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VNTB use this feature to reduce ping latency. The first patch impove epf core API to allow set any MMIO address to specfic bar. The second patch add MSI doorbell support. Signed-off-by: Frank Li --- Changes in v4: - use 'bar_size' instead of aligned_bar_size - Link to v3: https://lore.kernel.org/r/20250925-vntb_msi_doorbell-v3-0-ae0b0c93caae@nxp.com Changes in v3: - update function name to pci_epf_assign_bar_space() - detail check each patch's change log - Link to v2: https://lore.kernel.org/r/20250915-vntb_msi_doorbell-v2-0-ca71605e3444@nxp.com Changes in v2: - add help funciton to get bar's inbounce size - fix miss x8 when caculate bits - Link to v1: https://lore.kernel.org/r/20250815-vntb_msi_doorbell-v1-0-32df6c4bf96c@nxp.com --- Frank Li (3): PCI: endpoint: Add helper function pci_epf_get_bar_required_size() PCI: endpoint: Add API pci_epf_assign_bar_space() PCI: endpoint: pci-epf-vntb: Add MSI doorbell support drivers/pci/endpoint/functions/pci-epf-vntb.c | 152 +++++++++++++++++++++--- drivers/pci/endpoint/pci-epf-core.c | 161 +++++++++++++++++++++----- include/linux/pci-epf.h | 6 + 3 files changed, 272 insertions(+), 47 deletions(-) --- base-commit: c2a282d1fccc53a989da61a5da4f03c9d67ee99a change-id: 20250812-vntb_msi_doorbell-bf0fbac6d6d7 Best regards, -- Frank Li