1 /* $NetBSD: virtgpu_display.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $ */ 2 3 /* 4 * Copyright (C) 2015 Red Hat, Inc. 5 * All Rights Reserved. 6 * 7 * Authors: 8 * Dave Airlie 9 * Alon Levy 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice shall be included in 19 * all copies or substantial portions of the Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 24 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 27 * OTHER DEALINGS IN THE SOFTWARE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: virtgpu_display.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $"); 32 33 #include <drm/drm_atomic_helper.h> 34 #include <drm/drm_damage_helper.h> 35 #include <drm/drm_fourcc.h> 36 #include <drm/drm_gem_framebuffer_helper.h> 37 #include <drm/drm_probe_helper.h> 38 #include <drm/drm_vblank.h> 39 40 #include "virtgpu_drv.h" 41 42 #define XRES_MIN 32 43 #define YRES_MIN 32 44 45 #define XRES_DEF 1024 46 #define YRES_DEF 768 47 48 #define XRES_MAX 8192 49 #define YRES_MAX 8192 50 51 #define drm_connector_to_virtio_gpu_output(x) \ 52 container_of(x, struct virtio_gpu_output, conn) 53 54 static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = { 55 .set_config = drm_atomic_helper_set_config, 56 .destroy = drm_crtc_cleanup, 57 58 .page_flip = drm_atomic_helper_page_flip, 59 .reset = drm_atomic_helper_crtc_reset, 60 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 61 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 62 }; 63 64 static 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 70 static int 71 virtio_gpu_framebuffer_init(struct drm_device *dev, 72 struct virtio_gpu_framebuffer *vgfb, 73 const struct drm_mode_fb_cmd2 *mode_cmd, 74 struct drm_gem_object *obj) 75 { 76 int ret; 77 78 vgfb->base.obj[0] = obj; 79 80 drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd); 81 82 ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs); 83 if (ret) { 84 vgfb->base.obj[0] = NULL; 85 return ret; 86 } 87 return 0; 88 } 89 90 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc) 91 { 92 struct drm_device *dev = crtc->dev; 93 struct virtio_gpu_device *vgdev = dev->dev_private; 94 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc); 95 96 virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 97 crtc->mode.hdisplay, 98 crtc->mode.vdisplay, 0, 0); 99 } 100 101 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc, 102 struct drm_crtc_state *old_state) 103 { 104 struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc); 105 106 output->enabled = true; 107 } 108 109 static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc, 110 struct drm_crtc_state *old_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 virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0); 117 output->enabled = false; 118 } 119 120 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc, 121 struct drm_crtc_state *state) 122 { 123 return 0; 124 } 125 126 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc, 127 struct drm_crtc_state *old_state) 128 { 129 unsigned long flags; 130 131 spin_lock_irqsave(&crtc->dev->event_lock, flags); 132 if (crtc->state->event) 133 drm_crtc_send_vblank_event(crtc, crtc->state->event); 134 crtc->state->event = NULL; 135 spin_unlock_irqrestore(&crtc->dev->event_lock, flags); 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 width = XRES_DEF; 179 height = YRES_DEF; 180 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF); 181 } else { 182 DRM_DEBUG("add mode: %dx%d\n", width, height); 183 mode = drm_cvt_mode(connector->dev, width, height, 60, 184 false, false, false); 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 const struct drm_encoder_funcs virtio_gpu_enc_funcs = { 255 .destroy = drm_encoder_cleanup, 256 }; 257 258 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index) 259 { 260 struct drm_device *dev = vgdev->ddev; 261 struct virtio_gpu_output *output = vgdev->outputs + index; 262 struct drm_connector *connector = &output->conn; 263 struct drm_encoder *encoder = &output->enc; 264 struct drm_crtc *crtc = &output->crtc; 265 struct drm_plane *primary, *cursor; 266 267 output->index = index; 268 if (index == 0) { 269 output->info.enabled = cpu_to_le32(true); 270 output->info.r.width = cpu_to_le32(XRES_DEF); 271 output->info.r.height = cpu_to_le32(YRES_DEF); 272 } 273 274 primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index); 275 if (IS_ERR(primary)) 276 return PTR_ERR(primary); 277 cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index); 278 if (IS_ERR(cursor)) 279 return PTR_ERR(cursor); 280 drm_crtc_init_with_planes(dev, crtc, primary, cursor, 281 &virtio_gpu_crtc_funcs, NULL); 282 drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs); 283 284 drm_connector_init(dev, connector, &virtio_gpu_connector_funcs, 285 DRM_MODE_CONNECTOR_VIRTUAL); 286 drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs); 287 if (vgdev->has_edid) 288 drm_connector_attach_edid_property(connector); 289 290 drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs, 291 DRM_MODE_ENCODER_VIRTUAL, NULL); 292 drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs); 293 encoder->possible_crtcs = 1 << index; 294 295 drm_connector_attach_encoder(connector, encoder); 296 drm_connector_register(connector); 297 return 0; 298 } 299 300 static struct drm_framebuffer * 301 virtio_gpu_user_framebuffer_create(struct drm_device *dev, 302 struct drm_file *file_priv, 303 const struct drm_mode_fb_cmd2 *mode_cmd) 304 { 305 struct drm_gem_object *obj = NULL; 306 struct virtio_gpu_framebuffer *virtio_gpu_fb; 307 int ret; 308 309 if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 && 310 mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888) 311 return ERR_PTR(-ENOENT); 312 313 /* lookup object associated with res handle */ 314 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]); 315 if (!obj) 316 return ERR_PTR(-EINVAL); 317 318 virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL); 319 if (virtio_gpu_fb == NULL) 320 return ERR_PTR(-ENOMEM); 321 322 ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj); 323 if (ret) { 324 kfree(virtio_gpu_fb); 325 drm_gem_object_put_unlocked(obj); 326 return NULL; 327 } 328 329 return &virtio_gpu_fb->base; 330 } 331 332 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state) 333 { 334 struct drm_device *dev = state->dev; 335 336 drm_atomic_helper_commit_modeset_disables(dev, state); 337 drm_atomic_helper_commit_modeset_enables(dev, state); 338 drm_atomic_helper_commit_planes(dev, state, 0); 339 340 drm_atomic_helper_commit_hw_done(state); 341 342 drm_atomic_helper_wait_for_vblanks(dev, state); 343 drm_atomic_helper_cleanup_planes(dev, state); 344 } 345 346 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = { 347 .atomic_commit_tail = vgdev_atomic_commit_tail, 348 }; 349 350 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = { 351 .fb_create = virtio_gpu_user_framebuffer_create, 352 .atomic_check = drm_atomic_helper_check, 353 .atomic_commit = drm_atomic_helper_commit, 354 }; 355 356 void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev) 357 { 358 int i; 359 360 drm_mode_config_init(vgdev->ddev); 361 vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true; 362 vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs; 363 vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers; 364 365 /* modes will be validated against the framebuffer size */ 366 vgdev->ddev->mode_config.min_width = XRES_MIN; 367 vgdev->ddev->mode_config.min_height = YRES_MIN; 368 vgdev->ddev->mode_config.max_width = XRES_MAX; 369 vgdev->ddev->mode_config.max_height = YRES_MAX; 370 371 for (i = 0 ; i < vgdev->num_scanouts; ++i) 372 vgdev_output_init(vgdev, i); 373 374 drm_mode_config_reset(vgdev->ddev); 375 } 376 377 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev) 378 { 379 int i; 380 381 for (i = 0 ; i < vgdev->num_scanouts; ++i) 382 kfree(vgdev->outputs[i].edid); 383 drm_atomic_helper_shutdown(vgdev->ddev); 384 drm_mode_config_cleanup(vgdev->ddev); 385 } 386
Indexes created Sun Sep 21 16:09:51 GMT 2025