On Wed, 26 Aug 2020 12:16:51 +0100,
Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>
>
> ---
> 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;
Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
M.
--
Without deviation from the norm, progress is not possible.
