066d6c7f4e
While the hypervisor change adding SCHEDOP_watchdog support included a daemon to make use of the new functionality, having a kernel driver for /dev/watchdog so that user space code doesn't need to distinguish non-Xen and Xen seems to be preferable. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/******************************************************************************
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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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* 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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* The prototype for this hypercall is:
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* long sched_op_new(int cmd, void *arg)
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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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*
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* **NOTE**:
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* Versions of Xen prior to 3.0.2 provide 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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/*
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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 structure.
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*/
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#define SCHEDOP_shutdown 2
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struct sched_shutdown {
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unsigned int reason; /* SHUTDOWN_* */
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};
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DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
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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 structure.
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*/
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#define SCHEDOP_poll 3
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struct sched_poll {
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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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DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
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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 structure.
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*/
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#define SCHEDOP_remote_shutdown 4
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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_xxx reason */
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};
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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 == 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 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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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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/*
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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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#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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#endif /* __XEN_PUBLIC_SCHED_H__ */
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