From patchwork Fri Feb 12 10:20:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 12084987 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 024D0C4332E for ; Fri, 12 Feb 2021 10:19:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CEFCD64D9E for ; Fri, 12 Feb 2021 10:19:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230494AbhBLKTI (ORCPT ); Fri, 12 Feb 2021 05:19:08 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:5908 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230470AbhBLKS7 (ORCPT ); Fri, 12 Feb 2021 05:18:59 -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 11CAFN02001703; Fri, 12 Feb 2021 05:18:08 -0500 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com with ESMTP id 36hrw93cae-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 12 Feb 2021 05:18:07 -0500 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 11CAI6QI023461 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Fri, 12 Feb 2021 05:18:06 -0500 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Fri, 12 Feb 2021 05:18:05 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Fri, 12 Feb 2021 05:18:05 -0500 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 11CAHu5o029319; Fri, 12 Feb 2021 05:18:04 -0500 From: Alexandru Ardelean To: , CC: , , , , , Alexandru Ardelean Subject: [RFC PATCH 5/5] iio: buffer-dma: add support for cyclic DMA transfers Date: Fri, 12 Feb 2021 12:20:21 +0200 Message-ID: <20210212102021.47276-6-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210212102021.47276-1-alexandru.ardelean@analog.com> References: <20210212102021.47276-1-alexandru.ardelean@analog.com> 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=999 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 From: Lars-Peter Clausen This change adds support for cyclic DMA transfers using the IIO buffer DMA infrastructure. To do this, userspace must set the IIO_BUFFER_BLOCK_FLAG_CYCLIC flag on the block when enqueueing them via the ENQUEUE_BLOCK ioctl(). Signed-off-by: Lars-Peter Clausen Signed-off-by: Alexandru Ardelean --- .../buffer/industrialio-buffer-dmaengine.c | 24 ++++++++++++------- include/uapi/linux/iio/buffer.h | 1 + 2 files changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c index 013cc7c1ecf4..94c93a636ad4 100644 --- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c +++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c @@ -82,14 +82,22 @@ static int iio_dmaengine_buffer_submit_block(struct iio_dma_buffer_queue *queue, direction = dmaengine_buffer->is_tx ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; - desc = dmaengine_prep_slave_single(dmaengine_buffer->chan, - block->phys_addr, block->block.bytes_used, direction, - DMA_PREP_INTERRUPT); - if (!desc) - return -ENOMEM; - - desc->callback_result = iio_dmaengine_buffer_block_done; - desc->callback_param = block; + if (block->block.flags & IIO_BUFFER_BLOCK_FLAG_CYCLIC) { + desc = dmaengine_prep_dma_cyclic(dmaengine_buffer->chan, + block->phys_addr, block->block.bytes_used, + block->block.bytes_used, direction, 0); + if (!desc) + return -ENOMEM; + } else { + desc = dmaengine_prep_slave_single(dmaengine_buffer->chan, + block->phys_addr, block->block.bytes_used, direction, + DMA_PREP_INTERRUPT); + if (!desc) + return -ENOMEM; + + desc->callback_result = iio_dmaengine_buffer_block_done; + desc->callback_param = block; + } cookie = dmaengine_submit(desc); if (dma_submit_error(cookie)) diff --git a/include/uapi/linux/iio/buffer.h b/include/uapi/linux/iio/buffer.h index 70ad3aea01ea..0e0c95f1c38b 100644 --- a/include/uapi/linux/iio/buffer.h +++ b/include/uapi/linux/iio/buffer.h @@ -13,6 +13,7 @@ struct iio_buffer_block_alloc_req { }; #define IIO_BUFFER_BLOCK_FLAG_TIMESTAMP_VALID (1 << 0) +#define IIO_BUFFER_BLOCK_FLAG_CYCLIC (1 << 1) struct iio_buffer_block { __u32 id;