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_atomic_helper.h>
  30 #include <drm/drm_gem_framebuffer_helper.h>
  31 #include <drm/drm_probe_helper.h>
  32 #include <drm/drm_damage_helper.h>
  33
  34 #define XRES_MIN    32
  35 #define YRES_MIN    32
  36
  37 #define XRES_DEF  1024
  38 #define YRES_DEF   768
  39
  40 #define XRES_MAX  8192
  41 #define YRES_MAX  8192
  42
  43 static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
  44         .set_config             = drm_atomic_helper_set_config,
  45         .destroy                = drm_crtc_cleanup,
  46
  47         .page_flip              = drm_atomic_helper_page_flip,
  48         .reset                  = drm_atomic_helper_crtc_reset,
  49         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
  50         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
  51 };
  52
  53 static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
  54         .create_handle = drm_gem_fb_create_handle,
  55         .destroy = drm_gem_fb_destroy,
  56         .dirty = drm_atomic_helper_dirtyfb,
  57 };
  58
  59 int
  60 virtio_gpu_framebuffer_init(struct drm_device *dev,
  61                             struct virtio_gpu_framebuffer *vgfb,
  62                             const struct drm_mode_fb_cmd2 *mode_cmd,
  63                             struct drm_gem_object *obj)
  64 {
  65         int ret;
  66
  67         vgfb->base.obj[0] = obj;
  68
  69         drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
  70
  71         ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
  72         if (ret) {
  73                 vgfb->base.obj[0] = NULL;
  74                 return ret;
  75         }
  76         return 0;
  77 }
  78
  79 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
  80 {
  81         struct drm_device *dev = crtc->dev;
  82         struct virtio_gpu_device *vgdev = dev->dev_private;
  83         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
  84
  85         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
  86                                    crtc->mode.hdisplay,
  87                                    crtc->mode.vdisplay, 0, 0);
  88 }
  89
  90 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
  91                                           struct drm_crtc_state *old_state)
  92 {
  93         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
  94
  95         output->enabled = true;
  96 }
  97
  98 static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
  99                                            struct drm_crtc_state *old_state)
 100 {
 101         struct drm_device *dev = crtc->dev;
 102         struct virtio_gpu_device *vgdev = dev->dev_private;
 103         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 104
 105         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
 106         output->enabled = false;
 107 }
 108
 109 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 110                                         struct drm_crtc_state *state)
 111 {
 112         return 0;
 113 }
 114
 115 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 116                                          struct drm_crtc_state *old_state)
 117 {
 118         unsigned long flags;
 119
 120         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 121         if (crtc->state->event)
 122                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 123         crtc->state->event = NULL;
 124         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 125 }
 126
 127 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 128         .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 129         .atomic_check  = virtio_gpu_crtc_atomic_check,
 130         .atomic_flush  = virtio_gpu_crtc_atomic_flush,
 131         .atomic_enable = virtio_gpu_crtc_atomic_enable,
 132         .atomic_disable = virtio_gpu_crtc_atomic_disable,
 133 };
 134
 135 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
 136                                     struct drm_display_mode *mode,
 137                                     struct drm_display_mode *adjusted_mode)
 138 {
 139 }
 140
 141 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
 142 {
 143 }
 144
 145 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
 146 {
 147 }
 148
 149 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
 150 {
 151         struct virtio_gpu_output *output =
 152                 drm_connector_to_virtio_gpu_output(connector);
 153         struct drm_display_mode *mode = NULL;
 154         int count, width, height;
 155
 156         if (output->edid) {
 157                 count = drm_add_edid_modes(connector, output->edid);
 158                 if (count)
 159                         return count;
 160         }
 161
 162         width  = le32_to_cpu(output->info.r.width);
 163         height = le32_to_cpu(output->info.r.height);
 164         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 165
 166         if (width == 0 || height == 0) {
 167                 width = XRES_DEF;
 168                 height = YRES_DEF;
 169                 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 170         } else {
 171                 DRM_DEBUG("add mode: %dx%d\n", width, height);
 172                 mode = drm_cvt_mode(connector->dev, width, height, 60,
 173                                     false, false, false);
 174                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 175                 drm_mode_probed_add(connector, mode);
 176                 count++;
 177         }
 178
 179         return count;
 180 }
 181
 182 static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
 183                                       struct drm_display_mode *mode)
 184 {
 185         struct virtio_gpu_output *output =
 186                 drm_connector_to_virtio_gpu_output(connector);
 187         int width, height;
 188
 189         width  = le32_to_cpu(output->info.r.width);
 190         height = le32_to_cpu(output->info.r.height);
 191
 192         if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
 193                 return MODE_OK;
 194         if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
 195                 return MODE_OK;
 196         if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
 197             mode->vdisplay <= height && mode->vdisplay >= height - 16)
 198                 return MODE_OK;
 199
 200         DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
 201         return MODE_BAD;
 202 }
 203
 204 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
 205         .mode_set   = virtio_gpu_enc_mode_set,
 206         .enable     = virtio_gpu_enc_enable,
 207         .disable    = virtio_gpu_enc_disable,
 208 };
 209
 210 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
 211         .get_modes    = virtio_gpu_conn_get_modes,
 212         .mode_valid   = virtio_gpu_conn_mode_valid,
 213 };
 214
 215 static enum drm_connector_status virtio_gpu_conn_detect(
 216                         struct drm_connector *connector,
 217                         bool force)
 218 {
 219         struct virtio_gpu_output *output =
 220                 drm_connector_to_virtio_gpu_output(connector);
 221
 222         if (output->info.enabled)
 223                 return connector_status_connected;
 224         else
 225                 return connector_status_disconnected;
 226 }
 227
 228 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 229 {
 230         drm_connector_unregister(connector);
 231         drm_connector_cleanup(connector);
 232 }
 233
 234 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 235         .detect = virtio_gpu_conn_detect,
 236         .fill_modes = drm_helper_probe_single_connector_modes,
 237         .destroy = virtio_gpu_conn_destroy,
 238         .reset = drm_atomic_helper_connector_reset,
 239         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 240         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 241 };
 242
 243 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
 244         .destroy = drm_encoder_cleanup,
 245 };
 246
 247 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 248 {
 249         struct drm_device *dev = vgdev->ddev;
 250         struct virtio_gpu_output *output = vgdev->outputs + index;
 251         struct drm_connector *connector = &output->conn;
 252         struct drm_encoder *encoder = &output->enc;
 253         struct drm_crtc *crtc = &output->crtc;
 254         struct drm_plane *primary, *cursor;
 255
 256         output->index = index;
 257         if (index == 0) {
 258                 output->info.enabled = cpu_to_le32(true);
 259                 output->info.r.width = cpu_to_le32(XRES_DEF);
 260                 output->info.r.height = cpu_to_le32(YRES_DEF);
 261         }
 262
 263         primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
 264         if (IS_ERR(primary))
 265                 return PTR_ERR(primary);
 266         cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
 267         if (IS_ERR(cursor))
 268                 return PTR_ERR(cursor);
 269         drm_crtc_init_with_planes(dev, crtc, primary, cursor,
 270                                   &virtio_gpu_crtc_funcs, NULL);
 271         drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 272
 273         drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
 274                            DRM_MODE_CONNECTOR_VIRTUAL);
 275         drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
 276         if (vgdev->has_edid)
 277                 drm_connector_attach_edid_property(connector);
 278
 279         drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
 280                          DRM_MODE_ENCODER_VIRTUAL, NULL);
 281         drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
 282         encoder->possible_crtcs = 1 << index;
 283
 284         drm_connector_attach_encoder(connector, encoder);
 285         drm_connector_register(connector);
 286         return 0;
 287 }
 288
 289 static struct drm_framebuffer *
 290 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 291                                    struct drm_file *file_priv,
 292                                    const struct drm_mode_fb_cmd2 *mode_cmd)
 293 {
 294         struct drm_gem_object *obj = NULL;
 295         struct virtio_gpu_framebuffer *virtio_gpu_fb;
 296         int ret;
 297
 298         if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
 299             mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
 300                 return ERR_PTR(-ENOENT);
 301
 302         /* lookup object associated with res handle */
 303         obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
 304         if (!obj)
 305                 return ERR_PTR(-EINVAL);
 306
 307         virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
 308         if (virtio_gpu_fb == NULL)
 309                 return ERR_PTR(-ENOMEM);
 310
 311         ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
 312         if (ret) {
 313                 kfree(virtio_gpu_fb);
 314                 drm_gem_object_put_unlocked(obj);
 315                 return NULL;
 316         }
 317
 318         return &virtio_gpu_fb->base;
 319 }
 320
 321 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
 322 {
 323         struct drm_device *dev = state->dev;
 324
 325         drm_atomic_helper_commit_modeset_disables(dev, state);
 326         drm_atomic_helper_commit_modeset_enables(dev, state);
 327         drm_atomic_helper_commit_planes(dev, state, 0);
 328
 329         drm_atomic_helper_commit_hw_done(state);
 330
 331         drm_atomic_helper_wait_for_vblanks(dev, state);
 332         drm_atomic_helper_cleanup_planes(dev, state);
 333 }
 334
 335 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
 336         .atomic_commit_tail = vgdev_atomic_commit_tail,
 337 };
 338
 339 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
 340         .fb_create = virtio_gpu_user_framebuffer_create,
 341         .atomic_check = drm_atomic_helper_check,
 342         .atomic_commit = drm_atomic_helper_commit,
 343 };
 344
 345 void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 346 {
 347         int i;
 348
 349         drm_mode_config_init(vgdev->ddev);
 350         vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
 351         vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
 352         vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
 353
 354         /* modes will be validated against the framebuffer size */
 355         vgdev->ddev->mode_config.min_width = XRES_MIN;
 356         vgdev->ddev->mode_config.min_height = YRES_MIN;
 357         vgdev->ddev->mode_config.max_width = XRES_MAX;
 358         vgdev->ddev->mode_config.max_height = YRES_MAX;
 359
 360         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 361                 vgdev_output_init(vgdev, i);
 362
 363         drm_mode_config_reset(vgdev->ddev);
 364 }
 365
 366 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
 367 {
 368         int i;
 369
 370         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 371                 kfree(vgdev->outputs[i].edid);
 372         drm_atomic_helper_shutdown(vgdev->ddev);
 373         drm_mode_config_cleanup(vgdev->ddev);
 374 }