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From: Catalin Marinas <catalin.marinas@arm.com>
To: Guangbin Huang <huangguangbin2@huawei.com>
Cc: davem@davemloft.net, kuba@kernel.org, will@kernel.org,
	maz@kernel.org, mark.rutland@arm.com, dbrazdil@google.com,
	qperret@google.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, lipeng321@huawei.com
Subject: Re: [PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging
Date: Fri, 30 Jul 2021 10:39:21 +0100	[thread overview]
Message-ID: <20210730093921.GA8570@arm.com> (raw)
In-Reply-To: <1627614864-50824-2-git-send-email-huangguangbin2@huawei.com>

On Fri, Jul 30, 2021 at 11:14:21AM +0800, Guangbin Huang wrote:
> From: Xiongfeng Wang <wangxiongfeng2@huawei.com>
> 
> DGH prohibits merging memory accesses with Normal-NC or Device-GRE
> attributes before the hint instruction with any memory accesses
> appearing after the hint instruction. Provide macros to expose it to the
> arch code.
> 
> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
> Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
> Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
> ---
>  arch/arm64/include/asm/assembler.h | 7 +++++++
>  arch/arm64/include/asm/barrier.h   | 1 +
>  2 files changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
> index 89faca0e740d..5a3348b5e9f3 100644
> --- a/arch/arm64/include/asm/assembler.h
> +++ b/arch/arm64/include/asm/assembler.h
> @@ -90,6 +90,13 @@
>  	.endm
>  
>  /*
> + * Data gathering hint
> + */
> +	.macro	dgh
> +	hint	#6
> +	.endm

Do we need this macro? It doesn't seem to be used anywhere.

-- 
Catalin

  reply	other threads:[~2021-07-30  9:39 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30  3:14 [PATCH net-next 0/4] net: hns3: add support for TX push Guangbin Huang
2021-07-30  3:14 ` [PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging Guangbin Huang
2021-07-30  9:39   ` Catalin Marinas [this message]
2021-07-30  3:14 ` [PATCH net-next 2/4] io: add function to flush the write combine buffer to device immediately Guangbin Huang
2021-07-30  9:00   ` Will Deacon
2021-10-11 13:37     ` huangguangbin (A)
2021-10-15  1:48     ` Xiongfeng Wang
2021-07-30  9:42   ` Catalin Marinas
2021-07-30  3:14 ` [PATCH net-next 3/4] net: hns3: add support for TX push mode Guangbin Huang
2021-07-30  3:14 ` [PATCH net-next 4/4] net: hns3: add ethtool priv-flag for TX push Guangbin Huang

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