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