Re: [Qemu-devel] [PATCH-for-4.2 v7 09/10] hw/arm: Use GED for system_powerdown event

[Shameerali Kolothum Thodi]

> -----Original Message-----
> From: Qemu-devel
> [mailto:qemu-devel-bounces+shameerali.kolothum.thodi=huawei.com@nongn
> u.org] On Behalf Of Igor Mammedov
> Sent: 18 July 2019 14:03
> To: Shameerali Kolothum Thodi <address@hidden>
> Cc: address@hidden; address@hidden;
> address@hidden; address@hidden;
> address@hidden; xuwei (O) <address@hidden>; Linuxarm
> <address@hidden>; address@hidden; address@hidden;
> address@hidden; address@hidden
> Subject: Re: [Qemu-devel] [PATCH-for-4.2 v7 09/10] hw/arm: Use GED for
> system_powerdown event
> 
> On Tue, 16 Jul 2019 16:38:15 +0100
> Shameer Kolothum <address@hidden> wrote:
> 
> > Use GED for system_powerdown event instead of GPIO for ACPI.
> > Guest boot with DT still uses GPIO.
> 
> 
> I'd hate to keep ACPI GPIO around but taking in account migration
> wouldn't this patch break ACPI GPIO based button on 4.0 and older where
> GED is not available and guest was booted as ACPI one and then rebooted on
> new QEMU?

Hmm..That looks like a valid case unfortunately :(. I will keep the GPIO then.

Thanks,
Shameer
 
> 
> > Signed-off-by: Shameer Kolothum <address@hidden>
> > Reviewed-by: Eric Auger <address@hidden>
> > ---
> >  hw/arm/virt-acpi-build.c | 37 +------------------------------------
> >  hw/arm/virt.c            |  6 +++---
> >  2 files changed, 4 insertions(+), 39 deletions(-)
> >
> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> > index 75657caa36..9178ca8e40 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)
> >  {
> > @@ -328,37 +327,6 @@ static void acpi_dsdt_add_pci(Aml *scope, const
> MemMapEntry *memmap,
> >      aml_append(scope, dev);
> >  }
> >
> > -static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry
> *gpio_memmap,
> > -                                           uint32_t gpio_irq)
> > -{
> > -    Aml *dev = aml_device("GPO0");
> > -    aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0061")));
> > -    aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> > -    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> > -
> > -    Aml *crs = aml_resource_template();
> > -    aml_append(crs, aml_memory32_fixed(gpio_memmap->base,
> gpio_memmap->size,
> > -                                       AML_READ_WRITE));
> > -    aml_append(crs, aml_interrupt(AML_CONSUMER, AML_LEVEL,
> AML_ACTIVE_HIGH,
> > -                                  AML_EXCLUSIVE, &gpio_irq, 1));
> > -    aml_append(dev, aml_name_decl("_CRS", crs));
> > -
> > -    Aml *aei = aml_resource_template();
> > -    /* Pin 3 for power button */
> > -    const uint32_t pin_list[1] = {3};
> > -    aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE,
> AML_ACTIVE_HIGH,
> > -                                 AML_EXCLUSIVE, AML_PULL_UP, 0,
> pin_list, 1,
> > -                                 "GPO0", NULL, 0));
> > -    aml_append(dev, aml_name_decl("_AEI", aei));
> > -
> > -    /* _E03 is handle for power button */
> > -    Aml *method = aml_method("_E03", 0, AML_NOTSERIALIZED);
> > -    aml_append(method,
> aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
> > -                                  aml_int(0x80)));
> > -    aml_append(dev, method);
> > -    aml_append(scope, dev);
> > -}
> > -
> >  static void acpi_dsdt_add_power_button(Aml *scope)
> >  {
> >      Aml *dev = aml_device(ACPI_POWER_BUTTON_DEVICE);
> > @@ -739,9 +707,8 @@ 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) {
> > +        acpi_dsdt_add_power_button(scope);
> >          build_ged_aml(scope, "\\_SB."GED_DEVICE,
> >                        HOTPLUG_HANDLER(vms->acpi_dev),
> >                        irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE,
> AML_SYSTEM_MEMORY);
> > @@ -752,8 +719,6 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> VirtMachineState *vms)
> >                                   AML_SYSTEM_MEMORY);
> >      }
> >
> > -    acpi_dsdt_add_power_button(scope);
> > -
> >      aml_append(dsdt, scope);
> >
> >      /* copy AML table into ACPI tables blob and patch header there */
> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> > index ffcccc05ad..6e55c25c5f 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",
> > @@ -1718,10 +1718,10 @@ static void machvirt_init(MachineState
> *machine)
> >
> >      create_pcie(vms, pic);
> >
> > -    create_gpio(vms, pic);
> > -
> >      if (!vmc->no_acpi_dev && aarch64 && firmware_loaded &&
> acpi_enabled) {
> >          vms->acpi_dev = create_acpi_ged(vms, pic);
> > +    } else {
> > +        create_gpio(vms, pic);
> >      }
> >
> >      /* Create mmio transports, so the user can create virtio backends
>