From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753216AbcFHAXn (ORCPT ); Tue, 7 Jun 2016 20:23:43 -0400 Received: from galahad.ideasonboard.com ([185.26.127.97]:42802 "EHLO galahad.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751125AbcFHAXm (ORCPT ); Tue, 7 Jun 2016 20:23:42 -0400 From: Laurent Pinchart To: Magnus Damm Cc: iommu@lists.linux-foundation.org, laurent.pinchart+renesas@ideasonboard.com, geert+renesas@glider.be, joro@8bytes.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, horms+renesas@verge.net.au Subject: Re: [PATCH v2 06/11] iommu/ipmmu-vmsa: Teach xlate() to skip disabled iommus Date: Wed, 08 Jun 2016 03:23:54 +0300 Message-ID: <9580255.XWMtPoN9Mj@avalon> User-Agent: KMail/4.14.10 (Linux/4.4.6-gentoo; KDE/4.14.16; x86_64; ; ) In-Reply-To: <20160606035822.31763.39713.sendpatchset@little-apple> References: <20160606035723.31763.66500.sendpatchset@little-apple> <20160606035822.31763.39713.sendpatchset@little-apple> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Magnus, Thank you for the patch. I agree with the comment that Geert made on v1, and I haven't seen you replying to it or addressing it. Quoting Geert, "I think this should be handled in drivers/iommu/of_iommu.c:of_iommu_init() instead, cfr. commit 3e5dd6f6e690048d ("clk: Ignore disabled DT clock providers")." On Monday 06 Jun 2016 12:58:22 Magnus Damm wrote: > From: Magnus Damm > > The ->xlate() call gets invoked even though the iommu > device has status = "disabled" in DT, so make sure we > skip over disabled devices. > > In my mind it would make sense to have this at some > shared level, but I guess some users may want to > configure the iommu regardless of DT state. > > Signed-off-by: Magnus Damm > --- > > Changes since V1: > - Reworked slightly to fit on top of updated patch order > > drivers/iommu/ipmmu-vmsa.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > --- 0017/drivers/iommu/ipmmu-vmsa.c > +++ work/drivers/iommu/ipmmu-vmsa.c 2016-06-06 10:58:18.530607110 +0900 > @@ -1001,7 +1001,13 @@ static struct iommu_group *ipmmu_device_ > static int ipmmu_of_xlate_dma(struct device *dev, > struct of_phandle_args *spec) > { > - /* dummy callback to satisfy of_iommu_configure() */ > + /* If the IPMMU device is disabled in DT then return error > + * to make sure the of_iommu code does not install ops > + * even though the iommu device is disabled > + */ > + if (!of_device_is_available(spec->np)) > + return -ENODEV; > + > return 0; > } -- Regards, Laurent Pinchart