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Write BAR│ │ │◄──┼───────────────────────────────────┼───┤ │ │ │ │ │ │ │ │ ├──►│ 4.Irq Handle │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ └────────────┘ └───────────────────────────────────┘ └────────────────┘ This patches based on old https://lore.kernel.org/imx/20221124055036.1630573-1-Frank.Li@nxp.com/ Original patch only target to vntb driver. But actually it is common method. This patches add new API to pci-epf-core, so any EP driver can use it. Previous v2 discussion here. https://lore.kernel.org/imx/20230911220920.1817033-1-Frank.Li@nxp.com/ Changes in v6: - change doorbell_addr to doorbell_offset - use round_down() - add Niklas's test by tag - rebase to pci/endpoint - Link to v5: https://lore.kernel.org/r/20241108-ep-msi-v5-0-a14951c0d007@nxp.com Changes in v5: - Move request_irq to epf test function driver for more flexiable user case - Add fixed size bar handler - Some minor improvememtn to see each patches's changelog. - Link to v4: https://lore.kernel.org/r/20241031-ep-msi-v4-0-717da2d99b28@nxp.com Changes in v4: - Remove patch genirq/msi: Add cleanup guard define for msi_lock_descs()/msi_unlock_descs() - Use new method to avoid compatible problem. Add new command DOORBELL_ENABLE and DOORBELL_DISABLE. pcitest -B send DOORBELL_ENABLE first, EP test function driver try to remap one of BAR_N (except test register bar) to ITS MSI MMIO space. Old driver don't support new command, so failure return, not side effect. After test, DOORBELL_DISABLE command send out to recover original map, so pcitest bar test can pass as normal. - Other detail change see each patches's change log - Link to v3: https://lore.kernel.org/r/20241015-ep-msi-v3-0-cedc89a16c1a@nxp.com Change from v2 to v3 - Fixed manivannan's comments - Move common part to pci-ep-msi.c and pci-ep-msi.h - rebase to 6.12-rc1 - use RevID to distingiush old version mkdir /sys/kernel/config/pci_ep/functions/pci_epf_test/func1 echo 16 > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/msi_interrupts echo 0x080c > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/deviceid echo 0x1957 > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/vendorid echo 1 > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/revid ^^^^^^ to enable platform msi support. ln -s /sys/kernel/config/pci_ep/functions/pci_epf_test/func1 /sys/kernel/config/pci_ep/controllers/4c380000.pcie-ep - use new device ID, which identify support doorbell to avoid broken compatility. Enable doorbell support only for PCI_DEVICE_ID_IMX8_DB, while other devices keep the same behavior as before. EP side RC with old driver RC with new driver PCI_DEVICE_ID_IMX8_DB no probe doorbell enabled Other device ID doorbell disabled* doorbell disabled* * Behavior remains unchanged. Change from v1 to v2 - Add missed patch for endpont/pci-epf-test.c - Move alloc and free to epc driver from epf. - Provide general help function for EPC driver to alloc platform msi irq. - Fixed manivannan's comments. To: Manivannan Sadhasivam To: Krzysztof Wilczyński To: Kishon Vijay Abraham I To: Bjorn Helgaas To: Arnd Bergmann To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: imx@lists.linux.dev Cc: Niklas Cassel Cc: cassel@kernel.org Cc: dlemoal@kernel.org Cc: maz@kernel.org Cc: tglx@linutronix.de Cc: jdmason@kudzu.us Signed-off-by: Frank Li --- Frank Li (5): PCI: endpoint: Add pci_epc_get_fn() API for customizable filtering PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller PCI: endpoint: pci-epf-test: Add doorbell test support misc: pci_endpoint_test: Add doorbell test case tools: PCI: Add 'B' option for test doorbell drivers/misc/pci_endpoint_test.c | 71 ++++++++++++++ drivers/pci/endpoint/Makefile | 2 +- drivers/pci/endpoint/functions/pci-epf-test.c | 129 ++++++++++++++++++++++++++ drivers/pci/endpoint/pci-ep-msi.c | 99 ++++++++++++++++++++ drivers/pci/endpoint/pci-epc-core.c | 23 ++++- include/linux/pci-ep-msi.h | 15 +++ include/linux/pci-epc.h | 2 + include/linux/pci-epf.h | 16 ++++ include/uapi/linux/pcitest.h | 1 + tools/pci/pcitest.c | 16 +++- 10 files changed, 370 insertions(+), 4 deletions(-) --- base-commit: f5373677e13177cfc7875f44a864f9a1db751df9 change-id: 20241010-ep-msi-8b4cab33b1be Best regards, --- Frank Li