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| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-08-20 18:57:53 -0700 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-08-24 11:13:28 -0700 |
| commit | aaca49642b92c8a57d3ca5029a5a94019c7af69f (patch) | |
| tree | a86a88c11addd689a2903d21f1bb948f461c1a1d | |
| parent | 76be97c1fc945db08aae1f1b746012662d643e97 (diff) | |
| download | linux-aaca49642b92c8a57d3ca5029a5a94019c7af69f.tar.gz | |
xen: use percpu interrupts for IPIs and VIRQs
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> Cc: Stable Kernel <stable@kernel.org>
| -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 72f91bff29c7..0923ccb26121 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -112,6 +112,7 @@ 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) @@ -403,8 +404,8 @@ 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, @@ -444,8 +445,8 @@ 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); @@ -964,6 +965,16 @@ static struct irq_chip xen_dynamic_chip __read_mostly = { .retrigger = retrigger_dynirq, }; +static struct irq_chip xen_percpu_chip __read_mostly = { + .name = "xen-percpu", + + .disable = disable_dynirq, + .mask = disable_dynirq, + .unmask = enable_dynirq, + + .ack = ack_dynirq, +}; + int xen_set_callback_via(uint64_t via) { struct xen_hvm_param a; |