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 int virtio_gpu_context_create(struct virtio_gpu_device *vgdev, 56 uint32_t nlen, const char *name) 57 { 58 int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL); 59 60 if (handle < 0) 61 return handle; 62 handle += 1; 63 virtio_gpu_cmd_context_create(vgdev, handle, nlen, name); 64 return handle; 65 } 66 67 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev, 68 uint32_t ctx_id) 69 { 70 virtio_gpu_cmd_context_destroy(vgdev, ctx_id); 71 ida_free(&vgdev->ctx_id_ida, ctx_id - 1); 72 } 73 74 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq, 75 void (*work_func)(struct work_struct *work)) 76 { 77 spin_lock_init(&vgvq->qlock); 78 init_waitqueue_head(&vgvq->ack_queue); 79 INIT_WORK(&vgvq->dequeue_work, work_func); 80 } 81 82 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev, 83 int num_capsets) 84 { 85 int i, ret; 86 87 vgdev->capsets = kcalloc(num_capsets, 88 sizeof(struct virtio_gpu_drv_capset), 89 GFP_KERNEL); 90 if (!vgdev->capsets) { 91 DRM_ERROR("failed to allocate cap sets\n"); 92 return; 93 } 94 for (i = 0; i < num_capsets; i++) { 95 virtio_gpu_cmd_get_capset_info(vgdev, i); 96 ret = wait_event_timeout(vgdev->resp_wq, 97 vgdev->capsets[i].id > 0, 5 * HZ); 98 if (ret == 0) { 99 DRM_ERROR("timed out waiting for cap set %d\n", i); 100 kfree(vgdev->capsets); 101 vgdev->capsets = NULL; 102 return; 103 } 104 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n", 105 i, vgdev->capsets[i].id, 106 vgdev->capsets[i].max_version, 107 vgdev->capsets[i].max_size); 108 } 109 vgdev->num_capsets = num_capsets; 110 } 111 112 int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags) 113 { 114 static vq_callback_t *callbacks[] = { 115 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack 116 }; 117 static const char * const names[] = { "control", "cursor" }; 118 119 struct virtio_gpu_device *vgdev; 120 /* this will expand later */ 121 struct virtqueue *vqs[2]; 122 u32 num_scanouts, num_capsets; 123 int ret; 124 125 if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1)) 126 return -ENODEV; 127 128 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL); 129 if (!vgdev) 130 return -ENOMEM; 131 132 vgdev->ddev = dev; 133 dev->dev_private = vgdev; 134 vgdev->vdev = dev_to_virtio(dev->dev); 135 vgdev->dev = dev->dev; 136 137 spin_lock_init(&vgdev->display_info_lock); 138 ida_init(&vgdev->ctx_id_ida); 139 ida_init(&vgdev->resource_ida); 140 init_waitqueue_head(&vgdev->resp_wq); 141 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func); 142 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func); 143 144 vgdev->fence_drv.context = dma_fence_context_alloc(1); 145 spin_lock_init(&vgdev->fence_drv.lock); 146 INIT_LIST_HEAD(&vgdev->fence_drv.fences); 147 INIT_LIST_HEAD(&vgdev->cap_cache); 148 INIT_WORK(&vgdev->config_changed_work, 149 virtio_gpu_config_changed_work_func); 150 151 #ifdef __LITTLE_ENDIAN 152 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL)) 153 vgdev->has_virgl_3d = true; 154 DRM_INFO("virgl 3d acceleration %s\n", 155 vgdev->has_virgl_3d ? "enabled" : "not supported by host"); 156 #else 157 DRM_INFO("virgl 3d acceleration not supported by guest\n"); 158 #endif 159 160 ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL); 161 if (ret) { 162 DRM_ERROR("failed to find virt queues\n"); 163 goto err_vqs; 164 } 165 vgdev->ctrlq.vq = vqs[0]; 166 vgdev->cursorq.vq = vqs[1]; 167 ret = virtio_gpu_alloc_vbufs(vgdev); 168 if (ret) { 169 DRM_ERROR("failed to alloc vbufs\n"); 170 goto err_vbufs; 171 } 172 173 ret = virtio_gpu_ttm_init(vgdev); 174 if (ret) { 175 DRM_ERROR("failed to init ttm %d\n", ret); 176 goto err_ttm; 177 } 178 179 /* get display info */ 180 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 181 num_scanouts, &num_scanouts); 182 vgdev->num_scanouts = min_t(uint32_t, num_scanouts, 183 VIRTIO_GPU_MAX_SCANOUTS); 184 if (!vgdev->num_scanouts) { 185 DRM_ERROR("num_scanouts is zero\n"); 186 ret = -EINVAL; 187 goto err_scanouts; 188 } 189 DRM_INFO("number of scanouts: %d\n", num_scanouts); 190 191 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 192 num_capsets, &num_capsets); 193 DRM_INFO("number of cap sets: %d\n", num_capsets); 194 195 ret = virtio_gpu_modeset_init(vgdev); 196 if (ret) 197 goto err_modeset; 198 199 virtio_device_ready(vgdev->vdev); 200 vgdev->vqs_ready = true; 201 202 if (num_capsets) 203 virtio_gpu_get_capsets(vgdev, num_capsets); 204 virtio_gpu_cmd_get_display_info(vgdev); 205 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending, 206 5 * HZ); 207 if (virtio_gpu_fbdev) 208 virtio_gpu_fbdev_init(vgdev); 209 210 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