[PATCH V2 0/3] fix cpu softlock when using T-HEAD c9xx pmu

[Anup Patel]

Hi Guo,

On Tue, Aug 15, 2023 at 3:09 PM Inochi Amaoto <inochiama at outlook.com> wrote:
>
> These patches fix the system hang issue caused by using perf tool on
> T-HEAD c9xx related platforms.
>
> These patch solves two issues for T-HEAD c9xx pmu:
> When detecting features of PMU, MHPMCOUNTER3 is written to all 1s. This
> will cause an unexpected overflow interrupt before starting the PMU in
> T-HEAD cores.
>
> Another thing is the T-HEAD c9xx pmu is not a standart pmu, especially
> in interrupt process and access delegation. For interrupt process, the
> T-HEAD pmu uses MCOUNTERINTEN and MCOUNTEROF to control and identify the
> interrupt. For access delegation. It needs to set MCOUNTERWEN to allow
> S-mode to access related CSRs.
>
> Changed from V1:
> 1. fix the hang issue when using perf with high profile frequency.
> 2. optimze the performance of irq process of T-HEAD c9xx pmu.
>
> Inochi Amaoto (3):
>   lib: sbi_pmu: ensure update hpm counter before starting counting
>   platform: generic: allwinner: fix OF process for T-HEAD c9xx pmu
>   lib: sbi_pmu: keep overflow interrupt of stopped hpm counter disabled

I intend to merge this series by end-of-week.

Please let me know if you want to hold-off merging this.

Regards,
Anup

>
>  lib/sbi/sbi_pmu.c                      | 17 +++++++++++------
>  platform/generic/allwinner/sun20i-d1.c | 25 +++++++++++++++----------
>  2 files changed, 26 insertions(+), 16 deletions(-)
>
> --
> 2.41.0
>
>
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