BUG about Hisilicon PMU

[Zhengyuan Liu]

On Mon, Jan 11, 2021 at 5:34 PM Shaokun Zhang
<zhangshaokun at hisilicon.com> wrote:
>
> Hi John/Zhengyuan,
>
> 在 2021/1/11 17:13, John Garry 写道:
> > On 11/01/2021 08:25, Zhengyuan Liu wrote:
> >> Hi, all
> >>
> >> When boot v5.11-rc2 on my Kunpeng 920 PC, the kernel will block at PMU
> >> initialization stage, and after binary-search with bisect I found that
> >> this problem was introduced by commit ac4511c9364c ("drivers/perf:
> >> hisi: Add identifier sysfs file"),
> >> and to be more accurate it actually blocked at following position:
> >>
> >>      hisi_hha_pmu_init_data():
> >>           hha_pmu->identifier = readl(hha_pmu->base + HHA_VERSION);
> >>
> >> If you guys had already know this problem, please ignore this message.
> >
> > Do you have a dmesg? I don't see anything to block here, only crash.
> > Does v5.11-rc1 boot ok?
> >

V5.11-rc1 has included this patch, therefore also bad.

The dmesg does not have any error message, It only blocked which seems
the cpu doesn't work,
and I can hear the rotation rate of fans increasing rapidly.

I also built the PMU from Y to M, it has the same phenomenon when the
module is loaded.

> > It works fine on my D06CS (which includes Kunpeng 920) with rc3:
> >
> > john at debian:~$ more /sys/bus/event_source/devices/hisi_sccl5_hha7/identifier
> > 0x00000000
> > john at debian:~$ uname -a
> > Linux debian 5.11.0-rc3-dirty #139 SMP PREEMPT Mon Jan 11 08:42:26 GMT 2021 aarch64 GNU/Linux
> > john at debian:~$
> >
> > @Shaokun, Do you know what could be the problem on PC?
>
> I doubt the UEFI which maybe give more HHA numbers than PC has or give the wrong
> mmap address space that may cause this issue.
> So please can you tell more information about the UEFI?

Did you mean DSDT or Bios Information?

>
> Shaokun,
>
> >
> > Thanks,
> > John
> > .