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
  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
  79         vgfb->base.obj[0] = obj;
  80
  81         drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
  82
  83         ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
  84         if (ret) {
  85                 vgfb->base.obj[0] = NULL;
  86                 return ret;
  87         }
  88
  89         spin_lock_init(&vgfb->dirty_lock);
  90         vgfb->x1 = vgfb->y1 = INT_MAX;
  91         vgfb->x2 = vgfb->y2 = 0;
  92         return 0;
  93 }
  94
  95 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
  96 {
  97         struct drm_device *dev = crtc->dev;
  98         struct virtio_gpu_device *vgdev = dev->dev_private;
  99         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 100
 101         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 102                                    crtc->mode.hdisplay,
 103                                    crtc->mode.vdisplay, 0, 0);
 104 }
 105
 106 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
 107                                           struct drm_crtc_state *old_state)
 108 {
 109         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 110
 111         output->enabled = true;
 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         output->enabled = false;
 123 }
 124
 125 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 126                                         struct drm_crtc_state *state)
 127 {
 128         return 0;
 129 }
 130
 131 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 132                                          struct drm_crtc_state *old_state)
 133 {
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 137         if (crtc->state->event)
 138                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 139         crtc->state->event = NULL;
 140         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 141 }
 142
 143 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 144         .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 145         .atomic_check  = virtio_gpu_crtc_atomic_check,
 146         .atomic_flush  = virtio_gpu_crtc_atomic_flush,
 147         .atomic_enable = virtio_gpu_crtc_atomic_enable,
 148         .atomic_disable = virtio_gpu_crtc_atomic_disable,
 149 };
 150
 151 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
 152                                     struct drm_display_mode *mode,
 153                                     struct drm_display_mode *adjusted_mode)
 154 {
 155 }
 156
 157 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
 158 {
 159 }
 160
 161 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
 162 {
 163 }
 164
 165 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
 166 {
 167         struct virtio_gpu_output *output =
 168                 drm_connector_to_virtio_gpu_output(connector);
 169         struct drm_display_mode *mode = NULL;
 170         int count, width, height;
 171
 172         if (output->edid) {
 173                 count = drm_add_edid_modes(connector, output->edid);
 174                 if (count)
 175                         return count;
 176         }
 177
 178         width  = le32_to_cpu(output->info.r.width);
 179         height = le32_to_cpu(output->info.r.height);
 180         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 181
 182         if (width == 0 || height == 0) {
 183                 width = XRES_DEF;
 184                 height = YRES_DEF;
 185                 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 186         } else {
 187                 DRM_DEBUG("add mode: %dx%d\n", width, height);
 188                 mode = drm_cvt_mode(connector->dev, width, height, 60,
 189                                     false, false, false);
 190                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 191                 drm_mode_probed_add(connector, mode);
 192                 count++;
 193         }
 194
 195         return count;
 196 }
 197
 198 static enum drm_mode_status virtio_gpu_conn_mode_valid(struct drm_connector *connector,
 199                                       struct drm_display_mode *mode)
 200 {
 201         struct virtio_gpu_output *output =
 202                 drm_connector_to_virtio_gpu_output(connector);
 203         int width, height;
 204
 205         width  = le32_to_cpu(output->info.r.width);
 206         height = le32_to_cpu(output->info.r.height);
 207
 208         if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
 209                 return MODE_OK;
 210         if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
 211                 return MODE_OK;
 212         if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
 213             mode->vdisplay <= height && mode->vdisplay >= height - 16)
 214                 return MODE_OK;
 215
 216         DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
 217         return MODE_BAD;
 218 }
 219
 220 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
 221         .mode_set   = virtio_gpu_enc_mode_set,
 222         .enable     = virtio_gpu_enc_enable,
 223         .disable    = virtio_gpu_enc_disable,
 224 };
 225
 226 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
 227         .get_modes    = virtio_gpu_conn_get_modes,
 228         .mode_valid   = virtio_gpu_conn_mode_valid,
 229 };
 230
 231 static enum drm_connector_status virtio_gpu_conn_detect(
 232                         struct drm_connector *connector,
 233                         bool force)
 234 {
 235         struct virtio_gpu_output *output =
 236                 drm_connector_to_virtio_gpu_output(connector);
 237
 238         if (output->info.enabled)
 239                 return connector_status_connected;
 240         else
 241                 return connector_status_disconnected;
 242 }
 243
 244 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 245 {
 246         drm_connector_unregister(connector);
 247         drm_connector_cleanup(connector);
 248 }
 249
 250 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 251         .detect = virtio_gpu_conn_detect,
 252         .fill_modes = drm_helper_probe_single_connector_modes,
 253         .destroy = virtio_gpu_conn_destroy,
 254         .reset = drm_atomic_helper_connector_reset,
 255         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 256         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 257 };
 258
 259 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
 260         .destroy = drm_encoder_cleanup,
 261 };
 262
 263 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 264 {
 265         struct drm_device *dev = vgdev->ddev;
 266         struct virtio_gpu_output *output = vgdev->outputs + index;
 267         struct drm_connector *connector = &output->conn;
 268         struct drm_encoder *encoder = &output->enc;
 269         struct drm_crtc *crtc = &output->crtc;
 270         struct drm_plane *primary, *cursor;
 271
 272         output->index = index;
 273         if (index == 0) {
 274                 output->info.enabled = cpu_to_le32(true);
 275                 output->info.r.width = cpu_to_le32(XRES_DEF);
 276                 output->info.r.height = cpu_to_le32(YRES_DEF);
 277         }
 278
 279         primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
 280         if (IS_ERR(primary))
 281                 return PTR_ERR(primary);
 282         cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
 283         if (IS_ERR(cursor))
 284                 return PTR_ERR(cursor);
 285         drm_crtc_init_with_planes(dev, crtc, primary, cursor,
 286                                   &virtio_gpu_crtc_funcs, NULL);
 287         drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 288
 289         drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
 290                            DRM_MODE_CONNECTOR_VIRTUAL);
 291         drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
 292         if (vgdev->has_edid)
 293                 drm_connector_attach_edid_property(connector);
 294
 295         drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
 296                          DRM_MODE_ENCODER_VIRTUAL, NULL);
 297         drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
 298         encoder->possible_crtcs = 1 << index;
 299
 300         drm_connector_attach_encoder(connector, encoder);
 301         drm_connector_register(connector);
 302         return 0;
 303 }
 304
 305 static struct drm_framebuffer *
 306 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 307                                    struct drm_file *file_priv,
 308                                    const struct drm_mode_fb_cmd2 *mode_cmd)
 309 {
 310         struct drm_gem_object *obj = NULL;
 311         struct virtio_gpu_framebuffer *virtio_gpu_fb;
 312         int ret;
 313
 314         if (mode_cmd->pixel_format != DRM_FORMAT_HOST_XRGB8888 &&
 315             mode_cmd->pixel_format != DRM_FORMAT_HOST_ARGB8888)
 316                 return ERR_PTR(-ENOENT);
 317
 318         /* lookup object associated with res handle */
 319         obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
 320         if (!obj)
 321                 return ERR_PTR(-EINVAL);
 322
 323         virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
 324         if (virtio_gpu_fb == NULL)
 325                 return ERR_PTR(-ENOMEM);
 326
 327         ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
 328         if (ret) {
 329                 kfree(virtio_gpu_fb);
 330                 drm_gem_object_put_unlocked(obj);
 331                 return NULL;
 332         }
 333
 334         return &virtio_gpu_fb->base;
 335 }
 336
 337 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
 338 {
 339         struct drm_device *dev = state->dev;
 340
 341         drm_atomic_helper_commit_modeset_disables(dev, state);
 342         drm_atomic_helper_commit_modeset_enables(dev, state);
 343         drm_atomic_helper_commit_planes(dev, state, 0);
 344
 345         drm_atomic_helper_commit_hw_done(state);
 346
 347         drm_atomic_helper_wait_for_vblanks(dev, state);
 348         drm_atomic_helper_cleanup_planes(dev, state);
 349 }
 350
 351 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
 352         .atomic_commit_tail = vgdev_atomic_commit_tail,
 353 };
 354
 355 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
 356         .fb_create = virtio_gpu_user_framebuffer_create,
 357         .atomic_check = drm_atomic_helper_check,
 358         .atomic_commit = drm_atomic_helper_commit,
 359 };
 360
 361 void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 362 {
 363         int i;
 364
 365         drm_mode_config_init(vgdev->ddev);
 366         vgdev->ddev->mode_config.quirk_addfb_prefer_host_byte_order = true;
 367         vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
 368         vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
 369
 370         /* modes will be validated against the framebuffer size */
 371         vgdev->ddev->mode_config.min_width = XRES_MIN;
 372         vgdev->ddev->mode_config.min_height = YRES_MIN;
 373         vgdev->ddev->mode_config.max_width = XRES_MAX;
 374         vgdev->ddev->mode_config.max_height = YRES_MAX;
 375
 376         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 377                 vgdev_output_init(vgdev, i);
 378
 379         drm_mode_config_reset(vgdev->ddev);
 380 }
 381
 382 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
 383 {
 384         int i;
 385
 386         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 387                 kfree(vgdev->outputs[i].edid);
 388         drm_mode_config_cleanup(vgdev->ddev);
 389 }