FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/Osd/OsdSchedule.c

     /*-
      * Copyright (c) 2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * Copyright (c) 2007-2012 Jung-uk Kim <jkim@FreeBSD.org>
      * 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/kthread.h>
    #include <sys/malloc.h>
    #include <sys/proc.h>
    #include <sys/taskqueue.h>
    
    #include <contrib/dev/acpica/include/acpi.h>
    #include <contrib/dev/acpica/include/accommon.h>
    
    #include <dev/acpica/acpivar.h>
    
    #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);
   }

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