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
 38static 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
 61static 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
152static 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
176static 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
193static 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
210long 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
286ioctl_out:
287	DBG("ioctl returns %d\n", ret_val);
288	mutex_unlock(&(agp_fe.agp_mutex));
289	return ret_val;
290}
291