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8ca7c1df DA |
1 | /** |
2 | * \file i915_ioc32.c | |
3 | * | |
4 | * 32-bit ioctl compatibility routines for the i915 DRM. | |
5 | * | |
b5e89ed5 | 6 | * \author Alan Hourihane <alanh@fairlite.demon.co.uk> |
8ca7c1df DA |
7 | * |
8 | * | |
9 | * Copyright (C) Paul Mackerras 2005 | |
10 | * Copyright (C) Alan Hourihane 2005 | |
11 | * All Rights Reserved. | |
12 | * | |
13 | * Permission is hereby granted, free of charge, to any person obtaining a | |
14 | * copy of this software and associated documentation files (the "Software"), | |
15 | * to deal in the Software without restriction, including without limitation | |
16 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
17 | * and/or sell copies of the Software, and to permit persons to whom the | |
18 | * Software is furnished to do so, subject to the following conditions: | |
19 | * | |
20 | * The above copyright notice and this permission notice (including the next | |
21 | * paragraph) shall be included in all copies or substantial portions of the | |
22 | * Software. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
26 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
27 | * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
28 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
29 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
30 | * IN THE SOFTWARE. | |
31 | */ | |
32 | #include <linux/compat.h> | |
8ca7c1df | 33 | |
760285e7 DH |
34 | #include <drm/drmP.h> |
35 | #include <drm/i915_drm.h> | |
c43b5634 | 36 | #include "i915_drv.h" |
8ca7c1df | 37 | |
346add78 DV |
38 | struct drm_i915_getparam32 { |
39 | s32 param; | |
40 | /* | |
41 | * We screwed up the generic ioctl struct here and used a variable-sized | |
42 | * pointer. Use u32 in the compat struct to match the 32bit pointer | |
43 | * userspace expects. | |
44 | */ | |
8ca7c1df | 45 | u32 value; |
346add78 | 46 | }; |
8ca7c1df DA |
47 | |
48 | static int compat_i915_getparam(struct file *file, unsigned int cmd, | |
b5e89ed5 | 49 | unsigned long arg) |
8ca7c1df | 50 | { |
346add78 | 51 | struct drm_i915_getparam32 req32; |
8ca7c1df DA |
52 | drm_i915_getparam_t __user *request; |
53 | ||
b5e89ed5 | 54 | if (copy_from_user(&req32, (void __user *)arg, sizeof(req32))) |
8ca7c1df DA |
55 | return -EFAULT; |
56 | ||
57 | request = compat_alloc_user_space(sizeof(*request)); | |
58 | if (!access_ok(VERIFY_WRITE, request, sizeof(*request)) | |
59 | || __put_user(req32.param, &request->param) | |
60 | || __put_user((void __user *)(unsigned long)req32.value, | |
61 | &request->value)) | |
62 | return -EFAULT; | |
63 | ||
ed8b6704 AB |
64 | return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM, |
65 | (unsigned long)request); | |
8ca7c1df DA |
66 | } |
67 | ||
c43b5634 | 68 | static drm_ioctl_compat_t *i915_compat_ioctls[] = { |
8ca7c1df | 69 | [DRM_I915_GETPARAM] = compat_i915_getparam, |
8ca7c1df DA |
70 | }; |
71 | ||
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 | * \param filp file pointer. | |
77 | * \param cmd command. | |
78 | * \param arg user argument. | |
79 | * \return zero on success or negative number on failure. | |
80 | */ | |
b5e89ed5 | 81 | long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
8ca7c1df DA |
82 | { |
83 | unsigned int nr = DRM_IOCTL_NR(cmd); | |
84 | drm_ioctl_compat_t *fn = NULL; | |
85 | int ret; | |
86 | ||
ac7e7ab1 | 87 | if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END) |
8ca7c1df | 88 | return drm_compat_ioctl(filp, cmd, arg); |
b5e89ed5 | 89 | |
f95aeb17 | 90 | if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls)) |
8ca7c1df DA |
91 | fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE]; |
92 | ||
8ca7c1df | 93 | if (fn != NULL) |
b5e89ed5 | 94 | ret = (*fn) (filp, cmd, arg); |
8ca7c1df | 95 | else |
ed8b6704 | 96 | ret = drm_ioctl(filp, cmd, arg); |
8ca7c1df DA |
97 | |
98 | return ret; | |
99 | } |