[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 06/18] xen/apic: identity map gsi->irqs
From: Jeremy Fitzhardinge <jeremy@f9-builder.(none)> Impact: preserve compat with native Reserve the lower irq range for use for hardware interrupts so we can identity-map them. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx> --- drivers/xen/events.c | 23 +++++++++++++++++------ 1 files changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/xen/events.c b/drivers/xen/events.c index a917ebe..193cee4 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -31,6 +31,7 @@ #include <asm/ptrace.h> #include <asm/irq.h> #include <asm/idle.h> +#include <asm/io_apic.h> #include <asm/sync_bitops.h> #include <asm/xen/hypercall.h> #include <asm/xen/hypervisor.h> @@ -40,9 +41,6 @@ #include <xen/interface/xen.h> #include <xen/interface/event_channel.h> -/* Leave low irqs free for identity mapping */ -#define LEGACY_IRQS 16 - /* * This lock protects updates to the following mapping and reference-count * arrays. The lock does not need to be acquired to read the mapping tables. @@ -344,12 +342,24 @@ static void unmask_evtchn(int port) put_cpu(); } +static int get_nr_hw_irqs(void) +{ + int ret = 1; + +#ifdef CONFIG_X86_IO_APIC + ret = get_nr_irqs_gsi(); +#endif + + return ret; +} + static int find_unbound_irq(void) { int irq; struct irq_desc *desc; + int start = get_nr_hw_irqs(); - for (irq = LEGACY_IRQS; irq < nr_irqs; irq++) + for (irq = start; irq < nr_irqs; irq++) if (irq_info[irq].type == IRQT_UNBOUND) break; @@ -367,8 +377,8 @@ static int find_unbound_irq(void) static bool identity_mapped_irq(unsigned irq) { - /* only identity map legacy irqs */ - return irq < LEGACY_IRQS; + /* identity map all the hardware irqs */ + return irq < get_nr_hw_irqs(); } static void pirq_unmask_notify(int irq) @@ -537,6 +547,7 @@ int xen_allocate_pirq(unsigned gsi) if (identity_mapped_irq(gsi)) { irq = gsi; + irq_to_desc_alloc_cpu(irq, 0); dynamic_irq_init(irq); } else irq = find_unbound_irq(); -- 1.6.0.6 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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