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1 : : // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 : : /*******************************************************************************
3 : : *
4 : : * Module Name: nseval - Object evaluation, includes control method execution
5 : : *
6 : : ******************************************************************************/
7 : :
8 : : #include <acpi/acpi.h>
9 : : #include "accommon.h"
10 : : #include "acparser.h"
11 : : #include "acinterp.h"
12 : : #include "acnamesp.h"
13 : :
14 : : #define _COMPONENT ACPI_NAMESPACE
15 : : ACPI_MODULE_NAME("nseval")
16 : :
17 : : /*******************************************************************************
18 : : *
19 : : * FUNCTION: acpi_ns_evaluate
20 : : *
21 : : * PARAMETERS: info - Evaluation info block, contains these fields
22 : : * and more:
23 : : * prefix_node - Prefix or Method/Object Node to execute
24 : : * relative_path - Name of method to execute, If NULL, the
25 : : * Node is the object to execute
26 : : * parameters - List of parameters to pass to the method,
27 : : * terminated by NULL. Params itself may be
28 : : * NULL if no parameters are being passed.
29 : : * parameter_type - Type of Parameter list
30 : : * return_object - Where to put method's return value (if
31 : : * any). If NULL, no value is returned.
32 : : * flags - ACPI_IGNORE_RETURN_VALUE to delete return
33 : : *
34 : : * RETURN: Status
35 : : *
36 : : * DESCRIPTION: Execute a control method or return the current value of an
37 : : * ACPI namespace object.
38 : : *
39 : : * MUTEX: Locks interpreter
40 : : *
41 : : ******************************************************************************/
42 : 52416 : acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info)
43 : : {
44 : 52416 : acpi_status status;
45 : :
46 : 52416 : ACPI_FUNCTION_TRACE(ns_evaluate);
47 : :
48 [ + - ]: 52416 : if (!info) {
49 : : return_ACPI_STATUS(AE_BAD_PARAMETER);
50 : : }
51 : :
52 [ + - ]: 52416 : if (!info->node) {
53 : : /*
54 : : * Get the actual namespace node for the target object if we
55 : : * need to. Handles these cases:
56 : : *
57 : : * 1) Null node, valid pathname from root (absolute path)
58 : : * 2) Node and valid pathname (path relative to Node)
59 : : * 3) Node, Null pathname
60 : : */
61 : 52416 : status =
62 : 52416 : acpi_ns_get_node(info->prefix_node, info->relative_pathname,
63 : : ACPI_NS_NO_UPSEARCH, &info->node);
64 [ + + ]: 52416 : if (ACPI_FAILURE(status)) {
65 : : return_ACPI_STATUS(status);
66 : : }
67 : : }
68 : :
69 : : /*
70 : : * For a method alias, we must grab the actual method node so that
71 : : * proper scoping context will be established before execution.
72 : : */
73 [ - + ]: 12873 : if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
74 : 0 : info->node =
75 : 0 : ACPI_CAST_PTR(struct acpi_namespace_node,
76 : : info->node->object);
77 : : }
78 : :
79 : : /* Complete the info block initialization */
80 : :
81 : 12873 : info->return_object = NULL;
82 : 12873 : info->node_flags = info->node->flags;
83 : 12873 : info->obj_desc = acpi_ns_get_attached_object(info->node);
84 : :
85 : : ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
86 : : info->relative_pathname, info->node,
87 : 12873 : acpi_ns_get_attached_object(info->node)));
88 : :
89 : : /* Get info if we have a predefined name (_HID, etc.) */
90 : :
91 : 25746 : info->predefined =
92 : 12873 : acpi_ut_match_predefined_method(info->node->name.ascii);
93 : :
94 : : /* Get the full pathname to the object, for use in warning messages */
95 : :
96 : 12873 : info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
97 [ + - ]: 12873 : if (!info->full_pathname) {
98 : : return_ACPI_STATUS(AE_NO_MEMORY);
99 : : }
100 : :
101 : : /* Optional object evaluation log */
102 : :
103 : : ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
104 : : "%-26s: %s (%s)\n", " Enter evaluation",
105 : : &info->full_pathname[1],
106 : 12873 : acpi_ut_get_type_name(info->node->type)));
107 : :
108 : : /* Count the number of arguments being passed in */
109 : :
110 : 12873 : info->param_count = 0;
111 [ + + ]: 12873 : if (info->parameters) {
112 [ + + ]: 42 : while (info->parameters[info->param_count]) {
113 : 21 : info->param_count++;
114 : : }
115 : :
116 : : /* Warn on impossible argument count */
117 : :
118 [ - + ]: 21 : if (info->param_count > ACPI_METHOD_NUM_ARGS) {
119 : 0 : ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
120 : : ACPI_WARN_ALWAYS,
121 : : "Excess arguments (%u) - using only %u",
122 : : info->param_count,
123 : : ACPI_METHOD_NUM_ARGS));
124 : :
125 : 0 : info->param_count = ACPI_METHOD_NUM_ARGS;
126 : : }
127 : : }
128 : :
129 : : /*
130 : : * For predefined names: Check that the declared argument count
131 : : * matches the ACPI spec -- otherwise this is a BIOS error.
132 : : */
133 : 12873 : acpi_ns_check_acpi_compliance(info->full_pathname, info->node,
134 : : info->predefined);
135 : :
136 : : /*
137 : : * For all names: Check that the incoming argument count for
138 : : * this method/object matches the actual ASL/AML definition.
139 : : */
140 : 12873 : acpi_ns_check_argument_count(info->full_pathname, info->node,
141 : 12873 : info->param_count, info->predefined);
142 : :
143 : : /* For predefined names: Typecheck all incoming arguments */
144 : :
145 : 12873 : acpi_ns_check_argument_types(info);
146 : :
147 : : /*
148 : : * Three major evaluation cases:
149 : : *
150 : : * 1) Object types that cannot be evaluated by definition
151 : : * 2) The object is a control method -- execute it
152 : : * 3) The object is not a method -- just return it's current value
153 : : */
154 [ - + + ]: 12873 : switch (acpi_ns_get_type(info->node)) {
155 : 0 : case ACPI_TYPE_ANY:
156 : : case ACPI_TYPE_DEVICE:
157 : : case ACPI_TYPE_EVENT:
158 : : case ACPI_TYPE_MUTEX:
159 : : case ACPI_TYPE_REGION:
160 : : case ACPI_TYPE_THERMAL:
161 : : case ACPI_TYPE_LOCAL_SCOPE:
162 : : /*
163 : : * 1) Disallow evaluation of these object types. For these,
164 : : * object evaluation is undefined.
165 : : */
166 : 0 : ACPI_ERROR((AE_INFO,
167 : : "%s: This object type [%s] "
168 : : "never contains data and cannot be evaluated",
169 : : info->full_pathname,
170 : : acpi_ut_get_type_name(info->node->type)));
171 : :
172 : 0 : status = AE_TYPE;
173 : 0 : goto cleanup;
174 : :
175 : 1512 : case ACPI_TYPE_METHOD:
176 : : /*
177 : : * 2) Object is a control method - execute it
178 : : */
179 : :
180 : : /* Verify that there is a method object associated with this node */
181 : :
182 [ - + ]: 1512 : if (!info->obj_desc) {
183 : 0 : ACPI_ERROR((AE_INFO,
184 : : "%s: Method has no attached sub-object",
185 : : info->full_pathname));
186 : 0 : status = AE_NULL_OBJECT;
187 : 0 : goto cleanup;
188 : : }
189 : :
190 : : ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
191 : : "**** Execute method [%s] at AML address %p length %X\n",
192 : : info->full_pathname,
193 : : info->obj_desc->method.aml_start + 1,
194 : 1512 : info->obj_desc->method.aml_length - 1));
195 : :
196 : : /*
197 : : * Any namespace deletion must acquire both the namespace and
198 : : * interpreter locks to ensure that no thread is using the portion of
199 : : * the namespace that is being deleted.
200 : : *
201 : : * Execute the method via the interpreter. The interpreter is locked
202 : : * here before calling into the AML parser
203 : : */
204 : 1512 : acpi_ex_enter_interpreter();
205 : 1512 : status = acpi_ps_execute_method(info);
206 : 1512 : acpi_ex_exit_interpreter();
207 : 1512 : break;
208 : :
209 : 11361 : default:
210 : : /*
211 : : * 3) All other non-method objects -- get the current object value
212 : : */
213 : :
214 : : /*
215 : : * Some objects require additional resolution steps (e.g., the Node
216 : : * may be a field that must be read, etc.) -- we can't just grab
217 : : * the object out of the node.
218 : : *
219 : : * Use resolve_node_to_value() to get the associated value.
220 : : *
221 : : * NOTE: we can get away with passing in NULL for a walk state because
222 : : * the Node is guaranteed to not be a reference to either a method
223 : : * local or a method argument (because this interface is never called
224 : : * from a running method.)
225 : : *
226 : : * Even though we do not directly invoke the interpreter for object
227 : : * resolution, we must lock it because we could access an op_region.
228 : : * The op_region access code assumes that the interpreter is locked.
229 : : */
230 : 11361 : acpi_ex_enter_interpreter();
231 : :
232 : : /* TBD: resolve_node_to_value has a strange interface, fix */
233 : :
234 : 11361 : info->return_object =
235 : 11361 : ACPI_CAST_PTR(union acpi_operand_object, info->node);
236 : :
237 : 11361 : status =
238 : 11361 : acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
239 : : (struct acpi_namespace_node,
240 : : &info->return_object), NULL);
241 : 11361 : acpi_ex_exit_interpreter();
242 : :
243 [ - + ]: 11361 : if (ACPI_FAILURE(status)) {
244 : 0 : info->return_object = NULL;
245 : 0 : goto cleanup;
246 : : }
247 : :
248 : : ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned object %p [%s]\n",
249 : : info->return_object,
250 : : acpi_ut_get_object_type_name(info->
251 : : return_object)));
252 : :
253 : : status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
254 : : break;
255 : : }
256 : :
257 : : /*
258 : : * For predefined names, check the return value against the ACPI
259 : : * specification. Some incorrect return value types are repaired.
260 : : */
261 : 12873 : (void)acpi_ns_check_return_value(info->node, info, info->param_count,
262 : : status, &info->return_object);
263 : :
264 : : /* Check if there is a return value that must be dealt with */
265 : :
266 [ + - ]: 12873 : if (status == AE_CTRL_RETURN_VALUE) {
267 : :
268 : : /* If caller does not want the return value, delete it */
269 : :
270 [ + + ]: 12873 : if (info->flags & ACPI_IGNORE_RETURN_VALUE) {
271 : 42 : acpi_ut_remove_reference(info->return_object);
272 : 42 : info->return_object = NULL;
273 : : }
274 : :
275 : : /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
276 : :
277 : : status = AE_OK;
278 [ # # ]: 0 : } else if (ACPI_FAILURE(status)) {
279 : :
280 : : /* If return_object exists, delete it */
281 : :
282 [ # # ]: 0 : if (info->return_object) {
283 : 0 : acpi_ut_remove_reference(info->return_object);
284 : 0 : info->return_object = NULL;
285 : : }
286 : : }
287 : :
288 : : ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
289 : : "*** Completed evaluation of object %s ***\n",
290 : 12873 : info->relative_pathname));
291 : :
292 : 0 : cleanup:
293 : : /* Optional object evaluation log */
294 : :
295 : : ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
296 : : "%-26s: %s\n", " Exit evaluation",
297 : 12873 : &info->full_pathname[1]));
298 : :
299 : : /*
300 : : * Namespace was unlocked by the handling acpi_ns* function, so we
301 : : * just free the pathname and return
302 : : */
303 : 12873 : ACPI_FREE(info->full_pathname);
304 : 12873 : info->full_pathname = NULL;
305 : 12873 : return_ACPI_STATUS(status);
306 : : }
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