linux-kernel - Re: [PATCH v12 0/6] Address error and recovery for AER and DPC

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Message-ID: <20180508192532.GA79697@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 8 May 2018 14:25:32 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Sinan Kaya <okaya@...eaurora.org>,
        Oza Pawandeep <poza@...eaurora.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dongdong Liu <liudongdong3@...wei.com>,
        Wei Zhang <wzhang@...com>, Timur Tabi <timur@...eaurora.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v12 0/6] Address error and recovery for AER and DPC

On Mon, Mar 12, 2018 at 05:26:26PM -0600, Keith Busch wrote:
> On Mon, Mar 12, 2018 at 02:47:30PM -0500, Bjorn Helgaas wrote:
> > On Mon, Mar 12, 2018 at 08:25:51AM -0600, Keith Busch wrote:

> > > Per spec, DPC is the recommended way for handling surprise removal
> > > events and even recommends DPC capable slots *not* set 'Surprise'
> > > in Slot Capabilities so that removals are always handled by DPC. This
> > > service driver was developed with that use in mind.
> > 
> > Thanks for this tip.  The only thing I've found so far is the mention
> > of Surprise Down triggering DPC in the last paragraph of sec 6.7.5.
> > Are there other references I should look at?  I haven't found the
> > recommendation about not setting 'Surprise' in Slot Capabilities yet.
> 
> No problem, it's in the "IMPLEMENTATION NOTE" at the end of 6.2.10.4,
> "Avoid Disabled Link and Hot-Plug Surprise Use with DPC".
> 
> Outside the spec, Microsemi as one of the PCI-SIG contributors and early
> adopters of the capability published a white paper "Hot and Surprise
> Plug Recommendations for Enterprise PCIe" providing guidance for OS
> drivers using DPC. We originally developed to that guidance. The paper
> unfortunately appears to be pay-walled now. :(

Any chance you have a URL or contact info for this pay-walled white
paper?  Sounds like it might have useful information in it.