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#include <linux/compat.h>
 33
 34#include <drm/drmP.h>
 35#include <drm/r128_drm.h>
 36#include "r128_drv.h"
 37
 38typedef struct drm_r128_init32 {
 39	int func;
 40	unsigned int sarea_priv_offset;
 41	int is_pci;
 42	int cce_mode;
 43	int cce_secure;
 44	int ring_size;
 45	int usec_timeout;
 46
 47	unsigned int fb_bpp;
 48	unsigned int front_offset, front_pitch;
 49	unsigned int back_offset, back_pitch;
 50	unsigned int depth_bpp;
 51	unsigned int depth_offset, depth_pitch;
 52	unsigned int span_offset;
 53
 54	unsigned int fb_offset;
 55	unsigned int mmio_offset;
 56	unsigned int ring_offset;
 57	unsigned int ring_rptr_offset;
 58	unsigned int buffers_offset;
 59	unsigned int agp_textures_offset;
 60} drm_r128_init32_t;
 61
 62static int compat_r128_init(struct file *file, unsigned int cmd,
 63			    unsigned long arg)
 64{
 65	drm_r128_init32_t init32;
 66	drm_r128_init_t init;
 67
 68	if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
 69		return -EFAULT;
 70
 71	init.func = init32.func;
 72	init.sarea_priv_offset = init32.sarea_priv_offset;
 73	init.is_pci = init32.is_pci;
 74	init.cce_mode = init32.cce_mode;
 75	init.cce_secure = init32.cce_secure;
 76	init.ring_size = init32.ring_size;
 77	init.usec_timeout = init32.usec_timeout;
 78	init.fb_bpp = init32.fb_bpp;
 79	init.front_offset = init32.front_offset;
 80	init.front_pitch = init32.front_pitch;
 81	init.back_offset = init32.back_offset;
 82	init.back_pitch = init32.back_pitch;
 83	init.depth_bpp = init32.depth_bpp;
 84	init.depth_offset = init32.depth_offset;
 85	init.depth_pitch = init32.depth_pitch;
 86	init.span_offset = init32.span_offset;
 87	init.fb_offset = init32.fb_offset;
 88	init.mmio_offset = init32.mmio_offset;
 89	init.ring_offset = init32.ring_offset;
 90	init.ring_rptr_offset = init32.ring_rptr_offset;
 91	init.buffers_offset = init32.buffers_offset;
 92	init.agp_textures_offset = init32.agp_textures_offset;
 93
 94	return drm_ioctl_kernel(file, r128_cce_init, &init,
 95			DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 96}
 97
 98typedef struct drm_r128_depth32 {
 99	int func;
100	int n;
101	u32 x;
102	u32 y;
103	u32 buffer;
104	u32 mask;
105} drm_r128_depth32_t;
106
107static int compat_r128_depth(struct file *file, unsigned int cmd,
108			     unsigned long arg)
109{
110	drm_r128_depth32_t depth32;
111	drm_r128_depth_t depth;
112
113	if (copy_from_user(&depth32, (void __user *)arg, sizeof(depth32)))
114		return -EFAULT;
115
116	depth.func = depth32.func;
117	depth.n = depth32.n;
118	depth.x = compat_ptr(depth32.x);
119	depth.y = compat_ptr(depth32.y);
120	depth.buffer = compat_ptr(depth32.buffer);
121	depth.mask = compat_ptr(depth32.mask);
122
123	return drm_ioctl_kernel(file, r128_cce_depth, &depth, DRM_AUTH);
124}
125
126typedef struct drm_r128_stipple32 {
127	u32 mask;
128} drm_r128_stipple32_t;
129
130static int compat_r128_stipple(struct file *file, unsigned int cmd,
131			       unsigned long arg)
132{
133	drm_r128_stipple32_t stipple32;
134	drm_r128_stipple_t stipple;
135
136	if (copy_from_user(&stipple32, (void __user *)arg, sizeof(stipple32)))
137		return -EFAULT;
138
139	stipple.mask = compat_ptr(stipple32.mask);
140
141	return drm_ioctl_kernel(file, r128_cce_stipple, &stipple, DRM_AUTH);
142}
143
144typedef struct drm_r128_getparam32 {
145	int param;
146	u32 value;
147} drm_r128_getparam32_t;
148
149static int compat_r128_getparam(struct file *file, unsigned int cmd,
150				unsigned long arg)
151{
152	drm_r128_getparam32_t getparam32;
153	drm_r128_getparam_t getparam;
154
155	if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
156		return -EFAULT;
157
158	getparam.param = getparam32.param;
159	getparam.value = compat_ptr(getparam32.value);
160
161	return drm_ioctl_kernel(file, r128_getparam, &getparam, DRM_AUTH);
162}
163
164drm_ioctl_compat_t *r128_compat_ioctls[] = {
165	[DRM_R128_INIT] = compat_r128_init,
166	[DRM_R128_DEPTH] = compat_r128_depth,
167	[DRM_R128_STIPPLE] = compat_r128_stipple,
168	[DRM_R128_GETPARAM] = compat_r128_getparam,
169};
170
171/**
172 * Called whenever a 32-bit process running under a 64-bit kernel
173 * performs an ioctl on /dev/dri/card<n>.
174 *
175 * \param filp file pointer.
176 * \param cmd command.
177 * \param arg user argument.
178 * \return zero on success or negative number on failure.
179 */
180long r128_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
181{
182	unsigned int nr = DRM_IOCTL_NR(cmd);
183	drm_ioctl_compat_t *fn = NULL;
184	int ret;
185
186	if (nr < DRM_COMMAND_BASE)
187		return drm_compat_ioctl(filp, cmd, arg);
188
189	if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(r128_compat_ioctls))
190		fn = r128_compat_ioctls[nr - DRM_COMMAND_BASE];
191
192	if (fn != NULL)
193		ret = (*fn) (filp, cmd, arg);
194	else
195		ret = drm_ioctl(filp, cmd, arg);
196
197	return ret;
198}