[PATCH v2 19/30] drm/i915/guc: New GuC IDs based on engine class and instance

[Michal Wajdeczko]

From: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>

Starting from Gen11, the ID to be provided to GuC needs to contain
the engine class in bits [0..2] and the instance in bits [3..6].

NOTE: this patch breaks pointer dereferences in some existing GuC
functions that use the guc_id to dereference arrays but these functions
are not used for now as we have GuC submission disabled and we will
update these functions in follow up patch which requires new IDs.

Bspec: 20944

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
Signed-off-by: Michel Thierry <michel.thierry at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michal Winiarski <michal.winiarski at intel.com>
Cc: Tomasz Lis <tomasz.lis at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c |  3 ++-
 drivers/gpu/drm/i915/intel_guc_fwif.h  | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index f777afc33d8a..6e0efdd5d354 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -312,7 +312,8 @@ intel_engine_setup(struct drm_i915_private *dev_priv,
 	engine->i915 = dev_priv;
 	engine->uncore = &dev_priv->uncore;
 	__sprint_engine_name(engine->name, info);
-	engine->hw_id = engine->guc_id = info->hw_id;
+	engine->hw_id = info->hw_id;
+	engine->guc_id = MAKE_GUC_ID(info->class, info->instance);
 	engine->mmio_base = __engine_mmio_base(dev_priv, info->mmio_bases);
 	engine->class = info->class;
 	engine->instance = info->instance;
diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 115c693daf8e..61f718b907f3 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -117,6 +117,25 @@
 
 #define GUC_CTL_MAX_DWORDS		(SOFT_SCRATCH_COUNT - 2) /* [1..14] */
 
+/*
+ * The class goes in bits [0..2] of the GuC ID, the instance in bits [3..6].
+ * Bit 7 can be used for operations that apply to all engine classes&instances.
+ */
+#define GUC_ENGINE_CLASS_SHIFT		0
+#define GUC_ENGINE_CLASS_MASK		(0x7 << GUC_ENGINE_CLASS_SHIFT)
+#define GUC_ENGINE_INSTANCE_SHIFT	3
+#define GUC_ENGINE_INSTANCE_MASK	(0xf << GUC_ENGINE_INSTANCE_SHIFT)
+#define GUC_ENGINE_ALL_INSTANCES	(1 << 7)
+
+#define MAKE_GUC_ID(class, instance) \
+	(((class) << GUC_ENGINE_CLASS_SHIFT) | \
+	 ((instance) << GUC_ENGINE_INSTANCE_SHIFT))
+
+#define GUC_ID_TO_ENGINE_CLASS(guc_id) \
+	(((guc_id) & GUC_ENGINE_CLASS_MASK) >> GUC_ENGINE_CLASS_SHIFT)
+#define GUC_ID_TO_ENGINE_INSTANCE(guc_id) \
+	(((guc_id) & GUC_ENGINE_INSTANCE_MASK) >> GUC_ENGINE_INSTANCE_SHIFT)
+
 /**
  * DOC: GuC Firmware Layout
  *
-- 
2.19.2