Re: [PATCH v3 2/7] arm/virt: Wire up GPIO error source for ACPI / GHES

From: Mauro Carvalho Chehab
Date: Wed Jul 31 2024 - 01:18:02 EST

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In reply to: Igor Mammedov: "Re: [PATCH v3 2/7] arm/virt: Wire up GPIO error source for ACPI / GHES"
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Em Tue, 30 Jul 2024 10:36:15 +0200
Igor Mammedov <imammedo@xxxxxxxxxx> escreveu:

> On Mon, 22 Jul 2024 08:45:54 +0200
> Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> wrote:
>
> > From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> >
> > Creates a GED - Generic Event Device and set a GPIO to
> > be used or error injection.
>
> QEMU already has GED device, so question is why it wasn't
> used for event delivery?
> I nutshell, I'd really prefer this series being rewritten
> to reuse exiting GED instead of adding ad hoc GPIO and ACPI
> plumbing.

Makes sense. I'll split this one on two patches, the first
one adding the error device PNP to acpi/generic_event_device,
and the second one with ghes and arm virt changes to support
it, using a notifier list inside ghes to signalize the error
events.

Jonathan,

As the logic will be different, I'm placing you as co-author,
and adding you as Cc on the patches. If you're ok with that,
please reply with your SoB to them when I submit the next patch
series.

> PS:
> as side effect of that, error injection could be used no only for
> ARM but other machines that use GED (providing they implement GHES)
>
> Also CCing Shameer wrt touched power button code
>
> > [mchehab: use a define for the generic event pin number and do some cleanups]
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
> > ---
> > hw/arm/virt-acpi-build.c | 30 ++++++++++++++++++++++++++----
> > hw/arm/virt.c | 14 ++++++++++++--
> > include/hw/arm/virt.h | 1 +
> > include/hw/boards.h | 1 +
> > 4 files changed, 40 insertions(+), 6 deletions(-)
> >
> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> > index f76fb117adff..c502ccf40909 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)
> > @@ -142,6 +143,8 @@ 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)
>
> this function supposed to be called when acpi_dev is not present (exiting GED device)
> and run on old machines only, so it should not be called for recent machine types.
> I'd avoid adding anything to it.
>
> see more comment about it below
>
> > {
> > + 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 +158,12 @@ 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 for generic error */
> > + 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 +174,11 @@ 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 +813,15 @@ 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")));
> this is not _event_ device, it's referred as _error_ device in spec.
>
> PS:
> please properly document new ACPI primitives/devices,
> see comment above aml_notify() for example.
> Use earliest APIC spec where the device was defined for the 1st time.
>
> > + 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)
> > @@ -841,10 +863,9 @@ 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));
>
> wouldn't that create double/conflicting power button handlers
> (GPIO and GED one), on recent machine types GED should be used
> and power button in acpi_dsdt_add_gpio() is used only if
> machine doesn't have GED.
>
> >
> > if (vms->acpi_dev) {
> > uint32_t event = object_property_get_uint(OBJECT(vms->acpi_dev),
> > @@ -858,6 +879,7 @@ 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 c99c8b1713c6..f81cf3a69961 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);
> > @@ -1015,6 +1022,9 @@ 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,
> > 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 +2395,8 @@ 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);
>
> again, this create duplicate/conflicting power button source
>
> >
> > if (vms->secure && !vmc->no_secure_gpio) {
> > create_gpio_devices(vms, VIRT_SECURE_GPIO, secure_sysmem);
> > @@ -3101,6 +3110,7 @@ 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/arm/virt.h b/include/hw/arm/virt.h
> > index a4d937ed45ac..c9769d7d4d7f 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,
> > 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);
> > };
> >
> > /**
>

Thanks,
Mauro

Next message: Arseniy Krasnov: "Re: [PATCH v1] MAINTAINERS: add me as reviewer of AF_VSOCK and virtio-vsock"
Previous message: CK Hu (胡俊光): "Re: [PATCH v6 4/5] media: platform: mediatek: isp_30: add mediatek ISP3.0 camsv"
In reply to: Igor Mammedov: "Re: [PATCH v3 2/7] arm/virt: Wire up GPIO error source for ACPI / GHES"
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