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=-8.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 8C325C46477 for ; Fri, 14 Jun 2019 13:48:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 608332173C for ; Fri, 14 Jun 2019 13:48:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="oOXLpQSB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729083AbfFNNsm (ORCPT ); Fri, 14 Jun 2019 09:48:42 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:54198 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729065AbfFNNsk (ORCPT ); Fri, 14 Jun 2019 09:48:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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: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=ve9eOR0n9NYQG/06xL1T/7RN+D+EYosn1r01rGXCWe8=; b=oOXLpQSB9eTwi5cRnaIs3K9jSP U3nYifQRasO4H8c9LydLZ7aFiLS8AmMO8L7HX1fSqc06MgW+WgkhhHaoKo2MKfTDNYkKunWyK4auH sDEmoQgB8oqOU4hpKwhX2F52HvfX8JBk7RhqZQB3ZfChLLyBOjp1aO1CsWRbTm+0Fj1lVP/P78vhq Q/tTXEXgky31g4PmH9ZYyI2SmqKT0gbaGOa4wj3ZMyfwF3m6qpJz2Hgvhxr+PiNdqUsIFqqBd/Bdq t5+5nb9o2JxesKPlAa9uOOJPL3zGPLmnTYV+Z+YPjVKvRBW0T/H3FZDUMD4bcdC4PQzCFzjLGL6V3 kn/hUemg==; Received: from 213-225-9-13.nat.highway.a1.net ([213.225.9.13] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hbmZB-0005nI-Ab; Fri, 14 Jun 2019 13:48:30 +0000 From: Christoph Hellwig To: Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Daniel Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Ian Abbott , H Hartley Sweeten Cc: Intel Linux Wireless , linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-s390@vger.kernel.org, devel@driverdev.osuosl.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH 16/16] dma-mapping: use exact allocation in dma_alloc_contiguous Date: Fri, 14 Jun 2019 15:47:26 +0200 Message-Id: <20190614134726.3827-17-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190614134726.3827-1-hch@lst.de> References: <20190614134726.3827-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Many architectures (e.g. arm, m68 and sh) have always used exact allocation in their dma coherent allocator, which avoids a lot of memory waste especially for larger allocations. Lift this behavior into the generic allocator so that dma-direct and the generic IOMMU code benefit from this behavior as well. Signed-off-by: Christoph Hellwig --- include/linux/dma-contiguous.h | 8 +++++--- kernel/dma/contiguous.c | 17 +++++++++++------ 2 files changed, 16 insertions(+), 9 deletions(-) diff --git a/include/linux/dma-contiguous.h b/include/linux/dma-contiguous.h index c05d4e661489..2e542e314acf 100644 --- a/include/linux/dma-contiguous.h +++ b/include/linux/dma-contiguous.h @@ -161,15 +161,17 @@ static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) { int node = dev ? dev_to_node(dev) : NUMA_NO_NODE; - size_t align = get_order(PAGE_ALIGN(size)); + void *cpu_addr = alloc_pages_exact_node(node, size, gfp); - return alloc_pages_node(node, gfp, align); + if (!cpu_addr) + return NULL; + return virt_to_page(p); } static inline void dma_free_contiguous(struct device *dev, struct page *page, size_t size) { - __free_pages(page, get_order(size)); + free_pages_exact(page_address(page), get_order(size)); } #endif diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index bfc0c17f2a3d..84f41eea2741 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -232,9 +232,8 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) { int node = dev ? dev_to_node(dev) : NUMA_NO_NODE; size_t count = PAGE_ALIGN(size) >> PAGE_SHIFT; - size_t align = get_order(PAGE_ALIGN(size)); - struct page *page = NULL; struct cma *cma = NULL; + void *cpu_addr; if (dev && dev->cma_area) cma = dev->cma_area; @@ -243,14 +242,20 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) /* CMA can be used only in the context which permits sleeping */ if (cma && gfpflags_allow_blocking(gfp)) { + size_t align = get_order(PAGE_ALIGN(size)); + struct page *page; + align = min_t(size_t, align, CONFIG_CMA_ALIGNMENT); page = cma_alloc(cma, count, align, gfp & __GFP_NOWARN); + if (page) + return page; } /* Fallback allocation of normal pages */ - if (!page) - page = alloc_pages_node(node, gfp, align); - return page; + cpu_addr = alloc_pages_exact_node(node, size, gfp); + if (!cpu_addr) + return NULL; + return virt_to_page(cpu_addr); } /** @@ -267,7 +272,7 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) void dma_free_contiguous(struct device *dev, struct page *page, size_t size) { if (!cma_release(dev_get_cma_area(dev), page, size >> PAGE_SHIFT)) - __free_pages(page, get_order(size)); + free_pages_exact(page_address(page), get_order(size)); } /* -- 2.20.1