From patchwork Fri Feb 12 10:20:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 12084979 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,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 65FC6C433DB for ; Fri, 12 Feb 2021 10:19:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13B2A64D9E for ; Fri, 12 Feb 2021 10:19:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230468AbhBLKS6 (ORCPT ); Fri, 12 Feb 2021 05:18:58 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:63242 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230295AbhBLKSy (ORCPT ); Fri, 12 Feb 2021 05:18:54 -0500 Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 11CAFOpp001736; Fri, 12 Feb 2021 05:18:02 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 36hrw93ca5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 12 Feb 2021 05:18:02 -0500 Received: from SCSQMBX10.ad.analog.com (SCSQMBX10.ad.analog.com [10.77.17.5]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 11CAI0hh025137 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 12 Feb 2021 05:18:01 -0500 Received: from SCSQMBX11.ad.analog.com (10.77.17.10) by SCSQMBX10.ad.analog.com (10.77.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.721.2; Fri, 12 Feb 2021 02:17:59 -0800 Received: from zeus.spd.analog.com (10.66.68.11) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Fri, 12 Feb 2021 02:17:59 -0800 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 11CAHu5j029319; Fri, 12 Feb 2021 05:17:56 -0500 From: Alexandru Ardelean To: , CC: , , , , , Alexandru Ardelean Subject: [RFC PATCH 0/5] iio: buffer: add output buffer and cyclic mode Date: Fri, 12 Feb 2021 12:20:16 +0200 Message-ID: <20210212102021.47276-1-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.737 definitions=2021-02-12_03:2021-02-12,2021-02-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 spamscore=0 mlxlogscore=930 clxscore=1015 adultscore=0 priorityscore=1501 bulkscore=0 mlxscore=0 phishscore=0 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102120077 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Largely, an adaptation of Lars' work, applied on the IIO multi-buffer support + high-speed/mmap support [1]. Found here: https://github.com/larsclausen/linux/commits/iio-high-speed-5.10 But this isn't tested. [1] Requires that these sets be applied (in this order): * https://lore.kernel.org/linux-iio/20210211122452.78106-1-alexandru.ardelean@analog.com/T/#t * https://lore.kernel.org/linux-iio/20210212101143.18993-1-alexandru.ardelean@analog.com/T/#t Some of the variation from the original work are: 1. It's applied on top of the multibuffer support; so the direction of the data is set per iio_buffer, and not iio_dev 2. Cyclic mode is a separate patch 3. devm_iio_dmaengine_buffer_alloc() requires the definition of 'enum iio_buffer_direction'; which means that 'linux/iio/buffer.h' needs to be included in buffer-dma.h; Lars tried to use a bool, but using the enum seems a bit more consistent and allows us to maybe go down the route of both I/O buffers (some day); not sure if that's sane or not (you never know) 4. Various re-formatting; and added some docstrings where I remembered to so so Lars-Peter Clausen (5): iio: Add output buffer support iio: kfifo-buffer: Add output buffer support iio: buffer-dma: Allow to provide custom buffer ops iio: buffer-dma: Add output buffer support iio: buffer-dma: add support for cyclic DMA transfers drivers/iio/adc/adi-axi-adc.c | 5 +- drivers/iio/buffer/industrialio-buffer-dma.c | 120 ++++++++++++++++-- .../buffer/industrialio-buffer-dmaengine.c | 57 +++++++-- drivers/iio/buffer/kfifo_buf.c | 50 ++++++++ drivers/iio/industrialio-buffer.c | 110 +++++++++++++++- include/linux/iio/buffer-dma.h | 11 +- include/linux/iio/buffer-dmaengine.h | 7 +- include/linux/iio/buffer.h | 7 + include/linux/iio/buffer_impl.h | 11 ++ include/uapi/linux/iio/buffer.h | 1 + 10 files changed, 348 insertions(+), 31 deletions(-)