drm/i915: add minimal i915_gem_object_frontbuffer.h

Split out frontbuffer related declarations and static inlines from
gem/i915_gem_object.h into new gem/i915_gem_object_frontbuffer.h.

The main goal is to reduce header interdependencies. With
gem/i915_gem_object.h including display/intel_frontbuffer.h,
modification of the latter causes a whopping 300+ objects to be rebuilt,
while many of the source files actually needing it aren't explicitly
including it at all.

After the change, only 21 objects depend on display/intel_frontbuffer.h,
directly or indirectly.

Cc: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230830085127.2416842-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/i9xx_plane.c

@@ -17,6 +17,7 @@
 #include "intel_display_types.h"
 #include "intel_fb.h"
 #include "intel_fbc.h"
+#include "intel_frontbuffer.h"
 #include "intel_sprite.h"
 
 /* Primary plane formats for gen <= 3 */

drivers/gpu/drm/i915/display/intel_drrs.c

@@ -9,6 +9,7 @@
 #include "intel_de.h"
 #include "intel_display_types.h"
 #include "intel_drrs.h"
+#include "intel_frontbuffer.h"
 #include "intel_panel.h"
 
 /**

drivers/gpu/drm/i915/display/intel_fb.c

@@ -12,6 +12,7 @@
 #include "intel_display_types.h"
 #include "intel_dpt.h"
 #include "intel_fb.h"
+#include "intel_frontbuffer.h"
 
 #define check_array_bounds(i915, a, i) drm_WARN_ON(&(i915)->drm, (i) >= ARRAY_SIZE(a))
 

drivers/gpu/drm/i915/display/intel_frontbuffer.c

@@ -55,6 +55,7 @@
  * cancelled as soon as busyness is detected.
  */
 
+#include "gem/i915_gem_object_frontbuffer.h"
 #include "i915_drv.h"
 #include "intel_display_trace.h"
 #include "intel_display_types.h"

drivers/gpu/drm/i915/display/intel_overlay.c

@@ -29,6 +29,7 @@
 #include <drm/drm_fourcc.h>
 
 #include "gem/i915_gem_internal.h"
+#include "gem/i915_gem_object_frontbuffer.h"
 #include "gem/i915_gem_pm.h"
 #include "gt/intel_gpu_commands.h"
 #include "gt/intel_ring.h"

drivers/gpu/drm/i915/display/intel_plane_initial.c

@@ -9,6 +9,7 @@
 #include "intel_display.h"
 #include "intel_display_types.h"
 #include "intel_fb.h"
+#include "intel_frontbuffer.h"
 #include "intel_plane_initial.h"
 
 static bool

drivers/gpu/drm/i915/display/intel_psr.c

@@ -32,6 +32,7 @@
 #include "intel_display_types.h"
 #include "intel_dp.h"
 #include "intel_dp_aux.h"
+#include "intel_frontbuffer.h"
 #include "intel_hdmi.h"
 #include "intel_psr.h"
 #include "intel_psr_regs.h"

drivers/gpu/drm/i915/display/intel_sprite.c

@@ -45,6 +45,7 @@
 #include "intel_de.h"
 #include "intel_display_types.h"
 #include "intel_fb.h"
+#include "intel_frontbuffer.h"
 #include "intel_sprite.h"
 
 static void i9xx_plane_linear_gamma(u16 gamma[8])

drivers/gpu/drm/i915/display/skl_universal_plane.c

@@ -16,6 +16,7 @@
 #include "intel_display_types.h"
 #include "intel_fb.h"
 #include "intel_fbc.h"
+#include "intel_frontbuffer.h"
 #include "intel_psr.h"
 #include "skl_scaler.h"
 #include "skl_universal_plane.h"

drivers/gpu/drm/i915/gem/i915_gem_clflush.c

@@ -6,11 +6,10 @@
 
 #include <drm/drm_cache.h>
 
-#include "display/intel_frontbuffer.h"
-
 #include "i915_config.h"
 #include "i915_drv.h"
 #include "i915_gem_clflush.h"
+#include "i915_gem_object_frontbuffer.h"
 #include "i915_sw_fence_work.h"
 #include "i915_trace.h"
 

drivers/gpu/drm/i915/gem/i915_gem_domain.c

@@ -5,7 +5,6 @@
  */
 
 #include "display/intel_display.h"
-#include "display/intel_frontbuffer.h"
 #include "gt/intel_gt.h"
 
 #include "i915_drv.h"
@@ -16,6 +15,7 @@
 #include "i915_gem_lmem.h"
 #include "i915_gem_mman.h"
 #include "i915_gem_object.h"
+#include "i915_gem_object_frontbuffer.h"
 #include "i915_vma.h"
 
 #define VTD_GUARD (168u * I915_GTT_PAGE_SIZE) /* 168 or tile-row PTE padding */

drivers/gpu/drm/i915/gem/i915_gem_object.c

@@ -37,6 +37,7 @@
 #include "i915_gem_dmabuf.h"
 #include "i915_gem_mman.h"
 #include "i915_gem_object.h"
+#include "i915_gem_object_frontbuffer.h"
 #include "i915_gem_ttm.h"
 #include "i915_memcpy.h"
 #include "i915_trace.h"

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -11,7 +11,6 @@
 #include <drm/drm_file.h>
 #include <drm/drm_device.h>
 
-#include "display/intel_frontbuffer.h"
 #include "intel_memory_region.h"
 #include "i915_gem_object_types.h"
 #include "i915_gem_gtt.h"
@@ -810,27 +809,6 @@ int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
 				  unsigned int flags,
 				  const struct i915_sched_attr *attr);
 
-void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
-					 enum fb_op_origin origin);
-void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
-					      enum fb_op_origin origin);
-
-static inline void
-i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
-				  enum fb_op_origin origin)
-{
-	if (unlikely(rcu_access_pointer(obj->frontbuffer)))
-		__i915_gem_object_flush_frontbuffer(obj, origin);
-}
-
-static inline void
-i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
-				       enum fb_op_origin origin)
-{
-	if (unlikely(rcu_access_pointer(obj->frontbuffer)))
-		__i915_gem_object_invalidate_frontbuffer(obj, origin);
-}
-
 int i915_gem_object_read_from_page(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size);
 
 bool i915_gem_object_is_shmem(const struct drm_i915_gem_object *obj);
@@ -891,71 +869,4 @@ static inline int i915_gem_object_userptr_validate(struct drm_i915_gem_object *o
 
 #endif
 
-/**
- * i915_gem_object_get_frontbuffer - Get the object's frontbuffer
- * @obj: The object whose frontbuffer to get.
- *
- * Get pointer to object's frontbuffer if such exists. Please note that RCU
- * mechanism is used to handle e.g. ongoing removal of frontbuffer pointer.
- *
- * Return: pointer to object's frontbuffer is such exists or NULL
- */
-static inline struct intel_frontbuffer *
-i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj)
-{
-	struct intel_frontbuffer *front;
-
-	if (likely(!rcu_access_pointer(obj->frontbuffer)))
-		return NULL;
-
-	rcu_read_lock();
-	do {
-		front = rcu_dereference(obj->frontbuffer);
-		if (!front)
-			break;
-
-		if (unlikely(!kref_get_unless_zero(&front->ref)))
-			continue;
-
-		if (likely(front == rcu_access_pointer(obj->frontbuffer)))
-			break;
-
-		intel_frontbuffer_put(front);
-	} while (1);
-	rcu_read_unlock();
-
-	return front;
-}
-
-/**
- * i915_gem_object_set_frontbuffer - Set the object's frontbuffer
- * @obj: The object whose frontbuffer to set.
- * @front: The frontbuffer to set
- *
- * Set object's frontbuffer pointer. If frontbuffer is already set for the
- * object keep it and return it's pointer to the caller. Please note that RCU
- * mechanism is used to handle e.g. ongoing removal of frontbuffer pointer. This
- * function is protected by i915->display.fb_tracking.lock
- *
- * Return: pointer to frontbuffer which was set.
- */
-static inline struct intel_frontbuffer *
-i915_gem_object_set_frontbuffer(struct drm_i915_gem_object *obj,
-				struct intel_frontbuffer *front)
-{
-	struct intel_frontbuffer *cur = front;
-
-	if (!front) {
-		RCU_INIT_POINTER(obj->frontbuffer, NULL);
-	} else if (rcu_access_pointer(obj->frontbuffer)) {
-		cur = rcu_dereference_protected(obj->frontbuffer, true);
-		kref_get(&cur->ref);
-	} else {
-		drm_gem_object_get(intel_bo_to_drm_bo(obj));
-		rcu_assign_pointer(obj->frontbuffer, front);
-	}
-
-	return cur;
-}
-
 #endif

drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h

@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#ifndef __I915_GEM_OBJECT_FRONTBUFFER_H__
+#define __I915_GEM_OBJECT_FRONTBUFFER_H__
+
+#include <linux/kref.h>
+#include <linux/rcupdate.h>
+
+#include "display/intel_frontbuffer.h"
+#include "i915_gem_object_types.h"
+
+void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
+					 enum fb_op_origin origin);
+void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
+					      enum fb_op_origin origin);
+
+static inline void
+i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
+				  enum fb_op_origin origin)
+{
+	if (unlikely(rcu_access_pointer(obj->frontbuffer)))
+		__i915_gem_object_flush_frontbuffer(obj, origin);
+}
+
+static inline void
+i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
+				       enum fb_op_origin origin)
+{
+	if (unlikely(rcu_access_pointer(obj->frontbuffer)))
+		__i915_gem_object_invalidate_frontbuffer(obj, origin);
+}
+
+/**
+ * i915_gem_object_get_frontbuffer - Get the object's frontbuffer
+ * @obj: The object whose frontbuffer to get.
+ *
+ * Get pointer to object's frontbuffer if such exists. Please note that RCU
+ * mechanism is used to handle e.g. ongoing removal of frontbuffer pointer.
+ *
+ * Return: pointer to object's frontbuffer is such exists or NULL
+ */
+static inline struct intel_frontbuffer *
+i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj)
+{
+	struct intel_frontbuffer *front;
+
+	if (likely(!rcu_access_pointer(obj->frontbuffer)))
+		return NULL;
+
+	rcu_read_lock();
+	do {
+		front = rcu_dereference(obj->frontbuffer);
+		if (!front)
+			break;
+
+		if (unlikely(!kref_get_unless_zero(&front->ref)))
+			continue;
+
+		if (likely(front == rcu_access_pointer(obj->frontbuffer)))
+			break;
+
+		intel_frontbuffer_put(front);
+	} while (1);
+	rcu_read_unlock();
+
+	return front;
+}
+
+/**
+ * i915_gem_object_set_frontbuffer - Set the object's frontbuffer
+ * @obj: The object whose frontbuffer to set.
+ * @front: The frontbuffer to set
+ *
+ * Set object's frontbuffer pointer. If frontbuffer is already set for the
+ * object keep it and return it's pointer to the caller. Please note that RCU
+ * mechanism is used to handle e.g. ongoing removal of frontbuffer pointer. This
+ * function is protected by i915->display.fb_tracking.lock
+ *
+ * Return: pointer to frontbuffer which was set.
+ */
+static inline struct intel_frontbuffer *
+i915_gem_object_set_frontbuffer(struct drm_i915_gem_object *obj,
+				struct intel_frontbuffer *front)
+{
+	struct intel_frontbuffer *cur = front;
+
+	if (!front) {
+		RCU_INIT_POINTER(obj->frontbuffer, NULL);
+	} else if (rcu_access_pointer(obj->frontbuffer)) {
+		cur = rcu_dereference_protected(obj->frontbuffer, true);
+		kref_get(&cur->ref);
+	} else {
+		drm_gem_object_get(intel_bo_to_drm_bo(obj));
+		rcu_assign_pointer(obj->frontbuffer, front);
+	}
+
+	return cur;
+}
+
+#endif

drivers/gpu/drm/i915/gem/i915_gem_phys.c

@@ -13,6 +13,7 @@
 #include "gt/intel_gt.h"
 #include "i915_drv.h"
 #include "i915_gem_object.h"
+#include "i915_gem_object_frontbuffer.h"
 #include "i915_gem_region.h"
 #include "i915_gem_tiling.h"
 #include "i915_scatterlist.h"

drivers/gpu/drm/i915/i915_gem.c

@@ -40,12 +40,12 @@
 #include <drm/drm_vma_manager.h>
 
 #include "display/intel_display.h"
-#include "display/intel_frontbuffer.h"
 
 #include "gem/i915_gem_clflush.h"
 #include "gem/i915_gem_context.h"
 #include "gem/i915_gem_ioctls.h"
 #include "gem/i915_gem_mman.h"
+#include "gem/i915_gem_object_frontbuffer.h"
 #include "gem/i915_gem_pm.h"
 #include "gem/i915_gem_region.h"
 #include "gem/i915_gem_userptr.h"

drivers/gpu/drm/i915/i915_vma.c

@@ -29,6 +29,7 @@
 #include "display/intel_display.h"
 #include "display/intel_frontbuffer.h"
 #include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_object_frontbuffer.h"
 #include "gem/i915_gem_tiling.h"
 #include "gt/intel_engine.h"
 #include "gt/intel_engine_heartbeat.h"