From patchwork Tue May 19 17:54:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 11558279 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AC95213B1 for ; Tue, 19 May 2020 18:01:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9559C20826 for ; Tue, 19 May 2020 18:01:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="v3uSYjcT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726946AbgESSBp (ORCPT ); Tue, 19 May 2020 14:01:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726059AbgESSBo (ORCPT ); Tue, 19 May 2020 14:01:44 -0400 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3572AC08C5C0 for ; Tue, 19 May 2020 11:01:44 -0700 (PDT) Received: by mail-wr1-x441.google.com with SMTP id l11so447688wru.0 for ; Tue, 19 May 2020 11:01:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=GyR/0Ui23R5AHEgwKIBkr1oNL8Gb0ETBbsB9Bvf72kY=; b=v3uSYjcTrWI5/qXsAKPtQitwafYDySNKobI2mT1/dgOS6rzcfLNMmKF8Zt+y0lAIG+ 7NlQH+xDT61+aKM9dVrX/ST+T5q9rAVx5upfWAkNFK1yIBfi0CAVIN2p765NEfOSC08U sFwBSa6m6vidPtQ10csw1xhsYdtx+Clr66gxG7w/lPymxvLly5LhE7Um5QY8fQhUpWaJ xdgGAMGjYoX5ObjkOmVHefDcNQj8HEkXT7/nacUbxTsEOjESUGfhUPoGor1ifWuorzlX L6qNerDYVI4QEctFS67Z/P9rCH1XE1xvD8PSxU2aJEL1im0fmYXq7/33gxfnNONbYidw T/Fw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=GyR/0Ui23R5AHEgwKIBkr1oNL8Gb0ETBbsB9Bvf72kY=; b=V6Xb+X6DYdask+E/ZHUUmVusBI0RJ8W5Lzr5oX7fglzh1H6/OUHLdQOvlHr8mDvmW2 clT4PIJk/EM/shQWyNfjJOwHqlesh0iO7YgQfpXQI9QdqrNJuK8kCidsuSp1lCjAU/VY jOlmUL6YpeWWUCRicqFc8C7dtv6jiDE9zjQ5/OF9riUPjYBEnh/YnedzgMAyGC0BBBZ6 Bessy8DbkSyaTZ8/ef7zO7PseV7aLfdN8cmP00/QcLhMqRtaGRZSqPlXvBoyeoxakgcT HFmj43VSeTCkn3OyxwIZjobdV6MTzb+GSM2SRlqkMaWoL24eQXi31/hFjcRQweLFSop/ MIiw== X-Gm-Message-State: AOAM533K2GgmHyMwTy91AS4+I6c3/oNH/EuAc71pQqt5GyvM/hVprQS/ U+FIKDzrZD+yHPCP6Q0FXEklQw== X-Google-Smtp-Source: ABdhPJyPXdWabIumTknX9KHGpAfZMDP+D+8kcHDQrtNtnJy5wEFWx5RISo0BU/ne7okq5g9/m6U84w== X-Received: by 2002:a5d:694d:: with SMTP id r13mr112031wrw.238.1589911302937; Tue, 19 May 2020 11:01:42 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226e:c200:c43b:ef78:d083:b355]) by smtp.gmail.com with ESMTPSA id 1sm510496wmz.13.2020.05.19.11.01.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2020 11:01:42 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: joro@8bytes.org, catalin.marinas@arm.com, will@kernel.org, robin.murphy@arm.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, felix.kuehling@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, fenghua.yu@intel.com, hch@infradead.org, Jean-Philippe Brucker Subject: [PATCH v7 01/24] mm: Add a PASID field to mm_struct Date: Tue, 19 May 2020 19:54:39 +0200 Message-Id: <20200519175502.2504091-2-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200519175502.2504091-1-jean-philippe@linaro.org> References: <20200519175502.2504091-1-jean-philippe@linaro.org> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Some devices can tag their DMA requests with a 20-bit Process Address Space ID (PASID), allowing them to access multiple address spaces. In combination with recoverable I/O page faults (for example PCIe PRI), PASID allows the IOMMU to share page tables with the MMU. To make sure that a single PASID is allocated for each address space, as required by Intel ENQCMD, store the PASID in the mm_struct. The IOMMU driver is in charge of serializing modifications to the PASID field. Signed-off-by: Jean-Philippe Brucker --- 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 4aba6c0c2ba8..8db647275817 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -534,6 +534,10 @@ struct mm_struct { atomic_long_t hugetlb_usage; #endif struct work_struct async_put_work; +#ifdef CONFIG_IOMMU_SUPPORT + /* Address space ID used by device DMA */ + unsigned int pasid; +#endif } __randomize_layout; /*