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>
This commit is contained in:
Xiao Guangrong 2016-06-07 20:21:58 +08:00 committed by Michael S. Tsirkin
parent 8df1426e44
commit d6fb213a62
2 changed files with 186 additions and 1 deletions

View File

@ -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)

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@ -34,7 +34,60 @@
} \
} while (0)
#define TYPE_NVDIMM "nvdimm"
/*
* The minimum label data size is required by NVDIMM Namespace
* specification, see the chapter 2 Namespaces:
* "NVDIMMs following the NVDIMM Block Mode Specification use an area
* at least 128KB in size, which holds around 1000 labels."
*/
#define MIN_NAMESPACE_LABEL_SIZE (128UL << 10)
#define TYPE_NVDIMM "nvdimm"
#define NVDIMM(obj) OBJECT_CHECK(NVDIMMDevice, (obj), TYPE_NVDIMM)
#define NVDIMM_CLASS(oc) OBJECT_CLASS_CHECK(NVDIMMClass, (oc), TYPE_NVDIMM)
#define NVDIMM_GET_CLASS(obj) OBJECT_GET_CLASS(NVDIMMClass, (obj), \
TYPE_NVDIMM)
struct NVDIMMDevice {
/* private */
PCDIMMDevice parent_obj;
/* public */
/*
* the size of label data in NVDIMM device which is presented to
* guest via __DSM "Get Namespace Label Size" function.
*/
uint64_t label_size;
/*
* the address of label data which is read by __DSM "Get Namespace
* Label Data" function and written by __DSM "Set Namespace Label
* Data" function.
*/
void *label_data;
/*
* it's the PMEM region in NVDIMM device, which is presented to
* guest via ACPI NFIT and _FIT method if NVDIMM hotplug is supported.
*/
MemoryRegion nvdimm_mr;
};
typedef struct NVDIMMDevice NVDIMMDevice;
struct NVDIMMClass {
/* private */
PCDIMMDeviceClass parent_class;
/* public */
/* read @size bytes from NVDIMM label data at @offset into @buf. */
void (*read_label_data)(NVDIMMDevice *nvdimm, void *buf,
uint64_t size, uint64_t offset);
/* write @size bytes from @buf to NVDIMM label data at @offset. */
void (*write_label_data)(NVDIMMDevice *nvdimm, const void *buf,
uint64_t size, uint64_t offset);
};
typedef struct NVDIMMClass NVDIMMClass;
#define NVDIMM_DSM_MEM_FILE "etc/acpi/nvdimm-mem"