Commit 06a81c59 authored by Koichiro Den's avatar Koichiro Den Committed by Manivannan Sadhasivam
Browse files

PCI: endpoint: Add dynamic_inbound_mapping EPC feature 



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: default avatarNiklas Cassel <cassel@kernel.org>
Signed-off-by: default avatarKoichiro Den <den@valinux.co.jp>
Signed-off-by: default avatarManivannan Sadhasivam <mani@kernel.org>
Reviewed-by: default avatarNiklas Cassel <cassel@kernel.org>
Reviewed-by: default avatarFrank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260124145012.2794108-2-den@valinux.co.jp
parent 0ecd890e

include/linux/pci-epc.h

+5 −0
Original line number Diff line number Diff line
@@ -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;