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-rw-r--r--hw/mem/pc-dimm.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
new file mode 100644
index 0000000000..ad176b700b
--- /dev/null
+++ b/hw/mem/pc-dimm.c
@@ -0,0 +1,281 @@
+/*
+ * Dimm device for Memory Hotplug
+ *
+ * Copyright ProfitBricks GmbH 2012
+ * Copyright (C) 2014 Red Hat Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "hw/mem/pc-dimm.h"
+#include "qemu/config-file.h"
+#include "qapi/visitor.h"
+#include "qemu/range.h"
+
+int qmp_pc_dimm_device_list(Object *obj, void *opaque)
+{
+ MemoryDeviceInfoList ***prev = opaque;
+
+ if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
+ DeviceState *dev = DEVICE(obj);
+
+ if (dev->realized) {
+ MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
+ MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
+ PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
+ DeviceClass *dc = DEVICE_GET_CLASS(obj);
+ PCDIMMDevice *dimm = PC_DIMM(obj);
+
+ if (dev->id) {
+ di->has_id = true;
+ di->id = g_strdup(dev->id);
+ }
+ di->hotplugged = dev->hotplugged;
+ di->hotpluggable = dc->hotpluggable;
+ di->addr = dimm->addr;
+ di->slot = dimm->slot;
+ di->node = dimm->node;
+ di->size = object_property_get_int(OBJECT(dimm), PC_DIMM_SIZE_PROP,
+ NULL);
+ di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
+
+ info->dimm = di;
+ elem->value = info;
+ elem->next = NULL;
+ **prev = elem;
+ *prev = &elem->next;
+ }
+ }
+
+ object_child_foreach(obj, qmp_pc_dimm_device_list, opaque);
+ return 0;
+}
+
+static int pc_dimm_slot2bitmap(Object *obj, void *opaque)
+{
+ unsigned long *bitmap = opaque;
+
+ if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
+ DeviceState *dev = DEVICE(obj);
+ if (dev->realized) { /* count only realized DIMMs */
+ PCDIMMDevice *d = PC_DIMM(obj);
+ set_bit(d->slot, bitmap);
+ }
+ }
+
+ object_child_foreach(obj, pc_dimm_slot2bitmap, opaque);
+ return 0;
+}
+
+int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp)
+{
+ unsigned long *bitmap = bitmap_new(max_slots);
+ int slot = 0;
+
+ object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap);
+
+ /* check if requested slot is not occupied */
+ if (hint) {
+ if (*hint >= max_slots) {
+ error_setg(errp, "invalid slot# %d, should be less than %d",
+ *hint, max_slots);
+ } else if (!test_bit(*hint, bitmap)) {
+ slot = *hint;
+ } else {
+ error_setg(errp, "slot %d is busy", *hint);
+ }
+ goto out;
+ }
+
+ /* search for free slot */
+ slot = find_first_zero_bit(bitmap, max_slots);
+ if (slot == max_slots) {
+ error_setg(errp, "no free slots available");
+ }
+out:
+ g_free(bitmap);
+ return slot;
+}
+
+static gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b)
+{
+ PCDIMMDevice *x = PC_DIMM(a);
+ PCDIMMDevice *y = PC_DIMM(b);
+ Int128 diff = int128_sub(int128_make64(x->addr), int128_make64(y->addr));
+
+ if (int128_lt(diff, int128_zero())) {
+ return -1;
+ } else if (int128_gt(diff, int128_zero())) {
+ return 1;
+ }
+ return 0;
+}
+
+static int pc_dimm_built_list(Object *obj, void *opaque)
+{
+ GSList **list = opaque;
+
+ if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
+ DeviceState *dev = DEVICE(obj);
+ if (dev->realized) { /* only realized DIMMs matter */
+ *list = g_slist_insert_sorted(*list, dev, pc_dimm_addr_sort);
+ }
+ }
+
+ object_child_foreach(obj, pc_dimm_built_list, opaque);
+ return 0;
+}
+
+uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
+ uint64_t address_space_size,
+ uint64_t *hint, uint64_t size,
+ Error **errp)
+{
+ GSList *list = NULL, *item;
+ uint64_t new_addr, ret = 0;
+ uint64_t address_space_end = address_space_start + address_space_size;
+
+ assert(address_space_end > address_space_size);
+ object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &list);
+
+ if (hint) {
+ new_addr = *hint;
+ } else {
+ new_addr = address_space_start;
+ }
+
+ /* find address range that will fit new DIMM */
+ for (item = list; item; item = g_slist_next(item)) {
+ PCDIMMDevice *dimm = item->data;
+ uint64_t dimm_size = object_property_get_int(OBJECT(dimm),
+ PC_DIMM_SIZE_PROP,
+ errp);
+ if (errp && *errp) {
+ goto out;
+ }
+
+ if (ranges_overlap(dimm->addr, dimm_size, new_addr, size)) {
+ if (hint) {
+ DeviceState *d = DEVICE(dimm);
+ error_setg(errp, "address range conflicts with '%s'", d->id);
+ goto out;
+ }
+ new_addr = dimm->addr + dimm_size;
+ }
+ }
+ ret = new_addr;
+
+ if (new_addr < address_space_start) {
+ error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
+ "] at 0x%" PRIx64, new_addr, size, address_space_start);
+ } else if ((new_addr + size) > address_space_end) {
+ error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
+ "] beyond 0x%" PRIx64, new_addr, size, address_space_end);
+ }
+
+out:
+ g_slist_free(list);
+ return ret;
+}
+
+static Property pc_dimm_properties[] = {
+ DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),
+ DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0),
+ DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot,
+ PC_DIMM_UNASSIGNED_SLOT),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pc_dimm_get_size(Object *obj, Visitor *v, void *opaque,
+ const char *name, Error **errp)
+{
+ int64_t value;
+ MemoryRegion *mr;
+ PCDIMMDevice *dimm = PC_DIMM(obj);
+
+ mr = host_memory_backend_get_memory(dimm->hostmem, errp);
+ value = memory_region_size(mr);
+
+ visit_type_int(v, &value, name, errp);
+}
+
+static void pc_dimm_check_memdev_is_busy(Object *obj, const char *name,
+ Object *val, Error **errp)
+{
+ MemoryRegion *mr;
+
+ mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp);
+ if (memory_region_is_mapped(mr)) {
+ char *path = object_get_canonical_path_component(val);
+ error_setg(errp, "can't use already busy memdev: %s", path);
+ g_free(path);
+ } else {
+ qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
+ }
+}
+
+static void pc_dimm_init(Object *obj)
+{
+ PCDIMMDevice *dimm = PC_DIMM(obj);
+
+ object_property_add(obj, PC_DIMM_SIZE_PROP, "int", pc_dimm_get_size,
+ NULL, NULL, NULL, &error_abort);
+ object_property_add_link(obj, PC_DIMM_MEMDEV_PROP, TYPE_MEMORY_BACKEND,
+ (Object **)&dimm->hostmem,
+ pc_dimm_check_memdev_is_busy,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &error_abort);
+}
+
+static void pc_dimm_realize(DeviceState *dev, Error **errp)
+{
+ PCDIMMDevice *dimm = PC_DIMM(dev);
+
+ if (!dimm->hostmem) {
+ error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set");
+ return;
+ }
+}
+
+static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm)
+{
+ return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
+}
+
+static void pc_dimm_class_init(ObjectClass *oc, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(oc);
+ PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
+
+ dc->realize = pc_dimm_realize;
+ dc->props = pc_dimm_properties;
+
+ ddc->get_memory_region = pc_dimm_get_memory_region;
+}
+
+static TypeInfo pc_dimm_info = {
+ .name = TYPE_PC_DIMM,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(PCDIMMDevice),
+ .instance_init = pc_dimm_init,
+ .class_init = pc_dimm_class_init,
+ .class_size = sizeof(PCDIMMDeviceClass),
+};
+
+static void pc_dimm_register_types(void)
+{
+ type_register_static(&pc_dimm_info);
+}
+
+type_init(pc_dimm_register_types)
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