genirq: Add generic msi irq domain support

Implement the basic functions for MSI interrupt support with
hierarchical interrupt domains.

[ tglx: Extracted and combined from several patches ]

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>

1 files changed, 45 insertions, 0 deletions

diff --git a/include/linux/msi.h b/include/linux/msi.h
index e0d08517bd3d..b5ca2456769c 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -114,4 +114,49 @@ struct msi_controller {
         void (*teardown_irq)(struct msi_controller *chip, unsigned int irq);
 };
 
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+struct irq_domain;
+struct irq_chip;
+struct device_node;
+struct msi_domain_info;
+
+/**
+ * struct msi_domain_ops - MSI interrupt domain callbacks
+ * @get_hwirq:          Retrieve the resulting hw irq number
+ * @msi_init:           Domain specific init function for MSI interrupts
+ * @msi_free:           Domain specific function to free a MSI interrupts
+ */
+struct msi_domain_ops {
+        irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info, void *arg);
+        int             (*msi_init)(struct irq_domain *domain,
+                                    struct msi_domain_info *info,
+                                    unsigned int virq, irq_hw_number_t hwirq,
+                                    void *arg);
+        void            (*msi_free)(struct irq_domain *domain,
+                                    struct msi_domain_info *info,
+                                    unsigned int virq);
+};
+
+/**
+ * struct msi_domain_info - MSI interrupt domain data
+ * @ops:        The callback data structure
+ * @chip:       The associated interrupt chip
+ * @data:       Domain specific data
+ */
+struct msi_domain_info {
+        struct msi_domain_ops   *ops;
+        struct irq_chip         *chip;
+        void                    *data;
+};
+
+int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
+                            bool force);
+
+struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
+                                         struct msi_domain_info *info,
+                                         struct irq_domain *parent);
+struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
+
+#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
+
 #endif /* LINUX_MSI_H */