platform/x86/intel-uncore-freq: Ignore minor version change

The hardware definition of every TPMI feature contains a major and minor
version. When there is a change in the MMIO offset or change in the
definition of a field, hardware will change major version. For addition
of new fields without modifying existing MMIO offsets or fields, only the
minor version is changed.

Driver is developed to support uncore frequency control (UFS) for a major
and minor version. If the hardware changes major version, since offsets
and definitions are changed, driver cannot continue to provide UFS
interface to users. Driver can still function with minor version change
as it will just miss the new functionality added by the hardware.

The current implementation logs information message and skips adding
uncore sysfs entry for a resource for any version mismatch. Check major
and minor version mismatch for every valid resource and fail on any major
version mismatch by logging an error message. A valid resource has a
version which is not 0xFF.

If there is mismatch with the minor version, continue with a log message.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20231003184916.1860084-4-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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 7d0a67f8b517a785284226889b3b63bdea1ba086..4fb790552c47eb403eba86e498845c4c6a9b712f 100644 (file)
--- 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 +303,21 @@ 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_err(&auxdev->dev, "Uncore: Unsupported major version:%lx\n",
+                               TPMI_MAJOR_VERSION(pd_info->ufs_header_ver));
+                       ret = -ENODEV;
+                       goto remove_clusters;
                }
 
+               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) {