On Tue, Feb 10, 2026 at 01:24:29PM +0100, Niklas Cassel wrote: > On Mon, Feb 09, 2026 at 09:53:08PM +0900, Koichiro Den wrote: > > Tested on > > ========= > > > > I tested the embedded (DMA) doorbell fallback path (via pci-epf-test) on > > R-Car Spider boards: > > > > $ ./pci_endpoint_test -t DOORBELL_TEST > > TAP version 13 > > 1..1 > > # Starting 1 tests from 1 test cases. > > # RUN pcie_ep_doorbell.DOORBELL_TEST ... > > # OK pcie_ep_doorbell.DOORBELL_TEST > > ok 1 pcie_ep_doorbell.DOORBELL_TEST > > # PASSED: 1 / 1 tests passed. > > # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 > > > > with the following message observed on the EP side: > > > > [ 80.464653] pci_epf_test pci_epf_test.0: Using embedded (DMA) doorbell > > fallback > > > > (Note: for the test to pass on R-Car Spider, one of the following was > > required: > > - echo 1048576 > functions/pci_epf_test/func1/pci_epf_test.0/bar2_size > > - apply > > https://lore.kernel.org/all/[email protected]/) > > I applied this series on top of branch pci/controller/dwc > on Rock 5B (pcie-dw-rockchip.c). > > On EP side: > [ 39.218533] pci_epf_test pci_epf_test.0: Can't find MSI domain for EPC > [ 39.219125] pci_epf_test pci_epf_test.0: Using embedded (DMA) doorbell > fallback > > On RC side: > # RUN pcie_ep_doorbell.DOORBELL_TEST ... > [ 40.297892] pci-endpoint-test 0000:01:00.0: Failed to trigger doorbell in > endpoint > # pci_endpoint_test.c:279:DOORBELL_TEST:Expected 0 (0) == ret (-22) > # pci_endpoint_test.c:279:DOORBELL_TEST:Test failed for Doorbell > > # DOORBELL_TEST: Test failed > # FAIL pcie_ep_doorbell.DOORBELL_TEST > not ok 23 pcie_ep_doorbell.DOORBELL_TEST > > Any suggestions? > > (All BARs in pcie-dw-rockchip.c is marked as BAR_RESIZABLE.)
Thank you for testing. If the failure was observed in a scenario other than a plain `./pci_endpoint_test -t DOORBELL_TEST`, could you please try again with [1] applied as well? [1] https://lore.kernel.org/linux-pci/[email protected]/ Best regards, Koichiro > > > Kind regards, > Niklas >
