1 /* 2 * Non-Volatile Dual In-line Memory Module Virtualization Implementation 3 * 4 * Copyright(C) 2015 Intel Corporation. 5 * 6 * Author: 7 * Xiao Guangrong <guangrong.xiao@linux.intel.com> 8 * 9 * NVDIMM specifications and some documents can be found at: 10 * NVDIMM ACPI device and NFIT are introduced in ACPI 6: 11 * http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf 12 * NVDIMM Namespace specification: 13 * http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf 14 * DSM Interface Example: 15 * http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf 16 * Driver Writer's Guide: 17 * http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf 18 * 19 * This work is licensed under the terms of the GNU GPL, version 2 or later. 20 * See the COPYING file in the top-level directory. 21 */ 22 23 #ifndef QEMU_NVDIMM_H 24 #define QEMU_NVDIMM_H 25 26 #include "hw/mem/pc-dimm.h" 27 #include "hw/acpi/bios-linker-loader.h" 28 #include "qemu/uuid.h" 29 #include "hw/acpi/aml-build.h" 30 31 #define NVDIMM_DEBUG 0 32 #define nvdimm_debug(fmt, ...) \ 33 do { \ 34 if (NVDIMM_DEBUG) { \ 35 fprintf(stderr, "nvdimm: " fmt, ## __VA_ARGS__); \ 36 } \ 37 } while (0) 38 39 /* 40 * The minimum label data size is required by NVDIMM Namespace 41 * specification, see the chapter 2 Namespaces: 42 * "NVDIMMs following the NVDIMM Block Mode Specification use an area 43 * at least 128KB in size, which holds around 1000 labels." 44 */ 45 #define MIN_NAMESPACE_LABEL_SIZE (128UL << 10) 46 47 #define TYPE_NVDIMM "nvdimm" 48 #define NVDIMM(obj) OBJECT_CHECK(NVDIMMDevice, (obj), TYPE_NVDIMM) 49 #define NVDIMM_CLASS(oc) OBJECT_CLASS_CHECK(NVDIMMClass, (oc), TYPE_NVDIMM) 50 #define NVDIMM_GET_CLASS(obj) OBJECT_GET_CLASS(NVDIMMClass, (obj), \ 51 TYPE_NVDIMM) 52 53 #define NVDIMM_LABEL_SIZE_PROP "label-size" 54 #define NVDIMM_UUID_PROP "uuid" 55 #define NVDIMM_UNARMED_PROP "unarmed" 56 57 struct NVDIMMDevice { 58 /* private */ 59 PCDIMMDevice parent_obj; 60 61 /* public */ 62 63 /* 64 * the size of label data in NVDIMM device which is presented to 65 * guest via __DSM "Get Namespace Label Size" function. 66 */ 67 uint64_t label_size; 68 69 /* 70 * the address of label data which is read by __DSM "Get Namespace 71 * Label Data" function and written by __DSM "Set Namespace Label 72 * Data" function. 73 */ 74 void *label_data; 75 76 /* 77 * it's the PMEM region in NVDIMM device, which is presented to 78 * guest via ACPI NFIT and _FIT method if NVDIMM hotplug is supported. 79 */ 80 MemoryRegion *nvdimm_mr; 81 82 /* 83 * The 'on' value results in the unarmed flag set in ACPI NFIT, 84 * which can be used to notify guest implicitly that the host 85 * backend (e.g., files on HDD, /dev/pmemX, etc.) cannot guarantee 86 * the guest write persistence. 87 */ 88 bool unarmed; 89 90 /* 91 * The PPC64 - spapr requires each nvdimm device have a uuid. 92 */ 93 QemuUUID uuid; 94 }; 95 typedef struct NVDIMMDevice NVDIMMDevice; 96 97 struct NVDIMMClass { 98 /* private */ 99 PCDIMMDeviceClass parent_class; 100 101 /* public */ 102 103 /* read @size bytes from NVDIMM label data at @offset into @buf. */ 104 void (*read_label_data)(NVDIMMDevice *nvdimm, void *buf, 105 uint64_t size, uint64_t offset); 106 /* write @size bytes from @buf to NVDIMM label data at @offset. */ 107 void (*write_label_data)(NVDIMMDevice *nvdimm, const void *buf, 108 uint64_t size, uint64_t offset); 109 }; 110 typedef struct NVDIMMClass NVDIMMClass; 111 112 #define NVDIMM_DSM_MEM_FILE "etc/acpi/nvdimm-mem" 113 114 /* 115 * 32 bits IO port starting from 0x0a18 in guest is reserved for 116 * NVDIMM ACPI emulation. 117 */ 118 #define NVDIMM_ACPI_IO_BASE 0x0a18 119 #define NVDIMM_ACPI_IO_LEN 4 120 121 /* 122 * NvdimmFitBuffer: 123 * @fit: FIT structures for present NVDIMMs. It is updated when 124 * the NVDIMM device is plugged or unplugged. 125 * @dirty: It allows OSPM to detect change and restart read in 126 * progress if there is any. 127 */ 128 struct NvdimmFitBuffer { 129 GArray *fit; 130 bool dirty; 131 }; 132 typedef struct NvdimmFitBuffer NvdimmFitBuffer; 133 134 struct NVDIMMState { 135 /* detect if NVDIMM support is enabled. */ 136 bool is_enabled; 137 138 /* the data of the fw_cfg file NVDIMM_DSM_MEM_FILE. */ 139 GArray *dsm_mem; 140 141 NvdimmFitBuffer fit_buf; 142 143 /* the IO region used by OSPM to transfer control to QEMU. */ 144 MemoryRegion io_mr; 145 146 /* 147 * Platform capabilities, section 5.2.25.9 of ACPI 6.2 Errata A 148 */ 149 int32_t persistence; 150 char *persistence_string; 151 struct AcpiGenericAddress dsm_io; 152 }; 153 typedef struct NVDIMMState NVDIMMState; 154 155 void nvdimm_init_acpi_state(NVDIMMState *state, MemoryRegion *io, 156 struct AcpiGenericAddress dsm_io, 157 FWCfgState *fw_cfg, Object *owner); 158 void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data, 159 BIOSLinker *linker, NVDIMMState *state, 160 uint32_t ram_slots); 161 void nvdimm_plug(NVDIMMState *state); 162 void nvdimm_acpi_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev); 163 #endif 164