From patchwork Thu Aug 15 11:10:47 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 2845122 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id EF33D9F2F4 for ; Thu, 15 Aug 2013 11:44:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1093420322 for ; Thu, 15 Aug 2013 11:44:23 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3741D201C7 for ; Thu, 15 Aug 2013 11:44:18 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V9vV3-00033D-3N; Thu, 15 Aug 2013 11:13:54 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V9vUD-0005LA-RJ; Thu, 15 Aug 2013 11:13:01 +0000 Received: from smtp02.citrix.com ([66.165.176.63]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V9vT3-0005CL-2B for linux-arm-kernel@lists.infradead.org; Thu, 15 Aug 2013 11:11:51 +0000 X-IronPort-AV: E=Sophos;i="4.89,885,1367971200"; d="scan'208";a="42396944" Received: from accessns.citrite.net (HELO FTLPEX01CL01.citrite.net) ([10.9.154.239]) by FTLPIPO02.CITRIX.COM with ESMTP/TLS/AES128-SHA; 15 Aug 2013 11:11:02 +0000 Received: from ukmail1.uk.xensource.com (10.80.16.128) by smtprelay.citrix.com (10.13.107.78) with Microsoft SMTP Server id 14.2.342.4; Thu, 15 Aug 2013 07:11:02 -0400 Received: from kaball.uk.xensource.com ([10.80.2.59]) by ukmail1.uk.xensource.com with esmtp (Exim 4.69) (envelope-from ) id 1V9vSC-0006oC-Nw; Thu, 15 Aug 2013 12:10:56 +0100 From: Stefano Stabellini To: Subject: [PATCH v4 03/10] arm: make SWIOTLB available Date: Thu, 15 Aug 2013 12:10:47 +0100 Message-ID: <1376565054-24153-3-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130815_071149_485960_E4BD779D X-CRM114-Status: GOOD ( 12.64 ) X-Spam-Score: -5.4 (-----) Cc: linux@arm.linux.org.uk, Ian.Campbell@citrix.com, Stefano Stabellini , konrad.wilk@oracle.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP IOMMU_HELPER is needed because SWIOTLB calls iommu_is_span_boundary, provided by lib/iommu_helper.c. Signed-off-by: Stefano Stabellini Reviewed-by: Konrad Rzeszutek Wilk CC: will.deacon@arm.com CC: linux@arm.linux.org.uk Changes in v3: - dma_capable: do not treat dma_mask as a limit; - remove SWIOTLB dependency on NEED_SG_DMA_LENGTH. --- arch/arm/Kconfig | 6 ++++++ arch/arm/include/asm/dma-mapping.h | 30 ++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ba412e0..c0bfb33 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1832,6 +1832,12 @@ config CC_STACKPROTECTOR neutralized via a kernel panic. This feature requires gcc version 4.2 or above. +config SWIOTLB + def_bool y + +config IOMMU_HELPER + def_bool SWIOTLB + config XEN_DOM0 def_bool y depends on XEN diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 5b579b9..5b8eef9 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -86,6 +86,36 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) } #endif +static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + unsigned int offset = paddr & ~PAGE_MASK; + return pfn_to_dma(dev, paddr >> PAGE_SHIFT) + offset; +} + +static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) +{ + unsigned int offset = dev_addr & ~PAGE_MASK; + return (dma_to_pfn(dev, dev_addr) << PAGE_SHIFT) + offset; +} + +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) +{ + u64 limit, mask = *dev->dma_mask; + + limit = (mask + 1) & ~mask; + if (limit && size > limit) + return 0; + + if ((addr | (addr + size - 1)) & ~mask) + return 0; + + return 1; +} + +static inline void dma_mark_clean(void *addr, size_t size) +{ +} + /* * DMA errors are defined by all-bits-set in the DMA address. */