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![David Kershner](/assets/img/avatar_default.png)
Add error handling to visorbus_enable_channel_interrupt. Signed-off-by: David Kershner <david.kershner@unisys.com> Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
215 lines
7.9 KiB
C
215 lines
7.9 KiB
C
/* visorbus.h
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*
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* Copyright (C) 2010 - 2013 UNISYS CORPORATION
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*/
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/*
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* This header file is to be included by other kernel mode components that
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* implement a particular kind of visor_device. Each of these other kernel
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* mode components is called a visor device driver. Refer to visortemplate
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* for a minimal sample visor device driver.
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*
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* There should be nothing in this file that is private to the visorbus
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* bus implementation itself.
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*
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*/
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#ifndef __VISORBUS_H__
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#define __VISORBUS_H__
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/poll.h>
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#include <linux/kernel.h>
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#include <linux/uuid.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include "channel.h"
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struct visor_driver;
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struct visor_device;
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extern struct bus_type visorbus_type;
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typedef void (*visorbus_state_complete_func) (struct visor_device *dev,
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int status);
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struct visorchipset_state {
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u32 created:1;
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u32 attached:1;
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u32 configured:1;
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u32 running:1;
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/* Add new fields above. */
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/* Remaining bits in this 32-bit word are unused. */
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};
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/** This struct describes a specific Supervisor channel, by providing its
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* GUID, name, and sizes.
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*/
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struct visor_channeltype_descriptor {
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const uuid_le guid;
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const char *name;
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};
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/**
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* struct visor_driver - Information provided by each visor driver when it
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* registers with the visorbus driver.
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* @name: Name of the visor driver.
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* @owner: The module owner.
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* @channel_types: Types of channels handled by this driver, ending with
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* a zero GUID. Our specialized BUS.match() method knows
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* about this list, and uses it to determine whether this
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* driver will in fact handle a new device that it has
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* detected.
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* @probe: Called when a new device comes online, by our probe()
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* function specified by driver.probe() (triggered
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* ultimately by some call to driver_register(),
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* bus_add_driver(), or driver_attach()).
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* @remove: Called when a new device is removed, by our remove()
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* function specified by driver.remove() (triggered
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* ultimately by some call to device_release_driver()).
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* @channel_interrupt: Called periodically, whenever there is a possiblity
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* that "something interesting" may have happened to the
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* channel.
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* @pause: Called to initiate a change of the device's state. If
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* the return valu`e is < 0, there was an error and the
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* state transition will NOT occur. If the return value
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* is >= 0, then the state transition was INITIATED
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* successfully, and complete_func() will be called (or
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* was just called) with the final status when either the
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* state transition fails or completes successfully.
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* @resume: Behaves similar to pause.
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* @driver: Private reference to the device driver. For use by bus
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* driver only.
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*/
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struct visor_driver {
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const char *name;
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struct module *owner;
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struct visor_channeltype_descriptor *channel_types;
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int (*probe)(struct visor_device *dev);
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void (*remove)(struct visor_device *dev);
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void (*channel_interrupt)(struct visor_device *dev);
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int (*pause)(struct visor_device *dev,
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visorbus_state_complete_func complete_func);
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int (*resume)(struct visor_device *dev,
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visorbus_state_complete_func complete_func);
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/* These fields are for private use by the bus driver only. */
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struct device_driver driver;
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};
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#define to_visor_driver(x) ((x) ? \
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(container_of(x, struct visor_driver, driver)) : (NULL))
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/**
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* struct visor_device - A device type for things "plugged" into the visorbus
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* bus
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* @visorchannel: Points to the channel that the device is
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* associated with.
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* @channel_type_guid: Identifies the channel type to the bus driver.
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* @device: Device struct meant for use by the bus driver
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* only.
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* @list_all: Used by the bus driver to enumerate devices.
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* @timer: Timer fired periodically to do interrupt-type
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* activity.
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* @being_removed: Indicates that the device is being removed from
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* the bus. Private bus driver use only.
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* @visordriver_callback_lock: Used by the bus driver to lock when handling
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* channel events.
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* @pausing: Indicates that a change towards a paused state.
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* is in progress. Only modified by the bus driver.
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* @resuming: Indicates that a change towards a running state
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* is in progress. Only modified by the bus driver.
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* @chipset_bus_no: Private field used by the bus driver.
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* @chipset_dev_no: Private field used the bus driver.
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* @state: Used to indicate the current state of the
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* device.
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* @inst: Unique GUID for this instance of the device.
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* @name: Name of the device.
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* @pending_msg_hdr: For private use by bus driver to respond to
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* hypervisor requests.
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* @vbus_hdr_info: A pointer to header info. Private use by bus
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* driver.
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* @partition_uuid: Indicates client partion id. This should be the
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* same across all visor_devices in the current
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* guest. Private use by bus driver only.
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*/
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struct visor_device {
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struct visorchannel *visorchannel;
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uuid_le channel_type_guid;
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/* These fields are for private use by the bus driver only. */
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struct device device;
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struct list_head list_all;
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struct timer_list timer;
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bool timer_active;
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bool being_removed;
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struct mutex visordriver_callback_lock;
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bool pausing;
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bool resuming;
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u32 chipset_bus_no;
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u32 chipset_dev_no;
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struct visorchipset_state state;
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uuid_le inst;
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u8 *name;
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struct controlvm_message_header *pending_msg_hdr;
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void *vbus_hdr_info;
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uuid_le partition_uuid;
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struct dentry *debugfs_dir;
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struct dentry *debugfs_client_bus_info;
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};
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#define to_visor_device(x) container_of(x, struct visor_device, device)
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int visorbus_register_visor_driver(struct visor_driver *drv);
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void visorbus_unregister_visor_driver(struct visor_driver *drv);
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int visorbus_read_channel(struct visor_device *dev,
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unsigned long offset, void *dest,
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unsigned long nbytes);
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int visorbus_write_channel(struct visor_device *dev,
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unsigned long offset, void *src,
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unsigned long nbytes);
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int visorbus_enable_channel_interrupts(struct visor_device *dev);
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void visorbus_disable_channel_interrupts(struct visor_device *dev);
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/* Levels of severity for diagnostic events, in order from lowest severity to
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* highest (i.e. fatal errors are the most severe, and should always be logged,
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* but info events rarely need to be logged except during debugging). The
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* values DIAG_SEVERITY_ENUM_BEGIN and DIAG_SEVERITY_ENUM_END are not valid
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* severity values. They exist merely to dilineate the list, so that future
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* additions won't require changes to the driver (i.e. when checking for
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* out-of-range severities in SetSeverity). The values DIAG_SEVERITY_OVERRIDE
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* and DIAG_SEVERITY_SHUTOFF are not valid severity values for logging events
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* but they are valid for controlling the amount of event data. Changes made
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* to the enum, need to be reflected in s-Par.
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*/
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enum diag_severity {
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DIAG_SEVERITY_VERBOSE = 0,
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DIAG_SEVERITY_INFO = 1,
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DIAG_SEVERITY_WARNING = 2,
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DIAG_SEVERITY_ERR = 3,
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DIAG_SEVERITY_PRINT = 4,
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};
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int visorchannel_signalremove(struct visorchannel *channel, u32 queue,
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void *msg);
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int visorchannel_signalinsert(struct visorchannel *channel, u32 queue,
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void *msg);
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bool visorchannel_signalempty(struct visorchannel *channel, u32 queue);
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uuid_le visorchannel_get_uuid(struct visorchannel *channel);
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#define BUS_ROOT_DEVICE UINT_MAX
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struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
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struct visor_device *from);
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#endif
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