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Subject[PATCH] [26/45] x86_64: clear IO_APIC before enabing apic error vector.
Date

From: Yinghai Lu <Yinghai.Lu@Sun.COM>
[PATCH] x86_64: clear IO_APIC before enabing apic error vector.

some apic id lifting system: 4 socket quad core, 8 socket quad core will do apic id lifting for BSP.

but io-apic regs for ExtINT still use 0 as dest.

so when we enable apic error vector in BSP, we will get one APIC error.

CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU 0/4 -> Node 0
CPU: Physical Processor ID: 1
CPU: Processor Core ID: 0
SMP alternatives: switching to UP code
ACPI: Core revision 20070126
enabled ExtINT on CPU#0
ESR value after enabling vector: 00000000, after 0000000c
APIC error on CPU0: 0c(08)
ENABLING IO-APIC IRQs
Synchronizing Arb IDs.

So move enable_IO_APIC from setup_IO_APIC into setup_local_APIC and call it
before enabling apic error vector.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Andi Kleen <ak@suse.de>

---
arch/x86_64/kernel/apic.c | 8 ++++++++
arch/x86_64/kernel/io_apic.c | 7 +++++--
include/asm-x86_64/hw_irq.h | 1 +
3 files changed, 14 insertions(+), 2 deletions(-)

Index: linux/arch/x86_64/kernel/apic.c
===================================================================
--- linux.orig/arch/x86_64/kernel/apic.c
+++ linux/arch/x86_64/kernel/apic.c
@@ -419,6 +419,14 @@ void __cpuinit setup_local_APIC (void)
value = APIC_DM_NMI | APIC_LVT_MASKED;
apic_write(APIC_LVT1, value);

+ /*
+ * Now enable IO-APICs, actually call clear_IO_APIC
+ * We need clear_IO_APIC before enabling vector on BP
+ */
+ if (!smp_processor_id())
+ if (!skip_ioapic_setup && nr_ioapics)
+ enable_IO_APIC();
+
{
unsigned oldvalue;
maxlvt = get_maxlvt();
Index: linux/arch/x86_64/kernel/io_apic.c
===================================================================
--- linux.orig/arch/x86_64/kernel/io_apic.c
+++ linux/arch/x86_64/kernel/io_apic.c
@@ -1166,7 +1166,7 @@ void __apicdebuginit print_PIC(void)

#endif /* 0 */

-static void __init enable_IO_APIC(void)
+void __init enable_IO_APIC(void)
{
union IO_APIC_reg_01 reg_01;
int i8259_apic, i8259_pin;
@@ -1775,7 +1775,10 @@ __setup("no_timer_check", notimercheck);

void __init setup_IO_APIC(void)
{
- enable_IO_APIC();
+
+ /*
+ * calling enable_IO_APIC() is moved to setup_local_APIC for BP
+ */

if (acpi_ioapic)
io_apic_irqs = ~0; /* all IRQs go through IOAPIC */
Index: linux/include/asm-x86_64/hw_irq.h
===================================================================
--- linux.orig/include/asm-x86_64/hw_irq.h
+++ linux/include/asm-x86_64/hw_irq.h
@@ -135,6 +135,7 @@ extern void init_8259A(int aeoi);
extern void send_IPI_self(int vector);
extern void init_VISWS_APIC_irqs(void);
extern void setup_IO_APIC(void);
+extern void enable_IO_APIC(void);
extern void disable_IO_APIC(void);
extern void print_IO_APIC(void);
extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
-
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