Re: BUG about Hisilicon PMU
From: John Garry <hidden>
Date: 2021-01-11 09:17:50
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@debian:~$ more /sys/bus/event_source/devices/hisi_sccl5_hha7/identifier 0x00000000 john@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@debian:~$ @Shaokun, Do you know what could be the problem on PC? Thanks, John _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel