drm/i915/guc: Implement no mid batch preemption for multi-lrc

For some users of multi-lrc, e.g. split frame, it isn't safe to preempt
mid BB. To safely enable preemption at the BB boundary, a handshake
between parent and child is needed, syncing the set of BBs at the
beginning and end of each batch. This is implemented via custom
emit_bb_start & emit_fini_breadcrumb functions and enabled by default if
a context is configured by set parallel extension.

Lastly, this patch updates the process descriptor to the correct size as
the memory used in the handshake is directly after the process
descriptor.

v2:
 (John Harrison)
  - Fix a few comments wording
  - Add struture for parent page layout
v3:
 (John Harrison)
  - A structure for sync semaphore
  - Use offsetof to calc address
  - Update commit message
v4:
 (John Harrison)
  - Fix typos in comment explaining memory map of scratch page
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014172005.27155-20-matthew.brost@intel.com

drivers/gpu/drm/i915/gt/intel_context.c

@@ -569,7 +569,7 @@ void intel_context_bind_parent_child(struct intel_context *parent,
 	GEM_BUG_ON(intel_context_is_child(child));
 	GEM_BUG_ON(intel_context_is_parent(child));
 
-	parent->parallel.number_children++;
+	parent->parallel.child_index = parent->parallel.number_children++;
 	list_add_tail(&child->parallel.child_link,
 		      &parent->parallel.child_list);
 	child->parallel.parent = parent;

drivers/gpu/drm/i915/gt/intel_context_types.h

@@ -250,6 +250,8 @@ struct intel_context {
 		struct i915_request *last_rq;
 		/** @number_children: number of children if parent */
 		u8 number_children;
+		/** @child_index: index into child_list if child */
+		u8 child_index;
 		/** @guc: GuC specific members for parallel submission */
 		struct {
 			/** @wqi_head: head pointer in work queue */

drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h

@@ -186,7 +186,7 @@ struct guc_process_desc {
 	u32 wq_status;
 	u32 engine_presence;
 	u32 priority;
-	u32 reserved[30];
+	u32 reserved[36];
 } __packed;
 
 #define CONTEXT_REGISTRATION_FLAG_KMD	BIT(0)