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[PATCH] Remove MPS table APIC renumbering 

The MPS table specification says that the operating system should
renumber the IO-APICs following the table as needed.  However in
ACPI this is not allowed or neeeded and all x86-64 systems are ACPI
compliant.

The code was already disabled on some systems because it caused
problems there. Remove it completely now.

CC: mdomsch@dell.com

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:30 +02:00 committed by Andi Kleen
parent 606bd58de6
commit edd9652296
1 changed files with 0 additions and 71 deletions
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71
arch/x86_64/kernel/io_apic.c
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@ -1282,72 +1282,6 @@ void disable_IO_APIC(void)
disconnect_bsp_APIC(ioapic_i8259.pin != -1);
}
/*
* function to set the IO-APIC physical IDs based on the
* values stored in the MPC table.
*
* by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
*/
static void __init setup_ioapic_ids_from_mpc (void)
{
union IO_APIC_reg_00 reg_00;
int apic;
int i;
unsigned char old_id;
unsigned long flags;
/*
* Set the IOAPIC ID to the value stored in the MPC table.
*/
for (apic = 0; apic < nr_ioapics; apic++) {
/* Read the register 0 value */
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic, 0);
spin_unlock_irqrestore(&ioapic_lock, flags);
old_id = mp_ioapics[apic].mpc_apicid;
printk(KERN_INFO "Using IO-APIC %d\n", mp_ioapics[apic].mpc_apicid);
/*
* We need to adjust the IRQ routing table
* if the ID changed.
*/
if (old_id != mp_ioapics[apic].mpc_apicid)
for (i = 0; i < mp_irq_entries; i++)
if (mp_irqs[i].mpc_dstapic == old_id)
mp_irqs[i].mpc_dstapic
= mp_ioapics[apic].mpc_apicid;
/*
* Read the right value from the MPC table and
* write it into the ID register.
*/
apic_printk(APIC_VERBOSE,KERN_INFO "...changing IO-APIC physical APIC ID to %d ...",
mp_ioapics[apic].mpc_apicid);
reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0, reg_00.raw);
spin_unlock_irqrestore(&ioapic_lock, flags);
/*
* Sanity check
*/
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic, 0);
spin_unlock_irqrestore(&ioapic_lock, flags);
if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
printk("could not set ID!\n");
else
apic_printk(APIC_VERBOSE," ok.\n");
}
}
/*
* There is a nasty bug in some older SMP boards, their mptable lies
* about the timer IRQ. We do the following to work around the situation:
@ -1863,11 +1797,6 @@ void __init setup_IO_APIC(void)
apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
/*
* Set up the IO-APIC IRQ routing table.
*/
if (!acpi_ioapic)
setup_ioapic_ids_from_mpc();
sync_Arb_IDs();
setup_IO_APIC_irqs();
init_IO_APIC_traps();