From patchwork Wed Sep 30 09:13:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 11808509 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2146A1668 for ; Wed, 30 Sep 2020 09:14:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0208E20738 for ; Wed, 30 Sep 2020 09:14:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="Eu0tzELm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728744AbgI3JOL (ORCPT ); Wed, 30 Sep 2020 05:14:11 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:35022 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728638AbgI3JOK (ORCPT ); Wed, 30 Sep 2020 05:14:10 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 08U9E5Gn034888; Wed, 30 Sep 2020 04:14:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1601457245; bh=24q5eD4y4xZgELs8UTDdNZFf1mU01Jty7BUIc3+XGk4=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=Eu0tzELmEDYfv6KlmUeoSiKtMyo3jDlvSWanA9cxOXpb530t1NVJZJ2KRh3PrzdPB Uoosxfb4Lh5eqygJHmKdCE4B9zP14hquHRZJlTQiZOkFNwOo5vsfxSD0I1b0mb/g1h XNEoGZw15iUPd3soBB4aqVyBjpbuISGiBfQ1PRMo= Received: from DFLE103.ent.ti.com (dfle103.ent.ti.com [10.64.6.24]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id 08U9E5fg121766; Wed, 30 Sep 2020 04:14:05 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Wed, 30 Sep 2020 04:14:05 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Wed, 30 Sep 2020 04:14:05 -0500 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 08U9DuJZ116385; Wed, 30 Sep 2020 04:14:02 -0500 From: Peter Ujfalusi To: , , , , CC: , , , , , , Subject: [PATCH 02/18] dmaengine: Add support for per channel coherency handling Date: Wed, 30 Sep 2020 12:13:56 +0300 Message-ID: <20200930091412.8020-3-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200930091412.8020-1-peter.ujfalusi@ti.com> References: <20200930091412.8020-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org If the DMA device supports per channel coherency configuration (a channel can be configured to have coherent or not coherent view) then a single device (the DMA controller's device) can not be used for dma_api for all channels as channels can have different coherency. Introduce custom_dma_mapping flag for the dma_chan and a new helper to get the device pointer to be used for dma_api for the given channel. Client drivers should be updated to be able to support per channel coherency by: - dma_map_single(chan->device->dev, ptr, size, DMA_TO_DEVICE); + struct device *dma_dev = dmaengine_get_dma_device(chan); + + dma_map_single(dma_dev, ptr, size, DMA_TO_DEVICE); Signed-off-by: Peter Ujfalusi --- include/linux/dmaengine.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index d6197fe875af..182a1a2e7793 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -357,11 +357,14 @@ struct dma_chan { * @chan: driver channel device * @device: sysfs device * @dev_id: parent dma_device dev_id + * @chan_dma_dev: The channel is using custom/different dma-mapping + * compared to the parent dma_device */ struct dma_chan_dev { struct dma_chan *chan; struct device device; int dev_id; + bool chan_dma_dev; }; /** @@ -1613,4 +1616,13 @@ dmaengine_get_direction_text(enum dma_transfer_direction dir) return "invalid"; } } + +static inline struct device *dmaengine_get_dma_device(struct dma_chan *chan) +{ + if (chan->dev->chan_dma_dev) + return &chan->dev->device; + + return chan->device->dev; +} + #endif /* DMAENGINE_H */