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Diffstat (limited to 'lib/test_fprobe.c')
-rw-r--r--lib/test_fprobe.c105
1 files changed, 103 insertions, 2 deletions
diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c
index fd6153800e56..079435a2e26c 100644
--- a/lib/test_fprobe.c
+++ b/lib/test_fprobe.c
@@ -17,8 +17,11 @@ static u32 rand1, entry_val, exit_val;
/* Use indirect calls to avoid inlining the target functions */
static u32 (*target)(u32 value);
static u32 (*target2)(u32 value);
+static u32 (*target_nest)(u32 value, u32 (*nest)(u32));
static unsigned long target_ip;
static unsigned long target2_ip;
+static unsigned long target_nest_ip;
+static int entry_return_value;
static noinline u32 fprobe_selftest_target(u32 value)
{
@@ -30,16 +33,31 @@ static noinline u32 fprobe_selftest_target2(u32 value)
return (value / div_factor) + 1;
}
-static notrace void fp_entry_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
+static noinline u32 fprobe_selftest_nest_target(u32 value, u32 (*nest)(u32))
+{
+ return nest(value + 2);
+}
+
+static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
{
KUNIT_EXPECT_FALSE(current_test, preemptible());
/* This can be called on the fprobe_selftest_target and the fprobe_selftest_target2 */
if (ip != target_ip)
KUNIT_EXPECT_EQ(current_test, ip, target2_ip);
entry_val = (rand1 / div_factor);
+ if (fp->entry_data_size) {
+ KUNIT_EXPECT_NOT_NULL(current_test, data);
+ if (data)
+ *(u32 *)data = entry_val;
+ } else
+ KUNIT_EXPECT_NULL(current_test, data);
+
+ return entry_return_value;
}
-static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
+static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
{
unsigned long ret = regs_return_value(regs);
@@ -51,6 +69,26 @@ static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip, struct
KUNIT_EXPECT_EQ(current_test, ret, (rand1 / div_factor));
KUNIT_EXPECT_EQ(current_test, entry_val, (rand1 / div_factor));
exit_val = entry_val + div_factor;
+ if (fp->entry_data_size) {
+ KUNIT_EXPECT_NOT_NULL(current_test, data);
+ if (data)
+ KUNIT_EXPECT_EQ(current_test, *(u32 *)data, entry_val);
+ } else
+ KUNIT_EXPECT_NULL(current_test, data);
+}
+
+static notrace int nest_entry_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
+{
+ KUNIT_EXPECT_FALSE(current_test, preemptible());
+ return 0;
+}
+
+static notrace void nest_exit_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
+{
+ KUNIT_EXPECT_FALSE(current_test, preemptible());
+ KUNIT_EXPECT_EQ(current_test, ip, target_nest_ip);
}
/* Test entry only (no rethook) */
@@ -132,6 +170,64 @@ static void test_fprobe_syms(struct kunit *test)
KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
}
+/* Test private entry_data */
+static void test_fprobe_data(struct kunit *test)
+{
+ struct fprobe fp = {
+ .entry_handler = fp_entry_handler,
+ .exit_handler = fp_exit_handler,
+ .entry_data_size = sizeof(u32),
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe(&fp, "fprobe_selftest_target", NULL));
+
+ target(rand1);
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
+/* Test nr_maxactive */
+static void test_fprobe_nest(struct kunit *test)
+{
+ static const char *syms[] = {"fprobe_selftest_target", "fprobe_selftest_nest_target"};
+ struct fprobe fp = {
+ .entry_handler = nest_entry_handler,
+ .exit_handler = nest_exit_handler,
+ .nr_maxactive = 1,
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe_syms(&fp, syms, 2));
+
+ target_nest(rand1, target);
+ KUNIT_EXPECT_EQ(test, 1, fp.nmissed);
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
+static void test_fprobe_skip(struct kunit *test)
+{
+ struct fprobe fp = {
+ .entry_handler = fp_entry_handler,
+ .exit_handler = fp_exit_handler,
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe(&fp, "fprobe_selftest_target", NULL));
+
+ entry_return_value = 1;
+ entry_val = 0;
+ exit_val = 0;
+ target(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, 0, exit_val);
+ KUNIT_EXPECT_EQ(test, 0, fp.nmissed);
+ entry_return_value = 0;
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
static unsigned long get_ftrace_location(void *func)
{
unsigned long size, addr = (unsigned long)func;
@@ -147,8 +243,10 @@ static int fprobe_test_init(struct kunit *test)
rand1 = get_random_u32_above(div_factor);
target = fprobe_selftest_target;
target2 = fprobe_selftest_target2;
+ target_nest = fprobe_selftest_nest_target;
target_ip = get_ftrace_location(target);
target2_ip = get_ftrace_location(target2);
+ target_nest_ip = get_ftrace_location(target_nest);
return 0;
}
@@ -157,6 +255,9 @@ static struct kunit_case fprobe_testcases[] = {
KUNIT_CASE(test_fprobe_entry),
KUNIT_CASE(test_fprobe),
KUNIT_CASE(test_fprobe_syms),
+ KUNIT_CASE(test_fprobe_data),
+ KUNIT_CASE(test_fprobe_nest),
+ KUNIT_CASE(test_fprobe_skip),
{}
};