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 "virtgpu_drv.h"
30
31 static int virtio_gpu_virglrenderer_workaround = 1;
32 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
33
virtio_gpu_resource_id_get(struct virtio_gpu_device * vgdev,uint32_t * resid)34 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
35 uint32_t *resid)
36 {
37 if (virtio_gpu_virglrenderer_workaround) {
38 /*
39 * Hack to avoid re-using resource IDs.
40 *
41 * virglrenderer versions up to (and including) 0.7.0
42 * can't deal with that. virglrenderer commit
43 * "f91a9dd35715 Fix unlinking resources from hash
44 * table." (Feb 2019) fixes the bug.
45 */
46 static atomic_t seqno = ATOMIC_INIT(0);
47 int handle = atomic_inc_return(&seqno);
48 *resid = handle + 1;
49 } else {
50 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
51 if (handle < 0)
52 return handle;
53 *resid = handle + 1;
54 }
55 return 0;
56 }
57
virtio_gpu_resource_id_put(struct virtio_gpu_device * vgdev,uint32_t id)58 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
59 {
60 if (!virtio_gpu_virglrenderer_workaround) {
61 ida_free(&vgdev->resource_ida, id - 1);
62 }
63 }
64
virtio_gpu_cleanup_object(struct virtio_gpu_object * bo)65 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
66 {
67 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
68
69 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
70 if (virtio_gpu_is_shmem(bo)) {
71 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
72
73 if (shmem->pages) {
74 if (shmem->mapped) {
75 dma_unmap_sgtable(vgdev->vdev->dev.parent,
76 shmem->pages, DMA_TO_DEVICE, 0);
77 shmem->mapped = 0;
78 }
79
80 sg_free_table(shmem->pages);
81 kfree(shmem->pages);
82 shmem->pages = NULL;
83 drm_gem_shmem_unpin(&bo->base.base);
84 }
85
86 drm_gem_shmem_free_object(&bo->base.base);
87 }
88 }
89
virtio_gpu_free_object(struct drm_gem_object * obj)90 static void virtio_gpu_free_object(struct drm_gem_object *obj)
91 {
92 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
93 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
94
95 if (bo->created) {
96 virtio_gpu_cmd_unref_resource(vgdev, bo);
97 virtio_gpu_notify(vgdev);
98 /* completion handler calls virtio_gpu_cleanup_object() */
99 return;
100 }
101 virtio_gpu_cleanup_object(bo);
102 }
103
104 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
105 .free = virtio_gpu_free_object,
106 .open = virtio_gpu_gem_object_open,
107 .close = virtio_gpu_gem_object_close,
108
109 .print_info = drm_gem_shmem_print_info,
110 .pin = drm_gem_shmem_pin,
111 .unpin = drm_gem_shmem_unpin,
112 .get_sg_table = drm_gem_shmem_get_sg_table,
113 .vmap = drm_gem_shmem_vmap,
114 .vunmap = drm_gem_shmem_vunmap,
115 .mmap = drm_gem_shmem_mmap,
116 };
117
virtio_gpu_is_shmem(struct virtio_gpu_object * bo)118 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
119 {
120 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
121 }
122
virtio_gpu_create_object(struct drm_device * dev,size_t size)123 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
124 size_t size)
125 {
126 struct virtio_gpu_object_shmem *shmem;
127 struct drm_gem_shmem_object *dshmem;
128
129 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
130 if (!shmem)
131 return NULL;
132
133 dshmem = &shmem->base.base;
134 dshmem->base.funcs = &virtio_gpu_shmem_funcs;
135 dshmem->map_cached = true;
136 return &dshmem->base;
137 }
138
virtio_gpu_object_shmem_init(struct virtio_gpu_device * vgdev,struct virtio_gpu_object * bo,struct virtio_gpu_mem_entry ** ents,unsigned int * nents)139 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
140 struct virtio_gpu_object *bo,
141 struct virtio_gpu_mem_entry **ents,
142 unsigned int *nents)
143 {
144 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
145 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
146 struct scatterlist *sg;
147 int si, ret;
148
149 ret = drm_gem_shmem_pin(&bo->base.base);
150 if (ret < 0)
151 return -EINVAL;
152
153 /*
154 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
155 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
156 * dma-ops. This is discouraged for other drivers, but should be fine
157 * since virtio_gpu doesn't support dma-buf import from other devices.
158 */
159 shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
160 if (IS_ERR(shmem->pages)) {
161 drm_gem_shmem_unpin(&bo->base.base);
162 ret = PTR_ERR(shmem->pages);
163 shmem->pages = NULL;
164 return ret;
165 }
166
167 if (use_dma_api) {
168 ret = dma_map_sgtable(vgdev->vdev->dev.parent,
169 shmem->pages, DMA_TO_DEVICE, 0);
170 if (ret)
171 return ret;
172 *nents = shmem->mapped = shmem->pages->nents;
173 } else {
174 *nents = shmem->pages->orig_nents;
175 }
176
177 *ents = kvmalloc_array(*nents,
178 sizeof(struct virtio_gpu_mem_entry),
179 GFP_KERNEL);
180 if (!(*ents)) {
181 DRM_ERROR("failed to allocate ent list\n");
182 return -ENOMEM;
183 }
184
185 if (use_dma_api) {
186 for_each_sgtable_dma_sg(shmem->pages, sg, si) {
187 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
188 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
189 (*ents)[si].padding = 0;
190 }
191 } else {
192 for_each_sgtable_sg(shmem->pages, sg, si) {
193 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
194 (*ents)[si].length = cpu_to_le32(sg->length);
195 (*ents)[si].padding = 0;
196 }
197 }
198
199 return 0;
200 }
201
virtio_gpu_object_create(struct virtio_gpu_device * vgdev,struct virtio_gpu_object_params * params,struct virtio_gpu_object ** bo_ptr,struct virtio_gpu_fence * fence)202 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
203 struct virtio_gpu_object_params *params,
204 struct virtio_gpu_object **bo_ptr,
205 struct virtio_gpu_fence *fence)
206 {
207 struct virtio_gpu_object_array *objs = NULL;
208 struct drm_gem_shmem_object *shmem_obj;
209 struct virtio_gpu_object *bo;
210 struct virtio_gpu_mem_entry *ents;
211 unsigned int nents;
212 int ret;
213
214 *bo_ptr = NULL;
215
216 params->size = roundup(params->size, PAGE_SIZE);
217 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
218 if (IS_ERR(shmem_obj))
219 return PTR_ERR(shmem_obj);
220 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
221
222 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
223 if (ret < 0)
224 goto err_free_gem;
225
226 bo->dumb = params->dumb;
227
228 if (fence) {
229 ret = -ENOMEM;
230 objs = virtio_gpu_array_alloc(1);
231 if (!objs)
232 goto err_put_id;
233 virtio_gpu_array_add_obj(objs, &bo->base.base);
234
235 ret = virtio_gpu_array_lock_resv(objs);
236 if (ret != 0)
237 goto err_put_objs;
238 }
239
240 if (params->virgl) {
241 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
242 objs, fence);
243 } else {
244 virtio_gpu_cmd_create_resource(vgdev, bo, params,
245 objs, fence);
246 }
247
248 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
249 if (ret != 0) {
250 virtio_gpu_free_object(&shmem_obj->base);
251 return ret;
252 }
253
254 virtio_gpu_object_attach(vgdev, bo, ents, nents);
255
256 *bo_ptr = bo;
257 return 0;
258
259 err_put_objs:
260 virtio_gpu_array_put_free(objs);
261 err_put_id:
262 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
263 err_free_gem:
264 drm_gem_shmem_free_object(&shmem_obj->base);
265 return ret;
266 }
267