From: Conor Dooley <conor.dooley@microchip.com>
To: Andrew Jones <ajones@ventanamicro.com>
Cc: <guoren@kernel.org>, <paul.walmsley@sifive.com>,
<anup@brainfault.org>, <peterz@infradead.org>, <mingo@redhat.com>,
<will@kernel.org>, <palmer@rivosinc.com>, <longman@redhat.com>,
<boqun.feng@gmail.com>, <tglx@linutronix.de>,
<paulmck@kernel.org>, <rostedt@goodmis.org>,
<rdunlap@infradead.org>, <catalin.marinas@arm.com>,
<xiaoguang.xing@sophgo.com>, <bjorn@rivosinc.com>,
<alexghiti@rivosinc.com>, <keescook@chromium.org>,
<greentime.hu@sifive.com>, <jszhang@kernel.org>,
<wefu@redhat.com>, <wuwei2016@iscas.ac.cn>, <leobras@redhat.com>,
<linux-arch@vger.kernel.org>, <linux-riscv@lists.infradead.org>,
<linux-doc@vger.kernel.org>, <kvm@vger.kernel.org>,
<virtualization@lists.linux-foundation.org>,
<linux-csky@vger.kernel.org>, Guo Ren <guoren@linux.alibaba.com>
Subject: Re: [PATCH V11 03/17] riscv: Use Zicbop in arch_xchg when available
Date: Fri, 15 Sep 2023 13:53:00 +0100 [thread overview]
Message-ID: <20230915-unseated-runway-7f519a57034f@wendy> (raw)
In-Reply-To: <20230915-ff4bd6cd721ed9bc4c4eb101@orel>
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On Fri, Sep 15, 2023 at 02:14:40PM +0200, Andrew Jones wrote:
> On Fri, Sep 15, 2023 at 12:37:50PM +0100, Conor Dooley wrote:
> > On Thu, Sep 14, 2023 at 04:47:18PM +0200, Andrew Jones wrote:
> > > On Thu, Sep 14, 2023 at 04:25:53PM +0200, Andrew Jones wrote:
> > > > On Sun, Sep 10, 2023 at 04:28:57AM -0400, guoren@kernel.org wrote:
> > > > > From: Guo Ren <guoren@linux.alibaba.com>
> > > So, we could maybe proceed with assuming we
> > > can use zicbom_block_size for prefetch, for now. If a platform comes along
> > > that interpreted the spec differently, requiring prefetch block size to
> > > be specified separately, then we'll cross that bridge when we get there.
> >
> > That said, I think I suggested originally having the zicboz stuff default
> > to the zicbom size too, so I'd be happy with prefetch stuff working
> > exclusively that way until someone comes along looking for different sizes.
> > The binding should be updated though since
> >
> > riscv,cbom-block-size:
> > $ref: /schemas/types.yaml#/definitions/uint32
> > description:
> > The blocksize in bytes for the Zicbom cache operations.
> >
> > would no longer be a complete description.
> >
> > While thinking about new wording though, it feels really clunky to describe
> > it like:
> > The block size in bytes for the Zicbom cache operations, Zicbop
> > cache operations will default to this block size where not
> > explicitly defined.
> >
> > since there's then no way to actually define the block size if it is
> > different. Unless you've got some magic wording, I'd rather document
> > riscv,cbop-block-size, even if we are going to use riscv,cbom-block-size
> > as the default.
> >
>
> Sounds good to me, but if it's documented, then we should probably
> implement its parsing. Then, at that point, I wonder if it makes sense to
> have the fallback at all, or if it's not better just to require all the
> DTs to be explicit (even if redundant).
Sure, why not I guess.
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next prev parent reply other threads:[~2023-09-15 12:53 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-10 8:28 [PATCH V11 00/17] riscv: Add Native/Paravirt qspinlock support guoren
2023-09-10 8:28 ` [PATCH V11 01/17] asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock guoren
2023-09-11 19:05 ` Leonardo Brás
2023-09-13 1:55 ` Guo Ren
2023-09-13 7:59 ` Leonardo Bras
2023-09-10 8:28 ` [PATCH V11 02/17] asm-generic: ticket-lock: Move into ticket_spinlock.h guoren
2023-09-13 8:15 ` Leonardo Bras
2023-09-10 8:28 ` [PATCH V11 03/17] riscv: Use Zicbop in arch_xchg when available guoren
2023-09-13 8:49 ` Leonardo Bras
2023-09-15 12:36 ` Guo Ren
2023-09-16 1:25 ` Leonardo Bras
2023-09-17 14:34 ` Guo Ren
2023-09-19 5:13 ` Leonardo Bras
2023-09-19 7:53 ` Guo Ren
2023-09-19 14:38 ` Leonardo Bras
2023-09-14 13:47 ` Andrew Jones
2023-09-15 8:22 ` Leonardo Bras
2023-09-15 11:07 ` Andrew Jones
2023-09-15 11:26 ` Conor Dooley
2023-09-15 12:22 ` Andrew Jones
2023-09-15 12:42 ` Conor Dooley
2023-09-16 0:05 ` Conor Dooley
2023-09-15 20:32 ` Leonardo Bras
2023-09-14 14:25 ` Andrew Jones
2023-09-14 14:47 ` Andrew Jones
2023-09-15 11:37 ` Conor Dooley
2023-09-15 12:14 ` Andrew Jones
2023-09-15 12:53 ` Conor Dooley [this message]
2023-12-31 8:29 ` guoren
2023-09-10 8:28 ` [PATCH V11 04/17] locking/qspinlock: Improve xchg_tail for number of cpus >= 16k guoren
2023-09-11 2:35 ` Waiman Long
2023-09-11 3:09 ` Guo Ren
2023-09-11 13:03 ` Waiman Long
2023-09-12 1:10 ` Guo Ren
2023-09-13 8:55 ` Leonardo Bras
2023-09-13 12:52 ` Guo Ren
2023-09-13 13:06 ` Waiman Long
2023-09-14 3:45 ` Guo Ren
2023-09-10 8:28 ` [PATCH V11 05/17] riscv: qspinlock: Add basic queued_spinlock support guoren
2023-09-13 20:28 ` Leonardo Bras
2023-09-14 4:46 ` Guo Ren
2023-09-14 9:43 ` Leonardo Bras
2023-09-15 2:10 ` Guo Ren
2023-09-15 9:08 ` Leonardo Bras
2023-09-17 15:02 ` Guo Ren
2023-09-19 5:20 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 06/17] riscv: qspinlock: Introduce combo spinlock guoren
2023-09-10 11:06 ` Guo Ren
2023-09-13 20:37 ` Leonardo Bras
2023-09-13 20:49 ` Leonardo Bras
2023-09-14 4:49 ` Guo Ren
2023-09-14 7:17 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 07/17] riscv: qspinlock: Introduce qspinlock param for command line guoren
2023-09-11 15:22 ` Waiman Long
2023-09-12 1:06 ` Guo Ren
2023-09-11 15:34 ` Waiman Long
2023-09-12 1:08 ` Guo Ren
2023-09-14 7:32 ` Leonardo Bras
2023-09-14 17:23 ` Waiman Long
2023-09-10 8:29 ` [PATCH V11 08/17] riscv: qspinlock: Add virt_spin_lock() support for KVM guest guoren
2023-09-14 8:02 ` Leonardo Bras
2023-09-17 15:12 ` Guo Ren
2023-09-19 5:30 ` Leonardo Bras
2023-09-19 8:04 ` Guo Ren
2023-09-19 14:40 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 09/17] riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup guoren
2023-09-14 8:32 ` Leonardo Bras
2023-09-17 15:15 ` Guo Ren
2023-09-19 5:34 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 10/17] riscv: qspinlock: errata: Enable qspinlock for T-HEAD processors guoren
2023-09-14 9:36 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 11/17] RISC-V: paravirt: pvqspinlock: Add paravirt qspinlock skeleton guoren
2023-09-15 5:42 ` Leonardo Bras
2023-09-17 14:58 ` Guo Ren
2023-09-19 5:43 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 12/17] RISC-V: paravirt: pvqspinlock: Add nopvspin kernel parameter guoren
2023-09-15 6:05 ` Leonardo Bras
2023-09-17 15:03 ` Guo Ren
2023-09-19 5:44 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 13/17] RISC-V: paravirt: pvqspinlock: Add SBI implementation guoren
2023-09-15 6:23 ` Leonardo Bras
2023-09-17 15:06 ` Guo Ren
2023-09-19 5:45 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 14/17] RISC-V: paravirt: pvqspinlock: Add kconfig entry guoren
2023-09-15 6:25 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 15/17] RISC-V: paravirt: pvqspinlock: Add trace point for pv_kick/wait guoren
2023-09-15 6:33 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 16/17] RISC-V: paravirt: pvqspinlock: KVM: Add paravirt qspinlock skeleton guoren
2023-09-15 6:46 ` Leonardo Bras
2023-09-10 8:29 ` [PATCH V11 17/17] RISC-V: paravirt: pvqspinlock: KVM: Implement kvm_sbi_ext_pvlock_kick_cpu() guoren
2023-09-15 6:52 ` Leonardo Bras
2023-09-10 8:58 ` [PATCH V11 00/17] riscv: Add Native/Paravirt qspinlock support Conor Dooley
2023-09-10 9:16 ` Guo Ren
2023-09-10 9:20 ` Guo Ren
2023-09-10 9:31 ` Conor Dooley
2023-09-10 9:49 ` Guo Ren
2023-09-10 19:45 ` Conor Dooley
2023-09-11 3:36 ` Guo Ren
2023-09-11 12:52 ` Conor Dooley
2023-09-12 1:33 ` Guo Ren
2023-09-12 8:07 ` Conor Dooley
2023-09-12 10:58 ` Guo Ren
2023-11-06 20:42 ` Leonardo Bras
2023-11-12 4:23 ` Guo Ren
2023-11-13 10:19 ` Leonardo Bras Soares Passos
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