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 <linux/virtio_ring.h> 29 30 #include <drm/drm_file.h> 31 32 #include "virtgpu_drv.h" 33 34 static void virtio_gpu_config_changed_work_func(struct work_struct *work) 35 { 36 struct virtio_gpu_device *vgdev = 37 container_of(work, struct virtio_gpu_device, 38 config_changed_work); 39 u32 events_read, events_clear = 0; 40 41 /* read the config space */ 42 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 43 events_read, &events_read); 44 if (events_read & VIRTIO_GPU_EVENT_DISPLAY) { 45 if (vgdev->has_edid) 46 virtio_gpu_cmd_get_edids(vgdev); 47 virtio_gpu_cmd_get_display_info(vgdev); 48 virtio_gpu_notify(vgdev); 49 drm_helper_hpd_irq_event(vgdev->ddev); 50 events_clear |= VIRTIO_GPU_EVENT_DISPLAY; 51 } 52 virtio_cwrite(vgdev->vdev, struct virtio_gpu_config, 53 events_clear, &events_clear); 54 } 55 56 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev, 57 uint32_t ctx_id) 58 { 59 virtio_gpu_cmd_context_destroy(vgdev, ctx_id); 60 virtio_gpu_notify(vgdev); 61 ida_free(&vgdev->ctx_id_ida, ctx_id - 1); 62 } 63 64 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq, 65 void (*work_func)(struct work_struct *work)) 66 { 67 spin_lock_init(&vgvq->qlock); 68 init_waitqueue_head(&vgvq->ack_queue); 69 INIT_WORK(&vgvq->dequeue_work, work_func); 70 } 71 72 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev, 73 int num_capsets) 74 { 75 int i, ret; 76 77 vgdev->capsets = kcalloc(num_capsets, 78 sizeof(struct virtio_gpu_drv_capset), 79 GFP_KERNEL); 80 if (!vgdev->capsets) { 81 DRM_ERROR("failed to allocate cap sets\n"); 82 return; 83 } 84 for (i = 0; i < num_capsets; i++) { 85 virtio_gpu_cmd_get_capset_info(vgdev, i); 86 virtio_gpu_notify(vgdev); 87 ret = wait_event_timeout(vgdev->resp_wq, 88 vgdev->capsets[i].id > 0, 5 * HZ); 89 if (ret == 0) { 90 DRM_ERROR("timed out waiting for cap set %d\n", i); 91 kfree(vgdev->capsets); 92 vgdev->capsets = NULL; 93 return; 94 } 95 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n", 96 i, vgdev->capsets[i].id, 97 vgdev->capsets[i].max_version, 98 vgdev->capsets[i].max_size); 99 } 100 vgdev->num_capsets = num_capsets; 101 } 102 103 int virtio_gpu_init(struct drm_device *dev) 104 { 105 static vq_callback_t *callbacks[] = { 106 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack 107 }; 108 static const char * const names[] = { "control", "cursor" }; 109 110 struct virtio_gpu_device *vgdev; 111 /* this will expand later */ 112 struct virtqueue *vqs[2]; 113 u32 num_scanouts, num_capsets; 114 int ret; 115 116 if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1)) 117 return -ENODEV; 118 119 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL); 120 if (!vgdev) 121 return -ENOMEM; 122 123 vgdev->ddev = dev; 124 dev->dev_private = vgdev; 125 vgdev->vdev = dev_to_virtio(dev->dev); 126 vgdev->dev = dev->dev; 127 128 spin_lock_init(&vgdev->display_info_lock); 129 ida_init(&vgdev->ctx_id_ida); 130 ida_init(&vgdev->resource_ida); 131 init_waitqueue_head(&vgdev->resp_wq); 132 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func); 133 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func); 134 135 vgdev->fence_drv.context = dma_fence_context_alloc(1); 136 spin_lock_init(&vgdev->fence_drv.lock); 137 INIT_LIST_HEAD(&vgdev->fence_drv.fences); 138 INIT_LIST_HEAD(&vgdev->cap_cache); 139 INIT_WORK(&vgdev->config_changed_work, 140 virtio_gpu_config_changed_work_func); 141 142 INIT_WORK(&vgdev->obj_free_work, 143 virtio_gpu_array_put_free_work); 144 INIT_LIST_HEAD(&vgdev->obj_free_list); 145 spin_lock_init(&vgdev->obj_free_lock); 146 147 #ifdef __LITTLE_ENDIAN 148 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL)) 149 vgdev->has_virgl_3d = true; 150 #endif 151 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) { 152 vgdev->has_edid = true; 153 } 154 if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) { 155 vgdev->has_indirect = true; 156 } 157 158 DRM_INFO("features: %cvirgl %cedid\n", 159 vgdev->has_virgl_3d ? '+' : '-', 160 vgdev->has_edid ? '+' : '-'); 161 162 ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL); 163 if (ret) { 164 DRM_ERROR("failed to find virt queues\n"); 165 goto err_vqs; 166 } 167 vgdev->ctrlq.vq = vqs[0]; 168 vgdev->cursorq.vq = vqs[1]; 169 ret = virtio_gpu_alloc_vbufs(vgdev); 170 if (ret) { 171 DRM_ERROR("failed to alloc vbufs\n"); 172 goto err_vbufs; 173 } 174 175 /* get display info */ 176 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 177 num_scanouts, &num_scanouts); 178 vgdev->num_scanouts = min_t(uint32_t, num_scanouts, 179 VIRTIO_GPU_MAX_SCANOUTS); 180 if (!vgdev->num_scanouts) { 181 DRM_ERROR("num_scanouts is zero\n"); 182 ret = -EINVAL; 183 goto err_scanouts; 184 } 185 DRM_INFO("number of scanouts: %d\n", num_scanouts); 186 187 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 188 num_capsets, &num_capsets); 189 DRM_INFO("number of cap sets: %d\n", num_capsets); 190 191 virtio_gpu_modeset_init(vgdev); 192 193 virtio_device_ready(vgdev->vdev); 194 195 if (num_capsets) 196 virtio_gpu_get_capsets(vgdev, num_capsets); 197 if (vgdev->has_edid) 198 virtio_gpu_cmd_get_edids(vgdev); 199 virtio_gpu_cmd_get_display_info(vgdev); 200 virtio_gpu_notify(vgdev); 201 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending, 202 5 * HZ); 203 return 0; 204 205 err_scanouts: 206 virtio_gpu_free_vbufs(vgdev); 207 err_vbufs: 208 vgdev->vdev->config->del_vqs(vgdev->vdev); 209 err_vqs: 210 kfree(vgdev); 211 return ret; 212 } 213 214 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev) 215 { 216 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp; 217 218 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) { 219 kfree(cache_ent->caps_cache); 220 kfree(cache_ent); 221 } 222 } 223 224 void virtio_gpu_deinit(struct drm_device *dev) 225 { 226 struct virtio_gpu_device *vgdev = dev->dev_private; 227 228 flush_work(&vgdev->obj_free_work); 229 flush_work(&vgdev->ctrlq.dequeue_work); 230 flush_work(&vgdev->cursorq.dequeue_work); 231 flush_work(&vgdev->config_changed_work); 232 vgdev->vdev->config->reset(vgdev->vdev); 233 vgdev->vdev->config->del_vqs(vgdev->vdev); 234 } 235 236 void virtio_gpu_release(struct drm_device *dev) 237 { 238 struct virtio_gpu_device *vgdev = dev->dev_private; 239 240 virtio_gpu_modeset_fini(vgdev); 241 virtio_gpu_free_vbufs(vgdev); 242 virtio_gpu_cleanup_cap_cache(vgdev); 243 kfree(vgdev->capsets); 244 kfree(vgdev); 245 } 246 247 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file) 248 { 249 struct virtio_gpu_device *vgdev = dev->dev_private; 250 struct virtio_gpu_fpriv *vfpriv; 251 int handle; 252 253 /* can't create contexts without 3d renderer */ 254 if (!vgdev->has_virgl_3d) 255 return 0; 256 257 /* allocate a virt GPU context for this opener */ 258 vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL); 259 if (!vfpriv) 260 return -ENOMEM; 261 262 mutex_init(&vfpriv->context_lock); 263 264 handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL); 265 if (handle < 0) { 266 kfree(vfpriv); 267 return handle; 268 } 269 270 vfpriv->ctx_id = handle + 1; 271 file->driver_priv = vfpriv; 272 return 0; 273 } 274 275 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file) 276 { 277 struct virtio_gpu_device *vgdev = dev->dev_private; 278 struct virtio_gpu_fpriv *vfpriv; 279 280 if (!vgdev->has_virgl_3d) 281 return; 282 283 vfpriv = file->driver_priv; 284 285 virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id); 286 mutex_destroy(&vfpriv->context_lock); 287 kfree(vfpriv); 288 file->driver_priv = NULL; 289 } 290