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:

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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/OsdSynch.c 105278 2002-10-16 17:23:34Z jhb $
28 */
29
30/*
31 * 6.1 : Mutual Exclusion and Synchronisation
32 */
33
34#include "acpi.h"
35
36#include "opt_acpi.h"
37#include <sys/kernel.h>
38#include <sys/malloc.h>
39#include <sys/sysctl.h>
40#if __FreeBSD_version >= 500000
41#include <sys/lock.h>
42#include <sys/mutex.h>
43#endif
44
45#define _COMPONENT ACPI_OS_SERVICES
46ACPI_MODULE_NAME("SYNCH")
47
48static MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
49
50#if __FreeBSD_version < 500000
51# define AS_LOCK(as) s = splhigh()
52# define AS_UNLOCK(as) splx(s)
53# define AS_LOCK_DECL int s
54# define msleep(a, b, c, d, e) tsleep(a, c, d, e)
55#else
56# define AS_LOCK(as) mtx_lock(&(as)->as_mtx)
57# define AS_UNLOCK(as) mtx_unlock(&(as)->as_mtx)
58# define AS_LOCK_DECL
59#endif
60
61/*
62 * Simple counting semaphore implemented using a mutex. (Subsequently used
63 * in the OSI code to implement a mutex. Go figure.)
64 */
65struct acpi_semaphore {
66#if __FreeBSD_version >= 500000
67 struct mtx as_mtx;
68#endif
69 UINT32 as_units;
70 UINT32 as_maxunits;
71 UINT32 as_pendings;
72 UINT32 as_resetting;
73 UINT32 as_timeouts;
74};
75
76#ifndef ACPI_NO_SEMAPHORES

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95 return(AE_BAD_PARAMETER);
96 if (InitialUnits > MaxUnits)
97 return_ACPI_STATUS(AE_BAD_PARAMETER);
98
99 if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT)) == NULL)
100 return_ACPI_STATUS(AE_NO_MEMORY);
101
102 bzero(as, sizeof(*as));
103#if __FreeBSD_version >= 500000
104 mtx_init(&as->as_mtx, "ACPI semaphore", NULL, MTX_DEF);
105#endif
106 as->as_units = InitialUnits;
107 as->as_maxunits = MaxUnits;
108 as->as_pendings = as->as_resetting = as->as_timeouts = 0;
109
110 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
111 "created semaphore %p max %d, initial %d\n",
112 as, InitialUnits, MaxUnits));
113

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123AcpiOsDeleteSemaphore (ACPI_HANDLE Handle)
124{
125#ifndef ACPI_NO_SEMAPHORES
126 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
127
128 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
129
130 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
131#if __FreeBSD_version >= 500000
132 mtx_destroy(&as->as_mtx);
133#endif
134 free(Handle, M_ACPISEM);
135 return_ACPI_STATUS(AE_OK);
136#else
137 return(AE_OK);
138#endif
139}
140
141/*

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146ACPI_STATUS
147AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT32 Timeout)
148{
149#ifndef ACPI_NO_SEMAPHORES
150 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
151 ACPI_STATUS result;
152 int rv, tmo;
153 struct timeval timeouttv, currenttv, timelefttv;
154 AS_LOCK_DECL;
155
156 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
157
158 if (as == NULL)
159 return_ACPI_STATUS(AE_BAD_PARAMETER);
160
161 if (cold)
162 return_ACPI_STATUS(AE_OK);
163
164#if 0
165 if (as->as_units < Units && as->as_timeouts > 10) {
166 printf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
167 AS_LOCK(as);
168 as->as_units = as->as_maxunits;
169 if (as->as_pendings)
170 as->as_resetting = 1;
171 as->as_timeouts = 0;
172 wakeup(as);
173 AS_UNLOCK(as);
174 return_ACPI_STATUS(AE_TIME);
175 }
176
177 if (as->as_resetting) {
178 return_ACPI_STATUS(AE_TIME);
179 }
180#endif
181

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192 timeouttv.tv_sec = Timeout / 1000;
193 timeouttv.tv_usec = (Timeout % 1000) * 1000;
194 }
195
196 /* calculate timeout value in timeval */
197 getmicrotime(&currenttv);
198 timevaladd(&timeouttv, &currenttv);
199
200 AS_LOCK(as);
201 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
202 "get %d units from semaphore %p (has %d), timeout %d\n",
203 Units, as, as->as_units, Timeout));
204 for (;;) {
205 if (as->as_maxunits == ACPI_NO_UNIT_LIMIT) {
206 result = AE_OK;
207 break;
208 }

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219 }
220
221 /* if timeout values of zero is specified, return immediately */
222 if (Timeout == 0) {
223 result = AE_TIME;
224 break;
225 }
226
227#if __FreeBSD_version >= 500000
228 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
229 "semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
230 as, &as->as_mtx, PCATCH, tmo));
231#endif
232
233 as->as_pendings++;
234
235 if (acpi_semaphore_debug) {
236 printf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
237 __func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
238 }
239

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291 }
292
293 if (result == AE_TIME) {
294 as->as_timeouts++;
295 } else {
296 as->as_timeouts = 0;
297 }
298
299 AS_UNLOCK(as);
300
301 return_ACPI_STATUS(result);
302#else
303 return(AE_OK);
304#endif
305}
306
307ACPI_STATUS
308AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
309{
310#ifndef ACPI_NO_SEMAPHORES
311 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
312 AS_LOCK_DECL;
313
314 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
315
316 if (as == NULL)
317 return_ACPI_STATUS(AE_BAD_PARAMETER);
318
319 AS_LOCK(as);
320 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
321 "return %d units to semaphore %p (has %d)\n",
322 Units, as, as->as_units));
323 if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
324 as->as_units += Units;
325 if (as->as_units > as->as_maxunits)
326 as->as_units = as->as_maxunits;
327 }
328
329 if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
330 printf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
331 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
332 }
333
334 wakeup(as);
335 AS_UNLOCK(as);
336 return_ACPI_STATUS(AE_OK);
337#else
338 return(AE_OK);
339#endif
340}