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: releng/10.1/sys/xen/xenbus/xenbusvar.h 255040 2013-08-29 19:52:18Z gibbs $
   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 #define XENBUS_ACCESSOR(var, ivar, type) \
   88         __BUS_ACCESSOR(xenbus, var, XENBUS, ivar, type)
   89 
   90 XENBUS_ACCESSOR(node,           NODE,                   const char *)
   91 XENBUS_ACCESSOR(type,           TYPE,                   const char *)
   92 XENBUS_ACCESSOR(state,          STATE,                  enum xenbus_state)
   93 XENBUS_ACCESSOR(otherend_id,    OTHEREND_ID,            int)
   94 XENBUS_ACCESSOR(otherend_path,  OTHEREND_PATH,          const char *)
   95 
   96 /**
   97  * Return the state of a XenBus device.
   98  *
   99  * \param path  The root XenStore path for the device.
  100  *
  101  * \return  The current state of the device or XenbusStateClosed if no
  102  *          state can be read.
  103  */
  104 XenbusState xenbus_read_driver_state(const char *path);
  105 
  106 /**
  107  * Return the state of the "other end" (peer) of a XenBus device.
  108  *
  109  * \param dev   The XenBus device whose peer to query.
  110  *
  111  * \return  The current state of the peer device or XenbusStateClosed if no
  112  *          state can be read.
  113  */
  114 static inline XenbusState
  115 xenbus_get_otherend_state(device_t dev)
  116 {
  117         return (xenbus_read_driver_state(xenbus_get_otherend_path(dev)));
  118 }
  119 
  120 /**
  121  * Initialize and register a watch on the given path (client suplied storage).
  122  *
  123  * \param dev       The XenBus device requesting the watch service.
  124  * \param path      The XenStore path of the object to be watched.  The
  125  *                  storage for this string must be stable for the lifetime
  126  *                  of the watch.
  127  * \param watch     The watch object to use for this request.  This object
  128  *                  must be stable for the lifetime of the watch.
  129  * \param callback  The function to call when XenStore objects at or below
  130  *                  path are modified.
  131  * \param cb_data   Client data that can be retrieved from the watch object
  132  *                  during the callback.
  133  *
  134  * \return  On success, 0. Otherwise an errno value indicating the
  135  *          type of failure.
  136  *
  137  * \note  On error, the device 'dev' will be switched to the XenbusStateClosing
  138  *        state and the returned error is saved in the per-device error node
  139  *        for dev in the XenStore.
  140  */
  141 int xenbus_watch_path(device_t dev, char *path,
  142                       struct xs_watch *watch, 
  143                       xs_watch_cb_t *callback,
  144                       uintptr_t cb_data);
  145 
  146 /**
  147  * Initialize and register a watch at path/path2 in the XenStore.
  148  *
  149  * \param dev       The XenBus device requesting the watch service.
  150  * \param path      The base XenStore path of the object to be watched.
  151  * \param path2     The tail XenStore path of the object to be watched.
  152  * \param watch     The watch object to use for this request.  This object
  153  *                  must be stable for the lifetime of the watch.
  154  * \param callback  The function to call when XenStore objects at or below
  155  *                  path are modified.
  156  * \param cb_data   Client data that can be retrieved from the watch object
  157  *                  during the callback.
  158  *
  159  * \return  On success, 0. Otherwise an errno value indicating the
  160  *          type of failure.
  161  *
  162  * \note  On error, \a dev will be switched to the XenbusStateClosing
  163  *        state and the returned error is saved in the per-device error node
  164  *        for \a dev in the XenStore.
  165  *
  166  * Similar to xenbus_watch_path, however the storage for the path to the
  167  * watched object is allocated from the heap and filled with "path '/' path2".
  168  * Should a call to this function succeed, it is the callers responsibility
  169  * to free watch->node using the M_XENBUS malloc type.
  170  */
  171 int xenbus_watch_path2(device_t dev, const char *path,
  172                        const char *path2, struct xs_watch *watch, 
  173                        xs_watch_cb_t *callback,
  174                        uintptr_t cb_data);
  175 
  176 /**
  177  * Grant access to the given ring_mfn to the peer of the given device.
  178  *
  179  * \param dev        The device granting access to the ring page.
  180  * \param ring_mfn   The guest machine page number of the page to grant
  181  *                   peer access rights.
  182  * \param refp[out]  The grant reference for the page.
  183  *
  184  * \return  On success, 0. Otherwise an errno value indicating the
  185  *          type of failure.
  186  *
  187  * A successful call to xenbus_grant_ring should be paired with a call
  188  * to gnttab_end_foreign_access() when foregn access to this page is no
  189  * longer requried.
  190  * 
  191  * \note  On error, \a dev will be switched to the XenbusStateClosing
  192  *        state and the returned error is saved in the per-device error node
  193  *        for \a dev in the XenStore.
  194  */
  195 int xenbus_grant_ring(device_t dev, unsigned long ring_mfn, grant_ref_t *refp);
  196 
  197 /**
  198  * Record the given errno, along with the given, printf-style, formatted
  199  * message in dev's device specific error node in the XenStore.
  200  *
  201  * \param dev  The device which encountered the error.
  202  * \param err  The errno value corresponding to the error.
  203  * \param fmt  Printf format string followed by a variable number of
  204  *             printf arguments.
  205  */
  206 void xenbus_dev_error(device_t dev, int err, const char *fmt, ...)
  207         __attribute__((format(printf, 3, 4)));
  208 
  209 /**
  210  * va_list version of xenbus_dev_error().
  211  *
  212  * \param dev  The device which encountered the error.
  213  * \param err  The errno value corresponding to the error.
  214  * \param fmt  Printf format string.
  215  * \param ap   Va_list of printf arguments.
  216  */
  217 void xenbus_dev_verror(device_t dev, int err, const char *fmt, va_list ap)
  218         __attribute__((format(printf, 3, 0)));
  219 
  220 /**
  221  * Equivalent to xenbus_dev_error(), followed by
  222  * xenbus_set_state(dev, XenbusStateClosing).
  223  *
  224  * \param dev  The device which encountered the error.
  225  * \param err  The errno value corresponding to the error.
  226  * \param fmt  Printf format string followed by a variable number of
  227  *             printf arguments.
  228  */
  229 void xenbus_dev_fatal(device_t dev, int err, const char *fmt, ...)
  230         __attribute__((format(printf, 3, 4)));
  231 
  232 /**
  233  * va_list version of xenbus_dev_fatal().
  234  *
  235  * \param dev  The device which encountered the error.
  236  * \param err  The errno value corresponding to the error.
  237  * \param fmt  Printf format string.
  238  * \param ap   Va_list of printf arguments.
  239  */
  240 void xenbus_dev_vfatal(device_t dev, int err, const char *fmt, va_list)
  241         __attribute__((format(printf, 3, 0)));
  242 
  243 /**
  244  * Convert a member of the xenbus_state enum into an ASCII string.
  245  *
  246  * /param state  The XenBus state to lookup.
  247  *
  248  * /return  A string representing state or, for unrecognized states,
  249  *          the string "Unknown".
  250  */
  251 const char *xenbus_strstate(enum xenbus_state state);
  252 
  253 /**
  254  * Return the value of a XenBus device's "online" node within the XenStore.
  255  *
  256  * \param dev  The XenBus device to query.
  257  *
  258  * \return  The value of the "online" node for the device.  If the node
  259  *          does not exist, 0 (offline) is returned.
  260  */
  261 int xenbus_dev_is_online(device_t dev);
  262 
  263 /**
  264  * Default callback invoked when a change to the local XenStore sub-tree
  265  * for a device is modified.
  266  * 
  267  * \param dev   The XenBus device whose tree was modified.
  268  * \param path  The tree relative sub-path to the modified node.  The empty
  269  *              string indicates the root of the tree was destroyed.
  270  */
  271 void xenbus_localend_changed(device_t dev, const char *path);
  272 
  273 #include "xenbus_if.h"
  274 
  275 #endif /* _XEN_XENBUS_XENBUSVAR_H */

Cache object: 4fb5cf690b000e272206b0c5c268ad95


[ 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.