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