The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/xen/xenbus/xenbusvar.h

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    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/12.0/sys/xen/xenbus/xenbusvar.h 294090 2016-01-15 14:34:31Z royger $
   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  * Initialize and register a watch on the given path (client suplied storage).
  128  *
  129  * \param dev       The XenBus device requesting the watch service.
  130  * \param path      The XenStore path of the object to be watched.  The
  131  *                  storage for this string must be stable for the lifetime
  132  *                  of the watch.
  133  * \param watch     The watch object to use for this request.  This object
  134  *                  must be stable for the lifetime of the watch.
  135  * \param callback  The function to call when XenStore objects at or below
  136  *                  path are modified.
  137  * \param cb_data   Client data that can be retrieved from the watch object
  138  *                  during the callback.
  139  *
  140  * \return  On success, 0. Otherwise an errno value indicating the
  141  *          type of failure.
  142  *
  143  * \note  On error, the device 'dev' will be switched to the XenbusStateClosing
  144  *        state and the returned error is saved in the per-device error node
  145  *        for dev in the XenStore.
  146  */
  147 int xenbus_watch_path(device_t dev, char *path,
  148                       struct xs_watch *watch, 
  149                       xs_watch_cb_t *callback,
  150                       uintptr_t cb_data);
  151 
  152 /**
  153  * Initialize and register a watch at path/path2 in the XenStore.
  154  *
  155  * \param dev       The XenBus device requesting the watch service.
  156  * \param path      The base XenStore path of the object to be watched.
  157  * \param path2     The tail XenStore path of the object to be watched.
  158  * \param watch     The watch object to use for this request.  This object
  159  *                  must be stable for the lifetime of the watch.
  160  * \param callback  The function to call when XenStore objects at or below
  161  *                  path are modified.
  162  * \param cb_data   Client data that can be retrieved from the watch object
  163  *                  during the callback.
  164  *
  165  * \return  On success, 0. Otherwise an errno value indicating the
  166  *          type of failure.
  167  *
  168  * \note  On error, \a dev will be switched to the XenbusStateClosing
  169  *        state and the returned error is saved in the per-device error node
  170  *        for \a dev in the XenStore.
  171  *
  172  * Similar to xenbus_watch_path, however the storage for the path to the
  173  * watched object is allocated from the heap and filled with "path '/' path2".
  174  * Should a call to this function succeed, it is the callers responsibility
  175  * to free watch->node using the M_XENBUS malloc type.
  176  */
  177 int xenbus_watch_path2(device_t dev, const char *path,
  178                        const char *path2, struct xs_watch *watch, 
  179                        xs_watch_cb_t *callback,
  180                        uintptr_t cb_data);
  181 
  182 /**
  183  * Grant access to the given ring_mfn to the peer of the given device.
  184  *
  185  * \param dev        The device granting access to the ring page.
  186  * \param ring_mfn   The guest machine page number of the page to grant
  187  *                   peer access rights.
  188  * \param refp[out]  The grant reference for the page.
  189  *
  190  * \return  On success, 0. Otherwise an errno value indicating the
  191  *          type of failure.
  192  *
  193  * A successful call to xenbus_grant_ring should be paired with a call
  194  * to gnttab_end_foreign_access() when foregn access to this page is no
  195  * longer requried.
  196  * 
  197  * \note  On error, \a dev will be switched to the XenbusStateClosing
  198  *        state and the returned error is saved in the per-device error node
  199  *        for \a dev in the XenStore.
  200  */
  201 int xenbus_grant_ring(device_t dev, unsigned long ring_mfn, grant_ref_t *refp);
  202 
  203 /**
  204  * Record the given errno, along with the given, printf-style, formatted
  205  * message in dev's device specific error node in the XenStore.
  206  *
  207  * \param dev  The device which encountered the error.
  208  * \param err  The errno value corresponding to the error.
  209  * \param fmt  Printf format string followed by a variable number of
  210  *             printf arguments.
  211  */
  212 void xenbus_dev_error(device_t dev, int err, const char *fmt, ...)
  213         __attribute__((format(printf, 3, 4)));
  214 
  215 /**
  216  * va_list version of xenbus_dev_error().
  217  *
  218  * \param dev  The device which encountered the error.
  219  * \param err  The errno value corresponding to the error.
  220  * \param fmt  Printf format string.
  221  * \param ap   Va_list of printf arguments.
  222  */
  223 void xenbus_dev_verror(device_t dev, int err, const char *fmt, va_list ap)
  224         __attribute__((format(printf, 3, 0)));
  225 
  226 /**
  227  * Equivalent to xenbus_dev_error(), followed by
  228  * xenbus_set_state(dev, XenbusStateClosing).
  229  *
  230  * \param dev  The device which encountered the error.
  231  * \param err  The errno value corresponding to the error.
  232  * \param fmt  Printf format string followed by a variable number of
  233  *             printf arguments.
  234  */
  235 void xenbus_dev_fatal(device_t dev, int err, const char *fmt, ...)
  236         __attribute__((format(printf, 3, 4)));
  237 
  238 /**
  239  * va_list version of xenbus_dev_fatal().
  240  *
  241  * \param dev  The device which encountered the error.
  242  * \param err  The errno value corresponding to the error.
  243  * \param fmt  Printf format string.
  244  * \param ap   Va_list of printf arguments.
  245  */
  246 void xenbus_dev_vfatal(device_t dev, int err, const char *fmt, va_list)
  247         __attribute__((format(printf, 3, 0)));
  248 
  249 /**
  250  * Convert a member of the xenbus_state enum into an ASCII string.
  251  *
  252  * /param state  The XenBus state to lookup.
  253  *
  254  * /return  A string representing state or, for unrecognized states,
  255  *          the string "Unknown".
  256  */
  257 const char *xenbus_strstate(enum xenbus_state state);
  258 
  259 /**
  260  * Return the value of a XenBus device's "online" node within the XenStore.
  261  *
  262  * \param dev  The XenBus device to query.
  263  *
  264  * \return  The value of the "online" node for the device.  If the node
  265  *          does not exist, 0 (offline) is returned.
  266  */
  267 int xenbus_dev_is_online(device_t dev);
  268 
  269 /**
  270  * Default callback invoked when a change to the local XenStore sub-tree
  271  * for a device is modified.
  272  * 
  273  * \param dev   The XenBus device whose tree was modified.
  274  * \param path  The tree relative sub-path to the modified node.  The empty
  275  *              string indicates the root of the tree was destroyed.
  276  */
  277 void xenbus_localend_changed(device_t dev, const char *path);
  278 
  279 #include "xenbus_if.h"
  280 
  281 #endif /* _XEN_XENBUS_XENBUSVAR_H */

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