hw/acpi/generic_event_device.c

   1 /*
   2  *
   3  * Copyright (c) 2018 Intel Corporation
   4  * Copyright (c) 2019 Huawei Technologies R & D (UK) Ltd
   5  * Written by Samuel Ortiz, Shameer Kolothum
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2 or later, as published by the Free Software Foundation.
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "qapi/error.h"
  14 #include "exec/address-spaces.h"
  15 #include "hw/acpi/acpi.h"
  16 #include "hw/acpi/generic_event_device.h"
  17 #include "hw/irq.h"
  18 #include "hw/mem/pc-dimm.h"
  19 #include "hw/mem/nvdimm.h"
  20 #include "hw/qdev-properties.h"
  21 #include "migration/vmstate.h"
  22 #include "qemu/error-report.h"
  23
  24 static const uint32_t ged_supported_events[] = {
  25     ACPI_GED_MEM_HOTPLUG_EVT,
  26     ACPI_GED_PWR_DOWN_EVT,
  27     ACPI_GED_NVDIMM_HOTPLUG_EVT,
  28 };
  29
  30 /*
  31  * The ACPI Generic Event Device (GED) is a hardware-reduced specific
  32  * device[ACPI v6.1 Section 5.6.9] that handles all platform events,
  33  * including the hotplug ones. Platforms need to specify their own
  34  * GED Event bitmap to describe what kind of events they want to support
  35  * through GED. This routine uses a single interrupt for the GED device,
  36  * relying on IO memory region to communicate the type of device
  37  * affected by the interrupt. This way, we can support up to 32 events
  38  * with a unique interrupt.
  39  */
  40 void build_ged_aml(Aml *table, const char *name, HotplugHandler *hotplug_dev,
  41                    uint32_t ged_irq, AmlRegionSpace rs, hwaddr ged_base)
  42 {
  43     AcpiGedState *s = ACPI_GED(hotplug_dev);
  44     Aml *crs = aml_resource_template();
  45     Aml *evt, *field;
  46     Aml *dev = aml_device("%s", name);
  47     Aml *evt_sel = aml_local(0);
  48     Aml *esel = aml_name(AML_GED_EVT_SEL);
  49
  50     /* _CRS interrupt */
  51     aml_append(crs, aml_interrupt(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
  52                                   AML_EXCLUSIVE, &ged_irq, 1));
  53
  54     aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0013")));
  55     aml_append(dev, aml_name_decl("_UID", aml_string(GED_DEVICE)));
  56     aml_append(dev, aml_name_decl("_CRS", crs));
  57
  58     /* Append IO region */
  59     aml_append(dev, aml_operation_region(AML_GED_EVT_REG, rs,
  60                aml_int(ged_base + ACPI_GED_EVT_SEL_OFFSET),
  61                ACPI_GED_EVT_SEL_LEN));
  62     field = aml_field(AML_GED_EVT_REG, AML_DWORD_ACC, AML_NOLOCK,
  63                       AML_WRITE_AS_ZEROS);
  64     aml_append(field, aml_named_field(AML_GED_EVT_SEL,
  65                                       ACPI_GED_EVT_SEL_LEN * BITS_PER_BYTE));
  66     aml_append(dev, field);
  67
  68     /*
  69      * For each GED event we:
  70      * - Add a conditional block for each event, inside a loop.
  71      * - Call a method for each supported GED event type.
  72      *
  73      * The resulting ASL code looks like:
  74      *
  75      * Local0 = ESEL
  76      * If ((Local0 & One) == One)
  77      * {
  78      *     MethodEvent0()
  79      * }
  80      *
  81      * If ((Local0 & 0x2) == 0x2)
  82      * {
  83      *     MethodEvent1()
  84      * }
  85      * ...
  86      */
  87     evt = aml_method("_EVT", 1, AML_SERIALIZED);
  88     {
  89         Aml *if_ctx;
  90         uint32_t i;
  91         uint32_t ged_events = ctpop32(s->ged_event_bitmap);
  92
  93         /* Local0 = ESEL */
  94         aml_append(evt, aml_store(esel, evt_sel));
  95
  96         for (i = 0; i < ARRAY_SIZE(ged_supported_events) && ged_events; i++) {
  97             uint32_t event = s->ged_event_bitmap & ged_supported_events[i];
  98
  99             if (!event) {
 100                 continue;
 101             }
 102
 103             if_ctx = aml_if(aml_equal(aml_and(evt_sel, aml_int(event), NULL),
 104                                       aml_int(event)));
 105             switch (event) {
 106             case ACPI_GED_MEM_HOTPLUG_EVT:
 107                 aml_append(if_ctx, aml_call0(MEMORY_DEVICES_CONTAINER "."
 108                                              MEMORY_SLOT_SCAN_METHOD));
 109                 break;
 110             case ACPI_GED_PWR_DOWN_EVT:
 111                 aml_append(if_ctx,
 112                            aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
 113                                       aml_int(0x80)));
 114                 break;
 115             case ACPI_GED_NVDIMM_HOTPLUG_EVT:
 116                 aml_append(if_ctx,
 117                            aml_notify(aml_name("\\_SB.NVDR"),
 118                                       aml_int(0x80)));
 119                 break;
 120             default:
 121                 /*
 122                  * Please make sure all the events in ged_supported_events[]
 123                  * are handled above.
 124                  */
 125                 g_assert_not_reached();
 126             }
 127
 128             aml_append(evt, if_ctx);
 129             ged_events--;
 130         }
 131
 132         if (ged_events) {
 133             error_report("Unsupported events specified");
 134             abort();
 135         }
 136     }
 137
 138     /* Append _EVT method */
 139     aml_append(dev, evt);
 140
 141     aml_append(table, dev);
 142 }
 143
 144 /* Memory read by the GED _EVT AML dynamic method */
 145 static uint64_t ged_read(void *opaque, hwaddr addr, unsigned size)
 146 {
 147     uint64_t val = 0;
 148     GEDState *ged_st = opaque;
 149
 150     switch (addr) {
 151     case ACPI_GED_EVT_SEL_OFFSET:
 152         /* Read the selector value and reset it */
 153         val = ged_st->sel;
 154         ged_st->sel = 0;
 155         break;
 156     default:
 157         break;
 158     }
 159
 160     return val;
 161 }
 162
 163 /* Nothing is expected to be written to the GED memory region */
 164 static void ged_write(void *opaque, hwaddr addr, uint64_t data,
 165                       unsigned int size)
 166 {
 167 }
 168
 169 static const MemoryRegionOps ged_ops = {
 170     .read = ged_read,
 171     .write = ged_write,
 172     .endianness = DEVICE_LITTLE_ENDIAN,
 173     .valid = {
 174         .min_access_size = 4,
 175         .max_access_size = 4,
 176     },
 177 };
 178
 179 static void acpi_ged_device_plug_cb(HotplugHandler *hotplug_dev,
 180                                     DeviceState *dev, Error **errp)
 181 {
 182     AcpiGedState *s = ACPI_GED(hotplug_dev);
 183
 184     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
 185         if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
 186             nvdimm_acpi_plug_cb(hotplug_dev, dev);
 187         } else {
 188             acpi_memory_plug_cb(hotplug_dev, &s->memhp_state, dev, errp);
 189         }
 190     } else {
 191         error_setg(errp, "virt: device plug request for unsupported device"
 192                    " type: %s", object_get_typename(OBJECT(dev)));
 193     }
 194 }
 195
 196 static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
 197 {
 198     AcpiGedState *s = ACPI_GED(adev);
 199     GEDState *ged_st = &s->ged_state;
 200     uint32_t sel;
 201
 202     if (ev & ACPI_MEMORY_HOTPLUG_STATUS) {
 203         sel = ACPI_GED_MEM_HOTPLUG_EVT;
 204     } else if (ev & ACPI_POWER_DOWN_STATUS) {
 205         sel = ACPI_GED_PWR_DOWN_EVT;
 206     } else if (ev & ACPI_NVDIMM_HOTPLUG_STATUS) {
 207         sel = ACPI_GED_NVDIMM_HOTPLUG_EVT;
 208     } else {
 209         /* Unknown event. Return without generating interrupt. */
 210         warn_report("GED: Unsupported event %d. No irq injected", ev);
 211         return;
 212     }
 213
 214     /*
 215      * Set the GED selector field to communicate the event type.
 216      * This will be read by GED aml code to select the appropriate
 217      * event method.
 218      */
 219     ged_st->sel |= sel;
 220
 221     /* Trigger the event by sending an interrupt to the guest. */
 222     qemu_irq_pulse(s->irq);
 223 }
 224
 225 static Property acpi_ged_properties[] = {
 226     DEFINE_PROP_UINT32("ged-event", AcpiGedState, ged_event_bitmap, 0),
 227     DEFINE_PROP_END_OF_LIST(),
 228 };
 229
 230 static const VMStateDescription vmstate_memhp_state = {
 231     .name = "acpi-ged/memhp",
 232     .version_id = 1,
 233     .minimum_version_id = 1,
 234     .fields      = (VMStateField[]) {
 235         VMSTATE_MEMORY_HOTPLUG(memhp_state, AcpiGedState),
 236         VMSTATE_END_OF_LIST()
 237     }
 238 };
 239
 240 static const VMStateDescription vmstate_ged_state = {
 241     .name = "acpi-ged-state",
 242     .version_id = 1,
 243     .minimum_version_id = 1,
 244     .fields      = (VMStateField[]) {
 245         VMSTATE_UINT32(sel, GEDState),
 246         VMSTATE_END_OF_LIST()
 247     }
 248 };
 249
 250 static const VMStateDescription vmstate_acpi_ged = {
 251     .name = "acpi-ged",
 252     .version_id = 1,
 253     .minimum_version_id = 1,
 254     .fields = (VMStateField[]) {
 255         VMSTATE_STRUCT(ged_state, AcpiGedState, 1, vmstate_ged_state, GEDState),
 256         VMSTATE_END_OF_LIST(),
 257     },
 258     .subsections = (const VMStateDescription * []) {
 259         &vmstate_memhp_state,
 260         NULL
 261     }
 262 };
 263
 264 static void acpi_ged_initfn(Object *obj)
 265 {
 266     DeviceState *dev = DEVICE(obj);
 267     AcpiGedState *s = ACPI_GED(dev);
 268     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 269     GEDState *ged_st = &s->ged_state;
 270
 271     memory_region_init_io(&ged_st->io, obj, &ged_ops, ged_st,
 272                           TYPE_ACPI_GED, ACPI_GED_EVT_SEL_LEN);
 273     sysbus_init_mmio(sbd, &ged_st->io);
 274
 275     sysbus_init_irq(sbd, &s->irq);
 276
 277     s->memhp_state.is_enabled = true;
 278     /*
 279      * GED handles memory hotplug event and acpi-mem-hotplug
 280      * memory region gets initialized here. Create an exclusive
 281      * container for memory hotplug IO and expose it as GED sysbus
 282      * MMIO so that boards can map it separately.
 283      */
 284      memory_region_init(&s->container_memhp, OBJECT(dev), "memhp container",
 285                         MEMORY_HOTPLUG_IO_LEN);
 286      sysbus_init_mmio(sbd, &s->container_memhp);
 287      acpi_memory_hotplug_init(&s->container_memhp, OBJECT(dev),
 288                               &s->memhp_state, 0);
 289 }
 290
 291 static void acpi_ged_class_init(ObjectClass *class, void *data)
 292 {
 293     DeviceClass *dc = DEVICE_CLASS(class);
 294     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(class);
 295     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(class);
 296
 297     dc->desc = "ACPI Generic Event Device";
 298     device_class_set_props(dc, acpi_ged_properties);
 299     dc->vmsd = &vmstate_acpi_ged;
 300
 301     hc->plug = acpi_ged_device_plug_cb;
 302
 303     adevc->send_event = acpi_ged_send_event;
 304 }
 305
 306 static const TypeInfo acpi_ged_info = {
 307     .name          = TYPE_ACPI_GED,
 308     .parent        = TYPE_SYS_BUS_DEVICE,
 309     .instance_size = sizeof(AcpiGedState),
 310     .instance_init  = acpi_ged_initfn,
 311     .class_init    = acpi_ged_class_init,
 312     .interfaces = (InterfaceInfo[]) {
 313         { TYPE_HOTPLUG_HANDLER },
 314         { TYPE_ACPI_DEVICE_IF },
 315         { }
 316     }
 317 };
 318
 319 static void acpi_ged_register_types(void)
 320 {
 321     type_register_static(&acpi_ged_info);
 322 }
 323
 324 type_init(acpi_ged_register_types)