diff options
Diffstat (limited to 'arch/i386/xen/events.c')
| -rw-r--r-- | arch/i386/xen/events.c | 80 |
1 files changed, 79 insertions, 1 deletions
diff --git a/arch/i386/xen/events.c b/arch/i386/xen/events.c index e7c5d00ab4fe..4103b8bf22fd 100644 --- a/arch/i386/xen/events.c +++ b/arch/i386/xen/events.c @@ -47,6 +47,9 @@ static DEFINE_SPINLOCK(irq_mapping_update_lock); /* IRQ <-> VIRQ mapping. */ static DEFINE_PER_CPU(int, virq_to_irq[NR_VIRQS]) = {[0 ... NR_VIRQS-1] = -1}; +/* IRQ <-> IPI mapping */ +static DEFINE_PER_CPU(int, ipi_to_irq[XEN_NR_IPIS]) = {[0 ... XEN_NR_IPIS-1] = -1}; + /* Packed IRQ information: binding type, sub-type index, and event channel. */ struct packed_irq { @@ -58,7 +61,13 @@ struct packed_irq static struct packed_irq irq_info[NR_IRQS]; /* Binding types. */ -enum { IRQT_UNBOUND, IRQT_PIRQ, IRQT_VIRQ, IRQT_IPI, IRQT_EVTCHN }; +enum { + IRQT_UNBOUND, + IRQT_PIRQ, + IRQT_VIRQ, + IRQT_IPI, + IRQT_EVTCHN +}; /* Convenient shorthand for packed representation of an unbound IRQ. */ #define IRQ_UNBOUND mk_irq_info(IRQT_UNBOUND, 0, 0) @@ -261,6 +270,45 @@ static int bind_evtchn_to_irq(unsigned int evtchn) return irq; } +static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) +{ + struct evtchn_bind_ipi bind_ipi; + int evtchn, irq; + + spin_lock(&irq_mapping_update_lock); + + irq = per_cpu(ipi_to_irq, cpu)[ipi]; + if (irq == -1) { + irq = find_unbound_irq(); + if (irq < 0) + goto out; + + dynamic_irq_init(irq); + set_irq_chip_and_handler_name(irq, &xen_dynamic_chip, + handle_level_irq, "ipi"); + + bind_ipi.vcpu = cpu; + if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, + &bind_ipi) != 0) + BUG(); + evtchn = bind_ipi.port; + + evtchn_to_irq[evtchn] = irq; + irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn); + + per_cpu(ipi_to_irq, cpu)[ipi] = irq; + + bind_evtchn_to_cpu(evtchn, cpu); + } + + irq_bindcount[irq]++; + + out: + spin_unlock(&irq_mapping_update_lock); + return irq; +} + + static int bind_virq_to_irq(unsigned int virq, unsigned int cpu) { struct evtchn_bind_virq bind_virq; @@ -369,6 +417,28 @@ int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu, } EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler); +int bind_ipi_to_irqhandler(enum ipi_vector ipi, + unsigned int cpu, + irq_handler_t handler, + unsigned long irqflags, + const char *devname, + void *dev_id) +{ + int irq, retval; + + irq = bind_ipi_to_irq(ipi, cpu); + if (irq < 0) + return irq; + + retval = request_irq(irq, handler, irqflags, devname, dev_id); + if (retval != 0) { + unbind_from_irq(irq); + return retval; + } + + return irq; +} + void unbind_from_irqhandler(unsigned int irq, void *dev_id) { free_irq(irq, dev_id); @@ -376,6 +446,14 @@ void unbind_from_irqhandler(unsigned int irq, void *dev_id) } EXPORT_SYMBOL_GPL(unbind_from_irqhandler); +void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector) +{ + int irq = per_cpu(ipi_to_irq, cpu)[vector]; + BUG_ON(irq < 0); + notify_remote_via_irq(irq); +} + + /* * Search the CPUs pending events bitmasks. For each one found, map * the event number to an irq, and feed it into do_IRQ() for |