Release 4.7 drivers/staging/unisys/include/visorbus.h
/* 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 <linux/module.h>
#include <linux/poll.h>
#include <linux/kernel.h>
#include <linux/uuid.h>
#include "periodic_work.h"
#include "channel.h"
struct visor_driver;
struct visor_device;
extern struct bus_type visorbus_type;
typedef void (*visorbus_state_complete_func) (struct visor_device *dev,
int status);
struct visorchipset_state {
u32 created:1;
u32 attached:1;
u32 configured:1;
u32 running:1;
/* Add new fields above. */
/* Remaining bits in this 32-bit word are unused. */
};
/** This struct describes a specific Supervisor channel, by providing its
* GUID, name, and sizes.
*/
struct visor_channeltype_descriptor {
const uuid_le guid;
const char *name;
};
/**
* struct visor_driver - Information provided by each visor driver when it
* registers with the visorbus driver.
* @name: Name of the visor driver.
* @version: The numbered version of the driver (x.x.xxx).
* @vertag: A human readable version string.
* @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.
* @version_attr: Private version field. For use by bus driver only.
*/
struct visor_driver {
const char *name;
const char *version;
const char *vertag;
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;
struct driver_attribute version_attr;
};
#define to_visor_driver(x) ((x) ? \
(container_of(x, struct visor_driver, driver)) : (NULL))
/**
* 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.
* periodic_work: Device work queue. Private use by bus driver
* only.
* 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 handling
* channel events.
* 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_uuid: 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;
uuid_le channel_type_guid;
/* These fields are for private use by the bus driver only. */
struct device device;
struct list_head list_all;
struct periodic_work *periodic_work;
bool being_removed;
struct semaphore visordriver_callback_lock;
bool pausing;
bool resuming;
u32 chipset_bus_no;
u32 chipset_dev_no;
struct visorchipset_state state;
uuid_le inst;
u8 *name;
struct controlvm_message_header *pending_msg_hdr;
void *vbus_hdr_info;
uuid_le partition_uuid;
};
#define to_visor_device(x) container_of(x, struct visor_device, device)
#ifndef STANDALONE_CLIENT
int visorbus_register_visor_driver(struct visor_driver *);
void visorbus_unregister_visor_driver(struct visor_driver *);
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_clear_channel(struct visor_device *dev,
unsigned long offset, u8 ch, unsigned long nbytes);
void visorbus_enable_channel_interrupts(struct visor_device *dev);
void visorbus_disable_channel_interrupts(struct visor_device *dev);
#endif
/* Note that for visorchannel_create()
* <channel_bytes> and <guid> arguments may be 0 if we are a channel CLIENT.
* In this case, the values can simply be read from the channel header.
*/
struct visorchannel *visorchannel_create(u64 physaddr,
unsigned long channel_bytes,
gfp_t gfp, uuid_le guid);
struct visorchannel *visorchannel_create_with_lock(u64 physaddr,
unsigned long channel_bytes,
gfp_t gfp, uuid_le guid);
void visorchannel_destroy(struct visorchannel *channel);
int visorchannel_read(struct visorchannel *channel, ulong offset,
void *local, ulong nbytes);
int visorchannel_write(struct visorchannel *channel, ulong offset,
void *local, ulong nbytes);
int visorchannel_clear(struct visorchannel *channel, ulong offset,
u8 ch, ulong nbytes);
bool visorchannel_signalremove(struct visorchannel *channel, u32 queue,
void *msg);
bool visorchannel_signalinsert(struct visorchannel *channel, u32 queue,
void *msg);
bool visorchannel_signalempty(struct visorchannel *channel, u32 queue);
int visorchannel_signalqueue_slots_avail(struct visorchannel *channel,
u32 queue);
int visorchannel_signalqueue_max_slots(struct visorchannel *channel, u32 queue);
u64 visorchannel_get_physaddr(struct visorchannel *channel);
ulong visorchannel_get_nbytes(struct visorchannel *channel);
char *visorchannel_id(struct visorchannel *channel, char *s);
char *visorchannel_zoneid(struct visorchannel *channel, char *s);
u64 visorchannel_get_clientpartition(struct visorchannel *channel);
int visorchannel_set_clientpartition(struct visorchannel *channel,
u64 partition_handle);
uuid_le visorchannel_get_uuid(struct visorchannel *channel);
char *visorchannel_uuid_id(uuid_le *guid, char *s);
void visorchannel_debug(struct visorchannel *channel, int num_queues,
struct seq_file *seq, u32 off);
void __iomem *visorchannel_get_header(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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