From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Christoph Hellwig" <hch@lst.de>,
"Leon Romanovsky" <leon@kernel.org>,
"Jens Axboe" <axboe@kernel.dk>,
"Robin Murphy" <robin.murphy@arm.com>,
"Joerg Roedel" <joro@8bytes.org>, "Will Deacon" <will@kernel.org>,
"Keith Busch" <kbusch@kernel.org>,
"Zeng, Oak" <oak.zeng@intel.com>,
"Chaitanya Kulkarni" <kch@nvidia.com>,
"Sagi Grimberg" <sagi@grimberg.me>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Logan Gunthorpe" <logang@deltatee.com>,
"Yishai Hadas" <yishaih@nvidia.com>,
"Shameer Kolothum" <shameerali.kolothum.thodi@huawei.com>,
"Kevin Tian" <kevin.tian@intel.com>,
"Alex Williamson" <alex.williamson@redhat.com>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org, iommu@lists.linux.dev,
linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org,
kvm@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API
Date: Fri, 12 Jul 2024 06:54:22 +0200 [thread overview]
Message-ID: <20240712045422.GA4774@lst.de> (raw)
In-Reply-To: <20240711232917.GR14050@ziepe.ca>
On Thu, Jul 11, 2024 at 08:29:17PM -0300, Jason Gunthorpe wrote:
> So this little detail needs to be taken care of somehow as well, and I
> didn't see it in this RFC.
Yes. Same about generally not mixing P2P and non-P2P.
>
> > For the block layer just having one kind per BIO is fine right now,
> > although I could see use cases where people would want to combine
> > them. We can probably defer that until it is needed, though.
>
> Do you have an application in mind that would want multi-kind per BIO?
If you are doing say garbage collection in a file system, and do write
that sources data from multiple devices, where some sit directly on the
root port and others behind a switch.
This is all purely hypothetical, and I'm happy to just check for it
and reject it for it now.
next prev parent reply other threads:[~2024-07-12 4:54 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-02 9:09 [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 01/18] dma-mapping: query DMA memory type Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 02/18] dma-mapping: provide an interface to allocate IOVA Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 03/18] dma-mapping: check if IOVA can be used Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 04/18] dma-mapping: implement link range API Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 05/18] mm/hmm: let users to tag specific PFN with DMA mapped bit Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 06/18] dma-mapping: provide callbacks to link/unlink HMM PFNs to specific IOVA Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 07/18] iommu/dma: Provide an interface to allow preallocate IOVA Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 08/18] iommu/dma: Implement link/unlink ranges callbacks Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 09/18] RDMA/umem: Preallocate and cache IOVA for UMEM ODP Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 10/18] RDMA/umem: Store ODP access mask information in PFN Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 11/18] RDMA/core: Separate DMA mapping to caching IOVA and page linkage Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 12/18] RDMA/umem: Prevent UMEM ODP creation with SWIOTLB Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 13/18] vfio/mlx5: Explicitly use number of pages instead of allocated length Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 14/18] vfio/mlx5: Rewrite create mkey flow to allow better code reuse Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 15/18] vfio/mlx5: Explicitly store page list Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 16/18] vfio/mlx5: Convert vfio to use DMA link API Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 17/18] block: export helper to get segment max size Leon Romanovsky
2024-07-02 9:09 ` [RFC PATCH v1 18/18] nvme-pci: use new dma API Leon Romanovsky
2024-07-04 15:23 ` Robin Murphy
2024-07-04 17:16 ` Leon Romanovsky
2024-07-05 5:58 ` Christoph Hellwig
2024-07-05 18:48 ` Leon Romanovsky
2024-07-06 6:08 ` Christoph Hellwig
2024-07-03 5:42 ` [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API Christoph Hellwig
2024-07-03 10:42 ` Zhu Yanjun
2024-07-03 10:52 ` Leon Romanovsky
2024-07-03 14:35 ` Christoph Hellwig
2024-07-03 15:51 ` Leon Romanovsky
2024-07-04 7:48 ` Christoph Hellwig
2024-07-04 13:18 ` Leon Romanovsky
2024-07-05 6:00 ` Christoph Hellwig
2024-07-08 16:52 ` Jason Gunthorpe
2024-07-09 6:17 ` Christoph Hellwig
2024-07-09 18:53 ` Jason Gunthorpe
2024-07-10 6:27 ` Christoph Hellwig
2024-07-11 23:21 ` Jason Gunthorpe
2024-07-05 22:53 ` Chaitanya Kulkarni
2024-07-06 6:26 ` Christoph Hellwig
2024-07-07 9:16 ` Leon Romanovsky
2024-07-07 12:45 ` Leon Romanovsky
2024-07-05 6:39 ` Christoph Hellwig
2024-07-07 9:45 ` Leon Romanovsky
2024-07-08 23:57 ` Jason Gunthorpe
2024-07-09 6:20 ` Christoph Hellwig
2024-07-09 19:03 ` Jason Gunthorpe
2024-07-10 6:22 ` Christoph Hellwig
2024-07-11 23:29 ` Jason Gunthorpe
2024-07-12 4:54 ` Christoph Hellwig [this message]
2024-07-12 12:42 ` Jason Gunthorpe
2024-07-13 5:24 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240712045422.GA4774@lst.de \
--to=hch@lst.de \
--cc=akpm@linux-foundation.org \
--cc=alex.williamson@redhat.com \
--cc=axboe@kernel.dk \
--cc=bhelgaas@google.com \
--cc=iommu@lists.linux.dev \
--cc=jgg@ziepe.ca \
--cc=jglisse@redhat.com \
--cc=joro@8bytes.org \
--cc=kbusch@kernel.org \
--cc=kch@nvidia.com \
--cc=kevin.tian@intel.com \
--cc=kvm@vger.kernel.org \
--cc=leon@kernel.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nvme@lists.infradead.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=logang@deltatee.com \
--cc=m.szyprowski@samsung.com \
--cc=oak.zeng@intel.com \
--cc=robin.murphy@arm.com \
--cc=sagi@grimberg.me \
--cc=shameerali.kolothum.thodi@huawei.com \
--cc=will@kernel.org \
--cc=yishaih@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.