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_core.h"
12 #include "intel_display_types.h"
13 #include "intel_fb.h"
14 #include "intel_fbdev_fb.h"
15
intel_fbdev_fb_alloc(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)16 struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
17 struct drm_fb_helper_surface_size *sizes)
18 {
19 struct intel_display *display = to_intel_display(helper->dev);
20 struct drm_i915_private *dev_priv = to_i915(display->drm);
21 struct drm_framebuffer *fb;
22 struct drm_mode_fb_cmd2 mode_cmd = {};
23 struct drm_i915_gem_object *obj;
24 int size;
25
26 /* we don't do packed 24bpp */
27 if (sizes->surface_bpp == 24)
28 sizes->surface_bpp = 32;
29
30 mode_cmd.width = sizes->surface_width;
31 mode_cmd.height = sizes->surface_height;
32
33 mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
34 DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
35 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
36 sizes->surface_depth);
37
38 size = mode_cmd.pitches[0] * mode_cmd.height;
39 size = PAGE_ALIGN(size);
40
41 obj = ERR_PTR(-ENODEV);
42 if (HAS_LMEM(dev_priv)) {
43 obj = i915_gem_object_create_lmem(dev_priv, size,
44 I915_BO_ALLOC_CONTIGUOUS |
45 I915_BO_ALLOC_USER);
46 } else {
47 /*
48 * If the FB is too big, just don't use it since fbdev is not very
49 * important and we should probably use that space with FBC or other
50 * features.
51 *
52 * Also skip stolen on MTL as Wa_22018444074 mitigation.
53 */
54 if (!display->platform.meteorlake && size * 2 < dev_priv->dsm.usable_size)
55 obj = i915_gem_object_create_stolen(dev_priv, size);
56 if (IS_ERR(obj))
57 obj = i915_gem_object_create_shmem(dev_priv, size);
58 }
59
60 if (IS_ERR(obj)) {
61 drm_err(display->drm, "failed to allocate framebuffer (%pe)\n", obj);
62 return ERR_PTR(-ENOMEM);
63 }
64
65 fb = intel_framebuffer_create(intel_bo_to_drm_bo(obj),
66 drm_get_format_info(display->drm,
67 mode_cmd.pixel_format,
68 mode_cmd.modifier[0]),
69 &mode_cmd);
70 i915_gem_object_put(obj);
71
72 return to_intel_framebuffer(fb);
73 }
74
intel_fbdev_fb_fill_info(struct intel_display * display,struct fb_info * info,struct drm_gem_object * _obj,struct i915_vma * vma)75 int intel_fbdev_fb_fill_info(struct intel_display *display, struct fb_info *info,
76 struct drm_gem_object *_obj, struct i915_vma *vma)
77 {
78 struct drm_i915_private *i915 = to_i915(display->drm);
79 struct drm_i915_gem_object *obj = to_intel_bo(_obj);
80 struct i915_gem_ww_ctx ww;
81 void __iomem *vaddr;
82 int ret;
83
84 if (i915_gem_object_is_lmem(obj)) {
85 struct intel_memory_region *mem = obj->mm.region;
86
87 /* Use fbdev's framebuffer from lmem for discrete */
88 info->fix.smem_start =
89 (unsigned long)(mem->io.start +
90 i915_gem_object_get_dma_address(obj, 0) -
91 mem->region.start);
92 info->fix.smem_len = obj->base.size;
93 } else {
94 struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
95
96 /* Our framebuffer is the entirety of fbdev's system memory */
97 info->fix.smem_start =
98 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
99 info->fix.smem_len = vma->size;
100 }
101
102 for_i915_gem_ww(&ww, ret, false) {
103 ret = i915_gem_object_lock(vma->obj, &ww);
104
105 if (ret)
106 continue;
107
108 vaddr = i915_vma_pin_iomap(vma);
109 if (IS_ERR(vaddr)) {
110 drm_err(display->drm,
111 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
112 ret = PTR_ERR(vaddr);
113 continue;
114 }
115 }
116
117 if (ret)
118 return ret;
119
120 info->screen_base = vaddr;
121 info->screen_size = intel_bo_to_drm_bo(obj)->size;
122
123 return 0;
124 }
125