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Tsirkin" , qemu-devel@nongnu.org, Shannon Zhao , qemu-arm@nongnu.org, Paolo Bonzini , Richard Henderson Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: kj3+6Db4tPFX On Wed, 20 May 2020 15:19:51 +0200 Gerd Hoffmann wrote: > Add control regs (sleep, reset) for hw-reduced acpi. > > Signed-off-by: Gerd Hoffmann this should be acompanied by docs update docs/specs/acpi_hw_reduced_hotplug.rst to document new registers and their semantics and probaly rename file to something more appropriate > --- > include/hw/acpi/generic_event_device.h | 7 ++++ > hw/acpi/generic_event_device.c | 44 ++++++++++++++++++++++++++ > 2 files changed, 51 insertions(+) > > diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h > index 90a9180db572..474c92198080 100644 > --- a/include/hw/acpi/generic_event_device.h > +++ b/include/hw/acpi/generic_event_device.h > @@ -72,6 +72,12 @@ > #define ACPI_GED_EVT_SEL_OFFSET 0x0 > #define ACPI_GED_EVT_SEL_LEN 0x4 > > +#define ACPI_GED_REG_SLEEP_CTL 0x00 > +#define ACPI_GED_REG_SLEEP_STS 0x01 > +#define ACPI_GED_REG_RESET 0x02 > +#define ACPI_GED_RESET_VALUE 0x42 > +#define ACPI_GED_REG_COUNT 0x03 > + > #define GED_DEVICE "GED" > #define AML_GED_EVT_REG "EREG" > #define AML_GED_EVT_SEL "ESEL" > @@ -87,6 +93,7 @@ > > typedef struct GEDState { > MemoryRegion evt; > + MemoryRegion regs; > uint32_t sel; > } GEDState; > > diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c > index 1cb34111e59a..3072fb4ab32b 100644 > --- a/hw/acpi/generic_event_device.c > +++ b/hw/acpi/generic_event_device.c > @@ -20,6 +20,7 @@ > #include "hw/qdev-properties.h" > #include "migration/vmstate.h" > #include "qemu/error-report.h" > +#include "sysemu/runstate.h" > > static const uint32_t ged_supported_events[] = { > ACPI_GED_MEM_HOTPLUG_EVT, > @@ -176,6 +177,45 @@ static const MemoryRegionOps ged_evt_ops = { > }, > }; > > +static uint64_t ged_regs_read(void *opaque, hwaddr addr, unsigned size) > +{ > + return 0; > +} > + > +static void ged_regs_write(void *opaque, hwaddr addr, uint64_t data, > + unsigned int size) > +{ > + bool slp_en; > + int slp_typ; > + > + switch (addr) { > + case ACPI_GED_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_REG_SLEEP_STS: > + return; > + case ACPI_GED_REG_RESET: > + if (data == ACPI_GED_RESET_VALUE) { > + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); > + } > + return; > + } > +} > + > +static const MemoryRegionOps ged_regs_ops = { > + .read = ged_regs_read, > + .write = ged_regs_write, > + .endianness = DEVICE_LITTLE_ENDIAN, > + .valid = { > + .min_access_size = 1, > + .max_access_size = 1, > + }, > +}; > + > static void acpi_ged_device_plug_cb(HotplugHandler *hotplug_dev, > DeviceState *dev, Error **errp) > { > @@ -305,6 +345,10 @@ static void acpi_ged_initfn(Object *obj) > sysbus_init_mmio(sbd, &s->container_memhp); > acpi_memory_hotplug_init(&s->container_memhp, OBJECT(dev), > &s->memhp_state, 0); > + > + memory_region_init_io(&ged_st->regs, obj, &ged_regs_ops, ged_st, > + TYPE_ACPI_GED "-regs", ACPI_GED_REG_COUNT); > + sysbus_init_mmio(sbd, &ged_st->regs); > } > > static void acpi_ged_class_init(ObjectClass *class, void *data)