2010-09-22 16:14:45 +00:00
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From aaca49642b92c8a57d3ca5029a5a94019c7af69f Mon Sep 17 00:00:00 2001
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Date: Fri, 20 Aug 2010 18:57:53 -0700
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Subject: xen: use percpu interrupts for IPIs and VIRQs
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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commit aaca49642b92c8a57d3ca5029a5a94019c7af69f upstream.
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IPIs and VIRQs are inherently per-cpu event types, so treat them as such:
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- use a specific percpu irq_chip implementation, and
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- handle them with handle_percpu_irq
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This makes the path for delivering these interrupts more efficient
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(no masking/unmasking, no locks), and it avoid problems with attempts
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to migrate them.
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Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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---
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drivers/xen/events.c | 19 +++++++++++++++----
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1 file changed, 15 insertions(+), 4 deletions(-)
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--- a/drivers/xen/events.c
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+++ b/drivers/xen/events.c
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@@ -107,6 +107,7 @@ static inline unsigned long *cpu_evtchn_
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#define VALID_EVTCHN(chn) ((chn) != 0)
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static struct irq_chip xen_dynamic_chip;
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+static struct irq_chip xen_percpu_chip;
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/* Constructor for packed IRQ information. */
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static struct irq_info mk_unbound_info(void)
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@@ -389,8 +390,8 @@ static int bind_ipi_to_irq(unsigned int
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if (irq < 0)
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goto out;
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- set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
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- handle_level_irq, "ipi");
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+ set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
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+ handle_percpu_irq, "ipi");
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bind_ipi.vcpu = cpu;
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if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
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@@ -430,8 +431,8 @@ static int bind_virq_to_irq(unsigned int
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irq = find_unbound_irq();
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- set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
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- handle_level_irq, "virq");
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+ set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
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+ handle_percpu_irq, "virq");
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evtchn_to_irq[evtchn] = irq;
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irq_info[irq] = mk_virq_info(evtchn, virq);
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@@ -934,6 +935,16 @@ static struct irq_chip xen_dynamic_chip
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.retrigger = retrigger_dynirq,
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};
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2010-09-24 16:45:35 +00:00
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+static struct irq_chip xen_percpu_chip __read_mostly = {
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2010-09-22 16:14:45 +00:00
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+ .name = "xen-percpu",
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+
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+ .disable = disable_dynirq,
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+ .mask = disable_dynirq,
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+ .unmask = enable_dynirq,
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+
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+ .ack = ack_dynirq,
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+};
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+
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void __init xen_init_IRQ(void)
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{
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int i;
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