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qemu/hw/acpi/generic_event_device.c

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/*
*
* Copyright (c) 2018 Intel Corporation
* Copyright (c) 2019 Huawei Technologies R & D (UK) Ltd
* Written by Samuel Ortiz, Shameer Kolothum
*
* 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/irq.h"
#include "hw/mem/pc-dimm.h"
#include "hw/mem/nvdimm.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qemu/error-report.h"
static const uint32_t ged_supported_events[] = {
ACPI_GED_MEM_HOTPLUG_EVT,
ACPI_GED_PWR_DOWN_EVT,
ACPI_GED_NVDIMM_HOTPLUG_EVT,
};
/*
* The ACPI Generic Event Device (GED) is a hardware-reduced specific
* device[ACPI v6.1 Section 5.6.9] that handles all platform events,
* including the hotplug ones. Platforms need to specify their own
* GED Event bitmap to describe what kind of events they want to support
* through GED. This routine uses a single interrupt for the GED device,
* relying on IO memory region to communicate the type of device
* affected by the interrupt. This way, we can support up to 32 events
* with a unique interrupt.
*/
void build_ged_aml(Aml *table, const char *name, HotplugHandler *hotplug_dev,
uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base)
{
AcpiGedState *s = ACPI_GED(hotplug_dev);
Aml *crs = aml_resource_template();
Aml *evt, *field;
Aml *dev = aml_device("%s", name);
Aml *evt_sel = aml_local(0);
Aml *esel = aml_name(AML_GED_EVT_SEL);
/* _CRS interrupt */
aml_append(crs, aml_interrupt(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
AML_EXCLUSIVE, &ged_irq, 1));
aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0013")));
aml_append(dev, aml_name_decl("_UID", aml_string(GED_DEVICE)));
aml_append(dev, aml_name_decl("_CRS", crs));
/* Append IO region */
aml_append(dev, aml_operation_region(AML_GED_EVT_REG, rs,
aml_int(ged_base + ACPI_GED_EVT_SEL_OFFSET),
ACPI_GED_EVT_SEL_LEN));
field = aml_field(AML_GED_EVT_REG, AML_DWORD_ACC, AML_NOLOCK,
AML_WRITE_AS_ZEROS);
aml_append(field, aml_named_field(AML_GED_EVT_SEL,
ACPI_GED_EVT_SEL_LEN * BITS_PER_BYTE));
aml_append(dev, field);
/*
* For each GED event we:
* - Add a conditional block for each event, inside a loop.
* - Call a method for each supported GED event type.
*
* The resulting ASL code looks like:
*
* Local0 = ESEL
* If ((Local0 & One) == One)
* {
* MethodEvent0()
* }
*
* If ((Local0 & 0x2) == 0x2)
* {
* MethodEvent1()
* }
* ...
*/
evt = aml_method("_EVT", 1, AML_SERIALIZED);
{
Aml *if_ctx;
uint32_t i;
uint32_t ged_events = ctpop32(s->ged_event_bitmap);
/* Local0 = ESEL */
aml_append(evt, aml_store(esel, evt_sel));
for (i = 0; i < ARRAY_SIZE(ged_supported_events) && ged_events; i++) {
uint32_t event = s->ged_event_bitmap & ged_supported_events[i];
if (!event) {
continue;
}
if_ctx = aml_if(aml_equal(aml_and(evt_sel, aml_int(event), NULL),
aml_int(event)));
switch (event) {
case ACPI_GED_MEM_HOTPLUG_EVT:
aml_append(if_ctx, aml_call0(MEMORY_DEVICES_CONTAINER "."
MEMORY_SLOT_SCAN_METHOD));
break;
case ACPI_GED_PWR_DOWN_EVT:
aml_append(if_ctx,
aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
aml_int(0x80)));
break;
case ACPI_GED_NVDIMM_HOTPLUG_EVT:
aml_append(if_ctx,
aml_notify(aml_name("\\_SB.NVDR"),
aml_int(0x80)));
break;
default:
/*
* Please make sure all the events in ged_supported_events[]
* are handled above.
*/
g_assert_not_reached();
}
aml_append(evt, if_ctx);
ged_events--;
}
if (ged_events) {
error_report("Unsupported events specified");
abort();
}
}
/* Append _EVT method */
aml_append(dev, evt);
aml_append(table, dev);
}
/* Memory read by the GED _EVT AML dynamic method */
static uint64_t ged_evt_read(void *opaque, hwaddr addr, unsigned size)
{
uint64_t val = 0;
GEDState *ged_st = opaque;
switch (addr) {
case ACPI_GED_EVT_SEL_OFFSET:
/* Read the selector value and reset it */
val = ged_st->sel;
ged_st->sel = 0;
break;
default:
break;
}
return val;
}
/* Nothing is expected to be written to the GED memory region */
static void ged_evt_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
}
static const MemoryRegionOps ged_evt_ops = {
.read = ged_evt_read,
.write = ged_evt_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void acpi_ged_device_plug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
AcpiGedState *s = ACPI_GED(hotplug_dev);
if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
nvdimm_acpi_plug_cb(hotplug_dev, dev);
} else {
acpi_memory_plug_cb(hotplug_dev, &s->memhp_state, dev, errp);
}
} else {
error_setg(errp, "virt: device plug request for unsupported device"
" type: %s", object_get_typename(OBJECT(dev)));
}
}
static void acpi_ged_unplug_request_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
AcpiGedState *s = ACPI_GED(hotplug_dev);
if ((object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) &&
!(object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)))) {
acpi_memory_unplug_request_cb(hotplug_dev, &s->memhp_state, dev, errp);
} else {
error_setg(errp, "acpi: device unplug request for unsupported device"
" type: %s", object_get_typename(OBJECT(dev)));
}
}
static void acpi_ged_unplug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
AcpiGedState *s = ACPI_GED(hotplug_dev);
if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
acpi_memory_unplug_cb(&s->memhp_state, dev, errp);
} else {
error_setg(errp, "acpi: device unplug for unsupported device"
" type: %s", object_get_typename(OBJECT(dev)));
}
}
static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
{
AcpiGedState *s = ACPI_GED(adev);
GEDState *ged_st = &s->ged_state;
uint32_t sel;
if (ev & ACPI_MEMORY_HOTPLUG_STATUS) {
sel = ACPI_GED_MEM_HOTPLUG_EVT;
} else if (ev & ACPI_POWER_DOWN_STATUS) {
sel = ACPI_GED_PWR_DOWN_EVT;
} else if (ev & ACPI_NVDIMM_HOTPLUG_STATUS) {
sel = ACPI_GED_NVDIMM_HOTPLUG_EVT;
} else {
/* Unknown event. Return without generating interrupt. */
warn_report("GED: Unsupported event %d. No irq injected", ev);
return;
}
/*
* Set the GED selector field to communicate the event type.
* This will be read by GED aml code to select the appropriate
* event method.
*/
ged_st->sel |= sel;
/* Trigger the event by sending an interrupt to the guest. */
qemu_irq_pulse(s->irq);
}
static Property acpi_ged_properties[] = {
DEFINE_PROP_UINT32("ged-event", AcpiGedState, ged_event_bitmap, 0),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vmstate_memhp_state = {
.name = "acpi-ged/memhp",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_MEMORY_HOTPLUG(memhp_state, AcpiGedState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_ged_state = {
.name = "acpi-ged-state",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(sel, GEDState),
VMSTATE_END_OF_LIST()
}
};
static bool ghes_needed(void *opaque)
{
AcpiGedState *s = opaque;
return s->ghes_state.ghes_addr_le;
}
static const VMStateDescription vmstate_ghes_state = {
.name = "acpi-ged/ghes",
.version_id = 1,
.minimum_version_id = 1,
.needed = ghes_needed,
.fields = (VMStateField[]) {
VMSTATE_STRUCT(ghes_state, AcpiGedState, 1,
vmstate_ghes_state, AcpiGhesState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_acpi_ged = {
.name = "acpi-ged",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_STRUCT(ged_state, AcpiGedState, 1, vmstate_ged_state, GEDState),
VMSTATE_END_OF_LIST(),
},
.subsections = (const VMStateDescription * []) {
&vmstate_memhp_state,
&vmstate_ghes_state,
NULL
}
};
static void acpi_ged_initfn(Object *obj)
{
DeviceState *dev = DEVICE(obj);
AcpiGedState *s = ACPI_GED(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
GEDState *ged_st = &s->ged_state;
memory_region_init_io(&ged_st->evt, obj, &ged_evt_ops, ged_st,
TYPE_ACPI_GED, ACPI_GED_EVT_SEL_LEN);
sysbus_init_mmio(sbd, &ged_st->evt);
sysbus_init_irq(sbd, &s->irq);
s->memhp_state.is_enabled = true;
/*
* GED handles memory hotplug event and acpi-mem-hotplug
* memory region gets initialized here. Create an exclusive
* container for memory hotplug IO and expose it as GED sysbus
* MMIO so that boards can map it separately.
*/
memory_region_init(&s->container_memhp, OBJECT(dev), "memhp container",
MEMORY_HOTPLUG_IO_LEN);
sysbus_init_mmio(sbd, &s->container_memhp);
acpi_memory_hotplug_init(&s->container_memhp, OBJECT(dev),
&s->memhp_state, 0);
}
static void acpi_ged_class_init(ObjectClass *class, void *data)
{
DeviceClass *dc = DEVICE_CLASS(class);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(class);
AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(class);
dc->desc = "ACPI Generic Event Device";
device_class_set_props(dc, acpi_ged_properties);
dc->vmsd = &vmstate_acpi_ged;
hc->plug = acpi_ged_device_plug_cb;
hc->unplug_request = acpi_ged_unplug_request_cb;
hc->unplug = acpi_ged_unplug_cb;
adevc->send_event = acpi_ged_send_event;
}
static const TypeInfo acpi_ged_info = {
.name = TYPE_ACPI_GED,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AcpiGedState),
.instance_init = acpi_ged_initfn,
.class_init = acpi_ged_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ TYPE_ACPI_DEVICE_IF },
{ }
}
};
static void acpi_ged_register_types(void)
{
type_register_static(&acpi_ged_info);
}
type_init(acpi_ged_register_types)
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