| Message ID | 20190918130633.4872-4-shameerali.kolothum.thodi@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ARM virt: ACPI memory hotplug support | expand |
On Wed, 18 Sep 2019 14:06:25 +0100 Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> wrote: > From: Samuel Ortiz <sameo@linux.intel.com> > > 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. This patch generates the AML code that > defines GEDs. > > Platforms need to specify their own GED Event bitmap to describe > what kind of events they want to support through GED. Also this > uses a 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. > > This supports only memory hotplug for now. > > Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> > Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com> > Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> > Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> > --- > Addressed comments from Igor. > - Removed memhp_state.is_enabled condition check and property. > - Used instance_init() instead of realize() > --- > hw/acpi/Kconfig | 4 + > hw/acpi/Makefile.objs | 1 + > hw/acpi/generic_event_device.c | 303 +++++++++++++++++++++++++ > include/hw/acpi/generic_event_device.h | 100 ++++++++ > 4 files changed, 408 insertions(+) > create mode 100644 hw/acpi/generic_event_device.c > create mode 100644 include/hw/acpi/generic_event_device.h > > diff --git a/hw/acpi/Kconfig b/hw/acpi/Kconfig > index 7c59cf900b..12e3f1e86e 100644 > --- a/hw/acpi/Kconfig > +++ b/hw/acpi/Kconfig > @@ -31,3 +31,7 @@ config ACPI_VMGENID > bool > default y > depends on PC > + > +config ACPI_HW_REDUCED > + bool > + depends on ACPI > diff --git a/hw/acpi/Makefile.objs b/hw/acpi/Makefile.objs > index 9bb2101e3b..655a9c1973 100644 > --- a/hw/acpi/Makefile.objs > +++ b/hw/acpi/Makefile.objs > @@ -6,6 +6,7 @@ common-obj-$(CONFIG_ACPI_MEMORY_HOTPLUG) += memory_hotplug.o > common-obj-$(CONFIG_ACPI_CPU_HOTPLUG) += cpu.o > common-obj-$(CONFIG_ACPI_NVDIMM) += nvdimm.o > common-obj-$(CONFIG_ACPI_VMGENID) += vmgenid.o > +common-obj-$(CONFIG_ACPI_HW_REDUCED) += generic_event_device.o > common-obj-$(call lnot,$(CONFIG_ACPI_X86)) += acpi-stub.o > > common-obj-y += acpi_interface.o > diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c > new file mode 100644 > index 0000000000..b94500b08d > --- /dev/null > +++ b/hw/acpi/generic_event_device.c > @@ -0,0 +1,303 @@ > +/* > + * > + * 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) > diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h > new file mode 100644 > index 0000000000..2049e8d873 > --- /dev/null > +++ b/include/hw/acpi/generic_event_device.h > @@ -0,0 +1,100 @@ > +/* > + * > + * 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. > + * > + * 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. Generic Event Device allows platforms > + * to handle interrupts in ACPI ASL statements. It follows a very > + * similar approach like the _EVT method from GPIO events. All > + * interrupts are listed in _CRS and the handler is written in _EVT > + * method. Here, we use 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. > + * > + * Here is an example. > + * > + * Device (\_SB.GED) > + * { > + * Name (_HID, "ACPI0013") > + * Name (_UID, Zero) > + * Name (_CRS, ResourceTemplate () > + * { > + * Interrupt (ResourceConsumer, Edge, ActiveHigh, Exclusive, ,, ) > + * { > + * 0x00000029, > + * } > + * }) > + * OperationRegion (EREG, SystemMemory, 0x09080000, 0x04) > + * Field (EREG, DWordAcc, NoLock, WriteAsZeros) > + * { > + * ESEL, 32 > + * } > + * > + * Method (_EVT, 1, Serialized) // _EVT: Event > + * { > + * Local0 = ESEL // ESEL = IO memory region which specifies the > + * // device type. > + * If (((Local0 & One) == One)) > + * { > + * MethodEvent1() > + * } > + * If ((Local0 & 0x2) == 0x2) > + * { > + * MethodEvent2() > + * } > + * ... > + * } > + * } > + * > + */ > + > +#ifndef HW_ACPI_GED_H > +#define HW_ACPI_GED_H > + > +#include "hw/sysbus.h" > +#include "hw/acpi/memory_hotplug.h" > + > +#define TYPE_ACPI_GED "acpi-ged" > +#define ACPI_GED(obj) \ > + OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED) > + > +#define ACPI_GED_EVT_SEL_OFFSET 0x0 > +#define ACPI_GED_EVT_SEL_LEN 0x4 > + > +#define GED_DEVICE "GED" > +#define AML_GED_EVT_REG "EREG" > +#define AML_GED_EVT_SEL "ESEL" > + > +/* > + * Platforms need to specify the GED event bitmap > + * to describe what kind of events they want to support > + * through GED. > + */ > +#define ACPI_GED_MEM_HOTPLUG_EVT 0x1 > + > +typedef struct GEDState { > + MemoryRegion io; > + uint32_t sel; > +} GEDState; > + > +typedef struct AcpiGedState { > + SysBusDevice parent_obj; > + MemHotplugState memhp_state; > + MemoryRegion container_memhp; > + GEDState ged_state; > + uint32_t ged_event_bitmap; > + qemu_irq irq; > +} AcpiGedState; > + > +void build_ged_aml(Aml *table, const char* name, HotplugHandler *hotplug_dev, > + uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base); > + > +#endif
diff --git a/hw/acpi/Kconfig b/hw/acpi/Kconfig index 7c59cf900b..12e3f1e86e 100644 --- a/hw/acpi/Kconfig +++ b/hw/acpi/Kconfig @@ -31,3 +31,7 @@ config ACPI_VMGENID bool default y depends on PC + +config ACPI_HW_REDUCED + bool + depends on ACPI diff --git a/hw/acpi/Makefile.objs b/hw/acpi/Makefile.objs index 9bb2101e3b..655a9c1973 100644 --- a/hw/acpi/Makefile.objs +++ b/hw/acpi/Makefile.objs @@ -6,6 +6,7 @@ common-obj-$(CONFIG_ACPI_MEMORY_HOTPLUG) += memory_hotplug.o common-obj-$(CONFIG_ACPI_CPU_HOTPLUG) += cpu.o common-obj-$(CONFIG_ACPI_NVDIMM) += nvdimm.o common-obj-$(CONFIG_ACPI_VMGENID) += vmgenid.o +common-obj-$(CONFIG_ACPI_HW_REDUCED) += generic_event_device.o common-obj-$(call lnot,$(CONFIG_ACPI_X86)) += acpi-stub.o common-obj-y += acpi_interface.o diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c new file mode 100644 index 0000000000..b94500b08d --- /dev/null +++ b/hw/acpi/generic_event_device.c @@ -0,0 +1,303 @@ +/* + * + * 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) diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h new file mode 100644 index 0000000000..2049e8d873 --- /dev/null +++ b/include/hw/acpi/generic_event_device.h @@ -0,0 +1,100 @@ +/* + * + * 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. + * + * 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. Generic Event Device allows platforms + * to handle interrupts in ACPI ASL statements. It follows a very + * similar approach like the _EVT method from GPIO events. All + * interrupts are listed in _CRS and the handler is written in _EVT + * method. Here, we use 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. + * + * Here is an example. + * + * Device (\_SB.GED) + * { + * Name (_HID, "ACPI0013") + * Name (_UID, Zero) + * Name (_CRS, ResourceTemplate () + * { + * Interrupt (ResourceConsumer, Edge, ActiveHigh, Exclusive, ,, ) + * { + * 0x00000029, + * } + * }) + * OperationRegion (EREG, SystemMemory, 0x09080000, 0x04) + * Field (EREG, DWordAcc, NoLock, WriteAsZeros) + * { + * ESEL, 32 + * } + * + * Method (_EVT, 1, Serialized) // _EVT: Event + * { + * Local0 = ESEL // ESEL = IO memory region which specifies the + * // device type. + * If (((Local0 & One) == One)) + * { + * MethodEvent1() + * } + * If ((Local0 & 0x2) == 0x2) + * { + * MethodEvent2() + * } + * ... + * } + * } + * + */ + +#ifndef HW_ACPI_GED_H +#define HW_ACPI_GED_H + +#include "hw/sysbus.h" +#include "hw/acpi/memory_hotplug.h" + +#define TYPE_ACPI_GED "acpi-ged" +#define ACPI_GED(obj) \ + OBJECT_CHECK(AcpiGedState, (obj), TYPE_ACPI_GED) + +#define ACPI_GED_EVT_SEL_OFFSET 0x0 +#define ACPI_GED_EVT_SEL_LEN 0x4 + +#define GED_DEVICE "GED" +#define AML_GED_EVT_REG "EREG" +#define AML_GED_EVT_SEL "ESEL" + +/* + * Platforms need to specify the GED event bitmap + * to describe what kind of events they want to support + * through GED. + */ +#define ACPI_GED_MEM_HOTPLUG_EVT 0x1 + +typedef struct GEDState { + MemoryRegion io; + uint32_t sel; +} GEDState; + +typedef struct AcpiGedState { + SysBusDevice parent_obj; + MemHotplugState memhp_state; + MemoryRegion container_memhp; + GEDState ged_state; + uint32_t ged_event_bitmap; + qemu_irq irq; +} AcpiGedState; + +void build_ged_aml(Aml *table, const char* name, HotplugHandler *hotplug_dev, + uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base); + +#endif