irqdomain: Implement a method to automatically call parent domains alloc/free
Add a flags to irq_domain.flags to control whether the irqdomain core
should automatically call parent irqdomain's alloc/free callbacks. It
help to reduce hierarchy irqdomains users' code size.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Link: http://lkml.kernel.org/r/1416061447-9472-4-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 4e62832..9c88db7 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -960,6 +960,43 @@
irq_domain_free_irqs_common(domain, virq, nr_irqs);
}
+static bool irq_domain_is_auto_recursive(struct irq_domain *domain)
+{
+ return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
+}
+
+static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
+ unsigned int irq_base,
+ unsigned int nr_irqs)
+{
+ domain->ops->free(domain, irq_base, nr_irqs);
+ if (irq_domain_is_auto_recursive(domain)) {
+ BUG_ON(!domain->parent);
+ irq_domain_free_irqs_recursive(domain->parent, irq_base,
+ nr_irqs);
+ }
+}
+
+static int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
+ unsigned int irq_base,
+ unsigned int nr_irqs, void *arg)
+{
+ int ret = 0;
+ struct irq_domain *parent = domain->parent;
+ bool recursive = irq_domain_is_auto_recursive(domain);
+
+ BUG_ON(recursive && !parent);
+ if (recursive)
+ ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
+ nr_irqs, arg);
+ if (ret >= 0)
+ ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
+ if (ret < 0 && recursive)
+ irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
+
+ return ret;
+}
+
/**
* __irq_domain_alloc_irqs - Allocate IRQs from domain
* @domain: domain to allocate from
@@ -1016,7 +1053,7 @@
}
mutex_lock(&irq_domain_mutex);
- ret = domain->ops->alloc(domain, virq, nr_irqs, arg);
+ ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg);
if (ret < 0) {
mutex_unlock(&irq_domain_mutex);
goto out_free_irq_data;
@@ -1051,7 +1088,7 @@
mutex_lock(&irq_domain_mutex);
for (i = 0; i < nr_irqs; i++)
irq_domain_remove_irq(virq + i);
- data->domain->ops->free(data->domain, virq, nr_irqs);
+ irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs);
mutex_unlock(&irq_domain_mutex);
irq_domain_free_irq_data(virq, nr_irqs);
@@ -1059,6 +1096,47 @@
}
/**
+ * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
+ * @irq_base: Base IRQ number
+ * @nr_irqs: Number of IRQs to allocate
+ * @arg: Allocation data (arch/domain specific)
+ *
+ * Check whether the domain has been setup recursive. If not allocate
+ * through the parent domain.
+ */
+int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
+ unsigned int irq_base, unsigned int nr_irqs,
+ void *arg)
+{
+ /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
+ if (irq_domain_is_auto_recursive(domain))
+ return 0;
+
+ domain = domain->parent;
+ if (domain)
+ return irq_domain_alloc_irqs_recursive(domain, irq_base,
+ nr_irqs, arg);
+ return -ENOSYS;
+}
+
+/**
+ * irq_domain_free_irqs_parent - Free interrupts from parent domain
+ * @irq_base: Base IRQ number
+ * @nr_irqs: Number of IRQs to free
+ *
+ * Check whether the domain has been setup recursive. If not free
+ * through the parent domain.
+ */
+void irq_domain_free_irqs_parent(struct irq_domain *domain,
+ unsigned int irq_base, unsigned int nr_irqs)
+{
+ /* irq_domain_free_irqs_recursive() will call parent's free */
+ if (!irq_domain_is_auto_recursive(domain) && domain->parent)
+ irq_domain_free_irqs_recursive(domain->parent, irq_base,
+ nr_irqs);
+}
+
+/**
* irq_domain_activate_irq - Call domain_ops->activate recursively to activate
* interrupt
* @irq_data: outermost irq_data associated with interrupt