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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 
bochsfb_mmap(struct fb_info * info,struct vm_area_struct * vma)12 static 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 
23 static struct fb_ops bochsfb_ops = {
24 	.owner = THIS_MODULE,
25 	.fb_check_var = drm_fb_helper_check_var,
26 	.fb_set_par = drm_fb_helper_set_par,
27 	.fb_fillrect = drm_fb_helper_sys_fillrect,
28 	.fb_copyarea = drm_fb_helper_sys_copyarea,
29 	.fb_imageblit = drm_fb_helper_sys_imageblit,
30 	.fb_pan_display = drm_fb_helper_pan_display,
31 	.fb_blank = drm_fb_helper_blank,
32 	.fb_setcmap = drm_fb_helper_setcmap,
33 	.fb_mmap = bochsfb_mmap,
34 };
35 
bochsfb_create_object(struct bochs_device * bochs,const struct drm_mode_fb_cmd2 * mode_cmd,struct drm_gem_object ** gobj_p)36 static int bochsfb_create_object(struct bochs_device *bochs,
37 				 const struct drm_mode_fb_cmd2 *mode_cmd,
38 				 struct drm_gem_object **gobj_p)
39 {
40 	struct drm_device *dev = bochs->dev;
41 	struct drm_gem_object *gobj;
42 	u32 size;
43 	int ret = 0;
44 
45 	size = mode_cmd->pitches[0] * mode_cmd->height;
46 	ret = bochs_gem_create(dev, size, true, &gobj);
47 	if (ret)
48 		return ret;
49 
50 	*gobj_p = gobj;
51 	return ret;
52 }
53 
bochsfb_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)54 static int bochsfb_create(struct drm_fb_helper *helper,
55 			  struct drm_fb_helper_surface_size *sizes)
56 {
57 	struct bochs_device *bochs =
58 		container_of(helper, struct bochs_device, fb.helper);
59 	struct fb_info *info;
60 	struct drm_framebuffer *fb;
61 	struct drm_mode_fb_cmd2 mode_cmd;
62 	struct drm_gem_object *gobj = NULL;
63 	struct bochs_bo *bo = NULL;
64 	int size, ret;
65 
66 	if (sizes->surface_bpp != 32)
67 		return -EINVAL;
68 
69 	mode_cmd.width = sizes->surface_width;
70 	mode_cmd.height = sizes->surface_height;
71 	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
72 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
73 							  sizes->surface_depth);
74 	size = mode_cmd.pitches[0] * mode_cmd.height;
75 
76 	/* alloc, pin & map bo */
77 	ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
78 	if (ret) {
79 		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
80 		return ret;
81 	}
82 
83 	bo = gem_to_bochs_bo(gobj);
84 
85 	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
86 	if (ret)
87 		return ret;
88 
89 	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
90 	if (ret) {
91 		DRM_ERROR("failed to pin fbcon\n");
92 		ttm_bo_unreserve(&bo->bo);
93 		return ret;
94 	}
95 
96 	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
97 			  &bo->kmap);
98 	if (ret) {
99 		DRM_ERROR("failed to kmap fbcon\n");
100 		ttm_bo_unreserve(&bo->bo);
101 		return ret;
102 	}
103 
104 	ttm_bo_unreserve(&bo->bo);
105 
106 	/* init fb device */
107 	info = drm_fb_helper_alloc_fbi(helper);
108 	if (IS_ERR(info))
109 		return PTR_ERR(info);
110 
111 	info->par = &bochs->fb.helper;
112 
113 	ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
114 	if (ret) {
115 		drm_fb_helper_release_fbi(helper);
116 		return ret;
117 	}
118 
119 	bochs->fb.size = size;
120 
121 	/* setup helper */
122 	fb = &bochs->fb.gfb.base;
123 	bochs->fb.helper.fb = fb;
124 
125 	strcpy(info->fix.id, "bochsdrmfb");
126 
127 	info->flags = FBINFO_DEFAULT;
128 	info->fbops = &bochsfb_ops;
129 
130 	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
131 	drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
132 			       sizes->fb_height);
133 
134 	info->screen_base = bo->kmap.virtual;
135 	info->screen_size = size;
136 
137 	drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
138 	info->fix.smem_start = 0;
139 	info->fix.smem_len = size;
140 
141 	return 0;
142 }
143 
bochs_fbdev_destroy(struct bochs_device * bochs)144 static int bochs_fbdev_destroy(struct bochs_device *bochs)
145 {
146 	struct bochs_framebuffer *gfb = &bochs->fb.gfb;
147 
148 	DRM_DEBUG_DRIVER("\n");
149 
150 	drm_fb_helper_unregister_fbi(&bochs->fb.helper);
151 	drm_fb_helper_release_fbi(&bochs->fb.helper);
152 
153 	if (gfb->obj) {
154 		drm_gem_object_unreference_unlocked(gfb->obj);
155 		gfb->obj = NULL;
156 	}
157 
158 	drm_fb_helper_fini(&bochs->fb.helper);
159 	drm_framebuffer_unregister_private(&gfb->base);
160 	drm_framebuffer_cleanup(&gfb->base);
161 
162 	return 0;
163 }
164 
165 static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
166 	.fb_probe = bochsfb_create,
167 };
168 
bochs_fbdev_init(struct bochs_device * bochs)169 int bochs_fbdev_init(struct bochs_device *bochs)
170 {
171 	int ret;
172 
173 	drm_fb_helper_prepare(bochs->dev, &bochs->fb.helper,
174 			      &bochs_fb_helper_funcs);
175 
176 	ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper,
177 				 1, 1);
178 	if (ret)
179 		return ret;
180 
181 	ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
182 	if (ret)
183 		goto fini;
184 
185 	drm_helper_disable_unused_functions(bochs->dev);
186 
187 	ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
188 	if (ret)
189 		goto fini;
190 
191 	bochs->fb.initialized = true;
192 	return 0;
193 
194 fini:
195 	drm_fb_helper_fini(&bochs->fb.helper);
196 	return ret;
197 }
198 
bochs_fbdev_fini(struct bochs_device * bochs)199 void bochs_fbdev_fini(struct bochs_device *bochs)
200 {
201 	if (!bochs->fb.initialized)
202 		return;
203 
204 	bochs_fbdev_destroy(bochs);
205 	bochs->fb.initialized = false;
206 }
207