hw/acpi/memory_hotplug.c

   1 #include "hw/acpi/memory_hotplug.h"
   2 #include "hw/acpi/pc-hotplug.h"
   3 #include "hw/mem/pc-dimm.h"
   4 #include "hw/boards.h"
   5 #include "hw/qdev-core.h"
   6 #include "trace.h"
   7 #include "qapi-event.h"
   8
   9 static ACPIOSTInfo *acpi_memory_device_status(int slot, MemStatus *mdev)
  10 {
  11     ACPIOSTInfo *info = g_new0(ACPIOSTInfo, 1);
  12
  13     info->slot_type = ACPI_SLOT_TYPE_DIMM;
  14     info->slot = g_strdup_printf("%d", slot);
  15     info->source = mdev->ost_event;
  16     info->status = mdev->ost_status;
  17     if (mdev->dimm) {
  18         DeviceState *dev = DEVICE(mdev->dimm);
  19         if (dev->id) {
  20             info->device = g_strdup(dev->id);
  21             info->has_device = true;
  22         }
  23     }
  24     return info;
  25 }
  26
  27 void acpi_memory_ospm_status(MemHotplugState *mem_st, ACPIOSTInfoList ***list)
  28 {
  29     int i;
  30
  31     for (i = 0; i < mem_st->dev_count; i++) {
  32         ACPIOSTInfoList *elem = g_new0(ACPIOSTInfoList, 1);
  33         elem->value = acpi_memory_device_status(i, &mem_st->devs[i]);
  34         elem->next = NULL;
  35         **list = elem;
  36         *list = &elem->next;
  37     }
  38 }
  39
  40 static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr,
  41                                          unsigned int size)
  42 {
  43     uint32_t val = 0;
  44     MemHotplugState *mem_st = opaque;
  45     MemStatus *mdev;
  46     Object *o;
  47
  48     if (mem_st->selector >= mem_st->dev_count) {
  49         trace_mhp_acpi_invalid_slot_selected(mem_st->selector);
  50         return 0;
  51     }
  52
  53     mdev = &mem_st->devs[mem_st->selector];
  54     o = OBJECT(mdev->dimm);
  55     switch (addr) {
  56     case 0x0: /* Lo part of phys address where DIMM is mapped */
  57         val = o ? object_property_get_int(o, PC_DIMM_ADDR_PROP, NULL) : 0;
  58         trace_mhp_acpi_read_addr_lo(mem_st->selector, val);
  59         break;
  60     case 0x4: /* Hi part of phys address where DIMM is mapped */
  61         val = o ? object_property_get_int(o, PC_DIMM_ADDR_PROP, NULL) >> 32 : 0;
  62         trace_mhp_acpi_read_addr_hi(mem_st->selector, val);
  63         break;
  64     case 0x8: /* Lo part of DIMM size */
  65         val = o ? object_property_get_int(o, PC_DIMM_SIZE_PROP, NULL) : 0;
  66         trace_mhp_acpi_read_size_lo(mem_st->selector, val);
  67         break;
  68     case 0xc: /* Hi part of DIMM size */
  69         val = o ? object_property_get_int(o, PC_DIMM_SIZE_PROP, NULL) >> 32 : 0;
  70         trace_mhp_acpi_read_size_hi(mem_st->selector, val);
  71         break;
  72     case 0x10: /* node proximity for _PXM method */
  73         val = o ? object_property_get_int(o, PC_DIMM_NODE_PROP, NULL) : 0;
  74         trace_mhp_acpi_read_pxm(mem_st->selector, val);
  75         break;
  76     case 0x14: /* pack and return is_* fields */
  77         val |= mdev->is_enabled   ? 1 : 0;
  78         val |= mdev->is_inserting ? 2 : 0;
  79         val |= mdev->is_removing  ? 4 : 0;
  80         trace_mhp_acpi_read_flags(mem_st->selector, val);
  81         break;
  82     default:
  83         val = ~0;
  84         break;
  85     }
  86     return val;
  87 }
  88
  89 static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
  90                                       unsigned int size)
  91 {
  92     MemHotplugState *mem_st = opaque;
  93     MemStatus *mdev;
  94     ACPIOSTInfo *info;
  95     DeviceState *dev = NULL;
  96     HotplugHandler *hotplug_ctrl = NULL;
  97     Error *local_err = NULL;
  98
  99     if (!mem_st->dev_count) {
 100         return;
 101     }
 102
 103     if (addr) {
 104         if (mem_st->selector >= mem_st->dev_count) {
 105             trace_mhp_acpi_invalid_slot_selected(mem_st->selector);
 106             return;
 107         }
 108     }
 109
 110     switch (addr) {
 111     case 0x0: /* DIMM slot selector */
 112         mem_st->selector = data;
 113         trace_mhp_acpi_write_slot(mem_st->selector);
 114         break;
 115     case 0x4: /* _OST event  */
 116         mdev = &mem_st->devs[mem_st->selector];
 117         if (data == 1) {
 118             /* TODO: handle device insert OST event */
 119         } else if (data == 3) {
 120             /* TODO: handle device remove OST event */
 121         }
 122         mdev->ost_event = data;
 123         trace_mhp_acpi_write_ost_ev(mem_st->selector, mdev->ost_event);
 124         break;
 125     case 0x8: /* _OST status */
 126         mdev = &mem_st->devs[mem_st->selector];
 127         mdev->ost_status = data;
 128         trace_mhp_acpi_write_ost_status(mem_st->selector, mdev->ost_status);
 129         /* TODO: implement memory removal on guest signal */
 130
 131         info = acpi_memory_device_status(mem_st->selector, mdev);
 132         qapi_event_send_acpi_device_ost(info, &error_abort);
 133         qapi_free_ACPIOSTInfo(info);
 134         break;
 135     case 0x14: /* set is_* fields  */
 136         mdev = &mem_st->devs[mem_st->selector];
 137         if (data & 2) { /* clear insert event */
 138             mdev->is_inserting  = false;
 139             trace_mhp_acpi_clear_insert_evt(mem_st->selector);
 140         } else if (data & 4) {
 141             mdev->is_removing = false;
 142             trace_mhp_acpi_clear_remove_evt(mem_st->selector);
 143         } else if (data & 8) {
 144             if (!mdev->is_enabled) {
 145                 trace_mhp_acpi_ejecting_invalid_slot(mem_st->selector);
 146                 break;
 147             }
 148
 149             dev = DEVICE(mdev->dimm);
 150             hotplug_ctrl = qdev_get_hotplug_handler(dev);
 151             /* call pc-dimm unplug cb */
 152             hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
 153             if (local_err) {
 154                 trace_mhp_acpi_pc_dimm_delete_failed(mem_st->selector);
 155                 qapi_event_send_mem_unplug_error(dev->id,
 156                                                  error_get_pretty(local_err),
 157                                                  &error_abort);
 158                 error_free(local_err);
 159                 break;
 160             }
 161             trace_mhp_acpi_pc_dimm_deleted(mem_st->selector);
 162         }
 163         break;
 164     default:
 165         break;
 166     }
 167
 168 }
 169 static const MemoryRegionOps acpi_memory_hotplug_ops = {
 170     .read = acpi_memory_hotplug_read,
 171     .write = acpi_memory_hotplug_write,
 172     .endianness = DEVICE_LITTLE_ENDIAN,
 173     .valid = {
 174         .min_access_size = 1,
 175         .max_access_size = 4,
 176     },
 177 };
 178
 179 void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
 180                               MemHotplugState *state)
 181 {
 182     MachineState *machine = MACHINE(qdev_get_machine());
 183
 184     state->dev_count = machine->ram_slots;
 185     if (!state->dev_count) {
 186         return;
 187     }
 188
 189     state->devs = g_malloc0(sizeof(*state->devs) * state->dev_count);
 190     memory_region_init_io(&state->io, owner, &acpi_memory_hotplug_ops, state,
 191                           "acpi-mem-hotplug", ACPI_MEMORY_HOTPLUG_IO_LEN);
 192     memory_region_add_subregion(as, ACPI_MEMORY_HOTPLUG_BASE, &state->io);
 193 }
 194
 195 /**
 196  * acpi_memory_slot_status:
 197  * @mem_st: memory hotplug state
 198  * @dev: device
 199  * @errp: set in case of an error
 200  *
 201  * Obtain a single memory slot status.
 202  *
 203  * This function will be called by memory unplug request cb and unplug cb.
 204  */
 205 static MemStatus *
 206 acpi_memory_slot_status(MemHotplugState *mem_st,
 207                         DeviceState *dev, Error **errp)
 208 {
 209     Error *local_err = NULL;
 210     int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP,
 211                                        &local_err);
 212
 213     if (local_err) {
 214         error_propagate(errp, local_err);
 215         return NULL;
 216     }
 217
 218     if (slot >= mem_st->dev_count) {
 219         char *dev_path = object_get_canonical_path(OBJECT(dev));
 220         error_setg(errp, "acpi_memory_slot_status: "
 221                    "device [%s] returned invalid memory slot[%d]",
 222                     dev_path, slot);
 223         g_free(dev_path);
 224         return NULL;
 225     }
 226
 227     return &mem_st->devs[slot];
 228 }
 229
 230 void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
 231                          DeviceState *dev, Error **errp)
 232 {
 233     MemStatus *mdev;
 234     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 235
 236     if (!dc->hotpluggable) {
 237         return;
 238     }
 239
 240     mdev = acpi_memory_slot_status(mem_st, dev, errp);
 241     if (!mdev) {
 242         return;
 243     }
 244
 245     mdev->dimm = dev;
 246     mdev->is_enabled = true;
 247     if (dev->hotplugged) {
 248         mdev->is_inserting = true;
 249
 250         /* do ACPI magic */
 251         acpi_send_gpe_event(ar, irq, ACPI_MEMORY_HOTPLUG_STATUS);
 252     }
 253     return;
 254 }
 255
 256 void acpi_memory_unplug_request_cb(ACPIREGS *ar, qemu_irq irq,
 257                                    MemHotplugState *mem_st,
 258                                    DeviceState *dev, Error **errp)
 259 {
 260     MemStatus *mdev;
 261
 262     mdev = acpi_memory_slot_status(mem_st, dev, errp);
 263     if (!mdev) {
 264         return;
 265     }
 266
 267     mdev->is_removing = true;
 268
 269     /* Do ACPI magic */
 270     acpi_send_gpe_event(ar, irq, ACPI_MEMORY_HOTPLUG_STATUS);
 271 }
 272
 273 void acpi_memory_unplug_cb(MemHotplugState *mem_st,
 274                            DeviceState *dev, Error **errp)
 275 {
 276     MemStatus *mdev;
 277
 278     mdev = acpi_memory_slot_status(mem_st, dev, errp);
 279     if (!mdev) {
 280         return;
 281     }
 282
 283     mdev->is_enabled = false;
 284     mdev->dimm = NULL;
 285 }
 286
 287 static const VMStateDescription vmstate_memhp_sts = {
 288     .name = "memory hotplug device state",
 289     .version_id = 1,
 290     .minimum_version_id = 1,
 291     .minimum_version_id_old = 1,
 292     .fields      = (VMStateField[]) {
 293         VMSTATE_BOOL(is_enabled, MemStatus),
 294         VMSTATE_BOOL(is_inserting, MemStatus),
 295         VMSTATE_UINT32(ost_event, MemStatus),
 296         VMSTATE_UINT32(ost_status, MemStatus),
 297         VMSTATE_END_OF_LIST()
 298     }
 299 };
 300
 301 const VMStateDescription vmstate_memory_hotplug = {
 302     .name = "memory hotplug state",
 303     .version_id = 1,
 304     .minimum_version_id = 1,
 305     .minimum_version_id_old = 1,
 306     .fields      = (VMStateField[]) {
 307         VMSTATE_UINT32(selector, MemHotplugState),
 308         VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, MemHotplugState, dev_count,
 309                                              vmstate_memhp_sts, MemStatus),
 310         VMSTATE_END_OF_LIST()
 311     }
 312 };