Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754426Ab3JBVIu (ORCPT ); Wed, 2 Oct 2013 17:08:50 -0400 Received: from co1ehsobe006.messaging.microsoft.com ([216.32.180.189]:5663 "EHLO co1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754165Ab3JBVIt (ORCPT ); Wed, 2 Oct 2013 17:08:49 -0400 X-Forefront-Antispam-Report: CIP:70.37.183.190;KIP:(null);UIP:(null);IPV:NLI;H:mail.freescale.net;RD:none;EFVD:NLI X-SpamScore: -3 X-BigFish: VS-3(zz98dI936eI1432Izz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6hzz1de098h1de097h8275dhz2dh2a8h839h93fhd24hf0ah1288h12a5h12a9h12bdh137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h1155h) Message-ID: <1380748121.12932.89.camel@snotra.buserror.net> Subject: Re: RFC: (re-)binding the VFIO platform driver to a platform device From: Scott Wood To: "gregkh@linuxfoundation.org" CC: Christoffer Dall , Yoder Stuart-B08248 , Alex Williamson , Kim Phillips , "linux-kernel@vger.kernel.org" , "a.motakis@virtualopensystems.com" , "agraf@suse.de" , Wood Scott-B07421 , Sethi Varun-B16395 , Bhushan Bharat-R65777 , "peter.maydell@linaro.org" , "santosh.shukla@linaro.org" , "kvm@vger.kernel.org" Date: Wed, 2 Oct 2013 16:08:41 -0500 In-Reply-To: <20131002203735.GA10871@kroah.com> References: <20131001133831.6e46e8e00e09d5d9079fde57@linaro.org> <20131001200054.GA27330@kroah.com> <20131001170244.ff4fb81d9a7a09598c4c6247@linaro.org> <20131002015355.GD63102@lvm> <1380681356.14271.57.camel@ul30vt.home> <20131002151413.GG63102@lvm> <9F6FE96B71CF29479FF1CDC8046E15036D405D@039-SN1MPN1-003.039d.mgd.msft.net> <1380738758.12932.43.camel@snotra.buserror.net> <20131002184330.GC5108@cbox> <20131002203735.GA10871@kroah.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.6.4-0ubuntu1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1334 Lines: 32 On Wed, 2013-10-02 at 13:37 -0700, gregkh@linuxfoundation.org wrote: > On Wed, Oct 02, 2013 at 11:43:30AM -0700, Christoffer Dall wrote: > > > What's wrong with a non-vfio-specific flag that a driver can set, that > > > indicates that the driver is willing to try to bind to any device on the > > > bus if explicitly requested via the existing sysfs bind mechanism? > > > > > It sounds more hackish to me to invent some 'generic' flag to solve a > > very specific case. What you're suggesting would let users specify that > > a serial driver should handle a NIC hardware, no? That sounds much much > > worse to me. > > You can do that today, with any PCI driver (or USB driver as well), just > use the bind/unbind files in sysfs and you had better "know" what you > are doing... sysfs bind won't work if it driver_match_device() fails. PCI has PCI_ANY_ID, so the missing piece for PCI is a way to say that the driver should not bind to a device except when explicitly requested via sysfs bind. I don't see any equivalent functionality to PCI_ANY_ID for platform devices. -Scott -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/