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authorEric Auger <eric.auger@redhat.com>2017-01-19 20:57:57 +0000
committerWill Deacon <will.deacon@arm.com>2017-01-23 15:00:44 +0000
commit631a9639ac413da6242cb15558ebd661cf633622 (patch)
tree02bd936b0fae2a4b8410550de6ed63bb1aff8ac8 /kernel/irq/irqdomain.c
parent50019f09a4baa0bd6635d4933c1bfed22d66b640 (diff)
downloadlinux-631a9639ac413da6242cb15558ebd661cf633622.tar.bz2
irqdomain: Add irq domain MSI and MSI_REMAP flags
We introduce two new enum values for the irq domain flag: - IRQ_DOMAIN_FLAG_MSI indicates the irq domain corresponds to an MSI domain - IRQ_DOMAIN_FLAG_MSI_REMAP indicates the irq domain has MSI remapping capabilities. Those values will be useful to check all MSI irq domains have MSI remapping support when assessing the safety of IRQ assignment to a guest. irq_domain_hierarchical_is_msi_remap() allows to check if an irq domain or any parent implements MSI remapping. Signed-off-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com> Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com> Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'kernel/irq/irqdomain.c')
-rw-r--r--kernel/irq/irqdomain.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 8c0a0ae43521..876e13172dc8 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1392,6 +1392,20 @@ static void irq_domain_check_hierarchy(struct irq_domain *domain)
if (domain->ops->alloc)
domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
}
+
+/**
+ * irq_domain_hierarchical_is_msi_remap - Check if the domain or any
+ * parent has MSI remapping support
+ * @domain: domain pointer
+ */
+bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
+{
+ for (; domain; domain = domain->parent) {
+ if (irq_domain_is_msi_remap(domain))
+ return true;
+ }
+ return false;
+}
#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
/**
* irq_domain_get_irq_data - Get irq_data associated with @virq and @domain