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: stable/12/sys/xen/xenbus/xenbus.c 369037 2021-01-18 16:26:31Z git2svn $");
   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 void
  106 xenbus_dev_verror(device_t dev, int err, const char *fmt, va_list ap)
  107 {
  108         int ret;
  109         unsigned int len;
  110         char *printf_buffer = NULL, *path_buffer = NULL;
  111 
  112 #define PRINTF_BUFFER_SIZE 4096
  113         printf_buffer = malloc(PRINTF_BUFFER_SIZE,M_XENBUS, M_WAITOK);
  114 
  115         len = sprintf(printf_buffer, "%i ", err);
  116         ret = vsnprintf(printf_buffer+len, PRINTF_BUFFER_SIZE-len, fmt, ap);
  117 
  118         KASSERT(len + ret <= PRINTF_BUFFER_SIZE-1, ("xenbus error message too big"));
  119         device_printf(dev, "Error %s\n", printf_buffer);
  120         path_buffer = error_path(dev);
  121 
  122         if (path_buffer == NULL) {
  123                 printf("xenbus: failed to write error node for %s (%s)\n",
  124                        xenbus_get_node(dev), printf_buffer);
  125                 goto fail;
  126         }
  127 
  128         if (xs_write(XST_NIL, path_buffer, "error", printf_buffer) != 0) {
  129                 printf("xenbus: failed to write error node for %s (%s)\n",
  130                        xenbus_get_node(dev), printf_buffer);
  131                 goto fail;
  132         }
  133 
  134  fail:
  135         if (printf_buffer)
  136                 free(printf_buffer,M_XENBUS);
  137         if (path_buffer)
  138                 free(path_buffer,M_XENBUS);
  139 }
  140 
  141 void
  142 xenbus_dev_error(device_t dev, int err, const char *fmt, ...)
  143 {
  144         va_list ap;
  145 
  146         va_start(ap, fmt);
  147         xenbus_dev_verror(dev, err, fmt, ap);
  148         va_end(ap);
  149 }
  150 
  151 void
  152 xenbus_dev_vfatal(device_t dev, int err, const char *fmt, va_list ap)
  153 {
  154         xenbus_dev_verror(dev, err, fmt, ap);
  155         device_printf(dev, "Fatal error. Transitioning to Closing State\n");
  156         xenbus_set_state(dev, XenbusStateClosing);
  157 }
  158 
  159 void
  160 xenbus_dev_fatal(device_t dev, int err, const char *fmt, ...)
  161 {
  162         va_list ap;
  163 
  164         va_start(ap, fmt);
  165         xenbus_dev_vfatal(dev, err, fmt, ap);
  166         va_end(ap);
  167 }
  168 
  169 int
  170 xenbus_grant_ring(device_t dev, unsigned long ring_mfn, grant_ref_t *refp)
  171 {
  172         int error;
  173 
  174         error = gnttab_grant_foreign_access(
  175                 xenbus_get_otherend_id(dev), ring_mfn, 0, refp);
  176         if (error) {
  177                 xenbus_dev_fatal(dev, error, "granting access to ring page");
  178                 return (error);
  179         }
  180 
  181         return (0);
  182 }
  183 
  184 XenbusState
  185 xenbus_read_driver_state(const char *path)
  186 {
  187         XenbusState result;
  188         int error;
  189 
  190         error = xs_gather(XST_NIL, path, "state", "%d", &result, NULL);
  191         if (error)
  192                 result = XenbusStateClosed;
  193 
  194         return (result);
  195 }
  196 
  197 int
  198 xenbus_dev_is_online(device_t dev)
  199 {
  200         const char *path;
  201         int error;
  202         int value;
  203 
  204         path = xenbus_get_node(dev);
  205         error = xs_gather(XST_NIL, path, "online", "%d", &value, NULL);
  206         if (error != 0) {
  207                 /* Default to not online. */
  208                 value = 0;
  209         }
  210 
  211         return (value);
  212 }
  213 
  214 void
  215 xenbus_localend_changed(device_t dev, const char *path)
  216 {
  217 }

Cache object: 606a5dc7aa33e01a2e3717663b726e82


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