OsdSchedule.c revision 167814 
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
28/*
29 * 6.3 : Scheduling services
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/dev/acpica/Osd/OsdSchedule.c 167814 2007-03-22 18:16:43Z jkim $");
34
35#include "opt_acpi.h"
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/bus.h>
39#include <sys/interrupt.h>
40#include <sys/kernel.h>
41#include <sys/kthread.h>
42#include <sys/malloc.h>
43#include <sys/proc.h>
44#include <sys/taskqueue.h>
45
46#include <contrib/dev/acpica/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
67TASKQUEUE_DEFINE(acpi, taskqueue_thread_enqueue, &taskqueue_acpi,
68    taskqueue_start_threads(&taskqueue_acpi, acpi_max_threads, PWAIT,
69    "acpi_task"));
70
71/*
72 * Bounce through this wrapper function since ACPI-CA doesn't understand
73 * the pending argument for its callbacks.
74 */
75static void
76acpi_task_execute(void *context, int pending)
77{
78    struct acpi_task_ctx *at;
79
80    at = (struct acpi_task_ctx *)context;
81    at->at_function(at->at_context);
82    free(at, M_ACPITASK);
83}
84
85/*
86 * This function may be called in interrupt context, i.e. when a GPE fires.
87 * We allocate and queue a task for one of our taskqueue threads to process.
88 */
89ACPI_STATUS
90AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
91    void *Context)
92{
93    struct acpi_task_ctx *at;
94    int pri;
95
96    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
97
98    if (Function == NULL)
99	return_ACPI_STATUS (AE_BAD_PARAMETER);
100
101    at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT);
102    if (at == NULL)
103	return_ACPI_STATUS (AE_NO_MEMORY);
104
105    at->at_function = Function;
106    at->at_context = Context;
107    switch (Type) {
108    case OSL_GPE_HANDLER:
109	pri = 10;
110	break;
111    case OSL_GLOBAL_LOCK_HANDLER:
112    case OSL_EC_POLL_HANDLER:
113    case OSL_EC_BURST_HANDLER:
114	pri = 5;
115	break;
116    case OSL_NOTIFY_HANDLER:
117	pri = 3;
118	break;
119    case OSL_DEBUGGER_THREAD:
120	pri = 0;
121	break;
122    default:
123	free(at, M_ACPITASK);
124	return_ACPI_STATUS (AE_BAD_PARAMETER);
125    }
126
127    TASK_INIT(&at->at_task, pri, acpi_task_execute, at);
128    taskqueue_enqueue(taskqueue_acpi, &at->at_task);
129
130    return_ACPI_STATUS (AE_OK);
131}
132
133void
134AcpiOsSleep(ACPI_INTEGER Milliseconds)
135{
136    int		timo;
137
138    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
139
140    timo = Milliseconds * hz / 1000;
141
142    /*
143     * If requested sleep time is less than our hz resolution, use
144     * DELAY instead for better granularity.
145     */
146    if (timo > 0)
147	pause("acpislp", timo);
148    else
149	DELAY(Milliseconds * 1000);
150
151    return_VOID;
152}
153
154/*
155 * Return the current time in 100 nanosecond units
156 */
157UINT64
158AcpiOsGetTimer(void)
159{
160    struct bintime bt;
161    UINT64 t;
162
163    /* XXX During early boot there is no (decent) timer available yet. */
164    if (cold)
165	panic("acpi: timer op not yet supported during boot");
166
167    binuptime(&bt);
168    t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
169    t += bt.sec * 10000000;
170
171    return (t);
172}
173
174void
175AcpiOsStall(UINT32 Microseconds)
176{
177    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
178
179    DELAY(Microseconds);
180    return_VOID;
181}
182
183ACPI_THREAD_ID
184AcpiOsGetThreadId(void)
185{
186    struct proc *p;
187
188    /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
189
190    p = curproc;
191    KASSERT(p != NULL, ("%s: curproc is NULL!", __func__));
192
193    /* Returning 0 is not allowed. */
194    return (p->p_pid + 1);
195}
196