forked from mirrors/linux
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>
90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
/*
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* IRQ offload/bypass manager
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*
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* Copyright (C) 2015 Red Hat, Inc.
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* Copyright (c) 2015 Linaro Ltd.
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef IRQBYPASS_H
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#define IRQBYPASS_H
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#include <linux/list.h>
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struct irq_bypass_consumer;
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/*
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* Theory of operation
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*
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* The IRQ bypass manager is a simple set of lists and callbacks that allows
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* IRQ producers (ex. physical interrupt sources) to be matched to IRQ
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* consumers (ex. virtualization hardware that allows IRQ bypass or offload)
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* via a shared token (ex. eventfd_ctx). Producers and consumers register
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* independently. When a token match is found, the optional @stop callback
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* will be called for each participant. The pair will then be connected via
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* the @add_* callbacks, and finally the optional @start callback will allow
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* any final coordination. When either participant is unregistered, the
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* process is repeated using the @del_* callbacks in place of the @add_*
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* callbacks. Match tokens must be unique per producer/consumer, 1:N pairings
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* are not supported.
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*/
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/**
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* struct irq_bypass_producer - IRQ bypass producer definition
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* @node: IRQ bypass manager private list management
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* @token: opaque token to match between producer and consumer (non-NULL)
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* @irq: Linux IRQ number for the producer device
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* @add_consumer: Connect the IRQ producer to an IRQ consumer (optional)
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* @del_consumer: Disconnect the IRQ producer from an IRQ consumer (optional)
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* @stop: Perform any quiesce operations necessary prior to add/del (optional)
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* @start: Perform any startup operations necessary after add/del (optional)
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*
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* The IRQ bypass producer structure represents an interrupt source for
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* participation in possible host bypass, for instance an interrupt vector
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* for a physical device assigned to a VM.
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*/
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struct irq_bypass_producer {
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struct list_head node;
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void *token;
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int irq;
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int (*add_consumer)(struct irq_bypass_producer *,
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struct irq_bypass_consumer *);
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void (*del_consumer)(struct irq_bypass_producer *,
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struct irq_bypass_consumer *);
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void (*stop)(struct irq_bypass_producer *);
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void (*start)(struct irq_bypass_producer *);
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};
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/**
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* struct irq_bypass_consumer - IRQ bypass consumer definition
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* @node: IRQ bypass manager private list management
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* @token: opaque token to match between producer and consumer (non-NULL)
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* @add_producer: Connect the IRQ consumer to an IRQ producer
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* @del_producer: Disconnect the IRQ consumer from an IRQ producer
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* @stop: Perform any quiesce operations necessary prior to add/del (optional)
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* @start: Perform any startup operations necessary after add/del (optional)
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*
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* The IRQ bypass consumer structure represents an interrupt sink for
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* participation in possible host bypass, for instance a hypervisor may
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* support offloads to allow bypassing the host entirely or offload
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* portions of the interrupt handling to the VM.
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*/
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struct irq_bypass_consumer {
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struct list_head node;
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void *token;
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int (*add_producer)(struct irq_bypass_consumer *,
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struct irq_bypass_producer *);
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void (*del_producer)(struct irq_bypass_consumer *,
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struct irq_bypass_producer *);
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void (*stop)(struct irq_bypass_consumer *);
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void (*start)(struct irq_bypass_consumer *);
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};
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int irq_bypass_register_producer(struct irq_bypass_producer *);
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void irq_bypass_unregister_producer(struct irq_bypass_producer *);
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int irq_bypass_register_consumer(struct irq_bypass_consumer *);
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void irq_bypass_unregister_consumer(struct irq_bypass_consumer *);
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#endif /* IRQBYPASS_H */
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