From patchwork Mon Nov 15 14:22:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 12619619 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C537EC433F5 for ; Mon, 15 Nov 2021 14:23:00 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8686161B97 for ; Mon, 15 Nov 2021 14:23:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8686161B97 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=crapouillou.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 58AB66E40A; Mon, 15 Nov 2021 14:22:59 +0000 (UTC) Received: from aposti.net (aposti.net [89.234.176.197]) by gabe.freedesktop.org (Postfix) with ESMTPS id 800BA6E40A for ; Mon, 15 Nov 2021 14:22:57 +0000 (UTC) From: Paul Cercueil To: Jonathan Cameron Subject: [PATCH 13/15] iio: core: Add support for cyclic buffers Date: Mon, 15 Nov 2021 14:22:41 +0000 Message-Id: <20211115142243.60605-2-paul@crapouillou.net> In-Reply-To: <20211115142243.60605-1-paul@crapouillou.net> References: <20211115141925.60164-1-paul@crapouillou.net> <20211115142243.60605-1-paul@crapouillou.net> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Cercueil , Michael Hennerich , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, =?utf-8?q?Ch?= =?utf-8?q?ristian_K=C3=B6nig?= , linaro-mm-sig@lists.linaro.org, Alexandru Ardelean , linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Introduce a new flag IIO_BUFFER_DMABUF_CYCLIC in the "flags" field of the iio_dmabuf uapi structure. When set, the DMABUF enqueued with the enqueue ioctl will be endlessly repeated on the TX output, until the buffer is disabled. Signed-off-by: Paul Cercueil Reviewed-by: Alexandru Ardelean --- drivers/iio/industrialio-buffer.c | 5 +++++ include/uapi/linux/iio/buffer.h | 3 ++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 30910e6c2346..41bc51c88002 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -1600,6 +1600,11 @@ static int iio_buffer_enqueue_dmabuf(struct iio_buffer *buffer, if (dmabuf.flags & ~IIO_BUFFER_DMABUF_SUPPORTED_FLAGS) return -EINVAL; + /* Cyclic flag is only supported on output buffers */ + if ((dmabuf.flags & IIO_BUFFER_DMABUF_CYCLIC) && + buffer->direction != IIO_BUFFER_DIRECTION_OUT) + return -EINVAL; + return buffer->access->enqueue_dmabuf(buffer, &dmabuf); } diff --git a/include/uapi/linux/iio/buffer.h b/include/uapi/linux/iio/buffer.h index e4621b926262..2d541d038c02 100644 --- a/include/uapi/linux/iio/buffer.h +++ b/include/uapi/linux/iio/buffer.h @@ -7,7 +7,8 @@ #include -#define IIO_BUFFER_DMABUF_SUPPORTED_FLAGS 0x00000000 +#define IIO_BUFFER_DMABUF_CYCLIC (1 << 0) +#define IIO_BUFFER_DMABUF_SUPPORTED_FLAGS 0x00000001 /** * struct iio_dmabuf_alloc_req - Descriptor for allocating IIO DMABUFs