2 * Copyright (c) 2000 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * Copyright (c) 2007-2009 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);
60 SYSCTL_INT(_debug_acpi, OID_AUTO, max_tasks, CTLFLAG_RDTUN, &acpi_max_tasks,
61 0, "Maximum acpi tasks");
64 * Allow the user to tune the number of task threads we start. It seems
65 * some systems have problems with increased parallelism.
67 static int acpi_max_threads = ACPI_MAX_THREADS;
68 TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
69 SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads,
70 0, "Maximum acpi threads");
72 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
74 struct acpi_task_ctx {
76 ACPI_OSD_EXEC_CALLBACK at_function;
79 #define ACPI_TASK_FREE 0
80 #define ACPI_TASK_USED 1
81 #define ACPI_TASK_ENQUEUED 2
84 struct taskqueue *acpi_taskq;
85 static struct acpi_task_ctx *acpi_tasks;
86 static int acpi_task_count;
87 static int acpi_taskq_started;
90 * Preallocate some memory for tasks early enough.
91 * malloc(9) cannot be used with spin lock held.
94 acpi_task_init(void *arg)
97 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK,
101 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL);
104 * Initialize ACPI task queue.
107 acpi_taskq_init(void *arg)
111 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT,
112 &taskqueue_thread_enqueue, &acpi_taskq);
113 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task");
114 if (acpi_task_count > 0) {
116 printf("AcpiOsExecute: enqueue %d pending tasks\n",
118 for (i = 0; i < acpi_max_tasks; i++)
119 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED,
120 ACPI_TASK_USED | ACPI_TASK_ENQUEUED))
121 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task);
123 acpi_taskq_started = 1;
126 SYSINIT(acpi_taskq, SI_SUB_CONFIGURE, SI_ORDER_SECOND, acpi_taskq_init, NULL);
129 * Bounce through this wrapper function since ACPI-CA doesn't understand
130 * the pending argument for its callbacks.
133 acpi_task_execute(void *context, int pending)
135 struct acpi_task_ctx *at;
137 at = (struct acpi_task_ctx *)context;
138 at->at_function(at->at_context);
139 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED);
144 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
146 struct acpi_task_ctx *at;
149 for (at = NULL, i = 0; i < acpi_max_tasks; i++)
150 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
157 printf("AcpiOsExecute: failed to enqueue task, consider increasing "
158 "the debug.acpi.max_tasks tunable\n");
159 return (AE_NO_MEMORY);
162 TASK_INIT(&at->at_task, priority, acpi_task_execute, at);
163 at->at_function = Function;
164 at->at_context = Context;
167 * If the task queue is ready, enqueue it now.
169 if (acpi_taskq_started) {
170 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED);
171 taskqueue_enqueue(acpi_taskq, &at->at_task);
175 printf("AcpiOsExecute: task queue not started\n");
181 * This function may be called in interrupt context, i.e. when a GPE fires.
182 * We allocate and queue a task for one of our taskqueue threads to process.
185 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
190 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
192 if (Function == NULL)
193 return_ACPI_STATUS (AE_BAD_PARAMETER);
196 case OSL_GPE_HANDLER:
197 case OSL_NOTIFY_HANDLER:
199 * Run GPEs and Notifies at the same priority. This allows
200 * Notifies that are generated by running a GPE's method (e.g., _L00)
201 * to not be pre-empted by a later GPE that arrives during the
202 * Notify handler execution.
206 case OSL_GLOBAL_LOCK_HANDLER:
207 case OSL_EC_POLL_HANDLER:
208 case OSL_EC_BURST_HANDLER:
211 case OSL_DEBUGGER_THREAD:
215 return_ACPI_STATUS (AE_BAD_PARAMETER);
218 return_ACPI_STATUS (acpi_task_enqueue(pri, Function, Context));
222 AcpiOsSleep(UINT64 Milliseconds)
226 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
228 timo = Milliseconds * hz / 1000;
231 * If requested sleep time is less than our hz resolution, use
232 * DELAY instead for better granularity.
235 pause("acpislp", timo);
237 DELAY(Milliseconds * 1000);
243 * Return the current time in 100 nanosecond units
251 /* XXX During early boot there is no (decent) timer available yet. */
252 KASSERT(cold == 0, ("acpi: timer op not yet supported during boot"));
255 t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
256 t += bt.sec * 10000000;
262 AcpiOsStall(UINT32 Microseconds)
264 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
271 AcpiOsGetThreadId(void)
274 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
276 /* Returning 0 is not allowed. */
277 return (curthread->td_tid);