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1/*
2 * Copyright (C) 2015 Red Hat, Inc.
3 * All Rights Reserved.
4 *
5 * Authors:
6 * Dave Airlie
7 * Alon Levy
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28#include <linux/file.h>
29#include <linux/sync_file.h>
30#include <linux/uaccess.h>
31
32#include <drm/drm_file.h>
33#include <drm/virtgpu_drm.h>
34
35#include "virtgpu_drv.h"
36
37void virtio_gpu_create_context(struct drm_device *dev, struct drm_file *file)
38{
39 struct virtio_gpu_device *vgdev = dev->dev_private;
40 struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
41 char dbgname[TASK_COMM_LEN];
42
43 mutex_lock(&vfpriv->context_lock);
44 if (vfpriv->context_created)
45 goto out_unlock;
46
47 get_task_comm(dbgname, current);
48 virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
49 strlen(dbgname), dbgname);
50 vfpriv->context_created = true;
51
52out_unlock:
53 mutex_unlock(&vfpriv->context_lock);
54}
55
56static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
57 struct drm_file *file)
58{
59 struct virtio_gpu_device *vgdev = dev->dev_private;
60 struct drm_virtgpu_map *virtio_gpu_map = data;
61
62 return virtio_gpu_mode_dumb_mmap(file, vgdev->ddev,
63 virtio_gpu_map->handle,
64 &virtio_gpu_map->offset);
65}
66
67/*
68 * Usage of execbuffer:
69 * Relocations need to take into account the full VIRTIO_GPUDrawable size.
70 * However, the command as passed from user space must *not* contain the initial
71 * VIRTIO_GPUReleaseInfo struct (first XXX bytes)
72 */
73static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
74 struct drm_file *file)
75{
76 struct drm_virtgpu_execbuffer *exbuf = data;
77 struct virtio_gpu_device *vgdev = dev->dev_private;
78 struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
79 struct virtio_gpu_fence *out_fence;
80 int ret;
81 uint32_t *bo_handles = NULL;
82 void __user *user_bo_handles = NULL;
83 struct virtio_gpu_object_array *buflist = NULL;
84 struct sync_file *sync_file;
85 int in_fence_fd = exbuf->fence_fd;
86 int out_fence_fd = -1;
87 void *buf;
88
89 if (vgdev->has_virgl_3d == false)
90 return -ENOSYS;
91
92 if ((exbuf->flags & ~VIRTGPU_EXECBUF_FLAGS))
93 return -EINVAL;
94
95 exbuf->fence_fd = -1;
96
97 virtio_gpu_create_context(dev, file);
98 if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
99 struct dma_fence *in_fence;
100
101 in_fence = sync_file_get_fence(in_fence_fd);
102
103 if (!in_fence)
104 return -EINVAL;
105
106 /*
107 * Wait if the fence is from a foreign context, or if the fence
108 * array contains any fence from a foreign context.
109 */
110 ret = 0;
111 if (!dma_fence_match_context(in_fence, vgdev->fence_drv.context))
112 ret = dma_fence_wait(in_fence, true);
113
114 dma_fence_put(in_fence);
115 if (ret)
116 return ret;
117 }
118
119 if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_OUT) {
120 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
121 if (out_fence_fd < 0)
122 return out_fence_fd;
123 }
124
125 if (exbuf->num_bo_handles) {
126 bo_handles = kvmalloc_array(exbuf->num_bo_handles,
127 sizeof(uint32_t), GFP_KERNEL);
128 if (!bo_handles) {
129 ret = -ENOMEM;
130 goto out_unused_fd;
131 }
132
133 user_bo_handles = u64_to_user_ptr(exbuf->bo_handles);
134 if (copy_from_user(bo_handles, user_bo_handles,
135 exbuf->num_bo_handles * sizeof(uint32_t))) {
136 ret = -EFAULT;
137 goto out_unused_fd;
138 }
139
140 buflist = virtio_gpu_array_from_handles(file, bo_handles,
141 exbuf->num_bo_handles);
142 if (!buflist) {
143 ret = -ENOENT;
144 goto out_unused_fd;
145 }
146 kvfree(bo_handles);
147 bo_handles = NULL;
148 }
149
150 buf = vmemdup_user(u64_to_user_ptr(exbuf->command), exbuf->size);
151 if (IS_ERR(buf)) {
152 ret = PTR_ERR(buf);
153 goto out_unused_fd;
154 }
155
156 if (buflist) {
157 ret = virtio_gpu_array_lock_resv(buflist);
158 if (ret)
159 goto out_memdup;
160 }
161
162 out_fence = virtio_gpu_fence_alloc(vgdev);
163 if(!out_fence) {
164 ret = -ENOMEM;
165 goto out_unresv;
166 }
167
168 if (out_fence_fd >= 0) {
169 sync_file = sync_file_create(&out_fence->f);
170 if (!sync_file) {
171 dma_fence_put(&out_fence->f);
172 ret = -ENOMEM;
173 goto out_memdup;
174 }
175
176 exbuf->fence_fd = out_fence_fd;
177 fd_install(out_fence_fd, sync_file->file);
178 }
179
180 virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
181 vfpriv->ctx_id, buflist, out_fence);
182 dma_fence_put(&out_fence->f);
183 virtio_gpu_notify(vgdev);
184 return 0;
185
186out_unresv:
187 if (buflist)
188 virtio_gpu_array_unlock_resv(buflist);
189out_memdup:
190 kvfree(buf);
191out_unused_fd:
192 kvfree(bo_handles);
193 if (buflist)
194 virtio_gpu_array_put_free(buflist);
195
196 if (out_fence_fd >= 0)
197 put_unused_fd(out_fence_fd);
198
199 return ret;
200}
201
202static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
203 struct drm_file *file)
204{
205 struct virtio_gpu_device *vgdev = dev->dev_private;
206 struct drm_virtgpu_getparam *param = data;
207 int value;
208
209 switch (param->param) {
210 case VIRTGPU_PARAM_3D_FEATURES:
211 value = vgdev->has_virgl_3d == true ? 1 : 0;
212 break;
213 case VIRTGPU_PARAM_CAPSET_QUERY_FIX:
214 value = 1;
215 break;
216 default:
217 return -EINVAL;
218 }
219 if (copy_to_user(u64_to_user_ptr(param->value), &value, sizeof(int)))
220 return -EFAULT;
221
222 return 0;
223}
224
225static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
226 struct drm_file *file)
227{
228 struct virtio_gpu_device *vgdev = dev->dev_private;
229 struct drm_virtgpu_resource_create *rc = data;
230 struct virtio_gpu_fence *fence;
231 int ret;
232 struct virtio_gpu_object *qobj;
233 struct drm_gem_object *obj;
234 uint32_t handle = 0;
235 struct virtio_gpu_object_params params = { 0 };
236
237 if (vgdev->has_virgl_3d) {
238 virtio_gpu_create_context(dev, file);
239 params.virgl = true;
240 params.target = rc->target;
241 params.bind = rc->bind;
242 params.depth = rc->depth;
243 params.array_size = rc->array_size;
244 params.last_level = rc->last_level;
245 params.nr_samples = rc->nr_samples;
246 params.flags = rc->flags;
247 } else {
248 if (rc->depth > 1)
249 return -EINVAL;
250 if (rc->nr_samples > 1)
251 return -EINVAL;
252 if (rc->last_level > 1)
253 return -EINVAL;
254 if (rc->target != 2)
255 return -EINVAL;
256 if (rc->array_size > 1)
257 return -EINVAL;
258 }
259
260 params.format = rc->format;
261 params.width = rc->width;
262 params.height = rc->height;
263 params.size = rc->size;
264 /* allocate a single page size object */
265 if (params.size == 0)
266 params.size = PAGE_SIZE;
267
268 fence = virtio_gpu_fence_alloc(vgdev);
269 if (!fence)
270 return -ENOMEM;
271 ret = virtio_gpu_object_create(vgdev, ¶ms, &qobj, fence);
272 dma_fence_put(&fence->f);
273 if (ret < 0)
274 return ret;
275 obj = &qobj->base.base;
276
277 ret = drm_gem_handle_create(file, obj, &handle);
278 if (ret) {
279 drm_gem_object_release(obj);
280 return ret;
281 }
282 drm_gem_object_put(obj);
283
284 rc->res_handle = qobj->hw_res_handle; /* similiar to a VM address */
285 rc->bo_handle = handle;
286 return 0;
287}
288
289static int virtio_gpu_resource_info_ioctl(struct drm_device *dev, void *data,
290 struct drm_file *file)
291{
292 struct drm_virtgpu_resource_info *ri = data;
293 struct drm_gem_object *gobj = NULL;
294 struct virtio_gpu_object *qobj = NULL;
295
296 gobj = drm_gem_object_lookup(file, ri->bo_handle);
297 if (gobj == NULL)
298 return -ENOENT;
299
300 qobj = gem_to_virtio_gpu_obj(gobj);
301
302 ri->size = qobj->base.base.size;
303 ri->res_handle = qobj->hw_res_handle;
304 drm_gem_object_put(gobj);
305 return 0;
306}
307
308static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
309 void *data,
310 struct drm_file *file)
311{
312 struct virtio_gpu_device *vgdev = dev->dev_private;
313 struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
314 struct drm_virtgpu_3d_transfer_from_host *args = data;
315 struct virtio_gpu_object_array *objs;
316 struct virtio_gpu_fence *fence;
317 int ret;
318 u32 offset = args->offset;
319
320 if (vgdev->has_virgl_3d == false)
321 return -ENOSYS;
322
323 virtio_gpu_create_context(dev, file);
324 objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
325 if (objs == NULL)
326 return -ENOENT;
327
328 ret = virtio_gpu_array_lock_resv(objs);
329 if (ret != 0)
330 goto err_put_free;
331
332 fence = virtio_gpu_fence_alloc(vgdev);
333 if (!fence) {
334 ret = -ENOMEM;
335 goto err_unlock;
336 }
337 virtio_gpu_cmd_transfer_from_host_3d
338 (vgdev, vfpriv->ctx_id, offset, args->level,
339 &args->box, objs, fence);
340 dma_fence_put(&fence->f);
341 virtio_gpu_notify(vgdev);
342 return 0;
343
344err_unlock:
345 virtio_gpu_array_unlock_resv(objs);
346err_put_free:
347 virtio_gpu_array_put_free(objs);
348 return ret;
349}
350
351static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
352 struct drm_file *file)
353{
354 struct virtio_gpu_device *vgdev = dev->dev_private;
355 struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
356 struct drm_virtgpu_3d_transfer_to_host *args = data;
357 struct virtio_gpu_object_array *objs;
358 struct virtio_gpu_fence *fence;
359 int ret;
360 u32 offset = args->offset;
361
362 objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
363 if (objs == NULL)
364 return -ENOENT;
365
366 if (!vgdev->has_virgl_3d) {
367 virtio_gpu_cmd_transfer_to_host_2d
368 (vgdev, offset,
369 args->box.w, args->box.h, args->box.x, args->box.y,
370 objs, NULL);
371 } else {
372 virtio_gpu_create_context(dev, file);
373 ret = virtio_gpu_array_lock_resv(objs);
374 if (ret != 0)
375 goto err_put_free;
376
377 ret = -ENOMEM;
378 fence = virtio_gpu_fence_alloc(vgdev);
379 if (!fence)
380 goto err_unlock;
381
382 virtio_gpu_cmd_transfer_to_host_3d
383 (vgdev,
384 vfpriv ? vfpriv->ctx_id : 0, offset,
385 args->level, &args->box, objs, fence);
386 dma_fence_put(&fence->f);
387 }
388 virtio_gpu_notify(vgdev);
389 return 0;
390
391err_unlock:
392 virtio_gpu_array_unlock_resv(objs);
393err_put_free:
394 virtio_gpu_array_put_free(objs);
395 return ret;
396}
397
398static int virtio_gpu_wait_ioctl(struct drm_device *dev, void *data,
399 struct drm_file *file)
400{
401 struct drm_virtgpu_3d_wait *args = data;
402 struct drm_gem_object *obj;
403 long timeout = 15 * HZ;
404 int ret;
405
406 obj = drm_gem_object_lookup(file, args->handle);
407 if (obj == NULL)
408 return -ENOENT;
409
410 if (args->flags & VIRTGPU_WAIT_NOWAIT) {
411 ret = dma_resv_test_signaled_rcu(obj->resv, true);
412 } else {
413 ret = dma_resv_wait_timeout_rcu(obj->resv, true, true,
414 timeout);
415 }
416 if (ret == 0)
417 ret = -EBUSY;
418 else if (ret > 0)
419 ret = 0;
420
421 drm_gem_object_put(obj);
422 return ret;
423}
424
425static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
426 void *data, struct drm_file *file)
427{
428 struct virtio_gpu_device *vgdev = dev->dev_private;
429 struct drm_virtgpu_get_caps *args = data;
430 unsigned size, host_caps_size;
431 int i;
432 int found_valid = -1;
433 int ret;
434 struct virtio_gpu_drv_cap_cache *cache_ent;
435 void *ptr;
436
437 if (vgdev->num_capsets == 0)
438 return -ENOSYS;
439
440 /* don't allow userspace to pass 0 */
441 if (args->size == 0)
442 return -EINVAL;
443
444 spin_lock(&vgdev->display_info_lock);
445 for (i = 0; i < vgdev->num_capsets; i++) {
446 if (vgdev->capsets[i].id == args->cap_set_id) {
447 if (vgdev->capsets[i].max_version >= args->cap_set_ver) {
448 found_valid = i;
449 break;
450 }
451 }
452 }
453
454 if (found_valid == -1) {
455 spin_unlock(&vgdev->display_info_lock);
456 return -EINVAL;
457 }
458
459 host_caps_size = vgdev->capsets[found_valid].max_size;
460 /* only copy to user the minimum of the host caps size or the guest caps size */
461 size = min(args->size, host_caps_size);
462
463 list_for_each_entry(cache_ent, &vgdev->cap_cache, head) {
464 if (cache_ent->id == args->cap_set_id &&
465 cache_ent->version == args->cap_set_ver) {
466 spin_unlock(&vgdev->display_info_lock);
467 goto copy_exit;
468 }
469 }
470 spin_unlock(&vgdev->display_info_lock);
471
472 /* not in cache - need to talk to hw */
473 virtio_gpu_cmd_get_capset(vgdev, found_valid, args->cap_set_ver,
474 &cache_ent);
475 virtio_gpu_notify(vgdev);
476
477copy_exit:
478 ret = wait_event_timeout(vgdev->resp_wq,
479 atomic_read(&cache_ent->is_valid), 5 * HZ);
480 if (!ret)
481 return -EBUSY;
482
483 /* is_valid check must proceed before copy of the cache entry. */
484 smp_rmb();
485
486 ptr = cache_ent->caps_cache;
487
488 if (copy_to_user(u64_to_user_ptr(args->addr), ptr, size))
489 return -EFAULT;
490
491 return 0;
492}
493
494struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {
495 DRM_IOCTL_DEF_DRV(VIRTGPU_MAP, virtio_gpu_map_ioctl,
496 DRM_RENDER_ALLOW),
497
498 DRM_IOCTL_DEF_DRV(VIRTGPU_EXECBUFFER, virtio_gpu_execbuffer_ioctl,
499 DRM_RENDER_ALLOW),
500
501 DRM_IOCTL_DEF_DRV(VIRTGPU_GETPARAM, virtio_gpu_getparam_ioctl,
502 DRM_RENDER_ALLOW),
503
504 DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_CREATE,
505 virtio_gpu_resource_create_ioctl,
506 DRM_RENDER_ALLOW),
507
508 DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_INFO, virtio_gpu_resource_info_ioctl,
509 DRM_RENDER_ALLOW),
510
511 /* make transfer async to the main ring? - no sure, can we
512 * thread these in the underlying GL
513 */
514 DRM_IOCTL_DEF_DRV(VIRTGPU_TRANSFER_FROM_HOST,
515 virtio_gpu_transfer_from_host_ioctl,
516 DRM_RENDER_ALLOW),
517 DRM_IOCTL_DEF_DRV(VIRTGPU_TRANSFER_TO_HOST,
518 virtio_gpu_transfer_to_host_ioctl,
519 DRM_RENDER_ALLOW),
520
521 DRM_IOCTL_DEF_DRV(VIRTGPU_WAIT, virtio_gpu_wait_ioctl,
522 DRM_RENDER_ALLOW),
523
524 DRM_IOCTL_DEF_DRV(VIRTGPU_GET_CAPS, virtio_gpu_get_caps_ioctl,
525 DRM_RENDER_ALLOW),
526};