[Intel-xe] [PATCH 3/8] RFC drm/xe/guc: Expose engine busyness only for supported GuC version

[Riana Tauro]

Engine busyness is supported only on GuC versions >= 70.11.1.
Allow enabling/reading engine busyness only on supported
GuC versions. Warn once if not supported.

Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Signed-off-by: Riana Tauro <riana.tauro at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_engine_busyness.c | 29 +++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_engine_busyness.c b/drivers/gpu/drm/xe/xe_guc_engine_busyness.c
index 92b37e55fa08..611bafd14d1a 100644
--- a/drivers/gpu/drm/xe/xe_guc_engine_busyness.c
+++ b/drivers/gpu/drm/xe/xe_guc_engine_busyness.c
@@ -22,6 +22,23 @@
  * engine busyness ticks (ticks_engine) : clock ticks for which engine was active
  */
 
+static bool guc_engine_busyness_supported(struct xe_guc *guc)
+{
+	struct xe_uc_fw *uc_fw = &guc->fw;
+
+	/* Must not call this before the submit version is determined! */
+	XE_WARN_ON(guc->submission_state.version.major == 0);
+
+	if (uc_fw->major_ver_found >= 70 && uc_fw->minor_ver_found >= 11 &&
+	    uc_fw->patch_ver_found >= 1)
+		return true;
+
+	drm_WARN_ON_ONCE(&guc_to_xe(guc)->drm,
+			 "Engine busyness not supported in this GuC version\n");
+
+	return false;
+}
+
 static void guc_engine_busyness_usage_map(struct xe_guc *guc,
 					  struct xe_hw_engine *hwe,
 					  struct iosys_map *engine_map)
@@ -79,6 +96,10 @@ static void guc_engine_busyness_enable_stats(struct xe_guc *guc)
 	struct xe_device *xe = guc_to_xe(guc);
 	int ret;
 
+	/* Engine busyness supported only on GuC >= 70.11.1 */
+	if (!guc_engine_busyness_supported(guc))
+		return;
+
 	ret = xe_guc_ct_send(&guc->ct, action, ARRAY_SIZE(action), 0, 0);
 	if (ret)
 		drm_err(&xe->drm, "Failed to enable usage stats %pe", ERR_PTR(ret));
@@ -103,6 +124,10 @@ u64 xe_guc_engine_busyness_ticks(struct xe_guc *guc, struct xe_hw_engine *hwe)
 {
 	u64 ticks_engine;
 
+	/* Engine busyness supported only on GuC >= 70.11.1 */
+	if (!guc_engine_busyness_supported(guc))
+		return 0;
+
 	guc_engine_busyness_get_usage(guc, hwe, &ticks_engine);
 
 	return ticks_engine;
@@ -126,6 +151,10 @@ int xe_guc_engine_busyness_init(struct xe_guc *guc)
 	u32 size;
 	int err;
 
+	/* Engine busyness supported only on GuC >= 70.11.1 */
+	if (!guc_engine_busyness_supported(guc))
+		return 0;
+
 	/* Initialization already done */
 	if (guc->busy.bo)
 		return 0;
-- 
2.40.0