These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / acpi / acpica / utxfinit.c
1 /******************************************************************************
2  *
3  * Module Name: utxfinit - External interfaces for ACPICA initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2015, 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 #define EXPORT_ACPI_INTERFACES
45
46 #include <acpi/acpi.h>
47 #include "accommon.h"
48 #include "acevents.h"
49 #include "acnamesp.h"
50 #include "acdebug.h"
51 #include "actables.h"
52
53 #define _COMPONENT          ACPI_UTILITIES
54 ACPI_MODULE_NAME("utxfinit")
55
56 /* For acpi_exec only */
57 void ae_do_object_overrides(void);
58
59 /*******************************************************************************
60  *
61  * FUNCTION:    acpi_initialize_subsystem
62  *
63  * PARAMETERS:  None
64  *
65  * RETURN:      Status
66  *
67  * DESCRIPTION: Initializes all global variables. This is the first function
68  *              called, so any early initialization belongs here.
69  *
70  ******************************************************************************/
71
72 acpi_status __init acpi_initialize_subsystem(void)
73 {
74         acpi_status status;
75
76         ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);
77
78         acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;
79         ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
80
81         /* Initialize the OS-Dependent layer */
82
83         status = acpi_os_initialize();
84         if (ACPI_FAILURE(status)) {
85                 ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));
86                 return_ACPI_STATUS(status);
87         }
88
89         /* Initialize all globals used by the subsystem */
90
91         status = acpi_ut_init_globals();
92         if (ACPI_FAILURE(status)) {
93                 ACPI_EXCEPTION((AE_INFO, status,
94                                 "During initialization of globals"));
95                 return_ACPI_STATUS(status);
96         }
97
98         /* Create the default mutex objects */
99
100         status = acpi_ut_mutex_initialize();
101         if (ACPI_FAILURE(status)) {
102                 ACPI_EXCEPTION((AE_INFO, status,
103                                 "During Global Mutex creation"));
104                 return_ACPI_STATUS(status);
105         }
106
107         /*
108          * Initialize the namespace manager and
109          * the root of the namespace tree
110          */
111         status = acpi_ns_root_initialize();
112         if (ACPI_FAILURE(status)) {
113                 ACPI_EXCEPTION((AE_INFO, status,
114                                 "During Namespace initialization"));
115                 return_ACPI_STATUS(status);
116         }
117
118         /* Initialize the global OSI interfaces list with the static names */
119
120         status = acpi_ut_initialize_interfaces();
121         if (ACPI_FAILURE(status)) {
122                 ACPI_EXCEPTION((AE_INFO, status,
123                                 "During OSI interfaces initialization"));
124                 return_ACPI_STATUS(status);
125         }
126
127         return_ACPI_STATUS(AE_OK);
128 }
129
130 ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_subsystem)
131
132 /*******************************************************************************
133  *
134  * FUNCTION:    acpi_enable_subsystem
135  *
136  * PARAMETERS:  flags               - Init/enable Options
137  *
138  * RETURN:      Status
139  *
140  * DESCRIPTION: Completes the subsystem initialization including hardware.
141  *              Puts system into ACPI mode if it isn't already.
142  *
143  ******************************************************************************/
144 acpi_status __init acpi_enable_subsystem(u32 flags)
145 {
146         acpi_status status = AE_OK;
147
148         ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
149
150 #if (!ACPI_REDUCED_HARDWARE)
151
152         /* Enable ACPI mode */
153
154         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
155                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
156                                   "[Init] Going into ACPI mode\n"));
157
158                 acpi_gbl_original_mode = acpi_hw_get_mode();
159
160                 status = acpi_enable();
161                 if (ACPI_FAILURE(status)) {
162                         ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
163                         return_ACPI_STATUS(status);
164                 }
165         }
166
167         /*
168          * Obtain a permanent mapping for the FACS. This is required for the
169          * Global Lock and the Firmware Waking Vector
170          */
171         if (!(flags & ACPI_NO_FACS_INIT)) {
172                 status = acpi_tb_initialize_facs();
173                 if (ACPI_FAILURE(status)) {
174                         ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
175                         return_ACPI_STATUS(status);
176                 }
177         }
178 #endif                          /* !ACPI_REDUCED_HARDWARE */
179
180         /*
181          * Install the default op_region handlers. These are installed unless
182          * other handlers have already been installed via the
183          * install_address_space_handler interface.
184          */
185         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
186                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
187                                   "[Init] Installing default address space handlers\n"));
188
189                 status = acpi_ev_install_region_handlers();
190                 if (ACPI_FAILURE(status)) {
191                         return_ACPI_STATUS(status);
192                 }
193         }
194 #if (!ACPI_REDUCED_HARDWARE)
195         /*
196          * Initialize ACPI Event handling (Fixed and General Purpose)
197          *
198          * Note1: We must have the hardware and events initialized before we can
199          * execute any control methods safely. Any control method can require
200          * ACPI hardware support, so the hardware must be fully initialized before
201          * any method execution!
202          *
203          * Note2: Fixed events are initialized and enabled here. GPEs are
204          * initialized, but cannot be enabled until after the hardware is
205          * completely initialized (SCI and global_lock activated) and the various
206          * initialization control methods are run (_REG, _STA, _INI) on the
207          * entire namespace.
208          */
209         if (!(flags & ACPI_NO_EVENT_INIT)) {
210                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
211                                   "[Init] Initializing ACPI events\n"));
212
213                 status = acpi_ev_initialize_events();
214                 if (ACPI_FAILURE(status)) {
215                         return_ACPI_STATUS(status);
216                 }
217         }
218
219         /*
220          * Install the SCI handler and Global Lock handler. This completes the
221          * hardware initialization.
222          */
223         if (!(flags & ACPI_NO_HANDLER_INIT)) {
224                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
225                                   "[Init] Installing SCI/GL handlers\n"));
226
227                 status = acpi_ev_install_xrupt_handlers();
228                 if (ACPI_FAILURE(status)) {
229                         return_ACPI_STATUS(status);
230                 }
231         }
232 #endif                          /* !ACPI_REDUCED_HARDWARE */
233
234         return_ACPI_STATUS(status);
235 }
236
237 ACPI_EXPORT_SYMBOL_INIT(acpi_enable_subsystem)
238
239 /*******************************************************************************
240  *
241  * FUNCTION:    acpi_initialize_objects
242  *
243  * PARAMETERS:  flags               - Init/enable Options
244  *
245  * RETURN:      Status
246  *
247  * DESCRIPTION: Completes namespace initialization by initializing device
248  *              objects and executing AML code for Regions, buffers, etc.
249  *
250  ******************************************************************************/
251 acpi_status __init acpi_initialize_objects(u32 flags)
252 {
253         acpi_status status = AE_OK;
254
255         ACPI_FUNCTION_TRACE(acpi_initialize_objects);
256
257         /*
258          * Run all _REG methods
259          *
260          * Note: Any objects accessed by the _REG methods will be automatically
261          * initialized, even if they contain executable AML (see the call to
262          * acpi_ns_initialize_objects below).
263          */
264         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
265                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
266                                   "[Init] Executing _REG OpRegion methods\n"));
267
268                 status = acpi_ev_initialize_op_regions();
269                 if (ACPI_FAILURE(status)) {
270                         return_ACPI_STATUS(status);
271                 }
272         }
273 #ifdef ACPI_EXEC_APP
274         /*
275          * This call implements the "initialization file" option for acpi_exec.
276          * This is the precise point that we want to perform the overrides.
277          */
278         ae_do_object_overrides();
279 #endif
280
281         /*
282          * Execute any module-level code that was detected during the table load
283          * phase. Although illegal since ACPI 2.0, there are many machines that
284          * contain this type of code. Each block of detected executable AML code
285          * outside of any control method is wrapped with a temporary control
286          * method object and placed on a global list. The methods on this list
287          * are executed below.
288          */
289         acpi_ns_exec_module_code_list();
290
291         /*
292          * Initialize the objects that remain uninitialized. This runs the
293          * executable AML that may be part of the declaration of these objects:
294          * operation_regions, buffer_fields, Buffers, and Packages.
295          */
296         if (!(flags & ACPI_NO_OBJECT_INIT)) {
297                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
298                                   "[Init] Completing Initialization of ACPI Objects\n"));
299
300                 status = acpi_ns_initialize_objects();
301                 if (ACPI_FAILURE(status)) {
302                         return_ACPI_STATUS(status);
303                 }
304         }
305
306         /*
307          * Initialize all device objects in the namespace. This runs the device
308          * _STA and _INI methods.
309          */
310         if (!(flags & ACPI_NO_DEVICE_INIT)) {
311                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
312                                   "[Init] Initializing ACPI Devices\n"));
313
314                 status = acpi_ns_initialize_devices();
315                 if (ACPI_FAILURE(status)) {
316                         return_ACPI_STATUS(status);
317                 }
318         }
319
320         /*
321          * Empty the caches (delete the cached objects) on the assumption that
322          * the table load filled them up more than they will be at runtime --
323          * thus wasting non-paged memory.
324          */
325         status = acpi_purge_cached_objects();
326
327         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
328         return_ACPI_STATUS(status);
329 }
330
331 ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_objects)