From patchwork Mon Feb 7 12:59:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 12737239 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7FA68C43219 for ; Mon, 7 Feb 2022 13:28:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380563AbiBGN2i (ORCPT ); Mon, 7 Feb 2022 08:28:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1386697AbiBGNFd (ORCPT ); Mon, 7 Feb 2022 08:05:33 -0500 Received: from aposti.net (aposti.net [89.234.176.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3AA03C043181; Mon, 7 Feb 2022 05:05:33 -0800 (PST) From: Paul Cercueil To: Jonathan Cameron Cc: Michael Hennerich , Lars-Peter Clausen , =?utf-8?q?Christian_K=C3=B6nig?= , Sumit Semwal , Jonathan Corbet , Alexandru Ardelean , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, Paul Cercueil Subject: [PATCH v2 00/12] iio: buffer-dma: write() and new DMABUF based API Date: Mon, 7 Feb 2022 12:59:21 +0000 Message-Id: <20220207125933.81634-1-paul@crapouillou.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Hi Jonathan, This is the V2 of my patchset that introduces a new userspace interface based on DMABUF objects to complement the fileio API, and adds write() support to the existing fileio API. Changes since v1: - the patches that were merged in v1 have been (obviously) dropped from this patchset; - the patch that was setting the write-combine cache setting has been dropped as well, as it was simply not useful. - [01/12]: * Only remove the outgoing queue, and keep the incoming queue, as we want the buffer to start streaming data as soon as it is enabled. * Remove IIO_BLOCK_STATE_DEQUEUED, since it is now functionally the same as IIO_BLOCK_STATE_DONE. - [02/12]: * Fix block->state not being reset in iio_dma_buffer_request_update() for output buffers. * Only update block->bytes_used once and add a comment about why we update it. * Add a comment about why we're setting a different state for output buffers in iio_dma_buffer_request_update() * Remove useless cast to bool (!!) in iio_dma_buffer_io() - [05/12]: Only allow the new IOCTLs on the buffer FD created with IIO_BUFFER_GET_FD_IOCTL(). - [12/12]: * Explicitly state that the new interface is optional and is not implemented by all drivers. * The IOCTLs can now only be called on the buffer FD returned by IIO_BUFFER_GET_FD_IOCTL. * Move the page up a bit in the index since it is core stuff and not driver-specific. The patches not listed here have not been modified since v1. Cheers, -Paul Alexandru Ardelean (1): iio: buffer-dma: split iio_dma_buffer_fileio_free() function Paul Cercueil (11): iio: buffer-dma: Get rid of outgoing queue iio: buffer-dma: Enable buffer write support iio: buffer-dmaengine: Support specifying buffer direction iio: buffer-dmaengine: Enable write support iio: core: Add new DMABUF interface infrastructure iio: buffer-dma: Use DMABUFs instead of custom solution iio: buffer-dma: Implement new DMABUF based userspace API iio: buffer-dmaengine: Support new DMABUF based userspace API iio: core: Add support for cyclic buffers iio: buffer-dmaengine: Add support for cyclic buffers Documentation: iio: Document high-speed DMABUF based API Documentation/driver-api/dma-buf.rst | 2 + Documentation/iio/dmabuf_api.rst | 94 +++ Documentation/iio/index.rst | 2 + drivers/iio/adc/adi-axi-adc.c | 3 +- drivers/iio/buffer/industrialio-buffer-dma.c | 610 ++++++++++++++---- .../buffer/industrialio-buffer-dmaengine.c | 42 +- drivers/iio/industrialio-buffer.c | 60 ++ include/linux/iio/buffer-dma.h | 38 +- include/linux/iio/buffer-dmaengine.h | 5 +- include/linux/iio/buffer_impl.h | 8 + include/uapi/linux/iio/buffer.h | 30 + 11 files changed, 749 insertions(+), 145 deletions(-) create mode 100644 Documentation/iio/dmabuf_api.rst