1 | /* |
2 | * 32-bit ioctl compatibility routines for the i915 DRM. |
3 | * |
4 | * Copyright (C) Paul Mackerras 2005 |
5 | * Copyright (C) Alan Hourihane 2005 |
6 | * All Rights Reserved. |
7 | * |
8 | * Permission is hereby granted, free of charge, to any person obtaining a |
9 | * copy of this software and associated documentation files (the "Software"), |
10 | * to deal in the Software without restriction, including without limitation |
11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
12 | * and/or sell copies of the Software, and to permit persons to whom the |
13 | * Software is furnished to do so, subject to the following conditions: |
14 | * |
15 | * The above copyright notice and this permission notice (including the next |
16 | * paragraph) shall be included in all copies or substantial portions of the |
17 | * Software. |
18 | * |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
22 | * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
23 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
24 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
25 | * IN THE SOFTWARE. |
26 | * |
27 | * Author: Alan Hourihane <alanh@fairlite.demon.co.uk> |
28 | */ |
29 | #include <linux/compat.h> |
30 | |
31 | #include <drm/drm_ioctl.h> |
32 | |
33 | #include "i915_drv.h" |
34 | #include "i915_getparam.h" |
35 | #include "i915_ioc32.h" |
36 | |
37 | struct drm_i915_getparam32 { |
38 | s32 param; |
39 | /* |
40 | * We screwed up the generic ioctl struct here and used a variable-sized |
41 | * pointer. Use u32 in the compat struct to match the 32bit pointer |
42 | * userspace expects. |
43 | */ |
44 | u32 value; |
45 | }; |
46 | |
47 | static int compat_i915_getparam(struct file *file, unsigned int cmd, |
48 | unsigned long arg) |
49 | { |
50 | struct drm_i915_getparam32 req32; |
51 | struct drm_i915_getparam req; |
52 | |
53 | if (copy_from_user(to: &req32, from: (void __user *)arg, n: sizeof(req32))) |
54 | return -EFAULT; |
55 | |
56 | req.param = req32.param; |
57 | req.value = compat_ptr(uptr: req32.value); |
58 | |
59 | return drm_ioctl_kernel(file, i915_getparam_ioctl, &req, |
60 | DRM_RENDER_ALLOW); |
61 | } |
62 | |
63 | static drm_ioctl_compat_t *i915_compat_ioctls[] = { |
64 | [DRM_I915_GETPARAM] = compat_i915_getparam, |
65 | }; |
66 | |
67 | /** |
68 | * i915_ioc32_compat_ioctl - handle the mistakes of the past |
69 | * @filp: the file pointer |
70 | * @cmd: the ioctl command (and encoded flags) |
71 | * @arg: the ioctl argument (from userspace) |
72 | * |
73 | * Called whenever a 32-bit process running under a 64-bit kernel |
74 | * performs an ioctl on /dev/dri/card<n>. |
75 | */ |
76 | long i915_ioc32_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
77 | { |
78 | unsigned int nr = DRM_IOCTL_NR(cmd); |
79 | drm_ioctl_compat_t *fn = NULL; |
80 | int ret; |
81 | |
82 | if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END) |
83 | return drm_compat_ioctl(filp, cmd, arg); |
84 | |
85 | if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls)) |
86 | fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE]; |
87 | |
88 | if (fn != NULL) |
89 | ret = (*fn) (filp, cmd, arg); |
90 | else |
91 | ret = drm_ioctl(filp, cmd, arg); |
92 | |
93 | return ret; |
94 | } |
95 | |