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    Subject[patch V2 23/46] irqdomain/msi: Provide DOMAIN_BUS_VMD_MSI
    From: Thomas Gleixner <tglx@linutronix.de>

    PCI devices behind a VMD bus are not subject to interrupt remapping, but
    the irq domain for VMD MSI cannot be distinguished from a regular PCI/MSI
    irq domain.

    Add a new domain bus token and allow it in the bus token check in
    msi_check_reservation_mode() to keep the functionality the same once VMD
    uses this token.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

    ---
    include/linux/irqdomain.h | 1 +
    kernel/irq/msi.c | 7 ++++++-
    2 files changed, 7 insertions(+), 1 deletion(-)

    --- a/include/linux/irqdomain.h
    +++ b/include/linux/irqdomain.h
    @@ -84,6 +84,7 @@ enum irq_domain_bus_token {
    DOMAIN_BUS_FSL_MC_MSI,
    DOMAIN_BUS_TI_SCI_INTA_MSI,
    DOMAIN_BUS_WAKEUP,
    + DOMAIN_BUS_VMD_MSI,
    };

    /**
    --- a/kernel/irq/msi.c
    +++ b/kernel/irq/msi.c
    @@ -370,8 +370,13 @@ static bool msi_check_reservation_mode(s
    {
    struct msi_desc *desc;

    - if (domain->bus_token != DOMAIN_BUS_PCI_MSI)
    + switch(domain->bus_token) {
    + case DOMAIN_BUS_PCI_MSI:
    + case DOMAIN_BUS_VMD_MSI:
    + break;
    + default:
    return false;
    + }

    if (!(info->flags & MSI_FLAG_MUST_REACTIVATE))
    return false;

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