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authorJeremy Fitzhardinge <jeremy@goop.org>2009-02-07 01:09:43 +0300
committerIngo Molnar <mingo@elte.hu>2009-02-09 14:17:30 +0300
commit792dc4f6cdacf50d3f2b93756d282fc04ee34bd5 (patch)
treec65e8bc1324e5ba62b268bcd1fbe1b4b90342ecd /drivers/xen
parenteca217b36e5d7d4377493d5cedd89105e66a5a72 (diff)
downloadlinux-792dc4f6cdacf50d3f2b93756d282fc04ee34bd5.tar.xz
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 <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 7c3705479ea1..2c8d710713f5 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -30,6 +30,7 @@
#include <asm/ptrace.h>
#include <asm/irq.h>
+#include <asm/idle.h>
#include <asm/sync_bitops.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
@@ -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);
}
}