[PATCH RESEND v7 2/2] perf pmu intel: Adjust cpumasks for sub-NUMA clusters on Sapphire Rapids and Emerald Rapids

[Chun-Tse Shao <ctshao@google.com>]

Similar to GNR [1], Sapphire Rapids and Emerald Rapids support sub-NUMA
clusters as well. Adjust cpumasks using the same logic as GNR in [1].

Tested on Emerald Rapids with SNC2 enabled:
  $ perf stat --per-node -e 'UNC_CHA_CLOCKTICKS,UNC_M_CLOCKTICKS' -a -- sleep 1

   Performance counter stats for 'system wide':

  N0       30        72125876670      UNC_CHA_CLOCKTICKS
  N0        4         8815163648      UNC_M_CLOCKTICKS
  N1       30        72124958844      UNC_CHA_CLOCKTICKS
  N1        4         8815014974      UNC_M_CLOCKTICKS
  N2       30        72121049022      UNC_CHA_CLOCKTICKS
  N2        4         8814592626      UNC_M_CLOCKTICKS
  N3       30        72117133854      UNC_CHA_CLOCKTICKS
  N3        4         8814012840      UNC_M_CLOCKTICKS

         1.001574118 seconds time elapsed

[1] lore.kernel.org/20250515181417.491401-1-irogers@google.com

Reviewed-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Chun-Tse Shao <ctshao@google.com>
Assisted-by: Gemini:gemini-3.1-pro-preview
---
 tools/perf/arch/x86/util/pmu.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
index 9b00d5720fb7..2c24ef3140da 100644
--- a/tools/perf/arch/x86/util/pmu.c
+++ b/tools/perf/arch/x86/util/pmu.c
@@ -23,6 +23,8 @@
 #include "util/env.h"
 #include "util/header.h"

+#define GENUINE_INTEL_SPR "GenuineIntel-6-8F"
+#define GENUINE_INTEL_EMR "GenuineIntel-6-CF"
 #define GENUINE_INTEL_GNR "GenuineIntel-6-A[DE]"

 static bool cached_snc_supported;
@@ -30,8 +32,10 @@ static pthread_once_t snc_support_once = PTHREAD_ONCE_INIT;

 static void init_snc_support(void)
 {
-	/* Graniterapids supports SNC configuration. */
+	/* Sapphirerapids Emeraldrapids Graniterapids support SNC configuration. */
 	static const char *const supported_cpuids[] = {
+		GENUINE_INTEL_SPR, /* Sapphirerapids */
+		GENUINE_INTEL_EMR, /* Emeraldrapids */
 		GENUINE_INTEL_GNR, /* Graniterapids */
 	};
 	char *cpuid = get_cpuid_str((struct perf_cpu){0});
@@ -161,6 +165,7 @@ static void init_snc_map(void)
 {
 	int snc_nodes = snc_nodes_per_l3_cache();
 	char *cpuid;
+	static const u8 spr_emr_snc2_map[] = { 0, 0, 1, 1 };
 	static const u8 gnr_snc2_map[] = { 1, 1, 0, 0 };
 	static const u8 snc3_map[] = { 1, 1, 0, 0, 2, 2 };

@@ -168,7 +173,11 @@ static void init_snc_map(void)
 	case 2:
 		cpuid = get_cpuid_str((struct perf_cpu){ 0 });
 		if (cpuid) {
-			if (strcmp_cpuid_str(GENUINE_INTEL_GNR, cpuid) == 0) {
+			if (strcmp_cpuid_str(GENUINE_INTEL_SPR, cpuid) == 0 ||
+			    strcmp_cpuid_str(GENUINE_INTEL_EMR, cpuid) == 0) {
+				cached_imc_snc_map = spr_emr_snc2_map;
+				cached_imc_snc_map_len = ARRAY_SIZE(spr_emr_snc2_map);
+			} else if (strcmp_cpuid_str(GENUINE_INTEL_GNR, cpuid) == 0) {
 				cached_imc_snc_map = gnr_snc2_map;
 				cached_imc_snc_map_len = ARRAY_SIZE(gnr_snc2_map);
 			}
--
2.54.0.823.g6e5bcc1fc9-goog