drivers/gpu/drm/virtio/virtgpu_display.c

   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 "virtgpu_drv.h"
  29 #include <drm/drm_crtc_helper.h>
  30 #include <drm/drm_atomic_helper.h>
  31
  32 #define XRES_MIN    32
  33 #define YRES_MIN    32
  34
  35 #define XRES_DEF  1024
  36 #define YRES_DEF   768
  37
  38 #define XRES_MAX  8192
  39 #define YRES_MAX  8192
  40
  41 static int virtio_gpu_page_flip(struct drm_crtc *crtc,
  42                                 struct drm_framebuffer *fb,
  43                                 struct drm_pending_vblank_event *event,
  44                                 uint32_t flags)
  45 {
  46         struct virtio_gpu_device *vgdev = crtc->dev->dev_private;
  47         struct virtio_gpu_output *output =
  48                 container_of(crtc, struct virtio_gpu_output, crtc);
  49         struct drm_plane *plane = crtc->primary;
  50         struct virtio_gpu_framebuffer *vgfb;
  51         struct virtio_gpu_object *bo;
  52         unsigned long irqflags;
  53         uint32_t handle;
  54
  55         plane->fb = fb;
  56         vgfb = to_virtio_gpu_framebuffer(plane->fb);
  57         bo = gem_to_virtio_gpu_obj(vgfb->obj);
  58         handle = bo->hw_res_handle;
  59
  60         DRM_DEBUG("handle 0x%x%s, crtc %dx%d\n", handle,
  61                   bo->dumb ? ", dumb" : "",
  62                   crtc->mode.hdisplay, crtc->mode.vdisplay);
  63         if (bo->dumb) {
  64                 virtio_gpu_cmd_transfer_to_host_2d
  65                         (vgdev, handle, 0,
  66                          cpu_to_le32(crtc->mode.hdisplay),
  67                          cpu_to_le32(crtc->mode.vdisplay),
  68                          0, 0, NULL);
  69         }
  70         virtio_gpu_cmd_set_scanout(vgdev, output->index, handle,
  71                                    crtc->mode.hdisplay,
  72                                    crtc->mode.vdisplay, 0, 0);
  73         virtio_gpu_cmd_resource_flush(vgdev, handle, 0, 0,
  74                                       crtc->mode.hdisplay,
  75                                       crtc->mode.vdisplay);
  76
  77         if (event) {
  78                 spin_lock_irqsave(&crtc->dev->event_lock, irqflags);
  79                 drm_crtc_send_vblank_event(crtc, event);
  80                 spin_unlock_irqrestore(&crtc->dev->event_lock, irqflags);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
  87         .set_config             = drm_atomic_helper_set_config,
  88         .destroy                = drm_crtc_cleanup,
  89
  90         .page_flip              = virtio_gpu_page_flip,
  91         .reset                  = drm_atomic_helper_crtc_reset,
  92         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
  93         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
  94 };
  95
  96 static void virtio_gpu_user_framebuffer_destroy(struct drm_framebuffer *fb)
  97 {
  98         struct virtio_gpu_framebuffer *virtio_gpu_fb
  99                 = to_virtio_gpu_framebuffer(fb);
 100
 101         if (virtio_gpu_fb->obj)
 102                 drm_gem_object_unreference_unlocked(virtio_gpu_fb->obj);
 103         drm_framebuffer_cleanup(fb);
 104         kfree(virtio_gpu_fb);
 105 }
 106
 107 static int
 108 virtio_gpu_framebuffer_surface_dirty(struct drm_framebuffer *fb,
 109                                      struct drm_file *file_priv,
 110                                      unsigned flags, unsigned color,
 111                                      struct drm_clip_rect *clips,
 112                                      unsigned num_clips)
 113 {
 114         struct virtio_gpu_framebuffer *virtio_gpu_fb
 115                 = to_virtio_gpu_framebuffer(fb);
 116
 117         return virtio_gpu_surface_dirty(virtio_gpu_fb, clips, num_clips);
 118 }
 119
 120 static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
 121         .destroy = virtio_gpu_user_framebuffer_destroy,
 122         .dirty = virtio_gpu_framebuffer_surface_dirty,
 123 };
 124
 125 int
 126 virtio_gpu_framebuffer_init(struct drm_device *dev,
 127                             struct virtio_gpu_framebuffer *vgfb,
 128                             const struct drm_mode_fb_cmd2 *mode_cmd,
 129                             struct drm_gem_object *obj)
 130 {
 131         int ret;
 132         struct virtio_gpu_object *bo;
 133         vgfb->obj = obj;
 134
 135         bo = gem_to_virtio_gpu_obj(obj);
 136
 137         ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
 138         if (ret) {
 139                 vgfb->obj = NULL;
 140                 return ret;
 141         }
 142         drm_helper_mode_fill_fb_struct(&vgfb->base, mode_cmd);
 143
 144         spin_lock_init(&vgfb->dirty_lock);
 145         vgfb->x1 = vgfb->y1 = INT_MAX;
 146         vgfb->x2 = vgfb->y2 = 0;
 147         return 0;
 148 }
 149
 150 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 151 {
 152         struct drm_device *dev = crtc->dev;
 153         struct virtio_gpu_device *vgdev = dev->dev_private;
 154         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 155
 156         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 157                                    crtc->mode.hdisplay,
 158                                    crtc->mode.vdisplay, 0, 0);
 159 }
 160
 161 static void virtio_gpu_crtc_enable(struct drm_crtc *crtc)
 162 {
 163 }
 164
 165 static void virtio_gpu_crtc_disable(struct drm_crtc *crtc)
 166 {
 167         struct drm_device *dev = crtc->dev;
 168         struct virtio_gpu_device *vgdev = dev->dev_private;
 169         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 170
 171         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
 172 }
 173
 174 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 175                                         struct drm_crtc_state *state)
 176 {
 177         return 0;
 178 }
 179
 180 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 181                                          struct drm_crtc_state *old_state)
 182 {
 183         unsigned long flags;
 184
 185         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 186         if (crtc->state->event)
 187                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 188         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 189 }
 190
 191 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 192         .enable        = virtio_gpu_crtc_enable,
 193         .disable       = virtio_gpu_crtc_disable,
 194         .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 195         .atomic_check  = virtio_gpu_crtc_atomic_check,
 196         .atomic_flush  = virtio_gpu_crtc_atomic_flush,
 197 };
 198
 199 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
 200                                     struct drm_display_mode *mode,
 201                                     struct drm_display_mode *adjusted_mode)
 202 {
 203 }
 204
 205 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
 206 {
 207 }
 208
 209 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
 210 {
 211 }
 212
 213 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
 214 {
 215         struct virtio_gpu_output *output =
 216                 drm_connector_to_virtio_gpu_output(connector);
 217         struct drm_display_mode *mode = NULL;
 218         int count, width, height;
 219
 220         width  = le32_to_cpu(output->info.r.width);
 221         height = le32_to_cpu(output->info.r.height);
 222         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 223
 224         if (width == 0 || height == 0) {
 225                 width = XRES_DEF;
 226                 height = YRES_DEF;
 227                 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 228         } else {
 229                 DRM_DEBUG("add mode: %dx%d\n", width, height);
 230                 mode = drm_cvt_mode(connector->dev, width, height, 60,
 231                                     false, false, false);
 232                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 233                 drm_mode_probed_add(connector, mode);
 234                 count++;
 235         }
 236
 237         return count;
 238 }
 239
 240 static int virtio_gpu_conn_mode_valid(struct drm_connector *connector,
 241                                       struct drm_display_mode *mode)
 242 {
 243         struct virtio_gpu_output *output =
 244                 drm_connector_to_virtio_gpu_output(connector);
 245         int width, height;
 246
 247         width  = le32_to_cpu(output->info.r.width);
 248         height = le32_to_cpu(output->info.r.height);
 249
 250         if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
 251                 return MODE_OK;
 252         if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
 253                 return MODE_OK;
 254         if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
 255             mode->vdisplay <= height && mode->vdisplay >= height - 16)
 256                 return MODE_OK;
 257
 258         DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
 259         return MODE_BAD;
 260 }
 261
 262 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
 263         .mode_set   = virtio_gpu_enc_mode_set,
 264         .enable     = virtio_gpu_enc_enable,
 265         .disable    = virtio_gpu_enc_disable,
 266 };
 267
 268 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
 269         .get_modes    = virtio_gpu_conn_get_modes,
 270         .mode_valid   = virtio_gpu_conn_mode_valid,
 271 };
 272
 273 static enum drm_connector_status virtio_gpu_conn_detect(
 274                         struct drm_connector *connector,
 275                         bool force)
 276 {
 277         struct virtio_gpu_output *output =
 278                 drm_connector_to_virtio_gpu_output(connector);
 279
 280         if (output->info.enabled)
 281                 return connector_status_connected;
 282         else
 283                 return connector_status_disconnected;
 284 }
 285
 286 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 287 {
 288         struct virtio_gpu_output *virtio_gpu_output =
 289                 drm_connector_to_virtio_gpu_output(connector);
 290
 291         drm_connector_unregister(connector);
 292         drm_connector_cleanup(connector);
 293         kfree(virtio_gpu_output);
 294 }
 295
 296 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 297         .dpms = drm_atomic_helper_connector_dpms,
 298         .detect = virtio_gpu_conn_detect,
 299         .fill_modes = drm_helper_probe_single_connector_modes,
 300         .destroy = virtio_gpu_conn_destroy,
 301         .reset = drm_atomic_helper_connector_reset,
 302         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 303         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 304 };
 305
 306 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
 307         .destroy = drm_encoder_cleanup,
 308 };
 309
 310 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 311 {
 312         struct drm_device *dev = vgdev->ddev;
 313         struct virtio_gpu_output *output = vgdev->outputs + index;
 314         struct drm_connector *connector = &output->conn;
 315         struct drm_encoder *encoder = &output->enc;
 316         struct drm_crtc *crtc = &output->crtc;
 317         struct drm_plane *primary, *cursor;
 318
 319         output->index = index;
 320         if (index == 0) {
 321                 output->info.enabled = cpu_to_le32(true);
 322                 output->info.r.width = cpu_to_le32(XRES_DEF);
 323                 output->info.r.height = cpu_to_le32(YRES_DEF);
 324         }
 325
 326         primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
 327         if (IS_ERR(primary))
 328                 return PTR_ERR(primary);
 329         cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
 330         if (IS_ERR(cursor))
 331                 return PTR_ERR(cursor);
 332         drm_crtc_init_with_planes(dev, crtc, primary, cursor,
 333                                   &virtio_gpu_crtc_funcs, NULL);
 334         drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 335         primary->crtc = crtc;
 336         cursor->crtc = crtc;
 337
 338         drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
 339                            DRM_MODE_CONNECTOR_VIRTUAL);
 340         drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
 341
 342         drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
 343                          DRM_MODE_ENCODER_VIRTUAL, NULL);
 344         drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
 345         encoder->possible_crtcs = 1 << index;
 346
 347         drm_mode_connector_attach_encoder(connector, encoder);
 348         drm_connector_register(connector);
 349         return 0;
 350 }
 351
 352 static struct drm_framebuffer *
 353 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 354                                    struct drm_file *file_priv,
 355                                    const struct drm_mode_fb_cmd2 *mode_cmd)
 356 {
 357         struct drm_gem_object *obj = NULL;
 358         struct virtio_gpu_framebuffer *virtio_gpu_fb;
 359         int ret;
 360
 361         /* lookup object associated with res handle */
 362         obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
 363         if (!obj)
 364                 return ERR_PTR(-EINVAL);
 365
 366         virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
 367         if (virtio_gpu_fb == NULL)
 368                 return ERR_PTR(-ENOMEM);
 369
 370         ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
 371         if (ret) {
 372                 kfree(virtio_gpu_fb);
 373                 if (obj)
 374                         drm_gem_object_unreference_unlocked(obj);
 375                 return NULL;
 376         }
 377
 378         return &virtio_gpu_fb->base;
 379 }
 380
 381 static int vgdev_atomic_commit(struct drm_device *dev,
 382                                struct drm_atomic_state *state,
 383                                bool nonblock)
 384 {
 385         if (nonblock)
 386                 return -EBUSY;
 387
 388         drm_atomic_helper_swap_state(state, true);
 389         drm_atomic_helper_wait_for_fences(dev, state);
 390
 391         drm_atomic_helper_commit_modeset_disables(dev, state);
 392         drm_atomic_helper_commit_modeset_enables(dev, state);
 393         drm_atomic_helper_commit_planes(dev, state, true);
 394
 395         drm_atomic_helper_wait_for_vblanks(dev, state);
 396         drm_atomic_helper_cleanup_planes(dev, state);
 397         drm_atomic_state_free(state);
 398         return 0;
 399 }
 400
 401 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
 402         .fb_create = virtio_gpu_user_framebuffer_create,
 403         .atomic_check = drm_atomic_helper_check,
 404         .atomic_commit = vgdev_atomic_commit,
 405 };
 406
 407 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 408 {
 409         int i;
 410
 411         drm_mode_config_init(vgdev->ddev);
 412         vgdev->ddev->mode_config.funcs = (void *)&virtio_gpu_mode_funcs;
 413
 414         /* modes will be validated against the framebuffer size */
 415         vgdev->ddev->mode_config.min_width = XRES_MIN;
 416         vgdev->ddev->mode_config.min_height = YRES_MIN;
 417         vgdev->ddev->mode_config.max_width = XRES_MAX;
 418         vgdev->ddev->mode_config.max_height = YRES_MAX;
 419
 420         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 421                 vgdev_output_init(vgdev, i);
 422
 423         drm_mode_config_reset(vgdev->ddev);
 424         return 0;
 425 }
 426
 427 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
 428 {
 429         virtio_gpu_fbdev_fini(vgdev);
 430         drm_mode_config_cleanup(vgdev->ddev);
 431 }