1 /******************************************************************************
2  *
3  * Module Name: utaddress - op_region address range check
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2012, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acnamesp.h"
47 
48 #define _COMPONENT          ACPI_UTILITIES
49 ACPI_MODULE_NAME("utaddress")
50 
51 /*******************************************************************************
52  *
53  * FUNCTION:    acpi_ut_add_address_range
54  *
55  * PARAMETERS:  space_id            - Address space ID
56  *              Address             - op_region start address
57  *              Length              - op_region length
58  *              region_node         - op_region namespace node
59  *
60  * RETURN:      Status
61  *
62  * DESCRIPTION: Add the Operation Region address range to the global list.
63  *              The only supported Space IDs are Memory and I/O. Called when
64  *              the op_region address/length operands are fully evaluated.
65  *
66  * MUTEX:       Locks the namespace
67  *
68  * NOTE: Because this interface is only called when an op_region argument
69  * list is evaluated, there cannot be any duplicate region_nodes.
70  * Duplicate Address/Length values are allowed, however, so that multiple
71  * address conflicts can be detected.
72  *
73  ******************************************************************************/
74 acpi_status
acpi_ut_add_address_range(acpi_adr_space_type space_id,acpi_physical_address address,u32 length,struct acpi_namespace_node * region_node)75 acpi_ut_add_address_range(acpi_adr_space_type space_id,
76 			  acpi_physical_address address,
77 			  u32 length, struct acpi_namespace_node *region_node)
78 {
79 	struct acpi_address_range *range_info;
80 	acpi_status status;
81 
82 	ACPI_FUNCTION_TRACE(ut_add_address_range);
83 
84 	if ((space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
85 	    (space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
86 		return_ACPI_STATUS(AE_OK);
87 	}
88 
89 	/* Allocate/init a new info block, add it to the appropriate list */
90 
91 	range_info = ACPI_ALLOCATE(sizeof(struct acpi_address_range));
92 	if (!range_info) {
93 		return_ACPI_STATUS(AE_NO_MEMORY);
94 	}
95 
96 	range_info->start_address = address;
97 	range_info->end_address = (address + length - 1);
98 	range_info->region_node = region_node;
99 
100 	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
101 	if (ACPI_FAILURE(status)) {
102 		ACPI_FREE(range_info);
103 		return_ACPI_STATUS(status);
104 	}
105 
106 	range_info->next = acpi_gbl_address_range_list[space_id];
107 	acpi_gbl_address_range_list[space_id] = range_info;
108 
109 	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
110 			  "\nAdded [%4.4s] address range: 0x%p-0x%p\n",
111 			  acpi_ut_get_node_name(range_info->region_node),
112 			  ACPI_CAST_PTR(void, address),
113 			  ACPI_CAST_PTR(void, range_info->end_address)));
114 
115 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
116 	return_ACPI_STATUS(AE_OK);
117 }
118 
119 /*******************************************************************************
120  *
121  * FUNCTION:    acpi_ut_remove_address_range
122  *
123  * PARAMETERS:  space_id            - Address space ID
124  *              region_node         - op_region namespace node
125  *
126  * RETURN:      None
127  *
128  * DESCRIPTION: Remove the Operation Region from the global list. The only
129  *              supported Space IDs are Memory and I/O. Called when an
130  *              op_region is deleted.
131  *
132  * MUTEX:       Assumes the namespace is locked
133  *
134  ******************************************************************************/
135 
136 void
acpi_ut_remove_address_range(acpi_adr_space_type space_id,struct acpi_namespace_node * region_node)137 acpi_ut_remove_address_range(acpi_adr_space_type space_id,
138 			     struct acpi_namespace_node *region_node)
139 {
140 	struct acpi_address_range *range_info;
141 	struct acpi_address_range *prev;
142 
143 	ACPI_FUNCTION_TRACE(ut_remove_address_range);
144 
145 	if ((space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
146 	    (space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
147 		return_VOID;
148 	}
149 
150 	/* Get the appropriate list head and check the list */
151 
152 	range_info = prev = acpi_gbl_address_range_list[space_id];
153 	while (range_info) {
154 		if (range_info->region_node == region_node) {
155 			if (range_info == prev) {	/* Found at list head */
156 				acpi_gbl_address_range_list[space_id] =
157 				    range_info->next;
158 			} else {
159 				prev->next = range_info->next;
160 			}
161 
162 			ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
163 					  "\nRemoved [%4.4s] address range: 0x%p-0x%p\n",
164 					  acpi_ut_get_node_name(range_info->
165 								region_node),
166 					  ACPI_CAST_PTR(void,
167 							range_info->
168 							start_address),
169 					  ACPI_CAST_PTR(void,
170 							range_info->
171 							end_address)));
172 
173 			ACPI_FREE(range_info);
174 			return_VOID;
175 		}
176 
177 		prev = range_info;
178 		range_info = range_info->next;
179 	}
180 
181 	return_VOID;
182 }
183 
184 /*******************************************************************************
185  *
186  * FUNCTION:    acpi_ut_check_address_range
187  *
188  * PARAMETERS:  space_id            - Address space ID
189  *              Address             - Start address
190  *              Length              - Length of address range
191  *              Warn                - TRUE if warning on overlap desired
192  *
193  * RETURN:      Count of the number of conflicts detected. Zero is always
194  *              returned for Space IDs other than Memory or I/O.
195  *
196  * DESCRIPTION: Check if the input address range overlaps any of the
197  *              ASL operation region address ranges. The only supported
198  *              Space IDs are Memory and I/O.
199  *
200  * MUTEX:       Assumes the namespace is locked.
201  *
202  ******************************************************************************/
203 
204 u32
acpi_ut_check_address_range(acpi_adr_space_type space_id,acpi_physical_address address,u32 length,u8 warn)205 acpi_ut_check_address_range(acpi_adr_space_type space_id,
206 			    acpi_physical_address address, u32 length, u8 warn)
207 {
208 	struct acpi_address_range *range_info;
209 	acpi_physical_address end_address;
210 	char *pathname;
211 	u32 overlap_count = 0;
212 
213 	ACPI_FUNCTION_TRACE(ut_check_address_range);
214 
215 	if ((space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
216 	    (space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
217 		return_UINT32(0);
218 	}
219 
220 	range_info = acpi_gbl_address_range_list[space_id];
221 	end_address = address + length - 1;
222 
223 	/* Check entire list for all possible conflicts */
224 
225 	while (range_info) {
226 		/*
227 		 * Check if the requested Address/Length overlaps this address_range.
228 		 * Four cases to consider:
229 		 *
230 		 * 1) Input address/length is contained completely in the address range
231 		 * 2) Input address/length overlaps range at the range start
232 		 * 3) Input address/length overlaps range at the range end
233 		 * 4) Input address/length completely encompasses the range
234 		 */
235 		if ((address <= range_info->end_address) &&
236 		    (end_address >= range_info->start_address)) {
237 
238 			/* Found an address range overlap */
239 
240 			overlap_count++;
241 			if (warn) {	/* Optional warning message */
242 				pathname =
243 				    acpi_ns_get_external_pathname(range_info->
244 								  region_node);
245 
246 				ACPI_WARNING((AE_INFO,
247 					      "0x%p-0x%p %s conflicts with Region %s %d",
248 					      ACPI_CAST_PTR(void, address),
249 					      ACPI_CAST_PTR(void, end_address),
250 					      acpi_ut_get_region_name(space_id),
251 					      pathname, overlap_count));
252 				ACPI_FREE(pathname);
253 			}
254 		}
255 
256 		range_info = range_info->next;
257 	}
258 
259 	return_UINT32(overlap_count);
260 }
261 
262 /*******************************************************************************
263  *
264  * FUNCTION:    acpi_ut_delete_address_lists
265  *
266  * PARAMETERS:  None
267  *
268  * RETURN:      None
269  *
270  * DESCRIPTION: Delete all global address range lists (called during
271  *              subsystem shutdown).
272  *
273  ******************************************************************************/
274 
acpi_ut_delete_address_lists(void)275 void acpi_ut_delete_address_lists(void)
276 {
277 	struct acpi_address_range *next;
278 	struct acpi_address_range *range_info;
279 	int i;
280 
281 	/* Delete all elements in all address range lists */
282 
283 	for (i = 0; i < ACPI_ADDRESS_RANGE_MAX; i++) {
284 		next = acpi_gbl_address_range_list[i];
285 
286 		while (next) {
287 			range_info = next;
288 			next = range_info->next;
289 			ACPI_FREE(range_info);
290 		}
291 
292 		acpi_gbl_address_range_list[i] = NULL;
293 	}
294 }
295