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PCI: endpoint: pci-epf-vntb: Implement .get_dma_dev()

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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 <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260306031443.1911860-4-den@valinux.co.jp
This commit is contained in:
Koichiro Den
2026-03-06 12:14:43 +09:00
committed by Bjorn Helgaas
parent 852b94ff92
commit 70becc1a9b
1 changed files with 9 additions and 0 deletions
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9
drivers/pci/endpoint/functions/pci-epf-vntb.c
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@@ -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)