linux-kernel - Re: [PATCH 3/6] pci: add PCI quirk cmdmem fixup for Intel DSA device

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Date:   Wed, 1 Apr 2020 00:18:51 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     vkoul@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, bhelgaas@...gle.com,
        gregkh@...uxfoundation.org, arnd@...db.de,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        dmaengine@...r.kernel.org, dan.j.williams@...el.com,
        ashok.raj@...el.com, fenghua.yu@...el.com,
        linux-pci@...r.kernel.org, tony.luck@...el.com, jing.lin@...el.com,
        sanjay.k.kumar@...el.com
Subject: Re: [PATCH 3/6] pci: add PCI quirk cmdmem fixup for Intel DSA device

On Mon, Mar 30, 2020 at 02:27:06PM -0700, Dave Jiang wrote:
> Since there is no standard way that defines a PCI device that receives
> descriptors or commands with synchronous write operations, add quirk to set
> cmdmem for the Intel accelerator device that supports it.

Why do we need a quirk for this?  Even assuming a flag is needed in
struct pci_dev (and I don't really understand why that is needed to
start with), it could be set in ->probe.