1 /* $NetBSD: virtgpu_object.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $ */
2
3 /*
4 * Copyright (C) 2015 Red Hat, Inc.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining
8 * a copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sublicense, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial
17 * portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
22 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
23 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: virtgpu_object.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $");
30
31 #include <linux/moduleparam.h>
32
33 #include "virtgpu_drv.h"
34
35 static int virtio_gpu_virglrenderer_workaround = 1;
36 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
37
virtio_gpu_resource_id_get(struct virtio_gpu_device * vgdev,uint32_t * resid)38 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
39 uint32_t *resid)
40 {
41 if (virtio_gpu_virglrenderer_workaround) {
42 /*
43 * Hack to avoid re-using resource IDs.
44 *
45 * virglrenderer versions up to (and including) 0.7.0
46 * can't deal with that. virglrenderer commit
47 * "f91a9dd35715 Fix unlinking resources from hash
48 * table." (Feb 2019) fixes the bug.
49 */
50 static int handle;
51 handle++;
52 *resid = handle + 1;
53 } else {
54 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
55 if (handle < 0)
56 return handle;
57 *resid = handle + 1;
58 }
59 return 0;
60 }
61
virtio_gpu_resource_id_put(struct virtio_gpu_device * vgdev,uint32_t id)62 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
63 {
64 if (!virtio_gpu_virglrenderer_workaround) {
65 ida_free(&vgdev->resource_ida, id - 1);
66 }
67 }
68
virtio_gpu_free_object(struct drm_gem_object * obj)69 static void virtio_gpu_free_object(struct drm_gem_object *obj)
70 {
71 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
72 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
73
74 if (bo->pages)
75 virtio_gpu_object_detach(vgdev, bo);
76 if (bo->created)
77 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
78 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
79
80 drm_gem_shmem_free_object(obj);
81 }
82
83 static const struct drm_gem_object_funcs virtio_gpu_gem_funcs = {
84 .free = virtio_gpu_free_object,
85 .open = virtio_gpu_gem_object_open,
86 .close = virtio_gpu_gem_object_close,
87
88 .print_info = drm_gem_shmem_print_info,
89 .pin = drm_gem_shmem_pin,
90 .unpin = drm_gem_shmem_unpin,
91 .get_sg_table = drm_gem_shmem_get_sg_table,
92 .vmap = drm_gem_shmem_vmap,
93 .vunmap = drm_gem_shmem_vunmap,
94 .mmap = &drm_gem_shmem_mmap,
95 };
96
virtio_gpu_create_object(struct drm_device * dev,size_t size)97 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
98 size_t size)
99 {
100 struct virtio_gpu_object *bo;
101
102 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
103 if (!bo)
104 return NULL;
105
106 bo->base.base.funcs = &virtio_gpu_gem_funcs;
107 return &bo->base.base;
108 }
109
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)110 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
111 struct virtio_gpu_object_params *params,
112 struct virtio_gpu_object **bo_ptr,
113 struct virtio_gpu_fence *fence)
114 {
115 struct virtio_gpu_object_array *objs = NULL;
116 struct drm_gem_shmem_object *shmem_obj;
117 struct virtio_gpu_object *bo;
118 int ret;
119
120 *bo_ptr = NULL;
121
122 params->size = roundup(params->size, PAGE_SIZE);
123 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
124 if (IS_ERR(shmem_obj))
125 return PTR_ERR(shmem_obj);
126 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
127
128 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
129 if (ret < 0)
130 goto err_free_gem;
131
132 bo->dumb = params->dumb;
133
134 if (fence) {
135 ret = -ENOMEM;
136 objs = virtio_gpu_array_alloc(1);
137 if (!objs)
138 goto err_put_id;
139 virtio_gpu_array_add_obj(objs, &bo->base.base);
140
141 ret = virtio_gpu_array_lock_resv(objs);
142 if (ret != 0)
143 goto err_put_objs;
144 }
145
146 if (params->virgl) {
147 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
148 objs, fence);
149 } else {
150 virtio_gpu_cmd_create_resource(vgdev, bo, params,
151 objs, fence);
152 }
153
154 ret = virtio_gpu_object_attach(vgdev, bo, NULL);
155 if (ret != 0) {
156 virtio_gpu_free_object(&shmem_obj->base);
157 return ret;
158 }
159
160 *bo_ptr = bo;
161 return 0;
162
163 err_put_objs:
164 virtio_gpu_array_put_free(objs);
165 err_put_id:
166 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
167 err_free_gem:
168 drm_gem_shmem_free_object(&shmem_obj->base);
169 return ret;
170 }
171