OsdSchedule.c revision 1.5 
1/*	$NetBSD: OsdSchedule.c,v 1.5 2007/12/21 18:42:38 jmcneill Exp $	*/
2
3/*
4 * Copyright 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed for the NetBSD Project by
20 *	Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 *    or promote products derived from this software without specific prior
23 *    written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * OS Services Layer
40 *
41 * 6.3: Scheduling services
42 */
43
44#include <sys/cdefs.h>
45__KERNEL_RCSID(0, "$NetBSD: OsdSchedule.c,v 1.5 2007/12/21 18:42:38 jmcneill Exp $");
46
47#include <sys/param.h>
48#include <sys/malloc.h>
49#include <sys/proc.h>
50#include <sys/systm.h>
51#include <sys/kernel.h>
52#include <sys/condvar.h>
53#include <sys/mutex.h>
54
55#include <dev/acpi/acpica.h>
56
57#include <dev/acpi/acpi_osd.h>
58
59#include <dev/sysmon/sysmon_taskq.h>
60
61#define	_COMPONENT	ACPI_OS_SERVICES
62ACPI_MODULE_NAME("SCHEDULE")
63
64static kcondvar_t	acpi_osd_sleep_cv;
65static kmutex_t		acpi_osd_sleep_mtx;
66
67/*
68 * acpi_osd_sched_init:
69 *
70 *	Initialize the APCICA Osd scheduler.  Called from AcpiOsInitialize().
71 */
72void
73acpi_osd_sched_init(void)
74{
75
76	ACPI_FUNCTION_TRACE(__func__);
77
78	sysmon_task_queue_init();
79	mutex_init(&acpi_osd_sleep_mtx, MUTEX_DEFAULT, IPL_NONE);
80	cv_init(&acpi_osd_sleep_cv, "acpislp");
81
82	return_VOID;
83}
84
85/*
86 * acpi_osd_sched_fini:
87 *
88 *	Clean up the ACPICA Osd scheduler.  Called from AcpiOsdTerminate().
89 */
90void
91acpi_osd_sched_fini(void)
92{
93
94	ACPI_FUNCTION_TRACE(__func__);
95
96	sysmon_task_queue_fini();
97
98	return_VOID;
99}
100
101/*
102 * AcpiOsGetThreadId:
103 *
104 *	Obtain the ID of the currently executing thread.
105 */
106ACPI_THREAD_ID
107AcpiOsGetThreadId(void)
108{
109
110	/* XXX ACPI CA can call this function in interrupt context */
111	if (curlwp == NULL)
112		return 1;
113
114	/* XXX Bleh, we're not allowed to return 0 (how stupid!) */
115	return (curlwp->l_proc->p_pid + 1);
116}
117
118/*
119 * AcpiOsQueueForExecution:
120 *
121 *	Schedule a procedure for deferred execution.
122 */
123ACPI_STATUS
124AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
125    void *Context)
126{
127	int pri;
128
129	ACPI_FUNCTION_TRACE(__func__);
130
131	switch (Type) {
132	case OSL_GPE_HANDLER:
133		pri = 10;
134		break;
135	case OSL_GLOBAL_LOCK_HANDLER:
136	case OSL_EC_POLL_HANDLER:
137	case OSL_EC_BURST_HANDLER:
138		pri = 5;
139		break;
140	case OSL_NOTIFY_HANDLER:
141		pri = 3;
142		break;
143	case OSL_DEBUGGER_THREAD:
144		pri = 0;
145		break;
146	default:
147		return_ACPI_STATUS(AE_BAD_PARAMETER);
148	}
149
150	switch (sysmon_task_queue_sched(pri, Function, Context)) {
151	case 0:
152		return_ACPI_STATUS(AE_OK);
153
154	case ENOMEM:
155		return_ACPI_STATUS(AE_NO_MEMORY);
156
157	default:
158		return_ACPI_STATUS(AE_BAD_PARAMETER);
159	}
160}
161
162/*
163 * AcpiOsSleep:
164 *
165 *	Suspend the running task (coarse granularity).
166 */
167void
168AcpiOsSleep(ACPI_INTEGER Milliseconds)
169{
170	ACPI_FUNCTION_TRACE(__func__);
171
172	mutex_enter(&acpi_osd_sleep_mtx);
173	cv_timedwait_sig(&acpi_osd_sleep_cv, &acpi_osd_sleep_mtx,
174	    MAX(mstohz(Milliseconds), 1));
175	mutex_exit(&acpi_osd_sleep_mtx);
176}
177
178/*
179 * AcpiOsStall:
180 *
181 *	Suspend the running task (fine granularity).
182 */
183void
184AcpiOsStall(UINT32 Microseconds)
185{
186
187	ACPI_FUNCTION_TRACE(__func__);
188
189	/*
190	 * sleep(9) isn't safe because AcpiOsStall may be called
191	 * with interrupt-disabled. (eg. by AcpiEnterSleepState)
192	 * we should watch out for long stall requests.
193	 */
194#ifdef ACPI_DEBUG
195	if (Microseconds > 1000)
196		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "long stall: %uus\n",
197		    Microseconds));
198#endif
199
200	delay(Microseconds);
201
202	return_VOID;
203
204}
205
206/*
207 * AcpiOsGetTimer:
208 *
209 *	Get the current system time in 100 nanosecond units
210 */
211UINT64
212AcpiOsGetTimer(void)
213{
214	struct timeval tv;
215	UINT64 t;
216
217	/* XXX During early boot there is no (decent) timer available yet. */
218	if (cold)
219		panic("acpi: timer op not yet supported during boot");
220
221	microtime(&tv);
222	t = (UINT64)10 * tv.tv_usec;
223	t += (UINT64)10000000 * tv.tv_sec;
224
225	return (t);
226}
227