/* * Non-Volatile Dual In-line Memory Module Virtualization Implementation * * Copyright(C) 2015 Intel Corporation. * * Author: * Xiao Guangrong * * NVDIMM specifications and some documents can be found at: * NVDIMM ACPI device and NFIT are introduced in ACPI 6: * http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf * NVDIMM Namespace specification: * http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf * DSM Interface Example: * http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf * Driver Writer's Guide: * http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. */ #ifndef QEMU_NVDIMM_H #define QEMU_NVDIMM_H #include "hw/mem/pc-dimm.h" #include "hw/acpi/bios-linker-loader.h" #define NVDIMM_DEBUG 0 #define nvdimm_debug(fmt, ...) \ do { \ if (NVDIMM_DEBUG) { \ fprintf(stderr, "nvdimm: " fmt, ## __VA_ARGS__); \ } \ } while (0) /* * 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) #define NVDIMM_LABEL_SIZE_PROP "label-size" #define NVDIMM_UNARMED_PROP "unarmed" 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; /* * The 'on' value results in the unarmed flag set in ACPI NFIT, * which can be used to notify guest implicitly that the host * backend (e.g., files on HDD, /dev/pmemX, etc.) cannot guarantee * the guest write persistence. */ bool unarmed; }; 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" /* * 32 bits IO port starting from 0x0a18 in guest is reserved for * NVDIMM ACPI emulation. */ #define NVDIMM_ACPI_IO_BASE 0x0a18 #define NVDIMM_ACPI_IO_LEN 4 /* * NvdimmFitBuffer: * @fit: FIT structures for present NVDIMMs. It is updated when * the NVDIMM device is plugged or unplugged. * @dirty: It allows OSPM to detect change and restart read in * progress if there is any. */ struct NvdimmFitBuffer { GArray *fit; bool dirty; }; typedef struct NvdimmFitBuffer NvdimmFitBuffer; struct NVDIMMState { /* detect if NVDIMM support is enabled. */ bool is_enabled; /* the data of the fw_cfg file NVDIMM_DSM_MEM_FILE. */ GArray *dsm_mem; NvdimmFitBuffer fit_buf; /* the IO region used by OSPM to transfer control to QEMU. */ MemoryRegion io_mr; /* * Platform capabilities, section 5.2.25.9 of ACPI 6.2 Errata A */ int32_t persistence; char *persistence_string; }; typedef struct NVDIMMState NVDIMMState; void nvdimm_init_acpi_state(NVDIMMState *state, MemoryRegion *io, FWCfgState *fw_cfg, Object *owner); void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data, BIOSLinker *linker, NVDIMMState *state, uint32_t ram_slots); void nvdimm_plug(NVDIMMState *state); void nvdimm_acpi_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev); #endif