[dpdk-dev] [PATCH 1/2] eal/arm64: modify I/O device memory barriers

[Jerin Jacob]

-----Original Message-----
> Date: Tue, 26 Dec 2017 20:28:23 -0800
> From: Yongseok Koh <yskoh at mellanox.com>
> To: adrien.mazarguil at 6wind.com, nelio.laranjeiro at 6wind.com,
>  jerin.jacob at caviumnetworks.com, jianbo.liu at arm.com
> CC: dev at dpdk.org, Yongseok Koh <yskoh at mellanox.com>, Thomas Speier
>  <tspeier at qti.qualcomm.com>
> Subject: [PATCH 1/2] eal/arm64: modify I/O device memory barriers
> X-Mailer: git-send-email 2.11.0
> 
> Instead of using system-wide 'dsb' instruction for IO barriers, 'dmb' is
> sufficient and could bring better performance. Using 'dmb' with Outer
> Shareable Domain option is also consistent with linux kernel.
> 
> Cc: Thomas Speier <tspeier at qti.qualcomm.com>
> 
> Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
> Acked-by: Thomas Speier <tspeier at qti.qualcomm.com>
> Acked-by: Shahaf Shuler <shahafs at mellanox.com>

Acked-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>

> ---
>  lib/librte_eal/common/include/arch/arm/rte_atomic_64.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h b/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
> index 0b70d6209..8dcce6054 100644
> --- a/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
> +++ b/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
> @@ -58,11 +58,11 @@ extern "C" {
>  
>  #define rte_smp_rmb() dmb(ishld)
>  
> -#define rte_io_mb() rte_mb()
> +#define rte_io_mb() dmb(osh)
>  
> -#define rte_io_wmb() rte_wmb()
> +#define rte_io_wmb() dmb(oshst)
>  
> -#define rte_io_rmb() rte_rmb()
> +#define rte_io_rmb() dmb(oshld)
>  
>  #ifdef __cplusplus
>  }
> -- 
> 2.11.0
>