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_unreference_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 const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
75 	.destroy = virtio_gpu_user_framebuffer_destroy,
76 	.dirty = virtio_gpu_framebuffer_surface_dirty,
77 };
78 
79 int
80 virtio_gpu_framebuffer_init(struct drm_device *dev,
81 			    struct virtio_gpu_framebuffer *vgfb,
82 			    const struct drm_mode_fb_cmd2 *mode_cmd,
83 			    struct drm_gem_object *obj)
84 {
85 	int ret;
86 	struct virtio_gpu_object *bo;
87 	vgfb->obj = obj;
88 
89 	bo = gem_to_virtio_gpu_obj(obj);
90 
91 	drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
92 
93 	ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
94 	if (ret) {
95 		vgfb->obj = NULL;
96 		return ret;
97 	}
98 
99 	spin_lock_init(&vgfb->dirty_lock);
100 	vgfb->x1 = vgfb->y1 = INT_MAX;
101 	vgfb->x2 = vgfb->y2 = 0;
102 	return 0;
103 }
104 
105 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
106 {
107 	struct drm_device *dev = crtc->dev;
108 	struct virtio_gpu_device *vgdev = dev->dev_private;
109 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
110 
111 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
112 				   crtc->mode.hdisplay,
113 				   crtc->mode.vdisplay, 0, 0);
114 }
115 
116 static void virtio_gpu_crtc_enable(struct drm_crtc *crtc)
117 {
118 }
119 
120 static void virtio_gpu_crtc_disable(struct drm_crtc *crtc)
121 {
122 	struct drm_device *dev = crtc->dev;
123 	struct virtio_gpu_device *vgdev = dev->dev_private;
124 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
125 
126 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
127 }
128 
129 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
130 					struct drm_crtc_state *state)
131 {
132 	return 0;
133 }
134 
135 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
136 					 struct drm_crtc_state *old_state)
137 {
138 	unsigned long flags;
139 
140 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
141 	if (crtc->state->event)
142 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
143 	crtc->state->event = NULL;
144 	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
145 }
146 
147 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
148 	.enable        = virtio_gpu_crtc_enable,
149 	.disable       = virtio_gpu_crtc_disable,
150 	.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
151 	.atomic_check  = virtio_gpu_crtc_atomic_check,
152 	.atomic_flush  = virtio_gpu_crtc_atomic_flush,
153 };
154 
155 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
156 				    struct drm_display_mode *mode,
157 				    struct drm_display_mode *adjusted_mode)
158 {
159 }
160 
161 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
162 {
163 }
164 
165 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
166 {
167 }
168 
169 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
170 {
171 	struct virtio_gpu_output *output =
172 		drm_connector_to_virtio_gpu_output(connector);
173 	struct drm_display_mode *mode = NULL;
174 	int count, width, height;
175 
176 	width  = le32_to_cpu(output->info.r.width);
177 	height = le32_to_cpu(output->info.r.height);
178 	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
179 
180 	if (width == 0 || height == 0) {
181 		width = XRES_DEF;
182 		height = YRES_DEF;
183 		drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
184 	} else {
185 		DRM_DEBUG("add mode: %dx%d\n", width, height);
186 		mode = drm_cvt_mode(connector->dev, width, height, 60,
187 				    false, false, false);
188 		mode->type |= DRM_MODE_TYPE_PREFERRED;
189 		drm_mode_probed_add(connector, mode);
190 		count++;
191 	}
192 
193 	return count;
194 }
195 
196 static int virtio_gpu_conn_mode_valid(struct drm_connector *connector,
197 				      struct drm_display_mode *mode)
198 {
199 	struct virtio_gpu_output *output =
200 		drm_connector_to_virtio_gpu_output(connector);
201 	int width, height;
202 
203 	width  = le32_to_cpu(output->info.r.width);
204 	height = le32_to_cpu(output->info.r.height);
205 
206 	if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
207 		return MODE_OK;
208 	if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
209 		return MODE_OK;
210 	if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
211 	    mode->vdisplay <= height && mode->vdisplay >= height - 16)
212 		return MODE_OK;
213 
214 	DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
215 	return MODE_BAD;
216 }
217 
218 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
219 	.mode_set   = virtio_gpu_enc_mode_set,
220 	.enable     = virtio_gpu_enc_enable,
221 	.disable    = virtio_gpu_enc_disable,
222 };
223 
224 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
225 	.get_modes    = virtio_gpu_conn_get_modes,
226 	.mode_valid   = virtio_gpu_conn_mode_valid,
227 };
228 
229 static enum drm_connector_status virtio_gpu_conn_detect(
230 			struct drm_connector *connector,
231 			bool force)
232 {
233 	struct virtio_gpu_output *output =
234 		drm_connector_to_virtio_gpu_output(connector);
235 
236 	if (output->info.enabled)
237 		return connector_status_connected;
238 	else
239 		return connector_status_disconnected;
240 }
241 
242 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
243 {
244 	struct virtio_gpu_output *virtio_gpu_output =
245 		drm_connector_to_virtio_gpu_output(connector);
246 
247 	drm_connector_unregister(connector);
248 	drm_connector_cleanup(connector);
249 	kfree(virtio_gpu_output);
250 }
251 
252 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
253 	.dpms = drm_atomic_helper_connector_dpms,
254 	.detect = virtio_gpu_conn_detect,
255 	.fill_modes = drm_helper_probe_single_connector_modes,
256 	.destroy = virtio_gpu_conn_destroy,
257 	.reset = drm_atomic_helper_connector_reset,
258 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
259 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
260 };
261 
262 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
263 	.destroy = drm_encoder_cleanup,
264 };
265 
266 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
267 {
268 	struct drm_device *dev = vgdev->ddev;
269 	struct virtio_gpu_output *output = vgdev->outputs + index;
270 	struct drm_connector *connector = &output->conn;
271 	struct drm_encoder *encoder = &output->enc;
272 	struct drm_crtc *crtc = &output->crtc;
273 	struct drm_plane *primary, *cursor;
274 
275 	output->index = index;
276 	if (index == 0) {
277 		output->info.enabled = cpu_to_le32(true);
278 		output->info.r.width = cpu_to_le32(XRES_DEF);
279 		output->info.r.height = cpu_to_le32(YRES_DEF);
280 	}
281 
282 	primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
283 	if (IS_ERR(primary))
284 		return PTR_ERR(primary);
285 	cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
286 	if (IS_ERR(cursor))
287 		return PTR_ERR(cursor);
288 	drm_crtc_init_with_planes(dev, crtc, primary, cursor,
289 				  &virtio_gpu_crtc_funcs, NULL);
290 	drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
291 	primary->crtc = crtc;
292 	cursor->crtc = crtc;
293 
294 	drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
295 			   DRM_MODE_CONNECTOR_VIRTUAL);
296 	drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
297 
298 	drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
299 			 DRM_MODE_ENCODER_VIRTUAL, NULL);
300 	drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
301 	encoder->possible_crtcs = 1 << index;
302 
303 	drm_mode_connector_attach_encoder(connector, encoder);
304 	drm_connector_register(connector);
305 	return 0;
306 }
307 
308 static struct drm_framebuffer *
309 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
310 				   struct drm_file *file_priv,
311 				   const struct drm_mode_fb_cmd2 *mode_cmd)
312 {
313 	struct drm_gem_object *obj = NULL;
314 	struct virtio_gpu_framebuffer *virtio_gpu_fb;
315 	int ret;
316 
317 	/* lookup object associated with res handle */
318 	obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
319 	if (!obj)
320 		return ERR_PTR(-EINVAL);
321 
322 	virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
323 	if (virtio_gpu_fb == NULL)
324 		return ERR_PTR(-ENOMEM);
325 
326 	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
327 	if (ret) {
328 		kfree(virtio_gpu_fb);
329 		drm_gem_object_unreference_unlocked(obj);
330 		return NULL;
331 	}
332 
333 	return &virtio_gpu_fb->base;
334 }
335 
336 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
337 {
338 	struct drm_device *dev = state->dev;
339 
340 	drm_atomic_helper_commit_modeset_disables(dev, state);
341 	drm_atomic_helper_commit_modeset_enables(dev, state);
342 	drm_atomic_helper_commit_planes(dev, state, 0);
343 
344 	drm_atomic_helper_commit_hw_done(state);
345 
346 	drm_atomic_helper_wait_for_vblanks(dev, state);
347 	drm_atomic_helper_cleanup_planes(dev, state);
348 }
349 
350 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
351 	.atomic_commit_tail = vgdev_atomic_commit_tail,
352 };
353 
354 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
355 	.fb_create = virtio_gpu_user_framebuffer_create,
356 	.atomic_check = drm_atomic_helper_check,
357 	.atomic_commit = drm_atomic_helper_commit,
358 };
359 
360 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
361 {
362 	int i;
363 
364 	drm_mode_config_init(vgdev->ddev);
365 	vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
366 	vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
367 
368 	/* modes will be validated against the framebuffer size */
369 	vgdev->ddev->mode_config.min_width = XRES_MIN;
370 	vgdev->ddev->mode_config.min_height = YRES_MIN;
371 	vgdev->ddev->mode_config.max_width = XRES_MAX;
372 	vgdev->ddev->mode_config.max_height = YRES_MAX;
373 
374 	for (i = 0 ; i < vgdev->num_scanouts; ++i)
375 		vgdev_output_init(vgdev, i);
376 
377         drm_mode_config_reset(vgdev->ddev);
378 	return 0;
379 }
380 
381 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
382 {
383 	virtio_gpu_fbdev_fini(vgdev);
384 	drm_mode_config_cleanup(vgdev->ddev);
385 }
386