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