linux-kernel - [PATCH 3/3] platform/x86/intel-uncore-freq: Check major minor version

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Date:   Mon, 25 Sep 2023 12:43:38 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     hdegoede@...hat.com, markgross@...nel.org,
        ilpo.jarvinen@...ux.intel.com, andriy.shevchenko@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH 3/3] platform/x86/intel-uncore-freq: Check major minor version

Parse major and minor version number from the version field. If there
is a mismatch for major version, exit from further processing for that
domain.

If there is mismatch in minor version, driver continue to process with
an error message. Minor version change doesn't change offsets and bit
structures of TPMI fields.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../uncore-frequency/uncore-frequency-tpmi.c    | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
index 7d0a67f8b517..4d63ee6bc6d2 100644
--- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
+++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
@@ -28,7 +28,8 @@
 
 #include "uncore-frequency-common.h"
 
-#define	UNCORE_HEADER_VERSION		1
+#define	UNCORE_MAJOR_VERSION		0
+#define	UNCORE_MINOR_VERSION		1
 #define UNCORE_HEADER_INDEX		0
 #define UNCORE_FABRIC_CLUSTER_OFFSET	8
 
@@ -302,12 +303,20 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
 		/* Check for version and skip this resource if there is mismatch */
 		header = readq(pd_info->uncore_base);
 		pd_info->ufs_header_ver = header & UNCORE_VERSION_MASK;
-		if (pd_info->ufs_header_ver != UNCORE_HEADER_VERSION) {
-			dev_info(&auxdev->dev, "Uncore: Unsupported version:%d\n",
-				pd_info->ufs_header_ver);
+
+		if (pd_info->ufs_header_ver == TPMI_VERSION_INVALID)
+			continue;
+
+		if (TPMI_MAJOR_VERSION(pd_info->ufs_header_ver) != UNCORE_MAJOR_VERSION) {
+			dev_info(&auxdev->dev, "Uncore: Unsupported major version:%lx\n",
+				 TPMI_MAJOR_VERSION(pd_info->ufs_header_ver));
 			continue;
 		}
 
+		if (TPMI_MINOR_VERSION(pd_info->ufs_header_ver) != UNCORE_MINOR_VERSION)
+			dev_info(&auxdev->dev, "Uncore: Ignore: Unsupported minor version:%lx\n",
+				 TPMI_MINOR_VERSION(pd_info->ufs_header_ver));
+
 		/* Get Cluster ID Mask */
 		cluster_mask = FIELD_GET(UNCORE_LOCAL_FABRIC_CLUSTER_ID_MASK, header);
 		if (!cluster_mask) {
-- 
2.41.0