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