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: 11558281 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 5639013B1 for ; Tue, 19 May 2020 18:01:47 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 16BC0207E8 for ; Tue, 19 May 2020 18:01:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="v3uSYjcT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16BC0207E8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B547C900002; Tue, 19 May 2020 14:01:45 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id ADE4480008; Tue, 19 May 2020 14:01:45 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 92E9D900003; Tue, 19 May 2020 14:01:45 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0230.hostedemail.com [216.40.44.230]) by kanga.kvack.org (Postfix) with ESMTP id 77752900002 for ; Tue, 19 May 2020 14:01:45 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 2F26B3499 for ; Tue, 19 May 2020 18:01:45 +0000 (UTC) X-FDA: 76834236570.27.waves65_2c5b7739a4243 X-Spam-Summary: 2,0,0,4ede08c4b0719dc6,d41d8cd98f00b204,jean-philippe@linaro.org,,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1311:1314:1345:1359:1437:1515:1534:1541:1711:1730:1747:1777:1792:2393:2559:2562:2901:3138:3139:3140:3141:3142:3352:3865:3866:3867:3870:3871:3874:4250:4321:5007:6261:6653:6742:7903:10004:11026:11473:11658:11914:12048:12296:12297:12438:12517:12519:12555:12895:12986:13069:13138:13141:13230:13231:13311:13357:13894:14096:14181:14384:14394:14721:21080:21222:21444:21627:21740:30003:30054:30055:30080,0,RBL:209.85.221.67:@linaro.org:.lbl8.mailshell.net-66.100.201.201 62.2.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: waves65_2c5b7739a4243 X-Filterd-Recvd-Size: 4483 Received: from mail-wr1-f67.google.com (mail-wr1-f67.google.com [209.85.221.67]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Tue, 19 May 2020 18:01:44 +0000 (UTC) Received: by mail-wr1-f67.google.com with SMTP id h17so387789wrc.8 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=tEsZ89dQxrAb+JpR10MD9ZKLPQ4L5VEsjPpMX24QJk4ZoOOdN+7V51EY6aN/PC6u+2 XQ7bapbMFfN/i4YMjJGKpUWjvVQB/09VDwQbtWuclbFmsg0MlBIbmnTFQ6PTsIZypqXs XAIQpeqKEbYvTY1gSrW06h6FHTrYcICGHyPgcNMmTlVeD3mQbXQ820XY6JO+MWcqo9/L rPNX5nUlwnvnPkYhvA8YmydJkY8vY9hkERc6AEfehYY0VBrqT5+KqZpxuSNDeAuEVZIP zw4e2wp7nRp4RgUe+9zTtdXTZAO4GZuntoDbmI2URpNKMpCNzH2zmXqqEUJQ3jnij7+A w4ZA== X-Gm-Message-State: AOAM5318LrUYOXnEFFEicTnasBWERTfXRMoHemGb3uZkQIRl6tEKSEfh 23+gvD8kgX2RHXIcFihJf9fUow== 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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; /*