NetBSD-5.0.2/sys/dev/acpi/acpica/OsdSynch.c
/* $NetBSD: OsdSynch.c,v 1.10.20.1 2009/02/02 20:37:34 snj Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
*/
/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
*/
/*
* OS Services Layer
*
* 6.4: Mutual Exclusion and Synchronization
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: OsdSynch.c,v 1.10.20.1 2009/02/02 20:37:34 snj Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/kernel.h>
#include <sys/proc.h>
extern int acpi_suspended;
#include <dev/acpi/acpica.h>
MALLOC_DECLARE(M_ACPI);
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("SYNCH")
/*
* Simple counting semaphore implemented using a mutex. This is
* subsequently used in the OSI code to implement a mutex. Go figure.
*/
struct acpi_semaphore {
kcondvar_t as_cv;
kmutex_t as_slock;
UINT32 as_units;
UINT32 as_maxunits;
};
struct acpi_lock {
kmutex_t al_slock;
};
/*
* AcpiOsCreateSemaphore:
*
* Create a semaphore.
*/
ACPI_STATUS
AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits,
ACPI_HANDLE *OutHandle)
{
struct acpi_semaphore *as;
ACPI_FUNCTION_TRACE(__func__);
if (OutHandle == NULL)
return_ACPI_STATUS(AE_BAD_PARAMETER);
if (InitialUnits > MaxUnits)
return_ACPI_STATUS(AE_BAD_PARAMETER);
as = malloc(sizeof(*as), M_ACPI, M_NOWAIT);
if (as == NULL)
return_ACPI_STATUS(AE_NO_MEMORY);
mutex_init(&as->as_slock, MUTEX_DEFAULT, IPL_NONE);
cv_init(&as->as_cv, "acpisem");
as->as_units = InitialUnits;
as->as_maxunits = MaxUnits;
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"created semaphore %p max %u initial %u\n",
as, as->as_maxunits, as->as_units));
*OutHandle = (ACPI_HANDLE) as;
return_ACPI_STATUS(AE_OK);
}
/*
* AcpiOsDeleteSemaphore:
*
* Delete a semaphore.
*/
ACPI_STATUS
AcpiOsDeleteSemaphore(ACPI_HANDLE Handle)
{
struct acpi_semaphore *as = (void *) Handle;
ACPI_FUNCTION_TRACE(__func__);
if (as == NULL)
return_ACPI_STATUS(AE_BAD_PARAMETER);
cv_destroy(&as->as_cv);
mutex_destroy(&as->as_slock);
free(as, M_ACPI);
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
return_ACPI_STATUS(AE_OK);
}
/*
* AcpiOsWaitSemaphore:
*
* Wait for units from a semaphore.
*/
ACPI_STATUS
AcpiOsWaitSemaphore(ACPI_SEMAPHORE Handle, UINT32 Units, UINT16 Timeout)
{
struct acpi_semaphore *as = (void *) Handle;
ACPI_STATUS rv;
int timo, error;
/*
* This implementation has a bug: It has to stall for the entire
* timeout before it will return AE_TIME. A better implementation
* would adjust the amount of time left after being awakened.
*/
ACPI_FUNCTION_TRACE(__func__);
if (as == NULL)
return_ACPI_STATUS(AE_BAD_PARAMETER);
if (cold || acpi_suspended)
return_ACPI_STATUS(AE_OK);
/* A timeout of 0xFFFF means "forever". */
if (Timeout == 0xFFFF)
timo = 0;
else {
/* Compute the timeout using uSec per tick. */
timo = (Timeout * 1000) / (1000000 / hz);
if (timo <= 0)
timo = 1;
}
mutex_enter(&as->as_slock);
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"get %d units from semaphore %p (has %d) timeout %d\n",
Units, as, as->as_units, Timeout));
for (;;) {
if (as->as_units >= Units) {
as->as_units -= Units;
rv = AE_OK;
break;
}
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"semaphore blocked, sleeping %d ticks\n", timo));
error = cv_timedwait(&as->as_cv, &as->as_slock, timo);
if (error == EWOULDBLOCK) {
rv = AE_TIME;
break;
}
}
mutex_exit(&as->as_slock);
return_ACPI_STATUS(rv);
}
/*
* AcpiOsSignalSemaphore:
*
* Send units to a semaphore.
*/
ACPI_STATUS
AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
{
struct acpi_semaphore *as = (void *) Handle;
ACPI_FUNCTION_TRACE(__func__);
if (as == NULL)
return_ACPI_STATUS(AE_BAD_PARAMETER);
mutex_enter(&as->as_slock);
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"return %d units to semaphore %p (has %d)\n",
Units, as, as->as_units));
as->as_units += Units;
if (as->as_units > as->as_maxunits)
as->as_units = as->as_maxunits;
cv_broadcast(&as->as_cv);
mutex_exit(&as->as_slock);
return_ACPI_STATUS(AE_OK);
}
/*
* AcpiOsCreateLock:
*
* Create a lock.
*/
ACPI_STATUS
AcpiOsCreateLock(ACPI_HANDLE *OutHandle)
{
struct acpi_lock *al;
ACPI_FUNCTION_TRACE(__func__);
if (OutHandle == NULL)
return_ACPI_STATUS(AE_BAD_PARAMETER);
al = malloc(sizeof(*al), M_ACPI, M_NOWAIT);
if (al == NULL)
return_ACPI_STATUS(AE_NO_MEMORY);
mutex_init(&al->al_slock, MUTEX_DEFAULT, IPL_VM);
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"created lock %p\n", al));
*OutHandle = (ACPI_HANDLE) al;
return_ACPI_STATUS(AE_OK);
}
/*
* AcpiOsDeleteLock:
*
* Delete a lock.
*/
void
AcpiOsDeleteLock(ACPI_SPINLOCK Handle)
{
struct acpi_lock *al = (void *) Handle;
ACPI_FUNCTION_TRACE(__func__);
if (al == NULL)
return;
mutex_destroy(&al->al_slock);
free(al, M_ACPI);
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed lock %p\n", al));
return;
}
/*
* AcpiOsAcquireLock:
*
* Acquire a lock.
*/
ACPI_NATIVE_UINT
AcpiOsAcquireLock(ACPI_SPINLOCK Handle)
{
struct acpi_lock *al = (void *) Handle;
ACPI_FUNCTION_TRACE(__func__);
if (al == NULL)
return 0;
mutex_enter(&al->al_slock);
return 0;
}
/*
* AcpiOsReleaseLock:
*
* Release a lock.
*/
void
AcpiOsReleaseLock(ACPI_HANDLE Handle, ACPI_NATIVE_UINT Flags)
{
struct acpi_lock *al = (void *) Handle;
ACPI_FUNCTION_TRACE(__func__);
if (al == NULL)
return;
mutex_exit(&al->al_slock);
return;
}