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1/*2 * 32-bit ioctl compatibility routines for the i915 DRM.3 *4 * Copyright (C) Paul Mackerras 20055 * Copyright (C) Alan Hourihane 20056 * All Rights Reserved.7 *8 * Permission is hereby granted, free of charge, to any person obtaining a9 * copy of this software and associated documentation files (the "Software"),10 * to deal in the Software without restriction, including without limitation11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,12 * and/or sell copies of the Software, and to permit persons to whom the13 * Software is furnished to do so, subject to the following conditions:14 *15 * The above copyright notice and this permission notice (including the next16 * paragraph) shall be included in all copies or substantial portions of the17 * Software.18 *19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL22 * 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 DEALINGS25 * 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 37struct drm_i915_getparam32 {38 s32 param;39 /*40 * We screwed up the generic ioctl struct here and used a variable-sized41 * pointer. Use u32 in the compat struct to match the 32bit pointer42 * userspace expects.43 */44 u32 value;45};46 47static 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(&req32, (void __user *)arg, sizeof(req32)))54 return -EFAULT;55 56 req.param = req32.param;57 req.value = compat_ptr(req32.value);58 59 return drm_ioctl_kernel(file, i915_getparam_ioctl, &req,60 DRM_RENDER_ALLOW);61}62 63static 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 past69 * @filp: the file pointer70 * @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 kernel74 * performs an ioctl on /dev/dri/card<n>.75 */76long 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 else91 ret = drm_ioctl(filp, cmd, arg);92 93 return ret;94}95