From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH v3 5/7] iommu: avoid dev iotlb logic in intel-iommu for domains with no dev iotlbs Date: Tue, 19 Apr 2016 15:09:27 -0400 Message-ID: <1461092967.25115.7.camel@infradead.org> References: <20d0571ab8dda05bd3980b18df0a810fb26480e4.1460733778.git.mad@cs.technion.ac.il> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8967080457629134516==" Return-path: In-Reply-To: <20d0571ab8dda05bd3980b18df0a810fb26480e4.1460733778.git.mad-FrESSTt7Abv7r6psnUbsSmZHpeb/A1Y/@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Adam Morrison , joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: serebrin-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, dan-FrESSTt7Abv7r6psnUbsSmZHpeb/A1Y/@public.gmane.org, omer-FrESSTt7Abv7r6psnUbsSmZHpeb/A1Y/@public.gmane.org, shli-b10kYP2dOMg@public.gmane.org, gvdl-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, Kernel-team-b10kYP2dOMg@public.gmane.org List-Id: iommu@lists.linux-foundation.org --===============8967080457629134516== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-QRnHFU0NqovGB8UOx5PV" --=-QRnHFU0NqovGB8UOx5PV Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2016-04-19 at 19:49 +0300, Adam Morrison wrote: > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -392,6 +392,7 @@ struct dmar_domain { > =C2=A0 =C2=A0* to VT-d spec, section 9.3 */ > =C2=A0 > =C2=A0 struct list_head devices; /* all devices' list */ > + bool has_iotlb_device; If you put that *before* the 'devices' field then the array will pack better. > @@ -1523,6 +1553,9 @@ static void iommu_flush_dev_iotlb(struct dmar_domai= n *domain, > =C2=A0 unsigned long flags; > =C2=A0 struct device_domain_info *info; > =C2=A0 > + if (!domain->has_iotlb_device) > + return; > + > =C2=A0 spin_lock_irqsave(&device_domain_lock, flags); > =C2=A0 list_for_each_entry(info, &domain->devices, link) { > =C2=A0 if (!info->ats_enabled) >=20 Hm, I wonder if it would be nicer to check this in the caller (both of them). As things stand, in flush_unmaps() we'll now be calculating ilog2(nrpages) for (possibly) no reason before calling this function. Other than that, this all looks excellent; thanks. I'll apply it when I get home from LSF/MM later this week or next. Only a few cosmetic things to change =E2=80=94 please use 'iommu/vt-d:' as = the prefix on each commit, and spell 'MiB' and 'KiB' correctly in the final patch in the series. 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