OsdSchedule.c revision 133627 
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 133627 2004-08-13 06:22:26Z njl $
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 * This is a little complicated due to the fact that we need to build and then
54 * free a 'struct task' for each task we enqueue.
55 */
56
57MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
58
59static void	AcpiOsExecuteQueue(void *arg, int pending);
60
61struct acpi_task {
62    struct task			at_task;
63    OSD_EXECUTION_CALLBACK	at_function;
64    void			*at_context;
65};
66
67struct acpi_task_queue {
68    STAILQ_ENTRY(acpi_task_queue) at_q;
69    struct acpi_task		*at;
70};
71
72/*
73 * Private task queue definition for ACPI
74 */
75TASKQUEUE_DECLARE(acpi);
76static void	*taskqueue_acpi_ih;
77
78static void
79taskqueue_acpi_enqueue(void *context)
80{
81    swi_sched(taskqueue_acpi_ih, 0);
82}
83
84static void
85taskqueue_acpi_run(void *dummy)
86{
87    taskqueue_run(taskqueue_acpi);
88}
89
90TASKQUEUE_DEFINE(acpi, taskqueue_acpi_enqueue, 0,
91		 swi_add(NULL, "acpitaskq", taskqueue_acpi_run, NULL,
92		     SWI_TQ, 0, &taskqueue_acpi_ih));
93
94static STAILQ_HEAD(, acpi_task_queue) acpi_task_queue;
95ACPI_LOCK_DECL(taskq, "ACPI task queue");
96
97static void
98acpi_task_thread(void *arg)
99{
100    struct acpi_task_queue	*atq;
101    OSD_EXECUTION_CALLBACK	Function;
102    void			*Context;
103
104    ACPI_LOCK(taskq);
105    for (;;) {
106	while ((atq = STAILQ_FIRST(&acpi_task_queue)) == NULL)
107	    msleep(&acpi_task_queue, &taskq_mutex, PCATCH, "actask", 0);
108	STAILQ_REMOVE_HEAD(&acpi_task_queue, at_q);
109	ACPI_UNLOCK(taskq);
110
111	Function = (OSD_EXECUTION_CALLBACK)atq->at->at_function;
112	Context = atq->at->at_context;
113
114	Function(Context);
115
116	free(atq->at, M_ACPITASK);
117	free(atq, M_ACPITASK);
118	ACPI_LOCK(taskq);
119    }
120
121    kthread_exit(0);
122}
123
124int
125acpi_task_thread_init(void)
126{
127    int		i, err;
128    struct proc	*acpi_kthread_proc;
129
130    err = 0;
131    STAILQ_INIT(&acpi_task_queue);
132
133    for (i = 0; i < ACPI_MAX_THREADS; i++) {
134	err = kthread_create(acpi_task_thread, NULL, &acpi_kthread_proc,
135			     0, 0, "acpi_task%d", i);
136	if (err != 0) {
137	    printf("%s: kthread_create failed(%d)\n", __func__, err);
138	    break;
139	}
140    }
141    return (err);
142}
143
144/* This function is called in interrupt context. */
145ACPI_STATUS
146AcpiOsQueueForExecution(UINT32 Priority, OSD_EXECUTION_CALLBACK Function,
147    void *Context)
148{
149    struct acpi_task	*at;
150    int pri;
151
152    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
153
154    if (Function == NULL)
155	return_ACPI_STATUS (AE_BAD_PARAMETER);
156
157    at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT | M_ZERO);
158    if (at == NULL)
159	return_ACPI_STATUS (AE_NO_MEMORY);
160
161    at->at_function = Function;
162    at->at_context = Context;
163    switch (Priority) {
164    case OSD_PRIORITY_GPE:
165	pri = 4;
166	break;
167    case OSD_PRIORITY_HIGH:
168	pri = 3;
169	break;
170    case OSD_PRIORITY_MED:
171	pri = 2;
172	break;
173    case OSD_PRIORITY_LO:
174	pri = 1;
175	break;
176    default:
177	free(at, M_ACPITASK);
178	return_ACPI_STATUS (AE_BAD_PARAMETER);
179    }
180    TASK_INIT(&at->at_task, pri, AcpiOsExecuteQueue, at);
181
182    taskqueue_enqueue(taskqueue_acpi, (struct task *)at);
183
184    return_ACPI_STATUS (AE_OK);
185}
186
187static void
188AcpiOsExecuteQueue(void *arg, int pending)
189{
190    struct acpi_task_queue	*atq;
191    OSD_EXECUTION_CALLBACK	Function;
192    void			*Context;
193
194    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
195
196    atq = NULL;
197    Function = NULL;
198    Context = NULL;
199
200    atq = malloc(sizeof(*atq), M_ACPITASK, M_NOWAIT);
201    if (atq == NULL) {
202	printf("%s: no memory\n", __func__);
203	return;
204    }
205    atq->at = (struct acpi_task *)arg;
206
207    ACPI_LOCK(taskq);
208    STAILQ_INSERT_TAIL(&acpi_task_queue, atq, at_q);
209    wakeup_one(&acpi_task_queue);
210    ACPI_UNLOCK(taskq);
211
212    return_VOID;
213}
214
215void
216AcpiOsSleep(UINT32 Seconds, UINT32 Milliseconds)
217{
218    int		timo;
219    static int	dummy;
220
221    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
222
223    timo = (Seconds * hz) + Milliseconds * hz / 1000;
224
225    /*
226     * If requested sleep time is less than our hz resolution, use
227     * DELAY instead for better granularity.
228     */
229    if (timo > 0)
230	tsleep(&dummy, 0, "acpislp", timo);
231    else
232	DELAY(Milliseconds * 1000);
233
234    return_VOID;
235}
236
237void
238AcpiOsStall(UINT32 Microseconds)
239{
240    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
241
242    DELAY(Microseconds);
243    return_VOID;
244}
245
246UINT32
247AcpiOsGetThreadId(void)
248{
249    struct proc *p;
250
251    /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
252
253    p = curproc;
254    KASSERT(p != NULL, ("%s: curproc is NULL!", __func__));
255
256    /* Returning 0 is not allowed. */
257    return (p->p_pid + 1);
258}
259