1 /******************************************************************************
2 *
3 * Module Name: evgpeutil - GPE utilities
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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
45 #include "acpi.h"
46 #include "accommon.h"
47 #include "acevents.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME ("evgpeutil")
51
52
53 /*******************************************************************************
54 *
55 * FUNCTION: AcpiEvWalkGpeList
56 *
57 * PARAMETERS: GpeWalkCallback - Routine called for each GPE block
58 * Context - Value passed to callback
59 *
60 * RETURN: Status
61 *
62 * DESCRIPTION: Walk the GPE lists.
63 *
64 ******************************************************************************/
65
66 ACPI_STATUS
67 AcpiEvWalkGpeList (
68 ACPI_GPE_CALLBACK GpeWalkCallback,
69 void *Context)
70 {
71 ACPI_GPE_BLOCK_INFO *GpeBlock;
72 ACPI_GPE_XRUPT_INFO *GpeXruptInfo;
73 ACPI_STATUS Status = AE_OK;
74 ACPI_CPU_FLAGS Flags;
75
76
77 ACPI_FUNCTION_TRACE (EvWalkGpeList);
78
79
80 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
81
82 /* Walk the interrupt level descriptor list */
83
84 GpeXruptInfo = AcpiGbl_GpeXruptListHead;
85 while (GpeXruptInfo)
86 {
87 /* Walk all Gpe Blocks attached to this interrupt level */
88
89 GpeBlock = GpeXruptInfo->GpeBlockListHead;
90 while (GpeBlock)
91 {
92 /* One callback per GPE block */
93
94 Status = GpeWalkCallback (GpeXruptInfo, GpeBlock, Context);
95 if (ACPI_FAILURE (Status))
96 {
97 if (Status == AE_CTRL_END) /* Callback abort */
98 {
99 Status = AE_OK;
100 }
101 goto UnlockAndExit;
102 }
103
104 GpeBlock = GpeBlock->Next;
105 }
106
107 GpeXruptInfo = GpeXruptInfo->Next;
108 }
109
110 UnlockAndExit:
111 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
112 return_ACPI_STATUS (Status);
113 }
114
115
116 /*******************************************************************************
117 *
118 * FUNCTION: AcpiEvValidGpeEvent
119 *
120 * PARAMETERS: GpeEventInfo - Info for this GPE
121 *
122 * RETURN: TRUE if the GpeEvent is valid
123 *
124 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
125 * Should be called only when the GPE lists are semaphore locked
126 * and not subject to change.
127 *
128 ******************************************************************************/
129
130 BOOLEAN
131 AcpiEvValidGpeEvent (
132 ACPI_GPE_EVENT_INFO *GpeEventInfo)
133 {
134 ACPI_GPE_XRUPT_INFO *GpeXruptBlock;
135 ACPI_GPE_BLOCK_INFO *GpeBlock;
136
137
138 ACPI_FUNCTION_ENTRY ();
139
140
141 /* No need for spin lock since we are not changing any list elements */
142
143 /* Walk the GPE interrupt levels */
144
145 GpeXruptBlock = AcpiGbl_GpeXruptListHead;
146 while (GpeXruptBlock)
147 {
148 GpeBlock = GpeXruptBlock->GpeBlockListHead;
149
150 /* Walk the GPE blocks on this interrupt level */
151
152 while (GpeBlock)
153 {
154 if ((&GpeBlock->EventInfo[0] <= GpeEventInfo) &&
155 (&GpeBlock->EventInfo[GpeBlock->GpeCount] > GpeEventInfo))
156 {
157 return (TRUE);
158 }
159
160 GpeBlock = GpeBlock->Next;
161 }
162
163 GpeXruptBlock = GpeXruptBlock->Next;
164 }
165
166 return (FALSE);
167 }
168
169
170 /*******************************************************************************
171 *
172 * FUNCTION: AcpiEvGetGpeDevice
173 *
174 * PARAMETERS: GPE_WALK_CALLBACK
175 *
176 * RETURN: Status
177 *
178 * DESCRIPTION: Matches the input GPE index (0-CurrentGpeCount) with a GPE
179 * block device. NULL if the GPE is one of the FADT-defined GPEs.
180 *
181 ******************************************************************************/
182
183 ACPI_STATUS
184 AcpiEvGetGpeDevice (
185 ACPI_GPE_XRUPT_INFO *GpeXruptInfo,
186 ACPI_GPE_BLOCK_INFO *GpeBlock,
187 void *Context)
188 {
189 ACPI_GPE_DEVICE_INFO *Info = Context;
190
191
192 /* Increment Index by the number of GPEs in this block */
193
194 Info->NextBlockBaseIndex += GpeBlock->GpeCount;
195
196 if (Info->Index < Info->NextBlockBaseIndex)
197 {
198 /*
199 * The GPE index is within this block, get the node. Leave the node
200 * NULL for the FADT-defined GPEs
201 */
202 if ((GpeBlock->Node)->Type == ACPI_TYPE_DEVICE)
203 {
204 Info->GpeDevice = GpeBlock->Node;
205 }
206
207 Info->Status = AE_OK;
208 return (AE_CTRL_END);
209 }
210
211 return (AE_OK);
212 }
213
214
215 /*******************************************************************************
216 *
217 * FUNCTION: AcpiEvGetGpeXruptBlock
218 *
219 * PARAMETERS: InterruptNumber - Interrupt for a GPE block
220 *
221 * RETURN: A GPE interrupt block
222 *
223 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
224 * block per unique interrupt level used for GPEs. Should be
225 * called only when the GPE lists are semaphore locked and not
226 * subject to change.
227 *
228 ******************************************************************************/
229
230 ACPI_GPE_XRUPT_INFO *
231 AcpiEvGetGpeXruptBlock (
232 UINT32 InterruptNumber)
233 {
234 ACPI_GPE_XRUPT_INFO *NextGpeXrupt;
235 ACPI_GPE_XRUPT_INFO *GpeXrupt;
236 ACPI_STATUS Status;
237 ACPI_CPU_FLAGS Flags;
238
239
240 ACPI_FUNCTION_TRACE (EvGetGpeXruptBlock);
241
242
243 /* No need for lock since we are not changing any list elements here */
244
245 NextGpeXrupt = AcpiGbl_GpeXruptListHead;
246 while (NextGpeXrupt)
247 {
248 if (NextGpeXrupt->InterruptNumber == InterruptNumber)
249 {
250 return_PTR (NextGpeXrupt);
251 }
252
253 NextGpeXrupt = NextGpeXrupt->Next;
254 }
255
256 /* Not found, must allocate a new xrupt descriptor */
257
258 GpeXrupt = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_XRUPT_INFO));
259 if (!GpeXrupt)
260 {
261 return_PTR (NULL);
262 }
263
264 GpeXrupt->InterruptNumber = InterruptNumber;
265
266 /* Install new interrupt descriptor with spin lock */
267
268 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
269 if (AcpiGbl_GpeXruptListHead)
270 {
271 NextGpeXrupt = AcpiGbl_GpeXruptListHead;
272 while (NextGpeXrupt->Next)
273 {
274 NextGpeXrupt = NextGpeXrupt->Next;
275 }
276
277 NextGpeXrupt->Next = GpeXrupt;
278 GpeXrupt->Previous = NextGpeXrupt;
279 }
280 else
281 {
282 AcpiGbl_GpeXruptListHead = GpeXrupt;
283 }
284 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
285
286 /* Install new interrupt handler if not SCI_INT */
287
288 if (InterruptNumber != AcpiGbl_FADT.SciInterrupt)
289 {
290 Status = AcpiOsInstallInterruptHandler (InterruptNumber,
291 AcpiEvGpeXruptHandler, GpeXrupt);
292 if (ACPI_FAILURE (Status))
293 {
294 ACPI_ERROR ((AE_INFO,
295 "Could not install GPE interrupt handler at level 0x%X",
296 InterruptNumber));
297 return_PTR (NULL);
298 }
299 }
300
301 return_PTR (GpeXrupt);
302 }
303
304
305 /*******************************************************************************
306 *
307 * FUNCTION: AcpiEvDeleteGpeXrupt
308 *
309 * PARAMETERS: GpeXrupt - A GPE interrupt info block
310 *
311 * RETURN: Status
312 *
313 * DESCRIPTION: Remove and free a GpeXrupt block. Remove an associated
314 * interrupt handler if not the SCI interrupt.
315 *
316 ******************************************************************************/
317
318 ACPI_STATUS
319 AcpiEvDeleteGpeXrupt (
320 ACPI_GPE_XRUPT_INFO *GpeXrupt)
321 {
322 ACPI_STATUS Status;
323 ACPI_CPU_FLAGS Flags;
324
325
326 ACPI_FUNCTION_TRACE (EvDeleteGpeXrupt);
327
328
329 /* We never want to remove the SCI interrupt handler */
330
331 if (GpeXrupt->InterruptNumber == AcpiGbl_FADT.SciInterrupt)
332 {
333 GpeXrupt->GpeBlockListHead = NULL;
334 return_ACPI_STATUS (AE_OK);
335 }
336
337 /* Disable this interrupt */
338
339 Status = AcpiOsRemoveInterruptHandler (
340 GpeXrupt->InterruptNumber, AcpiEvGpeXruptHandler);
341 if (ACPI_FAILURE (Status))
342 {
343 return_ACPI_STATUS (Status);
344 }
345
346 /* Unlink the interrupt block with lock */
347
348 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
349 if (GpeXrupt->Previous)
350 {
351 GpeXrupt->Previous->Next = GpeXrupt->Next;
352 }
353 else
354 {
355 /* No previous, update list head */
356
357 AcpiGbl_GpeXruptListHead = GpeXrupt->Next;
358 }
359
360 if (GpeXrupt->Next)
361 {
362 GpeXrupt->Next->Previous = GpeXrupt->Previous;
363 }
364 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
365
366 /* Free the block */
367
368 ACPI_FREE (GpeXrupt);
369 return_ACPI_STATUS (AE_OK);
370 }
371
372
373 /*******************************************************************************
374 *
375 * FUNCTION: AcpiEvDeleteGpeHandlers
376 *
377 * PARAMETERS: GpeXruptInfo - GPE Interrupt info
378 * GpeBlock - Gpe Block info
379 *
380 * RETURN: Status
381 *
382 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
383 * Used only prior to termination.
384 *
385 ******************************************************************************/
386
387 ACPI_STATUS
388 AcpiEvDeleteGpeHandlers (
389 ACPI_GPE_XRUPT_INFO *GpeXruptInfo,
390 ACPI_GPE_BLOCK_INFO *GpeBlock,
391 void *Context)
392 {
393 ACPI_GPE_EVENT_INFO *GpeEventInfo;
394 UINT32 i;
395 UINT32 j;
396
397
398 ACPI_FUNCTION_TRACE (EvDeleteGpeHandlers);
399
400
401 /* Examine each GPE Register within the block */
402
403 for (i = 0; i < GpeBlock->RegisterCount; i++)
404 {
405 /* Now look at the individual GPEs in this byte register */
406
407 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
408 {
409 GpeEventInfo = &GpeBlock->EventInfo[((ACPI_SIZE) i *
410 ACPI_GPE_REGISTER_WIDTH) + j];
411
412 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
413 ACPI_GPE_DISPATCH_HANDLER)
414 {
415 ACPI_FREE (GpeEventInfo->Dispatch.Handler);
416 GpeEventInfo->Dispatch.Handler = NULL;
417 GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK;
418 }
419 }
420 }
421
422 return_ACPI_STATUS (AE_OK);
423 }
424