kselftest: arm64: extend test_init functionalities

Extend signal testing framework to allow the definition of a custom per
test initialization function to be run at the end of the common test_init
after test setup phase has completed and before test-run routine.

This custom per-test initialization function also enables the test writer
to decide on its own when forcibly skip the test itself using standard KSFT
mechanism.
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

tools/testing/selftests/arm64/signal/test_signals.c

@@ -19,11 +19,11 @@ int main(int argc, char *argv[])
 	current = &tde;
 
 	ksft_print_msg("%s :: %s\n", current->name, current->descr);
-	if (test_setup(current)) {
+	if (test_setup(current) && test_init(current)) {
 		test_run(current);
-		test_result(current);
 		test_cleanup(current);
 	}
+	test_result(current);
 
-	return current->pass ? KSFT_PASS : KSFT_FAIL;
+	return current->result;
 }

tools/testing/selftests/arm64/signal/test_signals.h

@@ -68,17 +68,20 @@ struct tdescr {
 	unsigned int		timeout;
 	bool			triggered;
 	bool			pass;
+	unsigned int		result;
 	/* optional sa_flags for the installed handler */
 	int			sa_flags;
 	ucontext_t		saved_uc;
 	/* optional test private data */
 	void                    *priv;
 
-	/* a custom setup function to be called before test starts */
+	/* a custom setup: called alternatively to default_setup */
 	int (*setup)(struct tdescr *td);
+	/* a custom init: called by default test init after test_setup */
+	bool (*init)(struct tdescr *td);
 	/* a custom cleanup function called before test exits */
 	void (*cleanup)(struct tdescr *td);
-	/* an optional function to be used as a trigger for test starting */
+	/* an optional function to be used as a trigger for starting test */
 	int (*trigger)(struct tdescr *td);
 	/*
 	 * the actual test-core: invoked differently depending on the

tools/testing/selftests/arm64/signal/test_signals_utils.c

@@ -11,6 +11,8 @@
 #include <linux/auxvec.h>
 #include <ucontext.h>
 
+#include <kselftest.h>
+
 #include "test_signals.h"
 #include "test_signals_utils.h"
 #include "testcases/testcases.h"
@@ -52,12 +54,18 @@ static void unblock_signal(int signum)
 
 static void default_result(struct tdescr *td, bool force_exit)
 {
-	if (td->pass)
+	if (td->result == KSFT_SKIP) {
+		fprintf(stderr, "==>> completed. SKIP.\n");
+	} else if (td->pass) {
 		fprintf(stderr, "==>> completed. PASS(1)\n");
-	else
+		td->result = KSFT_PASS;
+	} else {
 		fprintf(stdout, "==>> completed. FAIL(0)\n");
+		td->result = KSFT_FAIL;
+	}
+
 	if (force_exit)
-		exit(td->pass ? EXIT_SUCCESS : EXIT_FAILURE);
+		exit(td->result);
 }
 
 /*
@@ -209,7 +217,7 @@ static inline int default_trigger(struct tdescr *td)
 	return !raise(td->sig_trig);
 }
 
-static int test_init(struct tdescr *td)
+int test_init(struct tdescr *td)
 {
 	td->minsigstksz = getauxval(AT_MINSIGSTKSZ);
 	if (!td->minsigstksz)
@@ -236,7 +244,14 @@ static int test_init(struct tdescr *td)
 						~td->feats_supported));
 	}
 
+	/* Perform test specific additional initialization */
+	if (td->init && !td->init(td)) {
+		fprintf(stderr, "FAILED Testcase initialization.\n");
+		return 0;
+	}
 	td->initialized = 1;
+	fprintf(stderr, "Testcase initialized.\n");
+
 	return 1;
 }
 
@@ -248,9 +263,8 @@ int test_setup(struct tdescr *td)
 	assert(td->name);
 	assert(td->run);
 
-	if (!test_init(td))
-		return 0;
-
+	/* Default result is FAIL if test setup fails */
+	td->result = KSFT_FAIL;
 	if (td->setup)
 		return td->setup(td);
 	else
@@ -271,7 +285,7 @@ int test_run(struct tdescr *td)
 
 void test_result(struct tdescr *td)
 {
-	if (td->check_result)
+	if (td->initialized && td->result != KSFT_SKIP && td->check_result)
 		td->check_result(td);
 	default_result(td, 0);
 }

tools/testing/selftests/arm64/signal/test_signals_utils.h

@@ -6,6 +6,7 @@
 
 #include "test_signals.h"
 
+int test_init(struct tdescr *td);
 int test_setup(struct tdescr *td);
 void test_cleanup(struct tdescr *td);
 int test_run(struct tdescr *td);