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 1.18 2003/09/26 21:22:10 njl Exp $
28 * $DragonFly: src/sys/dev/acpica5/Osd/OsdSynch.c,v 1.1 2004/02/21 06:48:09 dillon 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/thread.h>
42 #include <sys/thread2.h>
44 #define _COMPONENT ACPI_OS_SERVICES
45 ACPI_MODULE_NAME("SYNCH")
47 static MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
49 #if defined(__DragonFly__)
50 # define AS_LOCK(as) s = splhigh()
51 # define AS_UNLOCK(as) splx(s)
52 # define AS_LOCK_DECL int s
53 # define msleep(a, b, c, d, e) tsleep(a, c, d, e)
54 #elif __FreeBSD_version < 500000
55 # define AS_LOCK(as) s = splhigh()
56 # define AS_UNLOCK(as) splx(s)
57 # define AS_LOCK_DECL int s
58 # define msleep(a, b, c, d, e) tsleep(a, c, d, e)
60 # define AS_LOCK(as) mtx_lock(&(as)->as_mtx)
61 # define AS_UNLOCK(as) mtx_unlock(&(as)->as_mtx)
66 * Simple counting semaphore implemented using a mutex. (Subsequently used
67 * in the OSI code to implement a mutex. Go figure.)
69 struct acpi_semaphore {
70 #if __FreeBSD_version >= 500000
80 #ifndef ACPI_NO_SEMAPHORES
81 #ifndef ACPI_SEMAPHORES_MAX_PENDING
82 #define ACPI_SEMAPHORES_MAX_PENDING 4
84 static int acpi_semaphore_debug = 0;
85 TUNABLE_INT("debug.acpi_semaphore_debug", &acpi_semaphore_debug);
86 SYSCTL_DECL(_debug_acpi);
87 SYSCTL_INT(_debug_acpi, OID_AUTO, semaphore_debug, CTLFLAG_RW,
88 &acpi_semaphore_debug, 0, "Enable ACPI semaphore debug messages");
92 AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits, ACPI_HANDLE *OutHandle)
94 #ifndef ACPI_NO_SEMAPHORES
95 struct acpi_semaphore *as;
97 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
99 if (OutHandle == NULL)
100 return(AE_BAD_PARAMETER);
101 if (InitialUnits > MaxUnits)
102 return_ACPI_STATUS(AE_BAD_PARAMETER);
104 if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT)) == NULL)
105 return_ACPI_STATUS(AE_NO_MEMORY);
107 bzero(as, sizeof(*as));
108 #if __FreeBSD_version >= 500000
109 mtx_init(&as->as_mtx, "ACPI semaphore", NULL, MTX_DEF);
111 as->as_units = InitialUnits;
112 as->as_maxunits = MaxUnits;
113 as->as_pendings = as->as_resetting = as->as_timeouts = 0;
115 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
116 "created semaphore %p max %d, initial %d\n",
117 as, InitialUnits, MaxUnits));
119 *OutHandle = (ACPI_HANDLE)as;
120 return_ACPI_STATUS(AE_OK);
122 *OutHandle = (ACPI_HANDLE)OutHandle;
128 AcpiOsDeleteSemaphore (ACPI_HANDLE Handle)
130 #ifndef ACPI_NO_SEMAPHORES
131 #if __FreeBSD_version >= 500000
132 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
135 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
137 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
138 #if __FreeBSD_version >= 500000
139 mtx_destroy(&as->as_mtx);
141 free(Handle, M_ACPISEM);
142 return_ACPI_STATUS(AE_OK);
149 * This implementation has a bug, in that it has to stall for the entire
150 * timeout before it will return AE_TIME. A better implementation would
151 * use getmicrotime() to correctly adjust the timeout after being woken up.
154 AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT16 Timeout)
156 #ifndef ACPI_NO_SEMAPHORES
157 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
160 struct timeval timeouttv, currenttv, timelefttv;
163 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
166 return_ACPI_STATUS(AE_BAD_PARAMETER);
169 return_ACPI_STATUS(AE_OK);
172 if (as->as_units < Units && as->as_timeouts > 10) {
173 printf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
175 as->as_units = as->as_maxunits;
177 as->as_resetting = 1;
181 return_ACPI_STATUS(AE_TIME);
184 if (as->as_resetting) {
185 return_ACPI_STATUS(AE_TIME);
189 /* a timeout of ACPI_WAIT_FOREVER means "forever" */
190 if (Timeout == ACPI_WAIT_FOREVER) {
192 timeouttv.tv_sec = ((0xffff/1000) + 1); /* cf. ACPI spec */
193 timeouttv.tv_usec = 0;
195 /* compute timeout using microseconds per tick */
196 tmo = (Timeout * 1000) / (1000000 / hz);
199 timeouttv.tv_sec = Timeout / 1000;
200 timeouttv.tv_usec = (Timeout % 1000) * 1000;
203 /* calculate timeout value in timeval */
204 getmicrotime(¤ttv);
205 timevaladd(&timeouttv, ¤ttv);
208 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
209 "get %d units from semaphore %p (has %d), timeout %d\n",
210 Units, as, as->as_units, Timeout));
212 if (as->as_maxunits == ACPI_NO_UNIT_LIMIT) {
216 if (as->as_units >= Units) {
217 as->as_units -= Units;
222 /* limit number of pending treads */
223 if (as->as_pendings >= ACPI_SEMAPHORES_MAX_PENDING) {
228 /* if timeout values of zero is specified, return immediately */
234 #if __FreeBSD_version >= 500000
235 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
236 "semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
237 as, &as->as_mtx, PCATCH, tmo));
242 if (acpi_semaphore_debug) {
243 printf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
244 __func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
247 rv = msleep(as, &as->as_mtx, PCATCH, "acsem", tmo);
252 if (as->as_resetting) {
253 /* semaphore reset, return immediately */
254 if (as->as_pendings == 0) {
255 as->as_resetting = 0;
262 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "msleep(%d) returned %d\n", tmo, rv));
263 if (rv == EWOULDBLOCK) {
268 /* check if we already awaited enough */
269 timelefttv = timeouttv;
270 getmicrotime(¤ttv);
271 timevalsub(&timelefttv, ¤ttv);
272 if (timelefttv.tv_sec < 0) {
273 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "await semaphore %p timeout\n", as));
278 /* adjust timeout for the next sleep */
279 tmo = (timelefttv.tv_sec * 1000000 + timelefttv.tv_usec) / (1000000 / hz);
283 if (acpi_semaphore_debug) {
284 printf("%s: Wakeup timeleft(%lu, %lu), tmo %u, semaphore %p, thread %d\n",
285 __func__, timelefttv.tv_sec, timelefttv.tv_usec, tmo, as, AcpiOsGetThreadId());
289 if (acpi_semaphore_debug) {
290 if (result == AE_TIME && Timeout > 0) {
291 printf("%s: Timeout %d, pending %d, semaphore %p\n",
292 __func__, Timeout, as->as_pendings, as);
294 if (result == AE_OK && (as->as_timeouts > 0 || as->as_pendings > 0)) {
295 printf("%s: Acquire %d, units %d, pending %d, semaphore %p, thread %d\n",
296 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
300 if (result == AE_TIME) {
308 return_ACPI_STATUS(result);
315 AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
317 #ifndef ACPI_NO_SEMAPHORES
318 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
321 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
324 return_ACPI_STATUS(AE_BAD_PARAMETER);
327 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
328 "return %d units to semaphore %p (has %d)\n",
329 Units, as, as->as_units));
330 if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
331 as->as_units += Units;
332 if (as->as_units > as->as_maxunits)
333 as->as_units = as->as_maxunits;
336 if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
337 printf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
338 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
343 return_ACPI_STATUS(AE_OK);
350 AcpiOsCreateLock (ACPI_HANDLE *OutHandle)
354 if (OutHandle == NULL)
355 return (AE_BAD_PARAMETER);
356 MALLOC(tok, lwkt_token_t, sizeof(*tok), M_ACPISEM, M_WAITOK | M_ZERO);
358 return (AE_NO_MEMORY);
361 *OutHandle = (ACPI_HANDLE)tok;
366 AcpiOsDeleteLock (ACPI_HANDLE Handle)
369 lwkt_token_t tok = (lwkt_token_t)Handle;
378 * The Flags parameter seems to state whether or not caller is an ISR
379 * (and thus can't block) but since we have ithreads, we don't worry
380 * about potentially blocking.
383 AcpiOsAcquireLock (ACPI_HANDLE Handle, UINT32 Flags)
385 lwkt_token_t tok = (lwkt_token_t)Handle;
393 AcpiOsReleaseLock (ACPI_HANDLE Handle, UINT32 Flags)
395 lwkt_token_t tok = (lwkt_token_t)Handle;