cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/evsci.c

/*******************************************************************************
 *
 * Module Name: evsci - System Control Interrupt configuration and
 *                      legacy to ACPI mode state transition functions
 *
 ******************************************************************************/

/*
 * 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"


#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evsci")
#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/* Local prototypes */
static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_sci_dispatch
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status code indicates whether interrupt was handled.
 *
 * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
 *
 ******************************************************************************/


u32 acpi_ev_sci_dispatch(void) { struct acpi_sci_handler_info *sci_handler; acpi_cpu_flags flags; u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; ACPI_FUNCTION_NAME(ev_sci_dispatch); /* Are there any host-installed SCI handlers? */ if (!acpi_gbl_sci_handler_list) { return (int_status); } flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); /* Invoke all host-installed SCI handlers */ sci_handler = acpi_gbl_sci_handler_list; while (sci_handler) { /* Invoke the installed handler (at interrupt level) */ int_status |= sci_handler->address(sci_handler->context); sci_handler = sci_handler->next; } acpi_os_release_lock(acpi_gbl_gpe_lock, flags); return (int_status); }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng86100.00%1100.00%
Total86100.00%1100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_sci_xrupt_handler * * PARAMETERS: context - Calling Context * * RETURN: Status code indicates whether interrupt was handled. * * DESCRIPTION: Interrupt handler that will figure out what function or * control method to call to deal with a SCI. * ******************************************************************************/
static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context) { struct acpi_gpe_xrupt_info *gpe_xrupt_list = context; u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED; ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler); /* * We are guaranteed by the ACPICA initialization/shutdown code that * if this interrupt handler is installed, ACPI is enabled. */ /* * Fixed Events: * Check for and dispatch any Fixed Events that have occurred */ interrupt_handled |= acpi_ev_fixed_event_detect(); /* * General Purpose Events: * Check for and dispatch any GPEs that have occurred */ interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list); /* Invoke all host-installed SCI handlers */ interrupt_handled |= acpi_ev_sci_dispatch(); acpi_sci_count++; return_UINT32(interrupt_handled); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover2238.60%327.27%
Linus Torvalds (pre-git)2035.09%218.18%
Lv Zheng915.79%218.18%
Linus Torvalds35.26%19.09%
Robert Moore35.26%327.27%
Total57100.00%11100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_gpe_xrupt_handler * * PARAMETERS: context - Calling Context * * RETURN: Status code indicates whether interrupt was handled. * * DESCRIPTION: Handler for GPE Block Device interrupts * ******************************************************************************/
u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context) { struct acpi_gpe_xrupt_info *gpe_xrupt_list = context; u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED; ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler); /* * We are guaranteed by the ACPICA initialization/shutdown code that * if this interrupt handler is installed, ACPI is enabled. */ /* GPEs: Check for and dispatch any GPEs that have occurred */ interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list); return_UINT32(interrupt_handled); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover3175.61%114.29%
Linus Torvalds37.32%114.29%
Linus Torvalds (pre-git)37.32%114.29%
Robert Moore37.32%342.86%
Lv Zheng12.44%114.29%
Total41100.00%7100.00%

/****************************************************************************** * * FUNCTION: acpi_ev_install_sci_handler * * PARAMETERS: none * * RETURN: Status * * DESCRIPTION: Installs SCI handler. * ******************************************************************************/
u32 acpi_ev_install_sci_handler(void) { u32 status = AE_OK; ACPI_FUNCTION_TRACE(ev_install_sci_handler); status = acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt, acpi_ev_sci_xrupt_handler, acpi_gbl_gpe_xrupt_list_head); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2155.26%225.00%
Linus Torvalds1026.32%112.50%
Andy Grover37.89%225.00%
Robert Moore37.89%225.00%
Len Brown12.63%112.50%
Total38100.00%8100.00%

/****************************************************************************** * * FUNCTION: acpi_ev_remove_all_sci_handlers * * PARAMETERS: none * * RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not * installed to begin with * * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be * taken. Remove all host-installed SCI handlers. * * Note: It doesn't seem important to disable all events or set the event * enable registers to their original values. The OS should disable * the SCI interrupt level when the handler is removed, so no more * events will come in. * ******************************************************************************/
acpi_status acpi_ev_remove_all_sci_handlers(void) { struct acpi_sci_handler_info *sci_handler; acpi_cpu_flags flags; acpi_status status; ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers); /* Just let the OS remove the handler and disable the level */ status = acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt, acpi_ev_sci_xrupt_handler); if (!acpi_gbl_sci_handler_list) { return (status); } flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); /* Free all host-installed SCI handlers */ while (acpi_gbl_sci_handler_list) { sci_handler = acpi_gbl_sci_handler_list; acpi_gbl_sci_handler_list = sci_handler->next; ACPI_FREE(sci_handler); } acpi_os_release_lock(acpi_gbl_gpe_lock, flags); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng5863.74%111.11%
Linus Torvalds (pre-git)1415.38%222.22%
Andy Grover99.89%333.33%
Linus Torvalds77.69%111.11%
Robert Moore22.20%111.11%
Len Brown11.10%111.11%
Total91100.00%9100.00%

#endif /* !ACPI_REDUCED_HARDWARE */

Overall Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng15643.58%28.00%
Andy Grover6818.99%624.00%
Linus Torvalds (pre-git)6818.99%28.00%
Robert Moore3710.34%1040.00%
Linus Torvalds246.70%28.00%
Len Brown41.12%28.00%
Patrick Mochel10.28%14.00%
Total358100.00%25100.00%
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