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Subject答复: [PATCH v2 1/4] x86/mce: Add Zhaoxin M CE support
Date
On Tue, Sep 10, 2019, Borislav Petkov wrote:
>On Tue, Sep 10, 2019 at 08:19:08AM +0000, Tony W Wang-oc wrote:
>> All Zhaoxin newer CPUs support MCE that compatible with Intel's
>> "Machine-Check Architecture", so add support for Zhaoxin MCE in
>> mce/core.c.
>>
>> Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
>> ---
>> arch/x86/kernel/cpu/mce/core.c | 30 ++++++++++++++++++++++++------
>> 1 file changed, 24 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
>> index 743370e..3f878f6 100644
>> --- a/arch/x86/kernel/cpu/mce/core.c
>> +++ b/arch/x86/kernel/cpu/mce/core.c
>> @@ -488,8 +488,9 @@ int mce_usable_address(struct mce *m)
>> if (!(m->status & MCI_STATUS_ADDRV))
>> return 0;
>>
>> - /* Checks after this one are Intel-specific: */
>> - if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
>> + /* Checks after this one are Intel/Zhaoxin-specific: */
>> + if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL &&
>> + boot_cpu_data.x86_vendor != X86_VENDOR_ZHAOXIN)
>> return 1;
>>
>> if (!(m->status & MCI_STATUS_MISCV))
>> @@ -510,7 +511,8 @@ bool mce_is_memory_error(struct mce *m)
>> if (m->cpuvendor == X86_VENDOR_AMD ||
>> m->cpuvendor == X86_VENDOR_HYGON) {
>> return amd_mce_is_memory_error(m);
>> - } else if (m->cpuvendor == X86_VENDOR_INTEL) {
>> + } else if (m->cpuvendor == X86_VENDOR_INTEL ||
>> + m->cpuvendor == X86_VENDOR_ZHAOXIN) {
>> /*
>> * Intel SDM Volume 3B - 15.9.2 Compound Error Codes
>> *
>
>Make that a switch-case for better readability pls.

Ok.

>
>> @@ -1697,6 +1699,21 @@ static int __mcheck_cpu_apply_quirks(struct
>cpuinfo_x86 *c)
>> if (c->x86 == 6 && c->x86_model == 45)
>> quirk_no_way_out = quirk_sandybridge_ifu;
>> }
>> +
>> + if (c->x86_vendor == X86_VENDOR_ZHAOXIN) {
>> + /*
>> + * All newer Zhaoxin CPUs support MCE broadcasting. Enable
>> + * synchronization with a one second timeout.
>> + */
>> + if ((c->x86 == 6 && c->x86_model == 0x19 &&
>> + (c->x86_stepping > 3 && c->x86_stepping < 8)) ||
>> + (c->x86 == 6 && c->x86_model == 0x1f) ||
>> + c->x86 > 6) {
>
>Can this be simplified into maybe something like this:
>
> if (c->x86 > 6 || (c->x86_model == 0x19 || c->x86_model == 0x1f))
>
>this is, of course, assuming that Zhaoxin doesn't do family < 6 and that
>the other steppings for model 0x19 don't matter because they don't exist
>or so...
>

Yes, Zhaoxin doesn't do family<6, and the other steppings for model 0x19
doesn't have MCA. So will simplified like this:
if (c->x86 > 6 || (c->x86_model == 0x19 || c->x86_model == 0x1f))

Sincerely
TonyWWang-oc

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