[PATCH v3 2/4] drm/i915/gt: Do not exposed fused off engines.

[Andi Shyti]

Some of the CCS engines are disabled. They should not be listed
in the uabi_engine list, that is the list of engines that the
user can see.

Fixes: d2eae8e98d59 ("drm/i915/dg2: Drop force_probe requirement")
Requires: 4e4f77d74878 ("drm/i915/gt: Refactor uabi engine class/instance list creation")
Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_user.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
index cf8f24ad88f6..ec5bcd1c1ec4 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
@@ -244,6 +244,18 @@ void intel_engines_driver_register(struct drm_i915_private *i915)
 		if (uabi_class > I915_LAST_UABI_ENGINE_CLASS)
 			continue;
 
+		/*
+		 * If the CCS engine is fused off, the corresponding bit
+		 * in the engine mask is disabled. Do not expose it
+		 * to the user.
+		 *
+		 * By default at least one engine is enabled (check
+		 * the engine_mask_apply_compute_fuses() function.
+		 */
+		if (!(engine->gt->info.engine_mask &
+		      BIT(_CCS(engine->uabi_instance))))
+			continue;
+
 		GEM_BUG_ON(uabi_class >=
 			   ARRAY_SIZE(i915->engine_uabi_class_count));
 		i915->engine_uabi_class_count[uabi_class]++;
-- 
2.43.0