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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 85763C433E5 for ; Wed, 22 Jul 2020 19:19:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CE91207E8 for ; Wed, 22 Jul 2020 19:19:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732596AbgGVTTs (ORCPT ); Wed, 22 Jul 2020 15:19:48 -0400 Received: from mga14.intel.com ([192.55.52.115]:65006 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726535AbgGVTTp (ORCPT ); Wed, 22 Jul 2020 15:19:45 -0400 IronPort-SDR: W0xhMCr/knPge3THpqBw1mbx+n0IZN3pb6tatfIs9p8ElDYAfvkqcCuqDDmh6Jk64dv3EYnAMb VhHUL8vbVp2Q== X-IronPort-AV: E=McAfee;i="6000,8403,9690"; a="149590054" X-IronPort-AV: E=Sophos;i="5.75,383,1589266800"; d="scan'208";a="149590054" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jul 2020 12:19:43 -0700 IronPort-SDR: hVzD5+/qvEXJqO5ErIpPN4LTK3KutmMl0RX9PIkAaLwkI5Zrx2qw9Mrl0G3UfL0uDZBjd/mzM7 oQ2iSCabtv0Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,383,1589266800"; d="scan'208";a="362811897" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga001.jf.intel.com with ESMTP; 22 Jul 2020 12:19:43 -0700 From: Jacob Pan To: iommu@lists.linux-foundation.org, LKML , "Lu Baolu" , Joerg Roedel , David Woodhouse Cc: Yi Liu , "Tian, Kevin" , Raj Ashok , Eric Auger , Jacob Pan Subject: [PATCH v5 3/7] iommu/vt-d: Fix PASID devTLB invalidation Date: Wed, 22 Jul 2020 12:26:23 -0700 Message-Id: <1595445987-40095-4-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595445987-40095-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1595445987-40095-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reviewed-by: Eric Auger --- 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..fa0154cce537 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 == 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); } void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev, -- 2.7.4