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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 #include "qom/object.h"
31
32 /*
33 * The minimum label data size is required by NVDIMM Namespace
34 * specification, see the chapter 2 Namespaces:
35 * "NVDIMMs following the NVDIMM Block Mode Specification use an area
36 * at least 128KB in size, which holds around 1000 labels."
37 */
38 #define MIN_NAMESPACE_LABEL_SIZE (128UL << 10)
39
40 #define TYPE_NVDIMM "nvdimm"
41 OBJECT_DECLARE_TYPE(NVDIMMDevice, NVDIMMClass, NVDIMM)
42
43 #define NVDIMM_LABEL_SIZE_PROP "label-size"
44 #define NVDIMM_UUID_PROP "uuid"
45 #define NVDIMM_UNARMED_PROP "unarmed"
46
47 struct NVDIMMDevice {
48 /* private */
49 PCDIMMDevice parent_obj;
50
51 /* public */
52
53 /*
54 * the size of label data in NVDIMM device which is presented to
55 * guest via __DSM "Get Namespace Label Size" function.
56 */
57 uint64_t label_size;
58
59 /*
60 * the address of label data which is read by __DSM "Get Namespace
61 * Label Data" function and written by __DSM "Set Namespace Label
62 * Data" function.
63 */
64 void *label_data;
65
66 /*
67 * it's the PMEM region in NVDIMM device, which is presented to
68 * guest via ACPI NFIT and _FIT method if NVDIMM hotplug is supported.
69 */
70 MemoryRegion *nvdimm_mr;
71
72 /*
73 * The 'on' value results in the unarmed flag set in ACPI NFIT,
74 * which can be used to notify guest implicitly that the host
75 * backend (e.g., files on HDD, /dev/pmemX, etc.) cannot guarantee
76 * the guest write persistence.
77 */
78 bool unarmed;
79
80 /*
81 * Whether our DIMM is backed by ROM, and even label data cannot be
82 * written. If set, implies that "unarmed" is also set.
83 */
84 bool readonly;
85
86 /*
87 * The PPC64 - spapr requires each nvdimm device have a uuid.
88 */
89 QemuUUID uuid;
90 };
91
92 struct NVDIMMClass {
93 /* private */
94 PCDIMMDeviceClass parent_class;
95
96 /* public */
97
98 /* read @size bytes from NVDIMM label data at @offset into @buf. */
99 void (*read_label_data)(NVDIMMDevice *nvdimm, void *buf,
100 uint64_t size, uint64_t offset);
101 /* write @size bytes from @buf to NVDIMM label data at @offset. */
102 void (*write_label_data)(NVDIMMDevice *nvdimm, const void *buf,
103 uint64_t size, uint64_t offset);
104 void (*realize)(NVDIMMDevice *nvdimm, Error **errp);
105 void (*unrealize)(NVDIMMDevice *nvdimm);
106 };
107
108 #define NVDIMM_DSM_MEM_FILE "etc/acpi/nvdimm-mem"
109
110 /*
111 * 32 bits IO port starting from 0x0a18 in guest is reserved for
112 * NVDIMM ACPI emulation.
113 */
114 #define NVDIMM_ACPI_IO_BASE 0x0a18
115 #define NVDIMM_ACPI_IO_LEN 4
116
117 /*
118 * NvdimmFitBuffer:
119 * @fit: FIT structures for present NVDIMMs. It is updated when
120 * the NVDIMM device is plugged or unplugged.
121 * @dirty: It allows OSPM to detect change and restart read in
122 * progress if there is any.
123 */
124 struct NvdimmFitBuffer {
125 GArray *fit;
126 bool dirty;
127 };
128 typedef struct NvdimmFitBuffer NvdimmFitBuffer;
129
130 struct NVDIMMState {
131 /* detect if NVDIMM support is enabled. */
132 bool is_enabled;
133
134 /* the data of the fw_cfg file NVDIMM_DSM_MEM_FILE. */
135 GArray *dsm_mem;
136
137 NvdimmFitBuffer fit_buf;
138
139 /* the IO region used by OSPM to transfer control to QEMU. */
140 MemoryRegion io_mr;
141
142 /*
143 * Platform capabilities, section 5.2.25.9 of ACPI 6.2 Errata A
144 */
145 int32_t persistence;
146 char *persistence_string;
147 struct AcpiGenericAddress dsm_io;
148 };
149 typedef struct NVDIMMState NVDIMMState;
150
151 void nvdimm_init_acpi_state(NVDIMMState *state, MemoryRegion *io,
152 struct AcpiGenericAddress dsm_io,
153 FWCfgState *fw_cfg, Object *owner);
154 void nvdimm_build_srat(GArray *table_data);
155 void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data,
156 BIOSLinker *linker, NVDIMMState *state,
157 uint32_t ram_slots, const char *oem_id,
158 const char *oem_table_id);
159 void nvdimm_plug(NVDIMMState *state);
160 void nvdimm_acpi_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev);
161 #endif