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 } 294