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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 "virtgpu_drv.h"
30
31static int virtio_gpu_virglrenderer_workaround = 1;
32module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
33
34int 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
57static 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
64void 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
86static 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
100static 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
115bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
116{
117 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
118}
119
120struct 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
135static 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
179int 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 = NULL;
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_free_entry;
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
240err_put_objs:
241 virtio_gpu_array_put_free(objs);
242err_free_entry:
243 kvfree(ents);
244err_put_id:
245 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
246err_free_gem:
247 drm_gem_shmem_free(shmem_obj);
248 return ret;
249}
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
31static int virtio_gpu_virglrenderer_workaround = 1;
32module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
33
34int 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
57static 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
64void 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 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
71
72 if (shmem->pages) {
73 if (shmem->mapped) {
74 dma_unmap_sgtable(vgdev->vdev->dev.parent,
75 shmem->pages, DMA_TO_DEVICE, 0);
76 shmem->mapped = 0;
77 }
78
79 sg_free_table(shmem->pages);
80 kfree(shmem->pages);
81 shmem->pages = NULL;
82 drm_gem_shmem_unpin(&bo->base.base);
83 }
84
85 drm_gem_shmem_free_object(&bo->base.base);
86 } else if (virtio_gpu_is_vram(bo)) {
87 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
88
89 spin_lock(&vgdev->host_visible_lock);
90 if (drm_mm_node_allocated(&vram->vram_node))
91 drm_mm_remove_node(&vram->vram_node);
92
93 spin_unlock(&vgdev->host_visible_lock);
94
95 drm_gem_free_mmap_offset(&vram->base.base.base);
96 drm_gem_object_release(&vram->base.base.base);
97 kfree(vram);
98 }
99}
100
101static void virtio_gpu_free_object(struct drm_gem_object *obj)
102{
103 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
104 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
105
106 if (bo->created) {
107 virtio_gpu_cmd_unref_resource(vgdev, bo);
108 virtio_gpu_notify(vgdev);
109 /* completion handler calls virtio_gpu_cleanup_object() */
110 return;
111 }
112 virtio_gpu_cleanup_object(bo);
113}
114
115static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
116 .free = virtio_gpu_free_object,
117 .open = virtio_gpu_gem_object_open,
118 .close = virtio_gpu_gem_object_close,
119
120 .print_info = drm_gem_shmem_print_info,
121 .export = virtgpu_gem_prime_export,
122 .pin = drm_gem_shmem_pin,
123 .unpin = drm_gem_shmem_unpin,
124 .get_sg_table = drm_gem_shmem_get_sg_table,
125 .vmap = drm_gem_shmem_vmap,
126 .vunmap = drm_gem_shmem_vunmap,
127 .mmap = drm_gem_shmem_mmap,
128};
129
130bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
131{
132 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
133}
134
135struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
136 size_t size)
137{
138 struct virtio_gpu_object_shmem *shmem;
139 struct drm_gem_shmem_object *dshmem;
140
141 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
142 if (!shmem)
143 return NULL;
144
145 dshmem = &shmem->base.base;
146 dshmem->base.funcs = &virtio_gpu_shmem_funcs;
147 return &dshmem->base;
148}
149
150static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
151 struct virtio_gpu_object *bo,
152 struct virtio_gpu_mem_entry **ents,
153 unsigned int *nents)
154{
155 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
156 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
157 struct scatterlist *sg;
158 int si, ret;
159
160 ret = drm_gem_shmem_pin(&bo->base.base);
161 if (ret < 0)
162 return -EINVAL;
163
164 /*
165 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
166 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
167 * dma-ops. This is discouraged for other drivers, but should be fine
168 * since virtio_gpu doesn't support dma-buf import from other devices.
169 */
170 shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
171 if (!shmem->pages) {
172 drm_gem_shmem_unpin(&bo->base.base);
173 return -EINVAL;
174 }
175
176 if (use_dma_api) {
177 ret = dma_map_sgtable(vgdev->vdev->dev.parent,
178 shmem->pages, DMA_TO_DEVICE, 0);
179 if (ret)
180 return ret;
181 *nents = shmem->mapped = shmem->pages->nents;
182 } else {
183 *nents = shmem->pages->orig_nents;
184 }
185
186 *ents = kvmalloc_array(*nents,
187 sizeof(struct virtio_gpu_mem_entry),
188 GFP_KERNEL);
189 if (!(*ents)) {
190 DRM_ERROR("failed to allocate ent list\n");
191 return -ENOMEM;
192 }
193
194 if (use_dma_api) {
195 for_each_sgtable_dma_sg(shmem->pages, sg, si) {
196 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
197 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
198 (*ents)[si].padding = 0;
199 }
200 } else {
201 for_each_sgtable_sg(shmem->pages, sg, si) {
202 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
203 (*ents)[si].length = cpu_to_le32(sg->length);
204 (*ents)[si].padding = 0;
205 }
206 }
207
208 return 0;
209}
210
211int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
212 struct virtio_gpu_object_params *params,
213 struct virtio_gpu_object **bo_ptr,
214 struct virtio_gpu_fence *fence)
215{
216 struct virtio_gpu_object_array *objs = NULL;
217 struct drm_gem_shmem_object *shmem_obj;
218 struct virtio_gpu_object *bo;
219 struct virtio_gpu_mem_entry *ents;
220 unsigned int nents;
221 int ret;
222
223 *bo_ptr = NULL;
224
225 params->size = roundup(params->size, PAGE_SIZE);
226 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
227 if (IS_ERR(shmem_obj))
228 return PTR_ERR(shmem_obj);
229 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
230
231 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
232 if (ret < 0)
233 goto err_free_gem;
234
235 bo->dumb = params->dumb;
236
237 if (fence) {
238 ret = -ENOMEM;
239 objs = virtio_gpu_array_alloc(1);
240 if (!objs)
241 goto err_put_id;
242 virtio_gpu_array_add_obj(objs, &bo->base.base);
243
244 ret = virtio_gpu_array_lock_resv(objs);
245 if (ret != 0)
246 goto err_put_objs;
247 }
248
249 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
250 if (ret != 0) {
251 virtio_gpu_array_put_free(objs);
252 virtio_gpu_free_object(&shmem_obj->base);
253 return ret;
254 }
255
256 if (params->blob) {
257 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
258 bo->guest_blob = true;
259
260 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
261 ents, nents);
262 } else if (params->virgl) {
263 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
264 objs, fence);
265 virtio_gpu_object_attach(vgdev, bo, ents, nents);
266 } else {
267 virtio_gpu_cmd_create_resource(vgdev, bo, params,
268 objs, fence);
269 virtio_gpu_object_attach(vgdev, bo, ents, nents);
270 }
271
272 *bo_ptr = bo;
273 return 0;
274
275err_put_objs:
276 virtio_gpu_array_put_free(objs);
277err_put_id:
278 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
279err_free_gem:
280 drm_gem_shmem_free_object(&shmem_obj->base);
281 return ret;
282}