hw/acpi/memory_hotplug.c

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