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=-12.6 required=3.0 tests=BAYES_00,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=ham 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 280BBC433FE for ; Wed, 19 Aug 2020 06:57:31 +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 DF98C20825 for ; Wed, 19 Aug 2020 06:57:30 +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="YVejIXY4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DF98C20825 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 B9D7D2094B; Wed, 19 Aug 2020 06:57:30 +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 Ulh-pGzjickG; Wed, 19 Aug 2020 06:57:25 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id 2FEAB2094C; Wed, 19 Aug 2020 06:57:23 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 29354C07FF; Wed, 19 Aug 2020 06:57:23 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 9DCD2C0051 for ; Wed, 19 Aug 2020 06:57:22 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 8C83786C46 for ; Wed, 19 Aug 2020 06:57:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mqcQgy1y9ibW for ; Wed, 19 Aug 2020 06:57:22 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by whitealder.osuosl.org (Postfix) with ESMTPS id 9C04386AA1 for ; Wed, 19 Aug 2020 06:57:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=rHSBc/M4bEuOb9Ey0sWSjsN3haNI1yyBuzSqz9ajJzQ=; b=YVejIXY46cjbXnB7HRS7QdyGN0 rzYUMX3LQCwvbmHC6T4MNtkWhsUIW62+JBnb7nbIi53asopN5O5j8LI/TbrhrTaXhtiNUiNct2i3P uk78NGgvVuH/tDXGWfzr1c9ZKALeWVaYgQZxSkrFbZjeARGsdjhRaPBOVTI+9S7YkW4DyKTwu4Eqe ZdL5pVD9fQZA45Mvfyz4KprhJJxEFgphsAyBLur+DYrJO9et6FfP1sA4FfkqSOmHH6fYKJ008ANQP L//Kb+0DzBCMDP/39KncfO9EvWWgJ3EUkh1q6MV+AfG2SnJA6QEX6d4EDY7nkSU2dHdJADBMSZjm1 dYYyAX3Q==; Received: from [2001:4bb8:198:f3b2:86b6:2277:f429:37a1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1k8I1U-0008Ra-0J; Wed, 19 Aug 2020 06:56:36 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Thomas Bogendoerfer , "James E.J. Bottomley" , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Ben Skeggs , Pawel Osciak , Marek Szyprowski , Matt Porter , iommu@lists.linux-foundation.org Subject: [PATCH 18/28] dma-mapping: move the dma_declare_coherent_memory documentation Date: Wed, 19 Aug 2020 08:55:45 +0200 Message-Id: <20200819065555.1802761-19-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200819065555.1802761-1-hch@lst.de> References: <20200819065555.1802761-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Cc: Tom Lendacky , alsa-devel@alsa-project.org, linux-samsung-soc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-scsi@vger.kernel.org, linux-parisc@vger.kernel.org, linux-doc@vger.kernel.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.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" dma_declare_coherent_memory should not be in a DMA API guide aimed at driver writers (that is consumers of the API). Move it to a comment near the function instead. Signed-off-by: Christoph Hellwig --- Documentation/core-api/dma-api.rst | 24 ------------------------ kernel/dma/coherent.c | 17 +++++++++++++++++ 2 files changed, 17 insertions(+), 24 deletions(-) diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index 3b3abbbb4b9a6f..90239348b30f6f 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -586,30 +586,6 @@ the DMA_ATTR_NON_CONSISTENT flag starting at virtual address vaddr and continuing on for size. Again, you *must* observe the cache line boundaries when doing this. -:: - - int - dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, - dma_addr_t device_addr, size_t size); - -Declare region of memory to be handed out by dma_alloc_coherent() when -it's asked for coherent memory for this device. - -phys_addr is the CPU physical address to which the memory is currently -assigned (this will be ioremapped so the CPU can access the region). - -device_addr is the DMA address the device needs to be programmed -with to actually address this memory (this will be handed out as the -dma_addr_t in dma_alloc_coherent()). - -size is the size of the area (must be multiples of PAGE_SIZE). - -As a simplification for the platforms, only *one* such region of -memory may be declared per device. - -For reasons of efficiency, most platforms choose to track the declared -region only at the granularity of a page. For smaller allocations, -you should use the dma_pool() API. Part III - Debug drivers use of the DMA-API ------------------------------------------- diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 2a0c4985f38e41..f85d14bbfcbe03 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -107,6 +107,23 @@ static int dma_assign_coherent_memory(struct device *dev, return 0; } +/* + * Declare a region of memory to be handed out by dma_alloc_coherent() when it + * is asked for coherent memory for this device. This shall only be used + * from platform code, usually based on the device tree description. + * + * phys_addr is the CPU physical address to which the memory is currently + * assigned (this will be ioremapped so the CPU can access the region). + * + * device_addr is the DMA address the device needs to be programmed with to + * actually address this memory (this will be handed out as the dma_addr_t in + * dma_alloc_coherent()). + * + * size is the size of the area (must be a multiple of PAGE_SIZE). + * + * As a simplification for the platforms, only *one* such region of memory may + * be declared per device. + */ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size) { -- 2.28.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu