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_driver_load(struct drm_device *dev, unsigned long flags) 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 ret = virtio_gpu_modeset_init(vgdev); 197 if (ret) 198 goto err_modeset; 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_modeset: 213 err_scanouts: 214 virtio_gpu_ttm_fini(vgdev); 215 err_ttm: 216 virtio_gpu_free_vbufs(vgdev); 217 err_vbufs: 218 vgdev->vdev->config->del_vqs(vgdev->vdev); 219 err_vqs: 220 kfree(vgdev); 221 return ret; 222 } 223 224 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev) 225 { 226 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp; 227 228 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) { 229 kfree(cache_ent->caps_cache); 230 kfree(cache_ent); 231 } 232 } 233 234 void virtio_gpu_driver_unload(struct drm_device *dev) 235 { 236 struct virtio_gpu_device *vgdev = dev->dev_private; 237 238 vgdev->vqs_ready = false; 239 flush_work(&vgdev->ctrlq.dequeue_work); 240 flush_work(&vgdev->cursorq.dequeue_work); 241 flush_work(&vgdev->config_changed_work); 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