1/**
2 * \file i915_ioc32.c
3 *
4 * 32-bit ioctl compatibility routines for the i915 DRM.
5 *
6 * \author Alan Hourihane <alanh@fairlite.demon.co.uk>
7 *
8 *
9 * Copyright (C) Paul Mackerras 2005
10 * Copyright (C) Alan Hourihane 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/i915_drm.h>
36#include "i915_drv.h"
37
38typedef struct _drm_i915_batchbuffer32 {
39	int start;		/* agp offset */
40	int used;		/* nr bytes in use */
41	int DR1;		/* hw flags for GFX_OP_DRAWRECT_INFO */
42	int DR4;		/* window origin for GFX_OP_DRAWRECT_INFO */
43	int num_cliprects;	/* mulitpass with multiple cliprects? */
44	u32 cliprects;		/* pointer to userspace cliprects */
45} drm_i915_batchbuffer32_t;
46
47static int compat_i915_batchbuffer(struct file *file, unsigned int cmd,
48				   unsigned long arg)
49{
50	drm_i915_batchbuffer32_t batchbuffer32;
51	drm_i915_batchbuffer_t __user *batchbuffer;
52
53	if (copy_from_user
54	    (&batchbuffer32, (void __user *)arg, sizeof(batchbuffer32)))
55		return -EFAULT;
56
57	batchbuffer = compat_alloc_user_space(sizeof(*batchbuffer));
58	if (!access_ok(VERIFY_WRITE, batchbuffer, sizeof(*batchbuffer))
59	    || __put_user(batchbuffer32.start, &batchbuffer->start)
60	    || __put_user(batchbuffer32.used, &batchbuffer->used)
61	    || __put_user(batchbuffer32.DR1, &batchbuffer->DR1)
62	    || __put_user(batchbuffer32.DR4, &batchbuffer->DR4)
63	    || __put_user(batchbuffer32.num_cliprects,
64			  &batchbuffer->num_cliprects)
65	    || __put_user((int __user *)(unsigned long)batchbuffer32.cliprects,
66			  &batchbuffer->cliprects))
67		return -EFAULT;
68
69	return drm_ioctl(file, DRM_IOCTL_I915_BATCHBUFFER,
70			 (unsigned long)batchbuffer);
71}
72
73typedef struct _drm_i915_cmdbuffer32 {
74	u32 buf;		/* pointer to userspace command buffer */
75	int sz;			/* nr bytes in buf */
76	int DR1;		/* hw flags for GFX_OP_DRAWRECT_INFO */
77	int DR4;		/* window origin for GFX_OP_DRAWRECT_INFO */
78	int num_cliprects;	/* mulitpass with multiple cliprects? */
79	u32 cliprects;		/* pointer to userspace cliprects */
80} drm_i915_cmdbuffer32_t;
81
82static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
83				 unsigned long arg)
84{
85	drm_i915_cmdbuffer32_t cmdbuffer32;
86	drm_i915_cmdbuffer_t __user *cmdbuffer;
87
88	if (copy_from_user
89	    (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
90		return -EFAULT;
91
92	cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
93	if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
94	    || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
95			  &cmdbuffer->buf)
96	    || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
97	    || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
98	    || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
99	    || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
100	    || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
101			  &cmdbuffer->cliprects))
102		return -EFAULT;
103
104	return drm_ioctl(file, DRM_IOCTL_I915_CMDBUFFER,
105			 (unsigned long)cmdbuffer);
106}
107
108typedef struct drm_i915_irq_emit32 {
109	u32 irq_seq;
110} drm_i915_irq_emit32_t;
111
112static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
113				unsigned long arg)
114{
115	drm_i915_irq_emit32_t req32;
116	drm_i915_irq_emit_t __user *request;
117
118	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
119		return -EFAULT;
120
121	request = compat_alloc_user_space(sizeof(*request));
122	if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
123	    || __put_user((int __user *)(unsigned long)req32.irq_seq,
124			  &request->irq_seq))
125		return -EFAULT;
126
127	return drm_ioctl(file, DRM_IOCTL_I915_IRQ_EMIT,
128			 (unsigned long)request);
129}
130typedef struct drm_i915_getparam32 {
131	int param;
132	u32 value;
133} drm_i915_getparam32_t;
134
135static int compat_i915_getparam(struct file *file, unsigned int cmd,
136				unsigned long arg)
137{
138	drm_i915_getparam32_t req32;
139	drm_i915_getparam_t __user *request;
140
141	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
142		return -EFAULT;
143
144	request = compat_alloc_user_space(sizeof(*request));
145	if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
146	    || __put_user(req32.param, &request->param)
147	    || __put_user((void __user *)(unsigned long)req32.value,
148			  &request->value))
149		return -EFAULT;
150
151	return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM,
152			 (unsigned long)request);
153}
154
155typedef struct drm_i915_mem_alloc32 {
156	int region;
157	int alignment;
158	int size;
159	u32 region_offset;	/* offset from start of fb or agp */
160} drm_i915_mem_alloc32_t;
161
162static int compat_i915_alloc(struct file *file, unsigned int cmd,
163			     unsigned long arg)
164{
165	drm_i915_mem_alloc32_t req32;
166	drm_i915_mem_alloc_t __user *request;
167
168	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
169		return -EFAULT;
170
171	request = compat_alloc_user_space(sizeof(*request));
172	if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
173	    || __put_user(req32.region, &request->region)
174	    || __put_user(req32.alignment, &request->alignment)
175	    || __put_user(req32.size, &request->size)
176	    || __put_user((void __user *)(unsigned long)req32.region_offset,
177			  &request->region_offset))
178		return -EFAULT;
179
180	return drm_ioctl(file, DRM_IOCTL_I915_ALLOC,
181			 (unsigned long)request);
182}
183
184static drm_ioctl_compat_t *i915_compat_ioctls[] = {
185	[DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
186	[DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
187	[DRM_I915_GETPARAM] = compat_i915_getparam,
188	[DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
189	[DRM_I915_ALLOC] = compat_i915_alloc
190};
191
192/**
193 * Called whenever a 32-bit process running under a 64-bit kernel
194 * performs an ioctl on /dev/dri/card<n>.
195 *
196 * \param filp file pointer.
197 * \param cmd command.
198 * \param arg user argument.
199 * \return zero on success or negative number on failure.
200 */
201long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
202{
203	unsigned int nr = DRM_IOCTL_NR(cmd);
204	drm_ioctl_compat_t *fn = NULL;
205	int ret;
206
207	if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END)
208		return drm_compat_ioctl(filp, cmd, arg);
209
210	if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls))
211		fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
212
213	if (fn != NULL)
214		ret = (*fn) (filp, cmd, arg);
215	else
216		ret = drm_ioctl(filp, cmd, arg);
217
218	return ret;
219}
220