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/moduleparam.h>
27 
28 #include "virtgpu_drv.h"
29 
30 static int virtio_gpu_virglrenderer_workaround = 1;
31 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
32 
33 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
34 				       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 
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 
64 static void virtio_gpu_free_object(struct drm_gem_object *obj)
65 {
66 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
67 	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
68 
69 	if (bo->pages)
70 		virtio_gpu_object_detach(vgdev, bo);
71 	if (bo->created)
72 		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
73 	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
74 
75 	drm_gem_shmem_free_object(obj);
76 }
77 
78 static const struct drm_gem_object_funcs virtio_gpu_gem_funcs = {
79 	.free = virtio_gpu_free_object,
80 	.open = virtio_gpu_gem_object_open,
81 	.close = virtio_gpu_gem_object_close,
82 
83 	.print_info = drm_gem_shmem_print_info,
84 	.pin = drm_gem_shmem_pin,
85 	.unpin = drm_gem_shmem_unpin,
86 	.get_sg_table = drm_gem_shmem_get_sg_table,
87 	.vmap = drm_gem_shmem_vmap,
88 	.vunmap = drm_gem_shmem_vunmap,
89 	.mmap = &drm_gem_shmem_mmap,
90 };
91 
92 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
93 						size_t size)
94 {
95 	struct virtio_gpu_object *bo;
96 
97 	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
98 	if (!bo)
99 		return NULL;
100 
101 	bo->base.base.funcs = &virtio_gpu_gem_funcs;
102 	bo->base.map_cached = true;
103 	return &bo->base.base;
104 }
105 
106 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
107 			     struct virtio_gpu_object_params *params,
108 			     struct virtio_gpu_object **bo_ptr,
109 			     struct virtio_gpu_fence *fence)
110 {
111 	struct virtio_gpu_object_array *objs = NULL;
112 	struct drm_gem_shmem_object *shmem_obj;
113 	struct virtio_gpu_object *bo;
114 	int ret;
115 
116 	*bo_ptr = NULL;
117 
118 	params->size = roundup(params->size, PAGE_SIZE);
119 	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
120 	if (IS_ERR(shmem_obj))
121 		return PTR_ERR(shmem_obj);
122 	bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
123 
124 	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
125 	if (ret < 0)
126 		goto err_free_gem;
127 
128 	bo->dumb = params->dumb;
129 
130 	if (fence) {
131 		ret = -ENOMEM;
132 		objs = virtio_gpu_array_alloc(1);
133 		if (!objs)
134 			goto err_put_id;
135 		virtio_gpu_array_add_obj(objs, &bo->base.base);
136 
137 		ret = virtio_gpu_array_lock_resv(objs);
138 		if (ret != 0)
139 			goto err_put_objs;
140 	}
141 
142 	if (params->virgl) {
143 		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
144 						  objs, fence);
145 	} else {
146 		virtio_gpu_cmd_create_resource(vgdev, bo, params,
147 					       objs, fence);
148 	}
149 
150 	ret = virtio_gpu_object_attach(vgdev, bo, NULL);
151 	if (ret != 0) {
152 		virtio_gpu_free_object(&shmem_obj->base);
153 		return ret;
154 	}
155 
156 	*bo_ptr = bo;
157 	return 0;
158 
159 err_put_objs:
160 	virtio_gpu_array_put_free(objs);
161 err_put_id:
162 	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
163 err_free_gem:
164 	drm_gem_shmem_free_object(&shmem_obj->base);
165 	return ret;
166 }
167