[PATCH v2 24/24] kselftest/arm64: fp-ptrace: Adjust to new inactive mode behaviour

[Mark Rutland]

In order to fix an ABI problem, we recently changed the way that reads
of the NT_ARM_SVE and NT_ARM_SSVE regsets behave when their
corresponding vector state is inactive.

Update the fp-ptrace test for the new behaviour.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: David Spickett <david.spickett at arm.com>
Cc: Luis Machado <luis.machado at arm.com>
Cc: Marc Zyngier <maz at kernel.org>
Cc: Mark Brown <broonie at kernel.org>
Cc: Will Deacon <will at kernel.org>
---
 tools/testing/selftests/arm64/fp/fp-ptrace.c | 30 ++++++++++++++------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/arm64/fp/fp-ptrace.c b/tools/testing/selftests/arm64/fp/fp-ptrace.c
index c2882a5a5cc0a..191c47ca0ed80 100644
--- a/tools/testing/selftests/arm64/fp/fp-ptrace.c
+++ b/tools/testing/selftests/arm64/fp/fp-ptrace.c
@@ -439,10 +439,17 @@ static bool check_ptrace_values_sve(pid_t child, struct test_config *config)
 		pass = false;
 	}
 
-	if (sve->size != SVE_PT_SIZE(vq, sve->flags)) {
-		ksft_print_msg("Mismatch in SVE header size: %d != %lu\n",
-			       sve->size, SVE_PT_SIZE(vq, sve->flags));
-		pass = false;
+	if (svcr_in & SVCR_SM) {
+		if (sve->size != sizeof(sve)) {
+			ksft_print_msg("NT_ARM_SVE reports data with PSTATE.SM\n");
+			pass = false;
+		}
+	} else {
+		if (sve->size != SVE_PT_SIZE(vq, sve->flags)) {
+			ksft_print_msg("Mismatch in SVE header size: %d != %lu\n",
+				       sve->size, SVE_PT_SIZE(vq, sve->flags));
+			pass = false;
+		}
 	}
 
 	/* The registers might be in completely different formats! */
@@ -515,10 +522,17 @@ static bool check_ptrace_values_ssve(pid_t child, struct test_config *config)
 		pass = false;
 	}
 
-	if (sve->size != SVE_PT_SIZE(vq, sve->flags)) {
-		ksft_print_msg("Mismatch in SSVE header size: %d != %lu\n",
-			       sve->size, SVE_PT_SIZE(vq, sve->flags));
-		pass = false;
+	if (!(svcr_in & SVCR_SM)) {
+		if (sve->size != sizeof(sve)) {
+			ksft_print_msg("NT_ARM_SSVE reports data without PSTATE.SM\n");
+			pass = false;
+		}
+	} else {
+		if (sve->size != SVE_PT_SIZE(vq, sve->flags)) {
+			ksft_print_msg("Mismatch in SSVE header size: %d != %lu\n",
+				       sve->size, SVE_PT_SIZE(vq, sve->flags));
+			pass = false;
+		}
 	}
 
 	/* The registers might be in completely different formats! */
-- 
2.30.2