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26#include <drm/drmP.h>
27#include <drm/drm_fb_helper.h>
28#include "virtgpu_drv.h"
29
30#define VIRTIO_GPU_FBCON_POLL_PERIOD (HZ / 60)
31
32struct virtio_gpu_fbdev {
33 struct drm_fb_helper helper;
34 struct virtio_gpu_framebuffer vgfb;
35 struct virtio_gpu_device *vgdev;
36 struct delayed_work work;
37};
38
39static int virtio_gpu_dirty_update(struct virtio_gpu_framebuffer *fb,
40 bool store, int x, int y,
41 int width, int height)
42{
43 struct drm_device *dev = fb->base.dev;
44 struct virtio_gpu_device *vgdev = dev->dev_private;
45 bool store_for_later = false;
46 int bpp = fb->base.bits_per_pixel / 8;
47 int x2, y2;
48 unsigned long flags;
49 struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(fb->obj);
50
51 if ((width <= 0) ||
52 (x + width > fb->base.width) ||
53 (y + height > fb->base.height)) {
54 DRM_DEBUG("values out of range %dx%d+%d+%d, fb %dx%d\n",
55 width, height, x, y,
56 fb->base.width, fb->base.height);
57 return -EINVAL;
58 }
59
60
61
62
63
64
65
66
67 if (in_atomic() || store)
68 store_for_later = true;
69
70 x2 = x + width - 1;
71 y2 = y + height - 1;
72
73 spin_lock_irqsave(&fb->dirty_lock, flags);
74
75 if (fb->y1 < y)
76 y = fb->y1;
77 if (fb->y2 > y2)
78 y2 = fb->y2;
79 if (fb->x1 < x)
80 x = fb->x1;
81 if (fb->x2 > x2)
82 x2 = fb->x2;
83
84 if (store_for_later) {
85 fb->x1 = x;
86 fb->x2 = x2;
87 fb->y1 = y;
88 fb->y2 = y2;
89 spin_unlock_irqrestore(&fb->dirty_lock, flags);
90 return 0;
91 }
92
93 fb->x1 = fb->y1 = INT_MAX;
94 fb->x2 = fb->y2 = 0;
95
96 spin_unlock_irqrestore(&fb->dirty_lock, flags);
97
98 {
99 uint32_t offset;
100 uint32_t w = x2 - x + 1;
101 uint32_t h = y2 - y + 1;
102
103 offset = (y * fb->base.pitches[0]) + x * bpp;
104
105 virtio_gpu_cmd_transfer_to_host_2d(vgdev, obj->hw_res_handle,
106 offset,
107 cpu_to_le32(w),
108 cpu_to_le32(h),
109 cpu_to_le32(x),
110 cpu_to_le32(y),
111 NULL);
112
113 }
114 virtio_gpu_cmd_resource_flush(vgdev, obj->hw_res_handle,
115 x, y, x2 - x + 1, y2 - y + 1);
116 return 0;
117}
118
119int virtio_gpu_surface_dirty(struct virtio_gpu_framebuffer *vgfb,
120 struct drm_clip_rect *clips,
121 unsigned num_clips)
122{
123 struct virtio_gpu_device *vgdev = vgfb->base.dev->dev_private;
124 struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(vgfb->obj);
125 struct drm_clip_rect norect;
126 struct drm_clip_rect *clips_ptr;
127 int left, right, top, bottom;
128 int i;
129 int inc = 1;
130 if (!num_clips) {
131 num_clips = 1;
132 clips = &norect;
133 norect.x1 = norect.y1 = 0;
134 norect.x2 = vgfb->base.width;
135 norect.y2 = vgfb->base.height;
136 }
137 left = clips->x1;
138 right = clips->x2;
139 top = clips->y1;
140 bottom = clips->y2;
141
142
143 for (i = 1, clips_ptr = clips + inc;
144 i < num_clips; i++, clips_ptr += inc) {
145 left = min_t(int, left, (int)clips_ptr->x1);
146 right = max_t(int, right, (int)clips_ptr->x2);
147 top = min_t(int, top, (int)clips_ptr->y1);
148 bottom = max_t(int, bottom, (int)clips_ptr->y2);
149 }
150
151 if (obj->dumb)
152 return virtio_gpu_dirty_update(vgfb, false, left, top,
153 right - left, bottom - top);
154
155 virtio_gpu_cmd_resource_flush(vgdev, obj->hw_res_handle,
156 left, top, right - left, bottom - top);
157 return 0;
158}
159
160static void virtio_gpu_fb_dirty_work(struct work_struct *work)
161{
162 struct delayed_work *delayed_work = to_delayed_work(work);
163 struct virtio_gpu_fbdev *vfbdev =
164 container_of(delayed_work, struct virtio_gpu_fbdev, work);
165 struct virtio_gpu_framebuffer *vgfb = &vfbdev->vgfb;
166
167 virtio_gpu_dirty_update(&vfbdev->vgfb, false, vgfb->x1, vgfb->y1,
168 vgfb->x2 - vgfb->x1, vgfb->y2 - vgfb->y1);
169}
170
171static void virtio_gpu_3d_fillrect(struct fb_info *info,
172 const struct fb_fillrect *rect)
173{
174 struct virtio_gpu_fbdev *vfbdev = info->par;
175 drm_fb_helper_sys_fillrect(info, rect);
176 virtio_gpu_dirty_update(&vfbdev->vgfb, true, rect->dx, rect->dy,
177 rect->width, rect->height);
178 schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
179}
180
181static void virtio_gpu_3d_copyarea(struct fb_info *info,
182 const struct fb_copyarea *area)
183{
184 struct virtio_gpu_fbdev *vfbdev = info->par;
185 drm_fb_helper_sys_copyarea(info, area);
186 virtio_gpu_dirty_update(&vfbdev->vgfb, true, area->dx, area->dy,
187 area->width, area->height);
188 schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
189}
190
191static void virtio_gpu_3d_imageblit(struct fb_info *info,
192 const struct fb_image *image)
193{
194 struct virtio_gpu_fbdev *vfbdev = info->par;
195 drm_fb_helper_sys_imageblit(info, image);
196 virtio_gpu_dirty_update(&vfbdev->vgfb, true, image->dx, image->dy,
197 image->width, image->height);
198 schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
199}
200
201static struct fb_ops virtio_gpufb_ops = {
202 .owner = THIS_MODULE,
203 DRM_FB_HELPER_DEFAULT_OPS,
204 .fb_fillrect = virtio_gpu_3d_fillrect,
205 .fb_copyarea = virtio_gpu_3d_copyarea,
206 .fb_imageblit = virtio_gpu_3d_imageblit,
207};
208
209static int virtio_gpu_vmap_fb(struct virtio_gpu_device *vgdev,
210 struct virtio_gpu_object *obj)
211{
212 return virtio_gpu_object_kmap(obj, NULL);
213}
214
215static int virtio_gpufb_create(struct drm_fb_helper *helper,
216 struct drm_fb_helper_surface_size *sizes)
217{
218 struct virtio_gpu_fbdev *vfbdev =
219 container_of(helper, struct virtio_gpu_fbdev, helper);
220 struct drm_device *dev = helper->dev;
221 struct virtio_gpu_device *vgdev = dev->dev_private;
222 struct fb_info *info;
223 struct drm_framebuffer *fb;
224 struct drm_mode_fb_cmd2 mode_cmd = {};
225 struct virtio_gpu_object *obj;
226 uint32_t resid, format, size;
227 int ret;
228
229 mode_cmd.width = sizes->surface_width;
230 mode_cmd.height = sizes->surface_height;
231 mode_cmd.pitches[0] = mode_cmd.width * 4;
232 mode_cmd.pixel_format = drm_mode_legacy_fb_format(32, 24);
233
234 format = virtio_gpu_translate_format(mode_cmd.pixel_format);
235 if (format == 0)
236 return -EINVAL;
237
238 size = mode_cmd.pitches[0] * mode_cmd.height;
239 obj = virtio_gpu_alloc_object(dev, size, false, true);
240 if (IS_ERR(obj))
241 return PTR_ERR(obj);
242
243 virtio_gpu_resource_id_get(vgdev, &resid);
244 virtio_gpu_cmd_create_resource(vgdev, resid, format,
245 mode_cmd.width, mode_cmd.height);
246
247 ret = virtio_gpu_vmap_fb(vgdev, obj);
248 if (ret) {
249 DRM_ERROR("failed to vmap fb %d\n", ret);
250 goto err_obj_vmap;
251 }
252
253
254 ret = virtio_gpu_object_attach(vgdev, obj, resid, NULL);
255 if (ret)
256 goto err_obj_attach;
257
258 info = drm_fb_helper_alloc_fbi(helper);
259 if (IS_ERR(info)) {
260 ret = PTR_ERR(info);
261 goto err_fb_alloc;
262 }
263
264 info->par = helper;
265
266 ret = virtio_gpu_framebuffer_init(dev, &vfbdev->vgfb,
267 &mode_cmd, &obj->gem_base);
268 if (ret)
269 goto err_fb_init;
270
271 fb = &vfbdev->vgfb.base;
272
273 vfbdev->helper.fb = fb;
274
275 strcpy(info->fix.id, "virtiodrmfb");
276 info->flags = FBINFO_DEFAULT;
277 info->fbops = &virtio_gpufb_ops;
278 info->pixmap.flags = FB_PIXMAP_SYSTEM;
279
280 info->screen_base = obj->vmap;
281 info->screen_size = obj->gem_base.size;
282 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
283 drm_fb_helper_fill_var(info, &vfbdev->helper,
284 sizes->fb_width, sizes->fb_height);
285
286 info->fix.mmio_start = 0;
287 info->fix.mmio_len = 0;
288 return 0;
289
290err_fb_init:
291 drm_fb_helper_release_fbi(helper);
292err_fb_alloc:
293 virtio_gpu_cmd_resource_inval_backing(vgdev, resid);
294err_obj_attach:
295err_obj_vmap:
296 virtio_gpu_gem_free_object(&obj->gem_base);
297 return ret;
298}
299
300static int virtio_gpu_fbdev_destroy(struct drm_device *dev,
301 struct virtio_gpu_fbdev *vgfbdev)
302{
303 struct virtio_gpu_framebuffer *vgfb = &vgfbdev->vgfb;
304
305 drm_fb_helper_unregister_fbi(&vgfbdev->helper);
306 drm_fb_helper_release_fbi(&vgfbdev->helper);
307
308 if (vgfb->obj)
309 vgfb->obj = NULL;
310 drm_fb_helper_fini(&vgfbdev->helper);
311 drm_framebuffer_cleanup(&vgfb->base);
312
313 return 0;
314}
315static struct drm_fb_helper_funcs virtio_gpu_fb_helper_funcs = {
316 .fb_probe = virtio_gpufb_create,
317};
318
319int virtio_gpu_fbdev_init(struct virtio_gpu_device *vgdev)
320{
321 struct virtio_gpu_fbdev *vgfbdev;
322 int bpp_sel = 32;
323 int ret;
324
325 vgfbdev = kzalloc(sizeof(struct virtio_gpu_fbdev), GFP_KERNEL);
326 if (!vgfbdev)
327 return -ENOMEM;
328
329 vgfbdev->vgdev = vgdev;
330 vgdev->vgfbdev = vgfbdev;
331 INIT_DELAYED_WORK(&vgfbdev->work, virtio_gpu_fb_dirty_work);
332
333 drm_fb_helper_prepare(vgdev->ddev, &vgfbdev->helper,
334 &virtio_gpu_fb_helper_funcs);
335 ret = drm_fb_helper_init(vgdev->ddev, &vgfbdev->helper,
336 vgdev->num_scanouts,
337 VIRTIO_GPUFB_CONN_LIMIT);
338 if (ret) {
339 kfree(vgfbdev);
340 return ret;
341 }
342
343 drm_fb_helper_single_add_all_connectors(&vgfbdev->helper);
344 drm_fb_helper_initial_config(&vgfbdev->helper, bpp_sel);
345 return 0;
346}
347
348void virtio_gpu_fbdev_fini(struct virtio_gpu_device *vgdev)
349{
350 if (!vgdev->vgfbdev)
351 return;
352
353 virtio_gpu_fbdev_destroy(vgdev->ddev, vgdev->vgfbdev);
354 kfree(vgdev->vgfbdev);
355 vgdev->vgfbdev = NULL;
356}
357
