From c6c9e2838c5f0b94773511586123bcb125757f2a Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 26 Aug 2020 13:16:51 +0200 Subject: [PATCH] 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 Acked-by: Marc Zyngier Acked-by: Jon Derrick Link: https://lore.kernel.org/r/20200826112332.954409970@linutronix.de --- include/linux/irqdomain.h | 1 + kernel/irq/msi.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index b37350c4fe37..44445d9de881 100644 --- 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, }; /** diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 640668e3f870..616b9583cfbb 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -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;