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 <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_vblank.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
  49 static 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
  59 static 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
  65 static int
  66 virtio_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
  85 static 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 }
  95
  96 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
  97                                           struct drm_crtc_state *old_state)
  98 {
  99         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 100
 101         output->enabled = true;
 102 }
 103
 104 static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
 105                                            struct drm_crtc_state *old_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         output->enabled = false;
 113 }
 114
 115 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 116                                         struct drm_crtc_state *state)
 117 {
 118         return 0;
 119 }
 120
 121 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 122                                          struct drm_crtc_state *old_state)
 123 {
 124         unsigned long flags;
 125
 126         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 127         if (crtc->state->event)
 128                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 129         crtc->state->event = NULL;
 130         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 131 }
 132
 133 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 134         .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 135         .atomic_check  = virtio_gpu_crtc_atomic_check,
 136         .atomic_flush  = virtio_gpu_crtc_atomic_flush,
 137         .atomic_enable = virtio_gpu_crtc_atomic_enable,
 138         .atomic_disable = virtio_gpu_crtc_atomic_disable,
 139 };
 140
 141 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
 142                                     struct drm_display_mode *mode,
 143                                     struct drm_display_mode *adjusted_mode)
 144 {
 145 }
 146
 147 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
 148 {
 149 }
 150
 151 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
 152 {
 153 }
 154
 155 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
 156 {
 157         struct virtio_gpu_output *output =
 158                 drm_connector_to_virtio_gpu_output(connector);
 159         struct drm_display_mode *mode = NULL;
 160         int count, width, height;
 161
 162         if (output->edid) {
 163                 count = drm_add_edid_modes(connector, output->edid);
 164                 if (count)
 165                         return count;
 166         }
 167
 168         width  = le32_to_cpu(output->info.r.width);
 169         height = le32_to_cpu(output->info.r.height);
 170         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 171
 172         if (width == 0 || height == 0) {
 173                 width = XRES_DEF;
 174                 height = YRES_DEF;
 175                 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 176         } else {
 177                 DRM_DEBUG("add mode: %dx%d\n", width, height);
 178                 mode = drm_cvt_mode(connector->dev, width, height, 60,
 179                                     false, false, false);
 180                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 181                 drm_mode_probed_add(connector, mode);
 182                 count++;
 183         }
 184
 185         return count;
 186 }
 187
 188 static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
 189                                       struct drm_display_mode *mode)
 190 {
 191         struct virtio_gpu_output *output =
 192                 drm_connector_to_virtio_gpu_output(connector);
 193         int width, height;
 194
 195         width  = le32_to_cpu(output->info.r.width);
 196         height = le32_to_cpu(output->info.r.height);
 197
 198         if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
 199                 return MODE_OK;
 200         if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
 201                 return MODE_OK;
 202         if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
 203             mode->vdisplay <= height && mode->vdisplay >= height - 16)
 204                 return MODE_OK;
 205
 206         DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
 207         return MODE_BAD;
 208 }
 209
 210 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
 211         .mode_set   = virtio_gpu_enc_mode_set,
 212         .enable     = virtio_gpu_enc_enable,
 213         .disable    = virtio_gpu_enc_disable,
 214 };
 215
 216 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
 217         .get_modes    = virtio_gpu_conn_get_modes,
 218         .mode_valid   = virtio_gpu_conn_mode_valid,
 219 };
 220
 221 static enum drm_connector_status virtio_gpu_conn_detect(
 222                         struct drm_connector *connector,
 223                         bool force)
 224 {
 225         struct virtio_gpu_output *output =
 226                 drm_connector_to_virtio_gpu_output(connector);
 227
 228         if (output->info.enabled)
 229                 return connector_status_connected;
 230         else
 231                 return connector_status_disconnected;
 232 }
 233
 234 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 235 {
 236         drm_connector_unregister(connector);
 237         drm_connector_cleanup(connector);
 238 }
 239
 240 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 241         .detect = virtio_gpu_conn_detect,
 242         .fill_modes = drm_helper_probe_single_connector_modes,
 243         .destroy = virtio_gpu_conn_destroy,
 244         .reset = drm_atomic_helper_connector_reset,
 245         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 246         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 247 };
 248
 249 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
 250         .destroy = drm_encoder_cleanup,
 251 };
 252
 253 static 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_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
 286                          DRM_MODE_ENCODER_VIRTUAL, NULL);
 287         drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
 288         encoder->possible_crtcs = 1 << index;
 289
 290         drm_connector_attach_encoder(connector, encoder);
 291         drm_connector_register(connector);
 292         return 0;
 293 }
 294
 295 static struct drm_framebuffer *
 296 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 297                                    struct drm_file *file_priv,
 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                 return ERR_PTR(-ENOMEM);
 316
 317         ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
 318         if (ret) {
 319                 kfree(virtio_gpu_fb);
 320                 drm_gem_object_put_unlocked(obj);
 321                 return NULL;
 322         }
 323
 324         return &virtio_gpu_fb->base;
 325 }
 326
 327 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
 328 {
 329         struct drm_device *dev = state->dev;
 330
 331         drm_atomic_helper_commit_modeset_disables(dev, state);
 332         drm_atomic_helper_commit_modeset_enables(dev, state);
 333         drm_atomic_helper_commit_planes(dev, state, 0);
 334
 335         drm_atomic_helper_commit_hw_done(state);
 336
 337         drm_atomic_helper_wait_for_vblanks(dev, state);
 338         drm_atomic_helper_cleanup_planes(dev, state);
 339 }
 340
 341 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
 342         .atomic_commit_tail = vgdev_atomic_commit_tail,
 343 };
 344
 345 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
 346         .fb_create = virtio_gpu_user_framebuffer_create,
 347         .atomic_check = drm_atomic_helper_check,
 348         .atomic_commit = drm_atomic_helper_commit,
 349 };
 350
 351 void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 352 {
 353         int i;
 354
 355         drm_mode_config_init(vgdev->ddev);
 356         vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
 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 }
 371
 372 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
 373 {
 374         int i;
 375
 376         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 377                 kfree(vgdev->outputs[i].edid);
 378         drm_atomic_helper_shutdown(vgdev->ddev);
 379         drm_mode_config_cleanup(vgdev->ddev);
 380 }