1 /*-
2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * Copyright (c) 2007-2009 Jung-uk Kim <jkim@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * 6.3 : Scheduling services
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/8.1/sys/dev/acpica/Osd/OsdSchedule.c 203544 2010-02-06 12:03:25Z avg $");
35
36 #include "opt_acpi.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/bus.h>
40 #include <sys/interrupt.h>
41 #include <sys/kernel.h>
42 #include <sys/kthread.h>
43 #include <sys/malloc.h>
44 #include <sys/proc.h>
45 #include <sys/taskqueue.h>
46
47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/accommon.h>
49
50 #include <dev/acpica/acpivar.h>
51
52 #define _COMPONENT ACPI_OS_SERVICES
53 ACPI_MODULE_NAME("SCHEDULE")
54
55 /*
56 * Allow the user to tune the maximum number of tasks we may enqueue.
57 */
58 static int acpi_max_tasks = ACPI_MAX_TASKS;
59 TUNABLE_INT("debug.acpi.max_tasks", &acpi_max_tasks);
60
61 /*
62 * Allow the user to tune the number of task threads we start. It seems
63 * some systems have problems with increased parallelism.
64 */
65 static int acpi_max_threads = ACPI_MAX_THREADS;
66 TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
67
68 MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
69
70 struct acpi_task_ctx {
71 struct task at_task;
72 ACPI_OSD_EXEC_CALLBACK at_function;
73 void *at_context;
74 int at_flag;
75 #define ACPI_TASK_FREE 0
76 #define ACPI_TASK_USED 1
77 #define ACPI_TASK_ENQUEUED 2
78 };
79
80 struct taskqueue *acpi_taskq;
81 static struct acpi_task_ctx *acpi_tasks;
82 static int acpi_task_count;
83 static int acpi_taskq_started;
84
85 /*
86 * Preallocate some memory for tasks early enough.
87 * malloc(9) cannot be used with spin lock held.
88 */
89 static void
90 acpi_task_init(void *arg)
91 {
92
93 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK,
94 M_WAITOK | M_ZERO);
95 }
96
97 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL);
98
99 /*
100 * Initialize ACPI task queue.
101 */
102 static void
103 acpi_taskq_init(void *arg)
104 {
105 int i;
106
107 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT,
108 &taskqueue_thread_enqueue, &acpi_taskq);
109 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task");
110 if (acpi_task_count > 0) {
111 if (bootverbose)
112 printf("AcpiOsExecute: enqueue %d pending tasks\n",
113 acpi_task_count);
114 for (i = 0; i < acpi_max_tasks; i++)
115 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED,
116 ACPI_TASK_USED | ACPI_TASK_ENQUEUED))
117 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task);
118 }
119 acpi_taskq_started = 1;
120 }
121
122 SYSINIT(acpi_taskq, SI_SUB_CONFIGURE, SI_ORDER_SECOND, acpi_taskq_init, NULL);
123
124 /*
125 * Bounce through this wrapper function since ACPI-CA doesn't understand
126 * the pending argument for its callbacks.
127 */
128 static void
129 acpi_task_execute(void *context, int pending)
130 {
131 struct acpi_task_ctx *at;
132
133 at = (struct acpi_task_ctx *)context;
134 at->at_function(at->at_context);
135 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED);
136 acpi_task_count--;
137 }
138
139 static ACPI_STATUS
140 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
141 {
142 struct acpi_task_ctx *at;
143 int i;
144
145 for (at = NULL, i = 0; i < acpi_max_tasks; i++)
146 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
147 ACPI_TASK_USED)) {
148 at = &acpi_tasks[i];
149 acpi_task_count++;
150 break;
151 }
152 if (at == NULL) {
153 printf("AcpiOsExecute: failed to enqueue task, consider increasing "
154 "the debug.acpi.max_tasks tunable\n");
155 return (AE_NO_MEMORY);
156 }
157
158 TASK_INIT(&at->at_task, priority, acpi_task_execute, at);
159 at->at_function = Function;
160 at->at_context = Context;
161
162 /*
163 * If the task queue is ready, enqueue it now.
164 */
165 if (acpi_taskq_started) {
166 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED);
167 taskqueue_enqueue(acpi_taskq, &at->at_task);
168 return (AE_OK);
169 }
170 if (bootverbose)
171 printf("AcpiOsExecute: task queue not started\n");
172
173 return (AE_OK);
174 }
175
176 /*
177 * This function may be called in interrupt context, i.e. when a GPE fires.
178 * We allocate and queue a task for one of our taskqueue threads to process.
179 */
180 ACPI_STATUS
181 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
182 void *Context)
183 {
184 int pri;
185
186 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
187
188 if (Function == NULL)
189 return_ACPI_STATUS (AE_BAD_PARAMETER);
190
191 switch (Type) {
192 case OSL_GPE_HANDLER:
193 case OSL_NOTIFY_HANDLER:
194 /*
195 * Run GPEs and Notifies at the same priority. This allows
196 * Notifies that are generated by running a GPE's method (e.g., _L00)
197 * to not be pre-empted by a later GPE that arrives during the
198 * Notify handler execution.
199 */
200 pri = 10;
201 break;
202 case OSL_GLOBAL_LOCK_HANDLER:
203 case OSL_EC_POLL_HANDLER:
204 case OSL_EC_BURST_HANDLER:
205 pri = 5;
206 break;
207 case OSL_DEBUGGER_THREAD:
208 pri = 0;
209 break;
210 default:
211 return_ACPI_STATUS (AE_BAD_PARAMETER);
212 }
213
214 return_ACPI_STATUS (acpi_task_enqueue(pri, Function, Context));
215 }
216
217 void
218 AcpiOsSleep(UINT64 Milliseconds)
219 {
220 int timo;
221
222 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
223
224 timo = Milliseconds * hz / 1000;
225
226 /*
227 * If requested sleep time is less than our hz resolution, use
228 * DELAY instead for better granularity.
229 */
230 if (timo > 0)
231 pause("acpislp", timo);
232 else
233 DELAY(Milliseconds * 1000);
234
235 return_VOID;
236 }
237
238 /*
239 * Return the current time in 100 nanosecond units
240 */
241 UINT64
242 AcpiOsGetTimer(void)
243 {
244 struct bintime bt;
245 UINT64 t;
246
247 /* XXX During early boot there is no (decent) timer available yet. */
248 if (cold)
249 panic("acpi: timer op not yet supported during boot");
250
251 binuptime(&bt);
252 t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
253 t += bt.sec * 10000000;
254
255 return (t);
256 }
257
258 void
259 AcpiOsStall(UINT32 Microseconds)
260 {
261 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
262
263 DELAY(Microseconds);
264 return_VOID;
265 }
266
267 ACPI_THREAD_ID
268 AcpiOsGetThreadId(void)
269 {
270
271 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
272
273 /* Returning 0 is not allowed. */
274 return (curthread->td_tid);
275 }
Cache object: 1c645e141f3fe02b4649f21456722235
|