cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/evgpeinit.c

/******************************************************************************
 *
 * Module Name: evgpeinit - System GPE initialization and update
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

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


#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpeinit")
#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/*
 * Note: History of _PRW support in ACPICA
 *
 * Originally (2000 - 2010), the GPE initialization code performed a walk of
 * the entire namespace to execute the _PRW methods and detect all GPEs
 * capable of waking the system.
 *
 * As of 10/2010, the _PRW method execution has been removed since it is
 * actually unnecessary. The host OS must in fact execute all _PRW methods
 * in order to identify the device/power-resource dependencies. We now put
 * the onus on the host OS to identify the wake GPEs as part of this process
 * and to inform ACPICA of these GPEs via the acpi_setup_gpe_for_wake interface. This
 * not only reduces the complexity of the ACPICA initialization code, but in
 * some cases (on systems with very large namespaces) it should reduce the
 * kernel boot time as well.
 */

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_initialize
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
 *
 ******************************************************************************/

acpi_status acpi_ev_gpe_initialize(void) { u32 register_count0 = 0; u32 register_count1 = 0; u32 gpe_number_max = 0; acpi_status status; ACPI_FUNCTION_TRACE(ev_gpe_initialize); ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "Initializing General Purpose Events (GPEs):\n")); status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* * Initialize the GPE Block(s) defined in the FADT * * Why the GPE register block lengths are divided by 2: From the ACPI * Spec, section "General-Purpose Event Registers", we have: * * "Each register block contains two registers of equal length * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN * The length of the GPE1_STS and GPE1_EN registers is equal to * half the GPE1_LEN. If a generic register block is not supported * then its respective block pointer and block length values in the * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need * to be the same size." */ /* * Determine the maximum GPE number for this machine. * * Note: both GPE0 and GPE1 are optional, and either can exist without * the other. * * If EITHER the register length OR the block address are zero, then that * particular block is not supported. */ if (acpi_gbl_FADT.gpe0_block_length && acpi_gbl_FADT.xgpe0_block.address) { /* GPE block 0 exists (has both length and address > 0) */ register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2); gpe_number_max = (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1; /* Install GPE Block 0 */ status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, acpi_gbl_FADT.xgpe0_block. address, acpi_gbl_FADT.xgpe0_block. space_id, register_count0, 0, acpi_gbl_FADT.sci_interrupt, &acpi_gbl_gpe_fadt_blocks[0]); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Could not create GPE Block 0")); } } if (acpi_gbl_FADT.gpe1_block_length && acpi_gbl_FADT.xgpe1_block.address) { /* GPE block 1 exists (has both length and address > 0) */ register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2); /* Check for GPE0/GPE1 overlap (if both banks exist) */ if ((register_count0) && (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) { ACPI_ERROR((AE_INFO, "GPE0 block (GPE 0 to %u) overlaps the GPE1 block " "(GPE %u to %u) - Ignoring GPE1", gpe_number_max, acpi_gbl_FADT.gpe1_base, acpi_gbl_FADT.gpe1_base + ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1))); /* Ignore GPE1 block by setting the register count to zero */ register_count1 = 0; } else { /* Install GPE Block 1 */ status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, acpi_gbl_FADT.xgpe1_block. address, acpi_gbl_FADT.xgpe1_block. space_id, register_count1, acpi_gbl_FADT.gpe1_base, acpi_gbl_FADT. sci_interrupt, &acpi_gbl_gpe_fadt_blocks [1]); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Could not create GPE Block 1")); } /* * GPE0 and GPE1 do not have to be contiguous in the GPE number * space. However, GPE0 always starts at GPE number zero. */ gpe_number_max = acpi_gbl_FADT.gpe1_base + ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1); } } /* Exit if there are no GPE registers */ if ((register_count0 + register_count1) == 0) { /* GPEs are not required by ACPI, this is OK */ ACPI_DEBUG_PRINT((ACPI_DB_INIT, "There are no GPE blocks defined in the FADT\n")); status = AE_OK; goto cleanup; } cleanup: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore355100.00%3100.00%
Total355100.00%3100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_update_gpes * * PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table * * RETURN: None * * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a * result of a Load() or load_table() operation. If new GPE * methods have been installed, register the new methods. * ******************************************************************************/
void acpi_ev_update_gpes(acpi_owner_id table_owner_id) { struct acpi_gpe_xrupt_info *gpe_xrupt_info; struct acpi_gpe_block_info *gpe_block; struct acpi_gpe_walk_info walk_info; acpi_status status = AE_OK; /* * Find any _Lxx/_Exx GPE methods that have just been loaded. * * Any GPEs that correspond to new _Lxx/_Exx methods are immediately * enabled. * * Examine the namespace underneath each gpe_device within the * gpe_block lists. */ status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); if (ACPI_FAILURE(status)) { return; } walk_info.count = 0; walk_info.owner_id = table_owner_id; walk_info.execute_by_owner_id = TRUE; /* Walk the interrupt level descriptor list */ gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head; while (gpe_xrupt_info) { /* Walk all Gpe Blocks attached to this interrupt level */ gpe_block = gpe_xrupt_info->gpe_block_list_head; while (gpe_block) { walk_info.gpe_block = gpe_block; walk_info.gpe_device = gpe_block->node; status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, walk_info.gpe_device, ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK, acpi_ev_match_gpe_method, NULL, &walk_info, NULL); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "While decoding _Lxx/_Exx methods")); } gpe_block = gpe_block->next; } gpe_xrupt_info = gpe_xrupt_info->next; } if (walk_info.count) { ACPI_INFO(("Enabled %u new GPEs", walk_info.count)); } (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return; }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore17192.43%133.33%
Lin Ming73.78%133.33%
Rafael J. Wysocki73.78%133.33%
Total185100.00%3100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_match_gpe_method * * PARAMETERS: Callback from walk_namespace * * RETURN: Status * * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a * control method under the _GPE portion of the namespace. * Extract the name and GPE type from the object, saving this * information for quick lookup during GPE dispatch. Allows a * per-owner_id evaluation if execute_by_owner_id is TRUE in the * walk_info parameter block. * * The name of each GPE control method is of the form: * "_Lxx" or "_Exx", where: * L - means that the GPE is level triggered * E - means that the GPE is edge triggered * xx - is the GPE number [in HEX] * * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods * with that owner. * ******************************************************************************/
acpi_status acpi_ev_match_gpe_method(acpi_handle obj_handle, u32 level, void *context, void **return_value) { struct acpi_namespace_node *method_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); struct acpi_gpe_walk_info *walk_info = ACPI_CAST_PTR(struct acpi_gpe_walk_info, context); struct acpi_gpe_event_info *gpe_event_info; acpi_status status; u32 gpe_number; u8 temp_gpe_number; char name[ACPI_NAME_SIZE + 1]; u8 type; ACPI_FUNCTION_TRACE(ev_match_gpe_method); /* Check if requested owner_id matches this owner_id */ if ((walk_info->execute_by_owner_id) && (method_node->owner_id != walk_info->owner_id)) { return_ACPI_STATUS(AE_OK); } /* * Match and decode the _Lxx and _Exx GPE method names * * 1) Extract the method name and null terminate it */ ACPI_MOVE_32_TO_32(name, &method_node->name.integer); name[ACPI_NAME_SIZE] = 0; /* 2) Name must begin with an underscore */ if (name[0] != '_') { return_ACPI_STATUS(AE_OK); /* Ignore this method */ } /* * 3) Edge/Level determination is based on the 2nd character * of the method name */ switch (name[1]) { case 'L': type = ACPI_GPE_LEVEL_TRIGGERED; break; case 'E': type = ACPI_GPE_EDGE_TRIGGERED; break; default: /* Unknown method type, just ignore it */ ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Ignoring unknown GPE method type: %s " "(name not of form _Lxx or _Exx)", name)); return_ACPI_STATUS(AE_OK); } /* 4) The last two characters of the name are the hex GPE Number */ status = acpi_ut_ascii_to_hex_byte(&name[2], &temp_gpe_number); if (ACPI_FAILURE(status)) { /* Conversion failed; invalid method, just ignore it */ ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Could not extract GPE number from name: %s " "(name is not of form _Lxx or _Exx)", name)); return_ACPI_STATUS(AE_OK); } /* Ensure that we have a valid GPE number for this GPE block */ gpe_number = (u32)temp_gpe_number; gpe_event_info = acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block); if (!gpe_event_info) { /* * This gpe_number is not valid for this GPE block, just ignore it. * However, it may be valid for a different GPE block, since GPE0 * and GPE1 methods both appear under \_GPE. */ return_ACPI_STATUS(AE_OK); } if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == ACPI_GPE_DISPATCH_HANDLER) || (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == ACPI_GPE_DISPATCH_RAW_HANDLER)) { /* If there is already a handler, ignore this GPE method */ return_ACPI_STATUS(AE_OK); } if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == ACPI_GPE_DISPATCH_METHOD) { /* * If there is already a method, ignore this method. But check * for a type mismatch (if both the _Lxx AND _Exx exist) */ if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) { ACPI_ERROR((AE_INFO, "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods", gpe_number, gpe_number, gpe_number)); } return_ACPI_STATUS(AE_OK); } /* Disable the GPE in case it's been enabled already. */ (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); /* * Add the GPE information from above to the gpe_event_info block for * use during dispatch of this GPE. */ gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK); gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD); gpe_event_info->dispatch.method_node = method_node; ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Registered GPE method %s as GPE number 0x%.2X\n", name, gpe_number)); return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore35989.97%228.57%
Lv Zheng194.76%228.57%
Rafael J. Wysocki123.01%228.57%
Lin Ming92.26%114.29%
Total399100.00%7100.00%

#endif /* !ACPI_REDUCED_HARDWARE */

Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore91894.15%646.15%
Rafael J. Wysocki202.05%323.08%
Lv Zheng191.95%215.38%
Lin Ming181.85%215.38%
Total975100.00%13100.00%
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