Linux debugging

Check our new training course

Linux debugging, tracing, profiling & perf. analysis

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: evgpeblk - GPE block creation and initialization.
 *
 * Copyright (C) 2000 - 2022, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpeblk")
#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/* Local prototypes */
static acpi_status
acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
			  u32 interrupt_number);

static acpi_status
acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_gpe_block
 *
 * PARAMETERS:  gpe_block               - New GPE block
 *              interrupt_number        - Xrupt to be associated with this
 *                                        GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install new GPE block with mutex support
 *
 ******************************************************************************/

static acpi_status
acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
			  u32 interrupt_number)
{
	struct acpi_gpe_block_info *next_gpe_block;
	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_install_gpe_block);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status =
	    acpi_ev_get_gpe_xrupt_block(interrupt_number, &gpe_xrupt_block);
	if (ACPI_FAILURE(status)) {
		goto unlock_and_exit;
	}

	/* Install the new block at the end of the list with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (gpe_xrupt_block->gpe_block_list_head) {
		next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
		while (next_gpe_block->next) {
			next_gpe_block = next_gpe_block->next;
		}

		next_gpe_block->next = gpe_block;
		gpe_block->previous = next_gpe_block;
	} else {
		gpe_xrupt_block->gpe_block_list_head = gpe_block;
	}

	gpe_block->xrupt_block = gpe_xrupt_block;
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_delete_gpe_block
 *
 * PARAMETERS:  gpe_block           - Existing GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a GPE block
 *
 ******************************************************************************/

acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
{
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_install_gpe_block);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Disable all GPEs in this block */

	status =
	    acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (!gpe_block->previous && !gpe_block->next) {

		/* This is the last gpe_block on this interrupt */

		status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
		if (ACPI_FAILURE(status)) {
			goto unlock_and_exit;
		}
	} else {
		/* Remove the block on this interrupt with lock */

		flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
		if (gpe_block->previous) {
			gpe_block->previous->next = gpe_block->next;
		} else {
			gpe_block->xrupt_block->gpe_block_list_head =
			    gpe_block->next;
		}

		if (gpe_block->next) {
			gpe_block->next->previous = gpe_block->previous;
		}

		acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	}

	acpi_current_gpe_count -= gpe_block->gpe_count;

	/* Free the gpe_block */

	ACPI_FREE(gpe_block->register_info);
	ACPI_FREE(gpe_block->event_info);
	ACPI_FREE(gpe_block);

unlock_and_exit:
	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_create_gpe_info_blocks
 *
 * PARAMETERS:  gpe_block   - New GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 *
 ******************************************************************************/

static acpi_status
acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
{
	struct acpi_gpe_register_info *gpe_register_info = NULL;
	struct acpi_gpe_event_info *gpe_event_info = NULL;
	struct acpi_gpe_event_info *this_event;
	struct acpi_gpe_register_info *this_register;
	u32 i;
	u32 j;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);

	/* Allocate the GPE register information block */

	gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size)gpe_block->
						 register_count *
						 sizeof(struct
							acpi_gpe_register_info));
	if (!gpe_register_info) {
		ACPI_ERROR((AE_INFO,
			    "Could not allocate the GpeRegisterInfo table"));
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/*
	 * Allocate the GPE event_info block. There are eight distinct GPEs
	 * per register. Initialization to zeros is sufficient.
	 */
	gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size)gpe_block->gpe_count *
					      sizeof(struct
						     acpi_gpe_event_info));
	if (!gpe_event_info) {
		ACPI_ERROR((AE_INFO,
			    "Could not allocate the GpeEventInfo table"));
		status = AE_NO_MEMORY;
		goto error_exit;
	}

	/* Save the new Info arrays in the GPE block */

	gpe_block->register_info = gpe_register_info;
	gpe_block->event_info = gpe_event_info;

	/*
	 * Initialize the GPE Register and Event structures. A goal of these
	 * tables is to hide the fact that there are two separate GPE register
	 * sets in a given GPE hardware block, the status registers occupy the
	 * first half, and the enable registers occupy the second half.
	 */
	this_register = gpe_register_info;
	this_event = gpe_event_info;

	for (i = 0; i < gpe_block->register_count; i++) {

		/* Init the register_info for this GPE register (8 GPEs) */

		this_register->base_gpe_number = (u16)
		    (gpe_block->block_base_number +
		     (i * ACPI_GPE_REGISTER_WIDTH));

		this_register->status_address.address = gpe_block->address + i;

		this_register->enable_address.address =
		    gpe_block->address + i + gpe_block->register_count;

		this_register->status_address.space_id = gpe_block->space_id;
		this_register->enable_address.space_id = gpe_block->space_id;

		/* Init the event_info for each GPE within this register */

		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
			this_event->gpe_number =
			    (u8) (this_register->base_gpe_number + j);
			this_event->register_info = this_register;
			this_event++;
		}

		/* Disable all GPEs within this register */

		status = acpi_hw_gpe_write(0x00, &this_register->enable_address);
		if (ACPI_FAILURE(status)) {
			goto error_exit;
		}

		/* Clear any pending GPE events within this register */

		status = acpi_hw_gpe_write(0xFF, &this_register->status_address);
		if (ACPI_FAILURE(status)) {
			goto error_exit;
		}

		this_register++;
	}

	return_ACPI_STATUS(AE_OK);

error_exit:
	if (gpe_register_info) {
		ACPI_FREE(gpe_register_info);
	}
	if (gpe_event_info) {
		ACPI_FREE(gpe_event_info);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_create_gpe_block
 *
 * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 *              gpe_block_address   - Address and space_ID
 *              register_count      - Number of GPE register pairs in the block
 *              gpe_block_base_number - Starting GPE number for the block
 *              interrupt_number    - H/W interrupt for the block
 *              return_gpe_block    - Where the new block descriptor is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 *              the block are disabled at exit.
 *              Note: Assumes namespace is locked.
 *
 ******************************************************************************/

acpi_status
acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
			 u64 address,
			 u8 space_id,
			 u32 register_count,
			 u16 gpe_block_base_number,
			 u32 interrupt_number,
			 struct acpi_gpe_block_info **return_gpe_block)
{
	acpi_status status;
	struct acpi_gpe_block_info *gpe_block;
	struct acpi_gpe_walk_info walk_info;

	ACPI_FUNCTION_TRACE(ev_create_gpe_block);

	if (!register_count) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Validate the space_ID */

	if ((space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
	    (space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
		ACPI_ERROR((AE_INFO,
			    "Unsupported address space: 0x%X", space_id));
		return_ACPI_STATUS(AE_SUPPORT);
	}

	if (space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
		status = acpi_hw_validate_io_block(address,
						   ACPI_GPE_REGISTER_WIDTH,
						   register_count);
		if (ACPI_FAILURE(status))
			return_ACPI_STATUS(status);
	}

	/* Allocate a new GPE block */

	gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
	if (!gpe_block) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Initialize the new GPE block */

	gpe_block->address = address;
	gpe_block->space_id = space_id;
	gpe_block->node = gpe_device;
	gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
	gpe_block->initialized = FALSE;
	gpe_block->register_count = register_count;
	gpe_block->block_base_number = gpe_block_base_number;

	/*
	 * Create the register_info and event_info sub-structures
	 * Note: disables and clears all GPEs in the block
	 */
	status = acpi_ev_create_gpe_info_blocks(gpe_block);
	if (ACPI_FAILURE(status)) {
		ACPI_FREE(gpe_block);
		return_ACPI_STATUS(status);
	}

	/* Install the new block in the global lists */

	status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
	if (ACPI_FAILURE(status)) {
		ACPI_FREE(gpe_block->register_info);
		ACPI_FREE(gpe_block->event_info);
		ACPI_FREE(gpe_block);
		return_ACPI_STATUS(status);
	}

	acpi_gbl_all_gpes_initialized = FALSE;

	/* Find all GPE methods (_Lxx or_Exx) for this block */

	walk_info.gpe_block = gpe_block;
	walk_info.gpe_device = gpe_device;
	walk_info.execute_by_owner_id = FALSE;

	(void)acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
				     ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
				     acpi_ev_match_gpe_method, NULL, &walk_info,
				     NULL);

	/* Return the new block */

	if (return_gpe_block) {
		(*return_gpe_block) = gpe_block;
	}

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
			      "    Initialized GPE %02X to %02X [%4.4s] %u regs on interrupt 0x%X%s\n",
			      (u32)gpe_block->block_base_number,
			      (u32)(gpe_block->block_base_number +
				    (gpe_block->gpe_count - 1)),
			      gpe_device->name.ascii, gpe_block->register_count,
			      interrupt_number,
			      interrupt_number ==
			      acpi_gbl_FADT.sci_interrupt ? " (SCI)" : ""));

	/* Update global count of currently available GPEs */

	acpi_current_gpe_count += gpe_block->gpe_count;
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_initialize_gpe_block
 *
 * PARAMETERS:  acpi_gpe_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize and enable a GPE block. Enable GPEs that have
 *              associated methods.
 *              Note: Assumes namespace is locked.
 *
 ******************************************************************************/

acpi_status
acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
			     struct acpi_gpe_block_info *gpe_block,
			     void *context)
{
	acpi_status status;
	struct acpi_gpe_event_info *gpe_event_info;
	u32 gpe_enabled_count;
	u32 gpe_index;
	u32 i;
	u32 j;
	u8 *is_polling_needed = context;
	ACPI_ERROR_ONLY(u32 gpe_number);

	ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);

	/*
	 * Ignore a null GPE block (e.g., if no GPE block 1 exists), and
	 * any GPE blocks that have been initialized already.
	 */
	if (!gpe_block || gpe_block->initialized) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Enable all GPEs that have a corresponding method and have the
	 * ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block
	 * must be enabled via the acpi_enable_gpe() interface.
	 */
	gpe_enabled_count = 0;

	for (i = 0; i < gpe_block->register_count; i++) {
		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

			/* Get the info block for this particular GPE */

			gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
			gpe_event_info = &gpe_block->event_info[gpe_index];
			ACPI_ERROR_ONLY(gpe_number =
					gpe_block->block_base_number +
					gpe_index);
			gpe_event_info->flags |= ACPI_GPE_INITIALIZED;

			/*
			 * Ignore GPEs that have no corresponding _Lxx/_Exx method
			 * and GPEs that are used for wakeup
			 */
			if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
			     ACPI_GPE_DISPATCH_METHOD)
			    || (gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
				continue;
			}

			status = acpi_ev_add_gpe_reference(gpe_event_info, FALSE);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
					"Could not enable GPE 0x%02X",
					gpe_number));
				continue;
			}

			gpe_event_info->flags |= ACPI_GPE_AUTO_ENABLED;

			if (is_polling_needed &&
			    ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) {
				*is_polling_needed = TRUE;
			}

			gpe_enabled_count++;
		}
	}

	if (gpe_enabled_count) {
		ACPI_INFO(("Enabled %u GPEs in block %02X to %02X",
			   gpe_enabled_count, (u32)gpe_block->block_base_number,
			   (u32)(gpe_block->block_base_number +
				 (gpe_block->gpe_count - 1))));
	}

	gpe_block->initialized = TRUE;

	return_ACPI_STATUS(AE_OK);
}

#endif				/* !ACPI_REDUCED_HARDWARE */