From patchwork Fri Jan 12 08:42:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10159891 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 E12EF602A7 for ; Fri, 12 Jan 2018 08:46:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CBBAE286F2 for ; Fri, 12 Jan 2018 08:46:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BFA3C28931; Fri, 12 Jan 2018 08:46:25 +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 6C53C286F2 for ; Fri, 12 Jan 2018 08:46:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933788AbeALIqW (ORCPT ); Fri, 12 Jan 2018 03:46:22 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:47965 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933684AbeALIoN (ORCPT ); Fri, 12 Jan 2018 03:44:13 -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=KqTQ9gpRM5mdnZ4+PbKZZztFOTdS84gvO3UIDdU61M0=; b=C/rP/EPej76j2mvbcQC2JcaYP R/ae4h99gj4nbPHg7lH6fLCoDs+ALVgUkuwuDZKedNFD3yMSJmGb/Tyg3A8LCsF457XbYZxjVMnTX ejJDxVQRZdSHnAOr9I5H1NckA8L05trp47DMBk3CLSBlF/ZMZVaJkv2DfTk3rwVx5Q8Lfmif0kwI5 14s4DDKROGiU2eXvUDA9QV2UJWd+3nvsvJpq14e8+jTRfu7nBiNEhXGQCHvRN7HiwCZdWBgeqTh1p PLvnpp+tqVPEV62EHazJ+i9A8QzjqBRU2C3krbwCTk4fMCDGOrdDGv5Fke+3nC+VxSiOThSyuguuL HSM7SeKwQ==; Received: from [188.21.167.3] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eZuwY-0000D6-UB; Fri, 12 Jan 2018 08:44:07 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: Konrad Rzeszutek Wilk , linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, 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 29/34] dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32 Date: Fri, 12 Jan 2018 09:42:27 +0100 Message-Id: <20180112084232.2857-30-hch@lst.de> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20180112084232.2857-1-hch@lst.de> References: <20180112084232.2857-1-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 This allows to dip into zones for lower memory if they are available. If one of the zones is not available the corresponding GFP_* flag will evaluate to 0 so they won't change anything. We provide an arch tunable for those architectures that do not use GFP_DMA for the lowest 24-bits, given that there are a few. Roughly based on the x86 code. 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 f04a424f91fa..8f76032ebc3c 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) @@ -34,6 +42,12 @@ static void *dma_direct_alloc(struct device *dev, size_t size, 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(ARCH_ZONE_DMA_BITS)) + gfp |= GFP_DMA; + if (dev->coherent_dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) + gfp |= GFP_DMA32; + /* CMA can be used only in the context which permits sleeping */ if (gfpflags_allow_blocking(gfp)) page = dma_alloc_from_contiguous(dev, count, page_order, gfp);