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 int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
35 {
36 if (virtio_gpu_virglrenderer_workaround) {
37 /*
38 * Hack to avoid re-using resource IDs.
39 *
40 * virglrenderer versions up to (and including) 0.7.0
41 * can't deal with that. virglrenderer commit
42 * "f91a9dd35715 Fix unlinking resources from hash
43 * table." (Feb 2019) fixes the bug.
44 */
45 static atomic_t seqno = ATOMIC_INIT(0);
46 int handle = atomic_inc_return(&seqno);
47 *resid = handle + 1;
48 } else {
49 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
50 if (handle < 0)
51 return handle;
52 *resid = handle + 1;
53 }
54 return 0;
55 }
56
virtio_gpu_resource_id_put(struct virtio_gpu_device * vgdev,uint32_t id)57 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
58 {
59 if (!virtio_gpu_virglrenderer_workaround) {
60 ida_free(&vgdev->resource_ida, id - 1);
61 }
62 }
63
virtio_gpu_cleanup_object(struct virtio_gpu_object * bo)64 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
65 {
66 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
67
68 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
69 if (virtio_gpu_is_shmem(bo)) {
70 drm_gem_shmem_free(&bo->base);
71 } else if (virtio_gpu_is_vram(bo)) {
72 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
73
74 spin_lock(&vgdev->host_visible_lock);
75 if (drm_mm_node_allocated(&vram->vram_node))
76 drm_mm_remove_node(&vram->vram_node);
77
78 spin_unlock(&vgdev->host_visible_lock);
79
80 drm_gem_free_mmap_offset(&vram->base.base.base);
81 drm_gem_object_release(&vram->base.base.base);
82 kfree(vram);
83 }
84 }
85
virtio_gpu_free_object(struct drm_gem_object * obj)86 static void virtio_gpu_free_object(struct drm_gem_object *obj)
87 {
88 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
89 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
90
91 if (bo->created) {
92 virtio_gpu_cmd_unref_resource(vgdev, bo);
93 virtio_gpu_notify(vgdev);
94 /* completion handler calls virtio_gpu_cleanup_object() */
95 return;
96 }
97 virtio_gpu_cleanup_object(bo);
98 }
99
100 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
101 .free = virtio_gpu_free_object,
102 .open = virtio_gpu_gem_object_open,
103 .close = virtio_gpu_gem_object_close,
104 .print_info = drm_gem_shmem_object_print_info,
105 .export = virtgpu_gem_prime_export,
106 .pin = drm_gem_shmem_object_pin,
107 .unpin = drm_gem_shmem_object_unpin,
108 .get_sg_table = drm_gem_shmem_object_get_sg_table,
109 .vmap = drm_gem_shmem_object_vmap,
110 .vunmap = drm_gem_shmem_object_vunmap,
111 .mmap = drm_gem_shmem_object_mmap,
112 .vm_ops = &drm_gem_shmem_vm_ops,
113 };
114
virtio_gpu_is_shmem(struct virtio_gpu_object * bo)115 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
116 {
117 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
118 }
119
virtio_gpu_create_object(struct drm_device * dev,size_t size)120 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
121 size_t size)
122 {
123 struct virtio_gpu_object_shmem *shmem;
124 struct drm_gem_shmem_object *dshmem;
125
126 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
127 if (!shmem)
128 return ERR_PTR(-ENOMEM);
129
130 dshmem = &shmem->base.base;
131 dshmem->base.funcs = &virtio_gpu_shmem_funcs;
132 return &dshmem->base;
133 }
134
virtio_gpu_object_shmem_init(struct virtio_gpu_device * vgdev,struct virtio_gpu_object * bo,struct virtio_gpu_mem_entry ** ents,unsigned int * nents)135 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
136 struct virtio_gpu_object *bo,
137 struct virtio_gpu_mem_entry **ents,
138 unsigned int *nents)
139 {
140 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
141 struct scatterlist *sg;
142 struct sg_table *pages;
143 int si;
144
145 pages = drm_gem_shmem_get_pages_sgt(&bo->base);
146 if (IS_ERR(pages))
147 return PTR_ERR(pages);
148
149 if (use_dma_api)
150 *nents = pages->nents;
151 else
152 *nents = pages->orig_nents;
153
154 *ents = kvmalloc_array(*nents,
155 sizeof(struct virtio_gpu_mem_entry),
156 GFP_KERNEL);
157 if (!(*ents)) {
158 DRM_ERROR("failed to allocate ent list\n");
159 return -ENOMEM;
160 }
161
162 if (use_dma_api) {
163 for_each_sgtable_dma_sg(pages, sg, si) {
164 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
165 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
166 (*ents)[si].padding = 0;
167 }
168 } else {
169 for_each_sgtable_sg(pages, sg, si) {
170 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
171 (*ents)[si].length = cpu_to_le32(sg->length);
172 (*ents)[si].padding = 0;
173 }
174 }
175
176 return 0;
177 }
178
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)179 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
180 struct virtio_gpu_object_params *params,
181 struct virtio_gpu_object **bo_ptr,
182 struct virtio_gpu_fence *fence)
183 {
184 struct virtio_gpu_object_array *objs = NULL;
185 struct drm_gem_shmem_object *shmem_obj;
186 struct virtio_gpu_object *bo;
187 struct virtio_gpu_mem_entry *ents;
188 unsigned int nents;
189 int ret;
190
191 *bo_ptr = NULL;
192
193 params->size = roundup(params->size, PAGE_SIZE);
194 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
195 if (IS_ERR(shmem_obj))
196 return PTR_ERR(shmem_obj);
197 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
198
199 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
200 if (ret < 0)
201 goto err_free_gem;
202
203 bo->dumb = params->dumb;
204
205 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
206 if (ret != 0)
207 goto err_put_id;
208
209 if (fence) {
210 ret = -ENOMEM;
211 objs = virtio_gpu_array_alloc(1);
212 if (!objs)
213 goto err_put_id;
214 virtio_gpu_array_add_obj(objs, &bo->base.base);
215
216 ret = virtio_gpu_array_lock_resv(objs);
217 if (ret != 0)
218 goto err_put_objs;
219 }
220
221 if (params->blob) {
222 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
223 bo->guest_blob = true;
224
225 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
226 ents, nents);
227 } else if (params->virgl) {
228 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
229 objs, fence);
230 virtio_gpu_object_attach(vgdev, bo, ents, nents);
231 } else {
232 virtio_gpu_cmd_create_resource(vgdev, bo, params,
233 objs, fence);
234 virtio_gpu_object_attach(vgdev, bo, ents, nents);
235 }
236
237 *bo_ptr = bo;
238 return 0;
239
240 err_put_objs:
241 virtio_gpu_array_put_free(objs);
242 err_put_id:
243 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
244 err_free_gem:
245 drm_gem_shmem_free(shmem_obj);
246 return ret;
247 }
248
