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