/*- * Copyright (c) 2000 Michael Smith * Copyright (c) 2000 BSDi * Copyright (c) 2007-2012 Jung-uk Kim * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * 6.3 : Scheduling services */ #include #include "opt_acpi.h" #include #include #include #include #include #include #include #include #include #include #include #define _COMPONENT ACPI_OS_SERVICES ACPI_MODULE_NAME("SCHEDULE") /* * Allow the user to tune the maximum number of tasks we may enqueue. */ static int acpi_max_tasks = ACPI_MAX_TASKS; SYSCTL_INT(_debug_acpi, OID_AUTO, max_tasks, CTLFLAG_RDTUN, &acpi_max_tasks, 0, "Maximum acpi tasks"); /* * Track and report the system's demand for task slots. */ static int acpi_tasks_hiwater; SYSCTL_INT(_debug_acpi, OID_AUTO, tasks_hiwater, CTLFLAG_RD, &acpi_tasks_hiwater, 1, "Peak demand for ACPI event task slots."); /* * Allow the user to tune the number of task threads we start. It seems * some systems have problems with increased parallelism. */ static int acpi_max_threads = ACPI_MAX_THREADS; SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads, 0, "Maximum acpi threads"); static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); struct acpi_task_ctx { struct task at_task; ACPI_OSD_EXEC_CALLBACK at_function; void *at_context; int at_flag; #define ACPI_TASK_FREE 0 #define ACPI_TASK_USED 1 #define ACPI_TASK_ENQUEUED 2 }; struct taskqueue *acpi_taskq; static struct acpi_task_ctx *acpi_tasks; static int acpi_task_count; static int acpi_taskq_started; /* * Preallocate some memory for tasks early enough. * malloc(9) cannot be used with spin lock held. */ static void acpi_task_init(void *arg) { acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK, M_WAITOK | M_ZERO); } SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL); /* * Initialize ACPI task queue. */ static void acpi_taskq_init(void *arg) { int i; acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT, &taskqueue_thread_enqueue, &acpi_taskq); taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task"); if (acpi_task_count > 0) { if (bootverbose) printf("AcpiOsExecute: enqueue %d pending tasks\n", acpi_task_count); for (i = 0; i < acpi_max_tasks; i++) if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED, ACPI_TASK_USED | ACPI_TASK_ENQUEUED)) taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task); } acpi_taskq_started = 1; } SYSINIT(acpi_taskq, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_taskq_init, NULL); /* * Bounce through this wrapper function since ACPI-CA doesn't understand * the pending argument for its callbacks. */ static void acpi_task_execute(void *context, int pending) { struct acpi_task_ctx *at; at = (struct acpi_task_ctx *)context; at->at_function(at->at_context); atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED); acpi_task_count--; } static ACPI_STATUS acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context) { struct acpi_task_ctx *at; int i; for (at = NULL, i = 0; i < acpi_max_tasks; i++) if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE, ACPI_TASK_USED)) { at = &acpi_tasks[i]; acpi_task_count++; break; } if (i > acpi_tasks_hiwater) atomic_cmpset_int(&acpi_tasks_hiwater, acpi_tasks_hiwater, i); if (at == NULL) { printf("AcpiOsExecute: failed to enqueue task, consider increasing " "the debug.acpi.max_tasks tunable\n"); return (AE_NO_MEMORY); } TASK_INIT(&at->at_task, priority, acpi_task_execute, at); at->at_function = Function; at->at_context = Context; /* * If the task queue is ready, enqueue it now. */ if (acpi_taskq_started) { atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED); taskqueue_enqueue(acpi_taskq, &at->at_task); return (AE_OK); } if (bootverbose) printf("AcpiOsExecute: task queue not started\n"); return (AE_OK); } /* * This function may be called in interrupt context, i.e. when a GPE fires. * We allocate and queue a task for one of our taskqueue threads to process. */ ACPI_STATUS AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, void *Context) { ACPI_STATUS status; int pri; ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); if (Function == NULL) return_ACPI_STATUS(AE_BAD_PARAMETER); switch (Type) { case OSL_GPE_HANDLER: case OSL_NOTIFY_HANDLER: /* * Run GPEs and Notifies at the same priority. This allows * Notifies that are generated by running a GPE's method (e.g., _L00) * to not be pre-empted by a later GPE that arrives during the * Notify handler execution. */ pri = 10; break; case OSL_GLOBAL_LOCK_HANDLER: case OSL_EC_POLL_HANDLER: case OSL_EC_BURST_HANDLER: pri = 5; break; case OSL_DEBUGGER_MAIN_THREAD: case OSL_DEBUGGER_EXEC_THREAD: pri = 0; break; default: return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_task_enqueue(pri, Function, Context); return_ACPI_STATUS(status); } void AcpiOsWaitEventsComplete(void) { int i; ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); for (i = 0; i < acpi_max_tasks; i++) if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) & ACPI_TASK_ENQUEUED) != 0) taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task); return_VOID; } void AcpiOsSleep(UINT64 Milliseconds) { int timo; ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); timo = Milliseconds * hz / 1000; /* * If requested sleep time is less than our hz resolution, use * DELAY instead for better granularity. */ if (timo > 0) pause("acpislp", timo); else DELAY(Milliseconds * 1000); return_VOID; } /* * Return the current time in 100 nanosecond units */ UINT64 AcpiOsGetTimer(void) { struct bintime bt; UINT64 t; binuptime(&bt); t = (uint64_t)bt.sec * 10000000; t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; return (t); } void AcpiOsStall(UINT32 Microseconds) { ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); DELAY(Microseconds); return_VOID; } ACPI_THREAD_ID AcpiOsGetThreadId(void) { /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ /* Returning 0 is not allowed. */ return (curthread->td_tid); }