[Qemu-devel] [PATCH-for-4.2 v8 9/9] hw/arm: Use GED for system_powerdown event

[Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>]

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>
---
v7 --> v8
 -Retained gpio based system_powerdown support for machines < 4.2.
 -Reuse of virt_powerdown_req() for ACPI GED use.
 -Dropped Eric's R-by for now because of above.

---
 hw/acpi/generic_event_device.c       |  2 ++
 hw/arm/virt-acpi-build.c             |  6 +++---
 hw/arm/virt.c                        | 27 ++++++++++++++++-----------
 include/hw/acpi/acpi_dev_interface.h |  1 +
 include/hw/arm/virt.h                |  1 +
 5 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index 0b3214eff4..f00b0ab14b 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -205,6 +205,8 @@ 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);
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 75657caa36..31bf2bf775 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -49,7 +49,6 @@
 #include "kvm_arm.h"
 
 #define ARM_SPI_BASE 32
-#define ACPI_POWER_BUTTON_DEVICE "PWRB"
 
 static void acpi_dsdt_add_cpus(Aml *scope, int smp_cpus)
 {
@@ -739,12 +738,13 @@ 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);
+    } else {
+        acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
+                           (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
     }
 
     if (vms->acpi_dev && ms->ram_slots) {
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 41386a6eb7..73a758d9a9 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -528,7 +528,7 @@ static inline DeviceState *create_acpi_ged(VirtMachineState *vms, qemu_irq *pic)
 {
     DeviceState *dev;
     int irq = vms->irqmap[VIRT_ACPI_GED];
-    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
+    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT | ACPI_GED_PWR_DOWN_EVT;
 
     dev = DEVICE(object_new(TYPE_ACPI_GED));
     qdev_prop_set_uint64(dev, "memhp-base",
@@ -784,13 +784,15 @@ 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);
 
-static Notifier virt_system_powerdown_notifier = {
-    .notify = virt_powerdown_req
-};
+    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)
 {
@@ -833,9 +835,6 @@ static void create_gpio(const VirtMachineState *vms, qemu_irq *pic)
     qemu_fdt_setprop_cells(vms->fdt, "/gpio-keys/poweroff",
                            "gpios", phandle, 3, 0);
 
-    /* connect powerdown request */
-    qemu_register_powerdown_notifier(&virt_system_powerdown_notifier);
-
     g_free(nodename);
 }
 
@@ -1721,12 +1720,18 @@ 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 */
+    vms->powerdown_notifier.notify = virt_powerdown_req;
+    qemu_register_powerdown_notifier(&vms->powerdown_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/acpi_dev_interface.h b/include/hw/acpi/acpi_dev_interface.h
index 43ff119179..adcb3a816c 100644
--- a/include/hw/acpi/acpi_dev_interface.h
+++ b/include/hw/acpi/acpi_dev_interface.h
@@ -11,6 +11,7 @@ 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"
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 577ee49b4b..0b41083e9d 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -137,6 +137,7 @@ typedef struct {
     int psci_conduit;
     hwaddr highest_gpa;
     DeviceState *acpi_dev;
+    Notifier powerdown_notifier;
 } VirtMachineState;
 
 #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
-- 
2.17.1