linux-kernel - Re: [PATCH v2 02/13] riscv: move riscv_noncoherent

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Date:   Sun, 04 Dec 2022 22:52:03 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Jisheng Zhang <jszhang@...nel.org>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v2 02/13] riscv: move riscv_noncoherent_supported() out of ZICBOM probe

Am Sonntag, 4. Dezember 2022, 18:46:21 CET schrieb Jisheng Zhang:
> It's a bit weird to call riscv_noncoherent_supported() each time when
> insmoding a module. Move the calling out of feature patch func.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  arch/riscv/kernel/cpufeature.c | 1 -
>  arch/riscv/kernel/setup.c      | 2 ++
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index c743f0adc794..364d1fe86bea 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -274,7 +274,6 @@ static bool __init_or_module cpufeature_probe_zicbom(unsigned int stage)
>  	if (!riscv_isa_extension_available(NULL, ZICBOM))
>  		return false;
>  
> -	riscv_noncoherent_supported();
>  	return true;
>  }
>  
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 86acd690d529..6eea40bf8c6b 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -300,6 +300,8 @@ void __init setup_arch(char **cmdline_p)
>  	riscv_init_cbom_blocksize();
>  	riscv_fill_hwcap();
>  	apply_boot_alternatives();
> +	if (riscv_isa_extension_available(NULL, ZICBOM))
> +		riscv_noncoherent_supported();

hmm, this changes the behaviour slightly. In the probe function there
is the
	if (!IS_ENABLED(CONFIG_RISCV_ISA_ZICBOM))
		return false;
at the top, so with this change the second WARN_TAINT in arch_setup_dma_ops
will behave differently

Heiko