Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
49static 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
59static 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
65static int
66virtio_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
85static 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
97static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
98 struct drm_crtc_state *old_state)
99{
100 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
101
102 output->enabled = true;
103}
104
105static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
106 struct drm_crtc_state *old_state)
107{
108 struct drm_device *dev = crtc->dev;
109 struct virtio_gpu_device *vgdev = dev->dev_private;
110 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
111
112 virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
113 virtio_gpu_notify(vgdev);
114 output->enabled = false;
115}
116
117static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
118 struct drm_crtc_state *state)
119{
120 return 0;
121}
122
123static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
124 struct drm_crtc_state *old_state)
125{
126}
127
128static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
129 .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
130 .atomic_check = virtio_gpu_crtc_atomic_check,
131 .atomic_flush = virtio_gpu_crtc_atomic_flush,
132 .atomic_enable = virtio_gpu_crtc_atomic_enable,
133 .atomic_disable = virtio_gpu_crtc_atomic_disable,
134};
135
136static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
137 struct drm_display_mode *mode,
138 struct drm_display_mode *adjusted_mode)
139{
140}
141
142static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
143{
144}
145
146static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
147{
148}
149
150static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
151{
152 struct virtio_gpu_output *output =
153 drm_connector_to_virtio_gpu_output(connector);
154 struct drm_display_mode *mode = NULL;
155 int count, width, height;
156
157 if (output->edid) {
158 count = drm_add_edid_modes(connector, output->edid);
159 if (count)
160 return count;
161 }
162
163 width = le32_to_cpu(output->info.r.width);
164 height = le32_to_cpu(output->info.r.height);
165 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
166
167 if (width == 0 || height == 0) {
168 width = XRES_DEF;
169 height = YRES_DEF;
170 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
171 } else {
172 DRM_DEBUG("add mode: %dx%d\n", width, height);
173 mode = drm_cvt_mode(connector->dev, width, height, 60,
174 false, false, false);
175 mode->type |= DRM_MODE_TYPE_PREFERRED;
176 drm_mode_probed_add(connector, mode);
177 count++;
178 }
179
180 return count;
181}
182
183static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
184 struct drm_display_mode *mode)
185{
186 struct virtio_gpu_output *output =
187 drm_connector_to_virtio_gpu_output(connector);
188 int width, height;
189
190 width = le32_to_cpu(output->info.r.width);
191 height = le32_to_cpu(output->info.r.height);
192
193 if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
194 return MODE_OK;
195 if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
196 return MODE_OK;
197 if (mode->hdisplay <= width && mode->hdisplay >= width - 16 &&
198 mode->vdisplay <= height && mode->vdisplay >= height - 16)
199 return MODE_OK;
200
201 DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
202 return MODE_BAD;
203}
204
205static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
206 .mode_set = virtio_gpu_enc_mode_set,
207 .enable = virtio_gpu_enc_enable,
208 .disable = virtio_gpu_enc_disable,
209};
210
211static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
212 .get_modes = virtio_gpu_conn_get_modes,
213 .mode_valid = virtio_gpu_conn_mode_valid,
214};
215
216static enum drm_connector_status virtio_gpu_conn_detect(
217 struct drm_connector *connector,
218 bool force)
219{
220 struct virtio_gpu_output *output =
221 drm_connector_to_virtio_gpu_output(connector);
222
223 if (output->info.enabled)
224 return connector_status_connected;
225 else
226 return connector_status_disconnected;
227}
228
229static void virtio_gpu_conn_destroy(struct drm_connector *connector)
230{
231 drm_connector_unregister(connector);
232 drm_connector_cleanup(connector);
233}
234
235static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
236 .detect = virtio_gpu_conn_detect,
237 .fill_modes = drm_helper_probe_single_connector_modes,
238 .destroy = virtio_gpu_conn_destroy,
239 .reset = drm_atomic_helper_connector_reset,
240 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
241 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
242};
243
244static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
245{
246 struct drm_device *dev = vgdev->ddev;
247 struct virtio_gpu_output *output = vgdev->outputs + index;
248 struct drm_connector *connector = &output->conn;
249 struct drm_encoder *encoder = &output->enc;
250 struct drm_crtc *crtc = &output->crtc;
251 struct drm_plane *primary, *cursor;
252
253 output->index = index;
254 if (index == 0) {
255 output->info.enabled = cpu_to_le32(true);
256 output->info.r.width = cpu_to_le32(XRES_DEF);
257 output->info.r.height = cpu_to_le32(YRES_DEF);
258 }
259
260 primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
261 if (IS_ERR(primary))
262 return PTR_ERR(primary);
263 cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
264 if (IS_ERR(cursor))
265 return PTR_ERR(cursor);
266 drm_crtc_init_with_planes(dev, crtc, primary, cursor,
267 &virtio_gpu_crtc_funcs, NULL);
268 drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
269
270 drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
271 DRM_MODE_CONNECTOR_VIRTUAL);
272 drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
273 if (vgdev->has_edid)
274 drm_connector_attach_edid_property(connector);
275
276 drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
277 drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
278 encoder->possible_crtcs = 1 << index;
279
280 drm_connector_attach_encoder(connector, encoder);
281 drm_connector_register(connector);
282 return 0;
283}
284
285static struct drm_framebuffer *
286virtio_gpu_user_framebuffer_create(struct drm_device *dev,
287 struct drm_file *file_priv,
288 const struct drm_mode_fb_cmd2 *mode_cmd)
289{
290 struct drm_gem_object *obj = NULL;
291 struct virtio_gpu_framebuffer *virtio_gpu_fb;
292 int ret;
293
294 if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
295 mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
296 return ERR_PTR(-ENOENT);
297
298 /* lookup object associated with res handle */
299 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
300 if (!obj)
301 return ERR_PTR(-EINVAL);
302
303 virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
304 if (virtio_gpu_fb == NULL)
305 return ERR_PTR(-ENOMEM);
306
307 ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
308 if (ret) {
309 kfree(virtio_gpu_fb);
310 drm_gem_object_put(obj);
311 return NULL;
312 }
313
314 return &virtio_gpu_fb->base;
315}
316
317static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
318 .fb_create = virtio_gpu_user_framebuffer_create,
319 .atomic_check = drm_atomic_helper_check,
320 .atomic_commit = drm_atomic_helper_commit,
321};
322
323void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
324{
325 int i;
326
327 drm_mode_config_init(vgdev->ddev);
328 vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
329 vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
330
331 /* modes will be validated against the framebuffer size */
332 vgdev->ddev->mode_config.min_width = XRES_MIN;
333 vgdev->ddev->mode_config.min_height = YRES_MIN;
334 vgdev->ddev->mode_config.max_width = XRES_MAX;
335 vgdev->ddev->mode_config.max_height = YRES_MAX;
336
337 for (i = 0 ; i < vgdev->num_scanouts; ++i)
338 vgdev_output_init(vgdev, i);
339
340 drm_mode_config_reset(vgdev->ddev);
341}
342
343void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
344{
345 int i;
346
347 for (i = 0 ; i < vgdev->num_scanouts; ++i)
348 kfree(vgdev->outputs[i].edid);
349 drm_mode_config_cleanup(vgdev->ddev);
350}