1 /* $NetBSD: mga_ioc32.c,v 1.3 2021/12/18 23:45:32 riastradh Exp $ */
2
3 /**
4 * \file mga_ioc32.c
5 *
6 * 32-bit ioctl compatibility routines for the MGA DRM.
7 *
8 * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
9 *
10 *
11 * Copyright (C) Paul Mackerras 2005
12 * Copyright (C) Egbert Eich 2003,2004
13 * Copyright (C) Dave Airlie 2005
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
31 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
32 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
33 * IN THE SOFTWARE.
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: mga_ioc32.c,v 1.3 2021/12/18 23:45:32 riastradh Exp $");
38
39 #include <linux/compat.h>
40
41 #include "mga_drv.h"
42
43 typedef struct drm32_mga_init {
44 int func;
45 u32 sarea_priv_offset;
46 int chipset;
47 int sgram;
48 unsigned int maccess;
49 unsigned int fb_cpp;
50 unsigned int front_offset, front_pitch;
51 unsigned int back_offset, back_pitch;
52 unsigned int depth_cpp;
53 unsigned int depth_offset, depth_pitch;
54 unsigned int texture_offset[MGA_NR_TEX_HEAPS];
55 unsigned int texture_size[MGA_NR_TEX_HEAPS];
56 u32 fb_offset;
57 u32 mmio_offset;
58 u32 status_offset;
59 u32 warp_offset;
60 u32 primary_offset;
61 u32 buffers_offset;
62 } drm_mga_init32_t;
63
compat_mga_init(struct file * file,unsigned int cmd,unsigned long arg)64 static int compat_mga_init(struct file *file, unsigned int cmd,
65 unsigned long arg)
66 {
67 drm_mga_init32_t init32;
68 drm_mga_init_t init;
69
70 if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
71 return -EFAULT;
72
73 init.func = init32.func;
74 init.sarea_priv_offset = init32.sarea_priv_offset;
75 memcpy(&init.chipset, &init32.chipset,
76 offsetof(drm_mga_init_t, fb_offset) -
77 offsetof(drm_mga_init_t, chipset));
78 init.fb_offset = init32.fb_offset;
79 init.mmio_offset = init32.mmio_offset;
80 init.status_offset = init32.status_offset;
81 init.warp_offset = init32.warp_offset;
82 init.primary_offset = init32.primary_offset;
83 init.buffers_offset = init32.buffers_offset;
84
85 return drm_ioctl_kernel(file, mga_dma_init, &init,
86 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
87 }
88
89 typedef struct drm_mga_getparam32 {
90 int param;
91 u32 value;
92 } drm_mga_getparam32_t;
93
compat_mga_getparam(struct file * file,unsigned int cmd,unsigned long arg)94 static int compat_mga_getparam(struct file *file, unsigned int cmd,
95 unsigned long arg)
96 {
97 drm_mga_getparam32_t getparam32;
98 drm_mga_getparam_t getparam;
99
100 if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
101 return -EFAULT;
102
103 getparam.param = getparam32.param;
104 getparam.value = compat_ptr(getparam32.value);
105 return drm_ioctl_kernel(file, mga_getparam, &getparam, DRM_AUTH);
106 }
107
108 typedef struct drm_mga_drm_bootstrap32 {
109 u32 texture_handle;
110 u32 texture_size;
111 u32 primary_size;
112 u32 secondary_bin_count;
113 u32 secondary_bin_size;
114 u32 agp_mode;
115 u8 agp_size;
116 } drm_mga_dma_bootstrap32_t;
117
compat_mga_dma_bootstrap(struct file * file,unsigned int cmd,unsigned long arg)118 static int compat_mga_dma_bootstrap(struct file *file, unsigned int cmd,
119 unsigned long arg)
120 {
121 drm_mga_dma_bootstrap32_t dma_bootstrap32;
122 drm_mga_dma_bootstrap_t dma_bootstrap;
123 int err;
124
125 if (copy_from_user(&dma_bootstrap32, (void __user *)arg,
126 sizeof(dma_bootstrap32)))
127 return -EFAULT;
128
129 dma_bootstrap.texture_handle = dma_bootstrap32.texture_handle;
130 dma_bootstrap.texture_size = dma_bootstrap32.texture_size;
131 dma_bootstrap.primary_size = dma_bootstrap32.primary_size;
132 dma_bootstrap.secondary_bin_count = dma_bootstrap32.secondary_bin_count;
133 dma_bootstrap.secondary_bin_size = dma_bootstrap32.secondary_bin_size;
134 dma_bootstrap.agp_mode = dma_bootstrap32.agp_mode;
135 dma_bootstrap.agp_size = dma_bootstrap32.agp_size;
136
137 err = drm_ioctl_kernel(file, mga_dma_bootstrap, &dma_bootstrap,
138 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
139 if (err)
140 return err;
141
142 dma_bootstrap32.texture_handle = dma_bootstrap.texture_handle;
143 dma_bootstrap32.texture_size = dma_bootstrap.texture_size;
144 dma_bootstrap32.primary_size = dma_bootstrap.primary_size;
145 dma_bootstrap32.secondary_bin_count = dma_bootstrap.secondary_bin_count;
146 dma_bootstrap32.secondary_bin_size = dma_bootstrap.secondary_bin_size;
147 dma_bootstrap32.agp_mode = dma_bootstrap.agp_mode;
148 dma_bootstrap32.agp_size = dma_bootstrap.agp_size;
149 if (copy_to_user((void __user *)arg, &dma_bootstrap32,
150 sizeof(dma_bootstrap32)))
151 return -EFAULT;
152
153 return 0;
154 }
155
156 static struct {
157 drm_ioctl_compat_t *fn;
158 char *name;
159 } mga_compat_ioctls[] = {
160 #define DRM_IOCTL32_DEF(n, f)[DRM_##n] = {.fn = f, .name = #n}
161 DRM_IOCTL32_DEF(MGA_INIT, compat_mga_init),
162 DRM_IOCTL32_DEF(MGA_GETPARAM, compat_mga_getparam),
163 DRM_IOCTL32_DEF(MGA_DMA_BOOTSTRAP, compat_mga_dma_bootstrap),
164 };
165
166 /**
167 * Called whenever a 32-bit process running under a 64-bit kernel
168 * performs an ioctl on /dev/dri/card<n>.
169 *
170 * \param filp file pointer.
171 * \param cmd command.
172 * \param arg user argument.
173 * \return zero on success or negative number on failure.
174 */
mga_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)175 long mga_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
176 {
177 unsigned int nr = DRM_IOCTL_NR(cmd);
178 struct drm_file *file_priv = filp->private_data;
179 drm_ioctl_compat_t *fn = NULL;
180 int ret;
181
182 if (nr < DRM_COMMAND_BASE)
183 return drm_compat_ioctl(filp, cmd, arg);
184
185 if (nr >= DRM_COMMAND_BASE + ARRAY_SIZE(mga_compat_ioctls))
186 return drm_ioctl(filp, cmd, arg);
187
188 fn = mga_compat_ioctls[nr - DRM_COMMAND_BASE].fn;
189 if (!fn)
190 return drm_ioctl(filp, cmd, arg);
191
192 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
193 task_pid_nr(current),
194 (long)old_encode_dev(file_priv->minor->kdev->devt),
195 file_priv->authenticated,
196 mga_compat_ioctls[nr - DRM_COMMAND_BASE].name);
197 ret = (*fn) (filp, cmd, arg);
198 if (ret)
199 DRM_DEBUG("ret = %d\n", ret);
200 return ret;
201 }
202