Re: [RFC PATCH v4 15/38] PCI: endpoint: pci-epf-vntb: Implement .get_dma_dev()
From: Frank Li <Frank.li@nxp.com>
Date: 2026-01-19 20:30:34
Also in:
dmaengine, linux-devicetree, linux-doc, linux-iommu, linux-kselftest, linux-pci, linux-renesas-soc, lkml
On Sun, Jan 18, 2026 at 10:54:17PM +0900, Koichiro Den wrote:
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.
Simple said: Implement .get_dma_dev() and return the EPC parent device for NTB core/client's DMA allocations and mappings API. Reviewed-by: Frank Li <Frank.Li@nxp.com>
quoted hunk ↗ jump to hunk
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, }; --2.51.0