diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-07-09 00:07:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-16 11:03:16 +0200 |
| commit | 0725cbb97793d4e65bf148e4872959cdbb8c6ddd (patch) | |
| tree | 884cf1e23cbff9021058e855acb98b90e3f31b86 /arch/x86/xen | |
| parent | xen64: register callbacks in arch-independent way (diff) | |
| download | linux-0725cbb97793d4e65bf148e4872959cdbb8c6ddd.tar.xz linux-0725cbb97793d4e65bf148e4872959cdbb8c6ddd.zip | |
xen64: add identity irq->vector map
The x86_64 interrupt subsystem is oriented towards vectors, as opposed
to a flat irq space as it is in x86-32. This patch adds a simple
identity irq->vector mapping so that we can continue to feed irqs into
do_IRQ() and get a good result.
Ideally x86_32 will unify with the 64-bit code and use vectors too.
At that point we can move to mapping event channels to vectors, which
will allow us to economise on irqs (so per-cpu event channels can
share irqs, rather than having to allocte one per cpu, for example).
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 8b60982e457a..52f2292672c4 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1085,8 +1085,25 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = { }, }; +static void __init __xen_init_IRQ(void) +{ +#ifdef CONFIG_X86_64 + 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; + } +#endif /* CONFIG_X86_64 */ + + xen_init_IRQ(); +} + static const struct pv_irq_ops xen_irq_ops __initdata = { - .init_IRQ = xen_init_IRQ, + .init_IRQ = __xen_init_IRQ, .save_fl = xen_save_fl, .restore_fl = xen_restore_fl, .irq_disable = xen_irq_disable, |