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         struct virtqueue_info vqs_info[] = {
 120                 { "control", virtio_gpu_ctrl_ack },
 121                 { "cursor", virtio_gpu_cursor_ack },
 122         };
 123         struct virtio_gpu_device *vgdev;
 124         /* this will expand later */
 125         struct virtqueue *vqs[2];
 126         u32 num_scanouts, num_capsets;
 127         int ret = 0;
 128
 129         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 130                 return -ENODEV;
 131
 132         vgdev = drmm_kzalloc(dev, sizeof(struct virtio_gpu_device), GFP_KERNEL);
 133         if (!vgdev)
 134                 return -ENOMEM;
 135
 136         vgdev->ddev = dev;
 137         dev->dev_private = vgdev;
 138         vgdev->vdev = vdev;
 139
 140         spin_lock_init(&vgdev->display_info_lock);
 141         spin_lock_init(&vgdev->resource_export_lock);
 142         spin_lock_init(&vgdev->host_visible_lock);
 143         ida_init(&vgdev->ctx_id_ida);
 144         ida_init(&vgdev->resource_ida);
 145         init_waitqueue_head(&vgdev->resp_wq);
 146         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 147         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 148
 149         vgdev->fence_drv.context = dma_fence_context_alloc(1);
 150         spin_lock_init(&vgdev->fence_drv.lock);
 151         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 152         INIT_LIST_HEAD(&vgdev->cap_cache);
 153         INIT_WORK(&vgdev->config_changed_work,
 154                   virtio_gpu_config_changed_work_func);
 155
 156         INIT_WORK(&vgdev->obj_free_work,
 157                   virtio_gpu_array_put_free_work);
 158         INIT_LIST_HEAD(&vgdev->obj_free_list);
 159         spin_lock_init(&vgdev->obj_free_lock);
 160
 161 #ifdef __LITTLE_ENDIAN
 162         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
 163                 vgdev->has_virgl_3d = true;
 164 #endif
 165         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
 166                 vgdev->has_edid = true;
 167         }
 168         if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
 169                 vgdev->has_indirect = true;
 170         }
 171         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) {
 172                 vgdev->has_resource_assign_uuid = true;
 173         }
 174         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_BLOB)) {
 175                 vgdev->has_resource_blob = true;
 176         }
 177         if (virtio_get_shm_region(vgdev->vdev, &vgdev->host_visible_region,
 178                                   VIRTIO_GPU_SHM_ID_HOST_VISIBLE)) {
 179                 if (!devm_request_mem_region(&vgdev->vdev->dev,
 180                                              vgdev->host_visible_region.addr,
 181                                              vgdev->host_visible_region.len,
 182                                              dev_name(&vgdev->vdev->dev))) {
 183                         DRM_ERROR("Could not reserve host visible region\n");
 184                         ret = -EBUSY;
 185                         goto err_vqs;
 186                 }
 187
 188                 DRM_INFO("Host memory window: 0x%lx +0x%lx\n",
 189                          (unsigned long)vgdev->host_visible_region.addr,
 190                          (unsigned long)vgdev->host_visible_region.len);
 191                 vgdev->has_host_visible = true;
 192                 drm_mm_init(&vgdev->host_visible_mm,
 193                             (unsigned long)vgdev->host_visible_region.addr,
 194                             (unsigned long)vgdev->host_visible_region.len);
 195         }
 196         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_CONTEXT_INIT)) {
 197                 vgdev->has_context_init = true;
 198         }
 199
 200         DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible",
 201                  vgdev->has_virgl_3d    ? '+' : '-',
 202                  vgdev->has_edid        ? '+' : '-',
 203                  vgdev->has_resource_blob ? '+' : '-',
 204                  vgdev->has_host_visible ? '+' : '-');
 205
 206         DRM_INFO("features: %ccontext_init\n",
 207                  vgdev->has_context_init ? '+' : '-');
 208
 209         ret = virtio_find_vqs(vgdev->vdev, 2, vqs, vqs_info, NULL);
 210         if (ret) {
 211                 DRM_ERROR("failed to find virt queues\n");
 212                 goto err_vqs;
 213         }
 214         vgdev->ctrlq.vq = vqs[0];
 215         vgdev->cursorq.vq = vqs[1];
 216         ret = virtio_gpu_alloc_vbufs(vgdev);
 217         if (ret) {
 218                 DRM_ERROR("failed to alloc vbufs\n");
 219                 goto err_vbufs;
 220         }
 221
 222         /* get display info */
 223         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
 224                         num_scanouts, &num_scanouts);
 225         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
 226                                     VIRTIO_GPU_MAX_SCANOUTS);
 227
 228         if (!IS_ENABLED(CONFIG_DRM_VIRTIO_GPU_KMS) || !vgdev->num_scanouts) {
 229                 DRM_INFO("KMS disabled\n");
 230                 vgdev->num_scanouts = 0;
 231                 vgdev->has_edid = false;
 232                 dev->driver_features &= ~(DRIVER_MODESET | DRIVER_ATOMIC);
 233         } else {
 234                 DRM_INFO("number of scanouts: %d\n", num_scanouts);
 235         }
 236
 237         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
 238                         num_capsets, &num_capsets);
 239         DRM_INFO("number of cap sets: %d\n", num_capsets);
 240
 241         ret = virtio_gpu_modeset_init(vgdev);
 242         if (ret) {
 243                 DRM_ERROR("modeset init failed\n");
 244                 goto err_scanouts;
 245         }
 246
 247         virtio_device_ready(vgdev->vdev);
 248
 249         if (num_capsets)
 250                 virtio_gpu_get_capsets(vgdev, num_capsets);
 251         if (vgdev->num_scanouts) {
 252                 if (vgdev->has_edid)
 253                         virtio_gpu_cmd_get_edids(vgdev);
 254                 virtio_gpu_cmd_get_display_info(vgdev);
 255                 virtio_gpu_notify(vgdev);
 256                 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 257                                    5 * HZ);
 258         }
 259         return 0;
 260
 261 err_scanouts:
 262         virtio_gpu_free_vbufs(vgdev);
 263 err_vbufs:
 264         vgdev->vdev->config->del_vqs(vgdev->vdev);
 265 err_vqs:
 266         dev->dev_private = NULL;
 267         return ret;
 268 }
 269
 270 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
 271 {
 272         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
 273
 274         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
 275                 kfree(cache_ent->caps_cache);
 276                 kfree(cache_ent);
 277         }
 278 }
 279
 280 void virtio_gpu_deinit(struct drm_device *dev)
 281 {
 282         struct virtio_gpu_device *vgdev = dev->dev_private;
 283
 284         flush_work(&vgdev->obj_free_work);
 285         flush_work(&vgdev->ctrlq.dequeue_work);
 286         flush_work(&vgdev->cursorq.dequeue_work);
 287         flush_work(&vgdev->config_changed_work);
 288         virtio_reset_device(vgdev->vdev);
 289         vgdev->vdev->config->del_vqs(vgdev->vdev);
 290 }
 291
 292 void virtio_gpu_release(struct drm_device *dev)
 293 {
 294         struct virtio_gpu_device *vgdev = dev->dev_private;
 295
 296         if (!vgdev)
 297                 return;
 298
 299         virtio_gpu_modeset_fini(vgdev);
 300         virtio_gpu_free_vbufs(vgdev);
 301         virtio_gpu_cleanup_cap_cache(vgdev);
 302
 303         if (vgdev->has_host_visible)
 304                 drm_mm_takedown(&vgdev->host_visible_mm);
 305 }
 306
 307 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 308 {
 309         struct virtio_gpu_device *vgdev = dev->dev_private;
 310         struct virtio_gpu_fpriv *vfpriv;
 311         int handle;
 312
 313         /* can't create contexts without 3d renderer */
 314         if (!vgdev->has_virgl_3d)
 315                 return 0;
 316
 317         /* allocate a virt GPU context for this opener */
 318         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
 319         if (!vfpriv)
 320                 return -ENOMEM;
 321
 322         mutex_init(&vfpriv->context_lock);
 323
 324         handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
 325         if (handle < 0) {
 326                 kfree(vfpriv);
 327                 return handle;
 328         }
 329
 330         vfpriv->ctx_id = handle + 1;
 331         file->driver_priv = vfpriv;
 332         return 0;
 333 }
 334
 335 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 336 {
 337         struct virtio_gpu_device *vgdev = dev->dev_private;
 338         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 339
 340         if (!vgdev->has_virgl_3d)
 341                 return;
 342
 343         if (vfpriv->context_created) {
 344                 virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
 345                 virtio_gpu_notify(vgdev);
 346         }
 347
 348         ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
 349         mutex_destroy(&vfpriv->context_lock);
 350         kfree(vfpriv);
 351         file->driver_priv = NULL;
 352 }