2 * Copyright (C) 2010 - 2013 UNISYS CORPORATION
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more
18 * This header file is to be included by other kernel mode components that
19 * implement a particular kind of visor_device. Each of these other kernel
20 * mode components is called a visor device driver. Refer to visortemplate
21 * for a minimal sample visor device driver.
23 * There should be nothing in this file that is private to the visorbus
24 * bus implementation itself.
27 #ifndef __VISORBUS_H__
28 #define __VISORBUS_H__
30 #include <linux/device.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
37 extern struct bus_type visorbus_type;
39 typedef void (*visorbus_state_complete_func) (struct visor_device *dev,
42 struct visorchipset_state {
47 /* Add new fields above. */
48 /* Remaining bits in this 32-bit word are unused. */
52 * This struct describes a specific Supervisor channel, by providing its
53 * GUID, name, and sizes.
55 struct visor_channeltype_descriptor {
61 * struct visor_driver - Information provided by each visor driver when it
62 * registers with the visorbus driver.
63 * @name: Name of the visor driver.
64 * @owner: The module owner.
65 * @channel_types: Types of channels handled by this driver, ending with
66 * a zero GUID. Our specialized BUS.match() method knows
67 * about this list, and uses it to determine whether this
68 * driver will in fact handle a new device that it has
70 * @probe: Called when a new device comes online, by our probe()
71 * function specified by driver.probe() (triggered
72 * ultimately by some call to driver_register(),
73 * bus_add_driver(), or driver_attach()).
74 * @remove: Called when a new device is removed, by our remove()
75 * function specified by driver.remove() (triggered
76 * ultimately by some call to device_release_driver()).
77 * @channel_interrupt: Called periodically, whenever there is a possiblity
78 * that "something interesting" may have happened to the
80 * @pause: Called to initiate a change of the device's state. If
81 * the return valu`e is < 0, there was an error and the
82 * state transition will NOT occur. If the return value
83 * is >= 0, then the state transition was INITIATED
84 * successfully, and complete_func() will be called (or
85 * was just called) with the final status when either the
86 * state transition fails or completes successfully.
87 * @resume: Behaves similar to pause.
88 * @driver: Private reference to the device driver. For use by bus
94 struct visor_channeltype_descriptor *channel_types;
95 int (*probe)(struct visor_device *dev);
96 void (*remove)(struct visor_device *dev);
97 void (*channel_interrupt)(struct visor_device *dev);
98 int (*pause)(struct visor_device *dev,
99 visorbus_state_complete_func complete_func);
100 int (*resume)(struct visor_device *dev,
101 visorbus_state_complete_func complete_func);
103 /* These fields are for private use by the bus driver only. */
104 struct device_driver driver;
107 #define to_visor_driver(x) (container_of(x, struct visor_driver, driver))
110 * struct visor_device - A device type for things "plugged" into the visorbus
112 * @visorchannel: Points to the channel that the device is
114 * @channel_type_guid: Identifies the channel type to the bus driver.
115 * @device: Device struct meant for use by the bus driver
117 * @list_all: Used by the bus driver to enumerate devices.
118 * @timer: Timer fired periodically to do interrupt-type
120 * @being_removed: Indicates that the device is being removed from
121 * the bus. Private bus driver use only.
122 * @visordriver_callback_lock: Used by the bus driver to lock when adding and
124 * @pausing: Indicates that a change towards a paused state.
125 * is in progress. Only modified by the bus driver.
126 * @resuming: Indicates that a change towards a running state
127 * is in progress. Only modified by the bus driver.
128 * @chipset_bus_no: Private field used by the bus driver.
129 * @chipset_dev_no: Private field used the bus driver.
130 * @state: Used to indicate the current state of the
132 * @inst: Unique GUID for this instance of the device.
133 * @name: Name of the device.
134 * @pending_msg_hdr: For private use by bus driver to respond to
135 * hypervisor requests.
136 * @vbus_hdr_info: A pointer to header info. Private use by bus
138 * @partition_guid: Indicates client partion id. This should be the
139 * same across all visor_devices in the current
140 * guest. Private use by bus driver only.
143 struct visor_device {
144 struct visorchannel *visorchannel;
145 guid_t channel_type_guid;
146 /* These fields are for private use by the bus driver only. */
147 struct device device;
148 struct list_head list_all;
149 struct timer_list timer;
152 struct mutex visordriver_callback_lock; /* synchronize probe/remove */
157 struct visorchipset_state state;
160 struct controlvm_message_header *pending_msg_hdr;
162 guid_t partition_guid;
163 struct dentry *debugfs_dir;
164 struct dentry *debugfs_client_bus_info;
167 #define to_visor_device(x) container_of(x, struct visor_device, device)
169 int visor_check_channel(struct channel_header *ch, struct device *dev,
170 const guid_t *expected_uuid, char *chname,
171 u64 expected_min_bytes, u32 expected_version,
172 u64 expected_signature);
174 int visorbus_register_visor_driver(struct visor_driver *drv);
175 void visorbus_unregister_visor_driver(struct visor_driver *drv);
176 int visorbus_read_channel(struct visor_device *dev,
177 unsigned long offset, void *dest,
178 unsigned long nbytes);
179 int visorbus_write_channel(struct visor_device *dev,
180 unsigned long offset, void *src,
181 unsigned long nbytes);
182 int visorbus_enable_channel_interrupts(struct visor_device *dev);
183 void visorbus_disable_channel_interrupts(struct visor_device *dev);
186 * Levels of severity for diagnostic events, in order from lowest severity to
187 * highest (i.e. fatal errors are the most severe, and should always be logged,
188 * but info events rarely need to be logged except during debugging). The
189 * values DIAG_SEVERITY_ENUM_BEGIN and DIAG_SEVERITY_ENUM_END are not valid
190 * severity values. They exist merely to dilineate the list, so that future
191 * additions won't require changes to the driver (i.e. when checking for
192 * out-of-range severities in SetSeverity). The values DIAG_SEVERITY_OVERRIDE
193 * and DIAG_SEVERITY_SHUTOFF are not valid severity values for logging events
194 * but they are valid for controlling the amount of event data. Changes made
195 * to the enum, need to be reflected in s-Par.
198 DIAG_SEVERITY_VERBOSE = 0,
199 DIAG_SEVERITY_INFO = 1,
200 DIAG_SEVERITY_WARNING = 2,
201 DIAG_SEVERITY_ERR = 3,
202 DIAG_SEVERITY_PRINT = 4,
205 int visorchannel_signalremove(struct visorchannel *channel, u32 queue,
207 int visorchannel_signalinsert(struct visorchannel *channel, u32 queue,
209 bool visorchannel_signalempty(struct visorchannel *channel, u32 queue);
210 const guid_t *visorchannel_get_guid(struct visorchannel *channel);
212 #define BUS_ROOT_DEVICE UINT_MAX
213 struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
214 struct visor_device *from);