kvmtool: ARM: allow level interrupts in device tree

Currently we describe every interrupt for each device in the FDT
as being edge triggered.
Add a parameter to the irq property generation to allow devices to
specify their interrupts as level triggered if needed.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

arm/fdt.c

@@ -74,12 +74,12 @@ static void generate_cpu_nodes(void *fdt, struct kvm *kvm)
 	_FDT(fdt_end_node(fdt));
 }
 
-static void generate_irq_prop(void *fdt, u8 irq)
+static void generate_irq_prop(void *fdt, u8 irq, enum irq_type irq_type)
 {
 	u32 irq_prop[] = {
 		cpu_to_fdt32(GIC_FDT_IRQ_TYPE_SPI),
 		cpu_to_fdt32(irq - GIC_SPI_IRQ_BASE),
-		cpu_to_fdt32(IRQ_TYPE_EDGE_RISING),
+		cpu_to_fdt32(irq_type)
 	};
 
 	_FDT(fdt_property(fdt, "interrupts", irq_prop, sizeof(irq_prop)));
@@ -127,7 +127,7 @@ static int setup_fdt(struct kvm *kvm)
 	void *fdt_dest		= guest_flat_to_host(kvm,
 						     kvm->arch.dtb_guest_start);
 	void (*generate_mmio_fdt_nodes)(void *, struct device_header *,
-					void (*)(void *, u8));
+					void (*)(void *, u8, enum irq_type));
 	void (*generate_cpu_peripheral_fdt_nodes)(void *, struct kvm *, u32)
 					= kvm->cpus[0]->generate_fdt_nodes;
 

hw/serial.c

@@ -367,9 +367,11 @@ static bool serial8250_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port,
 
 #ifdef CONFIG_HAS_LIBFDT
 #define DEVICE_NAME_MAX_LEN 32
-static void serial8250_generate_fdt_node(struct ioport *ioport, void *fdt,
-					 void (*generate_irq_prop)(void *fdt,
-								   u8 irq))
+static
+void serial8250_generate_fdt_node(struct ioport *ioport, void *fdt,
+				  void (*generate_irq_prop)(void *fdt,
+							    u8 irq,
+							    enum irq_type))
 {
 	char dev_name[DEVICE_NAME_MAX_LEN];
 	struct serial8250_device *dev = ioport->priv;
@@ -384,7 +386,7 @@ static void serial8250_generate_fdt_node(struct ioport *ioport, void *fdt,
 	_FDT(fdt_begin_node(fdt, dev_name));
 	_FDT(fdt_property_string(fdt, "compatible", "ns16550a"));
 	_FDT(fdt_property(fdt, "reg", reg_prop, sizeof(reg_prop)));
-	generate_irq_prop(fdt, dev->irq);
+	generate_irq_prop(fdt, dev->irq, IRQ_TYPE_EDGE_RISING);
 	_FDT(fdt_property_cell(fdt, "clock-frequency", 1843200));
 	_FDT(fdt_end_node(fdt));
 }

include/kvm/ioport.h

@@ -4,6 +4,7 @@
 #include "kvm/devices.h"
 #include "kvm/kvm-cpu.h"
 #include "kvm/rbtree-interval.h"
+#include "kvm/fdt.h"
 
 #include <stdbool.h>
 #include <limits.h>
@@ -31,7 +32,9 @@ struct ioport_operations {
 	bool (*io_in)(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size);
 	bool (*io_out)(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size);
 	void (*generate_fdt_node)(struct ioport *ioport, void *fdt,
-				  void (*generate_irq_prop)(void *fdt, u8 irq));
+				  void (*generate_irq_prop)(void *fdt,
+							    u8 irq,
+							    enum irq_type));
 };
 
 void ioport__setup_arch(struct kvm *kvm);

ioport.c

@@ -59,7 +59,8 @@ static void ioport_remove(struct rb_root *root, struct ioport *data)
 static void generate_ioport_fdt_node(void *fdt,
 				     struct device_header *dev_hdr,
 				     void (*generate_irq_prop)(void *fdt,
-							       u8 irq))
+							       u8 irq,
+							       enum irq_type))
 {
 	struct ioport *ioport = container_of(dev_hdr, struct ioport, dev_hdr);
 	struct ioport_operations *ops = ioport->ops;
@@ -71,7 +72,8 @@ static void generate_ioport_fdt_node(void *fdt,
 static void generate_ioport_fdt_node(void *fdt,
 				     struct device_header *dev_hdr,
 				     void (*generate_irq_prop)(void *fdt,
-							       u8 irq))
+							       u8 irq,
+							       enum irq_type))
 {
 	die("Unable to generate device tree nodes without libfdt\n");
 }

virtio/mmio.c

@@ -230,10 +230,12 @@ static void virtio_mmio_mmio_callback(struct kvm_cpu *vcpu,
 
 #ifdef CONFIG_HAS_LIBFDT
 #define DEVICE_NAME_MAX_LEN 32
-static void generate_virtio_mmio_fdt_node(void *fdt,
-					  struct device_header *dev_hdr,
-					  void (*generate_irq_prop)(void *fdt,
-								    u8 irq))
+static
+void generate_virtio_mmio_fdt_node(void *fdt,
+				   struct device_header *dev_hdr,
+				   void (*generate_irq_prop)(void *fdt,
+							     u8 irq,
+							     enum irq_type))
 {
 	char dev_name[DEVICE_NAME_MAX_LEN];
 	struct virtio_mmio *vmmio = container_of(dev_hdr,
@@ -250,7 +252,7 @@ static void generate_virtio_mmio_fdt_node(void *fdt,
 	_FDT(fdt_begin_node(fdt, dev_name));
 	_FDT(fdt_property_string(fdt, "compatible", "virtio,mmio"));
 	_FDT(fdt_property(fdt, "reg", reg_prop, sizeof(reg_prop)));
-	generate_irq_prop(fdt, vmmio->irq);
+	generate_irq_prop(fdt, vmmio->irq, IRQ_TYPE_EDGE_RISING);
 	_FDT(fdt_end_node(fdt));
 }
 #else