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=-13.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 82414C4741F for ; Wed, 30 Sep 2020 16:10:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 297082085B for ; Wed, 30 Sep 2020 16:10:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="K7EO9cRv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731035AbgI3QJe (ORCPT ); Wed, 30 Sep 2020 12:09:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730980AbgI3QJc (ORCPT ); Wed, 30 Sep 2020 12:09:32 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 36BC2C061755; Wed, 30 Sep 2020 09:09:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=fcJxwoQ+kZKNx/nryCD7ZbkgjtXm1YK3I5cf/tzI15g=; b=K7EO9cRvqiyOHHAuOj+yInRw9e aJTZbNY6h8qg6La0bk5dj+xM/PU5+VeOuJ9YhhDCqKy1IV6JfVpsa3QNZRUxOxNDVyZubSBafYpw/ 8B9KbiiBu8HF6qFaWoZ9Nc1tvZfosiixYgC0KZ5+3cBXrJfVVvacmmaHlgPaa24vT44E19Bi/Pw5F rLE3znMdkvvyCdJJAy8KkMJaJNP4aoskq1wfuDz0gHU+pCLAIPQTTeEJowpQDT53HF24P5Rhuj3xs +qv4bBP1a4NuwrtJnJLhYVWbWli41HX7YLlCWv7SmF4pi/giKNBMZ768eYdOWjDVKv0Iy3bedlGyc l+0H6jqQ==; Received: from [2001:4bb8:180:7b62:c70:4a89:bc61:4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kNefU-0003D8-Uo; Wed, 30 Sep 2020 16:09:25 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 3/8] dma-direct check for highmem pages in dma_direct_alloc_pages Date: Wed, 30 Sep 2020 18:09:12 +0200 Message-Id: <20200930160917.1234225-4-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200930160917.1234225-1-hch@lst.de> References: <20200930160917.1234225-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Check for highmem pages from CMA, just like in the dma_direct_alloc path. Signed-off-by: Christoph Hellwig --- kernel/dma/direct.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 121a9c1969dd3a..b5f20781d3a96f 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -309,6 +309,17 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size, page = __dma_direct_alloc_pages(dev, size, gfp); if (!page) return NULL; + if (PageHighMem(page)) { + /* + * Depending on the cma= arguments and per-arch setup + * dma_alloc_contiguous could return highmem pages. + * Without remapping there is no way to return them here, + * so log an error and fail. + */ + dev_info(dev, "Rejecting highmem page from CMA.\n"); + goto out_free_pages; + } + ret = page_address(page); if (force_dma_unencrypted(dev)) { if (set_memory_decrypted((unsigned long)ret, -- 2.28.0