From patchwork Fri Jun 14 14:44:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10995719 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8AD7514BB for ; Fri, 14 Jun 2019 14:45:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B15F28517 for ; Fri, 14 Jun 2019 14:45:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6EAFC286AE; Fri, 14 Jun 2019 14:45:11 +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=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 0E35F283CA for ; Fri, 14 Jun 2019 14:45:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728711AbfFNOpG (ORCPT ); Fri, 14 Jun 2019 10:45:06 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:38918 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728392AbfFNOpF (ORCPT ); Fri, 14 Jun 2019 10:45:05 -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=FVUCgCFoYGXgRdotxfVuIpfdudDn7941OPaQ1qXavC8=; b=sl95Anw/1yGtNJg+5X/ycUvw5B R+FPClXInpjM0I2EDyP21g2dvHAlOqQgF3zhZCLbTiK7YVrhM+htr4NidyrleEyfZlLoMqq0hcaVd EM6nsp1ssY0bK4+tSMjmeERHUyeGLxS0NIriyrA9ESrJBYQMGrY3UpNsRPd7ReQ99FnoaVuhg63H5 4hZcpogxT5coYCeqkv1L+oc/QJslp8fLPfdVPLriqmGmdT+jLtU5jbKz5eeIesW2IdB0Ug1GfeDFG v/qpUmhAHdnFnAMTRtcnAb2KLfaZr6mO0UO/zoZ1fEOcNNbRDDEJo5eZrR4VoPS4XqfwjfHYnlCYF eRHc24VA==; 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 1hbnRi-0005yA-Mt; Fri, 14 Jun 2019 14:44:51 +0000 From: Christoph Hellwig To: Vineet Gupta Cc: Jonas Bonn , Stefan Kristiansson , Stafford Horne , Helge Deller , Vladimir Murzin , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linux-xtensa@linux-xtensa.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/7] dma-mapping: add a dma_alloc_need_uncached helper Date: Fri, 14 Jun 2019 16:44:28 +0200 Message-Id: <20190614144431.21760-5-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190614144431.21760-1-hch@lst.de> References: <20190614144431.21760-1-hch@lst.de> MIME-Version: 1.0 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 Check if we need to allocate uncached memory for a device given the allocation flags. Switch over the uncached segment check to this helper to deal with architectures that do not support the dma_cache_sync operation and thus should not returned cacheable memory for DMA_ATTR_NON_CONSISTENT allocations. Signed-off-by: Christoph Hellwig --- include/linux/dma-noncoherent.h | 14 ++++++++++++++ kernel/dma/direct.c | 4 ++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h index 7e0126a04e02..732919ac5c11 100644 --- a/include/linux/dma-noncoherent.h +++ b/include/linux/dma-noncoherent.h @@ -20,6 +20,20 @@ static inline bool dev_is_dma_coherent(struct device *dev) } #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */ +/* + * Check if an allocation needs to be marked uncached to be coherent. + */ +static inline bool dma_alloc_need_uncached(struct device *dev, + unsigned long attrs) +{ + if (dev_is_dma_coherent(dev)) + return false; + if (IS_ENABLED(CONFIG_DMA_NONCOHERENT_CACHE_SYNC) && + (attrs & DMA_ATTR_NON_CONSISTENT)) + return false; + return true; +} + void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index b67f0aa08aa3..c2893713bf80 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -160,7 +160,7 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size, memset(ret, 0, size); if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) && - !dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) { + dma_alloc_need_uncached(dev, attrs)) { arch_dma_prep_coherent(page, size); ret = uncached_kernel_address(ret); } @@ -182,7 +182,7 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr, set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order); if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) && - !dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) + dma_alloc_need_uncached(dev, attrs)) cpu_addr = cached_kernel_address(cpu_addr); __dma_direct_free_pages(dev, size, virt_to_page(cpu_addr)); }