1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev_fb.c b/drivers/gpu/drm/i915/display/intel_fbdev_fb.c
new file mode 100644
index 000000000000..c3202ba141c5
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_fbdev_fb.c
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include <linux/fb.h>
+
+#include <drm/drm_print.h>
+
+#include "gem/i915_gem_lmem.h"
+
+#include "i915_drv.h"
+#include "intel_fbdev_fb.h"
+
+u32 intel_fbdev_fb_pitch_align(u32 stride)
+{
+	return ALIGN(stride, 64);
+}
+
+struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size)
+{
+	struct drm_i915_private *dev_priv = to_i915(drm);
+	struct drm_i915_gem_object *obj;
+
+	obj = ERR_PTR(-ENODEV);
+	if (HAS_LMEM(dev_priv)) {
+		obj = i915_gem_object_create_lmem(dev_priv, size,
+						  I915_BO_ALLOC_CONTIGUOUS |
+						  I915_BO_ALLOC_USER);
+	} else {
+		/*
+		 * If the FB is too big, just don't use it since fbdev is not very
+		 * important and we should probably use that space with FBC or other
+		 * features.
+		 *
+		 * Also skip stolen on MTL as Wa_22018444074 mitigation.
+		 */
+		if (!IS_METEORLAKE(dev_priv) && size * 2 < dev_priv->dsm.usable_size)
+			obj = i915_gem_object_create_stolen(dev_priv, size);
+		if (IS_ERR(obj))
+			obj = i915_gem_object_create_shmem(dev_priv, size);
+	}
+
+	if (IS_ERR(obj)) {
+		drm_err(drm, "failed to allocate framebuffer (%pe)\n", obj);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	return &obj->base;
+}
+
+void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj)
+{
+	drm_gem_object_put(obj);
+}
+
+int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info,
+			     struct drm_gem_object *_obj, struct i915_vma *vma)
+{
+	struct drm_i915_private *i915 = to_i915(drm);
+	struct drm_i915_gem_object *obj = to_intel_bo(_obj);
+	struct i915_gem_ww_ctx ww;
+	void __iomem *vaddr;
+	int ret;
+
+	if (i915_gem_object_is_lmem(obj)) {
+		struct intel_memory_region *mem = obj->mm.region;
+
+		/* Use fbdev's framebuffer from lmem for discrete */
+		info->fix.smem_start =
+			(unsigned long)(mem->io.start +
+					i915_gem_object_get_dma_address(obj, 0) -
+					mem->region.start);
+		info->fix.smem_len = obj->base.size;
+	} else {
+		struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
+
+		/* Our framebuffer is the entirety of fbdev's system memory */
+		info->fix.smem_start =
+			(unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
+		info->fix.smem_len = vma->size;
+	}
+
+	for_i915_gem_ww(&ww, ret, false) {
+		ret = i915_gem_object_lock(vma->obj, &ww);
+
+		if (ret)
+			continue;
+
+		vaddr = i915_vma_pin_iomap(vma);
+		if (IS_ERR(vaddr)) {
+			drm_err(drm,
+				"Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
+			ret = PTR_ERR(vaddr);
+			continue;
+		}
+	}
+
+	if (ret)
+		return ret;
+
+	info->screen_base = vaddr;
+	info->screen_size = intel_bo_to_drm_bo(obj)->size;
+
+	return 0;
+}