linux-kernel - Re: [PATCH 1/2] uio: introduce UIO_MEM_DMA

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Date: Wed, 31 Jan 2024 13:28:53 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Chris Leech <cleech@...hat.com>
Cc: Nilesh Javali <njavali@...vell.com>, Christoph Hellwig <hch@....de>,
	John Meneghini <jmeneghi@...hat.com>, Lee Duncan <lduncan@...e.com>,
	Mike Christie <michael.christie@...cle.com>,
	Hannes Reinecke <hare@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	GR-QLogic-Storage-Upstream@...vell.com
Subject: Re: [PATCH 1/2] uio: introduce UIO_MEM_DMA_COHERENT type

On Wed, Jan 31, 2024 at 11:17:31AM -0800, Chris Leech wrote:
> Add a UIO memtype specifically for sharing dma_alloc_coherent
> memory with userspace, backed by dma_mmap_coherent.
> 
> This is mainly for the bnx2/bnx2x/bnx2i "cnic" interface, although there
> are a few other uio drivers which map dma_alloc_coherent memory and
> could be converted to use dma_mmap_coherent as well.

What other drivers could use this?  Patches doing the conversion would
be welcome, otherwise, again, I am very loath to take this
one-off-change for just a single driver that shouldn't be doing this in
the first place :)

thanks,

greg k-h