/* * Non-Volatile Dual In-line Memory Module Virtualization Implementation * * Copyright(C) 2015 Intel Corporation. * * Author: * Xiao Guangrong <guangrong.xiao@linux.intel.com> * * Currently, it only supports PMEM Virtualization. * * 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 "qemu/osdep.h" #include "qapi/error.h" #include "qapi/visitor.h" #include "hw/mem/nvdimm.h" static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(obj); uint64_t value = nvdimm->label_size; visit_type_size(v, name, &value, errp); } static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(obj); Error *local_err = NULL; uint64_t value; if (memory_region_size(&nvdimm->nvdimm_mr)) { error_setg(&local_err, "cannot change property value"); goto out; } visit_type_size(v, name, &value, &local_err); if (local_err) { goto out; } if (value < MIN_NAMESPACE_LABEL_SIZE) { error_setg(&local_err, "Property '%s.%s' (0x%" PRIx64 ") is required" " at least 0x%lx", object_get_typename(obj), name, value, MIN_NAMESPACE_LABEL_SIZE); goto out; } nvdimm->label_size = value; out: error_propagate(errp, local_err); } static void nvdimm_init(Object *obj) { object_property_add(obj, "label-size", "int", nvdimm_get_label_size, nvdimm_set_label_size, NULL, NULL, NULL); } static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(dimm); return &nvdimm->nvdimm_mr; } static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) { MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem, errp); NVDIMMDevice *nvdimm = NVDIMM(dimm); uint64_t align, pmem_size, size = memory_region_size(mr); align = memory_region_get_alignment(mr); pmem_size = size - nvdimm->label_size; nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size; pmem_size = QEMU_ALIGN_DOWN(pmem_size, align); if (size <= nvdimm->label_size || !pmem_size) { HostMemoryBackend *hostmem = dimm->hostmem; char *path = object_get_canonical_path_component(OBJECT(hostmem)); error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too " "small to contain nvdimm label (0x%" PRIx64 ") and " "aligned PMEM (0x%" PRIx64 ")", path, memory_region_size(mr), nvdimm->label_size, align); g_free(path); return; } memory_region_init_alias(&nvdimm->nvdimm_mr, OBJECT(dimm), "nvdimm-memory", mr, 0, pmem_size); nvdimm->nvdimm_mr.align = align; } /* * the caller should check the input parameters before calling * label read/write functions. */ static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size, uint64_t offset) { assert((nvdimm->label_size >= size + offset) && (offset + size > offset)); } static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf, uint64_t size, uint64_t offset) { nvdimm_validate_rw_label_data(nvdimm, size, offset); memcpy(buf, nvdimm->label_data + offset, size); } static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf, uint64_t size, uint64_t offset) { MemoryRegion *mr; PCDIMMDevice *dimm = PC_DIMM(nvdimm); uint64_t backend_offset; nvdimm_validate_rw_label_data(nvdimm, size, offset); memcpy(nvdimm->label_data + offset, buf, size); mr = host_memory_backend_get_memory(dimm->hostmem, &error_abort); backend_offset = memory_region_size(mr) - nvdimm->label_size + offset; memory_region_set_dirty(mr, backend_offset, size); } static MemoryRegion *nvdimm_get_vmstate_memory_region(PCDIMMDevice *dimm) { return host_memory_backend_get_memory(dimm->hostmem, &error_abort); } static void nvdimm_class_init(ObjectClass *oc, void *data) { PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); NVDIMMClass *nvc = NVDIMM_CLASS(oc); ddc->realize = nvdimm_realize; ddc->get_memory_region = nvdimm_get_memory_region; ddc->get_vmstate_memory_region = nvdimm_get_vmstate_memory_region; nvc->read_label_data = nvdimm_read_label_data; nvc->write_label_data = nvdimm_write_label_data; } static TypeInfo nvdimm_info = { .name = TYPE_NVDIMM, .parent = TYPE_PC_DIMM, .class_size = sizeof(NVDIMMClass), .class_init = nvdimm_class_init, .instance_size = sizeof(NVDIMMDevice), .instance_init = nvdimm_init, }; static void nvdimm_register_types(void) { type_register_static(&nvdimm_info); } type_init(nvdimm_register_types)