drm/i915: add VMA to parent interface

It's unclear what the direction of the VMA abstraction in the parent
interface should be, but convert i915_vma_fence_id() to parent interface
for starters. This paves the way for making struct i915_vma opaque
towards display.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/036f4b2d20cc1b0a7ab814beb5bb914c53b6eb53.1772212579.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -45,7 +45,6 @@
 #include <drm/drm_fourcc.h>
 #include <drm/drm_print.h>
 
-#include "i915_vma.h"
 #include "i9xx_plane_regs.h"
 #include "intel_de.h"
 #include "intel_display_device.h"
@@ -1463,7 +1462,7 @@ static void intel_fbc_update_state(struct intel_atomic_state *state,
 		    !intel_fbc_has_fences(display));
 
 	if (plane_state->flags & PLANE_HAS_FENCE)
-		fbc_state->fence_id =  i915_vma_fence_id(plane_state->ggtt_vma);
+		fbc_state->fence_id = intel_parent_vma_fence_id(display, plane_state->ggtt_vma);
 	else
 		fbc_state->fence_id = -1;
 
@@ -1490,7 +1489,7 @@ static bool intel_fbc_is_fence_ok(const struct intel_plane_state *plane_state)
 	 */
 	return DISPLAY_VER(display) >= 9 ||
 		(plane_state->flags & PLANE_HAS_FENCE &&
-		 i915_vma_fence_id(plane_state->ggtt_vma) != -1);
+		 intel_parent_vma_fence_id(display, plane_state->ggtt_vma) != -1);
 }
 
 static bool intel_fbc_is_cfb_ok(const struct intel_plane_state *plane_state)

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

@@ -317,6 +317,15 @@ void intel_parent_stolen_node_free(struct intel_display *display, const struct i
 	display->parent->stolen->node_free(node);
 }
 
+/* vma */
+int intel_parent_vma_fence_id(struct intel_display *display, const struct i915_vma *vma)
+{
+	if (!display->parent->vma)
+		return -1;
+
+	return display->parent->vma->fence_id(vma);
+}
+
 /* generic */
 void intel_parent_fence_priority_display(struct intel_display *display, struct dma_fence *fence)
 {

drivers/gpu/drm/i915/display/intel_parent.h

@@ -102,6 +102,9 @@ u64 intel_parent_stolen_node_size(struct intel_display *display, const struct in
 struct intel_stolen_node *intel_parent_stolen_node_alloc(struct intel_display *display);
 void intel_parent_stolen_node_free(struct intel_display *display, const struct intel_stolen_node *node);
 
+/* vma */
+int intel_parent_vma_fence_id(struct intel_display *display, const struct i915_vma *vma);
+
 /* generic */
 bool intel_parent_has_auxccs(struct intel_display *display);
 bool intel_parent_has_fenced_regions(struct intel_display *display);

drivers/gpu/drm/i915/i915_driver.c

@@ -775,6 +775,7 @@ static const struct intel_display_parent_interface parent = {
 	.rpm = &i915_display_rpm_interface,
 	.rps = &i915_display_rps_interface,
 	.stolen = &i915_display_stolen_interface,
+	.vma = &i915_display_vma_interface,
 
 	.fence_priority_display = fence_priority_display,
 	.has_auxccs = has_auxccs,

drivers/gpu/drm/i915/i915_vma.c

@@ -27,6 +27,7 @@
 
 #include <drm/drm_gem.h>
 #include <drm/drm_print.h>
+#include <drm/intel/display_parent_interface.h>
 
 #include "display/intel_fb.h"
 #include "display/intel_frontbuffer.h"
@@ -2332,3 +2333,12 @@ int __init i915_vma_module_init(void)
 
 	return 0;
 }
+
+static int i915_vma_fence_id(const struct i915_vma *vma)
+{
+	return vma->fence ? vma->fence->id : -1;
+}
+
+const struct intel_display_vma_interface i915_display_vma_interface = {
+	.fence_id = i915_vma_fence_id,
+};

drivers/gpu/drm/i915/i915_vma.h

@@ -404,11 +404,6 @@ i915_vma_unpin_fence(struct i915_vma *vma)
 		__i915_vma_unpin_fence(vma);
 }
 
-static inline int i915_vma_fence_id(const struct i915_vma *vma)
-{
-	return vma->fence ? vma->fence->id : -1;
-}
-
 void i915_vma_parked(struct intel_gt *gt);
 
 static inline bool i915_vma_is_scanout(const struct i915_vma *vma)
@@ -481,4 +476,6 @@ int i915_vma_module_init(void);
 I915_SELFTEST_DECLARE(int i915_vma_get_pages(struct i915_vma *vma));
 I915_SELFTEST_DECLARE(void i915_vma_put_pages(struct i915_vma *vma));
 
+extern const struct intel_display_vma_interface i915_display_vma_interface;
+
 #endif

drivers/gpu/drm/xe/compat-i915-headers/i915_vma.h

@@ -26,8 +26,6 @@ struct i915_vma {
 	struct xe_ggtt_node *node;
 };
 
-#define i915_vma_fence_id(vma) -1
-
 static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
 {
 	return xe_ggtt_node_addr(vma->node);

include/drm/intel/display_parent_interface.h

@@ -149,6 +149,10 @@ struct intel_display_stolen_interface {
 	void (*node_free)(const struct intel_stolen_node *node);
 };
 
+struct intel_display_vma_interface {
+	int (*fence_id)(const struct i915_vma *vma);
+};
+
 /**
  * struct intel_display_parent_interface - services parent driver provides to display
  *
@@ -198,6 +202,9 @@ struct intel_display_parent_interface {
 	/** @stolen: Stolen memory. */
 	const struct intel_display_stolen_interface *stolen;
 
+	/** @vma: VMA interface. Optional. */
+	const struct intel_display_vma_interface *vma;
+
 	/* Generic independent functions */
 	struct {
 		/** @fence_priority_display: Set display priority. Optional. */