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
  32 #define XRES_MIN    32
  33 #define YRES_MIN    32
  34
  35 #define XRES_DEF  1024
  36 #define YRES_DEF   768
  37
  38 #define XRES_MAX  8192
  39 #define YRES_MAX  8192
  40
  41 static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
  42         .set_config             = drm_atomic_helper_set_config,
  43         .destroy                = drm_crtc_cleanup,
  44
  45         .page_flip              = drm_atomic_helper_page_flip,
  46         .reset                  = drm_atomic_helper_crtc_reset,
  47         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
  48         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
  49 };
  50
  51 static void virtio_gpu_user_framebuffer_destroy(struct drm_framebuffer *fb)
  52 {
  53         struct virtio_gpu_framebuffer *virtio_gpu_fb
  54                 = to_virtio_gpu_framebuffer(fb);
  55
  56         drm_gem_object_unreference_unlocked(virtio_gpu_fb->obj);
  57         drm_framebuffer_cleanup(fb);
  58         kfree(virtio_gpu_fb);
  59 }
  60
  61 static int
  62 virtio_gpu_framebuffer_surface_dirty(struct drm_framebuffer *fb,
  63                                      struct drm_file *file_priv,
  64                                      unsigned flags, unsigned color,
  65                                      struct drm_clip_rect *clips,
  66                                      unsigned num_clips)
  67 {
  68         struct virtio_gpu_framebuffer *virtio_gpu_fb
  69                 = to_virtio_gpu_framebuffer(fb);
  70
  71         return virtio_gpu_surface_dirty(virtio_gpu_fb, clips, num_clips);
  72 }
  73
  74 static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
  75         .destroy = virtio_gpu_user_framebuffer_destroy,
  76         .dirty = virtio_gpu_framebuffer_surface_dirty,
  77 };
  78
  79 int
  80 virtio_gpu_framebuffer_init(struct drm_device *dev,
  81                             struct virtio_gpu_framebuffer *vgfb,
  82                             const struct drm_mode_fb_cmd2 *mode_cmd,
  83                             struct drm_gem_object *obj)
  84 {
  85         int ret;
  86         struct virtio_gpu_object *bo;
  87         vgfb->obj = obj;
  88
  89         bo = gem_to_virtio_gpu_obj(obj);
  90
  91         ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
  92         if (ret) {
  93                 vgfb->obj = NULL;
  94                 return ret;
  95         }
  96         drm_helper_mode_fill_fb_struct(&vgfb->base, mode_cmd);
  97
  98         spin_lock_init(&vgfb->dirty_lock);
  99         vgfb->x1 = vgfb->y1 = INT_MAX;
 100         vgfb->x2 = vgfb->y2 = 0;
 101         return 0;
 102 }
 103
 104 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 105 {
 106         struct drm_device *dev = crtc->dev;
 107         struct virtio_gpu_device *vgdev = dev->dev_private;
 108         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 109
 110         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 111                                    crtc->mode.hdisplay,
 112                                    crtc->mode.vdisplay, 0, 0);
 113 }
 114
 115 static void virtio_gpu_crtc_enable(struct drm_crtc *crtc)
 116 {
 117 }
 118
 119 static void virtio_gpu_crtc_disable(struct drm_crtc *crtc)
 120 {
 121         struct drm_device *dev = crtc->dev;
 122         struct virtio_gpu_device *vgdev = dev->dev_private;
 123         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 124
 125         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
 126 }
 127
 128 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 129                                         struct drm_crtc_state *state)
 130 {
 131         return 0;
 132 }
 133
 134 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 135                                          struct drm_crtc_state *old_state)
 136 {
 137         unsigned long flags;
 138
 139         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 140         if (crtc->state->event)
 141                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 142         crtc->state->event = NULL;
 143         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 144 }
 145
 146 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 147         .enable        = virtio_gpu_crtc_enable,
 148         .disable       = virtio_gpu_crtc_disable,
 149         .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 150         .atomic_check  = virtio_gpu_crtc_atomic_check,
 151         .atomic_flush  = virtio_gpu_crtc_atomic_flush,
 152 };
 153
 154 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
 155                                     struct drm_display_mode *mode,
 156                                     struct drm_display_mode *adjusted_mode)
 157 {
 158 }
 159
 160 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
 161 {
 162 }
 163
 164 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
 165 {
 166 }
 167
 168 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
 169 {
 170         struct virtio_gpu_output *output =
 171                 drm_connector_to_virtio_gpu_output(connector);
 172         struct drm_display_mode *mode = NULL;
 173         int count, width, height;
 174
 175         width  = le32_to_cpu(output->info.r.width);
 176         height = le32_to_cpu(output->info.r.height);
 177         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 178
 179         if (width == 0 || height == 0) {
 180                 width = XRES_DEF;
 181                 height = YRES_DEF;
 182                 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 183         } else {
 184                 DRM_DEBUG("add mode: %dx%d\n", width, height);
 185                 mode = drm_cvt_mode(connector->dev, width, height, 60,
 186                                     false, false, false);
 187                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 188                 drm_mode_probed_add(connector, mode);
 189                 count++;
 190         }
 191
 192         return count;
 193 }
 194
 195 static int virtio_gpu_conn_mode_valid(struct drm_connector *connector,
 196                                       struct drm_display_mode *mode)
 197 {
 198         struct virtio_gpu_output *output =
 199                 drm_connector_to_virtio_gpu_output(connector);
 200         int width, height;
 201
 202         width  = le32_to_cpu(output->info.r.width);
 203         height = le32_to_cpu(output->info.r.height);
 204
 205         if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
 206                 return MODE_OK;
 207         if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
 208                 return MODE_OK;
 209         if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
 210             mode->vdisplay <= height && mode->vdisplay >= height - 16)
 211                 return MODE_OK;
 212
 213         DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
 214         return MODE_BAD;
 215 }
 216
 217 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
 218         .mode_set   = virtio_gpu_enc_mode_set,
 219         .enable     = virtio_gpu_enc_enable,
 220         .disable    = virtio_gpu_enc_disable,
 221 };
 222
 223 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
 224         .get_modes    = virtio_gpu_conn_get_modes,
 225         .mode_valid   = virtio_gpu_conn_mode_valid,
 226 };
 227
 228 static enum drm_connector_status virtio_gpu_conn_detect(
 229                         struct drm_connector *connector,
 230                         bool force)
 231 {
 232         struct virtio_gpu_output *output =
 233                 drm_connector_to_virtio_gpu_output(connector);
 234
 235         if (output->info.enabled)
 236                 return connector_status_connected;
 237         else
 238                 return connector_status_disconnected;
 239 }
 240
 241 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 242 {
 243         struct virtio_gpu_output *virtio_gpu_output =
 244                 drm_connector_to_virtio_gpu_output(connector);
 245
 246         drm_connector_unregister(connector);
 247         drm_connector_cleanup(connector);
 248         kfree(virtio_gpu_output);
 249 }
 250
 251 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 252         .dpms = drm_atomic_helper_connector_dpms,
 253         .detect = virtio_gpu_conn_detect,
 254         .fill_modes = drm_helper_probe_single_connector_modes,
 255         .destroy = virtio_gpu_conn_destroy,
 256         .reset = drm_atomic_helper_connector_reset,
 257         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 258         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 259 };
 260
 261 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
 262         .destroy = drm_encoder_cleanup,
 263 };
 264
 265 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 266 {
 267         struct drm_device *dev = vgdev->ddev;
 268         struct virtio_gpu_output *output = vgdev->outputs + index;
 269         struct drm_connector *connector = &output->conn;
 270         struct drm_encoder *encoder = &output->enc;
 271         struct drm_crtc *crtc = &output->crtc;
 272         struct drm_plane *primary, *cursor;
 273
 274         output->index = index;
 275         if (index == 0) {
 276                 output->info.enabled = cpu_to_le32(true);
 277                 output->info.r.width = cpu_to_le32(XRES_DEF);
 278                 output->info.r.height = cpu_to_le32(YRES_DEF);
 279         }
 280
 281         primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
 282         if (IS_ERR(primary))
 283                 return PTR_ERR(primary);
 284         cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
 285         if (IS_ERR(cursor))
 286                 return PTR_ERR(cursor);
 287         drm_crtc_init_with_planes(dev, crtc, primary, cursor,
 288                                   &virtio_gpu_crtc_funcs, NULL);
 289         drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 290         primary->crtc = crtc;
 291         cursor->crtc = crtc;
 292
 293         drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
 294                            DRM_MODE_CONNECTOR_VIRTUAL);
 295         drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
 296
 297         drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
 298                          DRM_MODE_ENCODER_VIRTUAL, NULL);
 299         drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
 300         encoder->possible_crtcs = 1 << index;
 301
 302         drm_mode_connector_attach_encoder(connector, encoder);
 303         drm_connector_register(connector);
 304         return 0;
 305 }
 306
 307 static struct drm_framebuffer *
 308 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 309                                    struct drm_file *file_priv,
 310                                    const struct drm_mode_fb_cmd2 *mode_cmd)
 311 {
 312         struct drm_gem_object *obj = NULL;
 313         struct virtio_gpu_framebuffer *virtio_gpu_fb;
 314         int ret;
 315
 316         /* lookup object associated with res handle */
 317         obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
 318         if (!obj)
 319                 return ERR_PTR(-EINVAL);
 320
 321         virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
 322         if (virtio_gpu_fb == NULL)
 323                 return ERR_PTR(-ENOMEM);
 324
 325         ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
 326         if (ret) {
 327                 kfree(virtio_gpu_fb);
 328                 drm_gem_object_unreference_unlocked(obj);
 329                 return NULL;
 330         }
 331
 332         return &virtio_gpu_fb->base;
 333 }
 334
 335 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
 336 {
 337         struct drm_device *dev = state->dev;
 338
 339         drm_atomic_helper_commit_modeset_disables(dev, state);
 340         drm_atomic_helper_commit_modeset_enables(dev, state);
 341         drm_atomic_helper_commit_planes(dev, state, true);
 342
 343         drm_atomic_helper_commit_hw_done(state);
 344
 345         drm_atomic_helper_wait_for_vblanks(dev, state);
 346         drm_atomic_helper_cleanup_planes(dev, state);
 347 }
 348
 349 static struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
 350         .atomic_commit_tail = vgdev_atomic_commit_tail,
 351 };
 352
 353 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
 354         .fb_create = virtio_gpu_user_framebuffer_create,
 355         .atomic_check = drm_atomic_helper_check,
 356         .atomic_commit = drm_atomic_helper_commit,
 357 };
 358
 359 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 360 {
 361         int i;
 362
 363         drm_mode_config_init(vgdev->ddev);
 364         vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
 365         vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
 366
 367         /* modes will be validated against the framebuffer size */
 368         vgdev->ddev->mode_config.min_width = XRES_MIN;
 369         vgdev->ddev->mode_config.min_height = YRES_MIN;
 370         vgdev->ddev->mode_config.max_width = XRES_MAX;
 371         vgdev->ddev->mode_config.max_height = YRES_MAX;
 372
 373         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 374                 vgdev_output_init(vgdev, i);
 375
 376         drm_mode_config_reset(vgdev->ddev);
 377         return 0;
 378 }
 379
 380 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
 381 {
 382         virtio_gpu_fbdev_fini(vgdev);
 383         drm_mode_config_cleanup(vgdev->ddev);
 384 }