drivers/gpu/drm/virtio/virtgpu_kms.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include <linux/virtio.h>
  27 #include <linux/virtio_config.h>
  28 #include <linux/virtio_ring.h>
  29
  30 #include <drm/drm_file.h>
  31 #include <drm/drm_managed.h>
  32
  33 #include "virtgpu_drv.h"
  34
  35 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
  36 {
  37         struct virtio_gpu_device *vgdev =
  38                 container_of(work, struct virtio_gpu_device,
  39                              config_changed_work);
  40         u32 events_read, events_clear = 0;
  41
  42         /* read the config space */
  43         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
  44                         events_read, &events_read);
  45         if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
  46                 if (vgdev->num_scanouts) {
  47                         if (vgdev->has_edid)
  48                                 virtio_gpu_cmd_get_edids(vgdev);
  49                         virtio_gpu_cmd_get_display_info(vgdev);
  50                         virtio_gpu_notify(vgdev);
  51                         drm_helper_hpd_irq_event(vgdev->ddev);
  52                 }
  53                 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
  54         }
  55         virtio_cwrite_le(vgdev->vdev, struct virtio_gpu_config,
  56                          events_clear, &events_clear);
  57 }
  58
  59 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
  60                                void (*work_func)(struct work_struct *work))
  61 {
  62         spin_lock_init(&vgvq->qlock);
  63         init_waitqueue_head(&vgvq->ack_queue);
  64         INIT_WORK(&vgvq->dequeue_work, work_func);
  65 }
  66
  67 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
  68                                    int num_capsets)
  69 {
  70         int i, ret;
  71         bool invalid_capset_id = false;
  72         struct drm_device *drm = vgdev->ddev;
  73
  74         vgdev->capsets = drmm_kcalloc(drm, num_capsets,
  75                                       sizeof(struct virtio_gpu_drv_capset),
  76                                       GFP_KERNEL);
  77         if (!vgdev->capsets) {
  78                 DRM_ERROR("failed to allocate cap sets\n");
  79                 return;
  80         }
  81         for (i = 0; i < num_capsets; i++) {
  82                 virtio_gpu_cmd_get_capset_info(vgdev, i);
  83                 virtio_gpu_notify(vgdev);
  84                 ret = wait_event_timeout(vgdev->resp_wq,
  85                                          vgdev->capsets[i].id > 0, 5 * HZ);
  86                 /*
  87                  * Capability ids are defined in the virtio-gpu spec and are
  88                  * between 1 to 63, inclusive.
  89                  */
  90                 if (!vgdev->capsets[i].id ||
  91                     vgdev->capsets[i].id > MAX_CAPSET_ID)
  92                         invalid_capset_id = true;
  93
  94                 if (ret == 0)
  95                         DRM_ERROR("timed out waiting for cap set %d\n", i);
  96                 else if (invalid_capset_id)
  97                         DRM_ERROR("invalid capset id %u", vgdev->capsets[i].id);
  98
  99                 if (ret == 0 || invalid_capset_id) {
 100                         spin_lock(&vgdev->display_info_lock);
 101                         drmm_kfree(drm, vgdev->capsets);
 102                         vgdev->capsets = NULL;
 103                         spin_unlock(&vgdev->display_info_lock);
 104                         return;
 105                 }
 106
 107                 vgdev->capset_id_mask |= 1 << vgdev->capsets[i].id;
 108                 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
 109                          i, vgdev->capsets[i].id,
 110                          vgdev->capsets[i].max_version,
 111                          vgdev->capsets[i].max_size);
 112         }
 113
 114         vgdev->num_capsets = num_capsets;
 115 }
 116
 117 int virtio_gpu_init(struct virtio_device *vdev, struct drm_device *dev)
 118 {
 119         static vq_callback_t *callbacks[] = {
 120                 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
 121         };
 122         static const char * const names[] = { "control", "cursor" };
 123
 124         struct virtio_gpu_device *vgdev;
 125         /* this will expand later */
 126         struct virtqueue *vqs[2];
 127         u32 num_scanouts, num_capsets;
 128         int ret = 0;
 129
 130         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 131                 return -ENODEV;
 132
 133         vgdev = drmm_kzalloc(dev, sizeof(struct virtio_gpu_device), GFP_KERNEL);
 134         if (!vgdev)
 135                 return -ENOMEM;
 136
 137         vgdev->ddev = dev;
 138         dev->dev_private = vgdev;
 139         vgdev->vdev = vdev;
 140
 141         spin_lock_init(&vgdev->display_info_lock);
 142         spin_lock_init(&vgdev->resource_export_lock);
 143         spin_lock_init(&vgdev->host_visible_lock);
 144         ida_init(&vgdev->ctx_id_ida);
 145         ida_init(&vgdev->resource_ida);
 146         init_waitqueue_head(&vgdev->resp_wq);
 147         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 148         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 149
 150         vgdev->fence_drv.context = dma_fence_context_alloc(1);
 151         spin_lock_init(&vgdev->fence_drv.lock);
 152         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 153         INIT_LIST_HEAD(&vgdev->cap_cache);
 154         INIT_WORK(&vgdev->config_changed_work,
 155                   virtio_gpu_config_changed_work_func);
 156
 157         INIT_WORK(&vgdev->obj_free_work,
 158                   virtio_gpu_array_put_free_work);
 159         INIT_LIST_HEAD(&vgdev->obj_free_list);
 160         spin_lock_init(&vgdev->obj_free_lock);
 161
 162 #ifdef __LITTLE_ENDIAN
 163         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
 164                 vgdev->has_virgl_3d = true;
 165 #endif
 166         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
 167                 vgdev->has_edid = true;
 168         }
 169         if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
 170                 vgdev->has_indirect = true;
 171         }
 172         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) {
 173                 vgdev->has_resource_assign_uuid = true;
 174         }
 175         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_BLOB)) {
 176                 vgdev->has_resource_blob = true;
 177         }
 178         if (virtio_get_shm_region(vgdev->vdev, &vgdev->host_visible_region,
 179                                   VIRTIO_GPU_SHM_ID_HOST_VISIBLE)) {
 180                 if (!devm_request_mem_region(&vgdev->vdev->dev,
 181                                              vgdev->host_visible_region.addr,
 182                                              vgdev->host_visible_region.len,
 183                                              dev_name(&vgdev->vdev->dev))) {
 184                         DRM_ERROR("Could not reserve host visible region\n");
 185                         ret = -EBUSY;
 186                         goto err_vqs;
 187                 }
 188
 189                 DRM_INFO("Host memory window: 0x%lx +0x%lx\n",
 190                          (unsigned long)vgdev->host_visible_region.addr,
 191                          (unsigned long)vgdev->host_visible_region.len);
 192                 vgdev->has_host_visible = true;
 193                 drm_mm_init(&vgdev->host_visible_mm,
 194                             (unsigned long)vgdev->host_visible_region.addr,
 195                             (unsigned long)vgdev->host_visible_region.len);
 196         }
 197         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_CONTEXT_INIT)) {
 198                 vgdev->has_context_init = true;
 199         }
 200
 201         DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible",
 202                  vgdev->has_virgl_3d    ? '+' : '-',
 203                  vgdev->has_edid        ? '+' : '-',
 204                  vgdev->has_resource_blob ? '+' : '-',
 205                  vgdev->has_host_visible ? '+' : '-');
 206
 207         DRM_INFO("features: %ccontext_init\n",
 208                  vgdev->has_context_init ? '+' : '-');
 209
 210         ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
 211         if (ret) {
 212                 DRM_ERROR("failed to find virt queues\n");
 213                 goto err_vqs;
 214         }
 215         vgdev->ctrlq.vq = vqs[0];
 216         vgdev->cursorq.vq = vqs[1];
 217         ret = virtio_gpu_alloc_vbufs(vgdev);
 218         if (ret) {
 219                 DRM_ERROR("failed to alloc vbufs\n");
 220                 goto err_vbufs;
 221         }
 222
 223         /* get display info */
 224         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
 225                         num_scanouts, &num_scanouts);
 226         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
 227                                     VIRTIO_GPU_MAX_SCANOUTS);
 228
 229         if (!IS_ENABLED(CONFIG_DRM_VIRTIO_GPU_KMS) || !vgdev->num_scanouts) {
 230                 DRM_INFO("KMS disabled\n");
 231                 vgdev->num_scanouts = 0;
 232                 vgdev->has_edid = false;
 233                 dev->driver_features &= ~(DRIVER_MODESET | DRIVER_ATOMIC);
 234         } else {
 235                 DRM_INFO("number of scanouts: %d\n", num_scanouts);
 236         }
 237
 238         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
 239                         num_capsets, &num_capsets);
 240         DRM_INFO("number of cap sets: %d\n", num_capsets);
 241
 242         ret = virtio_gpu_modeset_init(vgdev);
 243         if (ret) {
 244                 DRM_ERROR("modeset init failed\n");
 245                 goto err_scanouts;
 246         }
 247
 248         virtio_device_ready(vgdev->vdev);
 249
 250         if (num_capsets)
 251                 virtio_gpu_get_capsets(vgdev, num_capsets);
 252         if (vgdev->num_scanouts) {
 253                 if (vgdev->has_edid)
 254                         virtio_gpu_cmd_get_edids(vgdev);
 255                 virtio_gpu_cmd_get_display_info(vgdev);
 256                 virtio_gpu_notify(vgdev);
 257                 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 258                                    5 * HZ);
 259         }
 260         return 0;
 261
 262 err_scanouts:
 263         virtio_gpu_free_vbufs(vgdev);
 264 err_vbufs:
 265         vgdev->vdev->config->del_vqs(vgdev->vdev);
 266 err_vqs:
 267         dev->dev_private = NULL;
 268         return ret;
 269 }
 270
 271 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
 272 {
 273         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
 274
 275         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
 276                 kfree(cache_ent->caps_cache);
 277                 kfree(cache_ent);
 278         }
 279 }
 280
 281 void virtio_gpu_deinit(struct drm_device *dev)
 282 {
 283         struct virtio_gpu_device *vgdev = dev->dev_private;
 284
 285         flush_work(&vgdev->obj_free_work);
 286         flush_work(&vgdev->ctrlq.dequeue_work);
 287         flush_work(&vgdev->cursorq.dequeue_work);
 288         flush_work(&vgdev->config_changed_work);
 289         virtio_reset_device(vgdev->vdev);
 290         vgdev->vdev->config->del_vqs(vgdev->vdev);
 291 }
 292
 293 void virtio_gpu_release(struct drm_device *dev)
 294 {
 295         struct virtio_gpu_device *vgdev = dev->dev_private;
 296
 297         if (!vgdev)
 298                 return;
 299
 300         virtio_gpu_modeset_fini(vgdev);
 301         virtio_gpu_free_vbufs(vgdev);
 302         virtio_gpu_cleanup_cap_cache(vgdev);
 303
 304         if (vgdev->has_host_visible)
 305                 drm_mm_takedown(&vgdev->host_visible_mm);
 306 }
 307
 308 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 309 {
 310         struct virtio_gpu_device *vgdev = dev->dev_private;
 311         struct virtio_gpu_fpriv *vfpriv;
 312         int handle;
 313
 314         /* can't create contexts without 3d renderer */
 315         if (!vgdev->has_virgl_3d)
 316                 return 0;
 317
 318         /* allocate a virt GPU context for this opener */
 319         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
 320         if (!vfpriv)
 321                 return -ENOMEM;
 322
 323         mutex_init(&vfpriv->context_lock);
 324
 325         handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
 326         if (handle < 0) {
 327                 kfree(vfpriv);
 328                 return handle;
 329         }
 330
 331         vfpriv->ctx_id = handle + 1;
 332         file->driver_priv = vfpriv;
 333         return 0;
 334 }
 335
 336 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 337 {
 338         struct virtio_gpu_device *vgdev = dev->dev_private;
 339         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 340
 341         if (!vgdev->has_virgl_3d)
 342                 return;
 343
 344         if (vfpriv->context_created) {
 345                 virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
 346                 virtio_gpu_notify(vgdev);
 347         }
 348
 349         ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
 350         mutex_destroy(&vfpriv->context_lock);
 351         kfree(vfpriv);
 352         file->driver_priv = NULL;
 353 }