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 int virtio_gpu_fbdev = 1;
  32
  33 MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
  34 module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);
  35
  36 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
  37 {
  38         struct virtio_gpu_device *vgdev =
  39                 container_of(work, struct virtio_gpu_device,
  40                              config_changed_work);
  41         u32 events_read, events_clear = 0;
  42
  43         /* read the config space */
  44         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
  45                      events_read, &events_read);
  46         if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
  47                 virtio_gpu_cmd_get_display_info(vgdev);
  48                 drm_helper_hpd_irq_event(vgdev->ddev);
  49                 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
  50         }
  51         virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
  52                       events_clear, &events_clear);
  53 }
  54
  55 static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
  56                                   uint32_t *resid)
  57 {
  58         int handle;
  59
  60         idr_preload(GFP_KERNEL);
  61         spin_lock(&vgdev->ctx_id_idr_lock);
  62         handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0);
  63         spin_unlock(&vgdev->ctx_id_idr_lock);
  64         idr_preload_end();
  65         *resid = handle;
  66 }
  67
  68 static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  69 {
  70         spin_lock(&vgdev->ctx_id_idr_lock);
  71         idr_remove(&vgdev->ctx_id_idr, id);
  72         spin_unlock(&vgdev->ctx_id_idr_lock);
  73 }
  74
  75 static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
  76                                       uint32_t nlen, const char *name,
  77                                       uint32_t *ctx_id)
  78 {
  79         virtio_gpu_ctx_id_get(vgdev, ctx_id);
  80         virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name);
  81 }
  82
  83 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
  84                                       uint32_t ctx_id)
  85 {
  86         virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
  87         virtio_gpu_ctx_id_put(vgdev, ctx_id);
  88 }
  89
  90 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
  91                                void (*work_func)(struct work_struct *work))
  92 {
  93         spin_lock_init(&vgvq->qlock);
  94         init_waitqueue_head(&vgvq->ack_queue);
  95         INIT_WORK(&vgvq->dequeue_work, work_func);
  96 }
  97
  98 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
  99                                    int num_capsets)
 100 {
 101         int i, ret;
 102
 103         vgdev->capsets = kcalloc(num_capsets,
 104                                  sizeof(struct virtio_gpu_drv_capset),
 105                                  GFP_KERNEL);
 106         if (!vgdev->capsets) {
 107                 DRM_ERROR("failed to allocate cap sets\n");
 108                 return;
 109         }
 110         for (i = 0; i < num_capsets; i++) {
 111                 virtio_gpu_cmd_get_capset_info(vgdev, i);
 112                 ret = wait_event_timeout(vgdev->resp_wq,
 113                                          vgdev->capsets[i].id > 0, 5 * HZ);
 114                 if (ret == 0) {
 115                         DRM_ERROR("timed out waiting for cap set %d\n", i);
 116                         kfree(vgdev->capsets);
 117                         vgdev->capsets = NULL;
 118                         return;
 119                 }
 120                 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
 121                          i, vgdev->capsets[i].id,
 122                          vgdev->capsets[i].max_version,
 123                          vgdev->capsets[i].max_size);
 124         }
 125         vgdev->num_capsets = num_capsets;
 126 }
 127
 128 int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
 129 {
 130         static vq_callback_t *callbacks[] = {
 131                 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
 132         };
 133         static const char * const names[] = { "control", "cursor" };
 134
 135         struct virtio_gpu_device *vgdev;
 136         /* this will expand later */
 137         struct virtqueue *vqs[2];
 138         u32 num_scanouts, num_capsets;
 139         int ret;
 140
 141         if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1))
 142                 return -ENODEV;
 143
 144         vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
 145         if (!vgdev)
 146                 return -ENOMEM;
 147
 148         vgdev->ddev = dev;
 149         dev->dev_private = vgdev;
 150         vgdev->vdev = dev->virtdev;
 151         vgdev->dev = dev->dev;
 152
 153         spin_lock_init(&vgdev->display_info_lock);
 154         spin_lock_init(&vgdev->ctx_id_idr_lock);
 155         idr_init(&vgdev->ctx_id_idr);
 156         spin_lock_init(&vgdev->resource_idr_lock);
 157         idr_init(&vgdev->resource_idr);
 158         init_waitqueue_head(&vgdev->resp_wq);
 159         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 160         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 161
 162         spin_lock_init(&vgdev->fence_drv.lock);
 163         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 164         INIT_LIST_HEAD(&vgdev->cap_cache);
 165         INIT_WORK(&vgdev->config_changed_work,
 166                   virtio_gpu_config_changed_work_func);
 167
 168         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
 169                 vgdev->has_virgl_3d = true;
 170         DRM_INFO("virgl 3d acceleration %s\n",
 171                  vgdev->has_virgl_3d ? "enabled" : "not available");
 172
 173         ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
 174                                             callbacks, names);
 175         if (ret) {
 176                 DRM_ERROR("failed to find virt queues\n");
 177                 goto err_vqs;
 178         }
 179         vgdev->ctrlq.vq = vqs[0];
 180         vgdev->cursorq.vq = vqs[1];
 181         ret = virtio_gpu_alloc_vbufs(vgdev);
 182         if (ret) {
 183                 DRM_ERROR("failed to alloc vbufs\n");
 184                 goto err_vbufs;
 185         }
 186
 187         ret = virtio_gpu_ttm_init(vgdev);
 188         if (ret) {
 189                 DRM_ERROR("failed to init ttm %d\n", ret);
 190                 goto err_ttm;
 191         }
 192
 193         /* get display info */
 194         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 195                      num_scanouts, &num_scanouts);
 196         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
 197                                     VIRTIO_GPU_MAX_SCANOUTS);
 198         if (!vgdev->num_scanouts) {
 199                 DRM_ERROR("num_scanouts is zero\n");
 200                 ret = -EINVAL;
 201                 goto err_scanouts;
 202         }
 203         DRM_INFO("number of scanouts: %d\n", num_scanouts);
 204
 205         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 206                      num_capsets, &num_capsets);
 207         DRM_INFO("number of cap sets: %d\n", num_capsets);
 208
 209         ret = virtio_gpu_modeset_init(vgdev);
 210         if (ret)
 211                 goto err_modeset;
 212
 213         virtio_device_ready(vgdev->vdev);
 214         vgdev->vqs_ready = true;
 215
 216         if (num_capsets)
 217                 virtio_gpu_get_capsets(vgdev, num_capsets);
 218         virtio_gpu_cmd_get_display_info(vgdev);
 219         wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 220                            5 * HZ);
 221         if (virtio_gpu_fbdev)
 222                 virtio_gpu_fbdev_init(vgdev);
 223
 224         return 0;
 225
 226 err_modeset:
 227 err_scanouts:
 228         virtio_gpu_ttm_fini(vgdev);
 229 err_ttm:
 230         virtio_gpu_free_vbufs(vgdev);
 231 err_vbufs:
 232         vgdev->vdev->config->del_vqs(vgdev->vdev);
 233 err_vqs:
 234         kfree(vgdev);
 235         return ret;
 236 }
 237
 238 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
 239 {
 240         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
 241
 242         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
 243                 kfree(cache_ent->caps_cache);
 244                 kfree(cache_ent);
 245         }
 246 }
 247
 248 int virtio_gpu_driver_unload(struct drm_device *dev)
 249 {
 250         struct virtio_gpu_device *vgdev = dev->dev_private;
 251
 252         vgdev->vqs_ready = false;
 253         flush_work(&vgdev->ctrlq.dequeue_work);
 254         flush_work(&vgdev->cursorq.dequeue_work);
 255         flush_work(&vgdev->config_changed_work);
 256         vgdev->vdev->config->del_vqs(vgdev->vdev);
 257
 258         virtio_gpu_modeset_fini(vgdev);
 259         virtio_gpu_ttm_fini(vgdev);
 260         virtio_gpu_free_vbufs(vgdev);
 261         virtio_gpu_cleanup_cap_cache(vgdev);
 262         kfree(vgdev->capsets);
 263         kfree(vgdev);
 264         return 0;
 265 }
 266
 267 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 268 {
 269         struct virtio_gpu_device *vgdev = dev->dev_private;
 270         struct virtio_gpu_fpriv *vfpriv;
 271         uint32_t id;
 272         char dbgname[64], tmpname[TASK_COMM_LEN];
 273
 274         /* can't create contexts without 3d renderer */
 275         if (!vgdev->has_virgl_3d)
 276                 return 0;
 277
 278         get_task_comm(tmpname, current);
 279         snprintf(dbgname, sizeof(dbgname), "%s", tmpname);
 280         dbgname[63] = 0;
 281         /* allocate a virt GPU context for this opener */
 282         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
 283         if (!vfpriv)
 284                 return -ENOMEM;
 285
 286         virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id);
 287
 288         vfpriv->ctx_id = id;
 289         file->driver_priv = vfpriv;
 290         return 0;
 291 }
 292
 293 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 294 {
 295         struct virtio_gpu_device *vgdev = dev->dev_private;
 296         struct virtio_gpu_fpriv *vfpriv;
 297
 298         if (!vgdev->has_virgl_3d)
 299                 return;
 300
 301         vfpriv = file->driver_priv;
 302
 303         virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
 304         kfree(vfpriv);
 305         file->driver_priv = NULL;
 306 }