mirror of https://github.com/proxmox/mirror_qemu
nvdimm: support nvdimm label
Introduce a parameter, 'label-size', which is the size of nvdimm label data area which is reserved at the end of backend memory. It is required at least 128k Two callbacks, read_label_data() and write_label_data(), are used to operate the label area Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>master
Xiao Guangrong
Michael S. Tsirkin
parent
8df1426e44
commit
d6fb213a62
132
hw/mem/nvdimm.c
132
hw/mem/nvdimm.c
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@ -23,20 +23,152 @@
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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#include "hw/mem/nvdimm.h"
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static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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NVDIMMDevice *nvdimm = NVDIMM(obj);
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uint64_t value = nvdimm->label_size;
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visit_type_size(v, name, &value, errp);
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}
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static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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NVDIMMDevice *nvdimm = NVDIMM(obj);
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Error *local_err = NULL;
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uint64_t value;
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if (memory_region_size(&nvdimm->nvdimm_mr)) {
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error_setg(&local_err, "cannot change property value");
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goto out;
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}
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visit_type_size(v, name, &value, &local_err);
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if (local_err) {
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goto out;
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}
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if (value < MIN_NAMESPACE_LABEL_SIZE) {
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error_setg(&local_err, "Property '%s.%s' (0x%" PRIx64 ") is required"
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" at least 0x%lx", object_get_typename(obj),
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name, value, MIN_NAMESPACE_LABEL_SIZE);
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goto out;
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}
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nvdimm->label_size = value;
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out:
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error_propagate(errp, local_err);
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}
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static void nvdimm_init(Object *obj)
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{
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object_property_add(obj, "label-size", "int",
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nvdimm_get_label_size, nvdimm_set_label_size, NULL,
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NULL, NULL);
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}
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static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm)
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{
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NVDIMMDevice *nvdimm = NVDIMM(dimm);
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return &nvdimm->nvdimm_mr;
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}
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static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
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{
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MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem, errp);
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NVDIMMDevice *nvdimm = NVDIMM(dimm);
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uint64_t align, pmem_size, size = memory_region_size(mr);
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align = memory_region_get_alignment(mr);
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pmem_size = size - nvdimm->label_size;
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nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
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pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
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if (size <= nvdimm->label_size || !pmem_size) {
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HostMemoryBackend *hostmem = dimm->hostmem;
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char *path = object_get_canonical_path_component(OBJECT(hostmem));
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error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
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"small to contain nvdimm label (0x%" PRIx64 ") and "
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"aligned PMEM (0x%" PRIx64 ")",
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path, memory_region_size(mr), nvdimm->label_size, align);
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return;
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}
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memory_region_init_alias(&nvdimm->nvdimm_mr, OBJECT(dimm),
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"nvdimm-memory", mr, 0, pmem_size);
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nvdimm->nvdimm_mr.align = align;
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}
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/*
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* the caller should check the input parameters before calling
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* label read/write functions.
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*/
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static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
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uint64_t offset)
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{
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assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
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}
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static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
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uint64_t size, uint64_t offset)
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{
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nvdimm_validate_rw_label_data(nvdimm, size, offset);
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memcpy(buf, nvdimm->label_data + offset, size);
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}
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static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
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uint64_t size, uint64_t offset)
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{
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MemoryRegion *mr;
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PCDIMMDevice *dimm = PC_DIMM(nvdimm);
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uint64_t backend_offset;
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nvdimm_validate_rw_label_data(nvdimm, size, offset);
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memcpy(nvdimm->label_data + offset, buf, size);
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mr = host_memory_backend_get_memory(dimm->hostmem, &error_abort);
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backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
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memory_region_set_dirty(mr, backend_offset, size);
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}
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static MemoryRegion *nvdimm_get_vmstate_memory_region(PCDIMMDevice *dimm)
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{
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return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
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}
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static void nvdimm_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
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NVDIMMClass *nvc = NVDIMM_CLASS(oc);
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/* nvdimm hotplug has not been supported yet. */
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dc->hotpluggable = false;
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ddc->realize = nvdimm_realize;
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ddc->get_memory_region = nvdimm_get_memory_region;
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ddc->get_vmstate_memory_region = nvdimm_get_vmstate_memory_region;
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nvc->read_label_data = nvdimm_read_label_data;
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nvc->write_label_data = nvdimm_write_label_data;
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}
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static TypeInfo nvdimm_info = {
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.name = TYPE_NVDIMM,
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.parent = TYPE_PC_DIMM,
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.class_size = sizeof(NVDIMMClass),
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.class_init = nvdimm_class_init,
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.instance_size = sizeof(NVDIMMDevice),
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.instance_init = nvdimm_init,
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};
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static void nvdimm_register_types(void)
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@ -34,7 +34,60 @@
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} \
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} while (0)
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#define TYPE_NVDIMM "nvdimm"
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/*
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* The minimum label data size is required by NVDIMM Namespace
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* specification, see the chapter 2 Namespaces:
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* "NVDIMMs following the NVDIMM Block Mode Specification use an area
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* at least 128KB in size, which holds around 1000 labels."
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*/
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#define MIN_NAMESPACE_LABEL_SIZE (128UL << 10)
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#define TYPE_NVDIMM "nvdimm"
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#define NVDIMM(obj) OBJECT_CHECK(NVDIMMDevice, (obj), TYPE_NVDIMM)
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#define NVDIMM_CLASS(oc) OBJECT_CLASS_CHECK(NVDIMMClass, (oc), TYPE_NVDIMM)
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#define NVDIMM_GET_CLASS(obj) OBJECT_GET_CLASS(NVDIMMClass, (obj), \
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TYPE_NVDIMM)
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struct NVDIMMDevice {
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/* private */
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PCDIMMDevice parent_obj;
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/* public */
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/*
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* the size of label data in NVDIMM device which is presented to
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* guest via __DSM "Get Namespace Label Size" function.
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*/
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uint64_t label_size;
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/*
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* the address of label data which is read by __DSM "Get Namespace
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* Label Data" function and written by __DSM "Set Namespace Label
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* Data" function.
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*/
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void *label_data;
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/*
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* it's the PMEM region in NVDIMM device, which is presented to
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* guest via ACPI NFIT and _FIT method if NVDIMM hotplug is supported.
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*/
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MemoryRegion nvdimm_mr;
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};
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typedef struct NVDIMMDevice NVDIMMDevice;
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struct NVDIMMClass {
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/* private */
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PCDIMMDeviceClass parent_class;
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/* public */
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/* read @size bytes from NVDIMM label data at @offset into @buf. */
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void (*read_label_data)(NVDIMMDevice *nvdimm, void *buf,
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uint64_t size, uint64_t offset);
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/* write @size bytes from @buf to NVDIMM label data at @offset. */
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void (*write_label_data)(NVDIMMDevice *nvdimm, const void *buf,
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uint64_t size, uint64_t offset);
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};
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typedef struct NVDIMMClass NVDIMMClass;
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#define NVDIMM_DSM_MEM_FILE "etc/acpi/nvdimm-mem"
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