usr/src/uts/common/xen/public/sched.h

   1 /******************************************************************************
   2  * sched.h
   3  *
   4  * Scheduler state interactions
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to
   8  * deal in the Software without restriction, including without limitation the
   9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
  25  */
  26
  27 #ifndef __XEN_PUBLIC_SCHED_H__
  28 #define __XEN_PUBLIC_SCHED_H__
  29
  30 #include "event_channel.h"
  31
  32 /*
  33  * The prototype for this hypercall is:
  34  *  long sched_op(int cmd, void *arg)
  35  * @cmd == SCHEDOP_??? (scheduler operation).
  36  * @arg == Operation-specific extra argument(s), as described below.
  37  *
  38  * Versions of Xen prior to 3.0.2 provided only the following legacy version
  39  * of this hypercall, supporting only the commands yield, block and shutdown:
  40  *  long sched_op(int cmd, unsigned long arg)
  41  * @cmd == SCHEDOP_??? (scheduler operation).
  42  * @arg == 0               (SCHEDOP_yield and SCHEDOP_block)
  43  *      == SHUTDOWN_* code (SCHEDOP_shutdown)
  44  * This legacy version is available to new guests as sched_op_compat().
  45  */
  46
  47 /*
  48  * Voluntarily yield the CPU.
  49  * @arg == NULL.
  50  */
  51 #define SCHEDOP_yield       0
  52
  53 /*
  54  * Block execution of this VCPU until an event is received for processing.
  55  * If called with event upcalls masked, this operation will atomically
  56  * reenable event delivery and check for pending events before blocking the
  57  * VCPU. This avoids a "wakeup waiting" race.
  58  * @arg == NULL.
  59  */
  60 #define SCHEDOP_block       1
  61
  62 /*
  63  * Halt execution of this domain (all VCPUs) and notify the system controller.
  64  * @arg == pointer to sched_shutdown structure.
  65  */
  66 #define SCHEDOP_shutdown    2
  67 struct sched_shutdown {
  68     unsigned int reason; /* SHUTDOWN_* */
  69 };
  70 typedef struct sched_shutdown sched_shutdown_t;
  71 DEFINE_XEN_GUEST_HANDLE(sched_shutdown_t);
  72
  73 /*
  74  * Poll a set of event-channel ports. Return when one or more are pending. An
  75  * optional timeout may be specified.
  76  * @arg == pointer to sched_poll structure.
  77  */
  78 #define SCHEDOP_poll        3
  79 struct sched_poll {
  80     XEN_GUEST_HANDLE(evtchn_port_t) ports;
  81     unsigned int nr_ports;
  82     uint64_t timeout;
  83 };
  84 typedef struct sched_poll sched_poll_t;
  85 DEFINE_XEN_GUEST_HANDLE(sched_poll_t);
  86
  87 /*
  88  * Declare a shutdown for another domain. The main use of this function is
  89  * in interpreting shutdown requests and reasons for fully-virtualized
  90  * domains.  A para-virtualized domain may use SCHEDOP_shutdown directly.
  91  * @arg == pointer to sched_remote_shutdown structure.
  92  */
  93 #define SCHEDOP_remote_shutdown        4
  94 struct sched_remote_shutdown {
  95     domid_t domain_id;         /* Remote domain ID */
  96     unsigned int reason;       /* SHUTDOWN_xxx reason */
  97 };
  98 typedef struct sched_remote_shutdown sched_remote_shutdown_t;
  99 DEFINE_XEN_GUEST_HANDLE(sched_remote_shutdown_t);
 100
 101 /*
 102  * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
 103  * software to determine the appropriate action. For the most part, Xen does
 104  * not care about the shutdown code.
 105  */
 106 #define SHUTDOWN_poweroff   0  /* Domain exited normally. Clean up and kill. */
 107 #define SHUTDOWN_reboot     1  /* Clean up, kill, and then restart.          */
 108 #define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
 109 #define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */
 110
 111 #endif /* __XEN_PUBLIC_SCHED_H__ */
 112
 113 /*
 114  * Local variables:
 115  * mode: C
 116  * c-set-style: "BSD"
 117  * c-basic-offset: 4
 118  * tab-width: 4
 119  * indent-tabs-mode: nil
 120  * End:
 121  */