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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2010-10-18 10:41:08 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2010-10-18 10:41:08 -0400
commit0794bfc74365d0de4b1d4920cb71031850551cbd (patch)
treee8c48f4a0b36e89a9d2d9c0a2fc9e58dd6103335
parent7b586d71858091f0958e5808b7e3d5390c2ae47d (diff)
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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>
-rw-r--r--drivers/xen/events.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index bc69a9d92ab..1bb51e459ab 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.
@@ -351,6 +349,17 @@ 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)
{
struct irq_data *data;
@@ -382,8 +391,8 @@ 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)
@@ -552,6 +561,7 @@ 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();