1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3  *
4  * Module Name: evmisc - Miscellaneous event manager support functions
5  *
6  * Copyright (C) 2000 - 2022, Intel Corp.
7  *
8  *****************************************************************************/
9 
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acevents.h"
13 #include "acnamesp.h"
14 
15 #define _COMPONENT          ACPI_EVENTS
16 ACPI_MODULE_NAME("evmisc")
17 
18 /* Local prototypes */
19 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
20 
21 /*******************************************************************************
22  *
23  * FUNCTION:    acpi_ev_is_notify_object
24  *
25  * PARAMETERS:  node            - Node to check
26  *
27  * RETURN:      TRUE if notifies allowed on this object
28  *
29  * DESCRIPTION: Check type of node for a object that supports notifies.
30  *
31  *              TBD: This could be replaced by a flag bit in the node.
32  *
33  ******************************************************************************/
34 
acpi_ev_is_notify_object(struct acpi_namespace_node * node)35 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
36 {
37 
38 	switch (node->type) {
39 	case ACPI_TYPE_DEVICE:
40 	case ACPI_TYPE_PROCESSOR:
41 	case ACPI_TYPE_THERMAL:
42 		/*
43 		 * These are the ONLY objects that can receive ACPI notifications
44 		 */
45 		return (TRUE);
46 
47 	default:
48 
49 		return (FALSE);
50 	}
51 }
52 
53 /*******************************************************************************
54  *
55  * FUNCTION:    acpi_ev_queue_notify_request
56  *
57  * PARAMETERS:  node            - NS node for the notified object
58  *              notify_value    - Value from the Notify() request
59  *
60  * RETURN:      Status
61  *
62  * DESCRIPTION: Dispatch a device notification event to a previously
63  *              installed handler.
64  *
65  ******************************************************************************/
66 
67 acpi_status
acpi_ev_queue_notify_request(struct acpi_namespace_node * node,u32 notify_value)68 acpi_ev_queue_notify_request(struct acpi_namespace_node *node, u32 notify_value)
69 {
70 	union acpi_operand_object *obj_desc;
71 	union acpi_operand_object *handler_list_head = NULL;
72 	union acpi_generic_state *info;
73 	u8 handler_list_id = 0;
74 	acpi_status status = AE_OK;
75 
76 	ACPI_FUNCTION_NAME(ev_queue_notify_request);
77 
78 	/* Are Notifies allowed on this object? */
79 
80 	if (!acpi_ev_is_notify_object(node)) {
81 		return (AE_TYPE);
82 	}
83 
84 	/* Get the correct notify list type (System or Device) */
85 
86 	if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
87 		handler_list_id = ACPI_SYSTEM_HANDLER_LIST;
88 	} else {
89 		handler_list_id = ACPI_DEVICE_HANDLER_LIST;
90 	}
91 
92 	/* Get the notify object attached to the namespace Node */
93 
94 	obj_desc = acpi_ns_get_attached_object(node);
95 	if (obj_desc) {
96 
97 		/* We have an attached object, Get the correct handler list */
98 
99 		handler_list_head =
100 		    obj_desc->common_notify.notify_list[handler_list_id];
101 	}
102 
103 	/*
104 	 * If there is no notify handler (Global or Local)
105 	 * for this object, just ignore the notify
106 	 */
107 	if (!acpi_gbl_global_notify[handler_list_id].handler
108 	    && !handler_list_head) {
109 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
110 				  "No notify handler for Notify, ignoring (%4.4s, %X) node %p\n",
111 				  acpi_ut_get_node_name(node), notify_value,
112 				  node));
113 
114 		return (AE_OK);
115 	}
116 
117 	/* Setup notify info and schedule the notify dispatcher */
118 
119 	info = acpi_ut_create_generic_state();
120 	if (!info) {
121 		return (AE_NO_MEMORY);
122 	}
123 
124 	info->common.descriptor_type = ACPI_DESC_TYPE_STATE_NOTIFY;
125 
126 	info->notify.node = node;
127 	info->notify.value = (u16)notify_value;
128 	info->notify.handler_list_id = handler_list_id;
129 	info->notify.handler_list_head = handler_list_head;
130 	info->notify.global = &acpi_gbl_global_notify[handler_list_id];
131 
132 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
133 			  "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
134 			  acpi_ut_get_node_name(node),
135 			  acpi_ut_get_type_name(node->type), notify_value,
136 			  acpi_ut_get_notify_name(notify_value, ACPI_TYPE_ANY),
137 			  node));
138 
139 	status = acpi_os_execute(OSL_NOTIFY_HANDLER,
140 				 acpi_ev_notify_dispatch, info);
141 	if (ACPI_FAILURE(status)) {
142 		acpi_ut_delete_generic_state(info);
143 	}
144 
145 	return (status);
146 }
147 
148 /*******************************************************************************
149  *
150  * FUNCTION:    acpi_ev_notify_dispatch
151  *
152  * PARAMETERS:  context         - To be passed to the notify handler
153  *
154  * RETURN:      None.
155  *
156  * DESCRIPTION: Dispatch a device notification event to a previously
157  *              installed handler.
158  *
159  ******************************************************************************/
160 
acpi_ev_notify_dispatch(void * context)161 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
162 {
163 	union acpi_generic_state *info = (union acpi_generic_state *)context;
164 	union acpi_operand_object *handler_obj;
165 
166 	ACPI_FUNCTION_ENTRY();
167 
168 	/* Invoke a global notify handler if installed */
169 
170 	if (info->notify.global->handler) {
171 		info->notify.global->handler(info->notify.node,
172 					     info->notify.value,
173 					     info->notify.global->context);
174 	}
175 
176 	/* Now invoke the local notify handler(s) if any are installed */
177 
178 	handler_obj = info->notify.handler_list_head;
179 	while (handler_obj) {
180 		handler_obj->notify.handler(info->notify.node,
181 					    info->notify.value,
182 					    handler_obj->notify.context);
183 
184 		handler_obj =
185 		    handler_obj->notify.next[info->notify.handler_list_id];
186 	}
187 
188 	/* All done with the info object */
189 
190 	acpi_ut_delete_generic_state(info);
191 }
192 
193 #if (!ACPI_REDUCED_HARDWARE)
194 /******************************************************************************
195  *
196  * FUNCTION:    acpi_ev_terminate
197  *
198  * PARAMETERS:  none
199  *
200  * RETURN:      none
201  *
202  * DESCRIPTION: Disable events and free memory allocated for table storage.
203  *
204  ******************************************************************************/
205 
acpi_ev_terminate(void)206 void acpi_ev_terminate(void)
207 {
208 	u32 i;
209 	acpi_status status;
210 
211 	ACPI_FUNCTION_TRACE(ev_terminate);
212 
213 	if (acpi_gbl_events_initialized) {
214 		/*
215 		 * Disable all event-related functionality. In all cases, on error,
216 		 * print a message but obviously we don't abort.
217 		 */
218 
219 		/* Disable all fixed events */
220 
221 		for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
222 			status = acpi_disable_event(i, 0);
223 			if (ACPI_FAILURE(status)) {
224 				ACPI_ERROR((AE_INFO,
225 					    "Could not disable fixed event %u",
226 					    (u32) i));
227 			}
228 		}
229 
230 		/* Disable all GPEs in all GPE blocks */
231 
232 		status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
233 		if (ACPI_FAILURE(status)) {
234 			ACPI_EXCEPTION((AE_INFO, status,
235 					"Could not disable GPEs in GPE block"));
236 		}
237 
238 		status = acpi_ev_remove_global_lock_handler();
239 		if (ACPI_FAILURE(status)) {
240 			ACPI_EXCEPTION((AE_INFO, status,
241 					"Could not remove Global Lock handler"));
242 		}
243 
244 		acpi_gbl_events_initialized = FALSE;
245 	}
246 
247 	/* Remove SCI handlers */
248 
249 	status = acpi_ev_remove_all_sci_handlers();
250 	if (ACPI_FAILURE(status)) {
251 		ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
252 	}
253 
254 	/* Deallocate all handler objects installed within GPE info structs */
255 
256 	status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
257 	if (ACPI_FAILURE(status)) {
258 		ACPI_EXCEPTION((AE_INFO, status,
259 				"Could not delete GPE handlers"));
260 	}
261 
262 	/* Return to original mode if necessary */
263 
264 	if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
265 		status = acpi_disable();
266 		if (ACPI_FAILURE(status)) {
267 			ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
268 		}
269 	}
270 	return_VOID;
271 }
272 
273 #endif				/* !ACPI_REDUCED_HARDWARE */
274