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#include "hw/acpi/memory_hotplug.h"
#include "hw/acpi/pc-hotplug.h"
#include "hw/mem/pc-dimm.h"
#include "hw/boards.h"
static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr,
unsigned int size)
{
uint32_t val = 0;
MemHotplugState *mem_st = opaque;
MemStatus *mdev;
Object *o;
if (mem_st->selector >= mem_st->dev_count) {
return 0;
}
mdev = &mem_st->devs[mem_st->selector];
o = OBJECT(mdev->dimm);
switch (addr) {
case 0x0: /* Lo part of phys address where DIMM is mapped */
val = o ? object_property_get_int(o, PC_DIMM_ADDR_PROP, NULL) : 0;
break;
case 0x4: /* Hi part of phys address where DIMM is mapped */
val = o ? object_property_get_int(o, PC_DIMM_ADDR_PROP, NULL) >> 32 : 0;
break;
case 0x8: /* Lo part of DIMM size */
val = o ? object_property_get_int(o, PC_DIMM_SIZE_PROP, NULL) : 0;
break;
case 0xc: /* Hi part of DIMM size */
val = o ? object_property_get_int(o, PC_DIMM_SIZE_PROP, NULL) >> 32 : 0;
break;
case 0x10: /* node proximity for _PXM method */
val = o ? object_property_get_int(o, PC_DIMM_NODE_PROP, NULL) : 0;
break;
case 0x14: /* pack and return is_* fields */
val |= mdev->is_enabled ? 1 : 0;
val |= mdev->is_inserting ? 2 : 0;
break;
default:
val = ~0;
break;
}
return val;
}
static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
MemHotplugState *mem_st = opaque;
MemStatus *mdev;
if (!mem_st->dev_count) {
return;
}
if (addr) {
if (mem_st->selector >= mem_st->dev_count) {
return;
}
}
switch (addr) {
case 0x0: /* DIMM slot selector */
mem_st->selector = data;
break;
case 0x4: /* _OST event */
mdev = &mem_st->devs[mem_st->selector];
if (data == 1) {
/* TODO: handle device insert OST event */
} else if (data == 3) {
/* TODO: handle device remove OST event */
}
mdev->ost_event = data;
break;
case 0x8: /* _OST status */
mdev = &mem_st->devs[mem_st->selector];
mdev->ost_status = data;
/* TODO: report async error */
/* TODO: implement memory removal on guest signal */
break;
case 0x14:
mdev = &mem_st->devs[mem_st->selector];
if (data & 2) { /* clear insert event */
mdev->is_inserting = false;
}
break;
}
}
static const MemoryRegionOps acpi_memory_hotplug_ops = {
.read = acpi_memory_hotplug_read,
.write = acpi_memory_hotplug_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
MemHotplugState *state)
{
MachineState *machine = MACHINE(qdev_get_machine());
state->dev_count = machine->ram_slots;
if (!state->dev_count) {
return;
}
state->devs = g_malloc0(sizeof(*state->devs) * state->dev_count);
memory_region_init_io(&state->io, owner, &acpi_memory_hotplug_ops, state,
"apci-mem-hotplug", ACPI_MEMORY_HOTPLUG_IO_LEN);
memory_region_add_subregion(as, ACPI_MEMORY_HOTPLUG_BASE, &state->io);
}
void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
DeviceState *dev, Error **errp)
{
MemStatus *mdev;
Error *local_err = NULL;
int slot = object_property_get_int(OBJECT(dev), "slot", &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (slot >= mem_st->dev_count) {
char *dev_path = object_get_canonical_path(OBJECT(dev));
error_setg(errp, "acpi_memory_plug_cb: "
"device [%s] returned invalid memory slot[%d]",
dev_path, slot);
g_free(dev_path);
return;
}
mdev = &mem_st->devs[slot];
mdev->dimm = dev;
mdev->is_enabled = true;
mdev->is_inserting = true;
/* do ACPI magic */
ar->gpe.sts[0] |= ACPI_MEMORY_HOTPLUG_STATUS;
acpi_update_sci(ar, irq);
return;
}
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