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 <[email protected]> Reviewed-by: Niklas Cassel <[email protected]> Reviewed-by: Frank Li <[email protected]> Signed-off-by: Koichiro Den <[email protected]> --- 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; -- 2.51.0
