freebsd-nq/sys/dev/acpica/Osd/OsdSchedule.c

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/*-
* 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.
*
* $FreeBSD$
*/
/*
* 6.3 : Scheduling services
*/
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/taskqueue.h>
#include <machine/clock.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("SCHEDULE")
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/*
* Allow the user to tune the number of task threads we start. It seems
* some systems have problems with increased parallelism.
*/
static int acpi_max_threads = ACPI_MAX_THREADS;
TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
/*
* This is a little complicated due to the fact that we need to build and then
* free a 'struct task' for each task we enqueue.
*/
MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
static void AcpiOsExecuteQueue(void *arg, int pending);
struct acpi_task {
struct task at_task;
ACPI_OSD_EXEC_CALLBACK at_function;
void *at_context;
};
struct acpi_task_queue {
STAILQ_ENTRY(acpi_task_queue) at_q;
struct acpi_task *at;
};
/*
* Private task queue definition for ACPI
*/
TASKQUEUE_DECLARE(acpi);
static void *taskqueue_acpi_ih;
static void
taskqueue_acpi_enqueue(void *context)
{
Change the preemption code for software interrupt thread schedules and mutex releases to not require flags for the cases when preemption is not allowed: The purpose of the MTX_NOSWITCH and SWI_NOSWITCH flags is to prevent switching to a higher priority thread on mutex releease and swi schedule, respectively when that switch is not safe. Now that the critical section API maintains a per-thread nesting count, the kernel can easily check whether or not it should switch without relying on flags from the programmer. This fixes a few bugs in that all current callers of swi_sched() used SWI_NOSWITCH, when in fact, only the ones called from fast interrupt handlers and the swi_sched of softclock needed this flag. Note that to ensure that swi_sched()'s in clock and fast interrupt handlers do not switch, these handlers have to be explicitly wrapped in critical_enter/exit pairs. Presently, just wrapping the handlers is sufficient, but in the future with the fully preemptive kernel, the interrupt must be EOI'd before critical_exit() is called. (critical_exit() can switch due to a deferred preemption in a fully preemptive kernel.) I've tested the changes to the interrupt code on i386 and alpha. I have not tested ia64, but the interrupt code is almost identical to the alpha code, so I expect it will work fine. PowerPC and ARM do not yet have interrupt code in the tree so they shouldn't be broken. Sparc64 is broken, but that's been ok'd by jake and tmm who will be fixing the interrupt code for sparc64 shortly. Reviewed by: peter Tested on: i386, alpha
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swi_sched(taskqueue_acpi_ih, 0);
}
static void
taskqueue_acpi_run(void *dummy)
{
taskqueue_run(taskqueue_acpi);
}
TASKQUEUE_DEFINE(acpi, taskqueue_acpi_enqueue, 0,
swi_add(NULL, "acpitaskq", taskqueue_acpi_run, NULL,
SWI_TQ, 0, &taskqueue_acpi_ih));
static STAILQ_HEAD(, acpi_task_queue) acpi_task_queue;
ACPI_LOCK_DECL(taskq, "ACPI task queue");
static void
acpi_task_thread(void *arg)
{
struct acpi_task_queue *atq;
ACPI_OSD_EXEC_CALLBACK Function;
void *Context;
ACPI_LOCK(taskq);
for (;;) {
while ((atq = STAILQ_FIRST(&acpi_task_queue)) == NULL)
msleep(&acpi_task_queue, &taskq_mutex, PCATCH, "actask", 0);
STAILQ_REMOVE_HEAD(&acpi_task_queue, at_q);
ACPI_UNLOCK(taskq);
Function = (ACPI_OSD_EXEC_CALLBACK)atq->at->at_function;
Context = atq->at->at_context;
Function(Context);
free(atq->at, M_ACPITASK);
free(atq, M_ACPITASK);
ACPI_LOCK(taskq);
}
kthread_exit(0);
}
int
acpi_task_thread_init(void)
{
int i, err;
struct proc *acpi_kthread_proc;
err = 0;
STAILQ_INIT(&acpi_task_queue);
for (i = 0; i < acpi_max_threads; i++) {
err = kthread_create(acpi_task_thread, NULL, &acpi_kthread_proc,
0, 0, "acpi_task%d", i);
if (err != 0) {
printf("%s: kthread_create failed(%d)\n", __func__, err);
break;
}
}
return (err);
}
/* This function is called in interrupt context. */
ACPI_STATUS
AcpiOsQueueForExecution(UINT32 Priority, ACPI_OSD_EXEC_CALLBACK Function,
void *Context)
{
struct acpi_task *at;
int pri;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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if (Function == NULL)
return_ACPI_STATUS (AE_BAD_PARAMETER);
at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT | M_ZERO);
if (at == NULL)
return_ACPI_STATUS (AE_NO_MEMORY);
at->at_function = Function;
at->at_context = Context;
switch (Priority) {
case OSD_PRIORITY_GPE:
pri = 4;
break;
case OSD_PRIORITY_HIGH:
pri = 3;
break;
case OSD_PRIORITY_MED:
pri = 2;
break;
case OSD_PRIORITY_LO:
pri = 1;
break;
default:
free(at, M_ACPITASK);
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
TASK_INIT(&at->at_task, pri, AcpiOsExecuteQueue, at);
taskqueue_enqueue(taskqueue_acpi, (struct task *)at);
return_ACPI_STATUS (AE_OK);
}
static void
AcpiOsExecuteQueue(void *arg, int pending)
{
struct acpi_task_queue *atq;
ACPI_OSD_EXEC_CALLBACK Function;
void *Context;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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atq = NULL;
Function = NULL;
Context = NULL;
atq = malloc(sizeof(*atq), M_ACPITASK, M_NOWAIT);
if (atq == NULL) {
printf("%s: no memory\n", __func__);
return;
}
atq->at = (struct acpi_task *)arg;
ACPI_LOCK(taskq);
STAILQ_INSERT_TAIL(&acpi_task_queue, atq, at_q);
wakeup_one(&acpi_task_queue);
ACPI_UNLOCK(taskq);
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return_VOID;
}
void
AcpiOsSleep(ACPI_INTEGER Milliseconds)
{
int timo;
static int dummy;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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timo = Milliseconds * hz / 1000;
/*
* If requested sleep time is less than our hz resolution, use
* DELAY instead for better granularity.
*/
if (timo > 0)
tsleep(&dummy, 0, "acpislp", timo);
else
DELAY(Milliseconds * 1000);
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return_VOID;
}
/*
* Return the current time in 100 nanosecond units
*/
UINT64
AcpiOsGetTimer(void)
{
struct bintime bt;
UINT64 t;
/* XXX During early boot there is no (decent) timer available yet. */
if (cold)
panic("acpi: timer op not yet supported during boot");
binuptime(&bt);
t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
t += bt.sec * 10000000;
return (t);
}
void
AcpiOsStall(UINT32 Microseconds)
{
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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DELAY(Microseconds);
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return_VOID;
}
UINT32
AcpiOsGetThreadId(void)
{
struct proc *p;
/* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
p = curproc;
KASSERT(p != NULL, ("%s: curproc is NULL!", __func__));
/* Returning 0 is not allowed. */
return (p->p_pid + 1);
}