/* * * 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/qdev-properties.h" #include "migration/vmstate.h" #include "qemu/error-report.h" static const uint32_t ged_supported_events[] = { ACPI_GED_MEM_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; 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_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_write(void *opaque, hwaddr addr, uint64_t data, unsigned int size) { } static const MemoryRegionOps ged_ops = { .read = ged_read, .write = ged_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)) { 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_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 { /* 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 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, 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->io, obj, &ged_ops, ged_st, TYPE_ACPI_GED, ACPI_GED_EVT_SEL_LEN); sysbus_init_mmio(sbd, &ged_st->io); 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"; dc->props = acpi_ged_properties; dc->vmsd = &vmstate_acpi_ged; hc->plug = acpi_ged_device_plug_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)