mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.5 KiB
87 lines
3.5 KiB
/* 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 */
|
|
|