1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2023 Intel Corporation
4 */
5
6#include <linux/fb.h>
7
8#include <drm/drm_print.h>
9
10#include "gem/i915_gem_lmem.h"
11
12#include "i915_drv.h"
13#include "intel_fbdev_fb.h"
14
15u32 intel_fbdev_fb_pitch_align(u32 stride)
16{
17 return ALIGN(stride, 64);
18}
19
20struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size)
21{
22 struct drm_i915_private *dev_priv = to_i915(dev: drm);
23 struct drm_i915_gem_object *obj;
24
25 obj = ERR_PTR(error: -ENODEV);
26 if (HAS_LMEM(dev_priv)) {
27 obj = i915_gem_object_create_lmem(i915: dev_priv, size,
28 I915_BO_ALLOC_CONTIGUOUS |
29 I915_BO_ALLOC_USER);
30 } else {
31 /*
32 * If the FB is too big, just don't use it since fbdev is not very
33 * important and we should probably use that space with FBC or other
34 * features.
35 *
36 * Also skip stolen on MTL as Wa_22018444074 mitigation.
37 */
38 if (!IS_METEORLAKE(dev_priv) && size * 2 < dev_priv->dsm.usable_size)
39 obj = i915_gem_object_create_stolen(i915: dev_priv, size);
40 if (IS_ERR(ptr: obj))
41 obj = i915_gem_object_create_shmem(i915: dev_priv, size);
42 }
43
44 if (IS_ERR(ptr: obj)) {
45 drm_err(drm, "failed to allocate framebuffer (%pe)\n", obj);
46 return ERR_PTR(error: -ENOMEM);
47 }
48
49 return &obj->base;
50}
51
52void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj)
53{
54 drm_gem_object_put(obj);
55}
56
57int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info,
58 struct drm_gem_object *_obj, struct i915_vma *vma)
59{
60 struct drm_i915_private *i915 = to_i915(dev: drm);
61 struct drm_i915_gem_object *obj = to_intel_bo(gem: _obj);
62 struct i915_gem_ww_ctx ww;
63 void __iomem *vaddr;
64 int ret;
65
66 if (i915_gem_object_is_lmem(obj)) {
67 struct intel_memory_region *mem = obj->mm.region;
68
69 /* Use fbdev's framebuffer from lmem for discrete */
70 info->fix.smem_start =
71 (unsigned long)(mem->io.start +
72 i915_gem_object_get_dma_address(obj, 0) -
73 mem->region.start);
74 info->fix.smem_len = obj->base.size;
75 } else {
76 struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
77
78 /* Our framebuffer is the entirety of fbdev's system memory */
79 info->fix.smem_start =
80 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
81 info->fix.smem_len = vma->size;
82 }
83
84 for_i915_gem_ww(&ww, ret, false) {
85 ret = i915_gem_object_lock(obj: vma->obj, ww: &ww);
86
87 if (ret)
88 continue;
89
90 vaddr = i915_vma_pin_iomap(vma);
91 if (IS_ERR(ptr: vaddr)) {
92 drm_err(drm,
93 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
94 ret = PTR_ERR(ptr: vaddr);
95 continue;
96 }
97 }
98
99 if (ret)
100 return ret;
101
102 info->screen_base = vaddr;
103 info->screen_size = intel_bo_to_drm_bo(obj)->size;
104
105 return 0;
106}
107

source code of linux/drivers/gpu/drm/i915/display/intel_fbdev_fb.c