1/**
  2 * \file r128_ioc32.c
  3 *
  4 * 32-bit ioctl compatibility routines for the R128 DRM.
  5 *
  6 * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
  7 *
  8 * Copyright (C) Paul Mackerras 2005
  9 * Copyright (C) Egbert Eich 2003,2004
 10 * Copyright (C) Dave Airlie 2005
 11 * All Rights Reserved.
 12 *
 13 * Permission is hereby granted, free of charge, to any person obtaining a
 14 * copy of this software and associated documentation files (the "Software"),
 15 * to deal in the Software without restriction, including without limitation
 16 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 17 * and/or sell copies of the Software, and to permit persons to whom the
 18 * Software is furnished to do so, subject to the following conditions:
 19 *
 20 * The above copyright notice and this permission notice (including the next
 21 * paragraph) shall be included in all copies or substantial portions of the
 22 * Software.
 23 *
 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 27 * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 28 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 30 * IN THE SOFTWARE.
 31 */
 32
 33#include <linux/compat.h>
 34
 35#include <drm/r128_drm.h>
 36
 37#include "r128_drv.h"
 38
 39typedef struct drm_r128_init32 {
 40	int func;
 41	unsigned int sarea_priv_offset;
 42	int is_pci;
 43	int cce_mode;
 44	int cce_secure;
 45	int ring_size;
 46	int usec_timeout;
 47
 48	unsigned int fb_bpp;
 49	unsigned int front_offset, front_pitch;
 50	unsigned int back_offset, back_pitch;
 51	unsigned int depth_bpp;
 52	unsigned int depth_offset, depth_pitch;
 53	unsigned int span_offset;
 54
 55	unsigned int fb_offset;
 56	unsigned int mmio_offset;
 57	unsigned int ring_offset;
 58	unsigned int ring_rptr_offset;
 59	unsigned int buffers_offset;
 60	unsigned int agp_textures_offset;
 61} drm_r128_init32_t;
 62
 63static int compat_r128_init(struct file *file, unsigned int cmd,
 64			    unsigned long arg)
 65{
 66	drm_r128_init32_t init32;
 67	drm_r128_init_t init;
 68
 69	if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
 70		return -EFAULT;
 71
 72	init.func = init32.func;
 73	init.sarea_priv_offset = init32.sarea_priv_offset;
 74	init.is_pci = init32.is_pci;
 75	init.cce_mode = init32.cce_mode;
 76	init.cce_secure = init32.cce_secure;
 77	init.ring_size = init32.ring_size;
 78	init.usec_timeout = init32.usec_timeout;
 79	init.fb_bpp = init32.fb_bpp;
 80	init.front_offset = init32.front_offset;
 81	init.front_pitch = init32.front_pitch;
 82	init.back_offset = init32.back_offset;
 83	init.back_pitch = init32.back_pitch;
 84	init.depth_bpp = init32.depth_bpp;
 85	init.depth_offset = init32.depth_offset;
 86	init.depth_pitch = init32.depth_pitch;
 87	init.span_offset = init32.span_offset;
 88	init.fb_offset = init32.fb_offset;
 89	init.mmio_offset = init32.mmio_offset;
 90	init.ring_offset = init32.ring_offset;
 91	init.ring_rptr_offset = init32.ring_rptr_offset;
 92	init.buffers_offset = init32.buffers_offset;
 93	init.agp_textures_offset = init32.agp_textures_offset;
 94
 95	return drm_ioctl_kernel(file, r128_cce_init, &init,
 96			DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 97}
 98
 99typedef struct drm_r128_depth32 {
100	int func;
101	int n;
102	u32 x;
103	u32 y;
104	u32 buffer;
105	u32 mask;
106} drm_r128_depth32_t;
107
108static int compat_r128_depth(struct file *file, unsigned int cmd,
109			     unsigned long arg)
110{
111	drm_r128_depth32_t depth32;
112	drm_r128_depth_t depth;
113
114	if (copy_from_user(&depth32, (void __user *)arg, sizeof(depth32)))
115		return -EFAULT;
116
117	depth.func = depth32.func;
118	depth.n = depth32.n;
119	depth.x = compat_ptr(depth32.x);
120	depth.y = compat_ptr(depth32.y);
121	depth.buffer = compat_ptr(depth32.buffer);
122	depth.mask = compat_ptr(depth32.mask);
123
124	return drm_ioctl_kernel(file, r128_cce_depth, &depth, DRM_AUTH);
125}
126
127typedef struct drm_r128_stipple32 {
128	u32 mask;
129} drm_r128_stipple32_t;
130
131static int compat_r128_stipple(struct file *file, unsigned int cmd,
132			       unsigned long arg)
133{
134	drm_r128_stipple32_t stipple32;
135	drm_r128_stipple_t stipple;
136
137	if (copy_from_user(&stipple32, (void __user *)arg, sizeof(stipple32)))
138		return -EFAULT;
139
140	stipple.mask = compat_ptr(stipple32.mask);
141
142	return drm_ioctl_kernel(file, r128_cce_stipple, &stipple, DRM_AUTH);
143}
144
145typedef struct drm_r128_getparam32 {
146	int param;
147	u32 value;
148} drm_r128_getparam32_t;
149
150static int compat_r128_getparam(struct file *file, unsigned int cmd,
151				unsigned long arg)
152{
153	drm_r128_getparam32_t getparam32;
154	drm_r128_getparam_t getparam;
155
156	if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
157		return -EFAULT;
158
159	getparam.param = getparam32.param;
160	getparam.value = compat_ptr(getparam32.value);
161
162	return drm_ioctl_kernel(file, r128_getparam, &getparam, DRM_AUTH);
163}
164
165drm_ioctl_compat_t *r128_compat_ioctls[] = {
166	[DRM_R128_INIT] = compat_r128_init,
167	[DRM_R128_DEPTH] = compat_r128_depth,
168	[DRM_R128_STIPPLE] = compat_r128_stipple,
169	[DRM_R128_GETPARAM] = compat_r128_getparam,
170};
171
172/**
173 * Called whenever a 32-bit process running under a 64-bit kernel
174 * performs an ioctl on /dev/dri/card<n>.
175 *
176 * \param filp file pointer.
177 * \param cmd command.
178 * \param arg user argument.
179 * \return zero on success or negative number on failure.
180 */
181long r128_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
182{
183	unsigned int nr = DRM_IOCTL_NR(cmd);
184	drm_ioctl_compat_t *fn = NULL;
185	int ret;
186
187	if (nr < DRM_COMMAND_BASE)
188		return drm_compat_ioctl(filp, cmd, arg);
189
190	if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(r128_compat_ioctls))
191		fn = r128_compat_ioctls[nr - DRM_COMMAND_BASE];
192
193	if (fn != NULL)
194		ret = (*fn) (filp, cmd, arg);
195	else
196		ret = drm_ioctl(filp, cmd, arg);
197
198	return ret;
199}