From patchwork Fri Mar 8 17:00:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 13587069 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 2A910C54E4A for ; Fri, 8 Mar 2024 17:01:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7E73710F50A; Fri, 8 Mar 2024 17:01:17 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=crapouillou.net header.i=@crapouillou.net header.b="j+J1M/DP"; dkim-atps=neutral Received: from aposti.net (aposti.net [89.234.176.197]) by gabe.freedesktop.org (Postfix) with ESMTPS id 21B1F1132D9 for ; Fri, 8 Mar 2024 17:01:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1709917267; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tTnfJ7u5064ZSLz1RAOyX6FudlHZyR78isy9u39T0jc=; b=j+J1M/DPupEG6sqwwm4ck8EG7HNvYd4r/7swDMRhedkJWvkMeV0rdiEKCMBlmZbmNew1gp BDk7EF8C303dbKbGfiBeJfyFKqY8yCxN/9otis4PjJBN3IcONKiZ2ra4NYIECauoVJSo5V zbhYF3d2/pgVq7V0tPIN00WUuuFM8yI= From: Paul Cercueil To: Jonathan Cameron , =?utf-8?q?Christian_K=C3=B6nig?= , Jonathan Corbet , Lars-Peter Clausen , Vinod Koul , Sumit Semwal Cc: Nuno Sa , Michael Hennerich , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, linux-iio@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Paul Cercueil Subject: [PATCH v8 1/6] dmaengine: Add API function dmaengine_prep_peripheral_dma_vec() Date: Fri, 8 Mar 2024 18:00:41 +0100 Message-ID: <20240308170046.92899-2-paul@crapouillou.net> In-Reply-To: <20240308170046.92899-1-paul@crapouillou.net> References: <20240308170046.92899-1-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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This function can be used to initiate a scatter-gather DMA transfer, where the address and size of each segment is located in one entry of the dma_vec array. The major difference with dmaengine_prep_slave_sg() is that it supports specifying the lengths of each DMA transfer; as trying to override the length of the transfer with dmaengine_prep_slave_sg() is a very tedious process. The introduction of a new API function is also justified by the fact that scatterlists are on their way out. Note that dmaengine_prep_interleaved_dma() is not helpful either in that case, as it assumes that the address of each segment will be higher than the one of the previous segment, which we just cannot guarantee in case of a scatter-gather transfer. Signed-off-by: Paul Cercueil Signed-off-by: Nuno Sa --- v3: New patch v5: Replace with function dmaengine_prep_slave_dma_vec(), and struct 'dma_vec'. Note that at some point we will need to support cyclic transfers using dmaengine_prep_slave_dma_vec(). Maybe with a new "flags" parameter to the function? v7: - Renamed *device_prep_slave_dma_vec() -> device_prep_peripheral_dma_vec(); - Added a new flag parameter to the function as agreed between Paul and Vinod. I renamed the first parameter to prep_flags as it's supposed to be used (I think) with enum dma_ctrl_flags. I'm not really sure how that API can grow but I was thinking in just having a bool cyclic parameter (as the first intention of the flags is to support cyclic transfers) but ended up "respecting" the previously agreed approach. --- include/linux/dmaengine.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 752dbde4cec1..856df8cd9a4e 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -160,6 +160,16 @@ struct dma_interleaved_template { struct data_chunk sgl[]; }; +/** + * struct dma_vec - DMA vector + * @addr: Bus address of the start of the vector + * @len: Length in bytes of the DMA vector + */ +struct dma_vec { + dma_addr_t addr; + size_t len; +}; + /** * enum dma_ctrl_flags - DMA flags to augment operation preparation, * control completion, and communicate status. @@ -910,6 +920,10 @@ struct dma_device { struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)( struct dma_chan *chan, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_peripheral_dma_vec)( + struct dma_chan *chan, const struct dma_vec *vecs, + size_t nents, enum dma_transfer_direction direction, + unsigned long prep_flags, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_slave_sg)( struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction direction, @@ -973,6 +987,19 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single( dir, flags, NULL); } +static inline struct dma_async_tx_descriptor *dmaengine_prep_peripheral_dma_vec( + struct dma_chan *chan, const struct dma_vec *vecs, size_t nents, + enum dma_transfer_direction dir, unsigned long prep_flags, + unsigned long flags) +{ + if (!chan || !chan->device || !chan->device->device_prep_peripheral_dma_vec) + return NULL; + + return chan->device->device_prep_peripheral_dma_vec(chan, vecs, nents, + dir, prep_flags, + flags); +} + static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg( struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction dir, unsigned long flags)