LXR linux/include/xen/interface/sched.h

   1/******************************************************************************
   2 * sched.h
   3 *
   4 * Scheduler state interactions
   5 *
   6 * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
   7 */
   8
   9#ifndef __XEN_PUBLIC_SCHED_H__
  10#define __XEN_PUBLIC_SCHED_H__
  11
  12#include "event_channel.h"
  13
  14/*
  15 * The prototype for this hypercall is:
  16 *  long sched_op_new(int cmd, void *arg)
  17 * @cmd == SCHEDOP_??? (scheduler operation).
  18 * @arg == Operation-specific extra argument(s), as described below.
  19 *
  20 * **NOTE**:
  21 * Versions of Xen prior to 3.0.2 provide only the following legacy version
  22 * of this hypercall, supporting only the commands yield, block and shutdown:
  23 *  long sched_op(int cmd, unsigned long arg)
  24 * @cmd == SCHEDOP_??? (scheduler operation).
  25 * @arg == 0               (SCHEDOP_yield and SCHEDOP_block)
  26 *      == SHUTDOWN_* code (SCHEDOP_shutdown)
  27 */
  28
  29/*
  30 * Voluntarily yield the CPU.
  31 * @arg == NULL.
  32 */
  33#define SCHEDOP_yield       0
  34
  35/*
  36 * Block execution of this VCPU until an event is received for processing.
  37 * If called with event upcalls masked, this operation will atomically
  38 * reenable event delivery and check for pending events before blocking the
  39 * VCPU. This avoids a "wakeup waiting" race.
  40 * @arg == NULL.
  41 */
  42#define SCHEDOP_block       1
  43
  44/*
  45 * Halt execution of this domain (all VCPUs) and notify the system controller.
  46 * @arg == pointer to sched_shutdown structure.
  47 */
  48#define SCHEDOP_shutdown    2
  49struct sched_shutdown {
  50    unsigned int reason; /* SHUTDOWN_* */
  51};
  52DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
  53
  54/*
  55 * Poll a set of event-channel ports. Return when one or more are pending. An
  56 * optional timeout may be specified.
  57 * @arg == pointer to sched_poll structure.
  58 */
  59#define SCHEDOP_poll        3
  60struct sched_poll {
  61    GUEST_HANDLE(evtchn_port_t) ports;
  62    unsigned int nr_ports;
  63    uint64_t timeout;
  64};
  65DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
  66
  67/*
  68 * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
  69 * software to determine the appropriate action. For the most part, Xen does
  70 * not care about the shutdown code.
  71 */
  72#define SHUTDOWN_poweroff   0  /* Domain exited normally. Clean up and kill. */
  73#define SHUTDOWN_reboot     1  /* Clean up, kill, and then restart.          */
  74#define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
  75#define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */
  76
  77#endif /* __XEN_PUBLIC_SCHED_H__ */
  78