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 "drmP.h"
 35#include "drm.h"
 36#include "r128_drm.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 __user *init;
 67
 68	if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
 69		return -EFAULT;
 70
 71	init = compat_alloc_user_space(sizeof(*init));
 72	if (!access_ok(VERIFY_WRITE, init, sizeof(*init))
 73	    || __put_user(init32.func, &init->func)
 74	    || __put_user(init32.sarea_priv_offset, &init->sarea_priv_offset)
 75	    || __put_user(init32.is_pci, &init->is_pci)
 76	    || __put_user(init32.cce_mode, &init->cce_mode)
 77	    || __put_user(init32.cce_secure, &init->cce_secure)
 78	    || __put_user(init32.ring_size, &init->ring_size)
 79	    || __put_user(init32.usec_timeout, &init->usec_timeout)
 80	    || __put_user(init32.fb_bpp, &init->fb_bpp)
 81	    || __put_user(init32.front_offset, &init->front_offset)
 82	    || __put_user(init32.front_pitch, &init->front_pitch)
 83	    || __put_user(init32.back_offset, &init->back_offset)
 84	    || __put_user(init32.back_pitch, &init->back_pitch)
 85	    || __put_user(init32.depth_bpp, &init->depth_bpp)
 86	    || __put_user(init32.depth_offset, &init->depth_offset)
 87	    || __put_user(init32.depth_pitch, &init->depth_pitch)
 88	    || __put_user(init32.span_offset, &init->span_offset)
 89	    || __put_user(init32.fb_offset, &init->fb_offset)
 90	    || __put_user(init32.mmio_offset, &init->mmio_offset)
 91	    || __put_user(init32.ring_offset, &init->ring_offset)
 92	    || __put_user(init32.ring_rptr_offset, &init->ring_rptr_offset)
 93	    || __put_user(init32.buffers_offset, &init->buffers_offset)
 94	    || __put_user(init32.agp_textures_offset,
 95			  &init->agp_textures_offset))
 96		return -EFAULT;
 97
 98	return drm_ioctl(file, DRM_IOCTL_R128_INIT, (unsigned long)init);
 99}
100
101typedef struct drm_r128_depth32 {
102	int func;
103	int n;
104	u32 x;
105	u32 y;
106	u32 buffer;
107	u32 mask;
108} drm_r128_depth32_t;
109
110static int compat_r128_depth(struct file *file, unsigned int cmd,
111			     unsigned long arg)
112{
113	drm_r128_depth32_t depth32;
114	drm_r128_depth_t __user *depth;
115
116	if (copy_from_user(&depth32, (void __user *)arg, sizeof(depth32)))
117		return -EFAULT;
118
119	depth = compat_alloc_user_space(sizeof(*depth));
120	if (!access_ok(VERIFY_WRITE, depth, sizeof(*depth))
121	    || __put_user(depth32.func, &depth->func)
122	    || __put_user(depth32.n, &depth->n)
123	    || __put_user((int __user *)(unsigned long)depth32.x, &depth->x)
124	    || __put_user((int __user *)(unsigned long)depth32.y, &depth->y)
125	    || __put_user((unsigned int __user *)(unsigned long)depth32.buffer,
126			  &depth->buffer)
127	    || __put_user((unsigned char __user *)(unsigned long)depth32.mask,
128			  &depth->mask))
129		return -EFAULT;
130
131	return drm_ioctl(file, DRM_IOCTL_R128_DEPTH, (unsigned long)depth);
132
133}
134
135typedef struct drm_r128_stipple32 {
136	u32 mask;
137} drm_r128_stipple32_t;
138
139static int compat_r128_stipple(struct file *file, unsigned int cmd,
140			       unsigned long arg)
141{
142	drm_r128_stipple32_t stipple32;
143	drm_r128_stipple_t __user *stipple;
144
145	if (copy_from_user(&stipple32, (void __user *)arg, sizeof(stipple32)))
146		return -EFAULT;
147
148	stipple = compat_alloc_user_space(sizeof(*stipple));
149	if (!access_ok(VERIFY_WRITE, stipple, sizeof(*stipple))
150	    || __put_user((unsigned int __user *)(unsigned long)stipple32.mask,
151			  &stipple->mask))
152		return -EFAULT;
153
154	return drm_ioctl(file, DRM_IOCTL_R128_STIPPLE, (unsigned long)stipple);
155}
156
157typedef struct drm_r128_getparam32 {
158	int param;
159	u32 value;
160} drm_r128_getparam32_t;
161
162static int compat_r128_getparam(struct file *file, unsigned int cmd,
163				unsigned long arg)
164{
165	drm_r128_getparam32_t getparam32;
166	drm_r128_getparam_t __user *getparam;
167
168	if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
169		return -EFAULT;
170
171	getparam = compat_alloc_user_space(sizeof(*getparam));
172	if (!access_ok(VERIFY_WRITE, getparam, sizeof(*getparam))
173	    || __put_user(getparam32.param, &getparam->param)
174	    || __put_user((void __user *)(unsigned long)getparam32.value,
175			  &getparam->value))
176		return -EFAULT;
177
178	return drm_ioctl(file, DRM_IOCTL_R128_GETPARAM, (unsigned long)getparam);
179}
180
181drm_ioctl_compat_t *r128_compat_ioctls[] = {
182	[DRM_R128_INIT] = compat_r128_init,
183	[DRM_R128_DEPTH] = compat_r128_depth,
184	[DRM_R128_STIPPLE] = compat_r128_stipple,
185	[DRM_R128_GETPARAM] = compat_r128_getparam,
186};
187
188/**
189 * Called whenever a 32-bit process running under a 64-bit kernel
190 * performs an ioctl on /dev/dri/card<n>.
191 *
192 * \param filp file pointer.
193 * \param cmd command.
194 * \param arg user argument.
195 * \return zero on success or negative number on failure.
196 */
197long r128_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
198{
199	unsigned int nr = DRM_IOCTL_NR(cmd);
200	drm_ioctl_compat_t *fn = NULL;
201	int ret;
202
203	if (nr < DRM_COMMAND_BASE)
204		return drm_compat_ioctl(filp, cmd, arg);
205
206	if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(r128_compat_ioctls))
207		fn = r128_compat_ioctls[nr - DRM_COMMAND_BASE];
208
209	if (fn != NULL)
210		ret = (*fn) (filp, cmd, arg);
211	else
212		ret = drm_ioctl(filp, cmd, arg);
213
214	return ret;
215}