FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/sched.h

     /******************************************************************************
      * sched.h
      *
      * Scheduler state interactions
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
      * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
     */
    
    #ifndef __XEN_PUBLIC_SCHED_H__
    #define __XEN_PUBLIC_SCHED_H__
    
    #include "event_channel.h"
    
    /*
     * `incontents 150 sched Guest Scheduler Operations
     *
     * The SCHEDOP interface provides mechanisms for a guest to interact
     * with the scheduler, including yield, blocking and shutting itself
     * down.
     */
    
    /*
     * The prototype for this hypercall is:
     * ` long HYPERVISOR_sched_op(enum sched_op cmd, void *arg, ...)
     *
     * @cmd == SCHEDOP_??? (scheduler operation).
     * @arg == Operation-specific extra argument(s), as described below.
     * ...  == Additional Operation-specific extra arguments, described below.
     *
     * Versions of Xen prior to 3.0.2 provided only the following legacy version
     * of this hypercall, supporting only the commands yield, block and shutdown:
     *  long sched_op(int cmd, unsigned long arg)
     * @cmd == SCHEDOP_??? (scheduler operation).
     * @arg == 0               (SCHEDOP_yield and SCHEDOP_block)
     *      == SHUTDOWN_* code (SCHEDOP_shutdown)
     *
     * This legacy version is available to new guests as:
     * ` long HYPERVISOR_sched_op_compat(enum sched_op cmd, unsigned long arg)
     */
    
    /* ` enum sched_op { // SCHEDOP_* => struct sched_* */
    /*
     * Voluntarily yield the CPU.
     * @arg == NULL.
     */
    #define SCHEDOP_yield       0
    
    /*
     * Block execution of this VCPU until an event is received for processing.
     * If called with event upcalls masked, this operation will atomically
     * reenable event delivery and check for pending events before blocking the
     * VCPU. This avoids a "wakeup waiting" race.
     * @arg == NULL.
     */
    #define SCHEDOP_block       1
    
    /*
     * Halt execution of this domain (all VCPUs) and notify the system controller.
     * @arg == pointer to sched_shutdown_t structure.
     *
     * If the sched_shutdown_t reason is SHUTDOWN_suspend then
     * x86 PV guests must also set RDX (EDX for 32-bit guests) to the MFN
     * of the guest's start info page.  RDX/EDX is the third hypercall
     * argument.
     *
     * In addition, which reason is SHUTDOWN_suspend this hypercall
     * returns 1 if suspend was cancelled or the domain was merely
     * checkpointed, and 0 if it is resuming in a new domain.
     */
    #define SCHEDOP_shutdown    2
    
    /*
     * Poll a set of event-channel ports. Return when one or more are pending. An
     * optional timeout may be specified.
     * @arg == pointer to sched_poll_t structure.
     */
    #define SCHEDOP_poll        3
    
    /*
     * Declare a shutdown for another domain. The main use of this function is
     * in interpreting shutdown requests and reasons for fully-virtualized
    * domains.  A para-virtualized domain may use SCHEDOP_shutdown directly.
    * @arg == pointer to sched_remote_shutdown_t structure.
    */
   #define SCHEDOP_remote_shutdown        4
   
   /*
    * Latch a shutdown code, so that when the domain later shuts down it
    * reports this code to the control tools.
    * @arg == sched_shutdown_t, as for SCHEDOP_shutdown.
    */
   #define SCHEDOP_shutdown_code 5
   
   /*
    * Setup, poke and destroy a domain watchdog timer.
    * @arg == pointer to sched_watchdog_t structure.
    * With id == 0, setup a domain watchdog timer to cause domain shutdown
    *               after timeout, returns watchdog id.
    * With id != 0 and timeout == 0, destroy domain watchdog timer.
    * With id != 0 and timeout != 0, poke watchdog timer and set new timeout.
    */
   #define SCHEDOP_watchdog    6
   
   /*
    * Override the current vcpu affinity by pinning it to one physical cpu or
    * undo this override restoring the previous affinity.
    * @arg == pointer to sched_pin_override_t structure.
    *
    * A negative pcpu value will undo a previous pin override and restore the
    * previous cpu affinity.
    * This call is allowed for the hardware domain only and requires the cpu
    * to be part of the domain's cpupool.
    */
   #define SCHEDOP_pin_override 7
   /* ` } */
   
   struct sched_shutdown {
       unsigned int reason; /* SHUTDOWN_* => enum sched_shutdown_reason */
   };
   typedef struct sched_shutdown sched_shutdown_t;
   DEFINE_XEN_GUEST_HANDLE(sched_shutdown_t);
   
   struct sched_poll {
       XEN_GUEST_HANDLE(evtchn_port_t) ports;
       unsigned int nr_ports;
       uint64_t timeout;
   };
   typedef struct sched_poll sched_poll_t;
   DEFINE_XEN_GUEST_HANDLE(sched_poll_t);
   
   struct sched_remote_shutdown {
       domid_t domain_id;         /* Remote domain ID */
       unsigned int reason;       /* SHUTDOWN_* => enum sched_shutdown_reason */
   };
   typedef struct sched_remote_shutdown sched_remote_shutdown_t;
   DEFINE_XEN_GUEST_HANDLE(sched_remote_shutdown_t);
   
   struct sched_watchdog {
       uint32_t id;                /* watchdog ID */
       uint32_t timeout;           /* timeout */
   };
   typedef struct sched_watchdog sched_watchdog_t;
   DEFINE_XEN_GUEST_HANDLE(sched_watchdog_t);
   
   struct sched_pin_override {
       int32_t pcpu;
   };
   typedef struct sched_pin_override sched_pin_override_t;
   DEFINE_XEN_GUEST_HANDLE(sched_pin_override_t);
   
   /*
    * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
    * software to determine the appropriate action. For the most part, Xen does
    * not care about the shutdown code.
    */
   /* ` enum sched_shutdown_reason { */
   #define SHUTDOWN_poweroff   0  /* Domain exited normally. Clean up and kill. */
   #define SHUTDOWN_reboot     1  /* Clean up, kill, and then restart.          */
   #define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
   #define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */
   #define SHUTDOWN_watchdog   4  /* Restart because watchdog time expired.     */
   
   /*
    * Domain asked to perform 'soft reset' for it. The expected behavior is to
    * reset internal Xen state for the domain returning it to the point where it
    * was created but leaving the domain's memory contents and vCPU contexts
    * intact. This will allow the domain to start over and set up all Xen specific
    * interfaces again.
    */
   #define SHUTDOWN_soft_reset 5
   #define SHUTDOWN_MAX        5  /* Maximum valid shutdown reason.             */
   /* ` } */
   
   #endif /* __XEN_PUBLIC_SCHED_H__ */
   
   /*
    * Local variables:
    * mode: C
    * c-file-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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