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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/dma-mapping.h>
27#include <linux/moduleparam.h>
28
29#include <drm/drm_print.h>
30
31#include "virtgpu_drv.h"
32
33static int virtio_gpu_virglrenderer_workaround = 1;
34module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
35
36int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
37{
38 if (virtio_gpu_virglrenderer_workaround) {
39 /*
40 * Hack to avoid re-using resource IDs.
41 *
42 * virglrenderer versions up to (and including) 0.7.0
43 * can't deal with that. virglrenderer commit
44 * "f91a9dd35715 Fix unlinking resources from hash
45 * table." (Feb 2019) fixes the bug.
46 */
47 static atomic_t seqno = ATOMIC_INIT(0);
48 int handle = atomic_inc_return(&seqno);
49 *resid = handle + 1;
50 } else {
51 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
52
53 if (handle < 0)
54 return handle;
55 *resid = handle + 1;
56 }
57 return 0;
58}
59
60static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
61{
62 if (!virtio_gpu_virglrenderer_workaround)
63 ida_free(&vgdev->resource_ida, id - 1);
64}
65
66void virtio_gpu_remove_from_restore_list(struct virtio_gpu_object *bo)
67{
68 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
69
70 mutex_lock(&vgdev->obj_restore_lock);
71 list_del_init(&bo->restore_node);
72 mutex_unlock(&vgdev->obj_restore_lock);
73}
74
75void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
76{
77 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
78
79 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
80 if (virtio_gpu_is_shmem(bo)) {
81 drm_gem_shmem_free(&bo->base);
82 } else if (virtio_gpu_is_vram(bo)) {
83 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
84
85 spin_lock(&vgdev->host_visible_lock);
86 if (drm_mm_node_allocated(&vram->vram_node))
87 drm_mm_remove_node(&vram->vram_node);
88
89 spin_unlock(&vgdev->host_visible_lock);
90
91 drm_gem_free_mmap_offset(&vram->base.base.base);
92 drm_gem_object_release(&vram->base.base.base);
93 kfree(vram);
94 } else {
95 drm_gem_object_release(&bo->base.base);
96 kfree(bo);
97 }
98}
99
100static void virtio_gpu_free_object(struct drm_gem_object *obj)
101{
102 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
103 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
104
105 if (bo->created) {
106 virtio_gpu_remove_from_restore_list(bo);
107 virtio_gpu_cmd_unref_resource(vgdev, bo, false);
108 virtio_gpu_notify(vgdev);
109 /* completion handler calls virtio_gpu_cleanup_object() */
110 return;
111 }
112 virtio_gpu_cleanup_object(bo);
113}
114
115int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo)
116{
117 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
118 struct virtio_gpu_fence *fence;
119
120 if (!bo->attached)
121 return 0;
122
123 fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
124 if (!fence)
125 return -ENOMEM;
126
127 virtio_gpu_object_detach(vgdev, bo, fence);
128 virtio_gpu_notify(vgdev);
129
130 dma_fence_wait(&fence->f, false);
131 dma_fence_put(&fence->f);
132
133 return 0;
134}
135
136static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
137 .free = virtio_gpu_free_object,
138 .open = virtio_gpu_gem_object_open,
139 .close = virtio_gpu_gem_object_close,
140 .print_info = drm_gem_shmem_object_print_info,
141 .export = virtgpu_gem_prime_export,
142 .pin = drm_gem_shmem_object_pin,
143 .unpin = drm_gem_shmem_object_unpin,
144 .get_sg_table = drm_gem_shmem_object_get_sg_table,
145 .vmap = drm_gem_shmem_object_vmap,
146 .vunmap = drm_gem_shmem_object_vunmap,
147 .mmap = drm_gem_shmem_object_mmap,
148 .vm_ops = &drm_gem_shmem_vm_ops,
149};
150
151bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
152{
153 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
154}
155
156struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
157 size_t size)
158{
159 struct virtio_gpu_object_shmem *shmem;
160 struct drm_gem_shmem_object *dshmem;
161
162 shmem = kzalloc_obj(*shmem);
163 if (!shmem)
164 return ERR_PTR(-ENOMEM);
165
166 dshmem = &shmem->base.base;
167 dshmem->base.funcs = &virtio_gpu_shmem_funcs;
168 return &dshmem->base;
169}
170
171static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
172 struct virtio_gpu_object *bo,
173 struct virtio_gpu_mem_entry **ents,
174 unsigned int *nents)
175{
176 bool use_dma_api = virtio_gpu_use_dma_api(vgdev->vdev);
177 struct scatterlist *sg;
178 struct sg_table *pages;
179 int si;
180
181 pages = drm_gem_shmem_get_pages_sgt(&bo->base);
182 if (IS_ERR(pages))
183 return PTR_ERR(pages);
184
185 if (use_dma_api)
186 *nents = pages->nents;
187 else
188 *nents = pages->orig_nents;
189
190 *ents = kvmalloc_objs(struct virtio_gpu_mem_entry, *nents);
191 if (!(*ents)) {
192 DRM_ERROR("failed to allocate ent list\n");
193 return -ENOMEM;
194 }
195
196 if (use_dma_api) {
197 for_each_sgtable_dma_sg(pages, sg, si) {
198 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
199 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
200 (*ents)[si].padding = 0;
201 }
202 } else {
203 for_each_sgtable_sg(pages, sg, si) {
204 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
205 (*ents)[si].length = cpu_to_le32(sg->length);
206 (*ents)[si].padding = 0;
207 }
208 }
209
210 return 0;
211}
212
213int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
214 struct virtio_gpu_object_params *params,
215 struct virtio_gpu_object **bo_ptr,
216 struct virtio_gpu_fence *fence)
217{
218 struct virtio_gpu_object_array *objs = NULL;
219 struct drm_gem_shmem_object *shmem_obj;
220 struct virtio_gpu_object *bo;
221 struct virtio_gpu_mem_entry *ents = NULL;
222 unsigned int nents;
223 int ret;
224
225 *bo_ptr = NULL;
226
227 params->size = roundup(params->size, PAGE_SIZE);
228 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
229 if (IS_ERR(shmem_obj))
230 return PTR_ERR(shmem_obj);
231 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
232
233 INIT_LIST_HEAD(&bo->restore_node);
234
235 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
236 if (ret < 0)
237 goto err_free_gem;
238
239 bo->dumb = params->dumb;
240
241 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
242 if (ret != 0)
243 goto err_put_id;
244
245 if (fence) {
246 ret = -ENOMEM;
247 objs = virtio_gpu_array_alloc(1);
248 if (!objs)
249 goto err_free_entry;
250 virtio_gpu_array_add_obj(objs, &bo->base.base);
251
252 ret = virtio_gpu_array_lock_resv(objs);
253 if (ret != 0)
254 goto err_put_objs;
255 }
256
257 if (params->blob) {
258 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
259 bo->guest_blob = true;
260
261 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
262 ents, nents);
263 } else if (params->virgl) {
264 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
265 objs, fence);
266 virtio_gpu_object_attach(vgdev, bo, ents, nents);
267 } else {
268 virtio_gpu_cmd_create_resource(vgdev, bo, params,
269 objs, fence);
270 virtio_gpu_object_attach(vgdev, bo, ents, nents);
271 }
272
273 if (!params->virgl) {
274 /* store non-virgl object with its param to the restore list */
275 bo->params = *params;
276 virtio_gpu_add_object_to_restore_list(vgdev, bo);
277 }
278
279 *bo_ptr = bo;
280 return 0;
281
282err_put_objs:
283 virtio_gpu_array_put_free(objs);
284err_free_entry:
285 kvfree(ents);
286err_put_id:
287 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
288err_free_gem:
289 drm_gem_shmem_free(shmem_obj);
290 return ret;
291}
292
293void virtio_gpu_add_object_to_restore_list(struct virtio_gpu_device *vgdev,
294 struct virtio_gpu_object *bo)
295{
296 mutex_lock(&vgdev->obj_restore_lock);
297 list_add_tail(&bo->restore_node, &vgdev->obj_restore_list);
298 mutex_unlock(&vgdev->obj_restore_lock);
299}
300
301int virtio_gpu_object_restore_all(struct virtio_gpu_device *vgdev)
302{
303 struct virtio_gpu_object *bo, *tmp;
304 struct virtio_gpu_mem_entry *ents;
305 unsigned int nents;
306 int ret = 0;
307
308 mutex_lock(&vgdev->obj_restore_lock);
309 list_for_each_entry_safe(bo, tmp, &vgdev->obj_restore_list,
310 restore_node) {
311 if (drm_gem_is_imported(&bo->base.base)) {
312 ret = virtgpu_dma_buf_obj_resubmit(vgdev, bo);
313 if (ret)
314 break;
315
316 continue;
317 }
318
319 if (bo->params.blob || bo->attached) {
320 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents,
321 &nents);
322 if (ret)
323 break;
324 }
325
326 if (bo->params.blob) {
327 virtio_gpu_cmd_resource_create_blob(vgdev, bo,
328 &bo->params,
329 ents, nents);
330 } else {
331 virtio_gpu_cmd_create_resource(vgdev, bo, &bo->params,
332 NULL, NULL);
333 if (bo->attached) {
334 bo->attached = false;
335 virtio_gpu_object_attach(vgdev, bo, ents,
336 nents);
337 }
338 }
339 }
340 mutex_unlock(&vgdev->obj_restore_lock);
341
342 if (ret)
343 DRM_ERROR("failed to restore virtio-gpu objects: %d\n", ret);
344
345 return ret;
346}
347
348void virtio_gpu_object_unref_all(struct virtio_gpu_device *vgdev)
349{
350 struct virtio_gpu_object *bo, *tmp;
351
352 mutex_lock(&vgdev->obj_restore_lock);
353 list_for_each_entry_safe(bo, tmp, &vgdev->obj_restore_list,
354 restore_node)
355 if (bo->created) {
356 virtio_gpu_cmd_unref_resource(vgdev, bo, true);
357 virtio_gpu_notify(vgdev);
358 }
359
360 mutex_unlock(&vgdev->obj_restore_lock);
361}