2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
27 * $FreeBSD: src/sys/dev/acpica/Osd/OsdSynch.c,v 1.17.2.1 2003/08/22 20:49:21 jhb Exp $
28 * $DragonFly: src/sys/dev/acpica/Osd/Attic/OsdSynch.c,v 1.6 2005/06/09 20:47:37 swildner Exp $
32 * 6.1 : Mutual Exclusion and Synchronisation
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40 #include <sys/sysctl.h>
41 #include <sys/thread2.h>
42 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
44 #include <sys/mutex.h>
47 #define _COMPONENT ACPI_OS_SERVICES
48 ACPI_MODULE_NAME("SYNCH")
50 static MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
52 #if defined(__DragonFly__)
53 # define AS_LOCK(as) crit_enter()
54 # define AS_UNLOCK(as) crit_exit()
56 # define msleep(a, b, c, d, e) tsleep(a, c, d, e)
57 #elif __FreeBSD_version < 500000
58 # define AS_LOCK(as) s = splhigh()
59 # define AS_UNLOCK(as) splx(s)
60 # define AS_LOCK_DECL int s
61 # define msleep(a, b, c, d, e) tsleep(a, c, d, e)
63 # define AS_LOCK(as) mtx_lock(&(as)->as_mtx)
64 # define AS_UNLOCK(as) mtx_unlock(&(as)->as_mtx)
69 * Simple counting semaphore implemented using a mutex. (Subsequently used
70 * in the OSI code to implement a mutex. Go figure.)
72 struct acpi_semaphore {
73 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
83 #ifndef ACPI_NO_SEMAPHORES
84 #ifndef ACPI_SEMAPHORES_MAX_PENDING
85 #define ACPI_SEMAPHORES_MAX_PENDING 4
87 static int acpi_semaphore_debug = 0;
88 TUNABLE_INT("debug.acpi_semaphore_debug", &acpi_semaphore_debug);
89 SYSCTL_INT(_debug, OID_AUTO, acpi_semaphore_debug, CTLFLAG_RW,
90 &acpi_semaphore_debug, 0, "");
94 AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits, ACPI_HANDLE *OutHandle)
96 #ifndef ACPI_NO_SEMAPHORES
97 struct acpi_semaphore *as;
99 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
101 if (OutHandle == NULL)
102 return(AE_BAD_PARAMETER);
103 if (InitialUnits > MaxUnits)
104 return_ACPI_STATUS(AE_BAD_PARAMETER);
106 as = malloc(sizeof(*as), M_ACPISEM, M_INTWAIT | M_ZERO);
107 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
108 mtx_init(&as->as_mtx, "ACPI semaphore", NULL, MTX_DEF);
110 as->as_units = InitialUnits;
111 as->as_maxunits = MaxUnits;
112 as->as_pendings = as->as_resetting = as->as_timeouts = 0;
114 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
115 "created semaphore %p max %d, initial %d\n",
116 as, InitialUnits, MaxUnits));
118 *OutHandle = (ACPI_HANDLE)as;
119 return_ACPI_STATUS(AE_OK);
121 *OutHandle = (ACPI_HANDLE)OutHandle;
127 AcpiOsDeleteSemaphore (ACPI_HANDLE Handle)
129 #ifndef ACPI_NO_SEMAPHORES
130 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
131 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
134 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
136 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
137 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
138 mtx_destroy(&as->as_mtx);
140 free(Handle, M_ACPISEM);
141 return_ACPI_STATUS(AE_OK);
148 * This implementation has a bug, in that it has to stall for the entire
149 * timeout before it will return AE_TIME. A better implementation would
150 * use getmicrotime() to correctly adjust the timeout after being woken up.
153 AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT16 Timeout)
155 #ifndef ACPI_NO_SEMAPHORES
156 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
159 struct timeval timeouttv, currenttv, timelefttv;
162 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
165 return_ACPI_STATUS(AE_BAD_PARAMETER);
168 return_ACPI_STATUS(AE_OK);
171 if (as->as_units < Units && as->as_timeouts > 10) {
172 printf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
174 as->as_units = as->as_maxunits;
176 as->as_resetting = 1;
180 return_ACPI_STATUS(AE_TIME);
183 if (as->as_resetting) {
184 return_ACPI_STATUS(AE_TIME);
188 /* a timeout of ACPI_WAIT_FOREVER means "forever" */
189 if (Timeout == ACPI_WAIT_FOREVER) {
191 timeouttv.tv_sec = ((0xffff/1000) + 1); /* cf. ACPI spec */
192 timeouttv.tv_usec = 0;
194 /* compute timeout using microseconds per tick */
195 tmo = (Timeout * 1000) / (1000000 / hz);
198 timeouttv.tv_sec = Timeout / 1000;
199 timeouttv.tv_usec = (Timeout % 1000) * 1000;
202 /* calculate timeout value in timeval */
203 getmicrotime(¤ttv);
204 timevaladd(&timeouttv, ¤ttv);
207 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
208 "get %d units from semaphore %p (has %d), timeout %d\n",
209 Units, as, as->as_units, Timeout));
211 if (as->as_maxunits == ACPI_NO_UNIT_LIMIT) {
215 if (as->as_units >= Units) {
216 as->as_units -= Units;
221 /* limit number of pending treads */
222 if (as->as_pendings >= ACPI_SEMAPHORES_MAX_PENDING) {
227 /* if timeout values of zero is specified, return immediately */
233 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
234 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
235 "semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
236 as, &as->as_mtx, PCATCH, tmo));
241 if (acpi_semaphore_debug) {
242 printf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
243 __func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
246 rv = msleep(as, &as->as_mtx, PCATCH, "acsem", tmo);
251 if (as->as_resetting) {
252 /* semaphore reset, return immediately */
253 if (as->as_pendings == 0) {
254 as->as_resetting = 0;
261 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "msleep(%d) returned %d\n", tmo, rv));
262 if (rv == EWOULDBLOCK) {
267 /* check if we already awaited enough */
268 timelefttv = timeouttv;
269 getmicrotime(¤ttv);
270 timevalsub(&timelefttv, ¤ttv);
271 if (timelefttv.tv_sec < 0) {
272 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "await semaphore %p timeout\n", as));
277 /* adjust timeout for the next sleep */
278 tmo = (timelefttv.tv_sec * 1000000 + timelefttv.tv_usec) / (1000000 / hz);
282 if (acpi_semaphore_debug) {
283 printf("%s: Wakeup timeleft(%lu, %lu), tmo %u, semaphore %p, thread %d\n",
284 __func__, timelefttv.tv_sec, timelefttv.tv_usec, tmo, as, AcpiOsGetThreadId());
288 if (acpi_semaphore_debug) {
289 if (result == AE_TIME && Timeout > 0) {
290 printf("%s: Timeout %d, pending %d, semaphore %p\n",
291 __func__, Timeout, as->as_pendings, as);
293 if (result == AE_OK && (as->as_timeouts > 0 || as->as_pendings > 0)) {
294 printf("%s: Acquire %d, units %d, pending %d, semaphore %p, thread %d\n",
295 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
299 if (result == AE_TIME) {
307 return_ACPI_STATUS(result);
314 AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
316 #ifndef ACPI_NO_SEMAPHORES
317 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
320 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
323 return_ACPI_STATUS(AE_BAD_PARAMETER);
326 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
327 "return %d units to semaphore %p (has %d)\n",
328 Units, as, as->as_units));
329 if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
330 as->as_units += Units;
331 if (as->as_units > as->as_maxunits)
332 as->as_units = as->as_maxunits;
335 if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
336 printf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
337 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
342 return_ACPI_STATUS(AE_OK);