linux-kernel - Re: [PATCH v2 2/2] pci: Support "removable" attribute for PCI devices

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Message-ID: <21c6b5002c5ad36cd7fe0bb849f5eba12a614bca.camel@suse.com>
Date:   Tue, 27 Apr 2021 13:59:52 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     David Laight <David.Laight@...LAB.COM>,
        "'Rafael J. Wysocki'" <rafael@...nel.org>
Cc:     Rajat Jain <rajatja@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
        <linux-usb@...r.kernel.org>, Bjorn Helgaas <helgaas@...nel.org>,
        Rajat Jain <rajatxjain@...il.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Dmitry Torokhov <dtor@...gle.com>
Subject: Re: [PATCH v2 2/2] pci: Support "removable" attribute for PCI
 devices

Am Montag, den 26.04.2021, 13:01 +0000 schrieb David Laight:
> From: Rafael J. Wysocki
> > Sent: 26 April 2021 12:49
> > 
> > On Mon, Apr 26, 2021 at 11:17 AM Oliver Neukum <oneukum@...e.com> wrote:
> > > Am Freitag, den 23.04.2021, 19:16 -0700 schrieb Rajat Jain:
> > > > Export the already available info, to the userspace via the
> > > > device core, so that userspace can implement whatever policies it
> > > > wants to, for external removable devices.
> > > 
> > > Hi,
> > > 
> > > is there a way to tell apart whether a device can undergo regular
> > > surprise removal?
> > 
> > PCI devices located under a removable parent can undergo surprise
> > removal.  The ones on a Thunderbolt chain too.
> > 
> > > Do we want that?
> > 
> > Do you mean surprise removal?  Yes, we do.
> 
> Always been true - think of cardbus (PCI pcmcia) cards with
> PCI bridges to external PCI expansion chassis containing
> additional PCI slots.
> The cardbus card is hot removable.

Hi,

that is true for those options, but not for the style
of PCI hotplug which requires you to push a button and wait
for the blinking light.

	REgards
		Oliver