BUG about Hisilicon PMU

[John Garry]

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?

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?

Thanks,
John