hw/arm: Use GED for system_powerdown event

For machines 4.2 or higher with ACPI boot use GED for system_powerdown
event instead of GPIO. Guest boot with DT still uses GPIO.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20190918130633.4872-9-shameerali.kolothum.thodi@huawei.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/generic_event_device.c

@@ -22,6 +22,7 @@
 
 static const uint32_t ged_supported_events[] = {
     ACPI_GED_MEM_HOTPLUG_EVT,
+    ACPI_GED_PWR_DOWN_EVT,
 };
 
 /*
@@ -104,6 +105,11 @@ void build_ged_aml(Aml *table, const char *name, HotplugHandler *hotplug_dev,
                 aml_append(if_ctx, aml_call0(MEMORY_DEVICES_CONTAINER "."
                                              MEMORY_SLOT_SCAN_METHOD));
                 break;
+            case ACPI_GED_PWR_DOWN_EVT:
+                aml_append(if_ctx,
+                           aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
+                                      aml_int(0x80)));
+                break;
             default:
                 /*
                  * Please make sure all the events in ged_supported_events[]
@@ -184,6 +190,8 @@ static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
 
     if (ev & ACPI_MEMORY_HOTPLUG_STATUS) {
         sel = ACPI_GED_MEM_HOTPLUG_EVT;
+    } else if (ev & ACPI_POWER_DOWN_STATUS) {
+        sel = ACPI_GED_PWR_DOWN_EVT;
     } else {
         /* Unknown event. Return without generating interrupt. */
         warn_report("GED: Unsupported event %d. No irq injected", ev);

hw/arm/virt-acpi-build.c

@@ -50,7 +50,6 @@
 #include "migration/vmstate.h"
 
 #define ARM_SPI_BASE 32
-#define ACPI_POWER_BUTTON_DEVICE "PWRB"
 
 static void acpi_dsdt_add_cpus(Aml *scope, int smp_cpus)
 {
@@ -741,13 +740,14 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
                     (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
     acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
                       vms->highmem, vms->highmem_ecam);
-    acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
-                       (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
     if (vms->acpi_dev) {
         build_ged_aml(scope, "\\_SB."GED_DEVICE,
                       HOTPLUG_HANDLER(vms->acpi_dev),
                       irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE, AML_SYSTEM_MEMORY,
                       memmap[VIRT_ACPI_GED].base);
+    } else {
+        acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
+                           (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
     }
 
     if (vms->acpi_dev) {

hw/arm/virt.c

@@ -536,10 +536,10 @@ static inline DeviceState *create_acpi_ged(VirtMachineState *vms, qemu_irq *pic)
     DeviceState *dev;
     MachineState *ms = MACHINE(vms);
     int irq = vms->irqmap[VIRT_ACPI_GED];
-    uint32_t event = 0;
+    uint32_t event = ACPI_GED_PWR_DOWN_EVT;
 
     if (ms->ram_slots) {
-        event = ACPI_GED_MEM_HOTPLUG_EVT;
+        event |= ACPI_GED_MEM_HOTPLUG_EVT;
     }
 
     dev = qdev_create(NULL, TYPE_ACPI_GED);
@@ -793,8 +793,14 @@ static void create_rtc(const VirtMachineState *vms, qemu_irq *pic)
 static DeviceState *gpio_key_dev;
 static void virt_powerdown_req(Notifier *n, void *opaque)
 {
-    /* use gpio Pin 3 for power button event */
-    qemu_set_irq(qdev_get_gpio_in(gpio_key_dev, 0), 1);
+    VirtMachineState *s = container_of(n, VirtMachineState, powerdown_notifier);
+
+    if (s->acpi_dev) {
+        acpi_send_event(s->acpi_dev, ACPI_POWER_DOWN_STATUS);
+    } else {
+        /* use gpio Pin 3 for power button event */
+        qemu_set_irq(qdev_get_gpio_in(gpio_key_dev, 0), 1);
+    }
 }
 
 static void create_gpio(const VirtMachineState *vms, qemu_irq *pic)
@@ -1723,10 +1729,10 @@ static void machvirt_init(MachineState *machine)
 
     create_pcie(vms, pic);
 
-    create_gpio(vms, pic);
-
     if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
         vms->acpi_dev = create_acpi_ged(vms, pic);
+    } else {
+        create_gpio(vms, pic);
     }
 
      /* connect powerdown request */

include/hw/acpi/acpi_dev_interface.h

@@ -13,6 +13,7 @@ typedef enum {
     ACPI_MEMORY_HOTPLUG_STATUS = 8,
     ACPI_NVDIMM_HOTPLUG_STATUS = 16,
     ACPI_VMGENID_CHANGE_STATUS = 32,
+    ACPI_POWER_DOWN_STATUS = 64,
 } AcpiEventStatusBits;
 
 #define TYPE_ACPI_DEVICE_IF "acpi-device-interface"

include/hw/acpi/generic_event_device.h

@@ -62,6 +62,8 @@
 #include "hw/sysbus.h"
 #include "hw/acpi/memory_hotplug.h"
 
+#define ACPI_POWER_BUTTON_DEVICE "PWRB"
+
 #define TYPE_ACPI_GED "acpi-ged"
 #define ACPI_GED(obj) \
     OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED)
@@ -79,6 +81,7 @@
  * through GED.
  */
 #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
+#define ACPI_GED_PWR_DOWN_EVT      0x2
 
 typedef struct GEDState {
     MemoryRegion io;