From: Koichiro Den Date: Fri, 6 Mar 2026 03:14:43 +0000 (+0900) Subject: PCI: endpoint: pci-epf-vntb: Implement .get_dma_dev() X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70becc1a9b453ce04f97507585afc2cf47e67b11;p=thirdparty%2Fkernel%2Flinux.git PCI: endpoint: pci-epf-vntb: Implement .get_dma_dev() When vNTB is used as a PCI endpoint function, the NTB device is backed by a virtual PCI function. For DMA API allocations and mappings, NTB clients must use the device that is associated with the IOMMU domain. Implement ntb_dev_ops->get_dma_dev() for pci-epf-vntb and return the EPC parent device. Suggested-by: Frank Li Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Reviewed-by: Dave Jiang Link: https://patch.msgid.link/20260306031443.1911860-4-den@valinux.co.jp --- diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c index 8053535289673..2256c3062b1ae 100644 --- a/drivers/pci/endpoint/functions/pci-epf-vntb.c +++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c @@ -1428,6 +1428,14 @@ static int vntb_epf_link_disable(struct ntb_dev *ntb) return 0; } +static struct device *vntb_epf_get_dma_dev(struct ntb_dev *ndev) +{ + struct epf_ntb *ntb = ntb_ndev(ndev); + struct pci_epc *epc = ntb->epf->epc; + + return epc->dev.parent; +} + static const struct ntb_dev_ops vntb_epf_ops = { .mw_count = vntb_epf_mw_count, .spad_count = vntb_epf_spad_count, @@ -1449,6 +1457,7 @@ static const struct ntb_dev_ops vntb_epf_ops = { .db_clear_mask = vntb_epf_db_clear_mask, .db_clear = vntb_epf_db_clear, .link_disable = vntb_epf_link_disable, + .get_dma_dev = vntb_epf_get_dma_dev, }; static int pci_vntb_probe(struct pci_dev *pdev, const struct pci_device_id *id)