&fgraph_ops);
|
|
tracing_start();
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
goto out;
|
}
|
|
/* Don't test dynamic tracing, the function tracer already did */
|
|
out:
|
/* Stop it if we failed */
|
if (ret)
|
ftrace_graph_stop();
|
|
return ret;
|
}
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
int
|
trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
|
{
|
unsigned long save_max = tr->max_latency;
|
unsigned long count;
|
int ret;
|
|
/* start the tracing */
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
return ret;
|
}
|
|
/* reset the max latency */
|
tr->max_latency = 0;
|
/* disable interrupts for a bit */
|
local_irq_disable();
|
udelay(100);
|
local_irq_enable();
|
|
/*
|
* Stop the tracer to avoid a warning subsequent
|
* to buffer flipping failure because tracing_stop()
|
* disables the tr and max buffers, making flipping impossible
|
* in case of parallels max irqs off latencies.
|
*/
|
trace->stop(tr);
|
/* stop the tracing. */
|
tracing_stop();
|
/* check both trace buffers */
|
ret = trace_test_buffer(&tr->array_buffer, NULL);
|
if (!ret)
|
ret = trace_test_buffer(&tr->max_buffer, &count);
|
trace->reset(tr);
|
tracing_start();
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
}
|
|
tr->max_latency = save_max;
|
|
return ret;
|
}
|
#endif /* CONFIG_IRQSOFF_TRACER */
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
int
|
trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
|
{
|
unsigned long save_max = tr->max_latency;
|
unsigned long count;
|
int ret;
|
|
/*
|
* Now that the big kernel lock is no longer preemptable,
|
* and this is called with the BKL held, it will always
|
* fail. If preemption is already disabled, simply
|
* pass the test. When the BKL is removed, or becomes
|
* preemptible again, we will once again test this,
|
* so keep it in.
|
*/
|
if (preempt_count()) {
|
printk(KERN_CONT "can not test ... force ");
|
return 0;
|
}
|
|
/* start the tracing */
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
return ret;
|
}
|
|
/* reset the max latency */
|
tr->max_latency = 0;
|
/* disable preemption for a bit */
|
preempt_disable();
|
udelay(100);
|
preempt_enable();
|
|
/*
|
* Stop the tracer to avoid a warning subsequent
|
* to buffer flipping failure because tracing_stop()
|
* disables the tr and max buffers, making flipping impossible
|
* in case of parallels max preempt off latencies.
|
*/
|
trace->stop(tr);
|
/* stop the tracing. */
|
tracing_stop();
|
/* check both trace buffers */
|
ret = trace_test_buffer(&tr->array_buffer, NULL);
|
if (!ret)
|
ret = trace_test_buffer(&tr->max_buffer, &count);
|
trace->reset(tr);
|
tracing_start();
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
}
|
|
tr->max_latency = save_max;
|
|
return ret;
|
}
|
#endif /* CONFIG_PREEMPT_TRACER */
|
|
#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
|
int
|
trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr)
|
{
|
unsigned long save_max = tr->max_latency;
|
unsigned long count;
|
int ret;
|
|
/*
|
* Now that the big kernel lock is no longer preemptable,
|
* and this is called with the BKL held, it will always
|
* fail. If preemption is already disabled, simply
|
* pass the test. When the BKL is removed, or becomes
|
* preemptible again, we will once again test this,
|
* so keep it in.
|
*/
|
if (preempt_count()) {
|
printk(KERN_CONT "can not test ... force ");
|
return 0;
|
}
|
|
/* start the tracing */
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
goto out_no_start;
|
}
|
|
/* reset the max latency */
|
tr->max_latency = 0;
|
|
/* disable preemption and interrupts for a bit */
|
preempt_disable();
|
local_irq_disable();
|
udelay(100);
|
preempt_enable();
|
/* reverse the order of preempt vs irqs */
|
local_irq_enable();
|
|
/*
|
* Stop the tracer to avoid a warning subsequent
|
* to buffer flipping failure because tracing_stop()
|
* disables the tr and max buffers, making flipping impossible
|
* in case of parallels max irqs/preempt off latencies.
|
*/
|
trace->stop(tr);
|
/* stop the tracing. */
|
tracing_stop();
|
/* check both trace buffers */
|
ret = trace_test_buffer(&tr->array_buffer, NULL);
|
if (ret)
|
goto out;
|
|
ret = trace_test_buffer(&tr->max_buffer, &count);
|
if (ret)
|
goto out;
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
goto out;
|
}
|
|
/* do the test by disabling interrupts first this time */
|
tr->max_latency = 0;
|
tracing_start();
|
trace->start(tr);
|
|
preempt_disable();
|
local_irq_disable();
|
udelay(100);
|
preempt_enable();
|
/* reverse the order of preempt vs irqs */
|
local_irq_enable();
|
|
trace->stop(tr);
|
/* stop the tracing. */
|
tracing_stop();
|
/* check both trace buffers */
|
ret = trace_test_buffer(&tr->array_buffer, NULL);
|
if (ret)
|
goto out;
|
|
ret = trace_test_buffer(&tr->max_buffer, &count);
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
goto out;
|
}
|
|
out:
|
tracing_start();
|
out_no_start:
|
trace->reset(tr);
|
tr->max_latency = save_max;
|
|
return ret;
|
}
|
#endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */
|
|
#ifdef CONFIG_NOP_TRACER
|
int
|
trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
|
{
|
/* What could possibly go wrong? */
|
return 0;
|
}
|
#endif
|
|
#ifdef CONFIG_SCHED_TRACER
|
|
struct wakeup_test_data {
|
struct completion is_ready;
|
int go;
|
};
|
|
static int trace_wakeup_test_thread(void *data)
|
{
|
/* Make this a -deadline thread */
|
static const struct sched_attr attr = {
|
.sched_policy = SCHED_DEADLINE,
|
.sched_runtime = 100000ULL,
|
.sched_deadline = 10000000ULL,
|
.sched_period = 10000000ULL
|
};
|
struct wakeup_test_data *x = data;
|
|
sched_setattr(current, &attr);
|
|
/* Make it know we have a new prio */
|
complete(&x->is_ready);
|
|
/* now go to sleep and let the test wake us up */
|
set_current_state(TASK_INTERRUPTIBLE);
|
while (!x->go) {
|
schedule();
|
set_current_state(TASK_INTERRUPTIBLE);
|
}
|
|
complete(&x->is_ready);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
/* we are awake, now wait to disappear */
|
while (!kthread_should_stop()) {
|
schedule();
|
set_current_state(TASK_INTERRUPTIBLE);
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
return 0;
|
}
|
int
|
trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
|
{
|
unsigned long save_max = tr->max_latency;
|
struct task_struct *p;
|
struct wakeup_test_data data;
|
unsigned long count;
|
int ret;
|
|
memset(&data, 0, sizeof(data));
|
|
init_completion(&data.is_ready);
|
|
/* create a -deadline thread */
|
p = kthread_run(trace_wakeup_test_thread, &data, "ftrace-test");
|
if (IS_ERR(p)) {
|
printk(KERN_CONT "Failed to create ftrace wakeup test thread ");
|
return -1;
|
}
|
|
/* make sure the thread is running at -deadline policy */
|
wait_for_completion(&data.is_ready);
|
|
/* start the tracing */
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
return ret;
|
}
|
|
/* reset the max latency */
|
tr->max_latency = 0;
|
|
while (p->on_rq) {
|
/*
|
* Sleep to make sure the -deadline thread is asleep too.
|
* On virtual machines we can't rely on timings,
|
* but we want to make sure this test still works.
|
*/
|
msleep(100);
|
}
|
|
init_completion(&data.is_ready);
|
|
data.go = 1;
|
/* memory barrier is in the wake_up_process() */
|
|
wake_up_process(p);
|
|
/* Wait for the task to wake up */
|
wait_for_completion(&data.is_ready);
|
|
/* stop the tracing. */
|
tracing_stop();
|
/* check both trace buffers */
|
ret = trace_test_buffer(&tr->array_buffer, NULL);
|
if (!ret)
|
ret = trace_test_buffer(&tr->max_buffer, &count);
|
|
|
trace->reset(tr);
|
tracing_start();
|
|
tr->max_latency = save_max;
|
|
/* kill the thread */
|
kthread_stop(p);
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
}
|
|
return ret;
|
}
|
#endif /* CONFIG_SCHED_TRACER */
|
|
#ifdef CONFIG_BRANCH_TRACER
|
int
|
trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
|
{
|
unsigned long count;
|
int ret;
|
|
/* start the tracing */
|
ret = tracer_init(trace, tr);
|
if (ret) {
|
warn_failed_init_tracer(trace, ret);
|
return ret;
|
}
|
|
/* Sleep for a 1/10 of a second */
|
msleep(100);
|
/* stop the tracing. */
|
tracing_stop();
|
/* check the trace buffer */
|
ret = trace_test_buffer(&tr->array_buffer, &count);
|
trace->reset(tr);
|
tracing_start();
|
|
if (!ret && !count) {
|
printk(KERN_CONT ".. no entries found ..");
|
ret = -1;
|
}
|
|
return ret;
|
}
|
#endif /* CONFIG_BRANCH_TRACER */
|
