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