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