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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
parent50019f09a4baa0bd6635d4933c1bfed22d66b640 (diff)
downloadop-kernel-dev-631a9639ac413da6242cb15558ebd661cf633622.zip
op-kernel-dev-631a9639ac413da6242cb15558ebd661cf633622.tar.gz
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>
-rw-r--r--include/linux/irqdomain.h35
-rw-r--r--kernel/irq/irqdomain.c14
2 files changed, 49 insertions, 0 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index ffb8460..bc2f571 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -183,6 +183,12 @@ enum {
/* Irq domain is an IPI domain with single virq */
IRQ_DOMAIN_FLAG_IPI_SINGLE = (1 << 3),
+ /* Irq domain implements MSIs */
+ IRQ_DOMAIN_FLAG_MSI = (1 << 4),
+
+ /* Irq domain implements MSI remapping */
+ IRQ_DOMAIN_FLAG_MSI_REMAP = (1 << 5),
+
/*
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
* for implementation specific purposes and ignored by the
@@ -446,6 +452,19 @@ static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE;
}
+
+static inline bool irq_domain_is_msi(struct irq_domain *domain)
+{
+ return domain->flags & IRQ_DOMAIN_FLAG_MSI;
+}
+
+static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
+{
+ return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP;
+}
+
+extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain);
+
#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
static inline void irq_domain_activate_irq(struct irq_data *data) { }
static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
@@ -477,6 +496,22 @@ static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
return false;
}
+
+static inline bool irq_domain_is_msi(struct irq_domain *domain)
+{
+ return false;
+}
+
+static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
+{
+ return false;
+}
+
+static inline bool
+irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
+{
+ return false;
+}
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
#else /* CONFIG_IRQ_DOMAIN */
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 8c0a0ae..876e131 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
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