linux-kernel - Re: [PATCH 01/86] pci: export pci

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Date:	Mon, 30 Mar 2015 08:48:44 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jonathan Corbet <corbet@....net>,
	"David S. Miller" <davem@...emloft.net>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	stephen hemminger <stephen@...workplumber.org>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Stephane Eranian <eranian@...gle.com>,
	Huang Rui <ray.huang@....com>,
	Peter Neubauer <pneubauer@...erwhite.org>,
	linux-pci@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 01/86] pci: export pci_ids.h

On Sun, Mar 29, 2015 at 10:40:47PM +0200, Greg KH wrote:
> On Sun, Mar 29, 2015 at 03:37:01PM +0200, Michael S. Tsirkin wrote:
> > The macros in pci_ids.h are pretty useful for userspace
> > using the pci sysfs interface.
> > At the moment userspace is forced to duplicate these macros
> > (e.g. QEMU does this), it is better to expose them in
> > /usr/include/linux/pci_ids.h so everyone can just include
> > this header.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  include/linux/pci_ids.h      | 2998 +-----------------------------------------
> >  include/uapi/linux/pci_ids.h | 2997 +++++++++++++++++++++++++++++++++++++++++
> 
> No, please use the pci ids file from the upstream pci id database
> instead.


>  We shouldn't be putting these all in one file,

pci.txt says:
	Please add PCI_VENDOR_ID_xxx for vendors
You want to change this policy, and get rid of
vendor ids in pci_ids.h completely?
Bjorn, what do you think of this?

>  and pulling
> them out of drivers isn't ok.

This patchset is not pulling any files out of drivers fwiw.

> Userspace shouldn't need to know any of these, use libpci.

Unless I'm mistaken, libpci does not export a header with defines. It
has a text file pci.ids, but parsing that when all I want is e.g. locate
all intel devices is just too much overhead. No one wants that, so
people just duplicate headers.

Standard class IDs are even sillier to duplicate.


> thanks,
> 
> greg k-h
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