X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Fhw%2Fmem%2Fpc-dimm.c;fp=qemu%2Fhw%2Fmem%2Fpc-dimm.c;h=bb04862de8e812a564ecdff504c08746fd516dd6;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/hw/mem/pc-dimm.c b/qemu/hw/mem/pc-dimm.c
new file mode 100644
index 000000000..bb04862de
--- /dev/null
+++ b/qemu/hw/mem/pc-dimm.c
@@ -0,0 +1,456 @@
+/*
+ * 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"
+#include "sysemu/numa.h"
+#include "sysemu/kvm.h"
+#include "trace.h"
+
+typedef struct pc_dimms_capacity {
+     uint64_t size;
+     Error    **errp;
+} pc_dimms_capacity;
+
+void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState *hpms,
+                         MemoryRegion *mr, uint64_t align, Error **errp)
+{
+    int slot;
+    MachineState *machine = MACHINE(qdev_get_machine());
+    PCDIMMDevice *dimm = PC_DIMM(dev);
+    Error *local_err = NULL;
+    uint64_t existing_dimms_capacity = 0;
+    uint64_t addr;
+
+    addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    addr = pc_dimm_get_free_addr(hpms->base,
+                                 memory_region_size(&hpms->mr),
+                                 !addr ? NULL : &addr, align,
+                                 memory_region_size(mr), &local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    existing_dimms_capacity = pc_existing_dimms_capacity(&local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    if (existing_dimms_capacity + memory_region_size(mr) >
+        machine->maxram_size - machine->ram_size) {
+        error_setg(&local_err, "not enough space, currently 0x%" PRIx64
+                   " in use of total hot pluggable 0x" RAM_ADDR_FMT,
+                   existing_dimms_capacity,
+                   machine->maxram_size - machine->ram_size);
+        goto out;
+    }
+
+    object_property_set_int(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err);
+    if (local_err) {
+        goto out;
+    }
+    trace_mhp_pc_dimm_assigned_address(addr);
+
+    slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP, &local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot,
+                                 machine->ram_slots, &local_err);
+    if (local_err) {
+        goto out;
+    }
+    object_property_set_int(OBJECT(dev), slot, PC_DIMM_SLOT_PROP, &local_err);
+    if (local_err) {
+        goto out;
+    }
+    trace_mhp_pc_dimm_assigned_slot(slot);
+
+    if (kvm_enabled() && !kvm_has_free_slot(machine)) {
+        error_setg(&local_err, "hypervisor has no free memory slots left");
+        goto out;
+    }
+
+    memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr);
+    vmstate_register_ram(mr, dev);
+    numa_set_mem_node_id(addr, memory_region_size(mr), dimm->node);
+
+out:
+    error_propagate(errp, local_err);
+}
+
+void pc_dimm_memory_unplug(DeviceState *dev, MemoryHotplugState *hpms,
+                           MemoryRegion *mr)
+{
+    PCDIMMDevice *dimm = PC_DIMM(dev);
+
+    numa_unset_mem_node_id(dimm->addr, memory_region_size(mr), dimm->node);
+    memory_region_del_subregion(&hpms->mr, mr);
+    vmstate_unregister_ram(mr, dev);
+}
+
+static int pc_existing_dimms_capacity_internal(Object *obj, void *opaque)
+{
+    pc_dimms_capacity *cap = opaque;
+    uint64_t *size = &cap->size;
+
+    if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
+        DeviceState *dev = DEVICE(obj);
+
+        if (dev->realized) {
+            (*size) += object_property_get_int(obj, PC_DIMM_SIZE_PROP,
+                cap->errp);
+        }
+
+        if (cap->errp && *cap->errp) {
+            return 1;
+        }
+    }
+    object_child_foreach(obj, pc_existing_dimms_capacity_internal, opaque);
+    return 0;
+}
+
+uint64_t pc_existing_dimms_capacity(Error **errp)
+{
+    pc_dimms_capacity cap;
+
+    cap.size = 0;
+    cap.errp = errp;
+
+    pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap);
+    return cap.size;
+}
+
+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;
+}
+
+ram_addr_t get_current_ram_size(void)
+{
+    MemoryDeviceInfoList *info_list = NULL;
+    MemoryDeviceInfoList **prev = &info_list;
+    MemoryDeviceInfoList *info;
+    ram_addr_t size = ram_size;
+
+    qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
+    for (info = info_list; info; info = info->next) {
+        MemoryDeviceInfo *value = info->value;
+
+        if (value) {
+            switch (value->kind) {
+            case MEMORY_DEVICE_INFO_KIND_DIMM:
+                size += value->dimm->size;
+                break;
+            default:
+                break;
+            }
+        }
+    }
+    qapi_free_MemoryDeviceInfoList(info_list);
+
+    return size;
+}
+
+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 align, 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;
+
+    g_assert(QEMU_ALIGN_UP(address_space_start, align) == address_space_start);
+
+    if (!address_space_size) {
+        error_setg(errp, "memory hotplug is not enabled, "
+                         "please add maxmem option");
+        goto out;
+    }
+
+    if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) {
+        error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
+                   align);
+        goto out;
+    }
+
+    if (QEMU_ALIGN_UP(size, align) != size) {
+        error_setg(errp, "backend memory size must be multiple of 0x%"
+                   PRIx64, align);
+        goto out;
+    }
+
+    assert(address_space_end > address_space_start);
+    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 = QEMU_ALIGN_UP(dimm->addr + dimm_size, align);
+        }
+    }
+    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;
+    }
+    if ((nb_numa_nodes > 0) && (dimm->node >= nb_numa_nodes)) {
+        error_setg(errp, "'DIMM property " PC_DIMM_NODE_PROP " has value %"
+                   PRIu32 "' which exceeds the number of numa nodes: %d",
+                   dimm->node, nb_numa_nodes);
+        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;
+    dc->desc = "DIMM memory module";
+
+    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)