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