2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * Copyright (c) 2007-2012 Jung-uk Kim <jkim@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
30 * 6.3 : Scheduling services
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/interrupt.h>
41 #include <sys/kernel.h>
42 #include <sys/kthread.h>
43 #include <sys/malloc.h>
45 #include <sys/taskqueue.h>
47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/accommon.h>
50 #include <dev/acpica/acpivar.h>
52 #define _COMPONENT ACPI_OS_SERVICES
53 ACPI_MODULE_NAME("SCHEDULE")
56 * Allow the user to tune the maximum number of tasks we may enqueue.
58 static int acpi_max_tasks = ACPI_MAX_TASKS;
59 TUNABLE_INT("debug.acpi.max_tasks", &acpi_max_tasks);
62 * Allow the user to tune the number of task threads we start. It seems
63 * some systems have problems with increased parallelism.
65 static int acpi_max_threads = ACPI_MAX_THREADS;
66 TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
68 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
70 struct acpi_task_ctx {
72 ACPI_OSD_EXEC_CALLBACK at_function;
75 #define ACPI_TASK_FREE 0
76 #define ACPI_TASK_USED 1
77 #define ACPI_TASK_ENQUEUED 2
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;
86 * Preallocate some memory for tasks early enough.
87 * malloc(9) cannot be used with spin lock held.
90 acpi_task_init(void *arg)
93 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK,
97 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL);
100 * Initialize ACPI task queue.
103 acpi_taskq_init(void *arg)
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) {
112 printf("AcpiOsExecute: enqueue %d pending tasks\n",
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);
119 acpi_taskq_started = 1;
122 SYSINIT(acpi_taskq, SI_SUB_CONFIGURE, SI_ORDER_SECOND, acpi_taskq_init, NULL);
125 * Bounce through this wrapper function since ACPI-CA doesn't understand
126 * the pending argument for its callbacks.
129 acpi_task_execute(void *context, int pending)
131 struct acpi_task_ctx *at;
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);
140 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
142 struct acpi_task_ctx *at;
145 for (at = NULL, i = 0; i < acpi_max_tasks; i++)
146 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
153 printf("AcpiOsExecute: failed to enqueue task, consider increasing "
154 "the debug.acpi.max_tasks tunable\n");
155 return (AE_NO_MEMORY);
158 TASK_INIT(&at->at_task, priority, acpi_task_execute, at);
159 at->at_function = Function;
160 at->at_context = Context;
163 * If the task queue is ready, enqueue it now.
165 if (acpi_taskq_started) {
166 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED);
167 taskqueue_enqueue(acpi_taskq, &at->at_task);
171 printf("AcpiOsExecute: task queue not started\n");
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.
181 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
187 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
189 if (Function == NULL)
190 return_ACPI_STATUS(AE_BAD_PARAMETER);
193 case OSL_GPE_HANDLER:
194 case OSL_NOTIFY_HANDLER:
196 * Run GPEs and Notifies at the same priority. This allows
197 * Notifies that are generated by running a GPE's method (e.g., _L00)
198 * to not be pre-empted by a later GPE that arrives during the
199 * Notify handler execution.
203 case OSL_GLOBAL_LOCK_HANDLER:
204 case OSL_EC_POLL_HANDLER:
205 case OSL_EC_BURST_HANDLER:
208 case OSL_DEBUGGER_THREAD:
212 return_ACPI_STATUS(AE_BAD_PARAMETER);
215 status = acpi_task_enqueue(pri, Function, Context);
216 return_ACPI_STATUS(status);
220 AcpiOsWaitEventsComplete(void)
224 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
226 for (i = 0; i < acpi_max_tasks; i++)
227 if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) &
228 ACPI_TASK_ENQUEUED) != 0)
229 taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task);
234 AcpiOsSleep(UINT64 Milliseconds)
238 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
240 timo = Milliseconds * hz / 1000;
243 * If requested sleep time is less than our hz resolution, use
244 * DELAY instead for better granularity.
247 pause("acpislp", timo);
249 DELAY(Milliseconds * 1000);
255 * Return the current time in 100 nanosecond units
263 /* XXX During early boot there is no (decent) timer available yet. */
264 KASSERT(cold == 0, ("acpi: timer op not yet supported during boot"));
267 t = (uint64_t)bt.sec * 10000000;
268 t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
274 AcpiOsStall(UINT32 Microseconds)
276 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
283 AcpiOsGetThreadId(void)
286 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
288 /* Returning 0 is not allowed. */
289 return (curthread->td_tid);