From patchwork Tue Sep 12 10:44:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 812768 Return-Path: X-Original-To: incoming-imx@patchwork.ozlabs.org Delivered-To: patchwork-incoming-imx@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.infradead.org (client-ip=65.50.211.133; helo=bombadil.infradead.org; envelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="O0SjZsr3"; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ti.com header.i=@ti.com header.b="U1AcmKBX"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xs1rJ0Pfkz9s7g for ; Tue, 12 Sep 2017 20:54:08 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=AuOQIhh+GxMKlEddae055xsa2dGfgtci/IbFgVrszJ8=; b=O0SjZsr3Tlw3CZ TxvutZydCKgsaXLw2N+i83aQZTLk4Snj5Yvvpo1fgf4uhuo9KRUICSBwNT2FRgKyHeVj1fonsTuYi DVr4IYRdm5XOybtyfIDzm/8XW4a4NSP1VvCiTM+QnNcK5rjUH4UVWsp4zfwR+GmhJ03GBn3dQfvT+ BRF4SQ8PhUQmJG6Pj3UYR8KU5IzqNe2Cv9o+YAX7dEbhg8YjG1jXZeT6ngvFdypfS28GieWq58bzf ELtzbyjWwZhT0liYUWTS8ooLxP0oLo9nvq5WlSLShQrnMQpVs7+Uuta9otf90R+A+4TWyAnjb18Cs zmvQaKOnLIh77Rl73WxA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dripO-0006EP-Mi; Tue, 12 Sep 2017 10:54:02 +0000 Received: from fllnx209.ext.ti.com ([198.47.19.16]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1drigx-0000O9-KC for linux-arm-kernel@lists.infradead.org; Tue, 12 Sep 2017 10:45:27 +0000 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by fllnx209.ext.ti.com (8.15.1/8.15.1) with ESMTP id v8CAiWdh021906; Tue, 12 Sep 2017 05:44:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1505213072; bh=aoFkug75jd6+U4VP6JlBVvi4jqeVWec2e+KRQ9inY/E=; h=From:To:CC:Subject:Date; b=U1AcmKBXTI55I8zRluCPCQmMyEuRSRGSJg1PJ5HgEIG8Wt5BHexO/+OX8TrDVtmNJ Iqd5rDCKFgMo80gcTiH3ALbTWtQoKVquvhBC7DBCj9VU46kgxrMW2mJIIprPFjnJkQ AntjdDLw1FqPoMV/YubF7Vwjnbc0yjGUyUsAMLHo= Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id v8CAiRUX020134; Tue, 12 Sep 2017 05:44:27 -0500 Received: from DFLE109.ent.ti.com (10.64.6.30) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.845.34; Tue, 12 Sep 2017 05:44:26 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DFLE109.ent.ti.com (10.64.6.30) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.845.34 via Frontend Transport; Tue, 12 Sep 2017 05:44:26 -0500 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id v8CAiOu1007788; Tue, 12 Sep 2017 05:44:24 -0500 From: Peter Ujfalusi To: , Subject: [PATCH 0/5] dmaengine: core/edma/omap-dma: maximum SG len reporting Date: Tue, 12 Sep 2017 13:44:19 +0300 Message-ID: <20170912104424.18495-1-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.14.1 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170912_034520_146288_9903D0CF X-CRM114-Status: UNSURE ( 5.64 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.0 (--) X-Spam-Report: SpamAssassin version 3.4.1 on bombadil.infradead.org summary: Content analysis details: (-2.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [198.47.19.16 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dmaengine@vger.kernel.org, t-kristo@ti.com, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org Hi, Both TI eDMA and sDMA have limitation on the number of bursts it can handle within one trasnfer (CCNT in eDMA and CFN in sDMA are 16bit unsigned counters). If the the length of the SG in the sglist is bigger than what can be supported we either have corrupted data or failure in the setup phase. Add device_get_max_len() callback to devices where they can report such length restriction to client drivers so they can set up their SGlist that each element's length is going to be within the supported range. The first two patch is not strictly related to this issue, but it is needed that both eDMA and sDMA will have valid max_burst length. Regards, Peter --- Peter Ujfalusi (5): dmaengine: edma: Implement protection for invalid max_burst dmaengine: omap-dma: Implement protection for invalid max_burst dmaengine: Support for querying maximum trasnfer length (of an SG element) dmaengine: edma: Implement device_get_max_len callback dmaengine: omap-dma: Implement device_get_max_len callback drivers/dma/edma.c | 28 ++++++++++++++++++++++++++++ drivers/dma/omap-dma.c | 28 ++++++++++++++++++++++++++++ include/linux/dmaengine.h | 14 ++++++++++++++ 3 files changed, 70 insertions(+)