From: Andrew Jones <ajones@ventanamicro.com>
To: Haibo Xu <haibo1.xu@intel.com>
Cc: xiaobo55x@gmail.com, Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Paolo Bonzini <pbonzini@redhat.com>,
Shuah Khan <shuah@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Anup Patel <anup@brainfault.org>,
Atish Patra <atishp@atishpatra.org>, Guo Ren <guoren@kernel.org>,
Conor Dooley <conor.dooley@microchip.com>,
Mayuresh Chitale <mchitale@ventanamicro.com>,
Daniel Henrique Barboza <dbarboza@ventanamicro.com>,
Jisheng Zhang <jszhang@kernel.org>,
Samuel Holland <samuel@sholland.org>,
Minda Chen <minda.chen@starfivetech.com>,
Sean Christopherson <seanjc@google.com>,
Peter Xu <peterx@redhat.com>, Like Xu <likexu@tencent.com>,
Vipin Sharma <vipinsh@google.com>,
Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>,
Thomas Huth <thuth@redhat.com>,
Aaron Lewis <aaronlewis@google.com>,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
kvm@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
kvm-riscv@lists.infradead.org
Subject: Re: [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h
Date: Wed, 13 Dec 2023 15:02:51 +0100 [thread overview]
Message-ID: <20231213-9d5ad03bed3056007c6e714d@orel> (raw)
In-Reply-To: <7b633cc441f5133608597463301fef122f5174d3.1702371136.git.haibo1.xu@intel.com>
On Tue, Dec 12, 2023 at 05:31:14PM +0800, Haibo Xu wrote:
> Borrow the cpu_relax() definitions from kernel's
> arch/riscv/include/asm/vdso/processor.h to tools/ for riscv.
>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> ---
> tools/arch/riscv/include/asm/vdso/processor.h | 32 +++++++++++++++++++
> 1 file changed, 32 insertions(+)
> create mode 100644 tools/arch/riscv/include/asm/vdso/processor.h
>
> diff --git a/tools/arch/riscv/include/asm/vdso/processor.h b/tools/arch/riscv/include/asm/vdso/processor.h
> new file mode 100644
> index 000000000000..662aca039848
> --- /dev/null
> +++ b/tools/arch/riscv/include/asm/vdso/processor.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +#ifndef __ASM_VDSO_PROCESSOR_H
> +#define __ASM_VDSO_PROCESSOR_H
> +
> +#ifndef __ASSEMBLY__
> +
> +#include <asm-generic/barrier.h>
> +
> +static inline void cpu_relax(void)
> +{
> +#ifdef __riscv_muldiv
> + int dummy;
> + /* In lieu of a halt instruction, induce a long-latency stall. */
> + __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
> +#endif
> +
> +#ifdef CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE
> + /*
> + * Reduce instruction retirement.
> + * This assumes the PC changes.
> + */
> + __asm__ __volatile__ ("pause");
> +#else
> + /* Encoding of the pause instruction */
> + __asm__ __volatile__ (".4byte 0x100000F");
> +#endif
> + barrier();
> +}
> +
> +#endif /* __ASSEMBLY__ */
> +
> +#endif /* __ASM_VDSO_PROCESSOR_H */
> --
> 2.34.1
>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
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next prev parent reply other threads:[~2023-12-13 14:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
2023-12-12 9:31 ` [PATCH v4 01/11] selftests/kvm: Fix issues with $(SPLIT_TESTS) Haibo Xu
2023-12-12 9:31 ` [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code Haibo Xu
2023-12-14 6:41 ` Anup Patel
2023-12-12 9:31 ` [PATCH v4 03/11] KVM: selftests: Add CONFIG_64BIT definition for the build Haibo Xu
2023-12-13 13:52 ` Andrew Jones
2023-12-12 9:31 ` [PATCH v4 04/11] tools: riscv: Add header file csr.h Haibo Xu
2023-12-12 9:31 ` [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h Haibo Xu
2023-12-13 14:02 ` Andrew Jones [this message]
2023-12-12 9:31 ` [PATCH v4 06/11] KVM: riscv: selftests: Switch to use macro from csr.h Haibo Xu
2023-12-12 9:31 ` [PATCH v4 07/11] KVM: riscv: selftests: Add exception handling support Haibo Xu
2023-12-12 9:31 ` [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id Haibo Xu
2023-12-13 14:08 ` Andrew Jones
2023-12-19 2:28 ` Haibo Xu
2023-12-12 9:31 ` [PATCH v4 09/11] KVM: riscv: selftests: Change vcpu_has_ext to a common function Haibo Xu
2023-12-12 9:31 ` [PATCH v4 10/11] KVM: riscv: selftests: Add sstc timer test Haibo Xu
2023-12-13 14:18 ` Andrew Jones
2023-12-12 9:31 ` [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch " Haibo Xu
2023-12-13 14:27 ` Andrew Jones
2023-12-14 6:44 ` Anup Patel
2023-12-19 18:22 ` Marc Zyngier
2023-12-20 6:50 ` Haibo Xu
2023-12-20 9:00 ` Marc Zyngier
2023-12-20 13:51 ` Haibo Xu
2023-12-20 13:58 ` Marc Zyngier
2023-12-21 2:58 ` Haibo Xu
2023-12-21 9:25 ` Marc Zyngier
2024-01-04 11:09 ` Andrew Jones
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