acpi: memory hotplug ACPI hardware implementation
- implements QEMU hardware part of memory hotplug protocol
described at "docs/specs/acpi_mem_hotplug.txt"
- handles only memory add notification event for now
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
new file mode 100644
index 0000000..e3a13ed
--- /dev/null
+++ b/hw/acpi/memory_hotplug.c
@@ -0,0 +1,147 @@
+#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;
+}
