[PATCH v5 0/4] pci: endpoint: vntb: add MSI doorbell support

Frank Li
2025-10-09T20:54:57Z

Since commit 1c3b002c6bf68 PCI: endpoint: Add RC-to-EP doorbell support
using platform MSI controller, PCI EP can get notification from Host.

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 <Frank.Li@nxp.com>
---
Changes in v5:
- update atu field aligned_size to mem_size.
- Link to v4: https://lore.kernel.org/r/20250930-vntb_msi_doorbell-v4-0-ea2c94c6ff2e@nxp.com

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 (4):
PCI: endpoint: Rename aligned_size to mem_size
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 | 163 +++++++++++++++++++++-----
include/linux/pci-epf.h | 12 +-
3 files changed, 275 insertions(+), 52 deletions(-)
---
base-commit: c2a282d1fccc53a989da61a5da4f03c9d67ee99a
change-id: 20250812-vntb_msi_doorbell-bf0fbac6d6d7

Best regards,
--
Frank Li <Frank.Li@nxp.com>