OsdSchedule.c revision 146021 
1/*-
2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *	$FreeBSD: head/sys/dev/acpica/Osd/OsdSchedule.c 146021 2005-05-09 07:34:04Z marks $
28 */
29
30/*
31 * 6.3 : Scheduling services
32 */
33
34#include "opt_acpi.h"
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/interrupt.h>
39#include <sys/kernel.h>
40#include <sys/kthread.h>
41#include <sys/malloc.h>
42#include <sys/proc.h>
43#include <sys/taskqueue.h>
44#include <machine/clock.h>
45
46#include "acpi.h"
47#include <dev/acpica/acpivar.h>
48
49#define _COMPONENT	ACPI_OS_SERVICES
50ACPI_MODULE_NAME("SCHEDULE")
51
52/*
53 * Allow the user to tune the number of task threads we start.  It seems
54 * some systems have problems with increased parallelism.
55 */
56static int acpi_max_threads = ACPI_MAX_THREADS;
57TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
58
59MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
60
61struct acpi_task_ctx {
62    struct task			at_task;
63    ACPI_OSD_EXEC_CALLBACK	at_function;
64    void 			*at_context;
65};
66
67/*
68 * Private task queue definition for ACPI
69 */
70static struct proc *
71acpi_task_start_threads(struct taskqueue **tqp)
72{
73    struct proc	*acpi_kthread_proc;
74    int	err, i;
75
76    KASSERT(*tqp != NULL, ("acpi taskqueue not created before threads"));
77
78    /* Start one or more threads to service our taskqueue. */
79    for (i = 0; i < acpi_max_threads; i++) {
80	err = kthread_create(taskqueue_thread_loop, tqp, &acpi_kthread_proc,
81	    0, 0, "acpi_task%d", i);
82	if (err) {
83	    printf("%s: kthread_create failed (%d)\n", __func__, err);
84	    break;
85	}
86    }
87    return (acpi_kthread_proc);
88}
89
90TASKQUEUE_DEFINE(acpi, taskqueue_thread_enqueue, &taskqueue_acpi,
91    taskqueue_acpi_proc = acpi_task_start_threads(&taskqueue_acpi));
92
93/*
94 * Bounce through this wrapper function since ACPI-CA doesn't understand
95 * the pending argument for its callbacks.
96 */
97static void
98acpi_task_execute(void *context, int pending)
99{
100    struct acpi_task_ctx *at;
101
102    at = (struct acpi_task_ctx *)context;
103    at->at_function(at->at_context);
104    free(at, M_ACPITASK);
105}
106
107/*
108 * This function may be called in interrupt context, i.e. when a GPE fires.
109 * We allocate and queue a task for one of our taskqueue threads to process.
110 */
111ACPI_STATUS
112AcpiOsQueueForExecution(UINT32 Priority, ACPI_OSD_EXEC_CALLBACK Function,
113    void *Context)
114{
115    struct acpi_task_ctx *at;
116    int pri;
117
118    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
119
120    if (Function == NULL)
121	return_ACPI_STATUS (AE_BAD_PARAMETER);
122
123    at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT);
124    if (at == NULL)
125	return_ACPI_STATUS (AE_NO_MEMORY);
126
127    at->at_function = Function;
128    at->at_context = Context;
129    switch (Priority) {
130    case OSD_PRIORITY_GPE:
131	pri = 4;
132	break;
133    case OSD_PRIORITY_HIGH:
134	pri = 3;
135	break;
136    case OSD_PRIORITY_MED:
137	pri = 2;
138	break;
139    case OSD_PRIORITY_LO:
140	pri = 1;
141	break;
142    default:
143	free(at, M_ACPITASK);
144	return_ACPI_STATUS (AE_BAD_PARAMETER);
145    }
146
147    TASK_INIT(&at->at_task, pri, acpi_task_execute, at);
148    taskqueue_enqueue(taskqueue_acpi, &at->at_task);
149
150    return_ACPI_STATUS (AE_OK);
151}
152
153void
154AcpiOsSleep(ACPI_INTEGER Milliseconds)
155{
156    int		timo;
157    static int	dummy;
158
159    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
160
161    timo = Milliseconds * hz / 1000;
162
163    /*
164     * If requested sleep time is less than our hz resolution, use
165     * DELAY instead for better granularity.
166     */
167    if (timo > 0)
168	tsleep(&dummy, 0, "acpislp", timo);
169    else
170	DELAY(Milliseconds * 1000);
171
172    return_VOID;
173}
174
175/*
176 * Return the current time in 100 nanosecond units
177 */
178UINT64
179AcpiOsGetTimer(void)
180{
181    struct bintime bt;
182    UINT64 t;
183
184    /* XXX During early boot there is no (decent) timer available yet. */
185    if (cold)
186	panic("acpi: timer op not yet supported during boot");
187
188    binuptime(&bt);
189    t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
190    t += bt.sec * 10000000;
191
192    return (t);
193}
194
195void
196AcpiOsStall(UINT32 Microseconds)
197{
198    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
199
200    DELAY(Microseconds);
201    return_VOID;
202}
203
204UINT32
205AcpiOsGetThreadId(void)
206{
207    struct proc *p;
208
209    /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
210
211    p = curproc;
212    KASSERT(p != NULL, ("%s: curproc is NULL!", __func__));
213
214    /* Returning 0 is not allowed. */
215    return (p->p_pid + 1);
216}
217