From: Guangbin Huang <huangguangbin2@huawei.com> To: <davem@davemloft.net>, <kuba@kernel.org>, <catalin.marinas@arm.com>, <will@kernel.org>, <maz@kernel.org>, <mark.rutland@arm.com>, <dbrazdil@google.com>, <qperret@google.com> Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <lipeng321@huawei.com>, <huangguangbin2@huawei.com> Subject: [RFC PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging Date: Fri, 23 Jul 2021 14:16:06 +0800 [thread overview] Message-ID: <1627020969-32945-2-git-send-email-huangguangbin2@huawei.com> (raw) In-Reply-To: <1627020969-32945-1-git-send-email-huangguangbin2@huawei.com> 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 + +/* * RAS Error Synchronization barrier */ .macro esb diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h index 451e11e5fd23..02e1735706d2 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -22,6 +22,7 @@ #define dmb(opt) asm volatile("dmb " #opt : : : "memory") #define dsb(opt) asm volatile("dsb " #opt : : : "memory") +#define dgh() asm volatile("hint #6" : : : "memory") #define psb_csync() asm volatile("hint #17" : : : "memory") #define tsb_csync() asm volatile("hint #18" : : : "memory") #define csdb() asm volatile("hint #20" : : : "memory") -- 2.8.1
WARNING: multiple messages have this Message-ID (diff)
From: Guangbin Huang <huangguangbin2@huawei.com> To: <davem@davemloft.net>, <kuba@kernel.org>, <catalin.marinas@arm.com>, <will@kernel.org>, <maz@kernel.org>, <mark.rutland@arm.com>, <dbrazdil@google.com>, <qperret@google.com> Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <lipeng321@huawei.com>, <huangguangbin2@huawei.com> Subject: [RFC PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging Date: Fri, 23 Jul 2021 14:16:06 +0800 [thread overview] Message-ID: <1627020969-32945-2-git-send-email-huangguangbin2@huawei.com> (raw) In-Reply-To: <1627020969-32945-1-git-send-email-huangguangbin2@huawei.com> 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 + +/* * RAS Error Synchronization barrier */ .macro esb diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h index 451e11e5fd23..02e1735706d2 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -22,6 +22,7 @@ #define dmb(opt) asm volatile("dmb " #opt : : : "memory") #define dsb(opt) asm volatile("dsb " #opt : : : "memory") +#define dgh() asm volatile("hint #6" : : : "memory") #define psb_csync() asm volatile("hint #17" : : : "memory") #define tsb_csync() asm volatile("hint #18" : : : "memory") #define csdb() asm volatile("hint #20" : : : "memory") -- 2.8.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-23 6:19 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-23 6:16 [RFC PATCH net-next 0/4] net: hns3: add support for TX push Guangbin Huang 2021-07-23 6:16 ` Guangbin Huang 2021-07-23 6:16 ` Guangbin Huang [this message] 2021-07-23 6:16 ` [RFC PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging Guangbin Huang 2021-07-23 6:16 ` [RFC PATCH net-next 2/4] io: add function to flush the write combine buffer to device immediately Guangbin Huang 2021-07-23 6:16 ` Guangbin Huang 2021-07-23 6:16 ` [RFC PATCH net-next 3/4] net: hns3: add support for TX push mode Guangbin Huang 2021-07-23 6:16 ` Guangbin Huang 2021-07-23 6:16 ` [RFC PATCH net-next 4/4] net: hns3: add ethtool priv-flag for TX push Guangbin Huang 2021-07-23 6:16 ` Guangbin Huang
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