From: Leon Romanovsky <leon@kernel.org>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: "Bjorn Helgaas" <bhelgaas@google.com>,
"Logan Gunthorpe" <logang@deltatee.com>,
"Jens Axboe" <axboe@kernel.dk>,
"Robin Murphy" <robin.murphy@arm.com>,
"Joerg Roedel" <joro@8bytes.org>, "Will Deacon" <will@kernel.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Kees Cook" <kees@kernel.org>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
"Ankit Agrawal" <ankita@nvidia.com>,
"Yishai Hadas" <yishaih@nvidia.com>,
"Shameer Kolothum" <skolothumtho@nvidia.com>,
"Kevin Tian" <kevin.tian@intel.com>,
"Alex Williamson" <alex@shazbot.org>,
"Krishnakant Jaju" <kjaju@nvidia.com>,
"Matt Ochs" <mochs@nvidia.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-block@vger.kernel.org, iommu@lists.linux.dev,
linux-mm@kvack.org, linux-doc@vger.kernel.org,
linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, kvm@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v7 05/11] PCI/P2PDMA: Document DMABUF model
Date: Fri, 7 Nov 2025 22:27:18 +0200 [thread overview]
Message-ID: <20251107202718.GE15456@unreal> (raw)
In-Reply-To: <0c265a9b-fdc5-40d7-845f-30910f1ac6ea@infradead.org>
On Fri, Nov 07, 2025 at 10:58:27AM -0800, Randy Dunlap wrote:
>
>
> On 11/7/25 8:01 AM, Leon Romanovsky wrote:
> > On Thu, Nov 06, 2025 at 10:15:07PM -0800, Randy Dunlap wrote:
> >>
> >>
> >> On 11/6/25 6:16 AM, Leon Romanovsky wrote:
> >>> From: Jason Gunthorpe <jgg@nvidia.com>
> >>>
> >>> Reflect latest changes in p2p implementation to support DMABUF lifecycle.
> >>>
> >>> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
> >>> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> >>> ---
> >>> Documentation/driver-api/pci/p2pdma.rst | 95 +++++++++++++++++++++++++--------
> >>> 1 file changed, 72 insertions(+), 23 deletions(-)
<...>
> >>> -The second issue is that to make use of existing interfaces in Linux,
> >>> -memory that is used for P2P transactions needs to be backed by struct
> >>> -pages. However, PCI BARs are not typically cache coherent so there are
> >>> -a few corner case gotchas with these pages so developers need to
> >>> -be careful about what they do with them.
> >>> +For PCIe the routing of TLPs is well defined up until they reach a host bridge
> >>
> >> Define what TLP means?
> >
> > In PCIe "world", TLP is very well-known and well-defined acronym, which
> > means Transaction Layer Packet.
>
> It's your choice (or Bjorn's). I'm just reviewing...
Thanks a lot.
next prev parent reply other threads:[~2025-11-07 20:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-06 14:16 [PATCH v7 00/11] vfio/pci: Allow MMIO regions to be exported through dma-buf Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 01/11] PCI/P2PDMA: Separate the mmap() support from the core logic Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 02/11] PCI/P2PDMA: Simplify bus address mapping API Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 03/11] PCI/P2PDMA: Refactor to separate core P2P functionality from memory allocation Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 04/11] PCI/P2PDMA: Provide an access to pci_p2pdma_map_type() function Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 05/11] PCI/P2PDMA: Document DMABUF model Leon Romanovsky
2025-11-07 6:15 ` Randy Dunlap
2025-11-07 16:01 ` Leon Romanovsky
2025-11-07 18:58 ` Randy Dunlap
2025-11-07 20:27 ` Leon Romanovsky [this message]
2025-11-06 14:16 ` [PATCH v7 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 07/11] vfio: Export vfio device get and put registration helpers Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 08/11] vfio/pci: Share the core device pointer while invoking feature functions Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 09/11] vfio/pci: Enable peer-to-peer DMA transactions by default Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 10/11] vfio/pci: Add dma-buf export support for MMIO regions Leon Romanovsky
2025-11-06 14:16 ` [PATCH v7 11/11] vfio/nvgrace: Support get_dmabuf_phys Leon Romanovsky
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