drm/xe/guc: Capture all available bits of GuC timestamp

The extra bits are not hugely useful because the GuC log only uses
32bit time stamps. But they exist so might as well provide them.

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241024002554.1983101-2-John.C.Harrison@Intel.com

drivers/gpu/drm/xe/regs/xe_guc_regs.h

@@ -84,7 +84,8 @@
 #define   HUC_LOADING_AGENT_GUC			REG_BIT(1)
 #define   GUC_WOPCM_OFFSET_VALID		REG_BIT(0)
 #define GUC_MAX_IDLE_COUNT			XE_REG(0xc3e4)
-#define GUC_PMTIMESTAMP				XE_REG(0xc3e8)
+#define GUC_PMTIMESTAMP_LO			XE_REG(0xc3e8)
+#define GUC_PMTIMESTAMP_HI			XE_REG(0xc3ec)
 
 #define GUC_SEND_INTERRUPT			XE_REG(0xc4c8)
 #define   GUC_SEND_TRIGGER			REG_BIT(0)

drivers/gpu/drm/xe/xe_guc_log.c

@@ -171,9 +171,9 @@ struct xe_guc_log_snapshot *xe_guc_log_snapshot_capture(struct xe_guc_log *log,
 
 	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
 	if (!fw_ref) {
-		snapshot->stamp = ~0;
+		snapshot->stamp = ~0ULL;
 	} else {
-		snapshot->stamp = xe_mmio_read32(&gt->mmio, GUC_PMTIMESTAMP);
+		snapshot->stamp = xe_mmio_read64_2x32(&gt->mmio, GUC_PMTIMESTAMP_LO);
 		xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	}
 	snapshot->ktime = ktime_get_boottime_ns();
@@ -205,7 +205,7 @@ void xe_guc_log_snapshot_print(struct xe_guc_log_snapshot *snapshot, struct drm_
 		   snapshot->ver_found.major, snapshot->ver_found.minor, snapshot->ver_found.patch,
 		   snapshot->ver_want.major, snapshot->ver_want.minor, snapshot->ver_want.patch);
 	drm_printf(p, "Kernel timestamp: 0x%08llX [%llu]\n", snapshot->ktime, snapshot->ktime);
-	drm_printf(p, "GuC timestamp: 0x%08X [%u]\n", snapshot->stamp, snapshot->stamp);
+	drm_printf(p, "GuC timestamp: 0x%08llX [%llu]\n", snapshot->stamp, snapshot->stamp);
 	drm_printf(p, "Log level: %u\n", snapshot->level);
 
 	remain = snapshot->size;

drivers/gpu/drm/xe/xe_guc_log_types.h

@@ -27,7 +27,7 @@ struct xe_guc_log_snapshot {
 	/** @ktime: Kernel time the snapshot was taken */
 	u64 ktime;
 	/** @stamp: GuC timestamp at which the snapshot was taken */
-	u32 stamp;
+	u64 stamp;
 	/** @level: GuC log verbosity level */
 	u32 level;
 	/** @ver_found: GuC firmware version */