cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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i915_ioc32.c (2948B)

      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
     37struct 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
     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 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 */
     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	else
     91		ret = drm_ioctl(filp, cmd, arg);
     92
     93	return ret;
     94}