9be07334f9
Keep a list of connected frontends. Use a semaphore to protect list accesses. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Juergen Gross <jgross@suse.com> CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
84 lines
2 KiB
C
84 lines
2 KiB
C
/*
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* (c) 2017 Stefano Stabellini <stefano@aporeto.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kthread.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <linux/module.h>
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#include <linux/semaphore.h>
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#include <linux/wait.h>
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#include <xen/events.h>
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#include <xen/grant_table.h>
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#include <xen/xen.h>
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#include <xen/xenbus.h>
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#include <xen/interface/io/pvcalls.h>
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struct pvcalls_back_global {
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struct list_head frontends;
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struct semaphore frontends_lock;
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} pvcalls_back_global;
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static int pvcalls_back_probe(struct xenbus_device *dev,
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const struct xenbus_device_id *id)
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{
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return 0;
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}
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static void pvcalls_back_changed(struct xenbus_device *dev,
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enum xenbus_state frontend_state)
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{
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}
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static int pvcalls_back_remove(struct xenbus_device *dev)
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{
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return 0;
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}
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static int pvcalls_back_uevent(struct xenbus_device *xdev,
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struct kobj_uevent_env *env)
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{
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return 0;
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}
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static const struct xenbus_device_id pvcalls_back_ids[] = {
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{ "pvcalls" },
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{ "" }
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};
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static struct xenbus_driver pvcalls_back_driver = {
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.ids = pvcalls_back_ids,
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.probe = pvcalls_back_probe,
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.remove = pvcalls_back_remove,
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.uevent = pvcalls_back_uevent,
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.otherend_changed = pvcalls_back_changed,
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};
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static int __init pvcalls_back_init(void)
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{
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int ret;
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if (!xen_domain())
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return -ENODEV;
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ret = xenbus_register_backend(&pvcalls_back_driver);
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if (ret < 0)
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return ret;
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sema_init(&pvcalls_back_global.frontends_lock, 1);
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INIT_LIST_HEAD(&pvcalls_back_global.frontends);
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return 0;
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}
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module_init(pvcalls_back_init);
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