mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
b52f3ed022
A NULL token is meaningless and can only lead to unintended problems. Error on registration with a NULL token, ignore de-registrations with a NULL token. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
91 lines
3.6 KiB
C
91 lines
3.6 KiB
C
/*
|
|
* IRQ offload/bypass manager
|
|
*
|
|
* Copyright (C) 2015 Red Hat, Inc.
|
|
* Copyright (c) 2015 Linaro Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef IRQBYPASS_H
|
|
#define IRQBYPASS_H
|
|
|
|
#include <linux/list.h>
|
|
|
|
struct irq_bypass_consumer;
|
|
|
|
/*
|
|
* Theory of operation
|
|
*
|
|
* The IRQ bypass manager is a simple set of lists and callbacks that allows
|
|
* IRQ producers (ex. physical interrupt sources) to be matched to IRQ
|
|
* consumers (ex. virtualization hardware that allows IRQ bypass or offload)
|
|
* via a shared token (ex. eventfd_ctx). Producers and consumers register
|
|
* independently. When a token match is found, the optional @stop callback
|
|
* will be called for each participant. The pair will then be connected via
|
|
* the @add_* callbacks, and finally the optional @start callback will allow
|
|
* any final coordination. When either participant is unregistered, the
|
|
* process is repeated using the @del_* callbacks in place of the @add_*
|
|
* callbacks. Match tokens must be unique per producer/consumer, 1:N pairings
|
|
* are not supported.
|
|
*/
|
|
|
|
/**
|
|
* struct irq_bypass_producer - IRQ bypass producer definition
|
|
* @node: IRQ bypass manager private list management
|
|
* @token: opaque token to match between producer and consumer (non-NULL)
|
|
* @irq: Linux IRQ number for the producer device
|
|
* @add_consumer: Connect the IRQ producer to an IRQ consumer (optional)
|
|
* @del_consumer: Disconnect the IRQ producer from an IRQ consumer (optional)
|
|
* @stop: Perform any quiesce operations necessary prior to add/del (optional)
|
|
* @start: Perform any startup operations necessary after add/del (optional)
|
|
*
|
|
* The IRQ bypass producer structure represents an interrupt source for
|
|
* participation in possible host bypass, for instance an interrupt vector
|
|
* for a physical device assigned to a VM.
|
|
*/
|
|
struct irq_bypass_producer {
|
|
struct list_head node;
|
|
void *token;
|
|
int irq;
|
|
int (*add_consumer)(struct irq_bypass_producer *,
|
|
struct irq_bypass_consumer *);
|
|
void (*del_consumer)(struct irq_bypass_producer *,
|
|
struct irq_bypass_consumer *);
|
|
void (*stop)(struct irq_bypass_producer *);
|
|
void (*start)(struct irq_bypass_producer *);
|
|
};
|
|
|
|
/**
|
|
* struct irq_bypass_consumer - IRQ bypass consumer definition
|
|
* @node: IRQ bypass manager private list management
|
|
* @token: opaque token to match between producer and consumer (non-NULL)
|
|
* @add_producer: Connect the IRQ consumer to an IRQ producer
|
|
* @del_producer: Disconnect the IRQ consumer from an IRQ producer
|
|
* @stop: Perform any quiesce operations necessary prior to add/del (optional)
|
|
* @start: Perform any startup operations necessary after add/del (optional)
|
|
*
|
|
* The IRQ bypass consumer structure represents an interrupt sink for
|
|
* participation in possible host bypass, for instance a hypervisor may
|
|
* support offloads to allow bypassing the host entirely or offload
|
|
* portions of the interrupt handling to the VM.
|
|
*/
|
|
struct irq_bypass_consumer {
|
|
struct list_head node;
|
|
void *token;
|
|
int (*add_producer)(struct irq_bypass_consumer *,
|
|
struct irq_bypass_producer *);
|
|
void (*del_producer)(struct irq_bypass_consumer *,
|
|
struct irq_bypass_producer *);
|
|
void (*stop)(struct irq_bypass_consumer *);
|
|
void (*start)(struct irq_bypass_consumer *);
|
|
};
|
|
|
|
int irq_bypass_register_producer(struct irq_bypass_producer *);
|
|
void irq_bypass_unregister_producer(struct irq_bypass_producer *);
|
|
int irq_bypass_register_consumer(struct irq_bypass_consumer *);
|
|
void irq_bypass_unregister_consumer(struct irq_bypass_consumer *);
|
|
|
|
#endif /* IRQBYPASS_H */
|