linux-kernel - Re: [External] Re: [PATCH v3 2/3] RISC-V: hwprobe: Expose Zicbom extension and its block size

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Message-ID: <20250113-da3ae77c9eb1342ac19ec59c@orel>
Date: Mon, 13 Jan 2025 13:41:19 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: yunhui cui <cuiyunhui@...edance.com>
Cc: alexghiti@...osinc.com, andybnac@...il.com, aou@...s.berkeley.edu, 
	charlie@...osinc.com, cleger@...osinc.com, conor.dooley@...rochip.com, 
	conor@...nel.org, corbet@....net, evan@...osinc.com, jesse@...osinc.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, palmer@...belt.com, paul.walmsley@...ive.com, 
	samuel.holland@...ive.com, shuah@...nel.org
Subject: Re: [External] Re: [PATCH v3 2/3] RISC-V: hwprobe: Expose Zicbom
 extension and its block size

On Mon, Jan 13, 2025 at 07:29:39PM +0800, yunhui cui wrote:
> Hi drew,
> 
> On Mon, Jan 13, 2025 at 5:07 PM Andrew Jones <ajones@...tanamicro.com> wrote:
> >
> > On Mon, Jan 13, 2025 at 04:36:34PM +0800, Yunhui Cui wrote:
> > > Expose Zicbom through hwprobe and also provide a key to extract its
> > > respective block size.
> > >
> > > Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> > > ---
> > >  Documentation/arch/riscv/hwprobe.rst  | 6 ++++++
> > >  arch/riscv/include/asm/hwprobe.h      | 2 +-
> > >  arch/riscv/include/uapi/asm/hwprobe.h | 2 ++
> > >  arch/riscv/kernel/sys_hwprobe.c       | 6 ++++++
> > >  4 files changed, 15 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> > > index 955fbcd19ce9..7a47cbdbcf8e 100644
> > > --- a/Documentation/arch/riscv/hwprobe.rst
> > > +++ b/Documentation/arch/riscv/hwprobe.rst
> > > @@ -94,6 +94,9 @@ The following keys are defined:
> > >    * :c:macro:`RISCV_HWPROBE_EXT_ZICBOZ`: The Zicboz extension is supported, as
> > >         ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
> > >
> > > +  * :c:macro:`RISCV_HWPROBE_EXT_ZICBOM`: The Zicbom extension is supported, as
> > > +       ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
> > > +
> >
> > This should come after RISCV_HWPROBE_EXT_SUPM since this document has the
> > defines sorted in the order in which they are introduced (although I
> > personally wouldn't mind if we ordered them alphabetically instead)
> OK
> 
> >
> > >    * :c:macro:`RISCV_HWPROBE_EXT_ZBC` The Zbc extension is supported, as defined
> > >         in version 1.0 of the Bit-Manipulation ISA extensions.
> > >
> > > @@ -273,6 +276,9 @@ The following keys are defined:
> > >  * :c:macro:`RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`: An unsigned int which
> > >    represents the size of the Zicboz block in bytes.
> > >
> > > +* :c:macro:`RISCV_HWPROBE_KEY_ZICBOM_BLOCK_SIZE`: An unsigned int which
> > > +  represents the size of the Zicbom block in bytes.
> > > +
> >
> > Should be moved below RISCV_HWPROBE_KEY_TIME_CSR_FREQ
> 
> Why should it be moved below RISCV_HWPROBE_KEY_TIME_CSR_FREQ?

Oh, right. It should be below RISCV_HWPROBE_KEY_MISALIGNED_VECTOR_PERF for
the same reason as above (order of introduction).

Thanks,
drew