From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDB3BC433DF for ; Thu, 25 Jun 2020 07:26:03 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 89DB6206C3 for ; Thu, 25 Jun 2020 07:26:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 89DB6206C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 532D9886B9; Thu, 25 Jun 2020 07:26:03 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s3hX1Ud9kKyw; Thu, 25 Jun 2020 07:26:02 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 90D45880C3; Thu, 25 Jun 2020 07:26:02 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 75575C0863; Thu, 25 Jun 2020 07:26:02 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 96D72C016F for ; Thu, 25 Jun 2020 07:26:01 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 6FC78220CA for ; Thu, 25 Jun 2020 07:26:01 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id j-jUWNExFVUz for ; Thu, 25 Jun 2020 07:26:00 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by silver.osuosl.org (Postfix) with ESMTPS id CC40020354 for ; Thu, 25 Jun 2020 07:26:00 +0000 (UTC) IronPort-SDR: u80whQ8lWW0jyNkOH0SRTjtingUm+VG5wiVK8X1uOMuwRToU+eUA/p4CzqwaBkcFEGxzYf0zzw q6eUIJPktFHw== X-IronPort-AV: E=McAfee;i="6000,8403,9662"; a="162862430" X-IronPort-AV: E=Sophos;i="5.75,278,1589266800"; d="scan'208";a="162862430" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jun 2020 00:26:00 -0700 IronPort-SDR: skxswrzadjS9O6A4J+XNGnx1Ra3RnQjdSoBVaG5WvCCw85RfUno6gSshMK/FcU9iTR4kmWaU+E fnupydAr06nQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,278,1589266800"; d="scan'208";a="263858985" Received: from yijiangw-mobl1.ccr.corp.intel.com (HELO [10.255.28.52]) ([10.255.28.52]) by fmsmga007.fm.intel.com with ESMTP; 25 Jun 2020 00:25:58 -0700 Subject: Re: [PATCH 3/7] iommu/vt-d: Fix PASID devTLB invalidation To: Jacob Pan , iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse References: <1592926996-47914-1-git-send-email-jacob.jun.pan@linux.intel.com> <1592926996-47914-4-git-send-email-jacob.jun.pan@linux.intel.com> From: Lu Baolu Message-ID: <57091f4a-fb53-40a4-6a28-a498f548f8b8@linux.intel.com> Date: Thu, 25 Jun 2020 15:25:57 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <1592926996-47914-4-git-send-email-jacob.jun.pan@linux.intel.com> Content-Language: en-US Cc: "Tian, Kevin" , Raj Ashok X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2020/6/23 23:43, Jacob Pan wrote: > DevTLB flush can be used for both DMA request with and without PASIDs. > The former uses PASID#0 (RID2PASID), latter uses non-zero PASID for SVA > usage. > > This patch adds a check for PASID value such that devTLB flush with > PASID is used for SVA case. This is more efficient in that multiple > PASIDs can be used by a single device, when tearing down a PASID entry > we shall flush only the devTLB specific to a PASID. > > Fixes: 6f7db75e1c46 ("iommu/vt-d: Add second level page table") > Signed-off-by: Jacob Pan > --- > drivers/iommu/intel/pasid.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c > index c81f0f17c6ba..3991a24539a1 100644 > --- a/drivers/iommu/intel/pasid.c > +++ b/drivers/iommu/intel/pasid.c > @@ -486,7 +486,16 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu, > qdep = info->ats_qdep; > pfsid = info->pfsid; > > - qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT); > + /* > + * When PASID 0 is used, it indicates RID2PASID(DMA request w/o PASID), > + * devTLB flush w/o PASID should be used. For non-zero PASID under > + * SVA usage, device could do DMA with multiple PASIDs. It is more > + * efficient to flush devTLB specific to the PASID. > + */ > + if (pasid) How about if (pasid == PASID_RID2PASID) qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT); else qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT); ? It makes the code more readable and still works even we reassign another pasid for RID2PASID. Best regards, baolu > + qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT); > + else > + qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT); > } > > void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev, > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu