Commit c6c9e283 authored Aug 26, 2020 by Thomas Gleixner

irqdomain/msi: Provide DOMAIN_BUS_VMD_MSI



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>
Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Jon Derrick <jonathan.derrick@intel.com>
Link: https://lore.kernel.org/r/20200826112332.954409970@linutronix.de

parent 6b15ffa0

include/linux/irqdomain.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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,
		};

		/**

kernel/irq/msi.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -364,8 +364,13 @@ static bool msi_check_reservation_mode(struct irq_domain *domain,
		{
		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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