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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. [v2: Rebased on top tip/irq/core] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -33,6 +33,7 @@
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#include <asm/ptrace.h>
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#include <asm/irq.h>
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#include <asm/idle.h>
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#include <asm/io_apic.h>
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#include <asm/sync_bitops.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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@ -46,9 +47,6 @@
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#include <xen/interface/hvm/hvm_op.h>
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#include <xen/interface/hvm/params.h>
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/* Leave low irqs free for identity mapping */
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#define LEGACY_IRQS 16
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/*
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* This lock protects updates to the following mapping and reference-count
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* arrays. The lock does not need to be acquired to read the mapping tables.
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@ -351,6 +349,17 @@ static void unmask_evtchn(int port)
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put_cpu();
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}
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static int get_nr_hw_irqs(void)
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{
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int ret = 1;
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#ifdef CONFIG_X86_IO_APIC
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ret = get_nr_irqs_gsi();
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#endif
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return ret;
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}
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static int find_unbound_irq(void)
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{
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struct irq_data *data;
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@ -382,8 +391,8 @@ static int find_unbound_irq(void)
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static bool identity_mapped_irq(unsigned irq)
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{
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/* only identity map legacy irqs */
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return irq < LEGACY_IRQS;
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/* identity map all the hardware irqs */
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return irq < get_nr_hw_irqs();
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}
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static void pirq_unmask_notify(int irq)
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@ -552,6 +561,7 @@ int xen_allocate_pirq(unsigned gsi)
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if (identity_mapped_irq(gsi)) {
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irq = gsi;
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irq_to_desc_alloc_node(irq, 0);
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dynamic_irq_init(irq);
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} else
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irq = find_unbound_irq();
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