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Diffstat (limited to 'arch/x86/kernel/apic/apic.c')
-rw-r--r--arch/x86/kernel/apic/apic.c41
1 files changed, 33 insertions, 8 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index e5a4a1e01618..c02cc692985c 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -51,6 +51,7 @@
#include <asm/smp.h>
#include <asm/mce.h>
#include <asm/kvm_para.h>
+#include <asm/tsc.h>
unsigned int num_processors;
@@ -1151,8 +1152,13 @@ static void __cpuinit lapic_setup_esr(void)
*/
void __cpuinit setup_local_APIC(void)
{
- unsigned int value;
- int i, j;
+ unsigned int value, queued;
+ int i, j, acked = 0;
+ unsigned long long tsc = 0, ntsc;
+ long long max_loops = cpu_khz;
+
+ if (cpu_has_tsc)
+ rdtscll(tsc);
if (disable_apic) {
arch_disable_smp_support();
@@ -1204,13 +1210,32 @@ void __cpuinit setup_local_APIC(void)
* the interrupt. Hence a vector might get locked. It was noticed
* for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
*/
- for (i = APIC_ISR_NR - 1; i >= 0; i--) {
- value = apic_read(APIC_ISR + i*0x10);
- for (j = 31; j >= 0; j--) {
- if (value & (1<<j))
- ack_APIC_irq();
+ do {
+ queued = 0;
+ for (i = APIC_ISR_NR - 1; i >= 0; i--)
+ queued |= apic_read(APIC_IRR + i*0x10);
+
+ for (i = APIC_ISR_NR - 1; i >= 0; i--) {
+ value = apic_read(APIC_ISR + i*0x10);
+ for (j = 31; j >= 0; j--) {
+ if (value & (1<<j)) {
+ ack_APIC_irq();
+ acked++;
+ }
+ }
}
- }
+ if (acked > 256) {
+ printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n",
+ acked);
+ break;
+ }
+ if (cpu_has_tsc) {
+ rdtscll(ntsc);
+ max_loops = (cpu_khz << 10) - (ntsc - tsc);
+ } else
+ max_loops--;
+ } while (queued && max_loops > 0);
+ WARN_ON(max_loops <= 0);
/*
* Now that we are all set up, enable the APIC