Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[linux-2.6] / drivers / gpu / drm / i915 / i915_ioc32.c
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 "drmP.h"
35 #include "drm.h"
36 #include "i915_drm.h"
37
38 typedef 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
47 static 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->f_path.dentry->d_inode, file,
70                          DRM_IOCTL_I915_BATCHBUFFER,
71                          (unsigned long)batchbuffer);
72 }
73
74 typedef struct _drm_i915_cmdbuffer32 {
75         u32 buf;                /* pointer to userspace command buffer */
76         int sz;                 /* nr bytes in buf */
77         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
78         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
79         int num_cliprects;      /* mulitpass with multiple cliprects? */
80         u32 cliprects;          /* pointer to userspace cliprects */
81 } drm_i915_cmdbuffer32_t;
82
83 static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
84                                  unsigned long arg)
85 {
86         drm_i915_cmdbuffer32_t cmdbuffer32;
87         drm_i915_cmdbuffer_t __user *cmdbuffer;
88
89         if (copy_from_user
90             (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
91                 return -EFAULT;
92
93         cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
94         if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
95             || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
96                           &cmdbuffer->buf)
97             || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
98             || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
99             || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
100             || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
101             || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
102                           &cmdbuffer->cliprects))
103                 return -EFAULT;
104
105         return drm_ioctl(file->f_path.dentry->d_inode, file,
106                          DRM_IOCTL_I915_CMDBUFFER, (unsigned long)cmdbuffer);
107 }
108
109 typedef struct drm_i915_irq_emit32 {
110         u32 irq_seq;
111 } drm_i915_irq_emit32_t;
112
113 static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
114                                 unsigned long arg)
115 {
116         drm_i915_irq_emit32_t req32;
117         drm_i915_irq_emit_t __user *request;
118
119         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
120                 return -EFAULT;
121
122         request = compat_alloc_user_space(sizeof(*request));
123         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
124             || __put_user((int __user *)(unsigned long)req32.irq_seq,
125                           &request->irq_seq))
126                 return -EFAULT;
127
128         return drm_ioctl(file->f_path.dentry->d_inode, file,
129                          DRM_IOCTL_I915_IRQ_EMIT, (unsigned long)request);
130 }
131 typedef struct drm_i915_getparam32 {
132         int param;
133         u32 value;
134 } drm_i915_getparam32_t;
135
136 static int compat_i915_getparam(struct file *file, unsigned int cmd,
137                                 unsigned long arg)
138 {
139         drm_i915_getparam32_t req32;
140         drm_i915_getparam_t __user *request;
141
142         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
143                 return -EFAULT;
144
145         request = compat_alloc_user_space(sizeof(*request));
146         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
147             || __put_user(req32.param, &request->param)
148             || __put_user((void __user *)(unsigned long)req32.value,
149                           &request->value))
150                 return -EFAULT;
151
152         return drm_ioctl(file->f_path.dentry->d_inode, file,
153                          DRM_IOCTL_I915_GETPARAM, (unsigned long)request);
154 }
155
156 typedef struct drm_i915_mem_alloc32 {
157         int region;
158         int alignment;
159         int size;
160         u32 region_offset;      /* offset from start of fb or agp */
161 } drm_i915_mem_alloc32_t;
162
163 static int compat_i915_alloc(struct file *file, unsigned int cmd,
164                              unsigned long arg)
165 {
166         drm_i915_mem_alloc32_t req32;
167         drm_i915_mem_alloc_t __user *request;
168
169         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
170                 return -EFAULT;
171
172         request = compat_alloc_user_space(sizeof(*request));
173         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
174             || __put_user(req32.region, &request->region)
175             || __put_user(req32.alignment, &request->alignment)
176             || __put_user(req32.size, &request->size)
177             || __put_user((void __user *)(unsigned long)req32.region_offset,
178                           &request->region_offset))
179                 return -EFAULT;
180
181         return drm_ioctl(file->f_path.dentry->d_inode, file,
182                          DRM_IOCTL_I915_ALLOC, (unsigned long)request);
183 }
184
185 drm_ioctl_compat_t *i915_compat_ioctls[] = {
186         [DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
187         [DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
188         [DRM_I915_GETPARAM] = compat_i915_getparam,
189         [DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
190         [DRM_I915_ALLOC] = compat_i915_alloc
191 };
192
193 /**
194  * Called whenever a 32-bit process running under a 64-bit kernel
195  * performs an ioctl on /dev/dri/card<n>.
196  *
197  * \param filp file pointer.
198  * \param cmd command.
199  * \param arg user argument.
200  * \return zero on success or negative number on failure.
201  */
202 long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
203 {
204         unsigned int nr = DRM_IOCTL_NR(cmd);
205         drm_ioctl_compat_t *fn = NULL;
206         int ret;
207
208         if (nr < DRM_COMMAND_BASE)
209                 return drm_compat_ioctl(filp, cmd, arg);
210
211         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(i915_compat_ioctls))
212                 fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
213
214         lock_kernel();          /* XXX for now */
215         if (fn != NULL)
216                 ret = (*fn) (filp, cmd, arg);
217         else
218                 ret = drm_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
219         unlock_kernel();
220
221         return ret;
222 }