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
28/*
29 * 6.1 : Mutual Exclusion and Synchronisation
30 */
31
32#include <sys/cdefs.h>
| 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
28/*
29 * 6.1 : Mutual Exclusion and Synchronisation
30 */
31
32#include <sys/cdefs.h>
|
34
35#include <contrib/dev/acpica/acpi.h>
36
37#include "opt_acpi.h"
38#include <sys/kernel.h>
39#include <sys/malloc.h>
40#include <sys/sysctl.h>
41#include <sys/lock.h>
42#include <sys/mutex.h>
43
44#define _COMPONENT ACPI_OS_SERVICES
45ACPI_MODULE_NAME("SYNCH")
46
47MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
48
49#define AS_LOCK(as) mtx_lock(&(as)->as_mtx)
50#define AS_UNLOCK(as) mtx_unlock(&(as)->as_mtx)
51
52/*
53 * Simple counting semaphore implemented using a mutex. (Subsequently used
54 * in the OSI code to implement a mutex. Go figure.)
55 */
56struct acpi_semaphore {
57 struct mtx as_mtx;
58 UINT32 as_units;
59 UINT32 as_maxunits;
60 UINT32 as_pendings;
61 UINT32 as_resetting;
62 UINT32 as_timeouts;
63};
64
65/* Default number of maximum pending threads. */
66#ifndef ACPI_NO_SEMAPHORES
67#ifndef ACPI_SEMAPHORES_MAX_PENDING
68#define ACPI_SEMAPHORES_MAX_PENDING 4
69#endif
70
71static int acpi_semaphore_debug = 0;
72TUNABLE_INT("debug.acpi_semaphore_debug", &acpi_semaphore_debug);
73SYSCTL_DECL(_debug_acpi);
74SYSCTL_INT(_debug_acpi, OID_AUTO, semaphore_debug, CTLFLAG_RW,
75 &acpi_semaphore_debug, 0, "Enable ACPI semaphore debug messages");
76#endif /* !ACPI_NO_SEMAPHORES */
77
78ACPI_STATUS
79AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits,
80 ACPI_HANDLE *OutHandle)
81{
82#ifndef ACPI_NO_SEMAPHORES
83 struct acpi_semaphore *as;
84
85 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
86
87 if (OutHandle == NULL)
88 return_ACPI_STATUS (AE_BAD_PARAMETER);
89 if (InitialUnits > MaxUnits)
90 return_ACPI_STATUS (AE_BAD_PARAMETER);
91
92 if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT | M_ZERO)) == NULL)
93 return_ACPI_STATUS (AE_NO_MEMORY);
94
95 mtx_init(&as->as_mtx, "ACPI semaphore", NULL, MTX_DEF);
96 as->as_units = InitialUnits;
97 as->as_maxunits = MaxUnits;
98 as->as_pendings = as->as_resetting = as->as_timeouts = 0;
99
100 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
101 "created semaphore %p max %d, initial %d\n",
102 as, InitialUnits, MaxUnits));
103
104 *OutHandle = (ACPI_HANDLE)as;
105#else
106 *OutHandle = (ACPI_HANDLE)OutHandle;
107#endif /* !ACPI_NO_SEMAPHORES */
108
109 return_ACPI_STATUS (AE_OK);
110}
111
112ACPI_STATUS
113AcpiOsDeleteSemaphore(ACPI_HANDLE Handle)
114{
115#ifndef ACPI_NO_SEMAPHORES
116 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
117
118 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
119
120 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
121 mtx_destroy(&as->as_mtx);
122 free(Handle, M_ACPISEM);
123#endif /* !ACPI_NO_SEMAPHORES */
124
125 return_ACPI_STATUS (AE_OK);
126}
127
128/*
129 * This implementation has a bug, in that it has to stall for the entire
130 * timeout before it will return AE_TIME. A better implementation would
131 * use getmicrotime() to correctly adjust the timeout after being woken up.
132 */
133ACPI_STATUS
134AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT16 Timeout)
135{
136#ifndef ACPI_NO_SEMAPHORES
137 ACPI_STATUS result;
138 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
139 int rv, tmo;
140 struct timeval timeouttv, currenttv, timelefttv;
141
142 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
143
144 if (as == NULL)
145 return_ACPI_STATUS (AE_BAD_PARAMETER);
146
147 if (cold)
148 return_ACPI_STATUS (AE_OK);
149
150#if 0
151 if (as->as_units < Units && as->as_timeouts > 10) {
152 printf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
153 AS_LOCK(as);
154 as->as_units = as->as_maxunits;
155 if (as->as_pendings)
156 as->as_resetting = 1;
157 as->as_timeouts = 0;
158 wakeup(as);
159 AS_UNLOCK(as);
160 return_ACPI_STATUS (AE_TIME);
161 }
162
163 if (as->as_resetting)
164 return_ACPI_STATUS (AE_TIME);
165#endif
166
167 /* a timeout of ACPI_WAIT_FOREVER means "forever" */
168 if (Timeout == ACPI_WAIT_FOREVER) {
169 tmo = 0;
170 timeouttv.tv_sec = ((0xffff/1000) + 1); /* cf. ACPI spec */
171 timeouttv.tv_usec = 0;
172 } else {
173 /* compute timeout using microseconds per tick */
174 tmo = (Timeout * 1000) / (1000000 / hz);
175 if (tmo <= 0)
176 tmo = 1;
177 timeouttv.tv_sec = Timeout / 1000;
178 timeouttv.tv_usec = (Timeout % 1000) * 1000;
179 }
180
181 /* calculate timeout value in timeval */
182 getmicrotime(¤ttv);
183 timevaladd(&timeouttv, ¤ttv);
184
185 AS_LOCK(as);
186 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
187 "get %d units from semaphore %p (has %d), timeout %d\n",
188 Units, as, as->as_units, Timeout));
189 for (;;) {
190 if (as->as_maxunits == ACPI_NO_UNIT_LIMIT) {
191 result = AE_OK;
192 break;
193 }
194 if (as->as_units >= Units) {
195 as->as_units -= Units;
196 result = AE_OK;
197 break;
198 }
199
200 /* limit number of pending threads */
201 if (as->as_pendings >= ACPI_SEMAPHORES_MAX_PENDING) {
202 result = AE_TIME;
203 break;
204 }
205
206 /* if timeout values of zero is specified, return immediately */
207 if (Timeout == 0) {
208 result = AE_TIME;
209 break;
210 }
211
212 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
213 "semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
214 as, &as->as_mtx, PCATCH, tmo));
215
216 as->as_pendings++;
217
218 if (acpi_semaphore_debug) {
219 printf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
220 __func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
221 }
222
223 rv = msleep(as, &as->as_mtx, PCATCH, "acsem", tmo);
224
225 as->as_pendings--;
226
227#if 0
228 if (as->as_resetting) {
229 /* semaphore reset, return immediately */
230 if (as->as_pendings == 0) {
231 as->as_resetting = 0;
232 }
233 result = AE_TIME;
234 break;
235 }
236#endif
237
238 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "msleep(%d) returned %d\n", tmo, rv));
239 if (rv == EWOULDBLOCK) {
240 result = AE_TIME;
241 break;
242 }
243
244 /* check if we already awaited enough */
245 timelefttv = timeouttv;
246 getmicrotime(¤ttv);
247 timevalsub(&timelefttv, ¤ttv);
248 if (timelefttv.tv_sec < 0) {
249 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "await semaphore %p timeout\n",
250 as));
251 result = AE_TIME;
252 break;
253 }
254
255 /* adjust timeout for the next sleep */
256 tmo = (timelefttv.tv_sec * 1000000 + timelefttv.tv_usec) /
257 (1000000 / hz);
258 if (tmo <= 0)
259 tmo = 1;
260
261 if (acpi_semaphore_debug) {
262 printf("%s: Wakeup timeleft(%jd, %lu), tmo %u, sem %p, thread %d\n",
263 __func__, (intmax_t)timelefttv.tv_sec, timelefttv.tv_usec, tmo, as,
264 AcpiOsGetThreadId());
265 }
266 }
267
268 if (acpi_semaphore_debug) {
269 if (result == AE_TIME && Timeout > 0) {
270 printf("%s: Timeout %d, pending %d, semaphore %p\n",
271 __func__, Timeout, as->as_pendings, as);
272 }
273 if (result == AE_OK && (as->as_timeouts > 0 || as->as_pendings > 0)) {
274 printf("%s: Acquire %d, units %d, pending %d, sem %p, thread %d\n",
275 __func__, Units, as->as_units, as->as_pendings, as,
276 AcpiOsGetThreadId());
277 }
278 }
279
280 if (result == AE_TIME)
281 as->as_timeouts++;
282 else
283 as->as_timeouts = 0;
284
285 AS_UNLOCK(as);
286 return_ACPI_STATUS (result);
287#else
288 return_ACPI_STATUS (AE_OK);
289#endif /* !ACPI_NO_SEMAPHORES */
290}
291
292ACPI_STATUS
293AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
294{
295#ifndef ACPI_NO_SEMAPHORES
296 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
297
298 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
299
300 if (as == NULL)
301 return_ACPI_STATUS(AE_BAD_PARAMETER);
302
303 AS_LOCK(as);
304 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
305 "return %d units to semaphore %p (has %d)\n",
306 Units, as, as->as_units));
307 if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
308 as->as_units += Units;
309 if (as->as_units > as->as_maxunits)
310 as->as_units = as->as_maxunits;
311 }
312
313 if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
314 printf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
315 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
316 }
317
318 wakeup(as);
319 AS_UNLOCK(as);
320#endif /* !ACPI_NO_SEMAPHORES */
321
322 return_ACPI_STATUS (AE_OK);
323}
324
| 34
35#include <contrib/dev/acpica/acpi.h>
36
37#include "opt_acpi.h"
38#include <sys/kernel.h>
39#include <sys/malloc.h>
40#include <sys/sysctl.h>
41#include <sys/lock.h>
42#include <sys/mutex.h>
43
44#define _COMPONENT ACPI_OS_SERVICES
45ACPI_MODULE_NAME("SYNCH")
46
47MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
48
49#define AS_LOCK(as) mtx_lock(&(as)->as_mtx)
50#define AS_UNLOCK(as) mtx_unlock(&(as)->as_mtx)
51
52/*
53 * Simple counting semaphore implemented using a mutex. (Subsequently used
54 * in the OSI code to implement a mutex. Go figure.)
55 */
56struct acpi_semaphore {
57 struct mtx as_mtx;
58 UINT32 as_units;
59 UINT32 as_maxunits;
60 UINT32 as_pendings;
61 UINT32 as_resetting;
62 UINT32 as_timeouts;
63};
64
65/* Default number of maximum pending threads. */
66#ifndef ACPI_NO_SEMAPHORES
67#ifndef ACPI_SEMAPHORES_MAX_PENDING
68#define ACPI_SEMAPHORES_MAX_PENDING 4
69#endif
70
71static int acpi_semaphore_debug = 0;
72TUNABLE_INT("debug.acpi_semaphore_debug", &acpi_semaphore_debug);
73SYSCTL_DECL(_debug_acpi);
74SYSCTL_INT(_debug_acpi, OID_AUTO, semaphore_debug, CTLFLAG_RW,
75 &acpi_semaphore_debug, 0, "Enable ACPI semaphore debug messages");
76#endif /* !ACPI_NO_SEMAPHORES */
77
78ACPI_STATUS
79AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits,
80 ACPI_HANDLE *OutHandle)
81{
82#ifndef ACPI_NO_SEMAPHORES
83 struct acpi_semaphore *as;
84
85 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
86
87 if (OutHandle == NULL)
88 return_ACPI_STATUS (AE_BAD_PARAMETER);
89 if (InitialUnits > MaxUnits)
90 return_ACPI_STATUS (AE_BAD_PARAMETER);
91
92 if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT | M_ZERO)) == NULL)
93 return_ACPI_STATUS (AE_NO_MEMORY);
94
95 mtx_init(&as->as_mtx, "ACPI semaphore", NULL, MTX_DEF);
96 as->as_units = InitialUnits;
97 as->as_maxunits = MaxUnits;
98 as->as_pendings = as->as_resetting = as->as_timeouts = 0;
99
100 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
101 "created semaphore %p max %d, initial %d\n",
102 as, InitialUnits, MaxUnits));
103
104 *OutHandle = (ACPI_HANDLE)as;
105#else
106 *OutHandle = (ACPI_HANDLE)OutHandle;
107#endif /* !ACPI_NO_SEMAPHORES */
108
109 return_ACPI_STATUS (AE_OK);
110}
111
112ACPI_STATUS
113AcpiOsDeleteSemaphore(ACPI_HANDLE Handle)
114{
115#ifndef ACPI_NO_SEMAPHORES
116 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
117
118 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
119
120 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "destroyed semaphore %p\n", as));
121 mtx_destroy(&as->as_mtx);
122 free(Handle, M_ACPISEM);
123#endif /* !ACPI_NO_SEMAPHORES */
124
125 return_ACPI_STATUS (AE_OK);
126}
127
128/*
129 * This implementation has a bug, in that it has to stall for the entire
130 * timeout before it will return AE_TIME. A better implementation would
131 * use getmicrotime() to correctly adjust the timeout after being woken up.
132 */
133ACPI_STATUS
134AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT16 Timeout)
135{
136#ifndef ACPI_NO_SEMAPHORES
137 ACPI_STATUS result;
138 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
139 int rv, tmo;
140 struct timeval timeouttv, currenttv, timelefttv;
141
142 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
143
144 if (as == NULL)
145 return_ACPI_STATUS (AE_BAD_PARAMETER);
146
147 if (cold)
148 return_ACPI_STATUS (AE_OK);
149
150#if 0
151 if (as->as_units < Units && as->as_timeouts > 10) {
152 printf("%s: semaphore %p too many timeouts, resetting\n", __func__, as);
153 AS_LOCK(as);
154 as->as_units = as->as_maxunits;
155 if (as->as_pendings)
156 as->as_resetting = 1;
157 as->as_timeouts = 0;
158 wakeup(as);
159 AS_UNLOCK(as);
160 return_ACPI_STATUS (AE_TIME);
161 }
162
163 if (as->as_resetting)
164 return_ACPI_STATUS (AE_TIME);
165#endif
166
167 /* a timeout of ACPI_WAIT_FOREVER means "forever" */
168 if (Timeout == ACPI_WAIT_FOREVER) {
169 tmo = 0;
170 timeouttv.tv_sec = ((0xffff/1000) + 1); /* cf. ACPI spec */
171 timeouttv.tv_usec = 0;
172 } else {
173 /* compute timeout using microseconds per tick */
174 tmo = (Timeout * 1000) / (1000000 / hz);
175 if (tmo <= 0)
176 tmo = 1;
177 timeouttv.tv_sec = Timeout / 1000;
178 timeouttv.tv_usec = (Timeout % 1000) * 1000;
179 }
180
181 /* calculate timeout value in timeval */
182 getmicrotime(¤ttv);
183 timevaladd(&timeouttv, ¤ttv);
184
185 AS_LOCK(as);
186 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
187 "get %d units from semaphore %p (has %d), timeout %d\n",
188 Units, as, as->as_units, Timeout));
189 for (;;) {
190 if (as->as_maxunits == ACPI_NO_UNIT_LIMIT) {
191 result = AE_OK;
192 break;
193 }
194 if (as->as_units >= Units) {
195 as->as_units -= Units;
196 result = AE_OK;
197 break;
198 }
199
200 /* limit number of pending threads */
201 if (as->as_pendings >= ACPI_SEMAPHORES_MAX_PENDING) {
202 result = AE_TIME;
203 break;
204 }
205
206 /* if timeout values of zero is specified, return immediately */
207 if (Timeout == 0) {
208 result = AE_TIME;
209 break;
210 }
211
212 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
213 "semaphore blocked, calling msleep(%p, %p, %d, \"acsem\", %d)\n",
214 as, &as->as_mtx, PCATCH, tmo));
215
216 as->as_pendings++;
217
218 if (acpi_semaphore_debug) {
219 printf("%s: Sleep %d, pending %d, semaphore %p, thread %d\n",
220 __func__, Timeout, as->as_pendings, as, AcpiOsGetThreadId());
221 }
222
223 rv = msleep(as, &as->as_mtx, PCATCH, "acsem", tmo);
224
225 as->as_pendings--;
226
227#if 0
228 if (as->as_resetting) {
229 /* semaphore reset, return immediately */
230 if (as->as_pendings == 0) {
231 as->as_resetting = 0;
232 }
233 result = AE_TIME;
234 break;
235 }
236#endif
237
238 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "msleep(%d) returned %d\n", tmo, rv));
239 if (rv == EWOULDBLOCK) {
240 result = AE_TIME;
241 break;
242 }
243
244 /* check if we already awaited enough */
245 timelefttv = timeouttv;
246 getmicrotime(¤ttv);
247 timevalsub(&timelefttv, ¤ttv);
248 if (timelefttv.tv_sec < 0) {
249 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "await semaphore %p timeout\n",
250 as));
251 result = AE_TIME;
252 break;
253 }
254
255 /* adjust timeout for the next sleep */
256 tmo = (timelefttv.tv_sec * 1000000 + timelefttv.tv_usec) /
257 (1000000 / hz);
258 if (tmo <= 0)
259 tmo = 1;
260
261 if (acpi_semaphore_debug) {
262 printf("%s: Wakeup timeleft(%jd, %lu), tmo %u, sem %p, thread %d\n",
263 __func__, (intmax_t)timelefttv.tv_sec, timelefttv.tv_usec, tmo, as,
264 AcpiOsGetThreadId());
265 }
266 }
267
268 if (acpi_semaphore_debug) {
269 if (result == AE_TIME && Timeout > 0) {
270 printf("%s: Timeout %d, pending %d, semaphore %p\n",
271 __func__, Timeout, as->as_pendings, as);
272 }
273 if (result == AE_OK && (as->as_timeouts > 0 || as->as_pendings > 0)) {
274 printf("%s: Acquire %d, units %d, pending %d, sem %p, thread %d\n",
275 __func__, Units, as->as_units, as->as_pendings, as,
276 AcpiOsGetThreadId());
277 }
278 }
279
280 if (result == AE_TIME)
281 as->as_timeouts++;
282 else
283 as->as_timeouts = 0;
284
285 AS_UNLOCK(as);
286 return_ACPI_STATUS (result);
287#else
288 return_ACPI_STATUS (AE_OK);
289#endif /* !ACPI_NO_SEMAPHORES */
290}
291
292ACPI_STATUS
293AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
294{
295#ifndef ACPI_NO_SEMAPHORES
296 struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
297
298 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
299
300 if (as == NULL)
301 return_ACPI_STATUS(AE_BAD_PARAMETER);
302
303 AS_LOCK(as);
304 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
305 "return %d units to semaphore %p (has %d)\n",
306 Units, as, as->as_units));
307 if (as->as_maxunits != ACPI_NO_UNIT_LIMIT) {
308 as->as_units += Units;
309 if (as->as_units > as->as_maxunits)
310 as->as_units = as->as_maxunits;
311 }
312
313 if (acpi_semaphore_debug && (as->as_timeouts > 0 || as->as_pendings > 0)) {
314 printf("%s: Release %d, units %d, pending %d, semaphore %p, thread %d\n",
315 __func__, Units, as->as_units, as->as_pendings, as, AcpiOsGetThreadId());
316 }
317
318 wakeup(as);
319 AS_UNLOCK(as);
320#endif /* !ACPI_NO_SEMAPHORES */
321
322 return_ACPI_STATUS (AE_OK);
323}
324
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