diff options
Diffstat (limited to 'hw/mem/nvdimm.c')
-rw-r--r-- | hw/mem/nvdimm.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c index 0a602f28ba..81896c0e84 100644 --- a/hw/mem/nvdimm.c +++ b/hw/mem/nvdimm.c @@ -23,20 +23,152 @@ */ #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) +{ + 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); + 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) { DeviceClass *dc = DEVICE_CLASS(oc); + PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); + NVDIMMClass *nvc = NVDIMM_CLASS(oc); /* nvdimm hotplug has not been supported yet. */ dc->hotpluggable = false; + + 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) |