drm/i915: Add intel_bo_alloc_framebuffer()

Encapsulate the struct intel_framebuffer into an xe_framebuffer
or i915_framebuffer, and allow to add specific fields for each
variant for the panic use-case.
This is particularly needed to have a struct xe_res_cursor available
to support drm panic on discrete GPU.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250624091501.257661-7-jfalempe@redhat.com
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>

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

@@ -15,6 +15,7 @@
 #include "i9xx_plane.h"
 #include "i9xx_plane_regs.h"
 #include "intel_atomic.h"
+#include "intel_bo.h"
 #include "intel_de.h"
 #include "intel_display_irq.h"
 #include "intel_display_regs.h"
@@ -1174,7 +1175,7 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
 
 	drm_WARN_ON(display->drm, pipe != crtc->pipe);
 
-	intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
+	intel_fb = intel_bo_alloc_framebuffer();
 	if (!intel_fb) {
 		drm_dbg_kms(display->drm, "failed to alloc fb\n");
 		return;

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

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MIT
 /* Copyright © 2024 Intel Corporation */
 
+#include "display/intel_display_types.h"
 #include "gem/i915_gem_mman.h"
 #include "gem/i915_gem_object.h"
 #include "gem/i915_gem_object_frontbuffer.h"
@@ -57,3 +58,8 @@ void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj)
 {
 	i915_debugfs_describe_obj(m, to_intel_bo(obj));
 }
+
+struct intel_framebuffer *intel_bo_alloc_framebuffer(void)
+{
+	return i915_gem_object_alloc_framebuffer();
+}

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

@@ -7,6 +7,7 @@
 #include <linux/types.h>
 
 struct drm_gem_object;
+struct intel_framebuffer;
 struct seq_file;
 struct vm_area_struct;
 
@@ -23,5 +24,6 @@ struct intel_frontbuffer *intel_bo_set_frontbuffer(struct drm_gem_object *obj,
 						   struct intel_frontbuffer *front);
 
 void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj);
+struct intel_framebuffer *intel_bo_alloc_framebuffer(void);
 
 #endif /* __INTEL_BO__ */

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

@@ -2346,7 +2346,7 @@ intel_framebuffer_create(struct drm_gem_object *obj,
 	struct intel_framebuffer *intel_fb;
 	int ret;
 
-	intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
+	intel_fb = intel_bo_alloc_framebuffer();
 	if (!intel_fb)
 		return ERR_PTR(-ENOMEM);
 

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

@@ -3029,7 +3029,7 @@ skl_get_initial_plane_config(struct intel_crtc *crtc,
 		return;
 	}
 
-	intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
+	intel_fb = intel_bo_alloc_framebuffer();
 	if (!intel_fb) {
 		drm_dbg_kms(display->drm, "failed to alloc fb\n");
 		return;

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

@@ -17,6 +17,7 @@
 #include "i915_vma_types.h"
 
 enum intel_region_id;
+struct intel_framebuffer;
 
 #define obj_to_i915(obj__) to_i915((obj__)->base.dev)
 
@@ -691,6 +692,7 @@ i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
 int i915_gem_object_truncate(struct drm_i915_gem_object *obj);
 
+struct intel_framebuffer *i915_gem_object_alloc_framebuffer(void);
 /**
  * i915_gem_object_pin_map - return a contiguous mapping of the entire object
  * @obj: the object to map into kernel address space

drivers/gpu/drm/i915/gem/i915_gem_pages.c

@@ -6,6 +6,7 @@
 #include <drm/drm_cache.h>
 #include <linux/vmalloc.h>
 
+#include "display/intel_display_types.h"
 #include "gt/intel_gt.h"
 #include "gt/intel_tlb.h"
 
@@ -354,6 +355,27 @@ static void *i915_gem_object_map_pfn(struct drm_i915_gem_object *obj,
 	return vaddr ?: ERR_PTR(-ENOMEM);
 }
 
+struct i915_panic_data {
+	struct page **pages;
+	int page;
+	void *vaddr;
+};
+
+struct i915_framebuffer {
+	struct intel_framebuffer base;
+	struct i915_panic_data panic;
+};
+
+struct intel_framebuffer *i915_gem_object_alloc_framebuffer(void)
+{
+	struct i915_framebuffer *i915_fb;
+
+	i915_fb = kzalloc(sizeof(*i915_fb), GFP_KERNEL);
+	if (i915_fb)
+		return &i915_fb->base;
+	return NULL;
+}
+
 /* get, pin, and map the pages of the object into kernel space */
 void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 			      enum i915_map_type type)

drivers/gpu/drm/xe/display/intel_bo.c

@@ -3,6 +3,8 @@
 
 #include <drm/drm_gem.h>
 
+#include "intel_display_types.h"
+
 #include "xe_bo.h"
 #include "intel_bo.h"
 
@@ -59,3 +61,25 @@ void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj)
 {
 	/* FIXME */
 }
+
+struct xe_panic_data {
+	struct page **pages;
+	int page;
+	void *vaddr;
+};
+
+struct xe_framebuffer {
+	struct intel_framebuffer base;
+	struct xe_panic_data panic;
+};
+
+struct intel_framebuffer *intel_bo_alloc_framebuffer(void)
+{
+	struct xe_framebuffer *xe_fb;
+
+	xe_fb = kzalloc(sizeof(*xe_fb), GFP_KERNEL);
+	if (xe_fb)
+		return &xe_fb->base;
+	return NULL;
+}
+