From: "Christian König" <christian.koenig@amd.com>
To: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Bastien Curutchet <bastien.curutchet@bootlin.com>,
Sumit Semwal <sumit.semwal@linaro.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] uio/dma-buf: Give UIO users access to DMA addresses.
Date: Mon, 14 Apr 2025 10:59:41 +0200 [thread overview]
Message-ID: <9598082e-3719-4436-bdc9-15faa19837d0@amd.com> (raw)
In-Reply-To: <20250414101729.598c1422@windsurf>
Am 14.04.25 um 10:17 schrieb Thomas Petazzoni:
> Hello Christian,
>
> On Fri, 11 Apr 2025 14:41:56 +0200
> Christian König <christian.koenig@amd.com> wrote:
>
>> But anyway please note that when you want to create new UAPI you need
>> to provide an open source user of it. E.g. link to a repository or
>> something similar in the covert letter should do it.
> Could you clarify what is the "reference" user-space user of UIO that
> exists today?
I honestly don't know. I have never looked into UIO before this patch set arrived.
What I mean is that the general rule to justify adding UAPI to the Linux kernel is that you need to have an open source user of that UAPI.
In other words for UIO this means that you *can't* do things like exposing some kernel functionality like DMA-buf through UIO and then write a binary only driver on top of it.
Regards,
Christian.
>
> Thomas
next prev parent reply other threads:[~2025-04-14 8:59 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-10 14:53 Bastien Curutchet
2025-04-10 14:53 ` [PATCH 1/3] dma-buf: Allow heap that doesn't provide map_buf/unmap_buf Bastien Curutchet
2025-04-10 14:53 ` [PATCH 2/3] dma-buf: Add DMA_BUF_IOCTL_GET_DMA_ADDR Bastien Curutchet
2025-04-11 18:34 ` Nicolas Dufresne
2025-04-29 6:39 ` Simona Vetter
2025-04-29 8:12 ` Christian König
2025-04-10 14:53 ` [PATCH 3/3] uio: Add UIO_DMABUF_HEAP Bastien Curutchet
2025-04-11 18:41 ` Nicolas Dufresne
2025-04-10 16:29 ` [PATCH 0/3] uio/dma-buf: Give UIO users access to DMA addresses Christian König
2025-04-10 19:43 ` Thomas Petazzoni
[not found] ` <b596c9af-c0e3-4557-b45a-462a33179235@amd.com>
2025-04-11 8:14 ` Bastien Curutchet
2025-04-11 12:41 ` Christian König
2025-04-14 8:17 ` Thomas Petazzoni
2025-04-14 8:59 ` Christian König [this message]
2025-04-14 5:55 ` Christoph Hellwig
2025-04-14 8:24 ` Thomas Petazzoni
2025-04-14 9:11 ` Christian König
2025-04-14 11:52 ` Thomas Petazzoni
2025-04-14 11:24 ` Christoph Hellwig
2025-04-14 11:48 ` Thomas Petazzoni
2025-04-14 17:08 ` Andrew Davis
2025-04-14 19:21 ` Thomas Petazzoni
2025-04-14 20:13 ` Andrew Davis
2025-04-22 18:16 ` Jason Gunthorpe
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