powerpc-utils/lparstat-print-memory-mode-correctly.patch

From 4443a68d523043d69195e5a5a27fb9fc7ae8c50f Mon Sep 17 00:00:00 2001
From: Shrikanth Hegde <sshegde@linux.ibm.com>
Date: Mon, 10 Mar 2025 22:29:16 +0530
Subject: [PATCH] lparstat: print memory mode correctly (revised)

Patch-mainline: expected 1.3.14
Git-commit: 4443a68d523043d69195e5a5a27fb9fc7ae8c50f

Starting from power10, active memory sharing(AMS) is not supported.
So from power10 onwards the H_GET_MPP hcall fails and hence
corresponding fields in lparcfg are not populated, such as
entitled_memory_pool_number etc.

Use HWCAP mechanism and print memory model as dedicated for power10
onwards.

Suggested-by: Peter Bergner <bergner@linux.ibm.com>
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
---
 src/lparstat.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/lparstat.c b/src/lparstat.c
index db22316..8eddd7c 100644
--- a/src/lparstat.c
+++ b/src/lparstat.c
@@ -37,6 +37,11 @@
 #include "pseries_platform.h"
 #include "cpu_info_helpers.h"
 #include <time.h>
+#include <sys/auxv.h>
+
+#ifndef PPC_FEATURE2_ARCH_3_1
+#define PPC_FEATURE2_ARCH_3_1 0x00040000
+#endif
 
 #define LPARCFG_FILE	"/proc/ppc64/lparcfg"
 #define SE_NOT_FOUND	"???"
@@ -794,7 +799,11 @@ void get_memory_mode(struct sysentry *se, char *buf)
 	struct sysentry *tmp;
 
 	tmp = get_sysentry("entitled_memory_pool_number");
-	if (atoi(tmp->value) == 65535)
+	/*
+	 * from power10 onwards Active Memory Sharing(AMS) is not
+	 * supported. Hence always display it as dedicated for those
+	 */
+	if (atoi(tmp->value) == 65535 || (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_3_1))
 		sprintf(buf, "Dedicated");
 	else
 		sprintf(buf, "Shared");
-- 
2.47.1