xref: /openbmc/linux/drivers/char/agp/compat_ioctl.c (revision 6da2ec56)
1 /*
2  * AGPGART driver frontend compatibility ioctls
3  * Copyright (C) 2004 Silicon Graphics, Inc.
4  * Copyright (C) 2002-2003 Dave Jones
5  * Copyright (C) 1999 Jeff Hartmann
6  * Copyright (C) 1999 Precision Insight, Inc.
7  * Copyright (C) 1999 Xi Graphics, Inc.
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included
17  * in all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26  *
27  */
28 
29 #include <linux/kernel.h>
30 #include <linux/pci.h>
31 #include <linux/fs.h>
32 #include <linux/agpgart.h>
33 #include <linux/slab.h>
34 #include <linux/uaccess.h>
35 #include "agp.h"
36 #include "compat_ioctl.h"
37 
compat_agpioc_info_wrap(struct agp_file_private * priv,void __user * arg)38 static int compat_agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
39 {
40 	struct agp_info32 userinfo;
41 	struct agp_kern_info kerninfo;
42 
43 	agp_copy_info(agp_bridge, &kerninfo);
44 
45 	userinfo.version.major = kerninfo.version.major;
46 	userinfo.version.minor = kerninfo.version.minor;
47 	userinfo.bridge_id = kerninfo.device->vendor |
48 	    (kerninfo.device->device << 16);
49 	userinfo.agp_mode = kerninfo.mode;
50 	userinfo.aper_base = (compat_long_t)kerninfo.aper_base;
51 	userinfo.aper_size = kerninfo.aper_size;
52 	userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
53 	userinfo.pg_used = kerninfo.current_memory;
54 
55 	if (copy_to_user(arg, &userinfo, sizeof(userinfo)))
56 		return -EFAULT;
57 
58 	return 0;
59 }
60 
compat_agpioc_reserve_wrap(struct agp_file_private * priv,void __user * arg)61 static int compat_agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
62 {
63 	struct agp_region32 ureserve;
64 	struct agp_region kreserve;
65 	struct agp_client *client;
66 	struct agp_file_private *client_priv;
67 
68 	DBG("");
69 	if (copy_from_user(&ureserve, arg, sizeof(ureserve)))
70 		return -EFAULT;
71 
72 	if ((unsigned) ureserve.seg_count >= ~0U/sizeof(struct agp_segment32))
73 		return -EFAULT;
74 
75 	kreserve.pid = ureserve.pid;
76 	kreserve.seg_count = ureserve.seg_count;
77 
78 	client = agp_find_client_by_pid(kreserve.pid);
79 
80 	if (kreserve.seg_count == 0) {
81 		/* remove a client */
82 		client_priv = agp_find_private(kreserve.pid);
83 
84 		if (client_priv != NULL) {
85 			set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
86 			set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
87 		}
88 		if (client == NULL) {
89 			/* client is already removed */
90 			return 0;
91 		}
92 		return agp_remove_client(kreserve.pid);
93 	} else {
94 		struct agp_segment32 *usegment;
95 		struct agp_segment *ksegment;
96 		int seg;
97 
98 		if (ureserve.seg_count >= 16384)
99 			return -EINVAL;
100 
101 		usegment = kmalloc_array(ureserve.seg_count,
102 					 sizeof(*usegment),
103 					 GFP_KERNEL);
104 		if (!usegment)
105 			return -ENOMEM;
106 
107 		ksegment = kmalloc_array(kreserve.seg_count,
108 					 sizeof(*ksegment),
109 					 GFP_KERNEL);
110 		if (!ksegment) {
111 			kfree(usegment);
112 			return -ENOMEM;
113 		}
114 
115 		if (copy_from_user(usegment, (void __user *) ureserve.seg_list,
116 				   sizeof(*usegment) * ureserve.seg_count)) {
117 			kfree(usegment);
118 			kfree(ksegment);
119 			return -EFAULT;
120 		}
121 
122 		for (seg = 0; seg < ureserve.seg_count; seg++) {
123 			ksegment[seg].pg_start = usegment[seg].pg_start;
124 			ksegment[seg].pg_count = usegment[seg].pg_count;
125 			ksegment[seg].prot = usegment[seg].prot;
126 		}
127 
128 		kfree(usegment);
129 		kreserve.seg_list = ksegment;
130 
131 		if (client == NULL) {
132 			/* Create the client and add the segment */
133 			client = agp_create_client(kreserve.pid);
134 
135 			if (client == NULL) {
136 				kfree(ksegment);
137 				return -ENOMEM;
138 			}
139 			client_priv = agp_find_private(kreserve.pid);
140 
141 			if (client_priv != NULL) {
142 				set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
143 				set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
144 			}
145 		}
146 		return agp_create_segment(client, &kreserve);
147 	}
148 	/* Will never really happen */
149 	return -EINVAL;
150 }
151 
compat_agpioc_allocate_wrap(struct agp_file_private * priv,void __user * arg)152 static int compat_agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
153 {
154 	struct agp_memory *memory;
155 	struct agp_allocate32 alloc;
156 
157 	DBG("");
158 	if (copy_from_user(&alloc, arg, sizeof(alloc)))
159 		return -EFAULT;
160 
161 	memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
162 
163 	if (memory == NULL)
164 		return -ENOMEM;
165 
166 	alloc.key = memory->key;
167 	alloc.physical = memory->physical;
168 
169 	if (copy_to_user(arg, &alloc, sizeof(alloc))) {
170 		agp_free_memory_wrap(memory);
171 		return -EFAULT;
172 	}
173 	return 0;
174 }
175 
compat_agpioc_bind_wrap(struct agp_file_private * priv,void __user * arg)176 static int compat_agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
177 {
178 	struct agp_bind32 bind_info;
179 	struct agp_memory *memory;
180 
181 	DBG("");
182 	if (copy_from_user(&bind_info, arg, sizeof(bind_info)))
183 		return -EFAULT;
184 
185 	memory = agp_find_mem_by_key(bind_info.key);
186 
187 	if (memory == NULL)
188 		return -EINVAL;
189 
190 	return agp_bind_memory(memory, bind_info.pg_start);
191 }
192 
compat_agpioc_unbind_wrap(struct agp_file_private * priv,void __user * arg)193 static int compat_agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
194 {
195 	struct agp_memory *memory;
196 	struct agp_unbind32 unbind;
197 
198 	DBG("");
199 	if (copy_from_user(&unbind, arg, sizeof(unbind)))
200 		return -EFAULT;
201 
202 	memory = agp_find_mem_by_key(unbind.key);
203 
204 	if (memory == NULL)
205 		return -EINVAL;
206 
207 	return agp_unbind_memory(memory);
208 }
209 
compat_agp_ioctl(struct file * file,unsigned int cmd,unsigned long arg)210 long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
211 {
212 	struct agp_file_private *curr_priv = file->private_data;
213 	int ret_val = -ENOTTY;
214 
215 	mutex_lock(&(agp_fe.agp_mutex));
216 
217 	if ((agp_fe.current_controller == NULL) &&
218 	    (cmd != AGPIOC_ACQUIRE32)) {
219 		ret_val = -EINVAL;
220 		goto ioctl_out;
221 	}
222 	if ((agp_fe.backend_acquired != true) &&
223 	    (cmd != AGPIOC_ACQUIRE32)) {
224 		ret_val = -EBUSY;
225 		goto ioctl_out;
226 	}
227 	if (cmd != AGPIOC_ACQUIRE32) {
228 		if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
229 			ret_val = -EPERM;
230 			goto ioctl_out;
231 		}
232 		/* Use the original pid of the controller,
233 		 * in case it's threaded */
234 
235 		if (agp_fe.current_controller->pid != curr_priv->my_pid) {
236 			ret_val = -EBUSY;
237 			goto ioctl_out;
238 		}
239 	}
240 
241 	switch (cmd) {
242 	case AGPIOC_INFO32:
243 		ret_val = compat_agpioc_info_wrap(curr_priv, (void __user *) arg);
244 		break;
245 
246 	case AGPIOC_ACQUIRE32:
247 		ret_val = agpioc_acquire_wrap(curr_priv);
248 		break;
249 
250 	case AGPIOC_RELEASE32:
251 		ret_val = agpioc_release_wrap(curr_priv);
252 		break;
253 
254 	case AGPIOC_SETUP32:
255 		ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
256 		break;
257 
258 	case AGPIOC_RESERVE32:
259 		ret_val = compat_agpioc_reserve_wrap(curr_priv, (void __user *) arg);
260 		break;
261 
262 	case AGPIOC_PROTECT32:
263 		ret_val = agpioc_protect_wrap(curr_priv);
264 		break;
265 
266 	case AGPIOC_ALLOCATE32:
267 		ret_val = compat_agpioc_allocate_wrap(curr_priv, (void __user *) arg);
268 		break;
269 
270 	case AGPIOC_DEALLOCATE32:
271 		ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
272 		break;
273 
274 	case AGPIOC_BIND32:
275 		ret_val = compat_agpioc_bind_wrap(curr_priv, (void __user *) arg);
276 		break;
277 
278 	case AGPIOC_UNBIND32:
279 		ret_val = compat_agpioc_unbind_wrap(curr_priv, (void __user *) arg);
280 		break;
281 
282 	case AGPIOC_CHIPSET_FLUSH32:
283 		break;
284 	}
285 
286 ioctl_out:
287 	DBG("ioctl returns %d\n", ret_val);
288 	mutex_unlock(&(agp_fe.agp_mutex));
289 	return ret_val;
290 }
291 
292