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// SPDX-License-Identifier: GPL-2.0+
* Copyright (C) 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
* This header file is to be included by other kernel mode components that
* implement a particular kind of visor_device. Each of these other kernel
* mode components is called a visor device driver. Refer to visortemplate
* for a minimal sample visor device driver.
* There should be nothing in this file that is private to the visorbus
* bus implementation itself.
#ifndef __VISORBUS_H__
#define __VISORBUS_H__
#include <linux/device.h>
#define VISOR_CHANNEL_SIGNATURE ('L' << 24 | 'N' << 16 | 'C' << 8 | 'E')
* enum channel_serverstate
* @CHANNELSRV_UNINITIALIZED: Channel is in an undefined state.
* @CHANNELSRV_READY: Channel has been initialized by server.
enum channel_serverstate {
* enum channel_clientstate
* @CHANNELCLI_DISABLED: Client can see channel but is NOT allowed to use it
* unless given TBD* explicit request
* (should actually be < DETACHED).
* @CHANNELCLI_ATTACHING: Legacy EFI client request for EFI server to attach.
* @CHANNELCLI_ATTACHED: Idle, but client may want to use channel any time.
* @CHANNELCLI_BUSY: Client either wants to use or is using channel.
* @CHANNELCLI_OWNED: "No worries" state - client can access channel
* anytime.
enum channel_clientstate {
* Values for VISOR_CHANNEL_PROTOCOL.Features: This define exists so that
* a guest can look at the FeatureFlags in the io channel, and configure the
* driver to use interrupts or not based on this setting. All feature bits for
* all channels should be defined here. The io channel feature bits are defined
* below.
* struct channel_header - Common Channel Header
* @signature: Signature.
* @legacy_state: DEPRECATED - being replaced by.
* @header_size: sizeof(struct channel_header).
* @size: Total size of this channel in bytes.
* @features: Flags to modify behavior.
* @chtype: Channel type: data, bus, control, etc..
* @partition_handle: ID of guest partition.
* @handle: Device number of this channel in client.
* @ch_space_offset: Offset in bytes to channel specific area.
* @version_id: Struct channel_header Version ID.
* @partition_index: Index of guest partition.
* @zone_uuid: Guid of Channel's zone.
* @cli_str_offset: Offset from channel header to null-terminated
* ClientString (0 if ClientString not present).
* @cli_state_boot: CHANNEL_CLIENTSTATE of pre-boot EFI client of this
* channel.
* @cmd_state_cli: CHANNEL_COMMANDSTATE (overloaded in Windows drivers, see
* ServerStateUp, ServerStateDown, etc).
* @cli_state_os: CHANNEL_CLIENTSTATE of Guest OS client of this channel.
* @ch_characteristic: CHANNEL_CHARACTERISTIC_<xxx>.
* @cmd_state_srv: CHANNEL_COMMANDSTATE (overloaded in Windows drivers, see
* ServerStateUp, ServerStateDown, etc).
* @cli_error_boot: Bits to indicate err states for boot clients, so err
* messages can be throttled.
* @cli_error_os: Bits to indicate err states for OS clients, so err
* messages can be throttled.
* @filler: Pad out to 128 byte cacheline.
* @recover_channel: Please add all new single-byte values below here.
struct channel_header {
u64 signature;
u32 legacy_state;
/* SrvState, CliStateBoot, and CliStateOS below */
u32 header_size;
u64 size;
u64 features;
guid_t chtype;
u64 partition_handle;
u64 handle;
u64 ch_space_offset;
u32 version_id;
u32 partition_index;
guid_t zone_guid;
u32 cli_str_offset;
u32 cli_state_boot;
u32 cmd_state_cli;
u32 cli_state_os;
u32 ch_characteristic;
u32 cmd_state_srv;
u32 srv_state;
u8 cli_error_boot;
u8 cli_error_os;
u8 filler[1];
u8 recover_channel;
} __packed;
* struct signal_queue_header - Subheader for the Signal Type variation of the
* Common Channel.
* @version: SIGNAL_QUEUE_HEADER Version ID.
* @chtype: Queue type: storage, network.
* @size: Total size of this queue in bytes.
* @sig_base_offset: Offset to signal queue area.
* @features: Flags to modify behavior.
* @num_sent: Total # of signals placed in this queue.
* @num_overflows: Total # of inserts failed due to full queue.
* @signal_size: Total size of a signal for this queue.
* @max_slots: Max # of slots in queue, 1 slot is always empty.
* @max_signals: Max # of signals in queue (MaxSignalSlots-1).
* @head: Queue head signal #.
* @num_received: Total # of signals removed from this queue.
* @tail: Queue tail signal.
* @reserved1: Reserved field.
* @reserved2: Reserved field.
* @client_queue:
* @num_irq_received: Total # of Interrupts received. This is incremented by the
* ISR in the guest windows driver.
* @num_empty: Number of times that visor_signal_remove is called and
* returned Empty Status.
* @errorflags: Error bits set during SignalReinit to denote trouble with
* client's fields.
* @filler: Pad out to 64 byte cacheline.
struct signal_queue_header {
/* 1st cache line */
u32 version;
u32 chtype;
u64 size;
u64 sig_base_offset;
u64 features;
u64 num_sent;
u64 num_overflows;
u32 signal_size;
u32 max_slots;
u32 max_signals;
u32 head;
/* 2nd cache line */
u64 num_received;
u32 tail;
u32 reserved1;
u64 reserved2;
u64 client_queue;
u64 num_irq_received;
u64 num_empty;
u32 errorflags;
u8 filler[12];
} __packed;
/* {414815ed-c58c-11da-95a9-00e08161165f} */
GUID_INIT(0x414815ed, 0xc58c, 0x11da, \
0x95, 0xa9, 0x0, 0xe0, 0x81, 0x61, 0x16, 0x5f)
struct visorchipset_state {
u32 created:1;
u32 attached:1;
u32 configured:1;
u32 running:1;
/* Remaining bits in this 32-bit word are reserved. */
* struct visor_device - A device type for things "plugged" into the visorbus
* bus
* @visorchannel: Points to the channel that the device is
* associated with.
* @channel_type_guid: Identifies the channel type to the bus driver.
* @device: Device struct meant for use by the bus driver
* only.
* @list_all: Used by the bus driver to enumerate devices.
* @timer: Timer fired periodically to do interrupt-type
* activity.
* @being_removed: Indicates that the device is being removed from
* the bus. Private bus driver use only.
* @visordriver_callback_lock: Used by the bus driver to lock when adding and
* removing devices.
* @pausing: Indicates that a change towards a paused state.
* is in progress. Only modified by the bus driver.
* @resuming: Indicates that a change towards a running state
* is in progress. Only modified by the bus driver.
* @chipset_bus_no: Private field used by the bus driver.
* @chipset_dev_no: Private field used the bus driver.
* @state: Used to indicate the current state of the
* device.
* @inst: Unique GUID for this instance of the device.
* @name: Name of the device.
* @pending_msg_hdr: For private use by bus driver to respond to
* hypervisor requests.
* @vbus_hdr_info: A pointer to header info. Private use by bus
* driver.
* @partition_guid: Indicates client partion id. This should be the
* same across all visor_devices in the current
* guest. Private use by bus driver only.
struct visor_device {
struct visorchannel *visorchannel;
guid_t channel_type_guid;
/* These fields are for private use by the bus driver only. */
struct device device;
struct list_head list_all;
struct timer_list timer;
bool timer_active;
bool being_removed;
struct mutex visordriver_callback_lock; /* synchronize probe/remove */
bool pausing;
bool resuming;
u32 chipset_bus_no;
u32 chipset_dev_no;
struct visorchipset_state state;
guid_t inst;
u8 *name;
struct controlvm_message_header *pending_msg_hdr;
void *vbus_hdr_info;
guid_t partition_guid;
struct dentry *debugfs_dir;
struct dentry *debugfs_bus_info;
#define to_visor_device(x) container_of(x, struct visor_device, device)
typedef void (*visorbus_state_complete_func) (struct visor_device *dev,
int status);
* This struct describes a specific visor channel, by providing its GUID, name,
* and sizes.
struct visor_channeltype_descriptor {
const guid_t guid;
const char *name;
u64 min_bytes;
u32 version;
* struct visor_driver - Information provided by each visor driver when it
* registers with the visorbus driver
* @name: Name of the visor driver.
* @owner: The module owner.
* @channel_types: Types of channels handled by this driver, ending with
* a zero GUID. Our specialized BUS.match() method knows
* about this list, and uses it to determine whether this
* driver will in fact handle a new device that it has
* detected.
* @probe: Called when a new device comes online, by our probe()
* function specified by driver.probe() (triggered
* ultimately by some call to driver_register(),
* bus_add_driver(), or driver_attach()).
* @remove: Called when a new device is removed, by our remove()
* function specified by driver.remove() (triggered
* ultimately by some call to device_release_driver()).
* @channel_interrupt: Called periodically, whenever there is a possiblity
* that "something interesting" may have happened to the
* channel.
* @pause: Called to initiate a change of the device's state. If
* the return valu`e is < 0, there was an error and the
* state transition will NOT occur. If the return value
* is >= 0, then the state transition was INITIATED
* successfully, and complete_func() will be called (or
* was just called) with the final status when either the
* state transition fails or completes successfully.
* @resume: Behaves similar to pause.
* @driver: Private reference to the device driver. For use by bus
* driver only.
struct visor_driver {
const char *name;
struct module *owner;
struct visor_channeltype_descriptor *channel_types;
int (*probe)(struct visor_device *dev);
void (*remove)(struct visor_device *dev);
void (*channel_interrupt)(struct visor_device *dev);
int (*pause)(struct visor_device *dev,
visorbus_state_complete_func complete_func);
int (*resume)(struct visor_device *dev,
visorbus_state_complete_func complete_func);
/* These fields are for private use by the bus driver only. */
struct device_driver driver;
#define to_visor_driver(x) (container_of(x, struct visor_driver, driver))
int visor_check_channel(struct channel_header *ch, struct device *dev,
const guid_t *expected_uuid, char *chname,
u64 expected_min_bytes, u32 expected_version,
u64 expected_signature);
int visorbus_register_visor_driver(struct visor_driver *drv);
void visorbus_unregister_visor_driver(struct visor_driver *drv);
int visorbus_read_channel(struct visor_device *dev,
unsigned long offset, void *dest,
unsigned long nbytes);
int visorbus_write_channel(struct visor_device *dev,
unsigned long offset, void *src,
unsigned long nbytes);
int visorbus_enable_channel_interrupts(struct visor_device *dev);
void visorbus_disable_channel_interrupts(struct visor_device *dev);
int visorchannel_signalremove(struct visorchannel *channel, u32 queue,
void *msg);
int visorchannel_signalinsert(struct visorchannel *channel, u32 queue,
void *msg);
bool visorchannel_signalempty(struct visorchannel *channel, u32 queue);
const guid_t *visorchannel_get_guid(struct visorchannel *channel);
struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
struct visor_device *from);