[xen staging] xen/riscv: introduce register_intc_ops() and intc_hw_ops

[patchbot@xxxxxxx]

commit 0aae2e3a91674da585b06555efa6eeff5937d0da
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Mon Jun 16 10:15:41 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 16 10:15:41 2025 +0200

    xen/riscv: introduce register_intc_ops() and intc_hw_ops
    
    Introduce the intc_hw_operations structure to encapsulate interrupt
    controller-specific data and operations. This structure includes:
    - A pointer to interrupt controller information (`intc_info`)
    - Callbacks to initialize the controller and set IRQ type/priority
    - A reference to an interupt controller descriptor (`host_irq_type`)
    - number of interrupt controller irqs.
    
    Add function register_intc_ops() to mentioned above structure.
    
    Co-developed-by: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/include/asm/intc.h | 19 +++++++++++++++++++
 xen/arch/riscv/intc.c             |  9 +++++++++
 2 files changed, 28 insertions(+)

diff --git a/xen/arch/riscv/include/asm/intc.h 
b/xen/arch/riscv/include/asm/intc.h
index 81f74736ba..434c9d0781 100644
--- a/xen/arch/riscv/include/asm/intc.h
+++ b/xen/arch/riscv/include/asm/intc.h
@@ -14,11 +14,30 @@ enum intc_version {
     INTC_APLIC,
 };
 
+struct irq_desc;
+
 struct intc_info {
     enum intc_version hw_version;
     const struct dt_device_node *node;
 };
 
+struct intc_hw_operations {
+    /* Hold intc hw information */
+    const struct intc_info *info;
+    /* Initialize the intc and the boot CPU */
+    int (*init)(void);
+
+    /* hw_irq_controller to enable/disable/eoi host irq */
+    const struct hw_interrupt_type *host_irq_type;
+
+    /* Set IRQ type */
+    void (*set_irq_type)(struct irq_desc *desc, unsigned int type);
+    /* Set IRQ priority */
+    void (*set_irq_priority)(struct irq_desc *desc, unsigned int priority);
+};
+
 void intc_preinit(void);
 
+void register_intc_ops(const struct intc_hw_operations *ops);
+
 #endif /* ASM__RISCV__INTERRUPT_CONTOLLER_H */
diff --git a/xen/arch/riscv/intc.c b/xen/arch/riscv/intc.c
index 4061a3c457..1ecd651bf3 100644
--- a/xen/arch/riscv/intc.c
+++ b/xen/arch/riscv/intc.c
@@ -5,6 +5,15 @@
 #include <xen/init.h>
 #include <xen/lib.h>
 
+#include <asm/intc.h>
+
+static const struct intc_hw_operations *__ro_after_init intc_hw_ops;
+
+void __init register_intc_ops(const struct intc_hw_operations *ops)
+{
+    intc_hw_ops = ops;
+}
+
 void __init intc_preinit(void)
 {
     if ( acpi_disabled )
--
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