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Subject[GIT PULL] x86/apic changes for v2.6.40
Linus,

Please pull the latest x86-apic-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-apic-for-linus

Thanks,

Ingo

------------------>
Youquan Song (1):
x86, apic: Print verbose error interrupt reason on apic=debug


arch/x86/kernel/apic/apic.c | 41 ++++++++++++++++++++++++++---------------
1 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index fabf01e..ae14712 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1812,30 +1812,41 @@ void smp_spurious_interrupt(struct pt_regs *regs)
*/
void smp_error_interrupt(struct pt_regs *regs)
{
- u32 v, v1;
+ u32 v0, v1;
+ u32 i = 0;
+ static const char * const error_interrupt_reason[] = {
+ "Send CS error", /* APIC Error Bit 0 */
+ "Receive CS error", /* APIC Error Bit 1 */
+ "Send accept error", /* APIC Error Bit 2 */
+ "Receive accept error", /* APIC Error Bit 3 */
+ "Redirectable IPI", /* APIC Error Bit 4 */
+ "Send illegal vector", /* APIC Error Bit 5 */
+ "Received illegal vector", /* APIC Error Bit 6 */
+ "Illegal register address", /* APIC Error Bit 7 */
+ };

exit_idle();
irq_enter();
/* First tickle the hardware, only then report what went on. -- REW */
- v = apic_read(APIC_ESR);
+ v0 = apic_read(APIC_ESR);
apic_write(APIC_ESR, 0);
v1 = apic_read(APIC_ESR);
ack_APIC_irq();
atomic_inc(&irq_err_count);

- /*
- * Here is what the APIC error bits mean:
- * 0: Send CS error
- * 1: Receive CS error
- * 2: Send accept error
- * 3: Receive accept error
- * 4: Reserved
- * 5: Send illegal vector
- * 6: Received illegal vector
- * 7: Illegal register address
- */
- pr_debug("APIC error on CPU%d: %02x(%02x)\n",
- smp_processor_id(), v , v1);
+ apic_printk(APIC_DEBUG, KERN_DEBUG "APIC error on CPU%d: %02x(%02x)",
+ smp_processor_id(), v0 , v1);
+
+ v1 = v1 & 0xff;
+ while (v1) {
+ if (v1 & 0x1)
+ apic_printk(APIC_DEBUG, KERN_CONT " : %s", error_interrupt_reason[i]);
+ i++;
+ v1 >>= 1;
+ };
+
+ apic_printk(APIC_DEBUG, KERN_CONT "\n");
+
irq_exit();
}


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