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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 Reviewed-by: Ilpo J=C3=A4rvinen Signed-off-by: Richard Cheng --- 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 371a2f26dc47..692860c7ce59 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -357,11 +357,32 @@ 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. 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charset="utf-8" cl_flush() and sb() compile to empty functions on aarch64, making mem_flush() a silent no-op and leaving CMT/CAT tests operating on unflushed state. Add "dsb sy" for sb(), ARM requires a DSB whose access type covers both loads and stores. For cl_flush(), "dc civac" only reaches the Point of Coherency, on ARM MPAM systems the SLC lies past the PoC and may be a NOP on coherent platforms. Instead, dirty each cacheline with a store so that mem_flush's full-buffer sweep evicts lines from the SLC via LRU pressure. Signed-off-by: Richard Cheng --- Changes since v3: - cl_flush(): replace "dc civac" with a dirty store. dc civac only cleans to the Point of Coherency, so it does not reach the SLC where MPAM cache portions are enforced. Rely on LRU eviction from mem_flush()'s full-buffer sweep instead. tools/testing/selftests/resctrl/fill_buf.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/sel= ftests/resctrl/fill_buf.c index b9fa7968cd6e..eae0262fe265 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 +38,14 @@ static void cl_flush(void *p) #if defined(__i386) || defined(__x86_64) asm volatile("clflush (%0)\n\t" : : "r"(p) : "memory"); +#elif defined(__aarch64__) + /* + * Dirty the cache line with a store. 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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. Reviewed-by: Ilpo J=C3=A4rvinen Reviewed-by: Reinette Chatre Signed-off-by: Richard Cheng --- 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 692860c7ce59..55aca0af02c4 100644 --- a/tools/testing/selftests/resctrl/cat_test.c +++ b/tools/testing/selftests/resctrl/cat_test.c @@ -271,8 +271,13 @@ 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 ad1c17c0b0bf..5c752fc5d470 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 593f0ca5251b..57f9f9c0992b 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -24,6 +24,15 @@ 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; @@ -35,6 +44,18 @@ 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