[RFC PATCH v4 15/38] PCI: endpoint: pci-epf-vntb: Implement .get_dma_dev()
From: Koichiro Den <hidden>
Date: 2026-01-18 13:55:25
Also in:
dmaengine, linux-devicetree, linux-doc, linux-iommu, linux-kselftest, linux-pci, linux-renesas-soc, lkml
Subsystem:
ntb driver core, pci endpoint subsystem, pci subsystem, the rest · Maintainers:
Jon Mason, Dave Jiang, Allen Hubbe, Manivannan Sadhasivam, Krzysztof Wilczyński, Bjorn Helgaas, Linus Torvalds
For DMA API allocations and mappings, pci-epf-vntb should provide an appropriate struct device for the NTB core/clients. Implement .get_dma_dev() and return the EPC parent device. Signed-off-by: Koichiro Den <redacted> --- drivers/pci/endpoint/functions/pci-epf-vntb.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 9fbc27000f77..7cd976757d15 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c@@ -1747,6 +1747,15 @@ 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); + + if (!ntb || !ntb->epf) + return NULL; + return ntb->epf->epc->dev.parent; +} + static void *vntb_epf_get_private_data(struct ntb_dev *ndev) { struct epf_ntb *ntb = ntb_ndev(ndev);
@@ -1780,6 +1789,7 @@ 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, .get_private_data = vntb_epf_get_private_data, };
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2.51.0