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_ioc32.h" 35 36 struct drm_i915_getparam32 { 37 s32 param; 38 /* 39 * We screwed up the generic ioctl struct here and used a variable-sized 40 * pointer. Use u32 in the compat struct to match the 32bit pointer 41 * userspace expects. 42 */ 43 u32 value; 44 }; 45 46 static int compat_i915_getparam(struct file *file, unsigned int cmd, 47 unsigned long arg) 48 { 49 struct drm_i915_getparam32 req32; 50 struct drm_i915_getparam req; 51 52 if (copy_from_user(&req32, (void __user *)arg, sizeof(req32))) 53 return -EFAULT; 54 55 req.param = req32.param; 56 req.value = compat_ptr(req32.value); 57 58 return drm_ioctl_kernel(file, i915_getparam_ioctl, &req, 59 DRM_RENDER_ALLOW); 60 } 61 62 static drm_ioctl_compat_t *i915_compat_ioctls[] = { 63 [DRM_I915_GETPARAM] = compat_i915_getparam, 64 }; 65 66 /** 67 * i915_ioc32_compat_ioctl - handle the mistakes of the past 68 * @filp: the file pointer 69 * @cmd: the ioctl command (and encoded flags) 70 * @arg: the ioctl argument (from userspace) 71 * 72 * Called whenever a 32-bit process running under a 64-bit kernel 73 * performs an ioctl on /dev/dri/card<n>. 74 */ 75 long i915_ioc32_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 76 { 77 unsigned int nr = DRM_IOCTL_NR(cmd); 78 drm_ioctl_compat_t *fn = NULL; 79 int ret; 80 81 if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END) 82 return drm_compat_ioctl(filp, cmd, arg); 83 84 if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls)) 85 fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE]; 86 87 if (fn != NULL) 88 ret = (*fn) (filp, cmd, arg); 89 else 90 ret = drm_ioctl(filp, cmd, arg); 91 92 return ret; 93 } 94