[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 05/22] xen: identity map gsi->irqs
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> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@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 b8f030a..8eeb808 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -33,6 +33,7 @@ #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> @@ -46,9 +47,6 @@ #include <xen/interface/hvm/hvm_op.h> #include <xen/interface/hvm/params.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. @@ -351,12 +349,24 @@ 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 = 0; irq < nr_irqs; irq++) { + for (irq = start; irq < nr_irqs; irq++) { desc = irq_to_desc(irq); /* only 0->15 have init'd desc; handle irq > 16 */ if (desc == NULL) @@ -383,8 +393,8 @@ 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) @@ -553,6 +563,7 @@ int xen_allocate_pirq(unsigned gsi) if (identity_mapped_irq(gsi)) { irq = gsi; + irq_to_desc_alloc_node(irq, 0); dynamic_irq_init(irq); } else irq = find_unbound_irq(); -- 1.7.0.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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