Re: [PATCH v13 3/5] dma-buf: add optional get_pci_tph() callback
| Newsgroups | gmane.linux.kernel.pci,gmane.comp.video.dri.devel,gmane.comp.emulators.kvm.devel |
|---|---|
| Message-ID | <[email protected]> |
> 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 <[email protected]> Sashiko has reviewed this patch and found no issues. It looks great! -- Sashiko AI review · https://sashiko.dev/#/patchset/[email protected]?part=3