linux-kernel - Re: [PATCH] nvme: Enable acceleration feature of A64FX processor

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Message-ID: <20190201145414.GA22199@localhost.localdomain>
Date:   Fri, 1 Feb 2019 07:54:14 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     Takao Indoh <indou.takao@...fujitsu.com>
Cc:     axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Takao Indoh <indou.takao@...itsu.com>
Subject: Re: [PATCH] nvme: Enable acceleration feature of A64FX processor

On Fri, Feb 01, 2019 at 09:46:15PM +0900, Takao Indoh wrote:
> From: Takao Indoh <indou.takao@...itsu.com>
> 
> Fujitsu A64FX processor has a feature to accelerate data transfer of
> internal bus by relaxed ordering. It is enabled when the bit 56 of dma
> address is set to 1.

Wait, what? RO is a standard PCIe TLP attribute. Why would we need this?