On Thu, Oct 26, 2023 at 01:53:36AM +0530, Sunil V L wrote: > The RINTC subtype structure in MADT also has information about other > interrupt controllers like MMIO. So, save those information and provide > interfaces to retrieve them when required by corresponding drivers. > @@ -218,7 +306,19 @@ static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header, > + * MSI controller (IMSIC) in RISC-V is optional. So, unless > + * IMSIC is discovered, set system wide MSI support as > + * unsupported. Once IMSIC is probed, MSI support will be set. > + */ > + pci_no_msi(); It doesn't seem like we should have to tell the PCI core about functionality we *don't* have. I would think IMSIC would be detected before enumerating PCI devices that might use it, and if we *haven't* found an IMSIC by the time we get to pci_register_host_bridge(), would/should we set PCI_BUS_FLAGS_NO_MSI there? I see Thomas is cc'd; he'd have better insight. Bjorn
