From: sashiko-bot@kernel.org
To: "Zhiping Zhang" <zhipingz@meta.com>
Cc: dri-devel@lists.freedesktop.org, linux-pci@vger.kernel.org,
kvm@vger.kernel.org
Subject: Re: [PATCH v13 3/5] dma-buf: add optional get_pci_tph() callback
Date: Fri, 31 Jul 2026 21:37:53 +0000 [thread overview]
Message-ID: <20260731213753.A0CAC1F00AC4@smtp.kernel.org> (raw)
In-Reply-To: <20260731211601.3033906-4-zhipingz@meta.com>
> Add an optional dma_buf_ops.get_pci_tph callback and a
> DMA-buf importer wrapper, dma_buf_get_pci_tph().
>
> TPH is PCIe TLP Processing Hint. 8-bit ST and 16-bit Extended ST are
> distinct PCIe TPH namespaces, so the importer requests the namespace it
> can emit and the exporter returns the matching ST/PH tuple or
> -EOPNOTSUPP.
>
> dma_buf_get_pci_tph() is the importer entry point. It requires
> &dmabuf->resv to be held while the callback runs and returns
> -EOPNOTSUPP when the exporter does not provide PCI TPH metadata.
>
> The first user is VFIO_DEVICE_FEATURE_DMA_BUF_TPH in vfio-pci, with
> mlx5 as the first importer.
>
> Signed-off-by: Zhiping Zhang <zhipingz@meta.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260731211601.3033906-1-zhipingz@meta.com?part=3
next prev parent reply other threads:[~2026-07-31 21:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-31 21:15 [PATCH v13 0/5] vfio/dma-buf: add TPH support for peer-to-peer access Zhiping Zhang
2026-07-31 21:15 ` [PATCH v13 1/5] PCI/TPH: treat reserved 0b10 completer encoding as unsupported Zhiping Zhang
2026-07-31 21:38 ` sashiko-bot
2026-07-31 21:15 ` [PATCH v13 2/5] PCI/TPH: Add requester/completer type helpers Zhiping Zhang
2026-07-31 21:40 ` sashiko-bot
2026-07-31 21:15 ` [PATCH v13 3/5] dma-buf: add optional get_pci_tph() callback Zhiping Zhang
2026-07-31 21:37 ` sashiko-bot [this message]
2026-07-31 21:15 ` [PATCH v13 4/5] vfio/pci: implement get_pci_tph and DMA_BUF_TPH feature Zhiping Zhang
2026-07-31 21:38 ` sashiko-bot
2026-07-31 21:15 ` [PATCH v13 5/5] RDMA/mlx5: get tph for p2p access when registering dma-buf mr Zhiping Zhang
2026-07-31 21:48 ` sashiko-bot
2026-07-31 22:59 ` Zhiping Zhang
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