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("1.1.3.0-k");
117MODULE_LICENSE("GPL v2");
118