On Wed, Nov 06, 2024 at 10:15:27AM +0100, Niklas Cassel wrote: > > I do get a domain, but I do not get any IRQ on the EP side when the RC side is > writing the doorbell (as part of pcitest -B), > > [ 7.978984] pci_epc_alloc_doorbell: num_db: 1 > [ 7.979545] pci_epf_test_bind: doorbell_addr: 0x40 > [ 7.979978] pci_epf_test_bind: doorbell_data: 0x0 > [ 7.980397] pci_epf_test_bind: doorbell_bar: 0x1 > [ 21.114613] pci_epf_enable_doorbell db_bar: 1 > [ 21.115001] pci_epf_enable_doorbell: doorbell_addr: 0xfe650040 > [ 21.115512] pci_epf_enable_doorbell: phys_addr: 0xfe650000 > [ 21.115994] pci_epf_enable_doorbell: success > > # cat /proc/interrupts | grep epc > 117: 0 0 0 0 0 0 0 0 ITS-pMSI-a40000000.pcie-ep 0 Edge pci-epc-doorbell0 > > Even if I try to write the doorbell manually from EP side using devmem: > > # devmem 0xfe670040 32 1 Sorry, this should of course have been: # devmem 0xfe650040 32 1 But the result is the name, no IRQ triggered on the EP side. (My command above was from testing "msi-parent = <&its0 0x0000>", rather than &its1, but that also didn't work when writing the corresponding "doorbell_addr" using e.g. devmem.) Considering that the RC node is using &its1, that is probably also what should be used in the EP node when running the controller in EP mode instead of RC mode. Kind regards, Niklas
