1 | /* |
2 | * Copyright 2011 Red Hat, Inc. |
3 | * Copyright © 2014 The Chromium OS Authors |
4 | * |
5 | * Permission is hereby granted, free of charge, to any person obtaining a |
6 | * copy of this software and associated documentation files (the "Software") |
7 | * to deal in the software without restriction, including without limitation |
8 | * on the rights to use, copy, modify, merge, publish, distribute, sub |
9 | * license, and/or sell copies of the Software, and to permit persons to whom |
10 | * them Software is furnished to do so, subject to the following conditions: |
11 | * |
12 | * The above copyright notice and this permission notice (including the next |
13 | * paragraph) shall be included in all copies or substantial portions of the |
14 | * Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
19 | * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER |
20 | * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN |
21 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
22 | * |
23 | * Authors: |
24 | * Adam Jackson <ajax@redhat.com> |
25 | * Ben Widawsky <ben@bwidawsk.net> |
26 | */ |
27 | |
28 | /* |
29 | * This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's |
30 | * software renderer and the X server for efficient buffer sharing. |
31 | */ |
32 | |
33 | #include <linux/dma-buf.h> |
34 | #include <linux/module.h> |
35 | #include <linux/platform_device.h> |
36 | #include <linux/shmem_fs.h> |
37 | #include <linux/vmalloc.h> |
38 | |
39 | #include <drm/drm_drv.h> |
40 | #include <drm/drm_file.h> |
41 | #include <drm/drm_gem_shmem_helper.h> |
42 | #include <drm/drm_ioctl.h> |
43 | #include <drm/drm_managed.h> |
44 | #include <drm/drm_prime.h> |
45 | |
46 | #include "vgem_drv.h" |
47 | |
48 | #define DRIVER_NAME "vgem" |
49 | #define DRIVER_DESC "Virtual GEM provider" |
50 | #define DRIVER_DATE "20120112" |
51 | #define DRIVER_MAJOR 1 |
52 | #define DRIVER_MINOR 0 |
53 | |
54 | static struct vgem_device { |
55 | struct drm_device drm; |
56 | struct platform_device *platform; |
57 | } *vgem_device; |
58 | |
59 | static int vgem_open(struct drm_device *dev, struct drm_file *file) |
60 | { |
61 | struct vgem_file *vfile; |
62 | int ret; |
63 | |
64 | vfile = kzalloc(size: sizeof(*vfile), GFP_KERNEL); |
65 | if (!vfile) |
66 | return -ENOMEM; |
67 | |
68 | file->driver_priv = vfile; |
69 | |
70 | ret = vgem_fence_open(file: vfile); |
71 | if (ret) { |
72 | kfree(objp: vfile); |
73 | return ret; |
74 | } |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | static void vgem_postclose(struct drm_device *dev, struct drm_file *file) |
80 | { |
81 | struct vgem_file *vfile = file->driver_priv; |
82 | |
83 | vgem_fence_close(file: vfile); |
84 | kfree(objp: vfile); |
85 | } |
86 | |
87 | static struct drm_ioctl_desc vgem_ioctls[] = { |
88 | DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW), |
89 | DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW), |
90 | }; |
91 | |
92 | DEFINE_DRM_GEM_FOPS(vgem_driver_fops); |
93 | |
94 | static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, size_t size) |
95 | { |
96 | struct drm_gem_shmem_object *obj; |
97 | |
98 | obj = kzalloc(size: sizeof(*obj), GFP_KERNEL); |
99 | if (!obj) |
100 | return ERR_PTR(error: -ENOMEM); |
101 | |
102 | /* |
103 | * vgem doesn't have any begin/end cpu access ioctls, therefore must use |
104 | * coherent memory or dma-buf sharing just wont work. |
105 | */ |
106 | obj->map_wc = true; |
107 | |
108 | return &obj->base; |
109 | } |
110 | |
111 | static const struct drm_driver vgem_driver = { |
112 | .driver_features = DRIVER_GEM | DRIVER_RENDER, |
113 | .open = vgem_open, |
114 | .postclose = vgem_postclose, |
115 | .ioctls = vgem_ioctls, |
116 | .num_ioctls = ARRAY_SIZE(vgem_ioctls), |
117 | .fops = &vgem_driver_fops, |
118 | |
119 | DRM_GEM_SHMEM_DRIVER_OPS, |
120 | .gem_create_object = vgem_gem_create_object, |
121 | |
122 | .name = DRIVER_NAME, |
123 | .desc = DRIVER_DESC, |
124 | .date = DRIVER_DATE, |
125 | .major = DRIVER_MAJOR, |
126 | .minor = DRIVER_MINOR, |
127 | }; |
128 | |
129 | static int __init vgem_init(void) |
130 | { |
131 | int ret; |
132 | struct platform_device *pdev; |
133 | |
134 | pdev = platform_device_register_simple(name: "vgem" , id: -1, NULL, num: 0); |
135 | if (IS_ERR(ptr: pdev)) |
136 | return PTR_ERR(ptr: pdev); |
137 | |
138 | if (!devres_open_group(dev: &pdev->dev, NULL, GFP_KERNEL)) { |
139 | ret = -ENOMEM; |
140 | goto out_unregister; |
141 | } |
142 | |
143 | dma_coerce_mask_and_coherent(dev: &pdev->dev, |
144 | DMA_BIT_MASK(64)); |
145 | |
146 | vgem_device = devm_drm_dev_alloc(&pdev->dev, &vgem_driver, |
147 | struct vgem_device, drm); |
148 | if (IS_ERR(ptr: vgem_device)) { |
149 | ret = PTR_ERR(ptr: vgem_device); |
150 | goto out_devres; |
151 | } |
152 | vgem_device->platform = pdev; |
153 | |
154 | /* Final step: expose the device/driver to userspace */ |
155 | ret = drm_dev_register(dev: &vgem_device->drm, flags: 0); |
156 | if (ret) |
157 | goto out_devres; |
158 | |
159 | return 0; |
160 | |
161 | out_devres: |
162 | devres_release_group(dev: &pdev->dev, NULL); |
163 | out_unregister: |
164 | platform_device_unregister(pdev); |
165 | return ret; |
166 | } |
167 | |
168 | static void __exit vgem_exit(void) |
169 | { |
170 | struct platform_device *pdev = vgem_device->platform; |
171 | |
172 | drm_dev_unregister(dev: &vgem_device->drm); |
173 | devres_release_group(dev: &pdev->dev, NULL); |
174 | platform_device_unregister(pdev); |
175 | } |
176 | |
177 | module_init(vgem_init); |
178 | module_exit(vgem_exit); |
179 | |
180 | MODULE_AUTHOR("Red Hat, Inc." ); |
181 | MODULE_AUTHOR("Intel Corporation" ); |
182 | MODULE_DESCRIPTION(DRIVER_DESC); |
183 | MODULE_LICENSE("GPL and additional rights" ); |
184 | |