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 <drm/drm_atomic_helper.h>
29 #include <drm/drm_damage_helper.h>
30 #include <drm/drm_fourcc.h>
31 #include <drm/drm_gem_framebuffer_helper.h>
32 #include <drm/drm_probe_helper.h>
33 #include <drm/drm_vblank.h>
34 
35 #include "virtgpu_drv.h"
36 
37 #define XRES_MIN    32
38 #define YRES_MIN    32
39 
40 #define XRES_DEF  1024
41 #define YRES_DEF   768
42 
43 #define XRES_MAX  8192
44 #define YRES_MAX  8192
45 
46 static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
47 	.set_config             = drm_atomic_helper_set_config,
48 	.destroy                = drm_crtc_cleanup,
49 
50 	.page_flip              = drm_atomic_helper_page_flip,
51 	.reset                  = drm_atomic_helper_crtc_reset,
52 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
53 	.atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
54 };
55 
56 static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
57 	.create_handle = drm_gem_fb_create_handle,
58 	.destroy = drm_gem_fb_destroy,
59 	.dirty = drm_atomic_helper_dirtyfb,
60 };
61 
62 int
63 virtio_gpu_framebuffer_init(struct drm_device *dev,
64 			    struct virtio_gpu_framebuffer *vgfb,
65 			    const struct drm_mode_fb_cmd2 *mode_cmd,
66 			    struct drm_gem_object *obj)
67 {
68 	int ret;
69 
70 	vgfb->base.obj[0] = obj;
71 
72 	drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
73 
74 	ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
75 	if (ret) {
76 		vgfb->base.obj[0] = NULL;
77 		return ret;
78 	}
79 	return 0;
80 }
81 
82 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
83 {
84 	struct drm_device *dev = crtc->dev;
85 	struct virtio_gpu_device *vgdev = dev->dev_private;
86 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
87 
88 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
89 				   crtc->mode.hdisplay,
90 				   crtc->mode.vdisplay, 0, 0);
91 }
92 
93 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
94 					  struct drm_crtc_state *old_state)
95 {
96 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
97 
98 	output->enabled = true;
99 }
100 
101 static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
102 					   struct drm_crtc_state *old_state)
103 {
104 	struct drm_device *dev = crtc->dev;
105 	struct virtio_gpu_device *vgdev = dev->dev_private;
106 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
107 
108 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
109 	output->enabled = false;
110 }
111 
112 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
113 					struct drm_crtc_state *state)
114 {
115 	return 0;
116 }
117 
118 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
119 					 struct drm_crtc_state *old_state)
120 {
121 	unsigned long flags;
122 
123 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
124 	if (crtc->state->event)
125 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
126 	crtc->state->event = NULL;
127 	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
128 }
129 
130 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
131 	.mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
132 	.atomic_check  = virtio_gpu_crtc_atomic_check,
133 	.atomic_flush  = virtio_gpu_crtc_atomic_flush,
134 	.atomic_enable = virtio_gpu_crtc_atomic_enable,
135 	.atomic_disable = virtio_gpu_crtc_atomic_disable,
136 };
137 
138 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
139 				    struct drm_display_mode *mode,
140 				    struct drm_display_mode *adjusted_mode)
141 {
142 }
143 
144 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
145 {
146 }
147 
148 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
149 {
150 }
151 
152 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
153 {
154 	struct virtio_gpu_output *output =
155 		drm_connector_to_virtio_gpu_output(connector);
156 	struct drm_display_mode *mode = NULL;
157 	int count, width, height;
158 
159 	if (output->edid) {
160 		count = drm_add_edid_modes(connector, output->edid);
161 		if (count)
162 			return count;
163 	}
164 
165 	width  = le32_to_cpu(output->info.r.width);
166 	height = le32_to_cpu(output->info.r.height);
167 	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
168 
169 	if (width == 0 || height == 0) {
170 		width = XRES_DEF;
171 		height = YRES_DEF;
172 		drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
173 	} else {
174 		DRM_DEBUG("add mode: %dx%d\n", width, height);
175 		mode = drm_cvt_mode(connector->dev, width, height, 60,
176 				    false, false, false);
177 		mode->type |= DRM_MODE_TYPE_PREFERRED;
178 		drm_mode_probed_add(connector, mode);
179 		count++;
180 	}
181 
182 	return count;
183 }
184 
185 static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
186 				      struct drm_display_mode *mode)
187 {
188 	struct virtio_gpu_output *output =
189 		drm_connector_to_virtio_gpu_output(connector);
190 	int width, height;
191 
192 	width  = le32_to_cpu(output->info.r.width);
193 	height = le32_to_cpu(output->info.r.height);
194 
195 	if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
196 		return MODE_OK;
197 	if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
198 		return MODE_OK;
199 	if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
200 	    mode->vdisplay <= height && mode->vdisplay >= height - 16)
201 		return MODE_OK;
202 
203 	DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
204 	return MODE_BAD;
205 }
206 
207 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
208 	.mode_set   = virtio_gpu_enc_mode_set,
209 	.enable     = virtio_gpu_enc_enable,
210 	.disable    = virtio_gpu_enc_disable,
211 };
212 
213 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
214 	.get_modes    = virtio_gpu_conn_get_modes,
215 	.mode_valid   = virtio_gpu_conn_mode_valid,
216 };
217 
218 static enum drm_connector_status virtio_gpu_conn_detect(
219 			struct drm_connector *connector,
220 			bool force)
221 {
222 	struct virtio_gpu_output *output =
223 		drm_connector_to_virtio_gpu_output(connector);
224 
225 	if (output->info.enabled)
226 		return connector_status_connected;
227 	else
228 		return connector_status_disconnected;
229 }
230 
231 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
232 {
233 	drm_connector_unregister(connector);
234 	drm_connector_cleanup(connector);
235 }
236 
237 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
238 	.detect = virtio_gpu_conn_detect,
239 	.fill_modes = drm_helper_probe_single_connector_modes,
240 	.destroy = virtio_gpu_conn_destroy,
241 	.reset = drm_atomic_helper_connector_reset,
242 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
243 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
244 };
245 
246 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
247 	.destroy = drm_encoder_cleanup,
248 };
249 
250 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
251 {
252 	struct drm_device *dev = vgdev->ddev;
253 	struct virtio_gpu_output *output = vgdev->outputs + index;
254 	struct drm_connector *connector = &output->conn;
255 	struct drm_encoder *encoder = &output->enc;
256 	struct drm_crtc *crtc = &output->crtc;
257 	struct drm_plane *primary, *cursor;
258 
259 	output->index = index;
260 	if (index == 0) {
261 		output->info.enabled = cpu_to_le32(true);
262 		output->info.r.width = cpu_to_le32(XRES_DEF);
263 		output->info.r.height = cpu_to_le32(YRES_DEF);
264 	}
265 
266 	primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
267 	if (IS_ERR(primary))
268 		return PTR_ERR(primary);
269 	cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
270 	if (IS_ERR(cursor))
271 		return PTR_ERR(cursor);
272 	drm_crtc_init_with_planes(dev, crtc, primary, cursor,
273 				  &virtio_gpu_crtc_funcs, NULL);
274 	drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
275 
276 	drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
277 			   DRM_MODE_CONNECTOR_VIRTUAL);
278 	drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
279 	if (vgdev->has_edid)
280 		drm_connector_attach_edid_property(connector);
281 
282 	drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
283 			 DRM_MODE_ENCODER_VIRTUAL, NULL);
284 	drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
285 	encoder->possible_crtcs = 1 << index;
286 
287 	drm_connector_attach_encoder(connector, encoder);
288 	drm_connector_register(connector);
289 	return 0;
290 }
291 
292 static struct drm_framebuffer *
293 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
294 				   struct drm_file *file_priv,
295 				   const struct drm_mode_fb_cmd2 *mode_cmd)
296 {
297 	struct drm_gem_object *obj = NULL;
298 	struct virtio_gpu_framebuffer *virtio_gpu_fb;
299 	int ret;
300 
301 	if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
302 	    mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
303 		return ERR_PTR(-ENOENT);
304 
305 	/* lookup object associated with res handle */
306 	obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
307 	if (!obj)
308 		return ERR_PTR(-EINVAL);
309 
310 	virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
311 	if (virtio_gpu_fb == NULL)
312 		return ERR_PTR(-ENOMEM);
313 
314 	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
315 	if (ret) {
316 		kfree(virtio_gpu_fb);
317 		drm_gem_object_put_unlocked(obj);
318 		return NULL;
319 	}
320 
321 	return &virtio_gpu_fb->base;
322 }
323 
324 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
325 {
326 	struct drm_device *dev = state->dev;
327 
328 	drm_atomic_helper_commit_modeset_disables(dev, state);
329 	drm_atomic_helper_commit_modeset_enables(dev, state);
330 	drm_atomic_helper_commit_planes(dev, state, 0);
331 
332 	drm_atomic_helper_commit_hw_done(state);
333 
334 	drm_atomic_helper_wait_for_vblanks(dev, state);
335 	drm_atomic_helper_cleanup_planes(dev, state);
336 }
337 
338 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
339 	.atomic_commit_tail = vgdev_atomic_commit_tail,
340 };
341 
342 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
343 	.fb_create = virtio_gpu_user_framebuffer_create,
344 	.atomic_check = drm_atomic_helper_check,
345 	.atomic_commit = drm_atomic_helper_commit,
346 };
347 
348 void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
349 {
350 	int i;
351 
352 	drm_mode_config_init(vgdev->ddev);
353 	vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
354 	vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
355 	vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
356 
357 	/* modes will be validated against the framebuffer size */
358 	vgdev->ddev->mode_config.min_width = XRES_MIN;
359 	vgdev->ddev->mode_config.min_height = YRES_MIN;
360 	vgdev->ddev->mode_config.max_width = XRES_MAX;
361 	vgdev->ddev->mode_config.max_height = YRES_MAX;
362 
363 	for (i = 0 ; i < vgdev->num_scanouts; ++i)
364 		vgdev_output_init(vgdev, i);
365 
366 	drm_mode_config_reset(vgdev->ddev);
367 }
368 
369 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
370 {
371 	int i;
372 
373 	for (i = 0 ; i < vgdev->num_scanouts; ++i)
374 		kfree(vgdev->outputs[i].edid);
375 	drm_atomic_helper_shutdown(vgdev->ddev);
376 	drm_mode_config_cleanup(vgdev->ddev);
377 }
378