virtgpu_kms.c revision 1.1.1.1
1 /* $NetBSD: virtgpu_kms.c,v 1.1.1.1 2018/08/27 01:34:59 riastradh Exp $ */ 2 3 /* 4 * Copyright (C) 2015 Red Hat, Inc. 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining 8 * a copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sublicense, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial 17 * portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 22 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 23 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 24 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: virtgpu_kms.c,v 1.1.1.1 2018/08/27 01:34:59 riastradh Exp $"); 30 31 #include <linux/virtio.h> 32 #include <linux/virtio_config.h> 33 #include <drm/drmP.h> 34 #include "virtgpu_drv.h" 35 36 static int virtio_gpu_fbdev = 1; 37 38 MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console"); 39 module_param_named(fbdev, virtio_gpu_fbdev, int, 0400); 40 41 static void virtio_gpu_config_changed_work_func(struct work_struct *work) 42 { 43 struct virtio_gpu_device *vgdev = 44 container_of(work, struct virtio_gpu_device, 45 config_changed_work); 46 u32 events_read, events_clear = 0; 47 48 /* read the config space */ 49 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 50 events_read, &events_read); 51 if (events_read & VIRTIO_GPU_EVENT_DISPLAY) { 52 virtio_gpu_cmd_get_display_info(vgdev); 53 drm_helper_hpd_irq_event(vgdev->ddev); 54 events_clear |= VIRTIO_GPU_EVENT_DISPLAY; 55 } 56 virtio_cwrite(vgdev->vdev, struct virtio_gpu_config, 57 events_clear, &events_clear); 58 } 59 60 static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev, 61 uint32_t *resid) 62 { 63 int handle; 64 65 idr_preload(GFP_KERNEL); 66 spin_lock(&vgdev->ctx_id_idr_lock); 67 handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0); 68 spin_unlock(&vgdev->ctx_id_idr_lock); 69 idr_preload_end(); 70 *resid = handle; 71 } 72 73 static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id) 74 { 75 spin_lock(&vgdev->ctx_id_idr_lock); 76 idr_remove(&vgdev->ctx_id_idr, id); 77 spin_unlock(&vgdev->ctx_id_idr_lock); 78 } 79 80 static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev, 81 uint32_t nlen, const char *name, 82 uint32_t *ctx_id) 83 { 84 virtio_gpu_ctx_id_get(vgdev, ctx_id); 85 virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name); 86 } 87 88 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev, 89 uint32_t ctx_id) 90 { 91 virtio_gpu_cmd_context_destroy(vgdev, ctx_id); 92 virtio_gpu_ctx_id_put(vgdev, ctx_id); 93 } 94 95 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq, 96 void (*work_func)(struct work_struct *work)) 97 { 98 spin_lock_init(&vgvq->qlock); 99 init_waitqueue_head(&vgvq->ack_queue); 100 INIT_WORK(&vgvq->dequeue_work, work_func); 101 } 102 103 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev, 104 int num_capsets) 105 { 106 int i, ret; 107 108 vgdev->capsets = kcalloc(num_capsets, 109 sizeof(struct virtio_gpu_drv_capset), 110 GFP_KERNEL); 111 if (!vgdev->capsets) { 112 DRM_ERROR("failed to allocate cap sets\n"); 113 return; 114 } 115 for (i = 0; i < num_capsets; i++) { 116 virtio_gpu_cmd_get_capset_info(vgdev, i); 117 ret = wait_event_timeout(vgdev->resp_wq, 118 vgdev->capsets[i].id > 0, 5 * HZ); 119 if (ret == 0) { 120 DRM_ERROR("timed out waiting for cap set %d\n", i); 121 kfree(vgdev->capsets); 122 vgdev->capsets = NULL; 123 return; 124 } 125 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n", 126 i, vgdev->capsets[i].id, 127 vgdev->capsets[i].max_version, 128 vgdev->capsets[i].max_size); 129 } 130 vgdev->num_capsets = num_capsets; 131 } 132 133 int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags) 134 { 135 static vq_callback_t *callbacks[] = { 136 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack 137 }; 138 static const char *names[] = { "control", "cursor" }; 139 140 struct virtio_gpu_device *vgdev; 141 /* this will expand later */ 142 struct virtqueue *vqs[2]; 143 u32 num_scanouts, num_capsets; 144 int ret; 145 146 if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1)) 147 return -ENODEV; 148 149 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL); 150 if (!vgdev) 151 return -ENOMEM; 152 153 vgdev->ddev = dev; 154 dev->dev_private = vgdev; 155 vgdev->vdev = dev->virtdev; 156 vgdev->dev = dev->dev; 157 158 spin_lock_init(&vgdev->display_info_lock); 159 spin_lock_init(&vgdev->ctx_id_idr_lock); 160 idr_init(&vgdev->ctx_id_idr); 161 spin_lock_init(&vgdev->resource_idr_lock); 162 idr_init(&vgdev->resource_idr); 163 init_waitqueue_head(&vgdev->resp_wq); 164 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func); 165 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func); 166 167 spin_lock_init(&vgdev->fence_drv.lock); 168 INIT_LIST_HEAD(&vgdev->fence_drv.fences); 169 INIT_LIST_HEAD(&vgdev->cap_cache); 170 INIT_WORK(&vgdev->config_changed_work, 171 virtio_gpu_config_changed_work_func); 172 173 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL)) 174 vgdev->has_virgl_3d = true; 175 DRM_INFO("virgl 3d acceleration %s\n", 176 vgdev->has_virgl_3d ? "enabled" : "not available"); 177 178 ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs, 179 callbacks, names); 180 if (ret) { 181 DRM_ERROR("failed to find virt queues\n"); 182 goto err_vqs; 183 } 184 vgdev->ctrlq.vq = vqs[0]; 185 vgdev->cursorq.vq = vqs[1]; 186 ret = virtio_gpu_alloc_vbufs(vgdev); 187 if (ret) { 188 DRM_ERROR("failed to alloc vbufs\n"); 189 goto err_vbufs; 190 } 191 192 ret = virtio_gpu_ttm_init(vgdev); 193 if (ret) { 194 DRM_ERROR("failed to init ttm %d\n", ret); 195 goto err_ttm; 196 } 197 198 /* get display info */ 199 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 200 num_scanouts, &num_scanouts); 201 vgdev->num_scanouts = min_t(uint32_t, num_scanouts, 202 VIRTIO_GPU_MAX_SCANOUTS); 203 if (!vgdev->num_scanouts) { 204 DRM_ERROR("num_scanouts is zero\n"); 205 ret = -EINVAL; 206 goto err_scanouts; 207 } 208 DRM_INFO("number of scanouts: %d\n", num_scanouts); 209 210 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 211 num_capsets, &num_capsets); 212 DRM_INFO("number of cap sets: %d\n", num_capsets); 213 214 ret = virtio_gpu_modeset_init(vgdev); 215 if (ret) 216 goto err_modeset; 217 218 virtio_device_ready(vgdev->vdev); 219 vgdev->vqs_ready = true; 220 221 if (num_capsets) 222 virtio_gpu_get_capsets(vgdev, num_capsets); 223 virtio_gpu_cmd_get_display_info(vgdev); 224 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending, 225 5 * HZ); 226 if (virtio_gpu_fbdev) 227 virtio_gpu_fbdev_init(vgdev); 228 229 return 0; 230 231 err_modeset: 232 err_scanouts: 233 virtio_gpu_ttm_fini(vgdev); 234 err_ttm: 235 virtio_gpu_free_vbufs(vgdev); 236 err_vbufs: 237 vgdev->vdev->config->del_vqs(vgdev->vdev); 238 err_vqs: 239 kfree(vgdev); 240 return ret; 241 } 242 243 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev) 244 { 245 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp; 246 247 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) { 248 kfree(cache_ent->caps_cache); 249 kfree(cache_ent); 250 } 251 } 252 253 int virtio_gpu_driver_unload(struct drm_device *dev) 254 { 255 struct virtio_gpu_device *vgdev = dev->dev_private; 256 257 vgdev->vqs_ready = false; 258 flush_work(&vgdev->ctrlq.dequeue_work); 259 flush_work(&vgdev->cursorq.dequeue_work); 260 flush_work(&vgdev->config_changed_work); 261 vgdev->vdev->config->del_vqs(vgdev->vdev); 262 263 virtio_gpu_modeset_fini(vgdev); 264 virtio_gpu_ttm_fini(vgdev); 265 virtio_gpu_free_vbufs(vgdev); 266 virtio_gpu_cleanup_cap_cache(vgdev); 267 kfree(vgdev->capsets); 268 kfree(vgdev); 269 return 0; 270 } 271 272 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file) 273 { 274 struct virtio_gpu_device *vgdev = dev->dev_private; 275 struct virtio_gpu_fpriv *vfpriv; 276 uint32_t id; 277 char dbgname[64], tmpname[TASK_COMM_LEN]; 278 279 /* can't create contexts without 3d renderer */ 280 if (!vgdev->has_virgl_3d) 281 return 0; 282 283 get_task_comm(tmpname, current); 284 snprintf(dbgname, sizeof(dbgname), "%s", tmpname); 285 dbgname[63] = 0; 286 /* allocate a virt GPU context for this opener */ 287 vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL); 288 if (!vfpriv) 289 return -ENOMEM; 290 291 virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id); 292 293 vfpriv->ctx_id = id; 294 file->driver_priv = vfpriv; 295 return 0; 296 } 297 298 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file) 299 { 300 struct virtio_gpu_device *vgdev = dev->dev_private; 301 struct virtio_gpu_fpriv *vfpriv; 302 303 if (!vgdev->has_virgl_3d) 304 return; 305 306 vfpriv = file->driver_priv; 307 308 virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id); 309 kfree(vfpriv); 310 file->driver_priv = NULL; 311 } 312
Indexes created Mon Oct 13 08:09:50 GMT 2025