[rfc 2/3] powerpc/mce: Extract physical_address for UE errors

[Balbir Singh]

On Thu, Sep 7, 2017 at 8:56 AM, Benjamin Herrenschmidt <benh at au1.ibm.com> wrote:
> On Tue, 2017-09-05 at 14:15 +1000, Balbir Singh wrote:
>>  void save_mce_event(struct pt_regs *regs, long handled,
>>                     struct mce_error_info *mce_err,
>> -                   uint64_t nip, uint64_t addr)
>> +                   uint64_t nip, uint64_t addr, uint64_t phys_addr)
>>  {
>>         int index = __this_cpu_inc_return(mce_nest_count) - 1;
>>         struct machine_check_event *mce = this_cpu_ptr(&mce_event[index]);
>> @@ -140,6 +140,10 @@ void save_mce_event(struct pt_regs *regs, long handled,
>>         } else if (mce->error_type == MCE_ERROR_TYPE_UE) {
>>                 mce->u.ue_error.effective_address_provided = true;
>>                 mce->u.ue_error.effective_address = addr;
>> +               if (phys_addr != ULONG_MAX) {
>> +                       mce->u.ue_error.physical_address_provided = true;
>> +                       mce->u.ue_error.physical_address = phys_addr;
>> +               }
>>         }
>>         return;
>
> Where is "addr" coming from ? Keep in mind that on P9 at least, a UE
> will *not* give you an EA in DAR in most cases.

The EA is derived in mce_handle_derror() via page table walk and
analyse_instr(), its the best
we can do FWIK

Balbir Singh.