root/drivers/gpu/drm/virtio/virtgpu_kms.c

DEFINITIONS

1. virtio_gpu_config_changed_work_func
2. virtio_gpu_context_create
3. virtio_gpu_context_destroy
4. virtio_gpu_init_vq
5. virtio_gpu_get_capsets
6. virtio_gpu_init
7. virtio_gpu_cleanup_cap_cache
8. virtio_gpu_deinit
9. virtio_gpu_driver_open
10. virtio_gpu_driver_postclose

   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 
  29 #include <drm/drm_file.h>
  30 
  31 #include "virtgpu_drv.h"
  32 
  33 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
  34 {
  35         struct virtio_gpu_device *vgdev =
  36                 container_of(work, struct virtio_gpu_device,
  37                              config_changed_work);
  38         u32 events_read, events_clear = 0;
  39 
  40         /* read the config space */
  41         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
  42                      events_read, &events_read);
  43         if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
  44                 if (vgdev->has_edid)
  45                         virtio_gpu_cmd_get_edids(vgdev);
  46                 virtio_gpu_cmd_get_display_info(vgdev);
  47                 drm_helper_hpd_irq_event(vgdev->ddev);
  48                 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
  49         }
  50         virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
  51                       events_clear, &events_clear);
  52 }
  53 
  54 static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
  55                                       uint32_t nlen, const char *name)
  56 {
  57         int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
  58 
  59         if (handle < 0)
  60                 return handle;
  61         handle += 1;
  62         virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
  63         return handle;
  64 }
  65 
  66 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
  67                                       uint32_t ctx_id)
  68 {
  69         virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
  70         ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
  71 }
  72 
  73 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
  74                                void (*work_func)(struct work_struct *work))
  75 {
  76         spin_lock_init(&vgvq->qlock);
  77         init_waitqueue_head(&vgvq->ack_queue);
  78         INIT_WORK(&vgvq->dequeue_work, work_func);
  79 }
  80 
  81 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
  82                                    int num_capsets)
  83 {
  84         int i, ret;
  85 
  86         vgdev->capsets = kcalloc(num_capsets,
  87                                  sizeof(struct virtio_gpu_drv_capset),
  88                                  GFP_KERNEL);
  89         if (!vgdev->capsets) {
  90                 DRM_ERROR("failed to allocate cap sets\n");
  91                 return;
  92         }
  93         for (i = 0; i < num_capsets; i++) {
  94                 virtio_gpu_cmd_get_capset_info(vgdev, i);
  95                 ret = wait_event_timeout(vgdev->resp_wq,
  96                                          vgdev->capsets[i].id > 0, 5 * HZ);
  97                 if (ret == 0) {
  98                         DRM_ERROR("timed out waiting for cap set %d\n", i);
  99                         kfree(vgdev->capsets);
 100                         vgdev->capsets = NULL;
 101                         return;
 102                 }
 103                 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
 104                          i, vgdev->capsets[i].id,
 105                          vgdev->capsets[i].max_version,
 106                          vgdev->capsets[i].max_size);
 107         }
 108         vgdev->num_capsets = num_capsets;
 109 }
 110 
 111 int virtio_gpu_init(struct drm_device *dev)
 112 {
 113         static vq_callback_t *callbacks[] = {
 114                 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
 115         };
 116         static const char * const names[] = { "control", "cursor" };
 117 
 118         struct virtio_gpu_device *vgdev;
 119         /* this will expand later */
 120         struct virtqueue *vqs[2];
 121         u32 num_scanouts, num_capsets;
 122         int ret;
 123 
 124         if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
 125                 return -ENODEV;
 126 
 127         vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
 128         if (!vgdev)
 129                 return -ENOMEM;
 130 
 131         vgdev->ddev = dev;
 132         dev->dev_private = vgdev;
 133         vgdev->vdev = dev_to_virtio(dev->dev);
 134         vgdev->dev = dev->dev;
 135 
 136         spin_lock_init(&vgdev->display_info_lock);
 137         ida_init(&vgdev->ctx_id_ida);
 138         ida_init(&vgdev->resource_ida);
 139         init_waitqueue_head(&vgdev->resp_wq);
 140         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 141         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 142 
 143         vgdev->fence_drv.context = dma_fence_context_alloc(1);
 144         spin_lock_init(&vgdev->fence_drv.lock);
 145         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 146         INIT_LIST_HEAD(&vgdev->cap_cache);
 147         INIT_WORK(&vgdev->config_changed_work,
 148                   virtio_gpu_config_changed_work_func);
 149 
 150 #ifdef __LITTLE_ENDIAN
 151         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
 152                 vgdev->has_virgl_3d = true;
 153         DRM_INFO("virgl 3d acceleration %s\n",
 154                  vgdev->has_virgl_3d ? "enabled" : "not supported by host");
 155 #else
 156         DRM_INFO("virgl 3d acceleration not supported by guest\n");
 157 #endif
 158         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
 159                 vgdev->has_edid = true;
 160                 DRM_INFO("EDID support available.\n");
 161         }
 162 
 163         ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
 164         if (ret) {
 165                 DRM_ERROR("failed to find virt queues\n");
 166                 goto err_vqs;
 167         }
 168         vgdev->ctrlq.vq = vqs[0];
 169         vgdev->cursorq.vq = vqs[1];
 170         ret = virtio_gpu_alloc_vbufs(vgdev);
 171         if (ret) {
 172                 DRM_ERROR("failed to alloc vbufs\n");
 173                 goto err_vbufs;
 174         }
 175 
 176         ret = virtio_gpu_ttm_init(vgdev);
 177         if (ret) {
 178                 DRM_ERROR("failed to init ttm %d\n", ret);
 179                 goto err_ttm;
 180         }
 181 
 182         /* get display info */
 183         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 184                      num_scanouts, &num_scanouts);
 185         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
 186                                     VIRTIO_GPU_MAX_SCANOUTS);
 187         if (!vgdev->num_scanouts) {
 188                 DRM_ERROR("num_scanouts is zero\n");
 189                 ret = -EINVAL;
 190                 goto err_scanouts;
 191         }
 192         DRM_INFO("number of scanouts: %d\n", num_scanouts);
 193 
 194         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 195                      num_capsets, &num_capsets);
 196         DRM_INFO("number of cap sets: %d\n", num_capsets);
 197 
 198         virtio_gpu_modeset_init(vgdev);
 199 
 200         virtio_device_ready(vgdev->vdev);
 201         vgdev->vqs_ready = true;
 202 
 203         if (num_capsets)
 204                 virtio_gpu_get_capsets(vgdev, num_capsets);
 205         if (vgdev->has_edid)
 206                 virtio_gpu_cmd_get_edids(vgdev);
 207         virtio_gpu_cmd_get_display_info(vgdev);
 208         wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 209                            5 * HZ);
 210         return 0;
 211 
 212 err_scanouts:
 213         virtio_gpu_ttm_fini(vgdev);
 214 err_ttm:
 215         virtio_gpu_free_vbufs(vgdev);
 216 err_vbufs:
 217         vgdev->vdev->config->del_vqs(vgdev->vdev);
 218 err_vqs:
 219         kfree(vgdev);
 220         return ret;
 221 }
 222 
 223 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
 224 {
 225         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
 226 
 227         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
 228                 kfree(cache_ent->caps_cache);
 229                 kfree(cache_ent);
 230         }
 231 }
 232 
 233 void virtio_gpu_deinit(struct drm_device *dev)
 234 {
 235         struct virtio_gpu_device *vgdev = dev->dev_private;
 236 
 237         vgdev->vqs_ready = false;
 238         flush_work(&vgdev->ctrlq.dequeue_work);
 239         flush_work(&vgdev->cursorq.dequeue_work);
 240         flush_work(&vgdev->config_changed_work);
 241         vgdev->vdev->config->reset(vgdev->vdev);
 242         vgdev->vdev->config->del_vqs(vgdev->vdev);
 243 
 244         virtio_gpu_modeset_fini(vgdev);
 245         virtio_gpu_ttm_fini(vgdev);
 246         virtio_gpu_free_vbufs(vgdev);
 247         virtio_gpu_cleanup_cap_cache(vgdev);
 248         kfree(vgdev->capsets);
 249         kfree(vgdev);
 250 }
 251 
 252 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 253 {
 254         struct virtio_gpu_device *vgdev = dev->dev_private;
 255         struct virtio_gpu_fpriv *vfpriv;
 256         int id;
 257         char dbgname[TASK_COMM_LEN];
 258 
 259         /* can't create contexts without 3d renderer */
 260         if (!vgdev->has_virgl_3d)
 261                 return 0;
 262 
 263         /* allocate a virt GPU context for this opener */
 264         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
 265         if (!vfpriv)
 266                 return -ENOMEM;
 267 
 268         get_task_comm(dbgname, current);
 269         id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
 270         if (id < 0) {
 271                 kfree(vfpriv);
 272                 return id;
 273         }
 274 
 275         vfpriv->ctx_id = id;
 276         file->driver_priv = vfpriv;
 277         return 0;
 278 }
 279 
 280 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 281 {
 282         struct virtio_gpu_device *vgdev = dev->dev_private;
 283         struct virtio_gpu_fpriv *vfpriv;
 284 
 285         if (!vgdev->has_virgl_3d)
 286                 return;
 287 
 288         vfpriv = file->driver_priv;
 289 
 290         virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
 291         kfree(vfpriv);
 292         file->driver_priv = NULL;
 293 }