[PATCH v8 1/5] PCI: endpoint: Add dynamic_inbound_mapping EPC feature
From: Koichiro Den <hidden>
Date: 2026-01-15 08:50:00
Also in:
imx, linux-arm-msm, linux-omap, linux-pci, linux-renesas-soc, linux-rockchip, linux-tegra, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
Introduce a new EPC feature bit (dynamic_inbound_mapping) that indicates whether an Endpoint Controller can update the inbound address translation for a BAR without requiring the EPF driver to clear/reset the BAR first. Endpoint Function drivers (e.g. vNTB) can use this information to decide whether it really is safe to call pci_epc_set_bar() multiple times to update inbound mappings for the BAR. Suggested-by: Niklas Cassel <cassel@kernel.org> Reviewed-by: Niklas Cassel <cassel@kernel.org> Reviewed-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Koichiro Den <redacted> --- include/linux/pci-epc.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 4286bfdbfdfa..4c8516756c56 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h@@ -223,6 +223,10 @@ struct pci_epc_bar_desc { /** * struct pci_epc_features - features supported by a EPC device per function * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up + * @dynamic_inbound_mapping: indicate if the EPC device supports updating + * inbound mappings for an already configured BAR + * (i.e. allow calling pci_epc_set_bar() again + * without first calling pci_epc_clear_bar()) * @msi_capable: indicate if the endpoint function has MSI capability * @msix_capable: indicate if the endpoint function has MSI-X capability * @intx_capable: indicate if the endpoint can raise INTx interrupts
@@ -231,6 +235,7 @@ struct pci_epc_bar_desc { */ struct pci_epc_features { unsigned int linkup_notifier : 1; + unsigned int dynamic_inbound_mapping : 1; unsigned int msi_capable : 1; unsigned int msix_capable : 1; unsigned int intx_capable : 1;
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2.51.0