From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 26 Aug 2020 13:16:51 +0200
Subject: irqdomain/msi: Provide DOMAIN_BUS_VMD_MSI
Git-commit: c6c9e2838c5f0b94773511586123bcb125757f2a
Patch-mainline: v5.10-rc1
References: jsc#SLE-16823
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
Acked-by: Joerg Roedel <jroedel@suse.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
@@ -83,6 +83,7 @@ enum irq_domain_bus_token {
DOMAIN_BUS_IPI,
DOMAIN_BUS_FSL_MC_MSI,
DOMAIN_BUS_TI_SCI_INTA_MSI,
+ DOMAIN_BUS_VMD_MSI,
};
/**
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -364,8 +364,13 @@ 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;