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Subject[PATCH 14 of 38] x86: add mp_find_ioapic_pin
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Add mp_find_ioapic_pin() to find an IO APIC's specific pin from a GSI,
and use this function within acpi/boot. Make it non-static so other
code can use it too.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/include/asm/mpspec.h | 1 +
arch/x86/kernel/acpi/boot.c | 16 +++++++++++++---
2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -64,6 +64,7 @@
extern int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
u32 gsi, int triggering, int polarity);
extern int mp_find_ioapic(int gsi);
+extern int mp_find_ioapic_pin(int ioapic, int gsi);
#else
static inline int
mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -880,6 +880,16 @@
return -1;
}

+int mp_find_ioapic_pin(int ioapic, int gsi)
+{
+ if (WARN_ON(ioapic == -1))
+ return -1;
+ if (WARN_ON(gsi > mp_ioapic_routing[ioapic].gsi_end))
+ return -1;
+
+ return gsi - mp_ioapic_routing[ioapic].gsi_base;
+}
+
static u8 __init uniq_ioapic_id(u8 id)
{
#ifdef CONFIG_X86_32
@@ -992,7 +1002,7 @@
ioapic = mp_find_ioapic(gsi);
if (ioapic < 0)
return;
- pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
+ pin = mp_find_ioapic_pin(ioapic, gsi);

/*
* TBD: This check is for faulty timer entries, where the override
@@ -1114,7 +1124,7 @@
return gsi;
}

- ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
+ ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);

#ifdef CONFIG_X86_32
if (ioapic_renumber_irq)
@@ -1203,7 +1213,7 @@
mp_irq.mp_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
ioapic = mp_find_ioapic(gsi);
mp_irq.mp_dstapic = mp_ioapic_routing[ioapic].apic_id;
- mp_irq.mp_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
+ mp_irq.mp_dstirq = mp_find_ioapic_pin(ioapic, gsi);

save_mp_irq(&mp_irq);
#endif



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