drm/xe: Get hwe domain specific FW to read RING_TIMESTAMP

Per client engine utilization uses RING_TIMESTAMP to return
drm-total-cycles to the user. Current code uses XE_FW_GT to read this
register on the first available engine in a GT. When testing on DG2, it
is observed that this value is 0 when running test on some engines. To
resolve that, get the hwe domain specific FW for reading the engine
timestamp.

v2:
- update commit message
- use domain specific FW (Matt)

v3:
- Drop check for hwe in the helper (Matt, Michal)

v4:
- checkpatch fixes

v5: Rebase

Fixes: 188ced1e ("drm/xe/client: Print runtime to fdinfo")
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240627235105.2631135-1-umesh.nerlige.ramappa@intel.com

drivers/gpu/drm/xe/xe_drm_client.c

@@ -260,17 +260,20 @@ static void show_run_ticks(struct drm_printer *p, struct drm_file *file)
 
 	/* Get the total GPU cycles */
 	for_each_gt(gt, xe, gt_id) {
+		enum xe_force_wake_domains fw;
+
 		hwe = xe_gt_any_hw_engine(gt);
 		if (!hwe)
 			continue;
 
-		if (xe_force_wake_get(gt_to_fw(gt), XE_FW_GT)) {
+		fw = xe_hw_engine_to_fw_domain(hwe);
+		if (xe_force_wake_get(gt_to_fw(gt), fw)) {
 			hwe = NULL;
 			break;
 		}
 
 		gpu_timestamp = xe_hw_engine_read_timestamp(hwe);
-		XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FW_GT));
+		XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), fw));
 		break;
 	}
 

drivers/gpu/drm/xe/xe_hw_engine.c

@@ -1130,3 +1130,8 @@ u64 xe_hw_engine_read_timestamp(struct xe_hw_engine *hwe)
 {
 	return xe_mmio_read64_2x32(hwe->gt, RING_TIMESTAMP(hwe->mmio_base));
 }
+
+enum xe_force_wake_domains xe_hw_engine_to_fw_domain(struct xe_hw_engine *hwe)
+{
+	return engine_infos[hwe->engine_id].domain;
+}

drivers/gpu/drm/xe/xe_hw_engine.h

@@ -69,5 +69,6 @@ static inline bool xe_hw_engine_is_valid(struct xe_hw_engine *hwe)
 
 const char *xe_hw_engine_class_to_str(enum xe_engine_class class);
 u64 xe_hw_engine_read_timestamp(struct xe_hw_engine *hwe);
+enum xe_force_wake_domains xe_hw_engine_to_fw_domain(struct xe_hw_engine *hwe);
 
 #endif