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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
34static 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
58static 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
65void 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_sg(vgdev->vdev->dev.parent,
76 shmem->pages->sgl, shmem->mapped,
77 DMA_TO_DEVICE);
78 shmem->mapped = 0;
79 }
80
81 sg_free_table(shmem->pages);
82 kfree(shmem->pages);
83 shmem->pages = NULL;
84 drm_gem_shmem_unpin(&bo->base.base);
85 }
86
87 drm_gem_shmem_free_object(&bo->base.base);
88 }
89}
90
91static void virtio_gpu_free_object(struct drm_gem_object *obj)
92{
93 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
94 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
95
96 if (bo->created) {
97 virtio_gpu_cmd_unref_resource(vgdev, bo);
98 virtio_gpu_notify(vgdev);
99 /* completion handler calls virtio_gpu_cleanup_object() */
100 return;
101 }
102 virtio_gpu_cleanup_object(bo);
103}
104
105static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
106 .free = virtio_gpu_free_object,
107 .open = virtio_gpu_gem_object_open,
108 .close = virtio_gpu_gem_object_close,
109
110 .print_info = drm_gem_shmem_print_info,
111 .pin = drm_gem_shmem_pin,
112 .unpin = drm_gem_shmem_unpin,
113 .get_sg_table = drm_gem_shmem_get_sg_table,
114 .vmap = drm_gem_shmem_vmap,
115 .vunmap = drm_gem_shmem_vunmap,
116 .mmap = drm_gem_shmem_mmap,
117};
118
119bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
120{
121 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
122}
123
124struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
125 size_t size)
126{
127 struct virtio_gpu_object_shmem *shmem;
128 struct drm_gem_shmem_object *dshmem;
129
130 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
131 if (!shmem)
132 return NULL;
133
134 dshmem = &shmem->base.base;
135 dshmem->base.funcs = &virtio_gpu_shmem_funcs;
136 dshmem->map_cached = true;
137 return &dshmem->base;
138}
139
140static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
141 struct virtio_gpu_object *bo,
142 struct virtio_gpu_mem_entry **ents,
143 unsigned int *nents)
144{
145 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
146 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
147 struct scatterlist *sg;
148 int si, ret;
149
150 ret = drm_gem_shmem_pin(&bo->base.base);
151 if (ret < 0)
152 return -EINVAL;
153
154 /*
155 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
156 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
157 * dma-ops. This is discouraged for other drivers, but should be fine
158 * since virtio_gpu doesn't support dma-buf import from other devices.
159 */
160 shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
161 if (!shmem->pages) {
162 drm_gem_shmem_unpin(&bo->base.base);
163 return -EINVAL;
164 }
165
166 if (use_dma_api) {
167 shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
168 shmem->pages->sgl,
169 shmem->pages->nents,
170 DMA_TO_DEVICE);
171 *nents = shmem->mapped;
172 } else {
173 *nents = shmem->pages->nents;
174 }
175
176 *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
177 GFP_KERNEL);
178 if (!(*ents)) {
179 DRM_ERROR("failed to allocate ent list\n");
180 return -ENOMEM;
181 }
182
183 for_each_sg(shmem->pages->sgl, sg, *nents, si) {
184 (*ents)[si].addr = cpu_to_le64(use_dma_api
185 ? sg_dma_address(sg)
186 : sg_phys(sg));
187 (*ents)[si].length = cpu_to_le32(sg->length);
188 (*ents)[si].padding = 0;
189 }
190 return 0;
191}
192
193int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
194 struct virtio_gpu_object_params *params,
195 struct virtio_gpu_object **bo_ptr,
196 struct virtio_gpu_fence *fence)
197{
198 struct virtio_gpu_object_array *objs = NULL;
199 struct drm_gem_shmem_object *shmem_obj;
200 struct virtio_gpu_object *bo;
201 struct virtio_gpu_mem_entry *ents;
202 unsigned int nents;
203 int ret;
204
205 *bo_ptr = NULL;
206
207 params->size = roundup(params->size, PAGE_SIZE);
208 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
209 if (IS_ERR(shmem_obj))
210 return PTR_ERR(shmem_obj);
211 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
212
213 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
214 if (ret < 0)
215 goto err_free_gem;
216
217 bo->dumb = params->dumb;
218
219 if (fence) {
220 ret = -ENOMEM;
221 objs = virtio_gpu_array_alloc(1);
222 if (!objs)
223 goto err_put_id;
224 virtio_gpu_array_add_obj(objs, &bo->base.base);
225
226 ret = virtio_gpu_array_lock_resv(objs);
227 if (ret != 0)
228 goto err_put_objs;
229 }
230
231 if (params->virgl) {
232 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
233 objs, fence);
234 } else {
235 virtio_gpu_cmd_create_resource(vgdev, bo, params,
236 objs, fence);
237 }
238
239 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
240 if (ret != 0) {
241 virtio_gpu_free_object(&shmem_obj->base);
242 return ret;
243 }
244
245 virtio_gpu_object_attach(vgdev, bo, ents, nents);
246
247 *bo_ptr = bo;
248 return 0;
249
250err_put_objs:
251 virtio_gpu_array_put_free(objs);
252err_put_id:
253 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
254err_free_gem:
255 drm_gem_shmem_free_object(&shmem_obj->base);
256 return ret;
257}
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 "virtgpu_drv.h"
27
28static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
29{
30 struct virtio_gpu_object *bo;
31 struct virtio_gpu_device *vgdev;
32
33 bo = container_of(tbo, struct virtio_gpu_object, tbo);
34 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
35
36 if (bo->hw_res_handle)
37 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
38 if (bo->pages)
39 virtio_gpu_object_free_sg_table(bo);
40 drm_gem_object_release(&bo->gem_base);
41 kfree(bo);
42}
43
44static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
45 bool pinned)
46{
47 u32 c = 1;
48 u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
49
50 vgbo->placement.placement = &vgbo->placement_code;
51 vgbo->placement.busy_placement = &vgbo->placement_code;
52 vgbo->placement_code.fpfn = 0;
53 vgbo->placement_code.lpfn = 0;
54 vgbo->placement_code.flags =
55 TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
56 vgbo->placement.num_placement = c;
57 vgbo->placement.num_busy_placement = c;
58
59}
60
61int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
62 unsigned long size, bool kernel, bool pinned,
63 struct virtio_gpu_object **bo_ptr)
64{
65 struct virtio_gpu_object *bo;
66 enum ttm_bo_type type;
67 size_t acc_size;
68 int ret;
69
70 if (kernel)
71 type = ttm_bo_type_kernel;
72 else
73 type = ttm_bo_type_device;
74 *bo_ptr = NULL;
75
76 acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
77 sizeof(struct virtio_gpu_object));
78
79 bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
80 if (bo == NULL)
81 return -ENOMEM;
82 size = roundup(size, PAGE_SIZE);
83 ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
84 if (ret != 0)
85 return ret;
86 bo->dumb = false;
87 virtio_gpu_init_ttm_placement(bo, pinned);
88
89 ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
90 &bo->placement, 0, !kernel, NULL, acc_size,
91 NULL, NULL, &virtio_gpu_ttm_bo_destroy);
92 /* ttm_bo_init failure will call the destroy */
93 if (ret != 0)
94 return ret;
95
96 *bo_ptr = bo;
97 return 0;
98}
99
100int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
101{
102 bool is_iomem;
103 int r;
104
105 if (bo->vmap) {
106 if (ptr)
107 *ptr = bo->vmap;
108 return 0;
109 }
110 r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
111 if (r)
112 return r;
113 bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
114 if (ptr)
115 *ptr = bo->vmap;
116 return 0;
117}
118
119int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
120 struct virtio_gpu_object *bo)
121{
122 int ret;
123 struct page **pages = bo->tbo.ttm->pages;
124 int nr_pages = bo->tbo.num_pages;
125
126 /* wtf swapping */
127 if (bo->pages)
128 return 0;
129
130 if (bo->tbo.ttm->state == tt_unpopulated)
131 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm);
132 bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
133 if (!bo->pages)
134 goto out;
135
136 ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
137 nr_pages << PAGE_SHIFT, GFP_KERNEL);
138 if (ret)
139 goto out;
140 return 0;
141out:
142 kfree(bo->pages);
143 bo->pages = NULL;
144 return -ENOMEM;
145}
146
147void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
148{
149 sg_free_table(bo->pages);
150 kfree(bo->pages);
151 bo->pages = NULL;
152}
153
154int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
155{
156 int r;
157
158 r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
159 if (unlikely(r != 0))
160 return r;
161 r = ttm_bo_wait(&bo->tbo, true, no_wait);
162 ttm_bo_unreserve(&bo->tbo);
163 return r;
164}
165