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x86: add mp_find_ioapic_pin 

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>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-09 12:05:47 -08:00
parent 4924e228ae
commit c3e137d1e8
2 changed files with 14 additions and 3 deletions
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1
arch/x86/include/asm/mpspec.h
View File

@ -78,6 +78,7 @@ extern int acpi_probe_gsi(void);
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,

16
arch/x86/kernel/acpi/boot.c
View File

@ -887,6 +887,16 @@ int mp_find_ioapic(int gsi)
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
@ -1022,7 +1032,7 @@ void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
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
@ -1142,7 +1152,7 @@ int mp_register_gsi(u32 gsi, int triggering, int polarity)
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)
@ -1231,7 +1241,7 @@ int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
ioapic = mp_find_ioapic(gsi);
mp_irq.dstapic = mp_ioapic_routing[ioapic].apic_id;
mp_irq.dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
save_mp_irq(&mp_irq);
#endif