From: Andre Przywara <andre.przywara@arm.com>
To: Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Shuah Khan <shuah@kernel.org>
Cc: Amit Daniel Kachhap <amit.kachhap@arm.com>,
Mark Brown <broonie@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kselftest@vger.kernel.org
Subject: [PATCH 06/11] kselftest/arm64: mte: Fix MTE feature detection
Date: Fri, 19 Mar 2021 16:53:29 +0000 [thread overview]
Message-ID: <20210319165334.29213-7-andre.przywara@arm.com> (raw)
In-Reply-To: <20210319165334.29213-1-andre.przywara@arm.com>
To check whether the CPU and kernel support the MTE features we want
to test, we use an (emulated) CPU ID register read. However we only
check against a very particular feature version (0b0010), even though
the ARM ARM promises ID register features to be backwards compatible.
While this could be fixed by using ">=" instead of "==", we should
actually use the explicit HWCAP2_MTE hardware capability, exposed by the
kernel via the ELF auxiliary vectors.
That moves this responsibility to the kernel, and fixes running the
tests on machines with FEAT_MTE3 capability.
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
---
tools/testing/selftests/arm64/mte/mte_common_util.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.c b/tools/testing/selftests/arm64/mte/mte_common_util.c
index 4e887dad762d..aa8a8a6b8b6d 100644
--- a/tools/testing/selftests/arm64/mte/mte_common_util.c
+++ b/tools/testing/selftests/arm64/mte/mte_common_util.c
@@ -291,22 +291,13 @@ int mte_switch_mode(int mte_option, unsigned long incl_mask)
return 0;
}
-#define ID_AA64PFR1_MTE_SHIFT 8
-#define ID_AA64PFR1_MTE 2
-
int mte_default_setup(void)
{
- unsigned long hwcaps = getauxval(AT_HWCAP);
+ unsigned long hwcaps2 = getauxval(AT_HWCAP2);
unsigned long en = 0;
int ret;
- if (!(hwcaps & HWCAP_CPUID)) {
- ksft_print_msg("FAIL: CPUID registers unavailable\n");
- return KSFT_FAIL;
- }
- /* Read ID_AA64PFR1_EL1 register */
- asm volatile("mrs %0, id_aa64pfr1_el1" : "=r"(hwcaps) : : "memory");
- if (((hwcaps >> ID_AA64PFR1_MTE_SHIFT) & MT_TAG_MASK) != ID_AA64PFR1_MTE) {
+ if (!(hwcaps2 & HWCAP2_MTE)) {
ksft_print_msg("FAIL: MTE features unavailable\n");
return KSFT_SKIP;
}
--
2.17.5
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next prev parent reply other threads:[~2021-03-19 16:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-19 16:53 [PATCH 00/11] kselftest/arm64: mte: Fix feature detection and compilation Andre Przywara
2021-03-19 16:53 ` [PATCH 01/11] kselftest/arm64: mte: Fix compilation with native compiler Andre Przywara
2021-03-19 17:29 ` Nick Desaulniers
2021-03-19 16:53 ` [PATCH 02/11] kselftest/arm64: mte: Fix pthread linking Andre Przywara
2021-03-19 16:53 ` [PATCH 03/11] kselftest/arm64: mte: ksm_options: Fix fscanf warning Andre Przywara
2021-03-19 16:53 ` [PATCH 04/11] kselftest/arm64: mte: user_mem: Fix write() warning Andre Przywara
2021-03-19 16:53 ` [PATCH 05/11] kselftest/arm64: mte: common: Fix write() warnings Andre Przywara
2021-03-19 16:53 ` Andre Przywara [this message]
2021-03-19 16:53 ` [PATCH 07/11] kselftest/arm64: mte: Use cross-compiler if specified Andre Przywara
2021-03-19 16:53 ` [PATCH 08/11] kselftest/arm64: mte: Output warning about failing compiler Andre Przywara
2021-03-19 16:53 ` [PATCH 09/11] kselftest/arm64: mte: Makefile: Fix clang compilation Andre Przywara
2021-03-19 16:53 ` [PATCH 10/11] kselftest/arm64: mte: Fix clang warning Andre Przywara
2021-03-19 17:36 ` Nick Desaulniers
2021-03-19 16:53 ` [PATCH 11/11] kselftest/arm64: mte: Report filename on failing temp file creation Andre Przywara
2021-03-19 17:12 ` [PATCH 00/11] kselftest/arm64: mte: Fix feature detection and compilation Mark Brown
2021-03-23 17:54 ` Catalin Marinas
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