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1/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
2/* Copyright (C) 2010-2016 Oracle Corporation */
3
4#ifndef __VBOXGUEST_CORE_H__
5#define __VBOXGUEST_CORE_H__
6
7#include <linux/input.h>
8#include <linux/interrupt.h>
9#include <linux/kernel.h>
10#include <linux/list.h>
11#include <linux/miscdevice.h>
12#include <linux/spinlock.h>
13#include <linux/wait.h>
14#include <linux/workqueue.h>
15#include <linux/vboxguest.h>
16#include "vmmdev.h"
17
18/*
19 * The mainline kernel version (this version) of the vboxguest module
20 * contained a bug where it defined VBGL_IOCTL_VMMDEV_REQUEST_BIG and
21 * VBGL_IOCTL_LOG using _IOC(_IOC_READ | _IOC_WRITE, 'V', ...) instead
22 * of _IO(V, ...) as the out of tree VirtualBox upstream version does.
23 *
24 * These _ALT definitions keep compatibility with the wrong defines the
25 * mainline kernel version used for a while.
26 * Note the VirtualBox userspace bits have always been built against
27 * VirtualBox upstream's headers, so this is likely not necessary. But
28 * we must never break our ABI so we keep these around to be 100% sure.
29 */
30#define VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT _IOC(_IOC_READ | _IOC_WRITE, 'V', 3, 0)
31#define VBG_IOCTL_LOG_ALT(s) _IOC(_IOC_READ | _IOC_WRITE, 'V', 9, s)
32
33struct vbg_session;
34
35/** VBox guest memory balloon. */
36struct vbg_mem_balloon {
37 /** Work handling VMMDEV_EVENT_BALLOON_CHANGE_REQUEST events */
38 struct work_struct work;
39 /** Pre-allocated vmmdev_memballoon_info req for query */
40 struct vmmdev_memballoon_info *get_req;
41 /** Pre-allocated vmmdev_memballoon_change req for inflate / deflate */
42 struct vmmdev_memballoon_change *change_req;
43 /** The current number of chunks in the balloon. */
44 u32 chunks;
45 /** The maximum number of chunks in the balloon. */
46 u32 max_chunks;
47 /**
48 * Array of pointers to page arrays. A page * array is allocated for
49 * each chunk when inflating, and freed when the deflating.
50 */
51 struct page ***pages;
52};
53
54/**
55 * Per bit usage tracker for a u32 mask.
56 *
57 * Used for optimal handling of guest properties and event filter.
58 */
59struct vbg_bit_usage_tracker {
60 /** Per bit usage counters. */
61 u32 per_bit_usage[32];
62 /** The current mask according to per_bit_usage. */
63 u32 mask;
64};
65
66/** VBox guest device (data) extension. */
67struct vbg_dev {
68 struct device *dev;
69 /** The base of the adapter I/O ports. */
70 u16 io_port;
71 /** Pointer to the mapping of the VMMDev adapter memory. */
72 struct vmmdev_memory *mmio;
73 /** Host version */
74 char host_version[64];
75 /** Host features */
76 unsigned int host_features;
77 /**
78 * Dummy page and vmap address for reserved kernel virtual-address
79 * space for the guest mappings, only used on hosts lacking vtx.
80 */
81 struct page *guest_mappings_dummy_page;
82 void *guest_mappings;
83 /** Spinlock protecting pending_events. */
84 spinlock_t event_spinlock;
85 /** Preallocated struct vmmdev_events for the IRQ handler. */
86 struct vmmdev_events *ack_events_req;
87 /** Wait-for-event list for threads waiting for multiple events. */
88 wait_queue_head_t event_wq;
89 /** Mask of pending events. */
90 u32 pending_events;
91 /** Wait-for-event list for threads waiting on HGCM async completion. */
92 wait_queue_head_t hgcm_wq;
93 /** Pre-allocated hgcm cancel2 req. for cancellation on timeout */
94 struct vmmdev_hgcm_cancel2 *cancel_req;
95 /** Mutex protecting cancel_req accesses */
96 struct mutex cancel_req_mutex;
97 /** Pre-allocated mouse-status request for the input-device handling. */
98 struct vmmdev_mouse_status *mouse_status_req;
99 /** Input device for reporting abs mouse coordinates to the guest. */
100 struct input_dev *input;
101
102 /** Memory balloon information. */
103 struct vbg_mem_balloon mem_balloon;
104
105 /** Lock for session related items in vbg_dev and vbg_session */
106 struct mutex session_mutex;
107 /** Events we won't permit anyone to filter out. */
108 u32 fixed_events;
109 /**
110 * Usage counters for the host events (excludes fixed events),
111 * Protected by session_mutex.
112 */
113 struct vbg_bit_usage_tracker event_filter_tracker;
114 /**
115 * The event filter last reported to the host (or UINT32_MAX).
116 * Protected by session_mutex.
117 */
118 u32 event_filter_host;
119
120 /**
121 * Guest capabilities which have been switched to acquire_mode.
122 */
123 u32 acquire_mode_guest_caps;
124 /**
125 * Guest capabilities acquired by vbg_acquire_session_capabilities().
126 * Only one session can acquire a capability at a time.
127 */
128 u32 acquired_guest_caps;
129 /**
130 * Usage counters for guest capabilities requested through
131 * vbg_set_session_capabilities(). Indexed by capability bit
132 * number, one count per session using a capability.
133 * Protected by session_mutex.
134 */
135 struct vbg_bit_usage_tracker set_guest_caps_tracker;
136 /**
137 * The guest capabilities last reported to the host (or UINT32_MAX).
138 * Protected by session_mutex.
139 */
140 u32 guest_caps_host;
141
142 /**
143 * Heartbeat timer which fires with interval
144 * cNsHearbeatInterval and its handler sends
145 * VMMDEVREQ_GUEST_HEARTBEAT to VMMDev.
146 */
147 struct timer_list heartbeat_timer;
148 /** Heartbeat timer interval in ms. */
149 int heartbeat_interval_ms;
150 /** Preallocated VMMDEVREQ_GUEST_HEARTBEAT request. */
151 struct vmmdev_request_header *guest_heartbeat_req;
152
153 /** "vboxguest" char-device */
154 struct miscdevice misc_device;
155 /** "vboxuser" char-device */
156 struct miscdevice misc_device_user;
157};
158
159/** The VBoxGuest per session data. */
160struct vbg_session {
161 /** Pointer to the device extension. */
162 struct vbg_dev *gdev;
163
164 /**
165 * Array containing HGCM client IDs associated with this session.
166 * These will be automatically disconnected when the session is closed.
167 * Protected by vbg_gdev.session_mutex.
168 */
169 u32 hgcm_client_ids[64];
170 /**
171 * Host events requested by the session.
172 * An event type requested in any guest session will be added to the
173 * host filter. Protected by vbg_gdev.session_mutex.
174 */
175 u32 event_filter;
176 /**
177 * Guest capabilities acquired by vbg_acquire_session_capabilities().
178 * Only one session can acquire a capability at a time.
179 */
180 u32 acquired_guest_caps;
181 /**
182 * Guest capabilities set through vbg_set_session_capabilities().
183 * A capability claimed by any guest session will be reported to the
184 * host. Protected by vbg_gdev.session_mutex.
185 */
186 u32 set_guest_caps;
187 /** VMMDEV_REQUESTOR_* flags */
188 u32 requestor;
189 /** Set on CANCEL_ALL_WAITEVENTS, protected by vbg_devevent_spinlock. */
190 bool cancel_waiters;
191};
192
193int vbg_core_init(struct vbg_dev *gdev, u32 fixed_events);
194void vbg_core_exit(struct vbg_dev *gdev);
195struct vbg_session *vbg_core_open_session(struct vbg_dev *gdev, u32 requestor);
196void vbg_core_close_session(struct vbg_session *session);
197int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data);
198int vbg_core_set_mouse_status(struct vbg_dev *gdev, u32 features);
199
200irqreturn_t vbg_core_isr(int irq, void *dev_id);
201
202void vbg_linux_mouse_event(struct vbg_dev *gdev);
203
204/* Private (non exported) functions form vboxguest_utils.c */
205void *vbg_req_alloc(size_t len, enum vmmdev_request_type req_type,
206 u32 requestor);
207void vbg_req_free(void *req, size_t len);
208int vbg_req_perform(struct vbg_dev *gdev, void *req);
209int vbg_hgcm_call32(
210 struct vbg_dev *gdev, u32 requestor, u32 client_id, u32 function,
211 u32 timeout_ms, struct vmmdev_hgcm_function_parameter32 *parm32,
212 u32 parm_count, int *vbox_status);
213
214#endif