Re: [PATCH v2 08/13] acpi: generic event device for x86

[Igor Mammedov <imammedo@redhat.com>]

On Tue,  5 May 2020 15:43:00 +0200
Gerd Hoffmann <kraxel@redhat.com> wrote:

> Uses TYPE_ACPI_GED as QOM parent for code reuse.
> Add registers for sleep states and reset.
> Add powerdown notifier for power button events.
registers aren't x86 specific per spec,
can we put these registers into TYPE_ACPI_GED
and enable the optionally like is done with memory hotplug registers
in acpi_ged_initfn()

> Set AcpiDeviceIfClass->madt_cpu.
that's the only reason I could justify adding x86 specific flavour.

> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  include/hw/acpi/generic_event_device.h |  10 +++
>  hw/i386/generic_event_device_x86.c     | 114 +++++++++++++++++++++++++
>  hw/i386/Makefile.objs                  |   1 +
>  3 files changed, 125 insertions(+)
>  create mode 100644 hw/i386/generic_event_device_x86.c
> 
> diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h
> index 9eb86ca4fd94..16d1f2b3cd30 100644
> --- a/include/hw/acpi/generic_event_device.h
> +++ b/include/hw/acpi/generic_event_device.h
> @@ -68,9 +68,19 @@
>  #define ACPI_GED(obj) \
>      OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED)
>  
> +#define TYPE_ACPI_GED_X86 "acpi-ged-x86"
> +#define ACPI_GED_X86(obj) \
> +    OBJECT_CHECK(AcpiGedX86State, (obj), TYPE_ACPI_GED_X86)
> +
>  #define ACPI_GED_EVT_SEL_OFFSET    0x0
>  #define ACPI_GED_EVT_SEL_LEN       0x4
>  
> +#define ACPI_GED_X86_REG_SLEEP_CTL 0x00
> +#define ACPI_GED_X86_REG_SLEEP_STS 0x01
> +#define ACPI_GED_X86_REG_RESET     0x02
> +#define   ACPI_GED_X86_RESET_VALUE 0x42
> +#define ACPI_GED_X86_REG_COUNT     0x03
> +
>  #define GED_DEVICE      "GED"
>  #define AML_GED_EVT_REG "EREG"
>  #define AML_GED_EVT_SEL "ESEL"
> diff --git a/hw/i386/generic_event_device_x86.c b/hw/i386/generic_event_device_x86.c
> new file mode 100644
> index 000000000000..8ae4a63084f3
> --- /dev/null
> +++ b/hw/i386/generic_event_device_x86.c
> @@ -0,0 +1,114 @@
> +/*
> + * x86 variant of the generic event device for hw reduced acpi
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2 or later, as published by the Free Software Foundation.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "exec/address-spaces.h"
> +#include "hw/acpi/acpi.h"
> +#include "hw/acpi/generic_event_device.h"
> +#include "hw/i386/pc.h"
> +#include "hw/irq.h"
> +#include "hw/mem/pc-dimm.h"
> +#include "hw/qdev-properties.h"
> +#include "migration/vmstate.h"
> +#include "qemu/error-report.h"
> +#include "sysemu/runstate.h"
> +
> +typedef struct AcpiGedX86State {
> +    struct AcpiGedState parent_obj;
> +    MemoryRegion regs;
> +    Notifier powerdown_req;
> +} AcpiGedX86State;
> +
> +static uint64_t acpi_ged_x86_regs_read(void *opaque, hwaddr addr, unsigned size)
> +{
> +    return 0;
> +}
> +
> +static void acpi_ged_x86_regs_write(void *opaque, hwaddr addr, uint64_t data,
> +                                    unsigned int size)
> +{
> +    bool slp_en;
> +    int slp_typ;
> +
> +    switch (addr) {
> +    case ACPI_GED_X86_REG_SLEEP_CTL:
> +        slp_typ = (data >> 2) & 0x07;
> +        slp_en  = (data >> 5) & 0x01;
> +        if (slp_en && slp_typ == 5) {
> +            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> +        }
> +        return;
> +    case ACPI_GED_X86_REG_SLEEP_STS:
> +        return;
> +    case ACPI_GED_X86_REG_RESET:
> +        if (data == ACPI_GED_X86_RESET_VALUE) {
> +            qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> +        }
> +        return;
> +    }
> +}
> +
> +static const MemoryRegionOps acpi_ged_x86_regs_ops = {
> +    .read = acpi_ged_x86_regs_read,
> +    .write = acpi_ged_x86_regs_write,
> +    .endianness = DEVICE_LITTLE_ENDIAN,
> +    .valid = {
> +        .min_access_size = 1,
> +        .max_access_size = 1,
> +    },
> +};
> +
> +static void acpi_ged_x86_powerdown_req(Notifier *n, void *opaque)
> +{
> +    AcpiGedX86State *s = container_of(n, AcpiGedX86State, powerdown_req);
> +    AcpiDeviceIf *adev = ACPI_DEVICE_IF(s);
> +    AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(OBJECT(s));
> +
> +    adevc->send_event(adev, ACPI_POWER_DOWN_STATUS);
> +}
> +
> +static void acpi_ged_x86_initfn(Object *obj)
> +{
> +    AcpiGedX86State *s = ACPI_GED_X86(obj);
> +    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
> +
> +    memory_region_init_io(&s->regs, obj, &acpi_ged_x86_regs_ops,
> +                          obj, "acpi-regs", ACPI_GED_X86_REG_COUNT);
> +    sysbus_init_mmio(sbd, &s->regs);
> +
> +    s->powerdown_req.notify = acpi_ged_x86_powerdown_req;
> +    qemu_register_powerdown_notifier(&s->powerdown_req);
> +}
> +
> +static void acpi_ged_x86_class_init(ObjectClass *class, void *data)
> +{
> +    AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(class);
> +
> +    adevc->madt_cpu = pc_madt_cpu_entry;
> +}
> +
> +static const TypeInfo acpi_ged_x86_info = {
> +    .name          = TYPE_ACPI_GED_X86,
> +    .parent        = TYPE_ACPI_GED,
> +    .instance_size = sizeof(AcpiGedX86State),
> +    .instance_init  = acpi_ged_x86_initfn,
> +    .class_init    = acpi_ged_x86_class_init,
> +    .interfaces = (InterfaceInfo[]) {
> +        { TYPE_HOTPLUG_HANDLER },
> +        { TYPE_ACPI_DEVICE_IF },
> +        { }
> +    }
> +};
> +
> +static void acpi_ged_x86_register_types(void)
> +{
> +    type_register_static(&acpi_ged_x86_info);
> +}
> +
> +type_init(acpi_ged_x86_register_types)
> diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
> index 6abc74551a72..622739305882 100644
> --- a/hw/i386/Makefile.objs
> +++ b/hw/i386/Makefile.objs
> @@ -17,4 +17,5 @@ obj-$(CONFIG_PC) += port92.o
>  
>  obj-y += kvmvapic.o
>  obj-$(CONFIG_ACPI) += acpi-common.o
> +obj-$(CONFIG_ACPI_HW_REDUCED) += generic_event_device_x86.o
>  obj-$(CONFIG_PC) += acpi-build.o