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_print.h>
34#include <drm/drm_probe_helper.h>
35#include <drm/drm_simple_kms_helper.h>
36#include <drm/drm_vblank.h>
37#include <drm/drm_vblank_helper.h>
38
39#include "virtgpu_drv.h"
40
41#define XRES_MIN 32
42#define YRES_MIN 32
43
44#define XRES_DEF 1024
45#define YRES_DEF 768
46
47#define XRES_MAX 8192
48#define YRES_MAX 8192
49
50#define drm_connector_to_virtio_gpu_output(x) \
51 container_of(x, struct virtio_gpu_output, conn)
52
53static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
54 .set_config = drm_atomic_helper_set_config,
55 .destroy = drm_crtc_cleanup,
56
57 .page_flip = drm_atomic_helper_page_flip,
58 .reset = drm_atomic_helper_crtc_reset,
59 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
60 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
61 DRM_CRTC_VBLANK_TIMER_FUNCS,
62};
63
64static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
65 .create_handle = drm_gem_fb_create_handle,
66 .destroy = drm_gem_fb_destroy,
67 .dirty = drm_atomic_helper_dirtyfb,
68};
69
70static int
71virtio_gpu_framebuffer_init(struct drm_device *dev,
72 struct virtio_gpu_framebuffer *vgfb,
73 const struct drm_format_info *info,
74 const struct drm_mode_fb_cmd2 *mode_cmd,
75 struct drm_gem_object *obj)
76{
77 int ret;
78
79 vgfb->base.obj[0] = obj;
80
81 drm_helper_mode_fill_fb_struct(dev, fb: &vgfb->base, info, mode_cmd);
82
83 ret = drm_framebuffer_init(dev, fb: &vgfb->base, funcs: &virtio_gpu_fb_funcs);
84 if (ret) {
85 vgfb->base.obj[0] = NULL;
86 return ret;
87 }
88 return 0;
89}
90
91static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
92{
93 struct drm_device *dev = crtc->dev;
94 struct virtio_gpu_device *vgdev = dev->dev_private;
95 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
96
97 virtio_gpu_cmd_set_scanout(vgdev, scanout_id: output->index, resource_id: 0,
98 width: crtc->mode.hdisplay,
99 height: crtc->mode.vdisplay, x: 0, y: 0);
100 virtio_gpu_notify(vgdev);
101}
102
103static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
104 struct drm_atomic_state *state)
105{
106 drm_crtc_vblank_on(crtc);
107}
108
109static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
110 struct drm_atomic_state *state)
111{
112 struct drm_device *dev = crtc->dev;
113 struct virtio_gpu_device *vgdev = dev->dev_private;
114 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
115
116 drm_crtc_vblank_off(crtc);
117
118 virtio_gpu_cmd_set_scanout(vgdev, scanout_id: output->index, resource_id: 0, width: 0, height: 0, x: 0, y: 0);
119 virtio_gpu_notify(vgdev);
120}
121
122static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
123 struct drm_atomic_state *state)
124{
125 return 0;
126}
127
128static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
129 struct drm_atomic_state *state)
130{
131 struct drm_device *dev = crtc->dev;
132 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
133 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
134 struct drm_pending_vblank_event *event;
135
136 /*
137 * virtio-gpu can't do modeset and plane update operations
138 * independent from each other. So the actual modeset happens
139 * in the plane update callback, and here we just check
140 * whenever we must force the modeset.
141 */
142 if (drm_atomic_crtc_needs_modeset(state: crtc_state))
143 output->needs_modeset = true;
144
145 spin_lock_irq(lock: &dev->event_lock);
146
147 event = crtc_state->event;
148 crtc_state->event = NULL;
149
150 if (event) {
151 if (drm_crtc_vblank_get(crtc) == 0)
152 drm_crtc_arm_vblank_event(crtc, e: event);
153 else
154 drm_crtc_send_vblank_event(crtc, e: event);
155 }
156
157 spin_unlock_irq(lock: &dev->event_lock);
158}
159
160static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
161 .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
162 .atomic_check = virtio_gpu_crtc_atomic_check,
163 .atomic_flush = virtio_gpu_crtc_atomic_flush,
164 .atomic_enable = virtio_gpu_crtc_atomic_enable,
165 .atomic_disable = virtio_gpu_crtc_atomic_disable,
166};
167
168static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
169 struct drm_display_mode *mode,
170 struct drm_display_mode *adjusted_mode)
171{
172}
173
174static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
175{
176}
177
178static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
179{
180}
181
182static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
183{
184 struct virtio_gpu_output *output =
185 drm_connector_to_virtio_gpu_output(connector);
186 struct drm_display_mode *mode = NULL;
187 int count, width, height;
188
189 count = drm_edid_connector_add_modes(connector);
190 if (count)
191 return count;
192
193 width = le32_to_cpu(output->info.r.width);
194 height = le32_to_cpu(output->info.r.height);
195 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
196
197 if (width == 0 || height == 0) {
198 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
199 } else {
200 DRM_DEBUG("add mode: %dx%d\n", width, height);
201 mode = drm_cvt_mode(dev: connector->dev, hdisplay: width, vdisplay: height, vrefresh: 60,
202 reduced: false, interlaced: false, margins: false);
203 if (!mode)
204 return count;
205 mode->type |= DRM_MODE_TYPE_PREFERRED;
206 drm_mode_probed_add(connector, mode);
207 count++;
208 }
209
210 return count;
211}
212
213static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
214 const struct drm_display_mode *mode)
215{
216 struct virtio_gpu_output *output =
217 drm_connector_to_virtio_gpu_output(connector);
218 int width, height;
219
220 width = le32_to_cpu(output->info.r.width);
221 height = le32_to_cpu(output->info.r.height);
222
223 if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
224 return MODE_OK;
225 if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
226 return MODE_OK;
227 if (mode->hdisplay <= width && mode->hdisplay >= width - 16 &&
228 mode->vdisplay <= height && mode->vdisplay >= height - 16)
229 return MODE_OK;
230
231 DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
232 return MODE_BAD;
233}
234
235static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
236 .mode_set = virtio_gpu_enc_mode_set,
237 .enable = virtio_gpu_enc_enable,
238 .disable = virtio_gpu_enc_disable,
239};
240
241static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
242 .get_modes = virtio_gpu_conn_get_modes,
243 .mode_valid = virtio_gpu_conn_mode_valid,
244};
245
246static enum drm_connector_status virtio_gpu_conn_detect(
247 struct drm_connector *connector,
248 bool force)
249{
250 struct virtio_gpu_output *output =
251 drm_connector_to_virtio_gpu_output(connector);
252
253 if (output->info.enabled)
254 return connector_status_connected;
255 else
256 return connector_status_disconnected;
257}
258
259static void virtio_gpu_conn_destroy(struct drm_connector *connector)
260{
261 drm_connector_unregister(connector);
262 drm_connector_cleanup(connector);
263}
264
265static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
266 .detect = virtio_gpu_conn_detect,
267 .fill_modes = drm_helper_probe_single_connector_modes,
268 .destroy = virtio_gpu_conn_destroy,
269 .reset = drm_atomic_helper_connector_reset,
270 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
271 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
272};
273
274static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
275{
276 struct drm_device *dev = vgdev->ddev;
277 struct virtio_gpu_output *output = vgdev->outputs + index;
278 struct drm_connector *connector = &output->conn;
279 struct drm_encoder *encoder = &output->enc;
280 struct drm_crtc *crtc = &output->crtc;
281 struct drm_plane *primary, *cursor;
282 int ret;
283
284 output->index = index;
285 if (index == 0) {
286 output->info.enabled = cpu_to_le32(true);
287 output->info.r.width = cpu_to_le32(XRES_DEF);
288 output->info.r.height = cpu_to_le32(YRES_DEF);
289 }
290
291 primary = virtio_gpu_plane_init(vgdev, type: DRM_PLANE_TYPE_PRIMARY, index);
292 if (IS_ERR(ptr: primary))
293 return PTR_ERR(ptr: primary);
294 cursor = virtio_gpu_plane_init(vgdev, type: DRM_PLANE_TYPE_CURSOR, index);
295 if (IS_ERR(ptr: cursor))
296 return PTR_ERR(ptr: cursor);
297 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
298 funcs: &virtio_gpu_crtc_funcs, NULL);
299 if (ret)
300 return ret;
301 drm_crtc_helper_add(crtc, funcs: &virtio_gpu_crtc_helper_funcs);
302
303 drm_connector_init(dev, connector, funcs: &virtio_gpu_connector_funcs,
304 DRM_MODE_CONNECTOR_VIRTUAL);
305 drm_connector_helper_add(connector, funcs: &virtio_gpu_conn_helper_funcs);
306 if (vgdev->has_edid)
307 drm_connector_attach_edid_property(connector);
308
309 drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
310 drm_encoder_helper_add(encoder, funcs: &virtio_gpu_enc_helper_funcs);
311 encoder->possible_crtcs = 1 << index;
312
313 drm_connector_attach_encoder(connector, encoder);
314 drm_connector_register(connector);
315 return 0;
316}
317
318static struct drm_framebuffer *
319virtio_gpu_user_framebuffer_create(struct drm_device *dev,
320 struct drm_file *file_priv,
321 const struct drm_format_info *info,
322 const struct drm_mode_fb_cmd2 *mode_cmd)
323{
324 struct drm_gem_object *obj = NULL;
325 struct virtio_gpu_framebuffer *virtio_gpu_fb;
326 int ret;
327
328 if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
329 mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
330 return ERR_PTR(error: -ENOENT);
331
332 /* lookup object associated with res handle */
333 obj = drm_gem_object_lookup(filp: file_priv, handle: mode_cmd->handles[0]);
334 if (!obj)
335 return ERR_PTR(error: -EINVAL);
336
337 virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
338 if (virtio_gpu_fb == NULL) {
339 drm_gem_object_put(obj);
340 return ERR_PTR(error: -ENOMEM);
341 }
342
343 ret = virtio_gpu_framebuffer_init(dev, vgfb: virtio_gpu_fb, info, mode_cmd, obj);
344 if (ret) {
345 kfree(objp: virtio_gpu_fb);
346 drm_gem_object_put(obj);
347 return NULL;
348 }
349
350 return &virtio_gpu_fb->base;
351}
352
353static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
354 .fb_create = virtio_gpu_user_framebuffer_create,
355 .atomic_check = drm_atomic_helper_check,
356 .atomic_commit = drm_atomic_helper_commit,
357};
358
359int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
360{
361 int i, ret;
362
363 if (!vgdev->num_scanouts)
364 return 0;
365
366 ret = drmm_mode_config_init(dev: vgdev->ddev);
367 if (ret)
368 return ret;
369
370 vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
371 vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
372
373 /* modes will be validated against the framebuffer size */
374 vgdev->ddev->mode_config.min_width = XRES_MIN;
375 vgdev->ddev->mode_config.min_height = YRES_MIN;
376 vgdev->ddev->mode_config.max_width = XRES_MAX;
377 vgdev->ddev->mode_config.max_height = YRES_MAX;
378
379 vgdev->ddev->mode_config.fb_modifiers_not_supported = true;
380
381 for (i = 0 ; i < vgdev->num_scanouts; ++i)
382 vgdev_output_init(vgdev, index: i);
383
384 ret = drm_vblank_init(dev: vgdev->ddev, num_crtcs: vgdev->num_scanouts);
385 if (ret)
386 return ret;
387
388 drm_mode_config_reset(dev: vgdev->ddev);
389 return 0;
390}
391
392void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
393{
394 int i;
395
396 if (!vgdev->num_scanouts)
397 return;
398
399 for (i = 0 ; i < vgdev->num_scanouts; ++i)
400 drm_edid_free(drm_edid: vgdev->outputs[i].drm_edid);
401}
402

source code of linux/drivers/gpu/drm/virtio/virtgpu_display.c