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/xenbusb_front.c

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    1 /******************************************************************************
    2  * Talks to Xen Store to figure out what devices we have.
    3  *
    4  * Copyright (C) 2009, 2010 Spectra Logic Corporation
    5  * Copyright (C) 2008 Doug Rabson
    6  * Copyright (C) 2005 Rusty Russell, IBM Corporation
    7  * Copyright (C) 2005 Mike Wray, Hewlett-Packard
    8  * Copyright (C) 2005 XenSource Ltd
    9  * 
   10  * This file may be distributed separately from the Linux kernel, or
   11  * incorporated into other software packages, subject to the following license:
   12  * 
   13  * Permission is hereby granted, free of charge, to any person obtaining a copy
   14  * of this source file (the "Software"), to deal in the Software without
   15  * restriction, including without limitation the rights to use, copy, modify,
   16  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
   17  * and to permit persons to whom the Software is furnished to do so, subject to
   18  * the following conditions:
   19  * 
   20  * The above copyright notice and this permission notice shall be included in
   21  * all copies or substantial portions of the Software.
   22  * 
   23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   26  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   27  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   28  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   29  * IN THE SOFTWARE.
   30  */
   31 
   32 /**
   33  * \file xenbusb_front.c
   34  *
   35  * XenBus management of the NewBus bus containing the frontend instances of
   36  * Xen split devices.
   37  */
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: stable/12/sys/xen/xenbus/xenbusb_front.c 255040 2013-08-29 19:52:18Z gibbs $");
   40 
   41 #include <sys/param.h>
   42 #include <sys/bus.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/module.h>
   47 #include <sys/sbuf.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/syslog.h>
   50 #include <sys/systm.h>
   51 #include <sys/sx.h>
   52 #include <sys/taskqueue.h>
   53 
   54 #include <machine/stdarg.h>
   55 
   56 #include <xen/xen-os.h>
   57 #include <xen/gnttab.h>
   58 #include <xen/xenbus/xenbusvar.h>
   59 #include <xen/xenbus/xenbusb.h>
   60 
   61 
   62 /*------------------ Private Device Attachment Functions  --------------------*/
   63 /**
   64  * \brief Probe for the existance of the XenBus front bus.
   65  *
   66  * \param dev  NewBus device_t for this XenBus front bus instance.
   67  *
   68  * \return  Always returns 0 indicating success.
   69  */
   70 static int 
   71 xenbusb_front_probe(device_t dev)
   72 {
   73         device_set_desc(dev, "Xen Frontend Devices");
   74 
   75         return (0);
   76 }
   77 
   78 /**
   79  * \brief Attach the XenBus front bus.
   80  *
   81  * \param dev  NewBus device_t for this XenBus front bus instance.
   82  *
   83  * \return  On success, 0. Otherwise an errno value indicating the
   84  *          type of failure.
   85  */
   86 static int
   87 xenbusb_front_attach(device_t dev)
   88 {
   89         return (xenbusb_attach(dev, "device", /*id_components*/1));
   90 }
   91 
   92 /**
   93  * \brief Enumerate all devices of the given type on this bus.
   94  *
   95  * \param dev   NewBus device_t for this XenBus front bus instance.
   96  * \param type  String indicating the device sub-tree (e.g. "vfb", "vif")
   97  *              to enumerate. 
   98  *
   99  * \return  On success, 0. Otherwise an errno value indicating the
  100  *          type of failure.
  101  *
  102  * Devices that are found are entered into the NewBus hierarchy via
  103  * xenbusb_add_device().  xenbusb_add_device() ignores duplicate detects
  104  * and ignores duplicate devices, so it can be called unconditionally
  105  * for any device found in the XenStore.
  106  */
  107 static int
  108 xenbusb_front_enumerate_type(device_t dev, const char *type)
  109 {
  110         struct xenbusb_softc *xbs;
  111         const char **dir;
  112         unsigned int i, count;
  113         int error;
  114 
  115         xbs = device_get_softc(dev);
  116         error = xs_directory(XST_NIL, xbs->xbs_node, type, &count, &dir);
  117         if (error)
  118                 return (error);
  119         for (i = 0; i < count; i++)
  120                 xenbusb_add_device(dev, type, dir[i]);
  121 
  122         free(dir, M_XENSTORE);
  123 
  124         return (0);
  125 }
  126 
  127 /**
  128  * \brief Determine and store the XenStore path for the other end of
  129  *        a split device whose local end is represented by ivars.
  130  *
  131  * If successful, the xd_otherend_path field of the child's instance
  132  * variables will be updated.
  133  *
  134  * \param dev    NewBus device_t for this XenBus front bus instance.
  135  * \param ivars  Instance variables from the XenBus child device for
  136  *               which to perform this function.
  137  *
  138  * \return  On success, 0. Otherwise an errno value indicating the
  139  *          type of failure.
  140  */
  141 static int
  142 xenbusb_front_get_otherend_node(device_t dev, struct xenbus_device_ivars *ivars)
  143 {
  144         char *otherend_path;
  145         int error;
  146 
  147         if (ivars->xd_otherend_path != NULL) {
  148                 free(ivars->xd_otherend_path, M_XENBUS);
  149                 ivars->xd_otherend_path = NULL;
  150         }
  151                 
  152         error = xs_gather(XST_NIL, ivars->xd_node,
  153             "backend-id", "%i", &ivars->xd_otherend_id,
  154             "backend", NULL, &otherend_path,
  155             NULL);
  156 
  157         if (error == 0) {
  158                 ivars->xd_otherend_path = strdup(otherend_path, M_XENBUS);
  159                 ivars->xd_otherend_path_len = strlen(otherend_path);
  160                 free(otherend_path, M_XENSTORE);
  161         }
  162         return (error);
  163 }
  164 
  165 /*-------------------- Private Device Attachment Data  -----------------------*/
  166 static device_method_t xenbusb_front_methods[] = { 
  167         /* Device interface */ 
  168         DEVMETHOD(device_identify,      xenbusb_identify),
  169         DEVMETHOD(device_probe,         xenbusb_front_probe), 
  170         DEVMETHOD(device_attach,        xenbusb_front_attach), 
  171         DEVMETHOD(device_detach,        bus_generic_detach), 
  172         DEVMETHOD(device_shutdown,      bus_generic_shutdown), 
  173         DEVMETHOD(device_suspend,       bus_generic_suspend), 
  174         DEVMETHOD(device_resume,        xenbusb_resume), 
  175  
  176         /* Bus Interface */ 
  177         DEVMETHOD(bus_print_child,      xenbusb_print_child),
  178         DEVMETHOD(bus_read_ivar,        xenbusb_read_ivar), 
  179         DEVMETHOD(bus_write_ivar,       xenbusb_write_ivar), 
  180         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
  181         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  182         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  183         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  184  
  185         /* XenBus Bus Interface */
  186         DEVMETHOD(xenbusb_enumerate_type, xenbusb_front_enumerate_type),
  187         DEVMETHOD(xenbusb_get_otherend_node, xenbusb_front_get_otherend_node),
  188         { 0, 0 } 
  189 }; 
  190 
  191 DEFINE_CLASS_0(xenbusb_front, xenbusb_front_driver, xenbusb_front_methods,
  192                sizeof(struct xenbusb_softc));
  193 devclass_t xenbusb_front_devclass; 
  194  
  195 DRIVER_MODULE(xenbusb_front, xenstore, xenbusb_front_driver,
  196               xenbusb_front_devclass, 0, 0);

Cache object: 598f031f34d101b9f3fcad842e8cd9cf


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