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197dbaaa GZ |
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 | ||
26 | static bool vmci_disable_host; | |
27 | module_param_named(disable_host, vmci_disable_host, bool, 0); | |
28 | MODULE_PARM_DESC(disable_host, | |
29 | "Disable driver host personality (default=enabled)"); | |
30 | ||
31 | static bool vmci_disable_guest; | |
32 | module_param_named(disable_guest, vmci_disable_guest, bool, 0); | |
33 | MODULE_PARM_DESC(disable_guest, | |
34 | "Disable driver guest personality (default=enabled)"); | |
35 | ||
36 | static bool vmci_guest_personality_initialized; | |
37 | static 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 | */ | |
45 | u32 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 | } | |
54 | EXPORT_SYMBOL_GPL(vmci_get_context_id); | |
55 | ||
56 | static 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 | } | |
100 | module_init(vmci_drv_init); | |
101 | ||
102 | static 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 | } | |
112 | module_exit(vmci_drv_exit); | |
113 | ||
114 | MODULE_AUTHOR("VMware, Inc."); | |
115 | MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface."); | |
a35b675b | 116 | MODULE_VERSION("1.1.6.0-k"); |
197dbaaa | 117 | MODULE_LICENSE("GPL v2"); |