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On MPAM, shareable_bits =3D=3D cbm_mask is a legitimate state, so there are situations in which no bit can be reported as exclusive. Previously get_mask_no_shareable() was invoked inside cat_run_test() and silently returned -1, which surfaced as a test failure on arm64 MPAM systems. Implement cat_feature_check() to perform the same check at feature-check time. It prints a diagnostic and returns false so the test case is skipped instead of failing. Tested-by: Chen Yu Signed-off-by: Richard Cheng Reviewed-by: Ilpo J=C3=A4rvinen --- tools/testing/selftests/resctrl/cat_test.c | 23 +++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/sel= ftests/resctrl/cat_test.c index f00b622c1460..dc414e55ae94 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -378,11 +378,32 @@ static bool noncont_cat_feature_check(const struct re= sctrl_test *test) return resource_info_file_exists(test->resource, "sparse_masks"); } =20 +static bool cat_feature_check(const struct resctrl_test *test) +{ + unsigned long mask; + + if (!test_resource_feature_check(test)) + return false; + + /* + * The CAT isolation measurement needs a cache portion that no + * other agent shares. On MPAM the kernel may legitimately report + * all bits as shareable; skip the test if that is the case. + */ + if (get_mask_no_shareable(test->resource, &mask)) { + ksft_print_msg("All %s bits are shareable; cannot measure CAT isolation\= n", + test->resource); + return false; + } + + return true; +} + struct resctrl_test l3_cat_test =3D { .name =3D "L3_CAT", .group =3D "CAT", .resource =3D "L3", - .feature_check =3D test_resource_feature_check, + .feature_check =3D cat_feature_check, .run_test =3D cat_run_test, .cleanup =3D cat_test_cleanup, }; --=20 2.43.0 From nobody Mon Jun 8 13:24:58 2026 Received: from DM5PR21CU001.outbound.protection.outlook.com (mail-centralusazon11011017.outbound.protection.outlook.com [52.101.62.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC87530567E; Fri, 29 May 2026 02:24:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.62.17 ARC-Seal: i=2; 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charset="utf-8" cl_flush() and sb() in fill_buf.c only have implementations for i386 and x86_64, so on aarch64 both compile to empty functions. mem_flush() then walks the buffer calling a no-op cl_flush() per cache line and finishes with a no-op sb(), leaving any caller that expects a flushed buffer (e.g. CMT, L3_CAT) operating on unflushed state with no warning. Add an aarch64 code block using the ARM equivalents: * "dc civac, %0" for cl_flush() * "dsb sy" for sb() Both instructions are EL0-accessible on Linux aarch64. Signed-off-by: Richard Cheng --- tools/testing/selftests/resctrl/fill_buf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/sel= ftests/resctrl/fill_buf.c index 19a01a52dc1a..a41d21e5a64e 100644 --- a/tools/testing/selftests/resctrl/fill_buf.c +++ b/tools/testing/selftests/resctrl/fill_buf.c @@ -27,6 +27,9 @@ static void sb(void) #if defined(__i386) || defined(__x86_64) asm volatile("sfence\n\t" : : : "memory"); +#elif defined(__aarch64__) + asm volatile("dsb sy\n\t" + : : : "memory"); #endif } =20 @@ -35,6 +38,9 @@ static void cl_flush(void *p) #if defined(__i386) || defined(__x86_64) asm volatile("clflush (%0)\n\t" : : "r"(p) : "memory"); +#elif defined(__aarch64__) + asm volatile("dc civac, %0\n\t" + : : "r"(p) : "memory"); #endif } =20 --=20 2.43.0 From nobody Mon Jun 8 13:24:58 2026 Received: from DM5PR21CU001.outbound.protection.outlook.com (mail-centralusazon11011003.outbound.protection.outlook.com [52.101.62.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A7963340402; 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charset="utf-8" aarch64 has no vendor_id in /proc/cpuinfo, so detect_vendor() returns 0 and arch_supports_noncont_cat() falls through to "return false". L3_NONCONT_CAT therefore spuriously fails on every ARM MPAM platform. Define ARCH_ARM, short-circuit detect_vendor() to it on aarch64, and add it to the AMD/Hygon always-supports early-out in arch_supports_noncont_cat(). aarch64 has many implementers (ARM 0x41, NVIDIA 0x43, etc.), but MPAM mandates non-contiguous CPBM uniformly, so per-implementer handling is not needed here. Signed-off-by: Richard Cheng Reviewed-by: Ilpo J=C3=A4rvinen --- tools/testing/selftests/resctrl/cat_test.c | 9 ++++++-- tools/testing/selftests/resctrl/resctrl.h | 1 + .../testing/selftests/resctrl/resctrl_tests.c | 21 +++++++++++++++++++ 3 files changed, 29 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/sel= ftests/resctrl/cat_test.c index dc414e55ae94..ce66016dbd88 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -292,8 +292,13 @@ static bool arch_supports_noncont_cat(const struct res= ctrl_test *test) { unsigned int vendor_id =3D get_vendor(); =20 - /* AMD and Hygon always support non-contiguous CBM. */ - if (vendor_id =3D=3D ARCH_AMD || vendor_id =3D=3D ARCH_HYGON) + /* + * AMD and Hygon always support non-contiguous CBM. ARM/MPAM defines + * MPAMCFG_CPBM as a bitmap with no contiguity constraint per ARM + * DDI 0598. + */ + if (vendor_id =3D=3D ARCH_AMD || vendor_id =3D=3D ARCH_HYGON || + vendor_id =3D=3D ARCH_ARM) return true; =20 #if defined(__i386__) || defined(__x86_64__) /* arch */ diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/self= tests/resctrl/resctrl.h index afe635b6e48d..670e5b128b4d 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -40,6 +40,7 @@ #define ARCH_INTEL BIT(0) #define ARCH_AMD BIT(1) #define ARCH_HYGON BIT(2) +#define ARCH_ARM BIT(3) =20 #define END_OF_TESTS 1 =20 diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testin= g/selftests/resctrl/resctrl_tests.c index dbcd5eea9fbc..cfece594a8c6 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -23,6 +23,15 @@ static struct resctrl_test *resctrl_tests[] =3D { &l2_noncont_cat_test, }; =20 +static bool detect_aarch64(void) +{ +#if defined(__aarch64__) + return true; +#else + return false; +#endif +} + static unsigned int detect_vendor(void) { static unsigned int vendor_id; @@ -34,6 +43,18 @@ static unsigned int detect_vendor(void) if (initialized) return vendor_id; =20 + if (detect_aarch64()) { + /* + * aarch64 has no userspace vendor_id in /proc/cpuinfo. + * MPAM-capable ARM implementations follow ARM DDI 0598; + * treat all aarch64 builds as a single vendor for the + * purposes of resctrl selftests. + */ + vendor_id =3D ARCH_ARM; + initialized =3D true; + return vendor_id; + } + inf =3D fopen("/proc/cpuinfo", "r"); if (!inf) { vendor_id =3D 0; --=20 2.43.0