drm: add 32/64 support for MGA/R128/i915
[linux-2.6.git] / drivers / char / drm / 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 #include <linux/ioctl32.h>
34
35 #include "drmP.h"
36 #include "drm.h"
37 #include "i915_drm.h"
38
39 typedef struct _drm_i915_batchbuffer32 {
40         int start;              /* agp offset */
41         int used;               /* nr bytes in use */
42         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
43         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
44         int num_cliprects;      /* mulitpass with multiple cliprects? */
45         u32 cliprects;  /* pointer to userspace cliprects */
46 } drm_i915_batchbuffer32_t;
47
48 static int compat_i915_batchbuffer(struct file *file, unsigned int cmd,
49                            unsigned long arg)
50 {
51         drm_i915_batchbuffer32_t batchbuffer32;
52         drm_i915_batchbuffer_t __user *batchbuffer;
53         
54         if (copy_from_user(&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, &batchbuffer->num_cliprects)
64             || __put_user((int __user *)(unsigned long)batchbuffer32.cliprects,
65                           &batchbuffer->cliprects))
66                 return -EFAULT;
67         
68         return drm_ioctl(file->f_dentry->d_inode, file,
69                          DRM_IOCTL_I915_BATCHBUFFER, (unsigned long) batchbuffer);
70 }
71
72 typedef struct _drm_i915_cmdbuffer32 {
73         u32 buf;        /* pointer to userspace command buffer */
74         int sz;                 /* nr bytes in buf */
75         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
76         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
77         int num_cliprects;      /* mulitpass with multiple cliprects? */
78         u32 cliprects;  /* pointer to userspace cliprects */
79 } drm_i915_cmdbuffer32_t;
80
81 static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
82                            unsigned long arg)
83 {
84         drm_i915_cmdbuffer32_t cmdbuffer32;
85         drm_i915_cmdbuffer_t __user *cmdbuffer;
86         
87         if (copy_from_user(&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
88                 return -EFAULT;
89         
90         cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
91         if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
92             || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
93                           &cmdbuffer->buf)
94             || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
95             || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
96             || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
97             || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
98             || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
99                           &cmdbuffer->cliprects))
100                 return -EFAULT;
101         
102         return drm_ioctl(file->f_dentry->d_inode, file,
103                          DRM_IOCTL_I915_CMDBUFFER, (unsigned long) cmdbuffer);
104 }
105
106 typedef struct drm_i915_irq_emit32 {
107         u32 irq_seq;
108 } drm_i915_irq_emit32_t;
109
110 static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
111                                   unsigned long arg)
112 {
113         drm_i915_irq_emit32_t req32;
114         drm_i915_irq_emit_t __user *request;
115
116         if (copy_from_user(&req32, (void __user *) arg, sizeof(req32)))
117                 return -EFAULT;
118
119         request = compat_alloc_user_space(sizeof(*request));
120         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
121             || __put_user((int __user *)(unsigned long)req32.irq_seq,
122                           &request->irq_seq))
123                 return -EFAULT;
124
125         return drm_ioctl(file->f_dentry->d_inode, file,
126                          DRM_IOCTL_I915_IRQ_EMIT, (unsigned long) request);
127 }
128 typedef struct drm_i915_getparam32 {
129         int param;
130         u32 value;
131 } drm_i915_getparam32_t;
132
133 static int compat_i915_getparam(struct file *file, unsigned int cmd,
134                                      unsigned long arg)
135 {
136         drm_i915_getparam32_t req32;
137         drm_i915_getparam_t __user *request;
138
139         if (copy_from_user(&req32, (void __user *) arg, sizeof(req32)))
140                 return -EFAULT;
141
142         request = compat_alloc_user_space(sizeof(*request));
143         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
144             || __put_user(req32.param, &request->param)
145             || __put_user((void __user *)(unsigned long)req32.value,
146                           &request->value))
147                 return -EFAULT;
148
149         return drm_ioctl(file->f_dentry->d_inode, file,
150                          DRM_IOCTL_I915_GETPARAM, (unsigned long) request);
151 }
152
153 typedef struct drm_i915_mem_alloc32 {
154         int region;
155         int alignment;
156         int size;
157         u32 region_offset;      /* offset from start of fb or agp */
158 } drm_i915_mem_alloc32_t;
159
160 static int compat_i915_alloc(struct file *file, unsigned int cmd,
161                                      unsigned long arg)
162 {
163         drm_i915_mem_alloc32_t req32;
164         drm_i915_mem_alloc_t __user *request;
165
166         if (copy_from_user(&req32, (void __user *) arg, sizeof(req32)))
167                 return -EFAULT;
168
169         request = compat_alloc_user_space(sizeof(*request));
170         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
171             || __put_user(req32.region, &request->region)
172             || __put_user(req32.alignment, &request->alignment)
173             || __put_user(req32.size, &request->size)
174             || __put_user((void __user *)(unsigned long)req32.region_offset,
175                           &request->region_offset))
176                 return -EFAULT;
177
178         return drm_ioctl(file->f_dentry->d_inode, file,
179                          DRM_IOCTL_I915_ALLOC, (unsigned long) request);
180 }
181
182
183 drm_ioctl_compat_t *i915_compat_ioctls[] = {
184         [DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
185         [DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
186         [DRM_I915_GETPARAM] = compat_i915_getparam,
187         [DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
188         [DRM_I915_ALLOC] = compat_i915_alloc
189 };
190
191 /**
192  * Called whenever a 32-bit process running under a 64-bit kernel
193  * performs an ioctl on /dev/dri/card<n>.
194  *
195  * \param filp file pointer.
196  * \param cmd command.
197  * \param arg user argument.
198  * \return zero on success or negative number on failure.
199  */
200 long i915_compat_ioctl(struct file *filp, unsigned int cmd,
201                          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)
208                 return drm_compat_ioctl(filp, cmd, arg);
209         
210         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(i915_compat_ioctls))
211                 fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
212
213         lock_kernel();          /* XXX for now */
214         if (fn != NULL)
215                 ret = (*fn)(filp, cmd, arg);
216         else
217                 ret = drm_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
218         unlock_kernel();
219
220         return ret;
221 }