From patchwork Fri Dec 29 08:18:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10136563 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 D143C60318 for ; Fri, 29 Dec 2017 08:27:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BE0172BFAA for ; Fri, 29 Dec 2017 08:27:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B25C82D91C; Fri, 29 Dec 2017 08:27:59 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 734F72BFAA for ; Fri, 29 Dec 2017 08:27:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=Q96r2AiLdBsAEFYppGaMGukEM9IL0GaYj8cIR8rhQaw=; b=EykqpsAIn0eouVIRyXcdF4y7a3 R4AJVfBOoKp6DaJlWJycEq3mChiUUOlH3B/pbJQSwPwPKYXD2hh8Q4PvZaHKFPwClPKe2YcQi5YpO 3SjtfLzRppDCi1Os08UrOEBEZT98GuglTkn9IQ9SbhnzsoT240EP9PptjKWkPuOwnn1ziNcavw7Qa 7UBXEMzXcQRBsYpE9leAPUarv1Hu688xNJT346kwZ/PQUjAacmiOx+ZxX6ngv9Nvj2hpkjmsK2K4M nyScbwLZjDF1E0c1knHaGN0gKk0DFHlLJTKM1R1VRKNt4Plwje3EW5dgegY2jZKnguwCtWCmOv627 9h7Cr1Rg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1eUq1E-0006xs-6D; Fri, 29 Dec 2017 08:27:56 +0000 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 1eUpur-0002CS-5W; Fri, 29 Dec 2017 08:21:21 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Subject: [PATCH 28/67] dma-direct: add support for CMA allocation Date: Fri, 29 Dec 2017 09:18:32 +0100 Message-Id: <20171229081911.2802-29-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-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Guan Xuetao , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, adi-buildroot-devel@lists.sourceforge.net, linux-m68k@lists.linux-m68k.org, patches@groups.riscv.org, linux-metag@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Michal Simek , linux-parisc@vger.kernel.org, linux-cris-kernel@axis.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Try the CMA allocator for coherent allocations if supported. Roughly modelled after the x86 code. Signed-off-by: Christoph Hellwig --- lib/dma-direct.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/lib/dma-direct.c b/lib/dma-direct.c index ddd9dcf4e663..d0266b39788b 100644 --- a/lib/dma-direct.c +++ b/lib/dma-direct.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #define DIRECT_MAPPING_ERROR 0 @@ -30,19 +31,30 @@ check_addr(struct device *dev, dma_addr_t dma_addr, size_t size, static void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) { - void *ret; + unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; + int page_order = get_order(size); + struct page *page = NULL; - ret = (void *)__get_free_pages(gfp, get_order(size)); - if (ret) - *dma_handle = phys_to_dma(dev, virt_to_phys(ret)); + /* 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); + if (!page) + page = alloc_pages(gfp, page_order); + if (!page) + return NULL; - return ret; + *dma_handle = phys_to_dma(dev, page_to_phys(page)); + memset(page_address(page), 0, size); + return page_address(page); } static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs) { - free_pages((unsigned long)cpu_addr, get_order(size)); + unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + if (!dma_release_from_contiguous(dev, virt_to_page(cpu_addr), count)) + free_pages((unsigned long)cpu_addr, get_order(size)); } static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,