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