[PATCH v2 10/26] xen/riscv: implement make_intc_domU_node()

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Introduce a RISC-V specific function to create an interrupt controller
Device Tree node for DomU domains during dom0less build.

Add make_intc_domU_node() to the dom0less build path and wire it to
a new generic helper, intc_make_domu_dt_node(), which delegates DT
node creation to the active interrupt controller implementation via
vintc_init_ops.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in v2:
 - s/intc_make_domu_dt_node/make_intc_domU_node.
 - introduce separate intc_hw_init_ops structure for init operations.
 - Return -EOPNOTSUPP instead of -ENOSYS.
 - Drop const for kinfo argument as it could be changed by interrupt
   controller node creation code.
 - Refactor make_domu_dt_node().
 - Make make_domu_dt_node part of vintc structure as it looks more logical to be
   there.
---
 xen/arch/riscv/include/asm/domain.h |  2 ++
 xen/arch/riscv/include/asm/intc.h   | 12 ++++++++++--
 xen/arch/riscv/intc.c               | 11 +++++++++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/xen/arch/riscv/include/asm/domain.h 
b/xen/arch/riscv/include/asm/domain.h
index 664b0b9f9129..136d9e816a44 100644
--- a/xen/arch/riscv/include/asm/domain.h
+++ b/xen/arch/riscv/include/asm/domain.h
@@ -98,6 +98,8 @@ struct arch_domain {
 
     DECLARE_BITMAP(guest_isa, RISCV_ISA_EXT_MAX);
     char guest_isa_str[RISCV_GUEST_ISA_STR_MAX];
+
+    struct vintc *vintc;
 };
 
 #include <xen/sched.h>
diff --git a/xen/arch/riscv/include/asm/intc.h 
b/xen/arch/riscv/include/asm/intc.h
index 8b498e43b33f..70df461a2a51 100644
--- a/xen/arch/riscv/include/asm/intc.h
+++ b/xen/arch/riscv/include/asm/intc.h
@@ -8,14 +8,13 @@
 #ifndef ASM__RISCV__INTERRUPT_CONTOLLER_H
 #define ASM__RISCV__INTERRUPT_CONTOLLER_H
 
-struct dt_device_node;
-
 enum intc_version {
     INTC_APLIC,
 };
 
 struct cpu_user_regs;
 struct irq_desc;
+struct kernel_info;
 
 struct intc_info {
     enum intc_version hw_version;
@@ -46,6 +45,15 @@ struct intc_hw_init_ops {
     int (*init)(void);
 };
 
+struct vintc_init_ops {
+    /* Create interrupt controller node for domain */
+    int (*make_domu_dt_node)(struct kernel_info *kinfo);
+};
+
+struct vintc {
+    struct vintc_init_ops *init_ops;
+};
+
 void intc_preinit(void);
 
 void register_intc_ops(const struct intc_hw_operations *ops,
diff --git a/xen/arch/riscv/intc.c b/xen/arch/riscv/intc.c
index 8649160403f7..0994deddcb2c 100644
--- a/xen/arch/riscv/intc.c
+++ b/xen/arch/riscv/intc.c
@@ -3,6 +3,7 @@
 #include <xen/acpi.h>
 #include <xen/bug.h>
 #include <xen/device_tree.h>
+#include <xen/fdt-kernel.h>
 #include <xen/init.h>
 #include <xen/irq.h>
 #include <xen/lib.h>
@@ -73,3 +74,13 @@ void intc_route_irq_to_xen(struct irq_desc *desc, unsigned 
int priority)
     intc_set_irq_type(desc, desc->arch.type);
     intc_set_irq_priority(desc, priority);
 }
+
+int __init make_intc_domU_node(struct kernel_info *kinfo)
+{
+    struct vintc *vintc = kinfo->bd.d->arch.vintc;
+
+    if ( intc_hw_ops && vintc->init_ops && vintc->init_ops->make_domu_dt_node )
+        return vintc->init_ops->make_domu_dt_node(kinfo);
+
+    return -EOPNOTSUPP;
+}
-- 
2.54.0