linux-kernel - Re: [PATCH] PCI: endpoint: Add DMA to Linux PCI EP Framework

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Message-ID: <20190603044251.GS15118@vkoul-mobl>
Date:   Mon, 3 Jun 2019 10:12:51 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Alan Mikhak <alan.mikhak@...ive.com>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "wen.yang99@....com.cn" <wen.yang99@....com.cn>,
        "kjlu@....edu" <kjlu@....edu>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>
Subject: Re: [PATCH] PCI: endpoint: Add DMA to Linux PCI EP Framework

Hi Kishon,

On 03-06-19, 09:54, Kishon Vijay Abraham I wrote:

> right. For the endpoint case, drivers/pci/controller should register with the
> dmaengine i.e if the controller has aN embedded DMA (I think it should be okay
> to keep that in drivers/pci/controller itself instead of drivers/dma) and
> drivers/pci/endpoint/functions/ should use dmaengine API's (Depending on the
> platform, this will either use system DMA or DMA within the PCI controller).

Typically I would prefer the driver to be part of drivers/dma.
Would this be a standalone driver or part of the endpoint driver. In
former case we can move to dmaengine for latter i guess it makes sense
to stay in PCI

Thanks
-- 
~Vinod