platform/x86/intel/pmt: telemetry: Fix fixed region handling

Use the telem_type and the fixed block guid to determine if an entry is a
fixed region. For certain platforms we don't support this.

Cc: Srinivas Pandruvada <srinivas.pandruvada@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@linux.intel.com>
Link: https://lore.kernel.org/r/20220629221334.434307-4-gayatri.kammela@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Author: debox1

drivers/platform/x86/intel/pmt/telemetry.c

@@ -23,12 +23,19 @@
 #define TELEM_GUID_OFFSET	0x4
 #define TELEM_BASE_OFFSET	0x8
 #define TELEM_ACCESS(v)		((v) & GENMASK(3, 0))
+#define TELEM_TYPE(v)		(((v) & GENMASK(7, 4)) >> 4)
 /* size is in bytes */
 #define TELEM_SIZE(v)		(((v) & GENMASK(27, 12)) >> 10)
 
 /* Used by client hardware to identify a fixed telemetry entry*/
 #define TELEM_CLIENT_FIXED_BLOCK_GUID	0x10000000
 
+enum telem_type {
+	TELEM_TYPE_PUNIT = 0,
+	TELEM_TYPE_CRASHLOG,
+	TELEM_TYPE_PUNIT_FIXED,
+};
+
 struct pmt_telem_priv {
 	int				num_entries;
 	struct intel_pmt_entry		entry[];
@@ -39,10 +46,15 @@ static bool pmt_telem_region_overlaps(struct intel_pmt_entry *entry,
 {
 	u32 guid = readl(entry->disc_table + TELEM_GUID_OFFSET);
 
-	if (guid != TELEM_CLIENT_FIXED_BLOCK_GUID)
-		return false;
+	if (intel_pmt_is_early_client_hw(dev)) {
+		u32 type = TELEM_TYPE(readl(entry->disc_table));
+
+		if ((type == TELEM_TYPE_PUNIT_FIXED) ||
+		    (guid == TELEM_CLIENT_FIXED_BLOCK_GUID))
+			return true;
+	}
 
-	return intel_pmt_is_early_client_hw(dev);
+	return false;
 }
 
 static int pmt_telem_header_decode(struct intel_pmt_entry *entry,