1 /*
2  * \file mga_ioc32.c
3  *
4  * 32-bit ioctl compatibility routines for the MGA DRM.
5  *
6  * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
7  *
8  *
9  * Copyright (C) Paul Mackerras 2005
10  * Copyright (C) Egbert Eich 2003,2004
11  * Copyright (C) Dave Airlie 2005
12  * All Rights Reserved.
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a
15  * copy of this software and associated documentation files (the "Software"),
16  * to deal in the Software without restriction, including without limitation
17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18  * and/or sell copies of the Software, and to permit persons to whom the
19  * Software is furnished to do so, subject to the following conditions:
20  *
21  * The above copyright notice and this permission notice (including the next
22  * paragraph) shall be included in all copies or substantial portions of the
23  * Software.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
28  * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
29  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
30  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31  * IN THE SOFTWARE.
32  */
33 
34 #include <linux/compat.h>
35 
36 #include "mga_drv.h"
37 
38 typedef struct drm32_mga_init {
39 	int func;
40 	u32 sarea_priv_offset;
41 	struct_group(always32bit,
42 		int chipset;
43 		int sgram;
44 		unsigned int maccess;
45 		unsigned int fb_cpp;
46 		unsigned int front_offset, front_pitch;
47 		unsigned int back_offset, back_pitch;
48 		unsigned int depth_cpp;
49 		unsigned int depth_offset, depth_pitch;
50 		unsigned int texture_offset[MGA_NR_TEX_HEAPS];
51 		unsigned int texture_size[MGA_NR_TEX_HEAPS];
52 	);
53 	u32 fb_offset;
54 	u32 mmio_offset;
55 	u32 status_offset;
56 	u32 warp_offset;
57 	u32 primary_offset;
58 	u32 buffers_offset;
59 } drm_mga_init32_t;
60 
compat_mga_init(struct file * file,unsigned int cmd,unsigned long arg)61 static int compat_mga_init(struct file *file, unsigned int cmd,
62 			   unsigned long arg)
63 {
64 	drm_mga_init32_t init32;
65 	drm_mga_init_t init;
66 
67 	if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
68 		return -EFAULT;
69 
70 	init.func = init32.func;
71 	init.sarea_priv_offset = init32.sarea_priv_offset;
72 	memcpy(&init.always32bit, &init32.always32bit,
73 	       sizeof(init32.always32bit));
74 	init.fb_offset = init32.fb_offset;
75 	init.mmio_offset = init32.mmio_offset;
76 	init.status_offset = init32.status_offset;
77 	init.warp_offset = init32.warp_offset;
78 	init.primary_offset = init32.primary_offset;
79 	init.buffers_offset = init32.buffers_offset;
80 
81 	return drm_ioctl_kernel(file, mga_dma_init, &init,
82 				DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
83 }
84 
85 typedef struct drm_mga_getparam32 {
86 	int param;
87 	u32 value;
88 } drm_mga_getparam32_t;
89 
compat_mga_getparam(struct file * file,unsigned int cmd,unsigned long arg)90 static int compat_mga_getparam(struct file *file, unsigned int cmd,
91 			       unsigned long arg)
92 {
93 	drm_mga_getparam32_t getparam32;
94 	drm_mga_getparam_t getparam;
95 
96 	if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
97 		return -EFAULT;
98 
99 	getparam.param = getparam32.param;
100 	getparam.value = compat_ptr(getparam32.value);
101 	return drm_ioctl_kernel(file, mga_getparam, &getparam, DRM_AUTH);
102 }
103 
104 typedef struct drm_mga_drm_bootstrap32 {
105 	u32 texture_handle;
106 	u32 texture_size;
107 	u32 primary_size;
108 	u32 secondary_bin_count;
109 	u32 secondary_bin_size;
110 	u32 agp_mode;
111 	u8 agp_size;
112 } drm_mga_dma_bootstrap32_t;
113 
compat_mga_dma_bootstrap(struct file * file,unsigned int cmd,unsigned long arg)114 static int compat_mga_dma_bootstrap(struct file *file, unsigned int cmd,
115 				    unsigned long arg)
116 {
117 	drm_mga_dma_bootstrap32_t dma_bootstrap32;
118 	drm_mga_dma_bootstrap_t dma_bootstrap;
119 	int err;
120 
121 	if (copy_from_user(&dma_bootstrap32, (void __user *)arg,
122 			   sizeof(dma_bootstrap32)))
123 		return -EFAULT;
124 
125 	dma_bootstrap.texture_handle = dma_bootstrap32.texture_handle;
126 	dma_bootstrap.texture_size = dma_bootstrap32.texture_size;
127 	dma_bootstrap.primary_size = dma_bootstrap32.primary_size;
128 	dma_bootstrap.secondary_bin_count = dma_bootstrap32.secondary_bin_count;
129 	dma_bootstrap.secondary_bin_size = dma_bootstrap32.secondary_bin_size;
130 	dma_bootstrap.agp_mode = dma_bootstrap32.agp_mode;
131 	dma_bootstrap.agp_size = dma_bootstrap32.agp_size;
132 
133 	err = drm_ioctl_kernel(file, mga_dma_bootstrap, &dma_bootstrap,
134 				DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
135 	if (err)
136 		return err;
137 
138 	dma_bootstrap32.texture_handle = dma_bootstrap.texture_handle;
139 	dma_bootstrap32.texture_size = dma_bootstrap.texture_size;
140 	dma_bootstrap32.primary_size = dma_bootstrap.primary_size;
141 	dma_bootstrap32.secondary_bin_count = dma_bootstrap.secondary_bin_count;
142 	dma_bootstrap32.secondary_bin_size = dma_bootstrap.secondary_bin_size;
143 	dma_bootstrap32.agp_mode = dma_bootstrap.agp_mode;
144 	dma_bootstrap32.agp_size = dma_bootstrap.agp_size;
145 	if (copy_to_user((void __user *)arg, &dma_bootstrap32,
146 			 sizeof(dma_bootstrap32)))
147 		return -EFAULT;
148 
149 	return 0;
150 }
151 
152 static struct {
153 	drm_ioctl_compat_t *fn;
154 	char *name;
155 } mga_compat_ioctls[] = {
156 #define DRM_IOCTL32_DEF(n, f)[DRM_##n] = {.fn = f, .name = #n}
157 	DRM_IOCTL32_DEF(MGA_INIT, compat_mga_init),
158 	DRM_IOCTL32_DEF(MGA_GETPARAM, compat_mga_getparam),
159 	DRM_IOCTL32_DEF(MGA_DMA_BOOTSTRAP, compat_mga_dma_bootstrap),
160 };
161 
162 /**
163  * mga_compat_ioctl - Called whenever a 32-bit process running under
164  *                    a 64-bit kernel performs an ioctl on /dev/dri/card<n>.
165  *
166  * @filp: file pointer.
167  * @cmd:  command.
168  * @arg:  user argument.
169  * return: zero on success or negative number on failure.
170  */
mga_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)171 long mga_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
172 {
173 	unsigned int nr = DRM_IOCTL_NR(cmd);
174 	struct drm_file *file_priv = filp->private_data;
175 	drm_ioctl_compat_t *fn = NULL;
176 	int ret;
177 
178 	if (nr < DRM_COMMAND_BASE)
179 		return drm_compat_ioctl(filp, cmd, arg);
180 
181 	if (nr >= DRM_COMMAND_BASE + ARRAY_SIZE(mga_compat_ioctls))
182 		return drm_ioctl(filp, cmd, arg);
183 
184 	fn = mga_compat_ioctls[nr - DRM_COMMAND_BASE].fn;
185 	if (!fn)
186 		return drm_ioctl(filp, cmd, arg);
187 
188 	DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
189 		  task_pid_nr(current),
190 		  (long)old_encode_dev(file_priv->minor->kdev->devt),
191 		  file_priv->authenticated,
192 		  mga_compat_ioctls[nr - DRM_COMMAND_BASE].name);
193 	ret = (*fn) (filp, cmd, arg);
194 	if (ret)
195 		DRM_DEBUG("ret = %d\n", ret);
196 	return ret;
197 }
198