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authorJiang Liu <jiang.liu@linux.intel.com>2014-11-06 22:20:17 +0800
committerThomas Gleixner <tglx@linutronix.de>2014-11-23 13:01:46 +0100
commit515085ef7ee74694bc9b02bc45196452defad59a (patch)
treee72aeb0216fcdcd1e91b26a4dacd118ee6b6a0c9 /kernel/irq
parent56e8abab615e0c5858cfb9fa0015a44641762b9d (diff)
downloadlinux-515085ef7ee74694bc9b02bc45196452defad59a.tar.bz2
genirq: Introduce irq_chip.irq_compose_msi_msg() to support stacked irqchip
Add callback irq_compose_msi_msg to struct irq_chip, which will be used to support stacked irqchip. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/chip.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 47f4c6469a43..63c16d165e78 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -926,3 +926,29 @@ int irq_chip_retrigger_hierarchy(struct irq_data *data)
return -ENOSYS;
}
#endif
+
+/**
+ * irq_chip_compose_msi_msg - Componse msi message for a irq chip
+ * @data: Pointer to interrupt specific data
+ * @msg: Pointer to the MSI message
+ *
+ * For hierarchical domains we find the first chip in the hierarchy
+ * which implements the irq_compose_msi_msg callback. For non
+ * hierarchical we use the top level chip.
+ */
+int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct irq_data *pos = NULL;
+
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+ for (; data; data = data->parent_data)
+#endif
+ if (data->chip && data->chip->irq_compose_msi_msg)
+ pos = data;
+ if (!pos)
+ return -ENOSYS;
+
+ pos->chip->irq_compose_msi_msg(pos, msg);
+
+ return 0;
+}