[PATCH v8 06/12] drm/xe: Engine class and instance into a u8

[Matthew Brost <matthew.brost@intel.com>]

Pack the engine class and instance fields into a single u8 to save space
in struct xe_pagefault. This also makes future extensions easier.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_pagefault.c   |  7 +++++--
 drivers/gpu/drm/xe/xe_pagefault.c       | 12 ++++++++----
 drivers/gpu/drm/xe/xe_pagefault_types.h | 10 ++++++----
 drivers/gpu/drm/xe/xe_vm.c              |  7 +++++--
 4 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_pagefault.c b/drivers/gpu/drm/xe/xe_guc_pagefault.c
index 607e32392f46..2470faf3d5d8 100644
--- a/drivers/gpu/drm/xe/xe_guc_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_guc_pagefault.c
@@ -89,8 +89,11 @@ int xe_guc_pagefault_handler(struct xe_guc *guc, u32 *msg, u32 len)
 				   FIELD_GET(PFD_FAULT_LEVEL, msg[0])) |
 			FIELD_PREP(XE_PAGEFAULT_TYPE_MASK,
 				   FIELD_GET(PFD_FAULT_TYPE, msg[2]));
-	pf.consumer.engine_class = FIELD_GET(PFD_ENG_CLASS, msg[0]);
-	pf.consumer.engine_instance = FIELD_GET(PFD_ENG_INSTANCE, msg[0]);
+	pf.consumer.engine_class_instance =
+		FIELD_PREP(XE_PAGEFAULT_ENGINE_CLASS_MASK,
+			   FIELD_GET(PFD_ENG_CLASS, msg[0])) |
+		FIELD_PREP(XE_PAGEFAULT_ENGINE_INSTANCE_MASK,
+			   FIELD_GET(PFD_ENG_INSTANCE, msg[0]));
 
 	pf.producer.private = guc;
 	pf.producer.ops = &guc_pagefault_ops;
diff --git a/drivers/gpu/drm/xe/xe_pagefault.c b/drivers/gpu/drm/xe/xe_pagefault.c
index 8198c60e960a..2b0fabe29e25 100644
--- a/drivers/gpu/drm/xe/xe_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_pagefault.c
@@ -239,13 +239,16 @@ static bool xe_pagefault_queue_pop(struct xe_pagefault_queue *pf_queue,
 
 static void xe_pagefault_print(struct xe_pagefault *pf)
 {
+	u8 engine_class = FIELD_GET(XE_PAGEFAULT_ENGINE_CLASS_MASK,
+				    pf->consumer.engine_class_instance);
+
 	xe_gt_info(pf->gt, "\n\tASID: %d\n"
 		   "\tFaulted Address: 0x%08x%08x\n"
 		   "\tFaultType: %lu\n"
 		   "\tAccessType: %lu\n"
 		   "\tFaultLevel: %lu\n"
 		   "\tEngineClass: %d %s\n"
-		   "\tEngineInstance: %d\n",
+		   "\tEngineInstance: %lu\n",
 		   pf->consumer.asid,
 		   upper_32_bits(pf->consumer.page_addr),
 		   lower_32_bits(pf->consumer.page_addr),
@@ -255,9 +258,10 @@ static void xe_pagefault_print(struct xe_pagefault *pf)
 			     pf->consumer.access_type),
 		   FIELD_GET(XE_PAGEFAULT_LEVEL_MASK,
 			     pf->consumer.fault_type_level),
-		   pf->consumer.engine_class,
-		   xe_hw_engine_class_to_str(pf->consumer.engine_class),
-		   pf->consumer.engine_instance);
+		   engine_class,
+		   xe_hw_engine_class_to_str(engine_class),
+		   FIELD_GET(XE_PAGEFAULT_ENGINE_INSTANCE_MASK,
+			     pf->consumer.engine_class_instance));
 }
 
 static void xe_pagefault_save_to_vm(struct xe_device *xe, struct xe_pagefault *pf)
diff --git a/drivers/gpu/drm/xe/xe_pagefault_types.h b/drivers/gpu/drm/xe/xe_pagefault_types.h
index 64ab4ea8807b..d349d79bc95e 100644
--- a/drivers/gpu/drm/xe/xe_pagefault_types.h
+++ b/drivers/gpu/drm/xe/xe_pagefault_types.h
@@ -82,10 +82,12 @@ struct xe_pagefault {
 #define XE_PAGEFAULT_TYPE_LEVEL_NACK		0xff	/* Producer indicates nack fault */
 #define XE_PAGEFAULT_LEVEL_MASK			GENMASK(3, 0)
 #define XE_PAGEFAULT_TYPE_MASK			GENMASK(7, 4)
-		/** @consumer.engine_class: engine class */
-		u8 engine_class;
-		/** @consumer.engine_instance: engine instance */
-		u8 engine_instance;
+		/** @consumer.engine_class_instance: engine class and instance */
+		u8 engine_class_instance;
+#define XE_PAGEFAULT_ENGINE_CLASS_MASK		GENMASK(3, 0)
+#define XE_PAGEFAULT_ENGINE_INSTANCE_MASK	GENMASK(7, 4)
+		/** @pad: alignment padding */
+		u8 pad;
 		/** @consumer.reserved: reserved bits for future expansion */
 		u64 reserved;
 	} consumer;
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index e136951ac11a..4901cd999367 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -615,10 +615,13 @@ void xe_vm_add_fault_entry_pf(struct xe_vm *vm, struct xe_pagefault *pf)
 {
 	struct xe_vm_fault_entry *e;
 	struct xe_hw_engine *hwe;
+	u8 engine_class = FIELD_GET(XE_PAGEFAULT_ENGINE_CLASS_MASK,
+				    pf->consumer.engine_class_instance);
+	u8 engine_instance = FIELD_GET(XE_PAGEFAULT_ENGINE_INSTANCE_MASK,
+				       pf->consumer.engine_class_instance);
 
 	/* Do not report faults on reserved engines */
-	hwe = xe_gt_hw_engine(pf->gt, pf->consumer.engine_class,
-			      pf->consumer.engine_instance, false);
+	hwe = xe_gt_hw_engine(pf->gt, engine_class, engine_instance, false);
 	if (!hwe || xe_hw_engine_is_reserved(hwe))
 		return;
 
-- 
2.34.1