[RFC patch 9/9] selftests/resctrl: Add support for HiSilicon CAT/CMT test

[Yifan Wu]

This commit adds support for HiSilicon CAT/CMT test by adapting the
HiSilicon-specificed implementation.

1. Handle Cache Masking on HiSilicon: On HiSilicon's platform, all
cache are shareable, platform-level non-contiguous CAT is not applicable,
and the test should default to using the full cache.

2. Extend Non-Contiguous CAT Support: HiSilicon always support
non-contiguous CBM.

3. Specify Mount Options for HiSilicon resctrlfs: When mounting the
resctrl filesystem on HiSilicon platform, specify "l2" option.

4. Adjust Perf Event Attributes for ARM: ARM performance counters
do not support mode exclusion.

Signed-off-by: Yifan Wu <wuyifan50@xxxxxxxxxx>
---
 tools/testing/selftests/resctrl/cache.c     |  4 +++-
 tools/testing/selftests/resctrl/cat_test.c  | 18 +++++++++++-------
 tools/testing/selftests/resctrl/resctrlfs.c |  5 ++++-
 3 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 1ff1104e6575..798aefc6cb29 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -13,7 +13,9 @@ void perf_event_attr_initialize(struct perf_event_attr *pea, __u64 config)
 	pea->read_format = PERF_FORMAT_GROUP;
 	pea->exclude_kernel = 1;
 	pea->exclude_hv = 1;
-	pea->exclude_idle = 1;
+	/* ARM performance counters do not support mode exclusion */
+	if (get_vendor() != ARCH_HISILICON)
+		pea->exclude_idle = 1;
 	pea->exclude_callchain_kernel = 1;
 	pea->inherit = 1;
 	pea->exclude_guest = 1;
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index f00b622c1460..e5365665a6d3 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -245,11 +245,15 @@ static int cat_run_test(const struct resctrl_test *test, const struct user_param
 	ret = get_full_cbm(test->resource, &full_cache_mask);
 	if (ret)
 		return ret;
-	/* Get the largest contiguous exclusive portion of the cache */
-	ret = get_mask_no_shareable(test->resource, &long_mask);
-	if (ret)
-		return ret;
-
+	if (get_vendor() == ARCH_HISILICON) {
+		/* On HiSilicon's platform, all cache are shareable. */
+		long_mask = full_cache_mask;
+	} else {
+		/* Get the largest contiguous exclusive portion of the cache */
+		ret = get_mask_no_shareable(test->resource, &long_mask);
+		if (ret)
+			return ret;
+	}
 	/* Get L3/L2 cache size */
 	ret = get_cache_size(uparams->cpu, test->resource, &cache_total_size);
 	if (ret)
@@ -292,8 +296,8 @@ static bool arch_supports_noncont_cat(const struct resctrl_test *test)
 {
 	unsigned int vendor_id = get_vendor();
 
-	/* AMD and Hygon always support non-contiguous CBM. */
-	if (vendor_id == ARCH_AMD || vendor_id == ARCH_HYGON)
+	/* AMD and Hygon and HiSilicon always support non-contiguous CBM. */
+	if (vendor_id == ARCH_AMD || vendor_id == ARCH_HYGON || vendor_id == ARCH_HISILICON)
 		return true;
 
 #if defined(__i386__) || defined(__x86_64__) /* arch */
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 01b775cfe849..7567d3b31efb 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -69,7 +69,10 @@ int mount_resctrlfs(void)
 		return -1;
 
 	ksft_print_msg("Mounting resctrl to \"%s\"\n", RESCTRL_PATH);
-	ret = mount("resctrl", RESCTRL_PATH, "resctrl", 0, NULL);
+	if (get_vendor() == ARCH_HISILICON)
+		ret = mount("resctrl", RESCTRL_PATH, "resctrl", 0, "l2");
+	else
+		ret = mount("resctrl", RESCTRL_PATH, "resctrl", 0, NULL);
 	if (ret)
 		ksft_perror("mount");
 
-- 
2.33.0