From patchwork Thu May 26 06:31:31 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 819642 Received: from canuck.infradead.org (canuck.infradead.org [134.117.69.58]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p4Q6VjKD030653 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 26 May 2011 06:32:07 GMT Received: from localhost ([127.0.0.1] helo=canuck.infradead.org) by canuck.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1QPU2C-0007Og-B8; Thu, 26 May 2011 06:27:04 +0000 Received: from db3ehsobe006.messaging.microsoft.com ([213.199.154.144] helo=DB3EHSOBE006.bigfish.com) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QPU28-0007O2-2v for linux-arm-kernel@lists.infradead.org; Thu, 26 May 2011 06:27:01 +0000 Received: from mail60-db3-R.bigfish.com (10.3.81.249) by DB3EHSOBE006.bigfish.com (10.3.84.26) with Microsoft SMTP Server id 14.1.225.22; Thu, 26 May 2011 06:26:56 +0000 Received: from mail60-db3 (localhost.localdomain [127.0.0.1]) by mail60-db3-R.bigfish.com (Postfix) with ESMTP id 18AEA181082D; Thu, 26 May 2011 06:26:56 +0000 (UTC) X-SpamScore: 0 X-BigFish: VS0(zzzz1202hzz8275dhz2dh87h2a8h668h839h61h) X-Spam-TCS-SCL: 0:0 X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPVD:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-FB-DOMAIN-IP-MATCH: fail Received: from mail60-db3 (localhost.localdomain [127.0.0.1]) by mail60-db3 (MessageSwitch) id 1306391215910015_19651; Thu, 26 May 2011 06:26:55 +0000 (UTC) Received: from DB3EHSMHS003.bigfish.com (unknown [10.3.81.248]) by mail60-db3.bigfish.com (Postfix) with ESMTP id DA68A107804B; Thu, 26 May 2011 06:26:55 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by DB3EHSMHS003.bigfish.com (10.3.87.103) with Microsoft SMTP Server (TLS) id 14.1.225.22; Thu, 26 May 2011 06:26:55 +0000 Received: from az33smr02.freescale.net (10.64.34.200) by 039-SN1MMR1-001.039d.mgd.msft.net (10.84.1.13) with Microsoft SMTP Server id 14.1.270.2; Thu, 26 May 2011 01:26:53 -0500 Received: from S2100-06.ap.freescale.net (S2100-06.ap.freescale.net [10.192.242.125]) by az33smr02.freescale.net (8.13.1/8.13.0) with ESMTP id p4Q6QpUO026468; Thu, 26 May 2011 01:26:52 -0500 (CDT) From: Shawn Guo To: Subject: [PATCH 1/3] dmaengine: add new dma API for max_segment_number Date: Thu, 26 May 2011 14:31:31 +0800 Message-ID: <1306391493-29425-1-git-send-email-shawn.guo@linaro.org> X-Mailer: git-send-email 1.7.4.1 MIME-Version: 1.0 X-OriginatorOrg: sigmatel.com X-CRM114-Version: 20090807-BlameThorstenAndJenny ( TRE 0.7.6 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20110526_022700_404378_F5445D87 X-CRM114-Status: GOOD ( 14.91 ) X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.3.1 on canuck.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [213.199.154.144 listed in list.dnswl.org] Cc: vinod.koul@intel.com, dan.j.williams@intel.com, Shawn Guo , linux-arm-kernel@lists.infradead.org, patches@linaro.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Thu, 26 May 2011 06:32:07 +0000 (UTC) Like dma_set(get)_max_seg_size for max_segment_size, the patch adds max_segment_number into device_dma_parameters and creates the corresponding dmaengine API dma_set(get)_max_seg_number for it. Signed-off-by: Shawn Guo --- include/linux/device.h | 1 + include/linux/dma-mapping.h | 15 +++++++++++++++ 2 files changed, 16 insertions(+), 0 deletions(-) diff --git a/include/linux/device.h b/include/linux/device.h index c66111a..44cb2528 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -487,6 +487,7 @@ struct device_dma_parameters { * sg limitations. */ unsigned int max_segment_size; + unsigned int max_segment_number; unsigned long segment_boundary_mask; }; diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index ba8319a..fd314f4 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -131,6 +131,21 @@ static inline unsigned int dma_set_max_seg_size(struct device *dev, return -EIO; } +static inline unsigned int dma_get_max_seg_number(struct device *dev) +{ + return dev->dma_parms ? dev->dma_parms->max_segment_number : 1; +} + +static inline unsigned int dma_set_max_seg_number(struct device *dev, + unsigned int number) +{ + if (dev->dma_parms) { + dev->dma_parms->max_segment_number = number; + return 0; + } else + return -EIO; +} + static inline unsigned long dma_get_seg_boundary(struct device *dev) { return dev->dma_parms ?