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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
This commit is contained in:
Thomas Gleixner 2020-08-26 13:16:51 +02:00
parent 6b15ffa07d
commit c6c9e2838c
2 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/irqdomain.h
View File

@ -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,
};
/**

7
kernel/irq/msi.c
View File

@ -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;