From: Christoph Hellwig <hch@lst.de>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: "Ming Lei" <ming.lei@redhat.com>,
"Christoph Hellwig" <hch@lst.de>,
"Christian König" <christian.koenig@amd.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>,
"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: Wed, 7 Jan 2026 07:18:51 +0100 [thread overview]
Message-ID: <20260107061851.GA15324@lst.de> (raw)
In-Reply-To: <a96e327d-3fef-4d08-87e9-c65866223967@gmail.com>
On Tue, Jan 06, 2026 at 07:51:12PM +0000, Pavel Begunkov wrote:
>> But I am wondering why not make it as one subsystem interface, such as nvme
>> ioctl, then the whole implementation can be simplified a lot. It is reasonable
>> because subsystem is exactly the side for consuming/importing the dma-buf.
>
> It's not an nvme specific interface, and so a file op was much more
> convenient.
It is the much better abstraction. Also the nvme subsystems is not
an actor, and registering things to the subsystems does not work.
The nvme controller is the entity that does the dma mapping, and this
interface works very well for that.
next prev parent reply other threads:[~2026-01-07 6:18 UTC|newest]
Thread overview: 54+ 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
2025-12-04 11:09 ` Christian König
2025-12-04 13:10 ` Christoph Hellwig
2026-01-04 1:42 ` Ming Lei
2026-01-06 19:51 ` Pavel Begunkov
2026-01-07 6:18 ` Christoph Hellwig [this message]
2026-01-07 15:56 ` Christian König
2026-01-07 16:01 ` Christoph Hellwig
2026-01-08 2:19 ` Ming Lei
2026-01-08 10:17 ` Christoph Hellwig
2026-01-09 2:10 ` Ming Lei
2026-01-09 5:58 ` 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
2025-12-12 20:10 ` Jens Axboe
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
2026-01-21 7:37 ` Nitesh Shetty
2026-01-22 11:46 ` Pavel Begunkov
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
2026-01-04 1:46 ` Ming Lei
2026-01-06 19:32 ` 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
2025-12-12 19:37 ` (subset) " Jens Axboe
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