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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 036EEC43603 for ; Wed, 18 Dec 2019 03:26:26 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 CA60B206EE for ; Wed, 18 Dec 2019 03:26:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CA60B206EE 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 fraxinus.osuosl.org (Postfix) with ESMTP id 9808785F3E; Wed, 18 Dec 2019 03:26:25 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bo-xERtRyFZa; Wed, 18 Dec 2019 03:26:25 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 1B31585AF1; Wed, 18 Dec 2019 03:26:25 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 0579AC1D7D; Wed, 18 Dec 2019 03:26:25 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 98179C077D for ; Wed, 18 Dec 2019 03:26:23 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 8445588360 for ; Wed, 18 Dec 2019 03:26:23 +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 yd8zZ3YQ7npY for ; Wed, 18 Dec 2019 03:26:23 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by hemlock.osuosl.org (Postfix) with ESMTPS id DF84188356 for ; Wed, 18 Dec 2019 03:26:22 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Dec 2019 19:26:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,328,1571727600"; d="scan'208";a="227721983" Received: from allen-box.sh.intel.com (HELO [10.239.159.136]) ([10.239.159.136]) by orsmga002.jf.intel.com with ESMTP; 17 Dec 2019 19:26:20 -0800 Subject: Re: [PATCH v8 06/10] iommu/vt-d: Cache virtual command capability register To: Jacob Pan , iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse References: <1576524252-79116-1-git-send-email-jacob.jun.pan@linux.intel.com> <1576524252-79116-7-git-send-email-jacob.jun.pan@linux.intel.com> From: Lu Baolu Message-ID: <0f704b87-aad7-c864-91ac-423a05287f21@linux.intel.com> Date: Wed, 18 Dec 2019 11:25:27 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.1 MIME-Version: 1.0 In-Reply-To: <1576524252-79116-7-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" Hi, On 12/17/19 3:24 AM, Jacob Pan wrote: > Virtual command registers are used in the guest only, to prevent > vmexit cost, we cache the capability and store it during initialization. > > Signed-off-by: Jacob Pan > --- > drivers/iommu/dmar.c | 1 + > include/linux/intel-iommu.h | 4 ++++ > 2 files changed, 5 insertions(+) > > diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c > index f2f5d75da94a..3f98dd9ad004 100644 > --- a/drivers/iommu/dmar.c > +++ b/drivers/iommu/dmar.c > @@ -953,6 +953,7 @@ static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) > warn_invalid_dmar(phys_addr, " returns all ones"); > goto unmap; > } > + iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG); > > /* the registers might be more than one page */ > map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), > diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h > index ee26989df008..4d25141ec3df 100644 > --- a/include/linux/intel-iommu.h > +++ b/include/linux/intel-iommu.h > @@ -189,6 +189,9 @@ > #define ecap_max_handle_mask(e) ((e >> 20) & 0xf) > #define ecap_sc_support(e) ((e >> 7) & 0x1) /* Snooping Control */ > > +/* Virtual command interface capabilities */ > +#define vccap_pasid(v) ((v & DMA_VCS_PAS)) /* PASID allocation */ Has DMA_VCS_PAS ever been defined? Best regards, baolu > + > /* IOTLB_REG */ > #define DMA_TLB_FLUSH_GRANU_OFFSET 60 > #define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60) > @@ -531,6 +534,7 @@ struct intel_iommu { > u64 reg_size; /* size of hw register set */ > u64 cap; > u64 ecap; > + u64 vccap; > u32 gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */ > raw_spinlock_t register_lock; /* protect register handling */ > int seq_id; /* sequence id of the iommu */ > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu