Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756982AbYHDQFU (ORCPT ); Mon, 4 Aug 2008 12:05:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753864AbYHDQFD (ORCPT ); Mon, 4 Aug 2008 12:05:03 -0400 Received: from outbound-wa4.frontbridge.com ([216.32.181.16]:50348 "EHLO WA4EHSOBE006.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751920AbYHDQFC (ORCPT ); Mon, 4 Aug 2008 12:05:02 -0400 X-BigFish: VPS11(z1039ozzz10d3izzz32i43j66h) X-Spam-TCS-SCL: 5:0 X-WSS-ID: 0K533C0-04-0U9-01 From: Joerg Roedel To: Andrew Morton CC: mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com, rth@twiddle.net, paulus@samba.org, benh@kernel.crashing.org, davem@davemloft.net, FUJITA Tomonori , Muli Ben-Yehuda , linux-kernel@vger.kernel.org, Joerg Roedel Subject: [PATCH 04/10] introduce generic iommu_num_pages function Date: Mon, 4 Aug 2008 18:04:44 +0200 Message-ID: <1217865890-3593-5-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1217865890-3593-1-git-send-email-joerg.roedel@amd.com> References: <1217865890-3593-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 04 Aug 2008 16:04:51.0589 (UTC) FILETIME=[D3C43350:01C8F64B] MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1672 Lines: 46 This patch introduces the generic iommu_num_pages function. It can be used by different architectures to calculate the number of IOMMU pages required to map a given memory area. Signed-off-by: Joerg Roedel --- include/linux/iommu-helper.h | 2 ++ lib/iommu-helper.c | 9 +++++++++ 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h index c975caf..cb659aa 100644 --- a/include/linux/iommu-helper.h +++ b/include/linux/iommu-helper.h @@ -8,3 +8,5 @@ extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, unsigned long align_mask); extern void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr); +extern unsigned long iommu_num_pages(unsigned long addr, unsigned long len, + unsigned long io_page_size); diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c index a3b8d4c..ca4a963 100644 --- a/lib/iommu-helper.c +++ b/lib/iommu-helper.c @@ -80,3 +80,12 @@ void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr) } } EXPORT_SYMBOL(iommu_area_free); + +unsigned long iommu_num_pages(unsigned long addr, unsigned long len, + unsigned long io_page_size) +{ + unsigned long size = (addr & (io_page_size - 1)) + len; + + return DIV_ROUND_UP(size, io_page_size); +} +EXPORT_SYMBOL(iommu_num_pages); -- 1.5.3.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/