Adds support to ARM virtualization to allow handling
a General Purpose Event (GPE) via GED error device.

It is aligned with Linux Kernel patch:
https://lore.kernel.org/lkml/1272350481-27951-8-git-send-email-ying.huang@intel.com/

Co-authored-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Co-authored-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 hw/acpi/ghes.c           |  3 +++
 hw/arm/virt-acpi-build.c | 21 +++++++++++++++++----
 hw/arm/virt.c            | 26 +++++++++++++++++++++++---
 include/hw/acpi/ghes.h   |  3 +++
 include/hw/arm/virt.h    |  2 ++
 5 files changed, 48 insertions(+), 7 deletions(-)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index e9511d9b8f71..8d0262e6c1aa 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -444,6 +444,9 @@ int acpi_ghes_record_errors(uint8_t source_id, uint64_t physical_address)
     return ret;
 }
 
+NotifierList generic_error_notifiers =
+    NOTIFIER_LIST_INITIALIZER(error_device_notifiers);
+
 bool acpi_ghes_present(void)
 {
     AcpiGedState *acpi_ged_state;
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index f76fb117adff..cdd1c6d9f1a3 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -142,6 +142,8 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
 static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
                                            uint32_t gpio_irq)
 {
+    uint32_t pin;
+
     Aml *dev = aml_device("GPO0");
     aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0061")));
     aml_append(dev, aml_name_decl("_UID", aml_int(0)));
@@ -155,7 +157,12 @@ static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
 
     Aml *aei = aml_resource_template();
 
-    const uint32_t pin = GPIO_PIN_POWER_BUTTON;
+    pin = GPIO_PIN_POWER_BUTTON;
+    aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
+                                 AML_EXCLUSIVE, AML_PULL_UP, 0, &pin, 1,
+                                 "GPO0", NULL, 0));
+
+    pin = GPIO_PIN_GENERIC_ERROR;
     aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
                                  AML_EXCLUSIVE, AML_PULL_UP, 0, &pin, 1,
                                  "GPO0", NULL, 0));
@@ -166,6 +173,12 @@ static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
     aml_append(method, aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
                                   aml_int(0x80)));
     aml_append(dev, method);
+
+    method = aml_method("_E06", 0, AML_NOTSERIALIZED);
+    aml_append(method, aml_notify(aml_name(ACPI_APEI_ERROR_DEVICE),
+                                  aml_int(0x80)));
+    aml_append(dev, method);
+
     aml_append(scope, dev);
 }
 
@@ -841,10 +854,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
                       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));
     }
+    acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
+                       irqmap[VIRT_GPIO] + ARM_SPI_BASE);
 
     if (vms->acpi_dev) {
         uint32_t event = object_property_get_uint(OBJECT(vms->acpi_dev),
@@ -858,6 +870,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
     }
 
     acpi_dsdt_add_power_button(scope);
+    acpi_dsdt_add_error_device(scope);
 #ifdef CONFIG_TPM
     acpi_dsdt_add_tpm(scope, vms);
 #endif
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 687fe0bb8bc9..e76cc9690788 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -73,6 +73,7 @@
 #include "standard-headers/linux/input.h"
 #include "hw/arm/smmuv3.h"
 #include "hw/acpi/acpi.h"
+#include "hw/acpi/ghes.h"
 #include "target/arm/cpu-qom.h"
 #include "target/arm/internals.h"
 #include "target/arm/multiprocessing.h"
@@ -677,7 +678,7 @@ static inline DeviceState *create_acpi_ged(VirtMachineState *vms)
     DeviceState *dev;
     MachineState *ms = MACHINE(vms);
     int irq = vms->irqmap[VIRT_ACPI_GED];
-    uint32_t event = ACPI_GED_PWR_DOWN_EVT;
+    uint32_t event = ACPI_GED_PWR_DOWN_EVT | ACPI_GED_ERROR_EVT;
 
     if (ms->ram_slots) {
         event |= ACPI_GED_MEM_HOTPLUG_EVT;
@@ -1009,12 +1010,28 @@ static void virt_powerdown_req(Notifier *n, void *opaque)
     }
 }
 
+static DeviceState *gpio_error_dev;
+static void virt_generic_error_req(Notifier *n, void *opaque)
+{
+    VirtMachineState *s = container_of(n, VirtMachineState, generic_error_notifier);
+
+    if (s->acpi_dev) {
+        acpi_send_event(s->acpi_dev, ACPI_GENERIC_ERROR);
+    } else {
+        /* use gpio Pin for power button event */
+        qemu_set_irq(qdev_get_gpio_in(gpio_error_dev, 0), 1);
+    }
+}
+
 static void create_gpio_keys(char *fdt, DeviceState *pl061_dev,
                              uint32_t phandle)
 {
     gpio_key_dev = sysbus_create_simple("gpio-key", -1,
                                         qdev_get_gpio_in(pl061_dev,
                                                          GPIO_PIN_POWER_BUTTON));
+    gpio_error_dev = sysbus_create_simple("gpio-key", -1,
+                                          qdev_get_gpio_in(pl061_dev,
+                                                           GPIO_PIN_GENERIC_ERROR));
 
     qemu_fdt_add_subnode(fdt, "/gpio-keys");
     qemu_fdt_setprop_string(fdt, "/gpio-keys", "compatible", "gpio-keys");
@@ -2385,9 +2402,8 @@ static void machvirt_init(MachineState *machine)
 
     if (has_ged && aarch64 && firmware_loaded && virt_is_acpi_enabled(vms)) {
         vms->acpi_dev = create_acpi_ged(vms);
-    } else {
-        create_gpio_devices(vms, VIRT_GPIO, sysmem);
     }
+    create_gpio_devices(vms, VIRT_GPIO, sysmem);
 
     if (vms->secure && !vmc->no_secure_gpio) {
         create_gpio_devices(vms, VIRT_SECURE_GPIO, secure_sysmem);
@@ -2397,6 +2413,10 @@ static void machvirt_init(MachineState *machine)
      vms->powerdown_notifier.notify = virt_powerdown_req;
      qemu_register_powerdown_notifier(&vms->powerdown_notifier);
 
+     vms->generic_error_notifier.notify = virt_generic_error_req;
+     notifier_list_add(&generic_error_notifiers,
+                       &vms->generic_error_notifier);
+
     /* Create mmio transports, so the user can create virtio backends
      * (which will be automatically plugged in to the transports). If
      * no backend is created the transport will just sit harmlessly idle.
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 674f6958e905..6891eafff5ab 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -23,6 +23,9 @@
 #define ACPI_GHES_H
 
 #include "hw/acpi/bios-linker-loader.h"
+#include "qemu/notify.h"
+
+extern NotifierList generic_error_notifiers;
 
 /*
  * Values for Hardware Error Notification Type field
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index a4d937ed45ac..0cbe9a05605f 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -49,6 +49,7 @@
 
 /* GPIO pins */
 #define GPIO_PIN_POWER_BUTTON  3
+#define GPIO_PIN_GENERIC_ERROR 6
 
 enum {
     VIRT_FLASH,
@@ -175,6 +176,7 @@ struct VirtMachineState {
     DeviceState *gic;
     DeviceState *acpi_dev;
     Notifier powerdown_notifier;
+    Notifier generic_error_notifier;
     PCIBus *bus;
     char *oem_id;
     char *oem_table_id;
-- 
2.45.2