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_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
50static 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
60static 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
66static int
67virtio_gpu_framebuffer_init(struct drm_device *dev,
68 struct virtio_gpu_framebuffer *vgfb,
69 const struct drm_format_info *info,
70 const struct drm_mode_fb_cmd2 *mode_cmd,
71 struct drm_gem_object *obj)
72{
73 int ret;
74
75 vgfb->base.obj[0] = obj;
76
77 drm_helper_mode_fill_fb_struct(dev, &vgfb->base, info, mode_cmd);
78
79 ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
80 if (ret) {
81 vgfb->base.obj[0] = NULL;
82 return ret;
83 }
84 return 0;
85}
86
87static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
88{
89 struct drm_device *dev = crtc->dev;
90 struct virtio_gpu_device *vgdev = dev->dev_private;
91 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
92
93 virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
94 crtc->mode.hdisplay,
95 crtc->mode.vdisplay, 0, 0);
96 virtio_gpu_notify(vgdev);
97}
98
99static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
100 struct drm_atomic_state *state)
101{
102}
103
104static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
105 struct drm_atomic_state *state)
106{
107 struct drm_device *dev = crtc->dev;
108 struct virtio_gpu_device *vgdev = dev->dev_private;
109 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
110
111 virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
112 virtio_gpu_notify(vgdev);
113}
114
115static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
116 struct drm_atomic_state *state)
117{
118 return 0;
119}
120
121static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
122 struct drm_atomic_state *state)
123{
124 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
125 crtc);
126 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
127
128 /*
129 * virtio-gpu can't do modeset and plane update operations
130 * independent from each other. So the actual modeset happens
131 * in the plane update callback, and here we just check
132 * whenever we must force the modeset.
133 */
134 if (drm_atomic_crtc_needs_modeset(crtc_state)) {
135 output->needs_modeset = true;
136 }
137}
138
139static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
140 .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
141 .atomic_check = virtio_gpu_crtc_atomic_check,
142 .atomic_flush = virtio_gpu_crtc_atomic_flush,
143 .atomic_enable = virtio_gpu_crtc_atomic_enable,
144 .atomic_disable = virtio_gpu_crtc_atomic_disable,
145};
146
147static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
148 struct drm_display_mode *mode,
149 struct drm_display_mode *adjusted_mode)
150{
151}
152
153static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
154{
155}
156
157static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
158{
159}
160
161static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
162{
163 struct virtio_gpu_output *output =
164 drm_connector_to_virtio_gpu_output(connector);
165 struct drm_display_mode *mode = NULL;
166 int count, width, height;
167
168 count = drm_edid_connector_add_modes(connector);
169 if (count)
170 return count;
171
172 width = le32_to_cpu(output->info.r.width);
173 height = le32_to_cpu(output->info.r.height);
174 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
175
176 if (width == 0 || height == 0) {
177 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
178 } else {
179 DRM_DEBUG("add mode: %dx%d\n", width, height);
180 mode = drm_cvt_mode(connector->dev, width, height, 60,
181 false, false, false);
182 if (!mode)
183 return count;
184 mode->type |= DRM_MODE_TYPE_PREFERRED;
185 drm_mode_probed_add(connector, mode);
186 count++;
187 }
188
189 return count;
190}
191
192static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
193 const struct drm_display_mode *mode)
194{
195 struct virtio_gpu_output *output =
196 drm_connector_to_virtio_gpu_output(connector);
197 int width, height;
198
199 width = le32_to_cpu(output->info.r.width);
200 height = le32_to_cpu(output->info.r.height);
201
202 if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
203 return MODE_OK;
204 if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
205 return MODE_OK;
206 if (mode->hdisplay <= width && mode->hdisplay >= width - 16 &&
207 mode->vdisplay <= height && mode->vdisplay >= height - 16)
208 return MODE_OK;
209
210 DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
211 return MODE_BAD;
212}
213
214static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
215 .mode_set = virtio_gpu_enc_mode_set,
216 .enable = virtio_gpu_enc_enable,
217 .disable = virtio_gpu_enc_disable,
218};
219
220static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
221 .get_modes = virtio_gpu_conn_get_modes,
222 .mode_valid = virtio_gpu_conn_mode_valid,
223};
224
225static enum drm_connector_status virtio_gpu_conn_detect(
226 struct drm_connector *connector,
227 bool force)
228{
229 struct virtio_gpu_output *output =
230 drm_connector_to_virtio_gpu_output(connector);
231
232 if (output->info.enabled)
233 return connector_status_connected;
234 else
235 return connector_status_disconnected;
236}
237
238static void virtio_gpu_conn_destroy(struct drm_connector *connector)
239{
240 drm_connector_unregister(connector);
241 drm_connector_cleanup(connector);
242}
243
244static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
245 .detect = virtio_gpu_conn_detect,
246 .fill_modes = drm_helper_probe_single_connector_modes,
247 .destroy = virtio_gpu_conn_destroy,
248 .reset = drm_atomic_helper_connector_reset,
249 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
250 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
251};
252
253static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
254{
255 struct drm_device *dev = vgdev->ddev;
256 struct virtio_gpu_output *output = vgdev->outputs + index;
257 struct drm_connector *connector = &output->conn;
258 struct drm_encoder *encoder = &output->enc;
259 struct drm_crtc *crtc = &output->crtc;
260 struct drm_plane *primary, *cursor;
261
262 output->index = index;
263 if (index == 0) {
264 output->info.enabled = cpu_to_le32(true);
265 output->info.r.width = cpu_to_le32(XRES_DEF);
266 output->info.r.height = cpu_to_le32(YRES_DEF);
267 }
268
269 primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
270 if (IS_ERR(primary))
271 return PTR_ERR(primary);
272 cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
273 if (IS_ERR(cursor))
274 return PTR_ERR(cursor);
275 drm_crtc_init_with_planes(dev, crtc, primary, cursor,
276 &virtio_gpu_crtc_funcs, NULL);
277 drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
278
279 drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
280 DRM_MODE_CONNECTOR_VIRTUAL);
281 drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
282 if (vgdev->has_edid)
283 drm_connector_attach_edid_property(connector);
284
285 drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
286 drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
287 encoder->possible_crtcs = 1 << index;
288
289 drm_connector_attach_encoder(connector, encoder);
290 drm_connector_register(connector);
291 return 0;
292}
293
294static struct drm_framebuffer *
295virtio_gpu_user_framebuffer_create(struct drm_device *dev,
296 struct drm_file *file_priv,
297 const struct drm_format_info *info,
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, info, 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
329static 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
335int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
336{
337 int i, ret;
338
339 if (!vgdev->num_scanouts)
340 return 0;
341
342 ret = drmm_mode_config_init(vgdev->ddev);
343 if (ret)
344 return ret;
345
346 vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
347 vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
348
349 /* modes will be validated against the framebuffer size */
350 vgdev->ddev->mode_config.min_width = XRES_MIN;
351 vgdev->ddev->mode_config.min_height = YRES_MIN;
352 vgdev->ddev->mode_config.max_width = XRES_MAX;
353 vgdev->ddev->mode_config.max_height = YRES_MAX;
354
355 vgdev->ddev->mode_config.fb_modifiers_not_supported = true;
356
357 for (i = 0 ; i < vgdev->num_scanouts; ++i)
358 vgdev_output_init(vgdev, i);
359
360 drm_mode_config_reset(vgdev->ddev);
361 return 0;
362}
363
364void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
365{
366 int i;
367
368 if (!vgdev->num_scanouts)
369 return;
370
371 for (i = 0 ; i < vgdev->num_scanouts; ++i)
372 drm_edid_free(vgdev->outputs[i].drm_edid);
373}