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         drm_helper_mode_fill_fb_struct(dev, &vgfb->base, mode_cmd);
  92
  93         ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
  94         if (ret) {
  95                 vgfb->obj = NULL;
  96                 return ret;
  97         }
  98
  99         spin_lock_init(&vgfb->dirty_lock);
 100         vgfb->x1 = vgfb->y1 = INT_MAX;
 101         vgfb->x2 = vgfb->y2 = 0;
 102         return 0;
 103 }
 104
 105 static void virtio_gpu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 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,
 112                                    crtc->mode.hdisplay,
 113                                    crtc->mode.vdisplay, 0, 0);
 114 }
 115
 116 static void virtio_gpu_crtc_enable(struct drm_crtc *crtc)
 117 {
 118 }
 119
 120 static void virtio_gpu_crtc_disable(struct drm_crtc *crtc)
 121 {
 122         struct drm_device *dev = crtc->dev;
 123         struct virtio_gpu_device *vgdev = dev->dev_private;
 124         struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 125
 126         virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
 127 }
 128
 129 static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 130                                         struct drm_crtc_state *state)
 131 {
 132         return 0;
 133 }
 134
 135 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 136                                          struct drm_crtc_state *old_state)
 137 {
 138         unsigned long flags;
 139
 140         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 141         if (crtc->state->event)
 142                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 143         crtc->state->event = NULL;
 144         spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 145 }
 146
 147 static const struct drm_crtc_helper_funcs virtio_gpu_crtc_helper_funcs = {
 148         .enable        = virtio_gpu_crtc_enable,
 149         .disable       = virtio_gpu_crtc_disable,
 150         .mode_set_nofb = virtio_gpu_crtc_mode_set_nofb,
 151         .atomic_check  = virtio_gpu_crtc_atomic_check,
 152         .atomic_flush  = virtio_gpu_crtc_atomic_flush,
 153 };
 154
 155 static void virtio_gpu_enc_mode_set(struct drm_encoder *encoder,
 156                                     struct drm_display_mode *mode,
 157                                     struct drm_display_mode *adjusted_mode)
 158 {
 159 }
 160
 161 static void virtio_gpu_enc_enable(struct drm_encoder *encoder)
 162 {
 163 }
 164
 165 static void virtio_gpu_enc_disable(struct drm_encoder *encoder)
 166 {
 167 }
 168
 169 static int virtio_gpu_conn_get_modes(struct drm_connector *connector)
 170 {
 171         struct virtio_gpu_output *output =
 172                 drm_connector_to_virtio_gpu_output(connector);
 173         struct drm_display_mode *mode = NULL;
 174         int count, width, height;
 175
 176         width  = le32_to_cpu(output->info.r.width);
 177         height = le32_to_cpu(output->info.r.height);
 178         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 179
 180         if (width == 0 || height == 0) {
 181                 width = XRES_DEF;
 182                 height = YRES_DEF;
 183                 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 184         } else {
 185                 DRM_DEBUG("add mode: %dx%d\n", width, height);
 186                 mode = drm_cvt_mode(connector->dev, width, height, 60,
 187                                     false, false, false);
 188                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 189                 drm_mode_probed_add(connector, mode);
 190                 count++;
 191         }
 192
 193         return count;
 194 }
 195
 196 static int virtio_gpu_conn_mode_valid(struct drm_connector *connector,
 197                                       struct drm_display_mode *mode)
 198 {
 199         struct virtio_gpu_output *output =
 200                 drm_connector_to_virtio_gpu_output(connector);
 201         int width, height;
 202
 203         width  = le32_to_cpu(output->info.r.width);
 204         height = le32_to_cpu(output->info.r.height);
 205
 206         if (!(mode->type & DRM_MODE_TYPE_PREFERRED))
 207                 return MODE_OK;
 208         if (mode->hdisplay == XRES_DEF && mode->vdisplay == YRES_DEF)
 209                 return MODE_OK;
 210         if (mode->hdisplay <= width  && mode->hdisplay >= width - 16 &&
 211             mode->vdisplay <= height && mode->vdisplay >= height - 16)
 212                 return MODE_OK;
 213
 214         DRM_DEBUG("del mode: %dx%d\n", mode->hdisplay, mode->vdisplay);
 215         return MODE_BAD;
 216 }
 217
 218 static const struct drm_encoder_helper_funcs virtio_gpu_enc_helper_funcs = {
 219         .mode_set   = virtio_gpu_enc_mode_set,
 220         .enable     = virtio_gpu_enc_enable,
 221         .disable    = virtio_gpu_enc_disable,
 222 };
 223
 224 static const struct drm_connector_helper_funcs virtio_gpu_conn_helper_funcs = {
 225         .get_modes    = virtio_gpu_conn_get_modes,
 226         .mode_valid   = virtio_gpu_conn_mode_valid,
 227 };
 228
 229 static enum drm_connector_status virtio_gpu_conn_detect(
 230                         struct drm_connector *connector,
 231                         bool force)
 232 {
 233         struct virtio_gpu_output *output =
 234                 drm_connector_to_virtio_gpu_output(connector);
 235
 236         if (output->info.enabled)
 237                 return connector_status_connected;
 238         else
 239                 return connector_status_disconnected;
 240 }
 241
 242 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 243 {
 244         struct virtio_gpu_output *virtio_gpu_output =
 245                 drm_connector_to_virtio_gpu_output(connector);
 246
 247         drm_connector_unregister(connector);
 248         drm_connector_cleanup(connector);
 249         kfree(virtio_gpu_output);
 250 }
 251
 252 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 253         .dpms = drm_atomic_helper_connector_dpms,
 254         .detect = virtio_gpu_conn_detect,
 255         .fill_modes = drm_helper_probe_single_connector_modes,
 256         .destroy = virtio_gpu_conn_destroy,
 257         .reset = drm_atomic_helper_connector_reset,
 258         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 259         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 260 };
 261
 262 static const struct drm_encoder_funcs virtio_gpu_enc_funcs = {
 263         .destroy = drm_encoder_cleanup,
 264 };
 265
 266 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 267 {
 268         struct drm_device *dev = vgdev->ddev;
 269         struct virtio_gpu_output *output = vgdev->outputs + index;
 270         struct drm_connector *connector = &output->conn;
 271         struct drm_encoder *encoder = &output->enc;
 272         struct drm_crtc *crtc = &output->crtc;
 273         struct drm_plane *primary, *cursor;
 274
 275         output->index = index;
 276         if (index == 0) {
 277                 output->info.enabled = cpu_to_le32(true);
 278                 output->info.r.width = cpu_to_le32(XRES_DEF);
 279                 output->info.r.height = cpu_to_le32(YRES_DEF);
 280         }
 281
 282         primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, index);
 283         if (IS_ERR(primary))
 284                 return PTR_ERR(primary);
 285         cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
 286         if (IS_ERR(cursor))
 287                 return PTR_ERR(cursor);
 288         drm_crtc_init_with_planes(dev, crtc, primary, cursor,
 289                                   &virtio_gpu_crtc_funcs, NULL);
 290         drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 291         primary->crtc = crtc;
 292         cursor->crtc = crtc;
 293
 294         drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
 295                            DRM_MODE_CONNECTOR_VIRTUAL);
 296         drm_connector_helper_add(connector, &virtio_gpu_conn_helper_funcs);
 297
 298         drm_encoder_init(dev, encoder, &virtio_gpu_enc_funcs,
 299                          DRM_MODE_ENCODER_VIRTUAL, NULL);
 300         drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
 301         encoder->possible_crtcs = 1 << index;
 302
 303         drm_mode_connector_attach_encoder(connector, encoder);
 304         drm_connector_register(connector);
 305         return 0;
 306 }
 307
 308 static struct drm_framebuffer *
 309 virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 310                                    struct drm_file *file_priv,
 311                                    const struct drm_mode_fb_cmd2 *mode_cmd)
 312 {
 313         struct drm_gem_object *obj = NULL;
 314         struct virtio_gpu_framebuffer *virtio_gpu_fb;
 315         int ret;
 316
 317         /* lookup object associated with res handle */
 318         obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
 319         if (!obj)
 320                 return ERR_PTR(-EINVAL);
 321
 322         virtio_gpu_fb = kzalloc(sizeof(*virtio_gpu_fb), GFP_KERNEL);
 323         if (virtio_gpu_fb == NULL)
 324                 return ERR_PTR(-ENOMEM);
 325
 326         ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
 327         if (ret) {
 328                 kfree(virtio_gpu_fb);
 329                 drm_gem_object_unreference_unlocked(obj);
 330                 return NULL;
 331         }
 332
 333         return &virtio_gpu_fb->base;
 334 }
 335
 336 static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
 337 {
 338         struct drm_device *dev = state->dev;
 339
 340         drm_atomic_helper_commit_modeset_disables(dev, state);
 341         drm_atomic_helper_commit_modeset_enables(dev, state);
 342         drm_atomic_helper_commit_planes(dev, state, 0);
 343
 344         drm_atomic_helper_commit_hw_done(state);
 345
 346         drm_atomic_helper_wait_for_vblanks(dev, state);
 347         drm_atomic_helper_cleanup_planes(dev, state);
 348 }
 349
 350 static const struct drm_mode_config_helper_funcs virtio_mode_config_helpers = {
 351         .atomic_commit_tail = vgdev_atomic_commit_tail,
 352 };
 353
 354 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
 355         .fb_create = virtio_gpu_user_framebuffer_create,
 356         .atomic_check = drm_atomic_helper_check,
 357         .atomic_commit = drm_atomic_helper_commit,
 358 };
 359
 360 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)
 361 {
 362         int i;
 363
 364         drm_mode_config_init(vgdev->ddev);
 365         vgdev->ddev->mode_config.funcs = &virtio_gpu_mode_funcs;
 366         vgdev->ddev->mode_config.helper_private = &virtio_mode_config_helpers;
 367
 368         /* modes will be validated against the framebuffer size */
 369         vgdev->ddev->mode_config.min_width = XRES_MIN;
 370         vgdev->ddev->mode_config.min_height = YRES_MIN;
 371         vgdev->ddev->mode_config.max_width = XRES_MAX;
 372         vgdev->ddev->mode_config.max_height = YRES_MAX;
 373
 374         for (i = 0 ; i < vgdev->num_scanouts; ++i)
 375                 vgdev_output_init(vgdev, i);
 376
 377         drm_mode_config_reset(vgdev->ddev);
 378         return 0;
 379 }
 380
 381 void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
 382 {
 383         virtio_gpu_fbdev_fini(vgdev);
 384         drm_mode_config_cleanup(vgdev->ddev);
 385 }