From: Christoph Hellwig <hch@lst.de>
To: "Christian König" <christian.koenig@amd.com>
Cc: Pavel Begunkov <asml.silence@gmail.com>,
linux-block@vger.kernel.org, io-uring@vger.kernel.org,
Vishal Verma <vishal1.verma@intel.com>,
tushar.gohad@intel.com, Keith Busch <kbusch@kernel.org>,
Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>,
Sagi Grimberg <sagi@grimberg.me>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Sumit Semwal <sumit.semwal@linaro.org>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-fsdevel@vger.kernel.org, linux-media@vger.kernel.org,
dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org
Subject: Re: [RFC v2 01/11] file: add callback for pre-mapping dmabuf
Date: Thu, 4 Dec 2025 12:07:09 +0100 [thread overview]
Message-ID: <20251204110709.GA22971@lst.de> (raw)
In-Reply-To: <7b2017f4-02a3-482a-a173-bb16b895c0cb@amd.com>
On Thu, Dec 04, 2025 at 11:46:45AM +0100, Christian König wrote:
> On 11/23/25 23:51, Pavel Begunkov wrote:
> > Add a file callback that maps a dmabuf for the given file and returns
> > an opaque token of type struct dma_token representing the mapping.
>
> I'm really scratching my head what you mean with that?
>
> And why the heck would we need to pass a DMA-buf to a struct file?
I find the naming pretty confusing a well. But what this does is to
tell the file system/driver that it should expect a future
read_iter/write_iter operation that takes data from / puts data into
the dmabuf passed to this operation.
next prev parent reply other threads:[~2025-12-04 11:07 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-23 22:51 [RFC v2 00/11] Add dmabuf read/write via io_uring Pavel Begunkov
2025-11-23 22:51 ` [RFC v2 01/11] file: add callback for pre-mapping dmabuf Pavel Begunkov
2025-12-04 10:42 ` Christoph Hellwig
2025-12-12 1:02 ` Pavel Begunkov
2025-12-04 10:46 ` Christian König
2025-12-04 11:07 ` Christoph Hellwig [this message]
2025-12-04 11:09 ` Christian König
2025-12-04 13:10 ` Christoph Hellwig
2025-11-23 22:51 ` [RFC v2 02/11] iov_iter: introduce iter type for pre-registered dma Pavel Begunkov
2025-12-04 10:43 ` Christoph Hellwig
2025-12-12 1:06 ` Pavel Begunkov
2025-11-23 22:51 ` [RFC v2 03/11] block: move around bio flagging helpers Pavel Begunkov
2025-12-04 10:43 ` Christoph Hellwig
2025-12-12 1:08 ` Pavel Begunkov
2025-11-23 22:51 ` [RFC v2 04/11] block: introduce dma token backed bio type Pavel Begunkov
2025-12-04 10:48 ` Christoph Hellwig
2025-11-23 22:51 ` [RFC v2 05/11] block: add infra to handle dmabuf tokens Pavel Begunkov
2025-11-24 13:38 ` Anuj gupta
2025-12-04 10:56 ` Christoph Hellwig
2025-12-12 1:56 ` Pavel Begunkov
2025-12-04 13:08 ` Christoph Hellwig
2025-11-23 22:51 ` [RFC v2 06/11] nvme-pci: add support for dmabuf reggistration Pavel Begunkov
2025-11-24 13:40 ` Anuj gupta
2025-12-04 11:00 ` Christoph Hellwig
2025-12-04 19:07 ` Keith Busch
2025-11-23 22:51 ` [RFC v2 07/11] nvme-pci: implement dma_token backed requests Pavel Begunkov
2025-12-04 11:04 ` Christoph Hellwig
2025-11-23 22:51 ` [RFC v2 08/11] io_uring/rsrc: add imu flags Pavel Begunkov
2025-11-23 22:51 ` [RFC v2 09/11] io_uring/rsrc: extended reg buffer registration Pavel Begunkov
2025-11-23 22:51 ` [RFC v2 10/11] io_uring/rsrc: add dmabuf-backed buffer registeration Pavel Begunkov
2025-11-23 22:51 ` [RFC v2 11/11] io_uring/rsrc: implement dmabuf regbuf import Pavel Begunkov
2025-11-24 10:33 ` [RFC v2 00/11] Add dmabuf read/write via io_uring Christian König
2025-11-24 11:30 ` Pavel Begunkov
2025-11-24 14:17 ` Christian König
2025-11-25 13:52 ` Pavel Begunkov
2025-11-25 14:21 ` Christian König
2025-11-25 19:40 ` Pavel Begunkov
2025-11-24 13:35 ` Anuj gupta
2025-11-25 12:35 ` Pavel Begunkov
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