linux-kernel - RE: [PATCH v7 2/3] PCI: Enable PCIe Relaxed Ordering if supported

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DD004C785@AcuExch.aculab.com>
Date:   Mon, 7 Aug 2017 09:04:19 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Casey Leedom' <leedom@...lsio.com>,
        "Raj, Ashok" <ashok.raj@...el.com>
CC:     Ding Tianhong <dingtianhong@...wei.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "helgaas@...nel.org" <helgaas@...nel.org>,
        "Michael Werner" <werner@...lsio.com>,
        Ganesh GR <ganeshgr@...lsio.com>,
        "asit.k.mallick@...el.com" <asit.k.mallick@...el.com>,
        "patrick.j.cramer@...el.com" <patrick.j.cramer@...el.com>,
        "Suravee.Suthikulpanit@....com" <Suravee.Suthikulpanit@....com>,
        "Bob.Shaw@....com" <Bob.Shaw@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
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        "jeffrey.t.kirsher@...el.com" <jeffrey.t.kirsher@...el.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
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        "mark.rutland@....com" <mark.rutland@....com>,
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        <linux-arm-kernel@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>
Subject: RE: [PATCH v7 2/3] PCI: Enable PCIe Relaxed Ordering if supported

From: Casey Leedom
> Sent: 04 August 2017 21:49
...
> Whenever our Hardware Designers implement new functionality in our hardware,
> they almost always put in A. several "knobs" which can control fundamental
> parameters of the new Hardware Feature, and B.  a mechanism of completely
> disabling it if necessary.  This stems from the incredibly long Design ->
> Deployment cyle for Hardware (as opposed to the edit->compile->run cycle for s!

Indeed, I'd also expect there to be an undocumented flag to turn
it on (broken) in earlier parts to allow testing.

	David