linux-kernel - Re: [PATCH 1/3] RISC-V: add Bitmanip/Scalar Crypto parsing from DT

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Date:   Wed, 28 Jun 2023 11:59:43 +0200
From:   Samuel Ortiz <sameo@...osinc.com>
To:     "Hongren (Zenithal) Zheng" <i@...ithal.me>
Cc:     Conor Dooley <conor@...nel.org>, Evan Green <evan@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, linux@...osinc.com,
        Conor Dooley <conor.dooley@...rochip.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Anup Patel <apatel@...tanamicro.com>,
        linux-kernel@...r.kernel.org, Guo Ren <guoren@...nel.org>,
        Atish Patra <atishp@...osinc.com>,
        Björn Töpel <bjorn@...osinc.com>,
        Jiatai He <jiatai2021@...as.ac.cn>
Subject: Re: [PATCH 1/3] RISC-V: add Bitmanip/Scalar Crypto parsing from DT

On Wed, Jun 28, 2023 at 03:03:58AM +0800, Hongren (Zenithal) Zheng wrote:
> On Tue, Jun 27, 2023 at 07:48:15PM +0100, Conor Dooley wrote:
> > On Tue, Jun 27, 2023 at 11:14:30AM -0700, Evan Green wrote:
> > > On Tue, Jun 27, 2023 at 7:38 AM Samuel Ortiz <sameo@...osinc.com> wrote:
> > > >
> > > > From: "Hongren (Zenithal) Zheng" <i@...ithal.me>
> > > >
> > > > This patch parses Zb/Zk related string from DT and
> > 
> > %s/This patch//
> > 
> > > > output them in cpuinfo
> > > >
> > > > One thing worth noting is that if DT provides zk,
> > > > all zbkb, zbkc, zbkx and zkn, zkr, zkt would be enabled.
> > 
> > Please explain why this is okay.
> 
> From riscv scalar crypto spec, zk is a shorthand
> for zkn, zkr and zkt and zkn also includes zbkb, zbkc
> and zbkx.
> 
> > 
> > > > Note that zk is a valid extension name and the current
> > > > DT binding spec allows this.
> > > >
> > > > This patch also changes the logical id of
> > > > existing multi-letter extensions and adds a statement
> > > > that instead of logical id compatibility, the order
> > > > is needed.
> > 
> > Does it?
> 
> That is in the old version of this patch,
> should be removed now
> see https://lore.kernel.org/linux-riscv/YqY0aSngjI0Hc5d4@Sun/
> 
> > 
> > > > There currently lacks a mechanism to merge them when
> > > > producing cpuinfo. Namely if you provide a riscv,isa
> > > > "rv64imafdc_zk_zks", the cpuinfo output would be
> > > > "rv64imafdc_zbkb_zbkc_zbkx_zknd_zkne_zknh_zkr_zksed
> > > > _zksh_zkt"
> > 
> > I think this is fine.
> > 
> > Please re-wrap this all to 72 characters.
> > 
> > > >
> > > > Tested-by: Jiatai He <jiatai2021@...as.ac.cn>
> > > > Signed-off-by: Hongren (Zenithal) Zheng <i@...ithal.me>
> > 
> > This is missing your SoB Samuel.
> > 
> > > > ---
> > > >  arch/riscv/include/asm/hwcap.h | 11 +++++++++++
> > > >  arch/riscv/kernel/cpu.c        | 11 +++++++++++
> > > >  arch/riscv/kernel/cpufeature.c | 30 ++++++++++++++++++++++++++++++
> > > >  3 files changed, 52 insertions(+)
> > > >
> > > > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> > > > index f041bfa7f6a0..b80ca6e77088 100644
> > > > --- a/arch/riscv/include/asm/hwcap.h
> > > > +++ b/arch/riscv/include/asm/hwcap.h
> > > > @@ -53,6 +53,17 @@
> > > >  #define RISCV_ISA_EXT_ZICSR            40
> > > >  #define RISCV_ISA_EXT_ZIFENCEI         41
> > > >  #define RISCV_ISA_EXT_ZIHPM            42
> > > > +#define RISCV_ISA_EXT_ZBC              43
> > > > +#define RISCV_ISA_EXT_ZBKB             44
> > > > +#define RISCV_ISA_EXT_ZBKC             45
> > > > +#define RISCV_ISA_EXT_ZBKX             46
> > > > +#define RISCV_ISA_EXT_ZKND             47
> > > > +#define RISCV_ISA_EXT_ZKNE             48
> > > > +#define RISCV_ISA_EXT_ZKNH             49
> > > > +#define RISCV_ISA_EXT_ZKR              50
> > > > +#define RISCV_ISA_EXT_ZKSED            51
> > > > +#define RISCV_ISA_EXT_ZKSH             52
> > > > +#define RISCV_ISA_EXT_ZKT              53
> > > >
> > > >  #define RISCV_ISA_EXT_MAX              64
> > > >  #define RISCV_ISA_EXT_NAME_LEN_MAX     32
> > > > diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> > > > index a2fc952318e9..10524322a4c0 100644
> > > > --- a/arch/riscv/kernel/cpu.c
> > > > +++ b/arch/riscv/kernel/cpu.c
> > > > @@ -215,7 +215,18 @@ static struct riscv_isa_ext_data isa_ext_arr[] = {
> > > >         __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
> > > >         __RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
> > > >         __RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
> > > > +       __RISCV_ISA_EXT_DATA(zbc, RISCV_ISA_EXT_ZBC),
> > > > +       __RISCV_ISA_EXT_DATA(zbkb, RISCV_ISA_EXT_ZBKB),
> > > > +       __RISCV_ISA_EXT_DATA(zbkc, RISCV_ISA_EXT_ZBKC),
> > > > +       __RISCV_ISA_EXT_DATA(zbkx, RISCV_ISA_EXT_ZBKX),
> > > >         __RISCV_ISA_EXT_DATA(zbs, RISCV_ISA_EXT_ZBS),
> > > > +       __RISCV_ISA_EXT_DATA(zknd, RISCV_ISA_EXT_ZKND),
> > > > +       __RISCV_ISA_EXT_DATA(zkne, RISCV_ISA_EXT_ZKNE),
> > > > +       __RISCV_ISA_EXT_DATA(zknh, RISCV_ISA_EXT_ZKNH),
> > > > +       __RISCV_ISA_EXT_DATA(zkr, RISCV_ISA_EXT_ZKR),
> > > > +       __RISCV_ISA_EXT_DATA(zksed, RISCV_ISA_EXT_ZKSED),
> > > > +       __RISCV_ISA_EXT_DATA(zksh, RISCV_ISA_EXT_ZKSH),
> > > > +       __RISCV_ISA_EXT_DATA(zkt, RISCV_ISA_EXT_ZKT),
> > > >         __RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
> > > >         __RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
> > > >         __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
> > > > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > > > index bdcf460ea53d..447f853a5a4c 100644
> > > > --- a/arch/riscv/kernel/cpufeature.c
> > > > +++ b/arch/riscv/kernel/cpufeature.c
> > > > @@ -309,10 +309,40 @@ void __init riscv_fill_hwcap(void)
> > > >                                 SET_ISA_EXT_MAP("svpbmt", RISCV_ISA_EXT_SVPBMT);
> > > >                                 SET_ISA_EXT_MAP("zba", RISCV_ISA_EXT_ZBA);
> > > >                                 SET_ISA_EXT_MAP("zbb", RISCV_ISA_EXT_ZBB);
> > > > +                               SET_ISA_EXT_MAP("zbc", RISCV_ISA_EXT_ZBC);
> > > >                                 SET_ISA_EXT_MAP("zbs", RISCV_ISA_EXT_ZBS);
> > > > +                               SET_ISA_EXT_MAP("zbkb", RISCV_ISA_EXT_ZBKB);
> > 
> > This order does not look correct, please add them in alphanumerical
> > order as the comment these SET_ISA_EXT_MAP()s requests. Ditto below.
> 
> Agreed. Seems that I did not worked carefully for this part.

Or it could be me when rebasing that patch. In any case, it will be
fixed with v2 of the patch.

Cheers,
Samuel.