LXR linux/drivers/misc/vmw_vmci/vmci

   1/*
   2 * VMware VMCI Driver
   3 *
   4 * Copyright (C) 2012 VMware, Inc. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the
   8 * Free Software Foundation version 2 and no later version.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13 * for more details.
  14 */
  15
  16#include <linux/vmw_vmci_defs.h>
  17#include <linux/vmw_vmci_api.h>
  18#include <linux/atomic.h>
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/init.h>
  22
  23#include "vmci_driver.h"
  24#include "vmci_event.h"
  25
  26static bool vmci_disable_host;
  27module_param_named(disable_host, vmci_disable_host, bool, 0);
  28MODULE_PARM_DESC(disable_host,
  29                 "Disable driver host personality (default=enabled)");
  30
  31static bool vmci_disable_guest;
  32module_param_named(disable_guest, vmci_disable_guest, bool, 0);
  33MODULE_PARM_DESC(disable_guest,
  34                 "Disable driver guest personality (default=enabled)");
  35
  36static bool vmci_guest_personality_initialized;
  37static bool vmci_host_personality_initialized;
  38
  39/*
  40 * vmci_get_context_id() - Gets the current context ID.
  41 *
  42 * Returns the current context ID.  Note that since this is accessed only
  43 * from code running in the host, this always returns the host context ID.
  44 */
  45u32 vmci_get_context_id(void)
  46{
  47        if (vmci_guest_code_active())
  48                return vmci_get_vm_context_id();
  49        else if (vmci_host_code_active())
  50                return VMCI_HOST_CONTEXT_ID;
  51
  52        return VMCI_INVALID_ID;
  53}
  54EXPORT_SYMBOL_GPL(vmci_get_context_id);
  55
  56static int __init vmci_drv_init(void)
  57{
  58        int vmci_err;
  59        int error;
  60
  61        vmci_err = vmci_event_init();
  62        if (vmci_err < VMCI_SUCCESS) {
  63                pr_err("Failed to initialize VMCIEvent (result=%d)\n",
  64                       vmci_err);
  65                return -EINVAL;
  66        }
  67
  68        if (!vmci_disable_guest) {
  69                error = vmci_guest_init();
  70                if (error) {
  71                        pr_warn("Failed to initialize guest personality (err=%d)\n",
  72                                error);
  73                } else {
  74                        vmci_guest_personality_initialized = true;
  75                        pr_info("Guest personality initialized and is %s\n",
  76                                vmci_guest_code_active() ?
  77                                "active" : "inactive");
  78                }
  79        }
  80
  81        if (!vmci_disable_host) {
  82                error = vmci_host_init();
  83                if (error) {
  84                        pr_warn("Unable to initialize host personality (err=%d)\n",
  85                                error);
  86                } else {
  87                        vmci_host_personality_initialized = true;
  88                        pr_info("Initialized host personality\n");
  89                }
  90        }
  91
  92        if (!vmci_guest_personality_initialized &&
  93            !vmci_host_personality_initialized) {
  94                vmci_event_exit();
  95                return -ENODEV;
  96        }
  97
  98        return 0;
  99}
 100module_init(vmci_drv_init);
 101
 102static void __exit vmci_drv_exit(void)
 103{
 104        if (vmci_guest_personality_initialized)
 105                vmci_guest_exit();
 106
 107        if (vmci_host_personality_initialized)
 108                vmci_host_exit();
 109
 110        vmci_event_exit();
 111}
 112module_exit(vmci_drv_exit);
 113
 114MODULE_AUTHOR("VMware, Inc.");
 115MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
 116MODULE_VERSION("1.1.5.0-k");
 117MODULE_LICENSE("GPL v2");
 118