1/* SPDX-License-Identifier: MIT */
  2/*
  3 * Copyright © 2023 Intel Corporation
  4 */
  5
  6#include <drm/drm_fb_helper.h>
  7
  8#include "gem/i915_gem_lmem.h"
  9
 10#include "i915_drv.h"
 11#include "intel_display_types.h"
 12#include "intel_fb.h"
 13#include "intel_fbdev_fb.h"
 14
 15struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
 16					       struct drm_fb_helper_surface_size *sizes)
 17{
 18	struct drm_framebuffer *fb;
 19	struct drm_device *dev = helper->dev;
 20	struct drm_i915_private *dev_priv = to_i915(dev);
 21	struct drm_mode_fb_cmd2 mode_cmd = {};
 22	struct drm_i915_gem_object *obj;
 23	int size;
 24
 25	/* we don't do packed 24bpp */
 26	if (sizes->surface_bpp == 24)
 27		sizes->surface_bpp = 32;
 28
 29	mode_cmd.width = sizes->surface_width;
 30	mode_cmd.height = sizes->surface_height;
 31
 32	mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 33				    DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 34	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 35							  sizes->surface_depth);
 36
 37	size = mode_cmd.pitches[0] * mode_cmd.height;
 38	size = PAGE_ALIGN(size);
 39
 40	obj = ERR_PTR(-ENODEV);
 41	if (HAS_LMEM(dev_priv)) {
 42		obj = i915_gem_object_create_lmem(dev_priv, size,
 43						  I915_BO_ALLOC_CONTIGUOUS |
 44						  I915_BO_ALLOC_USER);
 45	} else {
 46		/*
 47		 * If the FB is too big, just don't use it since fbdev is not very
 48		 * important and we should probably use that space with FBC or other
 49		 * features.
 50		 *
 51		 * Also skip stolen on MTL as Wa_22018444074 mitigation.
 52		 */
 53		if (!(IS_METEORLAKE(dev_priv)) && size * 2 < dev_priv->dsm.usable_size)
 54			obj = i915_gem_object_create_stolen(dev_priv, size);
 55		if (IS_ERR(obj))
 56			obj = i915_gem_object_create_shmem(dev_priv, size);
 57	}
 58
 59	if (IS_ERR(obj)) {
 60		drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj);
 61		return ERR_PTR(-ENOMEM);
 62	}
 63
 64	fb = intel_framebuffer_create(intel_bo_to_drm_bo(obj), &mode_cmd);
 65	i915_gem_object_put(obj);
 66
 67	return to_intel_framebuffer(fb);
 68}
 69
 70int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info,
 71			     struct drm_gem_object *_obj, struct i915_vma *vma)
 72{
 73	struct drm_i915_gem_object *obj = to_intel_bo(_obj);
 74	struct i915_gem_ww_ctx ww;
 75	void __iomem *vaddr;
 76	int ret;
 77
 78	if (i915_gem_object_is_lmem(obj)) {
 79		struct intel_memory_region *mem = obj->mm.region;
 80
 81		/* Use fbdev's framebuffer from lmem for discrete */
 82		info->fix.smem_start =
 83			(unsigned long)(mem->io.start +
 84					i915_gem_object_get_dma_address(obj, 0) -
 85					mem->region.start);
 86		info->fix.smem_len = obj->base.size;
 87	} else {
 88		struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
 89
 90		/* Our framebuffer is the entirety of fbdev's system memory */
 91		info->fix.smem_start =
 92			(unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
 93		info->fix.smem_len = vma->size;
 94	}
 95
 96	for_i915_gem_ww(&ww, ret, false) {
 97		ret = i915_gem_object_lock(vma->obj, &ww);
 98
 99		if (ret)
100			continue;
101
102		vaddr = i915_vma_pin_iomap(vma);
103		if (IS_ERR(vaddr)) {
104			drm_err(&i915->drm,
105				"Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
106			ret = PTR_ERR(vaddr);
107			continue;
108		}
109	}
110
111	if (ret)
112		return ret;
113
114	info->screen_base = vaddr;
115	info->screen_size = intel_bo_to_drm_bo(obj)->size;
116
117	return 0;
118}