Release 4.15 drivers/staging/unisys/include/visorbus.h
/*
* Copyright (C) 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
/*
* 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>
#include "visorchannel.h"
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);
#define BUS_ROOT_DEVICE UINT_MAX
struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
struct visor_device *from);
#endif
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