* License along with this library; if not, see <http://www.gnu.org/licenses/>
*/
+#include "qemu/osdep.h"
+#include "qemu/module.h"
+#include "qemu/pmem.h"
+#include "qapi/error.h"
+#include "qapi/visitor.h"
#include "hw/mem/nvdimm.h"
+#include "hw/qdev-properties.h"
+#include "hw/mem/memory-device.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 (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, NVDIMM_LABEL_SIZE_PROP, "int",
+ nvdimm_get_label_size, nvdimm_set_label_size, NULL,
+ NULL, NULL);
+}
+
+static void nvdimm_finalize(Object *obj)
+{
+ NVDIMMDevice *nvdimm = NVDIMM(obj);
+
+ g_free(nvdimm->nvdimm_mr);
+}
+
+static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
+{
+ PCDIMMDevice *dimm = PC_DIMM(nvdimm);
+ uint64_t align, pmem_size, size;
+ MemoryRegion *mr;
+
+ g_assert(!nvdimm->nvdimm_mr);
+
+ if (!dimm->hostmem) {
+ error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
+ return;
+ }
+
+ mr = host_memory_backend_get_memory(dimm->hostmem);
+ align = memory_region_get_alignment(mr);
+ size = memory_region_size(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;
+ }
+
+ nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
+ memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
+ "nvdimm-memory", mr, 0, pmem_size);
+ memory_region_set_nonvolatile(nvdimm->nvdimm_mr, true);
+ nvdimm->nvdimm_mr->align = align;
+}
+
+static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md,
+ Error **errp)
+{
+ NVDIMMDevice *nvdimm = NVDIMM(md);
+ Error *local_err = NULL;
+
+ if (!nvdimm->nvdimm_mr) {
+ nvdimm_prepare_memory_region(nvdimm, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return NULL;
+ }
+ }
+ return nvdimm->nvdimm_mr;
+}
+
+static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
+{
+ NVDIMMDevice *nvdimm = NVDIMM(dimm);
+
+ if (!nvdimm->nvdimm_mr) {
+ nvdimm_prepare_memory_region(nvdimm, errp);
+ }
+}
+
+/*
+ * 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);
+ bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
+ "pmem", NULL);
+ uint64_t backend_offset;
+
+ nvdimm_validate_rw_label_data(nvdimm, size, offset);
+
+ if (!is_pmem) {
+ memcpy(nvdimm->label_data + offset, buf, size);
+ } else {
+ pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
+ }
+
+ mr = host_memory_backend_get_memory(dimm->hostmem);
+ backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
+ memory_region_set_dirty(mr, backend_offset, size);
+}
+
+static Property nvdimm_properties[] = {
+ DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
+ DEFINE_PROP_END_OF_LIST(),
+};
static void nvdimm_class_init(ObjectClass *oc, void *data)
{
+ PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
+ MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
+ NVDIMMClass *nvc = NVDIMM_CLASS(oc);
DeviceClass *dc = DEVICE_CLASS(oc);
- /* nvdimm hotplug has not been supported yet. */
- dc->hotpluggable = false;
+ ddc->realize = nvdimm_realize;
+ mdc->get_memory_region = nvdimm_md_get_memory_region;
+ dc->props = nvdimm_properties;
+
+ 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,
+ .instance_finalize = nvdimm_finalize,
};
static void nvdimm_register_types(void)
projects / qemu.git / blobdiff