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 <drm/drmP.h>
  29 #include "virtgpu_drv.h"
  30
  31 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
  32 {
  33         struct virtio_gpu_device *vgdev =
  34                 container_of(work, struct virtio_gpu_device,
  35                              config_changed_work);
  36         u32 events_read, events_clear = 0;
  37
  38         /* read the config space */
  39         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
  40                      events_read, &events_read);
  41         if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
  42                 if (vgdev->has_edid)
  43                         virtio_gpu_cmd_get_edids(vgdev);
  44                 virtio_gpu_cmd_get_display_info(vgdev);
  45                 drm_helper_hpd_irq_event(vgdev->ddev);
  46                 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
  47         }
  48         virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
  49                       events_clear, &events_clear);
  50 }
  51
  52 static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
  53                                       uint32_t nlen, const char *name)
  54 {
  55         int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
  56
  57         if (handle < 0)
  58                 return handle;
  59         handle += 1;
  60         virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
  61         return handle;
  62 }
  63
  64 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
  65                                       uint32_t ctx_id)
  66 {
  67         virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
  68         ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
  69 }
  70
  71 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
  72                                void (*work_func)(struct work_struct *work))
  73 {
  74         spin_lock_init(&vgvq->qlock);
  75         init_waitqueue_head(&vgvq->ack_queue);
  76         INIT_WORK(&vgvq->dequeue_work, work_func);
  77 }
  78
  79 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
  80                                    int num_capsets)
  81 {
  82         int i, ret;
  83
  84         vgdev->capsets = kcalloc(num_capsets,
  85                                  sizeof(struct virtio_gpu_drv_capset),
  86                                  GFP_KERNEL);
  87         if (!vgdev->capsets) {
  88                 DRM_ERROR("failed to allocate cap sets\n");
  89                 return;
  90         }
  91         for (i = 0; i < num_capsets; i++) {
  92                 virtio_gpu_cmd_get_capset_info(vgdev, i);
  93                 ret = wait_event_timeout(vgdev->resp_wq,
  94                                          vgdev->capsets[i].id > 0, 5 * HZ);
  95                 if (ret == 0) {
  96                         DRM_ERROR("timed out waiting for cap set %d\n", i);
  97                         kfree(vgdev->capsets);
  98                         vgdev->capsets = NULL;
  99                         return;
 100                 }
 101                 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
 102                          i, vgdev->capsets[i].id,
 103                          vgdev->capsets[i].max_version,
 104                          vgdev->capsets[i].max_size);
 105         }
 106         vgdev->num_capsets = num_capsets;
 107 }
 108
 109 int virtio_gpu_init(struct drm_device *dev)
 110 {
 111         static vq_callback_t *callbacks[] = {
 112                 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
 113         };
 114         static const char * const names[] = { "control", "cursor" };
 115
 116         struct virtio_gpu_device *vgdev;
 117         /* this will expand later */
 118         struct virtqueue *vqs[2];
 119         u32 num_scanouts, num_capsets;
 120         int ret;
 121
 122         if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
 123                 return -ENODEV;
 124
 125         vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
 126         if (!vgdev)
 127                 return -ENOMEM;
 128
 129         vgdev->ddev = dev;
 130         dev->dev_private = vgdev;
 131         vgdev->vdev = dev_to_virtio(dev->dev);
 132         vgdev->dev = dev->dev;
 133
 134         spin_lock_init(&vgdev->display_info_lock);
 135         ida_init(&vgdev->ctx_id_ida);
 136         ida_init(&vgdev->resource_ida);
 137         init_waitqueue_head(&vgdev->resp_wq);
 138         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 139         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 140
 141         vgdev->fence_drv.context = dma_fence_context_alloc(1);
 142         spin_lock_init(&vgdev->fence_drv.lock);
 143         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 144         INIT_LIST_HEAD(&vgdev->cap_cache);
 145         INIT_WORK(&vgdev->config_changed_work,
 146                   virtio_gpu_config_changed_work_func);
 147
 148 #ifdef __LITTLE_ENDIAN
 149         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
 150                 vgdev->has_virgl_3d = true;
 151         DRM_INFO("virgl 3d acceleration %s\n",
 152                  vgdev->has_virgl_3d ? "enabled" : "not supported by host");
 153 #else
 154         DRM_INFO("virgl 3d acceleration not supported by guest\n");
 155 #endif
 156         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
 157                 vgdev->has_edid = true;
 158                 DRM_INFO("EDID support available.\n");
 159         }
 160
 161         ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
 162         if (ret) {
 163                 DRM_ERROR("failed to find virt queues\n");
 164                 goto err_vqs;
 165         }
 166         vgdev->ctrlq.vq = vqs[0];
 167         vgdev->cursorq.vq = vqs[1];
 168         ret = virtio_gpu_alloc_vbufs(vgdev);
 169         if (ret) {
 170                 DRM_ERROR("failed to alloc vbufs\n");
 171                 goto err_vbufs;
 172         }
 173
 174         ret = virtio_gpu_ttm_init(vgdev);
 175         if (ret) {
 176                 DRM_ERROR("failed to init ttm %d\n", ret);
 177                 goto err_ttm;
 178         }
 179
 180         /* get display info */
 181         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 182                      num_scanouts, &num_scanouts);
 183         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
 184                                     VIRTIO_GPU_MAX_SCANOUTS);
 185         if (!vgdev->num_scanouts) {
 186                 DRM_ERROR("num_scanouts is zero\n");
 187                 ret = -EINVAL;
 188                 goto err_scanouts;
 189         }
 190         DRM_INFO("number of scanouts: %d\n", num_scanouts);
 191
 192         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 193                      num_capsets, &num_capsets);
 194         DRM_INFO("number of cap sets: %d\n", num_capsets);
 195
 196         virtio_gpu_modeset_init(vgdev);
 197
 198         virtio_device_ready(vgdev->vdev);
 199         vgdev->vqs_ready = true;
 200
 201         if (num_capsets)
 202                 virtio_gpu_get_capsets(vgdev, num_capsets);
 203         if (vgdev->has_edid)
 204                 virtio_gpu_cmd_get_edids(vgdev);
 205         virtio_gpu_cmd_get_display_info(vgdev);
 206         wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 207                            5 * HZ);
 208         return 0;
 209
 210 err_scanouts:
 211         virtio_gpu_ttm_fini(vgdev);
 212 err_ttm:
 213         virtio_gpu_free_vbufs(vgdev);
 214 err_vbufs:
 215         vgdev->vdev->config->del_vqs(vgdev->vdev);
 216 err_vqs:
 217         kfree(vgdev);
 218         return ret;
 219 }
 220
 221 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
 222 {
 223         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
 224
 225         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
 226                 kfree(cache_ent->caps_cache);
 227                 kfree(cache_ent);
 228         }
 229 }
 230
 231 void virtio_gpu_deinit(struct drm_device *dev)
 232 {
 233         struct virtio_gpu_device *vgdev = dev->dev_private;
 234
 235         vgdev->vqs_ready = false;
 236         flush_work(&vgdev->ctrlq.dequeue_work);
 237         flush_work(&vgdev->cursorq.dequeue_work);
 238         flush_work(&vgdev->config_changed_work);
 239         vgdev->vdev->config->reset(vgdev->vdev);
 240         vgdev->vdev->config->del_vqs(vgdev->vdev);
 241
 242         virtio_gpu_modeset_fini(vgdev);
 243         virtio_gpu_ttm_fini(vgdev);
 244         virtio_gpu_free_vbufs(vgdev);
 245         virtio_gpu_cleanup_cap_cache(vgdev);
 246         kfree(vgdev->capsets);
 247         kfree(vgdev);
 248 }
 249
 250 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 251 {
 252         struct virtio_gpu_device *vgdev = dev->dev_private;
 253         struct virtio_gpu_fpriv *vfpriv;
 254         int id;
 255         char dbgname[TASK_COMM_LEN];
 256
 257         /* can't create contexts without 3d renderer */
 258         if (!vgdev->has_virgl_3d)
 259                 return 0;
 260
 261         /* allocate a virt GPU context for this opener */
 262         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
 263         if (!vfpriv)
 264                 return -ENOMEM;
 265
 266         get_task_comm(dbgname, current);
 267         id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
 268         if (id < 0) {
 269                 kfree(vfpriv);
 270                 return id;
 271         }
 272
 273         vfpriv->ctx_id = id;
 274         file->driver_priv = vfpriv;
 275         return 0;
 276 }
 277
 278 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 279 {
 280         struct virtio_gpu_device *vgdev = dev->dev_private;
 281         struct virtio_gpu_fpriv *vfpriv;
 282
 283         if (!vgdev->has_virgl_3d)
 284                 return;
 285
 286         vfpriv = file->driver_priv;
 287
 288         virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
 289         kfree(vfpriv);
 290         file->driver_priv = NULL;
 291 }