linux-kernel - [PATCH v7 5/9] kselftest/arm64/mte: check MTE

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Message-Id: <20250611135818.31070-6-yeoreum.yun@arm.com>
Date: Wed, 11 Jun 2025 14:58:14 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
	pcc@...gle.com,
	will@...nel.org,
	broonie@...nel.org,
	anshuman.khandual@....com,
	joey.gouly@....com,
	yury.khrustalev@....com,
	maz@...nel.org,
	oliver.upton@...ux.dev,
	frederic@...nel.org,
	akpm@...ux-foundation.org,
	surenb@...gle.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v7 5/9] kselftest/arm64/mte: check MTE_FAR feature is supported

To run the MTE_FAR test when cpu supports MTE_FAR feature,
check the MTE_FAR feature is supported in mte test.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 tools/testing/selftests/arm64/mte/mte_common_util.c | 4 ++++
 tools/testing/selftests/arm64/mte/mte_common_util.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.c b/tools/testing/selftests/arm64/mte/mte_common_util.c
index 83240b980f9c..5c5680a87498 100644
--- a/tools/testing/selftests/arm64/mte/mte_common_util.c
+++ b/tools/testing/selftests/arm64/mte/mte_common_util.c
@@ -26,6 +26,7 @@
 #define INIT_BUFFER_SIZE       256
 
 struct mte_fault_cxt cur_mte_cxt;
+bool mtefar_support;
 static unsigned int mte_cur_mode;
 static unsigned int mte_cur_pstate_tco;
 
@@ -325,12 +326,15 @@ int mte_switch_mode(int mte_option, unsigned long incl_mask)
 int mte_default_setup(void)
 {
 	unsigned long hwcaps2 = getauxval(AT_HWCAP2);
+	unsigned long hwcaps3 = getauxval(AT_HWCAP3);
 	unsigned long en = 0;
 	int ret;
 
 	if (!(hwcaps2 & HWCAP2_MTE))
 		ksft_exit_skip("MTE features unavailable\n");
 
+	mtefar_support = !!(hwcaps3 & HWCAP3_MTE_FAR);
+
 	/* Get current mte mode */
 	ret = prctl(PR_GET_TAGGED_ADDR_CTRL, en, 0, 0, 0);
 	if (ret < 0) {
diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.h b/tools/testing/selftests/arm64/mte/mte_common_util.h
index 6b109e84fa39..4e1dd959df9b 100644
--- a/tools/testing/selftests/arm64/mte/mte_common_util.h
+++ b/tools/testing/selftests/arm64/mte/mte_common_util.h
@@ -37,6 +37,7 @@ struct mte_fault_cxt {
 };
 
 extern struct mte_fault_cxt cur_mte_cxt;
+extern bool mtefar_support;
 
 /* MTE utility functions */
 void mte_default_handler(int signum, siginfo_t *si, void *uc);
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}