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>

hw/acpi/Makefile.objs

@@ -1 +1,2 @@
 common-obj-$(CONFIG_ACPI) += core.o piix4.o ich9.o pcihp.o cpu_hotplug.o
+common-obj-$(CONFIG_ACPI) += memory_hotplug.o

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;
+}