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


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FreeBSD/Linux Kernel Cross Reference
sys/xen/xenbus/xenbus.c

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    1 /******************************************************************************
    2  * Copyright (C) 2005 XenSource Ltd
    3  * 
    4  * This file may be distributed separately from the Linux kernel, or
    5  * incorporated into other software packages, subject to the following license:
    6  * 
    7  * Permission is hereby granted, free of charge, to any person obtaining a copy
    8  * of this source file (the "Software"), to deal in the Software without
    9  * restriction, including without limitation the rights to use, copy, modify,
   10  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
   11  * and to permit persons to whom the Software is furnished to do so, subject to
   12  * the following conditions:
   13  * 
   14  * The above copyright notice and this permission notice shall be included in
   15  * all copies or substantial portions of the Software.
   16  * 
   17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   23  * IN THE SOFTWARE.
   24  */
   25 
   26 /**
   27  * \file xenbus.c
   28  *
   29  * \brief Client-facing interface for the Xenbus driver.
   30  *
   31  * In other words, the interface between the Xenbus and the device-specific
   32  * code, be it the frontend or the backend of that driver.
   33  */
   34 
   35 #if 0
   36 #define DPRINTK(fmt, args...) \
   37     printk("xenbus_client (%s:%d) " fmt ".\n", __FUNCTION__, __LINE__, ##args)
   38 #else
   39 #define DPRINTK(fmt, args...) ((void)0)
   40 #endif
   41 
   42 #include <sys/cdefs.h>
   43 __FBSDID("$FreeBSD: releng/10.3/sys/xen/xenbus/xenbus.c 255040 2013-08-29 19:52:18Z gibbs $");
   44 
   45 #include <sys/cdefs.h>
   46 #include <sys/param.h>
   47 #include <sys/kernel.h>
   48 #include <sys/types.h>
   49 #include <sys/malloc.h>
   50 #include <sys/libkern.h>
   51 #include <sys/sbuf.h>
   52 
   53 #include <xen/xen-os.h>
   54 #include <xen/hypervisor.h>
   55 #include <xen/evtchn.h>
   56 #include <xen/gnttab.h>
   57 #include <xen/xenbus/xenbusvar.h>
   58 
   59 #include <machine/stdarg.h>
   60 
   61 MALLOC_DEFINE(M_XENBUS, "xenbus", "XenBus Support");
   62 
   63 /*------------------------- Private Functions --------------------------------*/
   64 /**
   65  * \brief Construct the error path corresponding to the given XenBus
   66  *        device.
   67  *
   68  * \param dev  The XenBus device for which we are constructing an error path.
   69  *
   70  * \return  On success, the contructed error path.  Otherwise NULL.
   71  *
   72  * It is the caller's responsibility to free any returned error path
   73  * node using the M_XENBUS malloc type.
   74  */
   75 static char *
   76 error_path(device_t dev)
   77 {
   78         char *path_buffer = malloc(strlen("error/")
   79             + strlen(xenbus_get_node(dev)) + 1,M_XENBUS, M_WAITOK);
   80 
   81         strcpy(path_buffer, "error/");
   82         strcpy(path_buffer + strlen("error/"), xenbus_get_node(dev));
   83 
   84         return (path_buffer);
   85 }
   86 
   87 /*--------------------------- Public Functions -------------------------------*/
   88 /*-------- API comments for these methods can be found in xenbusvar.h --------*/
   89 const char *
   90 xenbus_strstate(XenbusState state)
   91 {
   92         static const char *const name[] = {
   93                 [ XenbusStateUnknown      ] = "Unknown",
   94                 [ XenbusStateInitialising ] = "Initialising",
   95                 [ XenbusStateInitWait     ] = "InitWait",
   96                 [ XenbusStateInitialised  ] = "Initialised",
   97                 [ XenbusStateConnected    ] = "Connected",
   98                 [ XenbusStateClosing      ] = "Closing",
   99                 [ XenbusStateClosed       ] = "Closed",
  100         };
  101 
  102         return ((state < (XenbusStateClosed + 1)) ? name[state] : "INVALID");
  103 }
  104 
  105 int 
  106 xenbus_watch_path(device_t dev, char *path, struct xs_watch *watch, 
  107     xs_watch_cb_t *callback, uintptr_t callback_data)
  108 {
  109         int error;
  110 
  111         watch->node = path;
  112         watch->callback = callback;
  113         watch->callback_data = callback_data;
  114 
  115         error = xs_register_watch(watch);
  116 
  117         if (error) {
  118                 watch->node = NULL;
  119                 watch->callback = NULL;
  120                 xenbus_dev_fatal(dev, error, "adding watch on %s", path);
  121         }
  122 
  123         return (error);
  124 }
  125 
  126 int
  127 xenbus_watch_path2(device_t dev, const char *path,
  128     const char *path2, struct xs_watch *watch, 
  129     xs_watch_cb_t *callback, uintptr_t callback_data)
  130 {
  131         int error;
  132         char *state = malloc(strlen(path) + 1 + strlen(path2) + 1,
  133            M_XENBUS, M_WAITOK);
  134 
  135         strcpy(state, path);
  136         strcat(state, "/");
  137         strcat(state, path2);
  138 
  139         error = xenbus_watch_path(dev, state, watch, callback, callback_data);
  140         if (error) {
  141                 free(state,M_XENBUS);
  142         }
  143 
  144         return (error);
  145 }
  146 
  147 void
  148 xenbus_dev_verror(device_t dev, int err, const char *fmt, va_list ap)
  149 {
  150         int ret;
  151         unsigned int len;
  152         char *printf_buffer = NULL, *path_buffer = NULL;
  153 
  154 #define PRINTF_BUFFER_SIZE 4096
  155         printf_buffer = malloc(PRINTF_BUFFER_SIZE,M_XENBUS, M_WAITOK);
  156 
  157         len = sprintf(printf_buffer, "%i ", err);
  158         ret = vsnprintf(printf_buffer+len, PRINTF_BUFFER_SIZE-len, fmt, ap);
  159 
  160         KASSERT(len + ret <= PRINTF_BUFFER_SIZE-1, ("xenbus error message too big"));
  161         device_printf(dev, "Error %s\n", printf_buffer);
  162         path_buffer = error_path(dev);
  163 
  164         if (path_buffer == NULL) {
  165                 printf("xenbus: failed to write error node for %s (%s)\n",
  166                        xenbus_get_node(dev), printf_buffer);
  167                 goto fail;
  168         }
  169 
  170         if (xs_write(XST_NIL, path_buffer, "error", printf_buffer) != 0) {
  171                 printf("xenbus: failed to write error node for %s (%s)\n",
  172                        xenbus_get_node(dev), printf_buffer);
  173                 goto fail;
  174         }
  175 
  176  fail:
  177         if (printf_buffer)
  178                 free(printf_buffer,M_XENBUS);
  179         if (path_buffer)
  180                 free(path_buffer,M_XENBUS);
  181 }
  182 
  183 void
  184 xenbus_dev_error(device_t dev, int err, const char *fmt, ...)
  185 {
  186         va_list ap;
  187 
  188         va_start(ap, fmt);
  189         xenbus_dev_verror(dev, err, fmt, ap);
  190         va_end(ap);
  191 }
  192 
  193 void
  194 xenbus_dev_vfatal(device_t dev, int err, const char *fmt, va_list ap)
  195 {
  196         xenbus_dev_verror(dev, err, fmt, ap);
  197         device_printf(dev, "Fatal error. Transitioning to Closing State\n");
  198         xenbus_set_state(dev, XenbusStateClosing);
  199 }
  200 
  201 void
  202 xenbus_dev_fatal(device_t dev, int err, const char *fmt, ...)
  203 {
  204         va_list ap;
  205 
  206         va_start(ap, fmt);
  207         xenbus_dev_vfatal(dev, err, fmt, ap);
  208         va_end(ap);
  209 }
  210 
  211 int
  212 xenbus_grant_ring(device_t dev, unsigned long ring_mfn, grant_ref_t *refp)
  213 {
  214         int error;
  215 
  216         error = gnttab_grant_foreign_access(
  217                 xenbus_get_otherend_id(dev), ring_mfn, 0, refp);
  218         if (error) {
  219                 xenbus_dev_fatal(dev, error, "granting access to ring page");
  220                 return (error);
  221         }
  222 
  223         return (0);
  224 }
  225 
  226 XenbusState
  227 xenbus_read_driver_state(const char *path)
  228 {
  229         XenbusState result;
  230         int error;
  231 
  232         error = xs_gather(XST_NIL, path, "state", "%d", &result, NULL);
  233         if (error)
  234                 result = XenbusStateClosed;
  235 
  236         return (result);
  237 }
  238 
  239 int
  240 xenbus_dev_is_online(device_t dev)
  241 {
  242         const char *path;
  243         int error;
  244         int value;
  245 
  246         path = xenbus_get_node(dev);
  247         error = xs_gather(XST_NIL, path, "online", "%d", &value, NULL);
  248         if (error != 0) {
  249                 /* Default to not online. */
  250                 value = 0;
  251         }
  252 
  253         return (value);
  254 }
  255 
  256 void
  257 xenbus_localend_changed(device_t dev, const char *path)
  258 {
  259 }

Cache object: 62444a7f3b273e2c9d85059f2e0363ab


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