From 792dc4f6cdacf50d3f2b93756d282fc04ee34bd5 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Fri, 6 Feb 2009 14:09:43 -0800 Subject: [PATCH] xen: use our own eventchannel->irq path Rather than overloading vectors for event channels, take full responsibility for mapping an event channel to irq directly. With this patch Xen has its own irq allocator. When the kernel gets an event channel upcall, it maps the event channel number to an irq and injects it into the normal interrupt path. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar --- arch/x86/include/asm/xen/events.h | 6 ------ arch/x86/xen/irq.c | 17 +---------------- drivers/xen/events.c | 22 ++++++++++++++++++++-- 3 files changed, 21 insertions(+), 24 deletions(-) diff --git a/arch/x86/include/asm/xen/events.h b/arch/x86/include/asm/xen/events.h index 19144184983..1df35417c41 100644 --- a/arch/x86/include/asm/xen/events.h +++ b/arch/x86/include/asm/xen/events.h @@ -15,10 +15,4 @@ static inline int xen_irqs_disabled(struct pt_regs *regs) return raw_irqs_disabled_flags(regs->flags); } -static inline void xen_do_IRQ(int irq, struct pt_regs *regs) -{ - regs->orig_ax = ~irq; - do_IRQ(regs); -} - #endif /* _ASM_X86_XEN_EVENTS_H */ diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c index 5a070900ad3..cfd17799bd6 100644 --- a/arch/x86/xen/irq.c +++ b/arch/x86/xen/irq.c @@ -19,21 +19,6 @@ void xen_force_evtchn_callback(void) (void)HYPERVISOR_xen_version(0, NULL); } -static void __init __xen_init_IRQ(void) -{ - int i; - - /* Create identity vector->irq map */ - for(i = 0; i < NR_VECTORS; i++) { - int cpu; - - for_each_possible_cpu(cpu) - per_cpu(vector_irq, cpu)[i] = i; - } - - xen_init_IRQ(); -} - static unsigned long xen_save_fl(void) { struct vcpu_info *vcpu; @@ -127,7 +112,7 @@ static void xen_halt(void) } static const struct pv_irq_ops xen_irq_ops __initdata = { - .init_IRQ = __xen_init_IRQ, + .init_IRQ = xen_init_IRQ, .save_fl = PV_CALLEE_SAVE(xen_save_fl), .restore_fl = PV_CALLEE_SAVE(xen_restore_fl), diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 7c3705479ea..2c8d710713f 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -30,6 +30,7 @@ #include #include +#include #include #include #include @@ -517,6 +518,24 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id) } +static void xen_do_irq(unsigned irq, struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + if (WARN_ON(irq == -1)) + return; + + exit_idle(); + irq_enter(); + + //printk("cpu %d handling irq %d\n", smp_processor_id(), info->irq); + handle_irq(irq, regs); + + irq_exit(); + + set_irq_regs(old_regs); +} + /* * Search the CPUs pending events bitmasks. For each one found, map * the event number to an irq, and feed it into do_IRQ() for @@ -557,8 +576,7 @@ void xen_evtchn_do_upcall(struct pt_regs *regs) int port = (word_idx * BITS_PER_LONG) + bit_idx; int irq = evtchn_to_irq[port]; - if (irq != -1) - xen_do_IRQ(irq, regs); + xen_do_irq(irq, regs); } } -- 2.20.1