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Subject: Re: [PATCH v2 2/2] pci: Support "removable" attribute for PCI
 devices
From:   Oliver Neukum <oneukum@suse.com>
To:     David Laight <David.Laight@ACULAB.COM>,
        "'Rafael J. Wysocki'" <rafael@kernel.org>
Cc:     Rajat Jain <rajatja@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux PCI <linux-pci@vger.kernel.org>,
        "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
        <linux-usb@vger.kernel.org>, Bjorn Helgaas <helgaas@kernel.org>,
        Rajat Jain <rajatxjain@gmail.com>,
        Jesse Barnes <jsbarnes@google.com>,
        Dmitry Torokhov <dtor@google.com>
Date:   Tue, 27 Apr 2021 13:59:52 +0200
In-Reply-To: <79b994f2476249498797e1784f735fd7@AcuMS.aculab.com>
References: <20210424021631.1972022-1-rajatja@google.com>
         <20210424021631.1972022-2-rajatja@google.com>
         <d53c72949d81db9f092a9aecb49bf56b47727738.camel@suse.com>
         <CAJZ5v0iNrSFjhmTE8K-JrO07kJon3ikhatbg0Jg2hs+x-frDJg@mail.gmail.com>
         <79b994f2476249498797e1784f735fd7@AcuMS.aculab.com>
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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@suse.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