From patchwork Thu Apr 22 08:14:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12217895 X-Patchwork-Delegate: bhelgaas@google.com 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 BD21EC433B4 for ; Thu, 22 Apr 2021 08:15:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 926CB613C3 for ; Thu, 22 Apr 2021 08:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235411AbhDVIQ3 (ORCPT ); Thu, 22 Apr 2021 04:16:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235408AbhDVIQ2 (ORCPT ); Thu, 22 Apr 2021 04:16:28 -0400 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D730C06138E for ; Thu, 22 Apr 2021 01:15:53 -0700 (PDT) Received: by mail-pj1-x102c.google.com with SMTP id j6-20020a17090adc86b02900cbfe6f2c96so531220pjv.1 for ; Thu, 22 Apr 2021 01:15:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=k4dyB3xlmvkfx6+ggy7Uv640xgq260Lfsxi7yqvhCZI=; b=kLFGcuOQrccDqfD9J76t1/kDLyymEf5QZdonwnYtBNPLHycZjLGV1OskzqU8d8CBT2 dFZ2kyndUcgD1g6WATSmnvKXnlXdau6lSM6AakeoAvt1oeObRayZc+uNuTgzJ9Ur1iuG 1ryoegnb2fqqmY98GaQlrYL4hIv1GoXoL11Cg= 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=k4dyB3xlmvkfx6+ggy7Uv640xgq260Lfsxi7yqvhCZI=; b=BvTu0yxgDPSyeUBCZO/5Fz44jwpvwXhKkWMyiE4g0B+kX9opj0oI+FIOqlXfjJkiuF uLz7n9ee+3eg0gDOh0Wz4rTtbOoE9PtAbdJKuRqNa5eT+Dz6gPtC6E36fYhn9m9gAqf3 yPgUK20mY8q1JgGLo3AihilBrsFrhQT8X4M+RnJpiDp3ZmzMHyDwTODrIBwpeSlQIIRT HswhLXWLJttlClWDAumaeCDmVKlH4+bVJI1Y2BmKOESj695CWTtf+xtNANQPNpC2s8dK owZHzz9Kf9hmhXf0CP7Ts+9ebn761N7oaGJ/5CnkvxYCloXUuQOWkQ/5+cUzFGHPSP+p cvAw== X-Gm-Message-State: AOAM530dP9Vw6nRtiDtWla/XlTcde+jG/f5kRpkwRKVnU1rxzdltRI5G rHWIxtkDVQsdB/8/oMqYZ7tQAQ== X-Google-Smtp-Source: ABdhPJzaPOcvkpo4oh1A/JsjcQqzOO/tc1NI/mmGYHMg9yfM2pWhcv0q011OgU/0UUPri4B/30xsPg== X-Received: by 2002:a17:90b:14c4:: with SMTP id jz4mr2772455pjb.144.1619079353175; Thu, 22 Apr 2021 01:15:53 -0700 (PDT) Received: from localhost ([2401:fa00:1:10:1a8e:1bde:f79e:c302]) by smtp.gmail.com with UTF8SMTPSA id bk6sm4233324pjb.10.2021.04.22.01.15.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Apr 2021 01:15:52 -0700 (PDT) From: Claire Chang To: Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski Cc: benh@kernel.crashing.org, paulus@samba.org, "list@263.net:IOMMU DRIVERS" , sstabellini@kernel.org, Robin Murphy , grant.likely@arm.com, xypron.glpk@gmx.de, Thierry Reding , mingo@kernel.org, bauerman@linux.ibm.com, peterz@infradead.org, Greg KH , Saravana Kannan , "Rafael J . Wysocki" , heikki.krogerus@linux.intel.com, Andy Shevchenko , Randy Dunlap , Dan Williams , Bartosz Golaszewski , linux-devicetree , lkml , linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org, Nicolas Boichat , Jim Quinlan , tfiga@chromium.org, bskeggs@redhat.com, bhelgaas@google.com, chris@chris-wilson.co.uk, tientzu@chromium.org, daniel@ffwll.ch, airlied@linux.ie, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, jxgao@google.com, joonas.lahtinen@linux.intel.com, linux-pci@vger.kernel.org, maarten.lankhorst@linux.intel.com, matthew.auld@intel.com, nouveau@lists.freedesktop.org, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v5 04/16] swiotlb: Add DMA_RESTRICTED_POOL Date: Thu, 22 Apr 2021 16:14:56 +0800 Message-Id: <20210422081508.3942748-5-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.368.gbe11c130af-goog In-Reply-To: <20210422081508.3942748-1-tientzu@chromium.org> References: <20210422081508.3942748-1-tientzu@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add a new kconfig symbol, DMA_RESTRICTED_POOL, for restricted DMA pool. Signed-off-by: Claire Chang --- kernel/dma/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig index 77b405508743..3e961dc39634 100644 --- a/kernel/dma/Kconfig +++ b/kernel/dma/Kconfig @@ -80,6 +80,20 @@ config SWIOTLB bool select NEED_DMA_MAP_STATE +config DMA_RESTRICTED_POOL + bool "DMA Restricted Pool" + depends on OF && OF_RESERVED_MEM + select SWIOTLB + help + This enables support for restricted DMA pools which provide a level of + DMA memory protection on systems with limited hardware protection + capabilities, such as those lacking an IOMMU. + + For more information see + + and . + If unsure, say "n". + # # Should be selected if we can mmap non-coherent mappings to userspace. # The only thing that is really required is a way to set an uncached bit