tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 */
7
8#include "bochs.h"
9
10/* ---------------------------------------------------------------------- */
11
12static int bochsfb_mmap(struct fb_info *info,
13 struct vm_area_struct *vma)
14{
15 struct drm_fb_helper *fb_helper = info->par;
16 struct bochs_device *bochs =
17 container_of(fb_helper, struct bochs_device, fb.helper);
18 struct bochs_bo *bo = gem_to_bochs_bo(bochs->fb.gfb.obj);
19
20 return ttm_fbdev_mmap(vma, &bo->bo);
21}
22
23static struct fb_ops bochsfb_ops = {
24 .owner = THIS_MODULE,
25 DRM_FB_HELPER_DEFAULT_OPS,
26 .fb_fillrect = drm_fb_helper_sys_fillrect,
27 .fb_copyarea = drm_fb_helper_sys_copyarea,
28 .fb_imageblit = drm_fb_helper_sys_imageblit,
29 .fb_mmap = bochsfb_mmap,
30};
31
32static int bochsfb_create_object(struct bochs_device *bochs,
33 const struct drm_mode_fb_cmd2 *mode_cmd,
34 struct drm_gem_object **gobj_p)
35{
36 struct drm_device *dev = bochs->dev;
37 struct drm_gem_object *gobj;
38 u32 size;
39 int ret = 0;
40
41 size = mode_cmd->pitches[0] * mode_cmd->height;
42 ret = bochs_gem_create(dev, size, true, &gobj);
43 if (ret)
44 return ret;
45
46 *gobj_p = gobj;
47 return ret;
48}
49
50static int bochsfb_create(struct drm_fb_helper *helper,
51 struct drm_fb_helper_surface_size *sizes)
52{
53 struct bochs_device *bochs =
54 container_of(helper, struct bochs_device, fb.helper);
55 struct fb_info *info;
56 struct drm_framebuffer *fb;
57 struct drm_mode_fb_cmd2 mode_cmd;
58 struct drm_gem_object *gobj = NULL;
59 struct bochs_bo *bo = NULL;
60 int size, ret;
61
62 if (sizes->surface_bpp != 32)
63 return -EINVAL;
64
65 mode_cmd.width = sizes->surface_width;
66 mode_cmd.height = sizes->surface_height;
67 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
68 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
69 sizes->surface_depth);
70 size = mode_cmd.pitches[0] * mode_cmd.height;
71
72 /* alloc, pin & map bo */
73 ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
74 if (ret) {
75 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
76 return ret;
77 }
78
79 bo = gem_to_bochs_bo(gobj);
80
81 ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
82 if (ret)
83 return ret;
84
85 ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
86 if (ret) {
87 DRM_ERROR("failed to pin fbcon\n");
88 ttm_bo_unreserve(&bo->bo);
89 return ret;
90 }
91
92 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
93 &bo->kmap);
94 if (ret) {
95 DRM_ERROR("failed to kmap fbcon\n");
96 ttm_bo_unreserve(&bo->bo);
97 return ret;
98 }
99
100 ttm_bo_unreserve(&bo->bo);
101
102 /* init fb device */
103 info = drm_fb_helper_alloc_fbi(helper);
104 if (IS_ERR(info))
105 return PTR_ERR(info);
106
107 info->par = &bochs->fb.helper;
108
109 ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
110 if (ret)
111 return ret;
112
113 bochs->fb.size = size;
114
115 /* setup helper */
116 fb = &bochs->fb.gfb.base;
117 bochs->fb.helper.fb = fb;
118
119 strcpy(info->fix.id, "bochsdrmfb");
120
121 info->flags = FBINFO_DEFAULT;
122 info->fbops = &bochsfb_ops;
123
124 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
125 drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
126 sizes->fb_height);
127
128 info->screen_base = bo->kmap.virtual;
129 info->screen_size = size;
130
131 drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
132 info->fix.smem_start = 0;
133 info->fix.smem_len = size;
134
135 bochs->fb.initialized = true;
136 return 0;
137}
138
139static int bochs_fbdev_destroy(struct bochs_device *bochs)
140{
141 struct bochs_framebuffer *gfb = &bochs->fb.gfb;
142
143 DRM_DEBUG_DRIVER("\n");
144
145 drm_fb_helper_unregister_fbi(&bochs->fb.helper);
146
147 if (gfb->obj) {
148 drm_gem_object_unreference_unlocked(gfb->obj);
149 gfb->obj = NULL;
150 }
151
152 drm_framebuffer_unregister_private(&gfb->base);
153 drm_framebuffer_cleanup(&gfb->base);
154
155 return 0;
156}
157
158static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
159 .fb_probe = bochsfb_create,
160};
161
162int bochs_fbdev_init(struct bochs_device *bochs)
163{
164 int ret;
165
166 drm_fb_helper_prepare(bochs->dev, &bochs->fb.helper,
167 &bochs_fb_helper_funcs);
168
169 ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper, 1);
170 if (ret)
171 return ret;
172
173 ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
174 if (ret)
175 goto fini;
176
177 drm_helper_disable_unused_functions(bochs->dev);
178
179 ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
180 if (ret)
181 goto fini;
182
183 return 0;
184
185fini:
186 drm_fb_helper_fini(&bochs->fb.helper);
187 return ret;
188}
189
190void bochs_fbdev_fini(struct bochs_device *bochs)
191{
192 if (bochs->fb.initialized)
193 bochs_fbdev_destroy(bochs);
194
195 if (bochs->fb.helper.fbdev)
196 drm_fb_helper_fini(&bochs->fb.helper);
197
198 bochs->fb.initialized = false;
199}