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xen: evtchn: Allow shared registration of IRQ handers

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Currently the handling of events is supported either in the kernel or
userspace, but not both.

In order to support fast delivery of interrupts from the guest to the
backend, we need to handle the Queue notify part of Virtio protocol in
kernel and the rest in userspace.

Update the interrupt handler registration flag to IRQF_SHARED for event
channels, which would allow multiple entities to bind their interrupt
handler for the same event channel port.

Also increment the reference count of irq_info when multiple entities
try to bind event channel to irqchip, so the unbinding happens only
after all the users are gone.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/99b1edfd3147c6b5d22a5139dab5861e767dc34a.1697439990.git.viresh.kumar@linaro.org
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Viresh Kumar 2023-10-16 12:41:26 +05:30 committed by Juergen Gross
parent 767e33ca47
commit 9e90e58c11
2 changed files with 3 additions and 2 deletions
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3
drivers/xen/events/events_base.c
View file

@ -1229,7 +1229,8 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
bind_evtchn_to_cpu(evtchn, 0, false);
} else {
struct irq_info *info = info_for_irq(irq);
WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
if (!WARN_ON(!info || info->type != IRQT_EVTCHN))
info->refcnt++;
}
out:

2
drivers/xen/evtchn.c
View file

@ -397,7 +397,7 @@ static int evtchn_bind_to_user(struct per_user_data *u, evtchn_port_t port,
if (rc < 0)
goto err;
rc = bind_evtchn_to_irqhandler_lateeoi(port, evtchn_interrupt, 0,
rc = bind_evtchn_to_irqhandler_lateeoi(port, evtchn_interrupt, IRQF_SHARED,
u->name, evtchn);
if (rc < 0)
goto err;