The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/xen/xenbus/xenbusvar.h

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /******************************************************************************
    2  * Copyright (C) 2005 Rusty Russell, IBM Corporation
    3  * Copyright (C) 2005 XenSource Ltd.
    4  * 
    5  * This file may be distributed separately from the Linux kernel, or
    6  * incorporated into other software packages, subject to the following license:
    7  * 
    8  * Permission is hereby granted, free of charge, to any person obtaining a copy
    9  * of this source file (the "Software"), to deal in the Software without
   10  * restriction, including without limitation the rights to use, copy, modify,
   11  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
   12  * and to permit persons to whom the Software is furnished to do so, subject to
   13  * the following conditions:
   14  * 
   15  * The above copyright notice and this permission notice shall be included in
   16  * all copies or substantial portions of the Software.
   17  * 
   18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   24  * IN THE SOFTWARE.
   25  *
   26  * $FreeBSD: stable/11/sys/xen/xenbus/xenbusvar.h 369046 2021-01-18 18:57:03Z emaste $
   27  */
   28 
   29 /**
   30  * \file xenbusvar.h
   31  *
   32  * \brief Datastructures and function declarations for usedby device
   33  *        drivers operating on the XenBus.
   34  */
   35 
   36 #ifndef _XEN_XENBUS_XENBUSVAR_H
   37 #define _XEN_XENBUS_XENBUSVAR_H
   38 
   39 #include <sys/queue.h>
   40 #include <sys/bus.h>
   41 #include <sys/eventhandler.h>
   42 #include <sys/malloc.h>
   43 #include <sys/sbuf.h>
   44 
   45 #include <machine/stdarg.h>
   46 
   47 #include <xen/xen-os.h>
   48 #include <xen/interface/grant_table.h>
   49 #include <xen/interface/io/xenbus.h>
   50 #include <xen/interface/io/xs_wire.h>
   51 
   52 #include <xen/xenstore/xenstorevar.h>
   53 
   54 /* XenBus allocations including XenStore data returned to clients. */
   55 MALLOC_DECLARE(M_XENBUS);
   56 
   57 enum {
   58         /**
   59          * Path of this device node.
   60          */
   61         XENBUS_IVAR_NODE,
   62 
   63         /**
   64          * The device type (e.g. vif, vbd).
   65          */
   66         XENBUS_IVAR_TYPE,
   67 
   68         /**
   69          * The state of this device (not the otherend's state).
   70          */
   71         XENBUS_IVAR_STATE,
   72 
   73         /**
   74          * Domain ID of the other end device.
   75          */
   76         XENBUS_IVAR_OTHEREND_ID,
   77 
   78         /**
   79          * Path of the other end device.
   80          */
   81         XENBUS_IVAR_OTHEREND_PATH
   82 };
   83 
   84 /**
   85  * Simplified accessors for xenbus devices:
   86  *
   87  * xenbus_get_node
   88  * xenbus_get_type
   89  * xenbus_get_state
   90  * xenbus_get_otherend_id
   91  * xenbus_get_otherend_path
   92  */
   93 #define XENBUS_ACCESSOR(var, ivar, type) \
   94         __BUS_ACCESSOR(xenbus, var, XENBUS, ivar, type)
   95 
   96 XENBUS_ACCESSOR(node,           NODE,                   const char *)
   97 XENBUS_ACCESSOR(type,           TYPE,                   const char *)
   98 XENBUS_ACCESSOR(state,          STATE,                  enum xenbus_state)
   99 XENBUS_ACCESSOR(otherend_id,    OTHEREND_ID,            int)
  100 XENBUS_ACCESSOR(otherend_path,  OTHEREND_PATH,          const char *)
  101 
  102 /**
  103  * Return the state of a XenBus device.
  104  *
  105  * \param path  The root XenStore path for the device.
  106  *
  107  * \return  The current state of the device or XenbusStateClosed if no
  108  *          state can be read.
  109  */
  110 XenbusState xenbus_read_driver_state(const char *path);
  111 
  112 /**
  113  * Return the state of the "other end" (peer) of a XenBus device.
  114  *
  115  * \param dev   The XenBus device whose peer to query.
  116  *
  117  * \return  The current state of the peer device or XenbusStateClosed if no
  118  *          state can be read.
  119  */
  120 static inline XenbusState
  121 xenbus_get_otherend_state(device_t dev)
  122 {
  123         return (xenbus_read_driver_state(xenbus_get_otherend_path(dev)));
  124 }
  125 
  126 /**
  127  * Grant access to the given ring_mfn to the peer of the given device.
  128  *
  129  * \param dev        The device granting access to the ring page.
  130  * \param ring_mfn   The guest machine page number of the page to grant
  131  *                   peer access rights.
  132  * \param refp[out]  The grant reference for the page.
  133  *
  134  * \return  On success, 0. Otherwise an errno value indicating the
  135  *          type of failure.
  136  *
  137  * A successful call to xenbus_grant_ring should be paired with a call
  138  * to gnttab_end_foreign_access() when foregn access to this page is no
  139  * longer requried.
  140  * 
  141  * \note  On error, \a dev will be switched to the XenbusStateClosing
  142  *        state and the returned error is saved in the per-device error node
  143  *        for \a dev in the XenStore.
  144  */
  145 int xenbus_grant_ring(device_t dev, unsigned long ring_mfn, grant_ref_t *refp);
  146 
  147 /**
  148  * Record the given errno, along with the given, printf-style, formatted
  149  * message in dev's device specific error node in the XenStore.
  150  *
  151  * \param dev  The device which encountered the error.
  152  * \param err  The errno value corresponding to the error.
  153  * \param fmt  Printf format string followed by a variable number of
  154  *             printf arguments.
  155  */
  156 void xenbus_dev_error(device_t dev, int err, const char *fmt, ...)
  157         __attribute__((format(printf, 3, 4)));
  158 
  159 /**
  160  * va_list version of xenbus_dev_error().
  161  *
  162  * \param dev  The device which encountered the error.
  163  * \param err  The errno value corresponding to the error.
  164  * \param fmt  Printf format string.
  165  * \param ap   Va_list of printf arguments.
  166  */
  167 void xenbus_dev_verror(device_t dev, int err, const char *fmt, va_list ap)
  168         __attribute__((format(printf, 3, 0)));
  169 
  170 /**
  171  * Equivalent to xenbus_dev_error(), followed by
  172  * xenbus_set_state(dev, XenbusStateClosing).
  173  *
  174  * \param dev  The device which encountered the error.
  175  * \param err  The errno value corresponding to the error.
  176  * \param fmt  Printf format string followed by a variable number of
  177  *             printf arguments.
  178  */
  179 void xenbus_dev_fatal(device_t dev, int err, const char *fmt, ...)
  180         __attribute__((format(printf, 3, 4)));
  181 
  182 /**
  183  * va_list version of xenbus_dev_fatal().
  184  *
  185  * \param dev  The device which encountered the error.
  186  * \param err  The errno value corresponding to the error.
  187  * \param fmt  Printf format string.
  188  * \param ap   Va_list of printf arguments.
  189  */
  190 void xenbus_dev_vfatal(device_t dev, int err, const char *fmt, va_list)
  191         __attribute__((format(printf, 3, 0)));
  192 
  193 /**
  194  * Convert a member of the xenbus_state enum into an ASCII string.
  195  *
  196  * /param state  The XenBus state to lookup.
  197  *
  198  * /return  A string representing state or, for unrecognized states,
  199  *          the string "Unknown".
  200  */
  201 const char *xenbus_strstate(enum xenbus_state state);
  202 
  203 /**
  204  * Return the value of a XenBus device's "online" node within the XenStore.
  205  *
  206  * \param dev  The XenBus device to query.
  207  *
  208  * \return  The value of the "online" node for the device.  If the node
  209  *          does not exist, 0 (offline) is returned.
  210  */
  211 int xenbus_dev_is_online(device_t dev);
  212 
  213 /**
  214  * Default callback invoked when a change to the local XenStore sub-tree
  215  * for a device is modified.
  216  * 
  217  * \param dev   The XenBus device whose tree was modified.
  218  * \param path  The tree relative sub-path to the modified node.  The empty
  219  *              string indicates the root of the tree was destroyed.
  220  */
  221 void xenbus_localend_changed(device_t dev, const char *path);
  222 
  223 #include "xenbus_if.h"
  224 
  225 #endif /* _XEN_XENBUS_XENBUSVAR_H */

Cache object: bb368cfafb5484593ccb725d6c133327


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.