From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.136]:32966 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751525AbcFUWFO (ORCPT ); Tue, 21 Jun 2016 18:05:14 -0400 Date: Tue, 21 Jun 2016 17:04:57 -0500 From: Bjorn Helgaas To: "Koehrer Mathias (ETAS/ESW5)" Cc: "gregkh@linuxfoundation.org" , "linux-pci@vger.kernel.org" , "bhelgaas@google.com" , "hjk@hansjkoch.de" Subject: Re: [PATCH] Extending kernel option pci=resource_alignment to be able to specify PCI device/vendor IDs Message-ID: <20160621220457.GD7603@localhost> References: <22400b8828ad44ddbccb876cc5ca3b11@FE-MBX1012.de.bosch.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <22400b8828ad44ddbccb876cc5ca3b11@FE-MBX1012.de.bosch.com> Sender: linux-pci-owner@vger.kernel.org List-ID: On Tue, Jun 07, 2016 at 02:24:17PM +0000, Koehrer Mathias (ETAS/ESW5) wrote: > Some uio based PCI drivers (e.g. uio_cif) do not work if the assigned > PCI memory resources are not page aligned. > By using the kernel option "pci=resource_alignment" it is possible to force > single PCI boards to use page alignment for their memory resources. > However, this is fairly cumbersome if multiple of these boards are in use as > the specification of the cards has to be done via PCI bus/slot/function number > which might change e.g. by adding another board. > This patch extends the kernel option "pci=resource_alignment" to allow to > specify the relevant boards via PCI device/vendor (and subdevice/subvendor) ids. > The specification of the devices via device/vendor is indicated by a leading > string "pci:" as argument to "pci=resource_alignment". > The format of the specification is > pci::[::] > > Signed-off-by: Mathias Koehrer > > --- > Documentation/kernel-parameters.txt | 2 + > drivers/pci/pci.c | 66 +++++++++++++++++++++++++----------- > 2 files changed, 49 insertions(+), 19 deletions(-) > > Index: linux-4.7-rc1/Documentation/kernel-parameters.txt > =================================================================== > --- linux-4.7-rc1.orig/Documentation/kernel-parameters.txt > +++ linux-4.7-rc1/Documentation/kernel-parameters.txt > @@ -2998,6 +2998,8 @@ bytes respectively. Such letter suffixes > resource_alignment= > Format: > [@][:]:.[; ...] > + [@]pci::\ > + [::][; ...] Can you include a little example here so we know whether to use "pci:8086:1234" or "pci:0x8086:0x1234"? Bjorn