1 /*
2  * Copyright (C) 2015 Red Hat, Inc.
3  * All Rights Reserved.
4  *
5  * Authors:
6  *    Dave Airlie
7  *    Alon Levy
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included in
17  * all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25  * OTHER DEALINGS IN THE SOFTWARE.
26  */
27 
28 #include "virtgpu_drv.h"
29 #include <drm/drm_crtc_helper.h>
30 #include <drm/drm_atomic_helper.h>
31 
32 #define XRES_MIN    32
33 #define YRES_MIN    32
34 
35 #define XRES_DEF  1024
36 #define YRES_DEF   768
37 
38 #define XRES_MAX  8192
39 #define YRES_MAX  8192
40 
41 static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
42 	.set_config             = drm_atomic_helper_set_config,
43 	.destroy                = drm_crtc_cleanup,
44 
45 	.page_flip              = drm_atomic_helper_page_flip,
46 	.reset                  = drm_atomic_helper_crtc_reset,
47 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
48 	.atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
49 };
50 
51 static void virtio_gpu_user_framebuffer_destroy(struct drm_framebuffer *fb)
52 {
53 	struct virtio_gpu_framebuffer *virtio_gpu_fb
54 		= to_virtio_gpu_framebuffer(fb);
55 
56 	drm_gem_object_put_unlocked(virtio_gpu_fb->obj);
57 	drm_framebuffer_cleanup(fb);
58 	kfree(virtio_gpu_fb);
59 }
60 
61 static int
62 virtio_gpu_framebuffer_surface_dirty(struct drm_framebuffer *fb,
63 				     struct drm_file *file_priv,
64 				     unsigned flags, unsigned color,
65 				     struct drm_clip_rect *clips,
66 				     unsigned num_clips)
67 {
68 	struct virtio_gpu_framebuffer *virtio_gpu_fb
69 		= to_virtio_gpu_framebuffer(fb);
70 
71 	return virtio_gpu_surface_dirty(virtio_gpu_fb, clips, num_clips);
72 }
73 
74 static int
75 virtio_gpu_framebuffer_create_handle(struct drm_framebuffer *fb,
76 				     struct drm_file *file_priv,
77 				     unsigned int *handle)
78 {
79 	struct virtio_gpu_framebuffer *virtio_gpu_fb =
80 		to_virtio_gpu_framebuffer(fb);
81 
82 	return drm_gem_handle_create(file_priv, virtio_gpu_fb->obj, handle);
83 }
84 
85 static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
86 	.create_handle = virtio_gpu_framebuffer_create_handle,
87 	.destroy = virtio_gpu_user_framebuffer_destroy,
88 	.dirty = virtio_gpu_framebuffer_surface_dirty,
89 };
90 
91 int
92 virtio_gpu_framebuffer_init(struct drm_device *dev,
93 			    struct virtio_gpu_framebuffer *vgfb,
94 			    const struct drm_mode_fb_cmd2 *mode_cmd,
95 			    struct drm_gem_object *obj)
96 {
97 	int ret;
98 	struct virtio_gpu_object *bo;
99 	vgfb->obj = obj;
100 
101 	bo = gem_to_virtio_gpu_obj(obj);
102 
103 	drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
104 
105 	ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
106 	if (ret) {
107 		vgfb->obj = NULL;
108 		return ret;
109 	}
110 
111 	spin_lock_init(&vgfb->dirty_lock);
112 	vgfb->x1 = vgfb->y1 = INT_MAX;
113 	vgfb->x2 = vgfb->y2 = 0;
114 	return 0;
115 }
116 
117 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
118 {
119 	struct drm_device *dev = crtc->dev;
120 	struct virtio_gpu_device *vgdev = dev->dev_private;
121 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
122 
123 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
124 				   crtc->mode.hdisplay,
125 				   crtc->mode.vdisplay, 0, 0);
126 }
127 
128 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
129 					  struct drm_crtc_state *old_state)
130 {
131 }
132 
133 static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
134 					   struct drm_crtc_state *old_state)
135 {
136 	struct drm_device *dev = crtc->dev;
137 	struct virtio_gpu_device *vgdev = dev->dev_private;
138 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
139 
140 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
141 }
142 
143 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
144 					struct drm_crtc_state *state)
145 {
146 	return 0;
147 }
148 
149 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
150 					 struct drm_crtc_state *old_state)
151 {
152 	unsigned long flags;
153 
154 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
155 	if (crtc->state->event)
156 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
157 	crtc->state->event = NULL;
158 	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
159 }
160 
161 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
162 	.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
163 	.atomic_check  = virtio_gpu_crtc_atomic_check,
164 	.atomic_flush  = virtio_gpu_crtc_atomic_flush,
165 	.atomic_enable = virtio_gpu_crtc_atomic_enable,
166 	.atomic_disable = virtio_gpu_crtc_atomic_disable,
167 };
168 
169 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
170 				    struct drm_display_mode *mode,
171 				    struct drm_display_mode *adjusted_mode)
172 {
173 }
174 
175 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
176 {
177 }
178 
179 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
180 {
181 }
182 
183 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
184 {
185 	struct virtio_gpu_output *output =
186 		drm_connector_to_virtio_gpu_output(connector);
187 	struct drm_display_mode *mode = NULL;
188 	int count, width, height;
189 
190 	width  = le32_to_cpu(output->info.r.width);
191 	height = le32_to_cpu(output->info.r.height);
192 	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
193 
194 	if (width == 0 || height == 0) {
195 		width = XRES_DEF;
196 		height = YRES_DEF;
197 		drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
198 	} else {
199 		DRM_DEBUG("add mode: %dx%d\n", width, height);
200 		mode = drm_cvt_mode(connector->dev, width, height, 60,
201 				    false, false, false);
202 		mode->type |= DRM_MODE_TYPE_PREFERRED;
203 		drm_mode_probed_add(connector, mode);
204 		count++;
205 	}
206 
207 	return count;
208 }
209 
210 static int virtio_gpu_conn_mode_valid(struct drm_connector *connector,
211 				      struct drm_display_mode *mode)
212 {
213 	struct virtio_gpu_output *output =
214 		drm_connector_to_virtio_gpu_output(connector);
215 	int width, height;
216 
217 	width  = le32_to_cpu(output->info.r.width);
218 	height = le32_to_cpu(output->info.r.height);
219 
220 	if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
221 		return MODE_OK;
222 	if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
223 		return MODE_OK;
224 	if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
225 	    mode->vdisplay <= height && mode->vdisplay >= height - 16)
226 		return MODE_OK;
227 
228 	DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
229 	return MODE_BAD;
230 }
231 
232 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
233 	.mode_set   = virtio_gpu_enc_mode_set,
234 	.enable     = virtio_gpu_enc_enable,
235 	.disable    = virtio_gpu_enc_disable,
236 };
237 
238 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
239 	.get_modes    = virtio_gpu_conn_get_modes,
240 	.mode_valid   = virtio_gpu_conn_mode_valid,
241 };
242 
243 static enum drm_connector_status virtio_gpu_conn_detect(
244 			struct drm_connector *connector,
245 			bool force)
246 {
247 	struct virtio_gpu_output *output =
248 		drm_connector_to_virtio_gpu_output(connector);
249 
250 	if (output->info.enabled)
251 		return connector_status_connected;
252 	else
253 		return connector_status_disconnected;
254 }
255 
256 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
257 {
258 	struct virtio_gpu_output *virtio_gpu_output =
259 		drm_connector_to_virtio_gpu_output(connector);
260 
261 	drm_connector_unregister(connector);
262 	drm_connector_cleanup(connector);
263 	kfree(virtio_gpu_output);
264 }
265 
266 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
267 	.detect = virtio_gpu_conn_detect,
268 	.fill_modes = drm_helper_probe_single_connector_modes,
269 	.destroy = virtio_gpu_conn_destroy,
270 	.reset = drm_atomic_helper_connector_reset,
271 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
272 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
273 };
274 
275 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
276 	.destroy = drm_encoder_cleanup,
277 };
278 
279 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
280 {
281 	struct drm_device *dev = vgdev->ddev;
282 	struct virtio_gpu_output *output = vgdev->outputs + index;
283 	struct drm_connector *connector = &output->conn;
284 	struct drm_encoder *encoder = &output->enc;
285 	struct drm_crtc *crtc = &output->crtc;
286 	struct drm_plane *primary, *cursor;
287 
288 	output->index = index;
289 	if (index == 0) {
290 		output->info.enabled = cpu_to_le32(true);
291 		output->info.r.width = cpu_to_le32(XRES_DEF);
292 		output->info.r.height = cpu_to_le32(YRES_DEF);
293 	}
294 
295 	primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
296 	if (IS_ERR(primary))
297 		return PTR_ERR(primary);
298 	cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
299 	if (IS_ERR(cursor))
300 		return PTR_ERR(cursor);
301 	drm_crtc_init_with_planes(dev, crtc, primary, cursor,
302 				  &virtio_gpu_crtc_funcs, NULL);
303 	drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
304 	primary->crtc = crtc;
305 	cursor->crtc = crtc;
306 
307 	drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
308 			   DRM_MODE_CONNECTOR_VIRTUAL);
309 	drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
310 
311 	drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
312 			 DRM_MODE_ENCODER_VIRTUAL, NULL);
313 	drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
314 	encoder->possible_crtcs = 1 << index;
315 
316 	drm_mode_connector_attach_encoder(connector, encoder);
317 	drm_connector_register(connector);
318 	return 0;
319 }
320 
321 static struct drm_framebuffer *
322 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
323 				   struct drm_file *file_priv,
324 				   const struct drm_mode_fb_cmd2 *mode_cmd)
325 {
326 	struct drm_gem_object *obj = NULL;
327 	struct virtio_gpu_framebuffer *virtio_gpu_fb;
328 	int ret;
329 
330 	/* lookup object associated with res handle */
331 	obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
332 	if (!obj)
333 		return ERR_PTR(-EINVAL);
334 
335 	virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
336 	if (virtio_gpu_fb == NULL)
337 		return ERR_PTR(-ENOMEM);
338 
339 	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
340 	if (ret) {
341 		kfree(virtio_gpu_fb);
342 		drm_gem_object_put_unlocked(obj);
343 		return NULL;
344 	}
345 
346 	return &virtio_gpu_fb->base;
347 }
348 
349 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
350 {
351 	struct drm_device *dev = state->dev;
352 
353 	drm_atomic_helper_commit_modeset_disables(dev, state);
354 	drm_atomic_helper_commit_modeset_enables(dev, state);
355 	drm_atomic_helper_commit_planes(dev, state, 0);
356 
357 	drm_atomic_helper_commit_hw_done(state);
358 
359 	drm_atomic_helper_wait_for_vblanks(dev, state);
360 	drm_atomic_helper_cleanup_planes(dev, state);
361 }
362 
363 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
364 	.atomic_commit_tail = vgdev_atomic_commit_tail,
365 };
366 
367 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
368 	.fb_create = virtio_gpu_user_framebuffer_create,
369 	.atomic_check = drm_atomic_helper_check,
370 	.atomic_commit = drm_atomic_helper_commit,
371 };
372 
373 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
374 {
375 	int i;
376 
377 	drm_mode_config_init(vgdev->ddev);
378 	vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
379 	vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
380 
381 	/* modes will be validated against the framebuffer size */
382 	vgdev->ddev->mode_config.min_width = XRES_MIN;
383 	vgdev->ddev->mode_config.min_height = YRES_MIN;
384 	vgdev->ddev->mode_config.max_width = XRES_MAX;
385 	vgdev->ddev->mode_config.max_height = YRES_MAX;
386 
387 	for (i = 0 ; i < vgdev->num_scanouts; ++i)
388 		vgdev_output_init(vgdev, i);
389 
390         drm_mode_config_reset(vgdev->ddev);
391 	return 0;
392 }
393 
394 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
395 {
396 	virtio_gpu_fbdev_fini(vgdev);
397 	drm_mode_config_cleanup(vgdev->ddev);
398 }
399