linux-kernel - Re: [PATCH 0/3] uio/dma-buf: Give UIO users access to DMA addresses.

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Message-ID: <Z_yjNgY3dVnA5OVz@infradead.org>
Date: Sun, 13 Apr 2025 22:55:02 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Bastien Curutchet <bastien.curutchet@...tlin.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] uio/dma-buf: Give UIO users access to DMA addresses.

On Thu, Apr 10, 2025 at 04:53:17PM +0200, Bastien Curutchet wrote:
> Hi all,
> 
> Many UIO users performing DMA from their UIO device need to access the
> DMA addresses of the allocated buffers. There are out-of-tree drivers
> that allow to do it but nothing in the mainline.

In which case it does not matter at all for mainline.

FYI the proper and safe way to do DMA from userspace is to use
vfio/iommufd.