linux-kernel - [RFC PATCH 5/5] kselftests/resctrl: Add support for CAT test on ARM

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Message-ID: <20260123044034.141247-6-tan.shaopeng@fujitsu.com>
Date: Fri, 23 Jan 2026 13:40:31 +0900
From: Shaopeng Tan <tan.shaopeng@...itsu.com>
To: fenghuay@...dia.com,
	reinette.chatre@...el.com,
	ben.horgan@....com,
	james.morse@....com,
	shuah@...nel.org
Cc: linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	tan.shaopeng@...itsu.com
Subject: [RFC PATCH 5/5] kselftests/resctrl: Add support for CAT test on ARM

Currently, CAT test is limited to Intel architectures.
Add cache cleaning and enable result checking for Arm architectures.

Signed-off-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
---
 tools/testing/selftests/resctrl/cat_test.c | 2 +-
 tools/testing/selftests/resctrl/fill_buf.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index e1b30ab4cef5..58b1590695d1 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -113,7 +113,7 @@ static int check_results(struct resctrl_val_param *param, const char *cache_type
 		ret = show_results_info(sum_llc_perf_miss, bits,
 					alloc_size / 64,
 					MIN_DIFF_PERCENT_PER_BIT * (bits - 1),
-					runs, get_vendor() == ARCH_INTEL,
+					runs, (get_vendor() == ARCH_INTEL || get_vendor() == ARCH_ARM),
 					&prev_avg_llc_val);
 		if (ret)
 			fail = 1;
diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
index 19a01a52dc1a..dbbf80d22f42 100644
--- a/tools/testing/selftests/resctrl/fill_buf.c
+++ b/tools/testing/selftests/resctrl/fill_buf.c
@@ -35,6 +35,10 @@ 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
 }
 
-- 
2.47.3