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=-9.6 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,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 44463C11D12 for ; Thu, 20 Feb 2020 17:02:01 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1394020722 for ; Thu, 20 Feb 2020 17:02:01 +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="T5FBHWOl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1394020722 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id E27A721537; Thu, 20 Feb 2020 17:02:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Bw0oX+RsuqcL; Thu, 20 Feb 2020 17:01:59 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id 83B112010F; Thu, 20 Feb 2020 17:01:59 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7A63BC1D81; Thu, 20 Feb 2020 17:01:59 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 3B551C013E for ; Thu, 20 Feb 2020 17:01:57 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 298D62151F for ; Thu, 20 Feb 2020 17:01:57 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tAFhl07bJgOQ for ; Thu, 20 Feb 2020 17:01:55 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by silver.osuosl.org (Postfix) with ESMTPS id 6048C2010F for ; Thu, 20 Feb 2020 17:01:55 +0000 (UTC) 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; bh=HtENtGXMu5lv8v2BETZ/HEIobwIkiHxnVtk2a6XxHoE=; b=T5FBHWOl/1ly9t3RQlAFneq+LH znE7SnHgY6zEKFQuQFZUtOazi674gzMFHGtiQRguRPHKUpUbCoRszbOyCSWhkt5V4wSetu00nWMIj SDgv5AxVFpQcpDs+txdludIlKBFYOQM5UH4DDKtuJx3uUFq3HQs9y6EFsF2ibt/ltHLfYK5TuFuGb RlMbOcbURkAR2slWv5WKCiEA3XimfqMSpfvhYQoM2LMwGno23dRlU80vcUm8bl1QsE3T7jCGJVyHF 7Xk61JwG6k321wmvBIC0Nvxxm0md3oLioj7VFTWt/fxqpt0GInQM4j4s/G4tm7ygXDCIQP8LoIgV9 ib0EF5Dg==; Received: from [38.126.112.138] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j4pCl-0000Dq-Og; Thu, 20 Feb 2020 17:01:39 +0000 From: Christoph Hellwig To: Jonas Bonn , Stefan Kristiansson , Stafford Horne Subject: [PATCH 2/2] openrisc: use the generic in-place uncached DMA allocator Date: Thu, 20 Feb 2020 09:01:39 -0800 Message-Id: <20200220170139.387354-3-hch@lst.de> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200220170139.387354-1-hch@lst.de> References: <20200220170139.387354-1-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 Cc: Mark Rutland , linux-arch@vger.kernel.org, Robin Murphy , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, openrisc@lists.librecores.org, Will Deacon , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Switch openrisc to use the dma-direct allocator and just provide the hooks for setting memory uncached or cached. Signed-off-by: Christoph Hellwig --- arch/openrisc/Kconfig | 1 + arch/openrisc/kernel/dma.c | 51 +++++--------------------------------- 2 files changed, 7 insertions(+), 45 deletions(-) diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index 1928e061ff96..041fff4326dc 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -7,6 +7,7 @@ config OPENRISC def_bool y select ARCH_32BIT_OFF_T + select ARCH_HAS_DMA_SET_UNCACHED select ARCH_HAS_SYNC_DMA_FOR_DEVICE select OF select OF_EARLY_FLATTREE diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c index adec711ad39d..c73d2b3ae267 100644 --- a/arch/openrisc/kernel/dma.c +++ b/arch/openrisc/kernel/dma.c @@ -11,8 +11,6 @@ * Copyright (C) 2010-2011 Jonas Bonn * * DMA mapping callbacks... - * As alloc_coherent is the only DMA callback being used currently, that's - * the only thing implemented properly. The rest need looking into... */ #include @@ -67,62 +65,25 @@ static const struct mm_walk_ops clear_nocache_walk_ops = { .pte_entry = page_clear_nocache, }; -/* - * Alloc "coherent" memory, which for OpenRISC means simply uncached. - * - * This function effectively just calls __get_free_pages, sets the - * cache-inhibit bit on those pages, and makes sure that the pages are - * flushed out of the cache before they are used. - * - * If the NON_CONSISTENT attribute is set, then this function just - * returns "normal", cachable memory. - * - * There are additional flags WEAK_ORDERING and WRITE_COMBINE to take - * into consideration here, too. All current known implementations of - * the OR1K support only strongly ordered memory accesses, so that flag - * is being ignored for now; uncached but write-combined memory is a - * missing feature of the OR1K. - */ -void * -arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, - gfp_t gfp, unsigned long attrs) +int arch_dma_set_uncached(void *cpu_addr, size_t size) { - unsigned long va; - void *page; - - page = alloc_pages_exact(size, gfp | __GFP_ZERO); - if (!page) - return NULL; - - /* This gives us the real physical address of the first page. */ - *dma_handle = __pa(page); - - va = (unsigned long)page; + unsigned long va = (unsigned long)cpu_addr; /* * We need to iterate through the pages, clearing the dcache for * them and setting the cache-inhibit bit. */ - if (walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops, - NULL)) { - free_pages_exact(page, size); - return NULL; - } - - return (void *)va; + return walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops, + NULL); } -void -arch_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) +void arch_dma_clear_uncached(void *cpu_addr, size_t size) { - unsigned long va = (unsigned long)vaddr; + unsigned long va = (unsigned long)cpu_addr; /* walk_page_range shouldn't be able to fail here */ WARN_ON(walk_page_range(&init_mm, va, va + size, &clear_nocache_walk_ops, NULL)); - - free_pages_exact(vaddr, size); } void arch_sync_dma_for_device(phys_addr_t addr, size_t size, -- 2.24.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu