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

From: Conor Dooley <conor@kernel.org>
To: Lv Zheng <lv.zheng@linux.spacemit.com>
Cc: Tomasz Jeznach <tjeznach@rivosinc.com>,
	Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>, Jingyu Li <joey.li@spacemit.com>,
	Zhijian Chen <zhijian@spacemit.com>,
	iommu@lists.linux.dev, linux-perf-users@vger.kernel.org,
	linux-riscv@lists.infradead.org, spacemit@lists.linux.dev,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v3 8/8] perf vendor events riscv:: Add support for spacemit,riscv-iommu HPM aliasing
Date: Wed, 4 Feb 2026 17:38:15 +0000	[thread overview]
Message-ID: <20260204-suds-shush-d85872589cb3@spud> (raw)
In-Reply-To: <5242DDF0A783AF08+e141f1898581018f8dd0723cb5c870c23ec679d6.1770195980.git.lv.zheng@linux.spacemit.com>

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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@linux.spacemit.com>
> Signed-off-by: Jingyu Li <joey.li@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@rivosinc.com>
> +M:	Lv Zheng <lv.zheng@linux.spacemit.com>
> +M:	Jingyu Li <joey.li@spacemit.com>

To be frank, this looks misguided, or at least premature, to me, given the
state of the patchset.

>  L:	iommu@lists.linux.dev
>  L:	linux-riscv@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/

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