linux-kernel - [PATCH v3 2/4] selftests/resctrl: Pass sysfs controller name of the vendor

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Date: Wed, 5 Jun 2024 17:45:32 -0500
From: Babu Moger <babu.moger@....com>
To: <fenghua.yu@...el.com>, <reinette.chatre@...el.com>, <shuah@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<ilpo.jarvinen@...ux.intel.com>, <babu.moger@....com>,
	<maciej.wieczor-retman@...el.com>, <peternewman@...gle.com>,
	<eranian@...gle.com>
Subject: [PATCH v3 2/4] selftests/resctrl: Pass sysfs controller name of the vendor

The test detects number of memory controllers by looking at the sysfs
file system. Detect the vendor to pass the controller name appropriately.
So, that rest of the code will be generic and can be used to support other
vendors.

Also change the search to look for the full string "uncore_imc_". Replace
the sizeof with strlen.

Signed-off-by: Babu Moger <babu.moger@....com>
---
v3: Change the search string to "uncore_imc_".

v2: No changes
---
 tools/testing/selftests/resctrl/resctrl_val.c | 22 ++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 2d5e961b3a68..23c0e0a1d845 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -10,7 +10,7 @@
  */
 #include "resctrl.h"
 
-#define UNCORE_IMC		"uncore_imc"
+#define UNCORE_IMC		"uncore_imc_"
 #define READ_FILE_NAME		"events/cas_count_read"
 #define WRITE_FILE_NAME		"events/cas_count_write"
 #define DYN_PMU_PATH		"/sys/bus/event_source/devices"
@@ -206,24 +206,30 @@ static int num_of_mem_controllers(void)
 	char mc_dir[512], *temp;
 	unsigned int count = 0;
 	struct dirent *ep;
-	int ret;
+	char *sysfs_name;
+	int ret, vendor;
 	DIR *dp;
 
+	vendor = get_vendor();
+	if (vendor == ARCH_INTEL) {
+		sysfs_name = UNCORE_IMC;
+	} else {
+		ksft_perror("Unsupported vendor!\n");
+		return -1;
+	}
+
 	dp = opendir(DYN_PMU_PATH);
 	if (dp) {
 		while ((ep = readdir(dp))) {
-			temp = strstr(ep->d_name, UNCORE_IMC);
+			temp = strstr(ep->d_name, sysfs_name);
 			if (!temp)
 				continue;
 
 			/*
 			 * imc counters are named as "uncore_imc_<n>", hence
-			 * increment the pointer to point to <n>. Note that
-			 * sizeof(UNCORE_IMC) would count for null character as
-			 * well and hence the last underscore character in
-			 * uncore_imc'_' need not be counted.
+			 * increment the pointer to point to <n>.
 			 */
-			temp = temp + sizeof(UNCORE_IMC);
+			temp = temp + strlen(sysfs_name);
 
 			/*
 			 * Some directories under "DYN_PMU_PATH" could have
-- 
2.34.1