[PATCH v3 8/8] perf vendor events riscv:: Add support for spacemit,riscv-iommu HPM aliasing

[Lv Zheng]

On 2/5/2026 1:38 AM, Conor Dooley wrote:
> On Wed, Feb 04, 2026 at 05:09:52PM +0800, Lv Zheng wrote:
>> Add JSON HPM event aliases for SpacemiT distributed IOMMU (T100) which is
>> general and compatible for all SpacemiT RISC-V SoCs.
>>
>> Signed-off-by: Lv Zheng <lv.zheng at linux.spacemit.com>
>> Signed-off-by: Jingyu Li <joey.li at spacemit.com>
>> ---
>>   MAINTAINERS                                   |   3 +
>>   .../arch/riscv/spacemit/iommu/sys/ioatc.json  |  30 ++++
>>   .../arch/riscv/spacemit/iommu/sys/ioats.json  | 163 ++++++++++++++++++
>>   3 files changed, 196 insertions(+)
>>   create mode 100644 tools/perf/pmu-events/arch/riscv/spacemit/iommu/sys/ioatc.json
>>   create mode 100644 tools/perf/pmu-events/arch/riscv/spacemit/iommu/sys/ioats.json
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 7c50701b6001..4d91f99aa742 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -22459,12 +22459,15 @@ K:	riscv
>>   
>>   RISC-V IOMMU
>>   M:	Tomasz Jeznach <tjeznach at rivosinc.com>
>> +M:	Lv Zheng <lv.zheng at linux.spacemit.com>
>> +M:	Jingyu Li <joey.li at spacemit.com>
> 
> To be frank, this looks misguided, or at least premature, to me, given the
> state of the patchset.

Should this be a big deal?
I've been working as kernel maintainers for 5 years (you can find me in 
git log using Lv Zheng <lv.zheng at intel.com>) and given the fact that I'm 
also the silicon designer of SpacemiT T100, played an active role in 
IOMMU spec community, I'm ready to help the community by reviewing 
RISC-V IOMMU related changes.
Joey is responsible for SpacemiT RISC-V linux kernel support. We have 
chances to test RISC-V linux kernel supports very early using 
pre-silicon real hardware here in a silicon team to help the community.
Any suggestions?

> 
>>   L:	iommu at lists.linux.dev
>>   L:	linux-riscv at lists.infradead.org
>>   S:	Maintained
>>   T:	git git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux.git
>>   F:	Documentation/devicetree/bindings/iommu/riscv,iommu.yaml
>>   F:	drivers/iommu/riscv/
>> +F:	tools/perf/pmu-events/arch/riscv/spacemit/iommu/

checkpatch.pl complains missing files and given the reason above, I 
didn't create a "Supported" part of RISC-V IOMMU HPM.

Best regards,
Lv