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 (!shmem->pages) {
161 drm_gem_shmem_unpin(&bo->base.base);
162 return -EINVAL;
163 }
164
165 if (use_dma_api) {
166 ret = dma_map_sgtable(vgdev->vdev->dev.parent,
167 shmem->pages, DMA_TO_DEVICE, 0);
168 if (ret)
169 return ret;
170 *nents = shmem->mapped = shmem->pages->nents;
171 } else {
172 *nents = shmem->pages->orig_nents;
173 }
174
175 *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
176 GFP_KERNEL);
177 if (!(*ents)) {
178 DRM_ERROR("failed to allocate ent list\n");
179 return -ENOMEM;
180 }
181
182 if (use_dma_api) {
183 for_each_sgtable_dma_sg(shmem->pages, sg, si) {
184 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
185 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
186 (*ents)[si].padding = 0;
187 }
188 } else {
189 for_each_sgtable_sg(shmem->pages, sg, si) {
190 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
191 (*ents)[si].length = cpu_to_le32(sg->length);
192 (*ents)[si].padding = 0;
193 }
194 }
195
196 return 0;
197 }
198
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)199 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
200 struct virtio_gpu_object_params *params,
201 struct virtio_gpu_object **bo_ptr,
202 struct virtio_gpu_fence *fence)
203 {
204 struct virtio_gpu_object_array *objs = NULL;
205 struct drm_gem_shmem_object *shmem_obj;
206 struct virtio_gpu_object *bo;
207 struct virtio_gpu_mem_entry *ents;
208 unsigned int nents;
209 int ret;
210
211 *bo_ptr = NULL;
212
213 params->size = roundup(params->size, PAGE_SIZE);
214 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
215 if (IS_ERR(shmem_obj))
216 return PTR_ERR(shmem_obj);
217 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
218
219 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
220 if (ret < 0)
221 goto err_free_gem;
222
223 bo->dumb = params->dumb;
224
225 if (fence) {
226 ret = -ENOMEM;
227 objs = virtio_gpu_array_alloc(1);
228 if (!objs)
229 goto err_put_id;
230 virtio_gpu_array_add_obj(objs, &bo->base.base);
231
232 ret = virtio_gpu_array_lock_resv(objs);
233 if (ret != 0)
234 goto err_put_objs;
235 }
236
237 if (params->virgl) {
238 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
239 objs, fence);
240 } else {
241 virtio_gpu_cmd_create_resource(vgdev, bo, params,
242 objs, fence);
243 }
244
245 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
246 if (ret != 0) {
247 virtio_gpu_free_object(&shmem_obj->base);
248 return ret;
249 }
250
251 virtio_gpu_object_attach(vgdev, bo, ents, nents);
252
253 *bo_ptr = bo;
254 return 0;
255
256 err_put_objs:
257 virtio_gpu_array_put_free(objs);
258 err_put_id:
259 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
260 err_free_gem:
261 drm_gem_shmem_free_object(&shmem_obj->base);
262 return ret;
263 }
264
