diff options
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-08-20 18:57:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-20 13:17:43 -0700 |
| commit | c7b28349a66e0aa9a24872dfc55a5296fc01a360 (patch) | |
| tree | 3d9801f91dfc0e8c68671a281d09051450bc7cf2 /drivers/xen | |
| parent | c5783925493e315f91330241546da7915dcc46e3 (diff) | |
xen: use percpu interrupts for IPIs and VIRQs
commit aaca49642b92c8a57d3ca5029a5a94019c7af69f upstream.
IPIs and VIRQs are inherently per-cpu event types, so treat them as such:
- use a specific percpu irq_chip implementation, and
- handle them with handle_percpu_irq
This makes the path for delivering these interrupts more efficient
(no masking/unmasking, no locks), and it avoid problems with attempts
to migrate them.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/events.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 50cfdb02390b..a4dc7bf8fa13 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -106,6 +106,7 @@ static inline unsigned long *cpu_evtchn_mask(int cpu) #define VALID_EVTCHN(chn) ((chn) != 0) static struct irq_chip xen_dynamic_chip; +static struct irq_chip xen_percpu_chip; /* Constructor for packed IRQ information. */ static struct irq_info mk_unbound_info(void) @@ -388,8 +389,8 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) if (irq < 0) goto out; - set_irq_chip_and_handler_name(irq, &xen_dynamic_chip, - handle_level_irq, "ipi"); + set_irq_chip_and_handler_name(irq, &xen_percpu_chip, + handle_percpu_irq, "ipi"); bind_ipi.vcpu = cpu; if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, @@ -429,8 +430,8 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu) irq = find_unbound_irq(); - set_irq_chip_and_handler_name(irq, &xen_dynamic_chip, - handle_level_irq, "virq"); + set_irq_chip_and_handler_name(irq, &xen_percpu_chip, + handle_percpu_irq, "virq"); evtchn_to_irq[evtchn] = irq; irq_info[irq] = mk_virq_info(evtchn, virq); @@ -929,6 +930,16 @@ static struct irq_chip xen_dynamic_chip __read_mostly = { .retrigger = retrigger_dynirq, }; +static struct irq_chip en_percpu_chip __read_mostly = { + .name = "xen-percpu", + + .disable = disable_dynirq, + .mask = disable_dynirq, + .unmask = enable_dynirq, + + .ack = ack_dynirq, +}; + void __init xen_init_IRQ(void) { int i; |