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}
117