hw/m68k/mcf_intc: Use qdev input gpios for input IRQs

The m68k mcf_intc interrupt controller currently implements its
inbound IRQ lines by calling qemu_allocate_irqs() in mcf_intc_init().
This results in leaks like this:

Direct leak of 2944 byte(s) in 46 object(s) allocated from:
    #0 0x5cf95ec15323 in malloc (/home/pm215/qemu/build/san/qemu-system-m68k+0xf9e323) (BuildId: 18d55ef8ea9856e68ee30802078af5050b8b06c5)
    #1 0x7637c65c5ac9 in g_malloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x62ac9) (BuildId: 116e142b9b52c8a4dfd403e759e71ab8f95d8bb3)
    #2 0x5cf95f6b2f27 in object_new_with_type /home/pm215/qemu/build/san/../../qom/object.c:767:15
    #3 0x5cf95f6aa62e in qemu_allocate_irq /home/pm215/qemu/build/san/../../hw/core/irq.c:91:25
    #4 0x5cf95f6aa62e in qemu_extend_irqs /home/pm215/qemu/build/san/../../hw/core/irq.c:79:16
    #5 0x5cf95f5f6d99 in mcf5208evb_init /home/pm215/qemu/build/san/../../hw/m68k/mcf5208.c:310:11

This isn't an important leak, as it is memory we allocate once at
QEMU startup and that has to stay live for the lifetime of the
system.  However it does point at a code improvement.

Modernise this to have the device itself create inbound GPIOs with
qdev_init_gpio_in() that the board can then refer to and wire up
individually.

As the device is used in only a single board, we can update device
and board in a single patch rather than having to try to figure out
some way to change the API more piecemeal.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <th.huth+qemu@posteo.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20260306190425.3047580-1-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/m68k/mcf5208.c

@@ -227,7 +227,7 @@ static const MemoryRegionOps m5208_rcm_ops = {
     .endianness = DEVICE_BIG_ENDIAN,
 };
 
-static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic,
+static void mcf5208_sys_init(MemoryRegion *address_space, DeviceState *intc,
                              M68kCPU *cpu)
 {
     MemoryRegion *iomem = g_new(MemoryRegion, 1);
@@ -250,11 +250,11 @@ static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic,
                               "m5208-timer", 0x00004000);
         memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
                                     &s->iomem);
-        s->irq = pic[4 + i];
+        s->irq = qdev_get_gpio_in(intc, 4 + i);
     }
 }
 
-static void mcf_fec_init(MemoryRegion *sysmem, hwaddr base, qemu_irq *irqs)
+static void mcf_fec_init(MemoryRegion *sysmem, hwaddr base, DeviceState *intc)
 {
     DeviceState *dev;
     SysBusDevice *s;
@@ -268,7 +268,7 @@ static void mcf_fec_init(MemoryRegion *sysmem, hwaddr base, qemu_irq *irqs)
     s = SYS_BUS_DEVICE(dev);
     sysbus_realize_and_unref(s, &error_fatal);
     for (i = 0; i < FEC_NUM_IRQ; i++) {
-        sysbus_connect_irq(s, i, irqs[i]);
+        sysbus_connect_irq(s, i, qdev_get_gpio_in(intc, i + 36));
     }
 
     memory_region_add_subregion(sysmem, base, sysbus_mmio_get_region(s, 0));
@@ -283,10 +283,10 @@ static void mcf5208evb_init(MachineState *machine)
     int kernel_size;
     uint64_t elf_entry;
     hwaddr entry;
-    qemu_irq *pic;
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *rom = g_new(MemoryRegion, 1);
     MemoryRegion *sram = g_new(MemoryRegion, 1);
+    DeviceState *intc;
 
     cpu = M68K_CPU(cpu_create(machine->cpu_type));
     env = &cpu->env;
@@ -307,17 +307,15 @@ static void mcf5208evb_init(MachineState *machine)
     memory_region_add_subregion(address_space_mem, 0x80000000, sram);
 
     /* Internal peripherals.  */
-    pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
+    intc = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
 
-    mcf_uart_create_mmap(0xfc060000, pic[26], serial_hd(0));
-    mcf_uart_create_mmap(0xfc064000, pic[27], serial_hd(1));
-    mcf_uart_create_mmap(0xfc068000, pic[28], serial_hd(2));
+    mcf_uart_create_mmap(0xfc060000, qdev_get_gpio_in(intc, 26), serial_hd(0));
+    mcf_uart_create_mmap(0xfc064000, qdev_get_gpio_in(intc, 27), serial_hd(1));
+    mcf_uart_create_mmap(0xfc068000, qdev_get_gpio_in(intc, 28), serial_hd(2));
 
-    mcf5208_sys_init(address_space_mem, pic, cpu);
+    mcf5208_sys_init(address_space_mem, intc, cpu);
 
-    mcf_fec_init(address_space_mem, 0xfc030000, pic + 36);
-
-    g_free(pic);
+    mcf_fec_init(address_space_mem, 0xfc030000, intc);
 
     /*  0xfc000000 SCM.  */
     /*  0xfc004000 XBS.  */

hw/m68k/mcf_intc.c

@@ -175,6 +175,7 @@ static void mcf_intc_instance_init(Object *obj)
 
     memory_region_init_io(&s->iomem, obj, &mcf_intc_ops, s, "mcf", 0x100);
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);
+    qdev_init_gpio_in(DEVICE(s), mcf_intc_set_irq, 64);
 }
 
 static const Property mcf_intc_properties[] = {
@@ -206,9 +207,7 @@ static void mcf_intc_register_types(void)
 
 type_init(mcf_intc_register_types)
 
-qemu_irq *mcf_intc_init(MemoryRegion *sysmem,
-                        hwaddr base,
-                        M68kCPU *cpu)
+DeviceState *mcf_intc_init(MemoryRegion *sysmem, hwaddr base, M68kCPU *cpu)
 {
     DeviceState  *dev;
 
@@ -218,6 +217,5 @@ qemu_irq *mcf_intc_init(MemoryRegion *sysmem,
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     memory_region_add_subregion(sysmem, base,
                                 sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0));
-
-    return qemu_allocate_irqs(mcf_intc_set_irq, dev, 64);
+    return dev;
 }

include/hw/m68k/mcf.h

@@ -14,9 +14,8 @@ DeviceState *mcf_uart_create(qemu_irq irq, Chardev *chr);
 DeviceState *mcf_uart_create_mmap(hwaddr base, qemu_irq irq, Chardev *chr);
 
 /* mcf_intc.c */
-qemu_irq *mcf_intc_init(struct MemoryRegion *sysmem,
-                        hwaddr base,
-                        M68kCPU *cpu);
+DeviceState *mcf_intc_init(struct MemoryRegion *sysmem,
+                           hwaddr base, M68kCPU *cpu);
 
 /* mcf5206.c */
 #define TYPE_MCF5206_MBAR "mcf5206-mbar"