mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
341 lines
9.0 KiB
C
341 lines
9.0 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 6.1 : Mutual Exclusion and Synchronisation
|
|
*/
|
|
|
|
#include "acpi.h"
|
|
|
|
#include "opt_acpi.h"
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/sysctl.h>
|
|
#if __FreeBSD_version >= 500000
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#endif
|
|
|
|
#define _COMPONENT ACPI_OS_SERVICES
|
|
ACPI_MODULE_NAME("SYNCH")
|
|
|
|
static MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
|
|
|
|
#if __FreeBSD_version < 500000
|
|
# define AS_LOCK(as) s = splhigh()
|
|
# define AS_UNLOCK(as) splx(s)
|
|
# define AS_LOCK_DECL int s
|
|
# define msleep(a, b, c, d, e) tsleep(a, c, d, e)
|
|
#else
|
|
# define AS_LOCK(as) mtx_lock(&(as)->as_mtx)
|
|
# define AS_UNLOCK(as) mtx_unlock(&(as)->as_mtx)
|
|
# define AS_LOCK_DECL
|
|
#endif
|
|
|
|
/*
|
|
* Simple counting semaphore implemented using a mutex. (Subsequently used
|
|
* in the OSI code to implement a mutex. Go figure.)
|
|
*/
|
|
struct acpi_semaphore {
|
|
#if __FreeBSD_version >= 500000
|
|
struct mtx as_mtx;
|
|
#endif
|
|
UINT32 as_units;
|
|
UINT32 as_maxunits;
|
|
UINT32 as_pendings;
|
|
UINT32 as_resetting;
|
|
UINT32 as_timeouts;
|
|
};
|
|
|
|
#ifndef ACPI_NO_SEMAPHORES
|
|
#ifndef ACPI_SEMAPHORES_MAX_PENDING
|
|
#define ACPI_SEMAPHORES_MAX_PENDING 4
|
|
#endif
|
|
static int acpi_semaphore_debug = 0;
|
|
TUNABLE_INT("debug.acpi_semaphore_debug", &acpi_semaphore_debug);
|
|
SYSCTL_INT(_debug, OID_AUTO, acpi_semaphore_debug, CTLFLAG_RW,
|
|
&acpi_semaphore_debug, 0, "");
|
|
#endif
|
|
|
|
ACPI_STATUS
|
|
AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits, ACPI_HANDLE *OutHandle)
|
|
{
|
|
#ifndef ACPI_NO_SEMAPHORES
|
|
struct acpi_semaphore *as;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
if (OutHandle == NULL)
|
|
return(AE_BAD_PARAMETER);
|
|
if (InitialUnits > MaxUnits)
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
|
|
if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT)) == NULL)
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
|
|
bzero(as, sizeof(*as));
|
|
#if __FreeBSD_version >= 500000
|
|
mtx_init(&as->as_mtx, "ACPI semaphore", NULL, MTX_DEF);
|
|
#endif
|
|
as->as_units = InitialUnits;
|
|
as->as_maxunits = MaxUnits;
|
|
as->as_pendings = as->as_resetting = as->as_timeouts = 0;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
|
|
"created semaphore %p max %d, initial %d\n",
|
|
as, InitialUnits, MaxUnits));
|
|
|
|
*OutHandle = (ACPI_HANDLE)as;
|
|
return_ACPI_STATUS(AE_OK);
|
|
#else
|
|
*OutHandle = (ACPI_HANDLE)OutHandle;
|
|
return(AE_OK);
|
|
#endif
|
|
}
|
|
|
|
ACPI_STATUS
|
|
AcpiOsDeleteSemaphore (ACPI_HANDLE Handle)
|
|
{
|
|
#ifndef ACPI_NO_SEMAPHORES
|
|
struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
|
|
#if __FreeBSD_version >= 500000
|
|
mtx_destroy(&as->as_mtx);
|
|
#endif
|
|
free(Handle, M_ACPISEM);
|
|
return_ACPI_STATUS(AE_OK);
|
|
#else
|
|
return(AE_OK);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* This implementation has a bug, in that it has to stall for the entire
|
|
* timeout before it will return AE_TIME. A better implementation would
|
|
* use getmicrotime() to correctly adjust the timeout after being woken up.
|
|
*/
|
|
ACPI_STATUS
|
|
AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT16 Timeout)
|
|
{
|
|
#ifndef ACPI_NO_SEMAPHORES
|
|
struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
|
|
ACPI_STATUS result;
|
|
int rv, tmo;
|
|
struct timeval timeouttv, currenttv, timelefttv;
|
|
AS_LOCK_DECL;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
if (as == NULL)
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
|
|
if (cold)
|
|
return_ACPI_STATUS(AE_OK);
|
|
|
|
#if 0
|
|
if (as->as_units < Units && as->as_timeouts > 10) {
|
|
printf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
|
|
AS_LOCK(as);
|
|
as->as_units = as->as_maxunits;
|
|
if (as->as_pendings)
|
|
as->as_resetting = 1;
|
|
as->as_timeouts = 0;
|
|
wakeup(as);
|
|
AS_UNLOCK(as);
|
|
return_ACPI_STATUS(AE_TIME);
|
|
}
|
|
|
|
if (as->as_resetting) {
|
|
return_ACPI_STATUS(AE_TIME);
|
|
}
|
|
#endif
|
|
|
|
/* a timeout of ACPI_WAIT_FOREVER means "forever" */
|
|
if (Timeout == ACPI_WAIT_FOREVER) {
|
|
tmo = 0;
|
|
timeouttv.tv_sec = ((0xffff/1000) + 1); /* cf. ACPI spec */
|
|
timeouttv.tv_usec = 0;
|
|
} else {
|
|
/* compute timeout using microseconds per tick */
|
|
tmo = (Timeout * 1000) / (1000000 / hz);
|
|
if (tmo <= 0)
|
|
tmo = 1;
|
|
timeouttv.tv_sec = Timeout / 1000;
|
|
timeouttv.tv_usec = (Timeout % 1000) * 1000;
|
|
}
|
|
|
|
/* calculate timeout value in timeval */
|
|
getmicrotime(¤ttv);
|
|
timevaladd(&timeouttv, ¤ttv);
|
|
|
|
AS_LOCK(as);
|
|
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_maxunits == ACPI_NO_UNIT_LIMIT) {
|
|
result = AE_OK;
|
|
break;
|
|
}
|
|
if (as->as_units >= Units) {
|
|
as->as_units -= Units;
|
|
result = AE_OK;
|
|
break;
|
|
}
|
|
|
|
/* limit number of pending treads */
|
|
if (as->as_pendings >= ACPI_SEMAPHORES_MAX_PENDING) {
|
|
result = AE_TIME;
|
|
break;
|
|
}
|
|
|
|
/* if timeout values of zero is specified, return immediately */
|
|
if (Timeout == 0) {
|
|
result = AE_TIME;
|
|
break;
|
|
}
|
|
|
|
#if __FreeBSD_version >= 500000
|
|
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
|
|
"semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
|
|
as, &as->as_mtx, PCATCH, tmo));
|
|
#endif
|
|
|
|
as->as_pendings++;
|
|
|
|
if (acpi_semaphore_debug) {
|
|
printf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
|
|
__func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
|
|
}
|
|
|
|
rv = msleep(as, &as->as_mtx, PCATCH, "acsem", tmo);
|
|
|
|
as->as_pendings--;
|
|
|
|
#if 0
|
|
if (as->as_resetting) {
|
|
/* semaphore reset, return immediately */
|
|
if (as->as_pendings == 0) {
|
|
as->as_resetting = 0;
|
|
}
|
|
result = AE_TIME;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "msleep(%d) returned %d\n", tmo, rv));
|
|
if (rv == EWOULDBLOCK) {
|
|
result = AE_TIME;
|
|
break;
|
|
}
|
|
|
|
/* check if we already awaited enough */
|
|
timelefttv = timeouttv;
|
|
getmicrotime(¤ttv);
|
|
timevalsub(&timelefttv, ¤ttv);
|
|
if (timelefttv.tv_sec < 0) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "await semaphore %p timeout\n", as));
|
|
result = AE_TIME;
|
|
break;
|
|
}
|
|
|
|
/* adjust timeout for the next sleep */
|
|
tmo = (timelefttv.tv_sec * 1000000 + timelefttv.tv_usec) / (1000000 / hz);
|
|
if (tmo <= 0)
|
|
tmo = 1;
|
|
|
|
if (acpi_semaphore_debug) {
|
|
printf("%s: Wakeup timeleft(%lu, %lu), tmo %u, semaphore %p, thread %d\n",
|
|
__func__, timelefttv.tv_sec, timelefttv.tv_usec, tmo, as, AcpiOsGetThreadId());
|
|
}
|
|
}
|
|
|
|
if (acpi_semaphore_debug) {
|
|
if (result == AE_TIME && Timeout > 0) {
|
|
printf("%s: Timeout %d, pending %d, semaphore %p\n",
|
|
__func__, Timeout, as->as_pendings, as);
|
|
}
|
|
if (result == AE_OK && (as->as_timeouts > 0 || as->as_pendings > 0)) {
|
|
printf("%s: Acquire %d, units %d, pending %d, semaphore %p, thread %d\n",
|
|
__func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
|
|
}
|
|
}
|
|
|
|
if (result == AE_TIME) {
|
|
as->as_timeouts++;
|
|
} else {
|
|
as->as_timeouts = 0;
|
|
}
|
|
|
|
AS_UNLOCK(as);
|
|
|
|
return_ACPI_STATUS(result);
|
|
#else
|
|
return(AE_OK);
|
|
#endif
|
|
}
|
|
|
|
ACPI_STATUS
|
|
AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
|
|
{
|
|
#ifndef ACPI_NO_SEMAPHORES
|
|
struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
|
|
AS_LOCK_DECL;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
|
|
|
|
if (as == NULL)
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
|
|
AS_LOCK(as);
|
|
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
|
|
"return %d units to semaphore %p (has %d)\n",
|
|
Units, as, as->as_units));
|
|
if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
|
|
as->as_units += Units;
|
|
if (as->as_units > as->as_maxunits)
|
|
as->as_units = as->as_maxunits;
|
|
}
|
|
|
|
if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
|
|
printf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
|
|
__func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
|
|
}
|
|
|
|
wakeup(as);
|
|
AS_UNLOCK(as);
|
|
return_ACPI_STATUS(AE_OK);
|
|
#else
|
|
return(AE_OK);
|
|
#endif
|
|
}
|