[1/6] arm/virt: Wire up GPIO error source for ACPI / GHES

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Creates a GED - Generic Event Device and set a GPIO to
be used or error injection.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 hw/arm/virt-acpi-build.c | 29 +++++++++++++++++++++++++----
 hw/arm/virt.c            | 12 +++++++++++-
 include/hw/boards.h      |  1 +
 3 files changed, 37 insertions(+), 5 deletions(-)

On Thu, Jul 11, 2024 at 11:52:03AM +0200, Mauro Carvalho Chehab wrote:
> From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 
> Creates a GED - Generic Event Device and set a GPIO to
> be used or error injection.
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
>  hw/arm/virt-acpi-build.c | 29 +++++++++++++++++++++++++----
>  hw/arm/virt.c            | 12 +++++++++++-
>  include/hw/boards.h      |  1 +
>  3 files changed, 37 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index e10cad86dd73..b6f2e55014a2 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -63,6 +63,7 @@
>  
>  #define ARM_SPI_BASE 32
>  
> +#define ACPI_GENERIC_EVENT_DEVICE "GEDD"
>  #define ACPI_BUILD_TABLE_SIZE             0x20000
>  
>  static void acpi_dsdt_add_cpus(Aml *scope, VirtMachineState *vms)
> @@ -155,9 +156,14 @@ static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
>  
>      Aml *aei = aml_resource_template();
>      /* Pin 3 for power button */
> -    const uint32_t pin_list[1] = {3};
> +    uint32_t pin = 3;
>      aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
> -                                 AML_EXCLUSIVE, AML_PULL_UP, 0, pin_list, 1,
> +                                 AML_EXCLUSIVE, AML_PULL_UP, 0, &pin, 1,
> +                                 "GPO0", NULL, 0));
> +    pin = 6;
> +    /* Pin 8 for generic error */

For real? Code says 6, comment says 8.

Comments must come before the code they comment, not after it,
then this kind of thing won't happen.


> +    aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
> +                                 AML_EXCLUSIVE, AML_PULL_UP, 0, &pin, 1,
>                                   "GPO0", NULL, 0));
>      aml_append(dev, aml_name_decl("_AEI", aei));
>  
> @@ -166,6 +172,11 @@ 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_GENERIC_EVENT_DEVICE),
> +                                  aml_int(0x80)));
> +    aml_append(dev, method);
> +
>      aml_append(scope, dev);
>  }
>  
> @@ -800,6 +811,15 @@ static void build_fadt_rev6(GArray *table_data, BIOSLinker *linker,
>      build_fadt(table_data, linker, &fadt, vms->oem_id, vms->oem_table_id);
>  }
>  
> +static void acpi_dsdt_add_generic_event_device(Aml *scope)
> +{
> +    Aml *dev = aml_device(ACPI_GENERIC_EVENT_DEVICE);
> +    aml_append(dev, aml_name_decl("_HID", aml_string("PNP0C33")));
> +    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> +    aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
> +    aml_append(scope, dev);
> +}
> +
>  /* DSDT */
>  static void
>  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
> @@ -842,9 +862,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>                        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 +878,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      }
>  
>      acpi_dsdt_add_power_button(scope);
> +    acpi_dsdt_add_generic_event_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 b0c68d66a345..874a8612ef2d 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -997,6 +997,13 @@ static void create_rtc(const VirtMachineState *vms)
>  }
>  
>  static DeviceState *gpio_key_dev;
> +
> +static DeviceState *gpio_error_dev;
> +static void virt_set_error(void)
> +{
> +    qemu_set_irq(qdev_get_gpio_in(gpio_error_dev, 0), 1);
> +}
> +
>  static void virt_powerdown_req(Notifier *n, void *opaque)
>  {
>      VirtMachineState *s = container_of(n, VirtMachineState, powerdown_notifier);
> @@ -1014,6 +1021,8 @@ static void create_gpio_keys(char *fdt, DeviceState *pl061_dev,
>  {
>      gpio_key_dev = sysbus_create_simple("gpio-key", -1,
>                                          qdev_get_gpio_in(pl061_dev, 3));
> +    gpio_error_dev = sysbus_create_simple("gpio-key", -1,
> +                                          qdev_get_gpio_in(pl061_dev, 6));
>  
>      qemu_fdt_add_subnode(fdt, "/gpio-keys");
>      qemu_fdt_setprop_string(fdt, "/gpio-keys", "compatible", "gpio-keys");
> @@ -2385,8 +2394,8 @@ 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);
> @@ -3100,6 +3109,7 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
>      mc->default_ram_id = "mach-virt.ram";
>      mc->default_nic = "virtio-net-pci";
>  
> +    mc->set_error = virt_set_error;
>      object_class_property_add(oc, "acpi", "OnOffAuto",
>          virt_get_acpi, virt_set_acpi,
>          NULL, NULL);
> diff --git a/include/hw/boards.h b/include/hw/boards.h
> index ef6f18f2c1a7..6cf01f3934ae 100644
> --- a/include/hw/boards.h
> +++ b/include/hw/boards.h
> @@ -304,6 +304,7 @@ struct MachineClass {
>      const CPUArchIdList *(*possible_cpu_arch_ids)(MachineState *machine);
>      int64_t (*get_default_cpu_node_id)(const MachineState *ms, int idx);
>      ram_addr_t (*fixup_ram_size)(ram_addr_t size);
> +    void (*set_error)(void);
>  };
>  
>  /**
> -- 
> 2.45.2

On Thu, 11 Jul 2024 at 12:54, Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Thu, Jul 11, 2024 at 11:52:03AM +0200, Mauro Carvalho Chehab wrote:
> > From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> >
> > Creates a GED - Generic Event Device and set a GPIO to
> > be used or error injection.
> >
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> > ---
> >  hw/arm/virt-acpi-build.c | 29 +++++++++++++++++++++++++----
> >  hw/arm/virt.c            | 12 +++++++++++-
> >  include/hw/boards.h      |  1 +
> >  3 files changed, 37 insertions(+), 5 deletions(-)
> >
> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> > index e10cad86dd73..b6f2e55014a2 100644
> > --- a/hw/arm/virt-acpi-build.c
> > +++ b/hw/arm/virt-acpi-build.c
> > @@ -63,6 +63,7 @@
> >
> >  #define ARM_SPI_BASE 32
> >
> > +#define ACPI_GENERIC_EVENT_DEVICE "GEDD"
> >  #define ACPI_BUILD_TABLE_SIZE             0x20000
> >
> >  static void acpi_dsdt_add_cpus(Aml *scope, VirtMachineState *vms)
> > @@ -155,9 +156,14 @@ static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
> >
> >      Aml *aei = aml_resource_template();
> >      /* Pin 3 for power button */
> > -    const uint32_t pin_list[1] = {3};
> > +    uint32_t pin = 3;
> >      aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
> > -                                 AML_EXCLUSIVE, AML_PULL_UP, 0, pin_list, 1,
> > +                                 AML_EXCLUSIVE, AML_PULL_UP, 0, &pin, 1,
> > +                                 "GPO0", NULL, 0));
> > +    pin = 6;
> > +    /* Pin 8 for generic error */
>
> For real? Code says 6, comment says 8.
>
> Comments must come before the code they comment, not after it,
> then this kind of thing won't happen.

It might also be nice to have a symbolic constant for the
pin number somewhere, so we don't rely on the magic number here and...

> > @@ -1014,6 +1021,8 @@ static void create_gpio_keys(char *fdt, DeviceState *pl061_dev,
> >  {
> >      gpio_key_dev = sysbus_create_simple("gpio-key", -1,
> >                                          qdev_get_gpio_in(pl061_dev, 3));
> > +    gpio_error_dev = sysbus_create_simple("gpio-key", -1,
> > +                                          qdev_get_gpio_in(pl061_dev, 6));

...here being the same.

Then if the code says "pin = VIRT_GPIO_ERROR_PIN" or something
similar the comment isn't required because the code is clear
without it.

(This is already a problem for the power-button pin 3, so we could
do an initial cleanup patch to sort out pin 3 first).

thanks
-- PMM