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s390/test_unwind: add ftrace test

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Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2022-01-31 19:06:52 +01:00
parent 8a0c970550
commit 829ec7491c
1 changed files with 59 additions and 0 deletions
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59
arch/s390/lib/test_unwind.c
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@ -8,6 +8,7 @@
#include <linux/completion.h>
#include <linux/kallsyms.h>
#include <linux/kthread.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/slab.h>
@ -129,6 +130,7 @@ static struct unwindme *unwindme;
#define UWM_SWITCH_STACK 0x10 /* Use call_on_stack. */
#define UWM_IRQ 0x20 /* Unwind from irq context. */
#define UWM_PGM 0x40 /* Unwind from program check handler. */
#define UWM_FTRACE 0x80 /* Unwind from ftrace handler. */
static __always_inline unsigned long get_psw_addr(void)
{
@ -149,6 +151,57 @@ static int pgm_pre_handler(struct kprobe *p, struct pt_regs *regs)
return 0;
}
static void notrace __used test_unwind_ftrace_handler(unsigned long ip,
unsigned long parent_ip,
struct ftrace_ops *fops,
struct ftrace_regs *fregs)
{
struct unwindme *u = (struct unwindme *)fregs->regs.gprs[2];
u->ret = test_unwind(NULL, (u->flags & UWM_REGS) ? &fregs->regs : NULL,
(u->flags & UWM_SP) ? u->sp : 0);
}
static noinline int test_unwind_ftraced_func(struct unwindme *u)
{
return READ_ONCE(u)->ret;
}
static int test_unwind_ftrace(struct unwindme *u)
{
struct ftrace_ops *fops;
int ret;
#ifndef CONFIG_DYNAMIC_FTRACE
kunit_skip(current_test, "requires CONFIG_DYNAMIC_FTRACE");
fops = NULL; /* used */
#else
fops = kunit_kzalloc(current_test, sizeof(*fops), GFP_KERNEL);
fops->func = test_unwind_ftrace_handler;
fops->flags = FTRACE_OPS_FL_DYNAMIC |
FTRACE_OPS_FL_RECURSION |
FTRACE_OPS_FL_SAVE_REGS |
FTRACE_OPS_FL_PERMANENT;
#endif
ret = ftrace_set_filter_ip(fops, (unsigned long)test_unwind_ftraced_func, 0, 0);
if (ret) {
kunit_err(current_test, "failed to set ftrace filter (%d)\n", ret);
return -1;
}
ret = register_ftrace_function(fops);
if (!ret) {
ret = test_unwind_ftraced_func(u);
unregister_ftrace_function(fops);
} else {
kunit_err(current_test, "failed to register ftrace handler (%d)\n", ret);
}
ftrace_set_filter_ip(fops, (unsigned long)test_unwind_ftraced_func, 1, 0);
return ret;
}
/* This function may or may not appear in the backtrace. */
static noinline int unwindme_func4(struct unwindme *u)
{
@ -189,6 +242,8 @@ static noinline int unwindme_func4(struct unwindme *u)
unregister_kprobe(&kp);
unwindme = NULL;
return u->ret;
} else if (u->flags & UWM_FTRACE) {
return test_unwind_ftrace(u);
} else {
struct pt_regs regs;
@ -321,6 +376,10 @@ static const struct test_params param_list[] = {
TEST_WITH_FLAGS(UWM_PGM | UWM_SP),
TEST_WITH_FLAGS(UWM_PGM | UWM_REGS),
TEST_WITH_FLAGS(UWM_PGM | UWM_SP | UWM_REGS),
TEST_WITH_FLAGS(UWM_FTRACE),
TEST_WITH_FLAGS(UWM_FTRACE | UWM_SP),
TEST_WITH_FLAGS(UWM_FTRACE | UWM_REGS),
TEST_WITH_FLAGS(UWM_FTRACE | UWM_SP | UWM_REGS),
};
/*