Re: [PATCH v4 2/2] apic: Add print error interrupt reason
From: Cyrill Gorcunov
Date: Thu Apr 14 2011 - 03:57:43 EST
heh, drop my prev mail. Patch is good! thanks ans sorry for noise.
On Thursday, April 14, 2011, Cyrill Gorcunov <gorcunov@xxxxxxxxx> wrote:
> On Thu, Apr 14, 2011 at 10:36 AM, Youquan Song <youquan.song@xxxxxxxxx> wrote:
>> End user worry about the error interrupt information and intend to know what
>> kind of error interrupts are generated, so this patch add printing out the
>> detail debug information of error interrupt.
>> dynamic debug is not initiated when LAPIC initiation, so the pr_debug will not
>> output the error interrupt debug information when boot.
>> In this patch, we use apic_printk(APIC_DEBUG,), so if add kernel option
>> apic=debug will output the error interrupt during boot.
>>
>> Signed-off-by: Youquan Song <youquan.song@xxxxxxxxx>
>> Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
>> ---
>> arch/x86/kernel/apic/apic.c | 38 +++++++++++++++++++++++++-------------
>> 1 files changed, 25 insertions(+), 13 deletions(-)
>>
>> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
>> index fabf01e..3ddf4ef 100644
>> --- a/arch/x86/kernel/apic/apic.c
>> +++ b/arch/x86/kernel/apic/apic.c
>> @@ -1813,6 +1813,17 @@ void smp_spurious_interrupt(struct pt_regs *regs)
>> void smp_error_interrupt(struct pt_regs *regs)
>> {
>> u32 v, 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 */
>> + };
>>
> ...
>> - 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(), v , v1);
>> +
>> + v1 = v1 & 0xff;
>> + while (v1) {
>> + if (v1 & 0x1)
>> + apic_printk(APIC_DEBUG, KERN_CONT " : %s",
>> + error_interrupt_reason[i]);
>> + i++;
>> + v1 >>= 1;
>> + };
>> +
>
> Hi looks good but please add some array-checking in case if we get
> some damaged result
> from hardware, ie check for i not being out of error_interrupt_reason. Thanks!
>
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