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=-12.8 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=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 A38B8C433E1 for ; Thu, 27 Aug 2020 15:07:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A0CE22D02 for ; Thu, 27 Aug 2020 15:07:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728147AbgH0PHn (ORCPT ); Thu, 27 Aug 2020 11:07:43 -0400 Received: from mga17.intel.com ([192.55.52.151]:30258 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728333AbgH0PHO (ORCPT ); Thu, 27 Aug 2020 11:07:14 -0400 IronPort-SDR: hEEet2v6UNe2UEYvdtSPqln2TuYNuaivlczHhJKG6pMDTtU1702FYHlzIzDhy8zIdaN9w918c+ fA3sZfxl/T3Q== X-IronPort-AV: E=McAfee;i="6000,8403,9726"; a="136563653" X-IronPort-AV: E=Sophos;i="5.76,359,1592895600"; d="scan'208";a="136563653" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Aug 2020 08:06:59 -0700 IronPort-SDR: Xg7voNoK5fZYuKFbJjlFDUYuGwghawCJyVA/W+yRYt3yxL+IngxtuYFfxWcY3uZCFHzrI4y+4y at7uvxqs31ZA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,359,1592895600"; d="scan'208";a="332212867" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by fmsmga002.fm.intel.com with ESMTP; 27 Aug 2020 08:06:59 -0700 From: Fenghua Yu To: "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "H Peter Anvin" , "Andy Lutomirski" , "Jean-Philippe Brucker" , "Christoph Hellwig" , "Peter Zijlstra" , "David Woodhouse" , "Lu Baolu" , "Dave Hansen" , "Tony Luck" , "Ashok Raj" , "Jacob Jun Pan" , "Dave Jiang" , "Sohil Mehta" , "Ravi V Shankar" Cc: "linux-kernel" , "x86" , iommu@lists.linux-foundation.org, Fenghua Yu Subject: [PATCH v7 7/9] mm: Define pasid in mm Date: Thu, 27 Aug 2020 08:06:32 -0700 Message-Id: <1598540794-132666-8-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1598540794-132666-1-git-send-email-fenghua.yu@intel.com> References: <1598540794-132666-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PASID is shared by all threads in a process. So the logical place to keep track of it is in the "mm". Both ARM and X86 need to use the PASID in the "mm". Suggested-by: Christoph Hellwig Signed-off-by: Fenghua Yu Reviewed-by: Tony Luck --- v4: - Change PASID type to u32 (Christoph) v3: - Change CONFIG_PCI_PASID to CONFIG_IOMMU_SUPPORT because non-PCI device can have PASID in ARM (Jean) v2: - This new patch moves "pasid" from x86 specific mm_context_t to generic struct mm_struct per Christopher's comment: https://lore.kernel.org/linux-iommu/20200414170252.714402-1-jean-philippe@linaro.org/T/#mb57110ffe1aaa24750eeea4f93b611f0d1913911 - Jean-Philippe Brucker released a virtually same patch. I still put this patch in the series for better review. The upstream kernel only needs one of the two patches eventually. https://lore.kernel.org/linux-iommu/20200519175502.2504091-2-jean-philippe@linaro.org/ - Change CONFIG_IOASID to CONFIG_PCI_PASID (Ashok) include/linux/mm_types.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 496c3ff97cce..1ff0615ef19f 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -542,6 +542,10 @@ struct mm_struct { atomic_long_t hugetlb_usage; #endif struct work_struct async_put_work; + +#ifdef CONFIG_IOMMU_SUPPORT + u32 pasid; +#endif } __randomize_layout; /* -- 2.19.1