linux-kernel - Re: [PATCH 0/3] add dynamic PCI device of

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Date:   Tue, 10 May 2022 00:22:11 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        Thomas Petazzoni <thomas.petazonni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Mark Brown <broonie@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Andrew Lunn <andrew@...n.ch>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 0/3] add dynamic PCI device of_node creation for overlay

On Mon, May 09, 2022 at 10:40:12PM +0200, Andy Shevchenko wrote:
> > hotpluggable card?  Do the systems that you anticipate plugging the
> > card into support hotplug?
> 
> Any PCIe card is potentially hotpluggable (seems nobody actually cares
> in 90%+ drivers in the Linux kernel). But what I have heard in a
> thread (not this one IIRC) is that the card may have pluggable modules
> and it would be nice to change configuration and notify OS somehow. I
> might be mistaken if it's the case here or not.

Well.  M.2 for example is not hotpluggable, as are soldered on BGA
devices or a lot of not quite PCIe devices that actually sit on CPUs
or shipset components.  But for all but the last category an upstream
bridge could still be hot plugged, so not supporting it in drivers is
indeed generally speaking a bad idea.