linux-kernel - Re: Device driver location for the PCIe root port's DMA engine

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Message-ID: <20210413190509.GA2256814@bjorn-Precision-5520>
Date:   Tue, 13 Apr 2021 14:05:09 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     Matthew Wilcox <willy@...radead.org>, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, amurray@...goodpenguin.co.uk,
        robh@...nel.org, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, Krishna Thota <kthota@...dia.com>,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: Device driver location for the PCIe root port's DMA engine

On Tue, Apr 13, 2021 at 11:42:15PM +0530, Vidya Sagar wrote:
> On 4/13/2021 3:23 AM, Bjorn Helgaas wrote:

> > The existing port services (AER, DPC, hotplug, etc) are things the
> > device advertises via the PCI Capabilities defined by the generic PCIe
> > spec, and in my opinion the support for them should be directly part
> > of the PCI core and activated when the relevant Capability is present.
> Is there an on-going activity to remove port service drivers are move
> AER/DPC/Hotplug etc.. handling within PCI core?

No, not that I'm aware of.  I'd just like to avoid extending that
model.

Bjorn