96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/*
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* 32-bit ioctl compatibility routines for the i915 DRM.
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*
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* Copyright (C) Paul Mackerras 2005
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* Copyright (C) Alan Hourihane 2005
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Author: Alan Hourihane <alanh@fairlite.demon.co.uk>
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*/
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#include <linux/compat.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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struct drm_i915_getparam32 {
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s32 param;
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/*
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* We screwed up the generic ioctl struct here and used a variable-sized
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* pointer. Use u32 in the compat struct to match the 32bit pointer
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* userspace expects.
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*/
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u32 value;
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};
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static int compat_i915_getparam(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct drm_i915_getparam32 req32;
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drm_i915_getparam_t __user *request;
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if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(request, sizeof(*request)) ||
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__put_user(req32.param, &request->param) ||
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__put_user((void __user *)(unsigned long)req32.value,
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&request->value))
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return -EFAULT;
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return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM,
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(unsigned long)request);
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}
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static drm_ioctl_compat_t *i915_compat_ioctls[] = {
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[DRM_I915_GETPARAM] = compat_i915_getparam,
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};
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/**
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* i915_compat_ioctl - handle the mistakes of the past
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* @filp: the file pointer
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* @cmd: the ioctl command (and encoded flags)
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* @arg: the ioctl argument (from userspace)
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*
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* Called whenever a 32-bit process running under a 64-bit kernel
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* performs an ioctl on /dev/dri/card<n>.
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*/
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long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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unsigned int nr = DRM_IOCTL_NR(cmd);
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drm_ioctl_compat_t *fn = NULL;
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int ret;
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if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END)
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return drm_compat_ioctl(filp, cmd, arg);
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if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls))
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fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
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if (fn != NULL)
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ret = (*fn) (filp, cmd, arg);
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else
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ret = drm_ioctl(filp, cmd, arg);
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return ret;
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}
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