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
next prev parent 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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