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=-19.1 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 EDACEC43460 for ; Tue, 18 May 2021 06:42:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D2B88611BD for ; Tue, 18 May 2021 06:42:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346671AbhERGoP (ORCPT ); Tue, 18 May 2021 02:44:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32870 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346663AbhERGoO (ORCPT ); Tue, 18 May 2021 02:44:14 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 296F2C061756 for ; Mon, 17 May 2021 23:42:57 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id a11so4534379plh.3 for ; Mon, 17 May 2021 23:42:57 -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=dhey+gEpzKL8h8pP3jKcbtrIWfO9mRaRLZrTGjSACw0=; b=OzRbULE97gDu+nJm+2W1/NzhhkCj0QCTZrsqxU76qn+vtZGLqcb+w1igoYylLgqZMK FNrnT45xuk38fTuKCy3r98pZ9JUuUor+pLXJzBOrMy0zAumHGMSv3m5XekoY/RuTIkUO rl+4b1wiByTGqcgiDzKrnenCWuMAxjCqA3MzM= 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=dhey+gEpzKL8h8pP3jKcbtrIWfO9mRaRLZrTGjSACw0=; b=rKDZVIeNbJno8QSyo7uDF6PshQ2gtfU8HJRV86tOgWkSXgH3TQ7RTGeydmmoSTm/XM CSMgMcOj6//cvlCdXm53Cmud2havsrlyEHrAQMjljMv+GymcrYjPjvNB9Wfnap/U0PJl oM4VgJL5urRFT2h7N7Sd4pHIIYMaspSMSSsac7UgSLL6GBJdNQFO4ZW0Da2H9jsHhr2C Z2/kzWBt5L+j2HhmHKgUD4cnBw5JI7gVV4l18RYaU3ScxWcWWmZKM+wOc9E8SQ61jfqa H4oiwdNL7KzMLESeZYqrQxRxMbID6PBSkg/QGQVLWWaYVBtyX/NwEKbqtiQ5RNk6iZRS YPIg== X-Gm-Message-State: AOAM533WFBBgVcbAHoIEbKL5Qf3km6oCM1o8mHeWsU9rqiUuC7ZxbswF PGQ7xUWZqxAnZQIXqM8ACLxU2Q== X-Google-Smtp-Source: ABdhPJzAlI3Jj1VfPflg9N5+BlUFXyQH4Z87PXO5YBjAsPmi6ozdOqhZFzyDTIlkjmaywaEzQdXtCA== X-Received: by 2002:a17:90b:1d8f:: with SMTP id pf15mr3521801pjb.164.1621320176785; Mon, 17 May 2021 23:42:56 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:f284:b819:54ca:c198]) by smtp.gmail.com with UTF8SMTPSA id o7sm7726182pgs.45.2021.05.17.23.42.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 May 2021 23:42:56 -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, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v7 03/15] swiotlb: Add DMA_RESTRICTED_POOL Date: Tue, 18 May 2021 14:42:03 +0800 Message-Id: <20210518064215.2856977-4-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.751.gd2f1c929bd-goog In-Reply-To: <20210518064215.2856977-1-tientzu@chromium.org> References: <20210518064215.2856977-1-tientzu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@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 -- 2.31.1.751.gd2f1c929bd-goog