From patchwork Mon May 10 09:50:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12247373 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=-19.4 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 B66CEC43462 for ; Mon, 10 May 2021 09:51:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9514E61466 for ; Mon, 10 May 2021 09:51:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231134AbhEJJwR (ORCPT ); Mon, 10 May 2021 05:52:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57972 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230479AbhEJJwP (ORCPT ); Mon, 10 May 2021 05:52:15 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC1F8C061761 for ; Mon, 10 May 2021 02:51:05 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id j6-20020a17090adc86b02900cbfe6f2c96so9984689pjv.1 for ; Mon, 10 May 2021 02:51:05 -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=UxwjATyfUtX3knbkz7Ng4a91AyuLGtHH/dkvosOSCGg=; b=KOr6914IYxgjLwHfgEdtt7yY0GH36g2NGsJo3fGwbbJaZNcrllky3/6cWFIPbrcxnF J6WIRuHd84U2i5BBiDKA/bsQe9y2Z9UkJ/RbWHnAxAdDWQ5FGpvFFVOBGDi0XQRFybWw dDc+W6hlTJe2OtGlIaJLuh2fe89FW6RCivPnU= 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=UxwjATyfUtX3knbkz7Ng4a91AyuLGtHH/dkvosOSCGg=; b=fYHBAP3T3n/XFr5FOqmDbMwyK2pXcw4P1OvW6ZXk0DQl5fX32BNOFTKDQLK9pUskSB ziHkLKUgRVdNi8LcO101guFoCyg5UGednrZ9fld4KTijGwAO6CuQMSm7KL7ZvFxNELBs ggw4AeQWnV8gV0Lgypl8ksb8FTsMWGELeAfTWasAc0FHLOw4e3iQ3Wvzl3jiio/Y0JUm wv3KGwWB0m/k17oSc1hlzaNtgRCbzcpACDObh9if5RtCyg71rc7sSU75aEZcZok1rF6+ Cdt7xctA9HzM7GsJ+Druw7bB1upPBZDaZfJbS3n9UNKNBsTPsbw8SN1VgytlSHJFtGDY fHMg== X-Gm-Message-State: AOAM532P8tm/f+fqVtLapY8cVT0V89rhYtBIqh0WaHeLlf0ZSaE0B5Gs gB3KM1kMoIfhGMVFWn8Tl/ZhNw== X-Google-Smtp-Source: ABdhPJxTaq6vhy1R6G0CsSRkldwCBABZULYIDbfdaYlGZp1FgQhncVgdgDLR34kcwkcv6yJulF+tnA== X-Received: by 2002:a17:90a:cf10:: with SMTP id h16mr26442566pju.49.1620640265461; Mon, 10 May 2021 02:51:05 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:a524:abe8:94e3:5601]) by smtp.gmail.com with UTF8SMTPSA id ga1sm11342699pjb.5.2021.05.10.02.50.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 May 2021 02:51:05 -0700 (PDT) From: Claire Chang To: Rob Herring , mpe@ellerman.id.au, 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 v6 03/15] swiotlb: Add DMA_RESTRICTED_POOL Date: Mon, 10 May 2021 17:50:14 +0800 Message-Id: <20210510095026.3477496-4-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.607.g51e8a6a459-goog In-Reply-To: <20210510095026.3477496-1-tientzu@chromium.org> References: <20210510095026.3477496-1-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