From patchwork Fri Dec 29 08:18:36 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10136437 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 77D3860318 for ; Fri, 29 Dec 2017 08:22:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 66CF52D91C for ; Fri, 29 Dec 2017 08:22:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5B7C52DEEB; Fri, 29 Dec 2017 08:22:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 10C092D91C for ; Fri, 29 Dec 2017 08:22:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932617AbdL2IVz (ORCPT ); Fri, 29 Dec 2017 03:21:55 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:55506 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932547AbdL2IVv (ORCPT ); Fri, 29 Dec 2017 03:21:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=PueC7iQeB2bQtfDtw8oTIUmzv3wZ1dKWeI2kB84Y3Y0=; b=rSZN0AyCANhkknmx/Lxzky47O CULA8Z8ug64ZSEJnJ0n+Ge/zpYBZHGm8ydNTuzbxcDKkOaM/q1tIXNGiavrduBimi1It34c7tLlhg wpGjNOoHd0hnLeTgzxMzRgTUjMJi7R+p2QHVq4elrm7NUR8a2S7gT1SehHWf3Ra3sHCTQz/CAQUmx nMzTCMwPt0RS2IWGPjRmgmQu89KvgRihBRUIOyVwkbJWgZmUmRPrrSFSrJ0vN/H9GbqHx1Gi7/AHY y3Nlk4sTt4h/snqOj4eWet73uP3Sjle5tL8ezzKBh4fl24GbRhBqTY8T9cEjXdfY8i1X3ux2iClCt cE+qrQz3g==; Received: from 77.117.237.29.wireless.dyn.drei.com ([77.117.237.29] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eUpv7-0002NF-S0; Fri, 29 Dec 2017 08:21:38 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, adi-buildroot-devel@lists.sourceforge.net, linux-c6x-dev@linux-c6x.org, linux-cris-kernel@axis.com, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-metag@vger.kernel.org, Michal Simek , linux-mips@linux-mips.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, patches@groups.riscv.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Guan Xuetao , x86@kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 32/67] dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32 Date: Fri, 29 Dec 2017 09:18:36 +0100 Message-Id: <20171229081911.2802-33-hch@lst.de> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171229081911.2802-1-hch@lst.de> References: <20171229081911.2802-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Christoph Hellwig --- lib/dma-direct.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/lib/dma-direct.c b/lib/dma-direct.c index 7e913728e099..2e9b9494610c 100644 --- a/lib/dma-direct.c +++ b/lib/dma-direct.c @@ -12,6 +12,14 @@ #define DIRECT_MAPPING_ERROR 0 +/* + * Most architectures use ZONE_DMA for the first 16 Megabytes, but + * some use it for entirely different regions: + */ +#ifndef ARCH_ZONE_DMA_BITS +#define ARCH_ZONE_DMA_BITS 24 +#endif + static bool check_addr(struct device *dev, dma_addr_t dma_addr, size_t size, const char *caller) @@ -40,6 +48,12 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, int page_order = get_order(size); struct page *page = NULL; + /* GFP_DMA32 and GFP_DMA are no ops without the corresponding zones: */ + if (dev->coherent_dma_mask < DMA_BIT_MASK(32)) + gfp |= GFP_DMA32; + else if (dev->coherent_dma_mask < DMA_BIT_MASK(ARCH_ZONE_DMA_BITS)) + gfp |= GFP_DMA; + again: /* CMA can be used only in the context which permits sleeping */ if (gfpflags_allow_blocking(gfp)) {