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cc329095 | 1 | /* |
8ca7c1df DA |
2 | * 32-bit ioctl compatibility routines for the i915 DRM. |
3 | * | |
8ca7c1df DA |
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. | |
cc329095 CW |
26 | * |
27 | * Author: Alan Hourihane <alanh@fairlite.demon.co.uk> | |
8ca7c1df DA |
28 | */ |
29 | #include <linux/compat.h> | |
8ca7c1df | 30 | |
760285e7 | 31 | #include <drm/i915_drm.h> |
fcd70cd3 | 32 | #include <drm/drm_ioctl.h> |
c43b5634 | 33 | #include "i915_drv.h" |
8ca7c1df | 34 | |
346add78 SV |
35 | struct drm_i915_getparam32 { |
36 | s32 param; | |
37 | /* | |
38 | * We screwed up the generic ioctl struct here and used a variable-sized | |
39 | * pointer. Use u32 in the compat struct to match the 32bit pointer | |
40 | * userspace expects. | |
41 | */ | |
8ca7c1df | 42 | u32 value; |
346add78 | 43 | }; |
8ca7c1df DA |
44 | |
45 | static int compat_i915_getparam(struct file *file, unsigned int cmd, | |
b5e89ed5 | 46 | unsigned long arg) |
8ca7c1df | 47 | { |
346add78 | 48 | struct drm_i915_getparam32 req32; |
8ca7c1df DA |
49 | drm_i915_getparam_t __user *request; |
50 | ||
b5e89ed5 | 51 | if (copy_from_user(&req32, (void __user *)arg, sizeof(req32))) |
8ca7c1df DA |
52 | return -EFAULT; |
53 | ||
54 | request = compat_alloc_user_space(sizeof(*request)); | |
96d4f267 | 55 | if (!access_ok(request, sizeof(*request)) || |
cc329095 CW |
56 | __put_user(req32.param, &request->param) || |
57 | __put_user((void __user *)(unsigned long)req32.value, | |
58 | &request->value)) | |
8ca7c1df DA |
59 | return -EFAULT; |
60 | ||
ed8b6704 AB |
61 | return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM, |
62 | (unsigned long)request); | |
8ca7c1df DA |
63 | } |
64 | ||
c43b5634 | 65 | static drm_ioctl_compat_t *i915_compat_ioctls[] = { |
8ca7c1df | 66 | [DRM_I915_GETPARAM] = compat_i915_getparam, |
8ca7c1df DA |
67 | }; |
68 | ||
69 | /** | |
cc329095 CW |
70 | * i915_compat_ioctl - handle the mistakes of the past |
71 | * @filp: the file pointer | |
72 | * @cmd: the ioctl command (and encoded flags) | |
73 | * @arg: the ioctl argument (from userspace) | |
74 | * | |
8ca7c1df DA |
75 | * Called whenever a 32-bit process running under a 64-bit kernel |
76 | * performs an ioctl on /dev/dri/card<n>. | |
8ca7c1df | 77 | */ |
b5e89ed5 | 78 | long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
8ca7c1df DA |
79 | { |
80 | unsigned int nr = DRM_IOCTL_NR(cmd); | |
81 | drm_ioctl_compat_t *fn = NULL; | |
82 | int ret; | |
83 | ||
ac7e7ab1 | 84 | if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END) |
8ca7c1df | 85 | return drm_compat_ioctl(filp, cmd, arg); |
b5e89ed5 | 86 | |
f95aeb17 | 87 | if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls)) |
8ca7c1df DA |
88 | fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE]; |
89 | ||
8ca7c1df | 90 | if (fn != NULL) |
b5e89ed5 | 91 | ret = (*fn) (filp, cmd, arg); |
8ca7c1df | 92 | else |
ed8b6704 | 93 | ret = drm_ioctl(filp, cmd, arg); |
8ca7c1df DA |
94 | |
95 | return ret; | |
96 | } |