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