mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 01:34:00 +08:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
3.5 KiB
C
88 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* IRQ offload/bypass manager
|
|
*
|
|
* Copyright (C) 2015 Red Hat, Inc.
|
|
* Copyright (c) 2015 Linaro Ltd.
|
|
*/
|
|
#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 */
|