Re: [PATCH v5 3/7] arm/virt: Wire up GPIO error source for ACPI / GHES

[Jonathan Cameron <Jonathan.Cameron@Huawei.com>]

On Fri,  2 Aug 2024 23:43:58 +0200
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:

Do we need to rename this now there is a GED involved?
Is it even technically a GPIO any more?
Spec says in 18.3.2.7 
HW-reduced ACPI platforms signal the error using a GPIO
interrupt or another interrupt declared under
a generic event device (Interrupt-signaled ACPI events)
and goes on to say that a _CRS entry is used to
list the interrupt.

Give the Generic Event Device has a _CRS
with aml_interrupt() as the type I think we should
even have the hest entry say it's an interrupt (external?)
rather than a gpio.


> 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>

Again, more or less fine with this
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
to go with that co-auth

> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
>  hw/acpi/ghes.c           |  3 +++
>  hw/arm/virt-acpi-build.c |  1 +
>  hw/arm/virt.c            | 16 +++++++++++++++-
>  include/hw/acpi/ghes.h   |  3 +++
>  include/hw/arm/virt.h    |  1 +
>  5 files changed, 23 insertions(+), 1 deletion(-)
> 
> 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..f8bbe3e7a0b8 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -858,6 +858,7 @@ 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..8b315328154f 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;
> @@ -1009,6 +1010,15 @@ static void virt_powerdown_req(Notifier *n, void *opaque)
>      }
>  }
>  
> +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);
> +    }
> +}
> +
>  static void create_gpio_keys(char *fdt, DeviceState *pl061_dev,
>                               uint32_t phandle)
>  {
> @@ -2397,6 +2407,10 @@ 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..ad9f6e94dcc5 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -175,6 +175,7 @@ struct VirtMachineState {
>      DeviceState *gic;
>      DeviceState *acpi_dev;
>      Notifier powerdown_notifier;
> +    Notifier generic_error_notifier;
>      PCIBus *bus;
>      char *oem_id;
>      char *oem_table_id;