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1 /*
2  * NVDIMM Firmware Interface Table - NFIT
3  *
4  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of version 2 of the GNU General Public License as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License for more details.
14  */
15 #ifndef __NFIT_H__
16 #define __NFIT_H__
17 #include <linux/libnvdimm.h>
18 #include <linux/types.h>
19 #include <linux/uuid.h>
20 #include <linux/acpi.h>
21 #include <acpi/acuuid.h>
22
23 #define UUID_NFIT_BUS "2f10e7a4-9e91-11e4-89d3-123b93f75cba"
24 #define UUID_NFIT_DIMM "4309ac30-0d11-11e4-9191-0800200c9a66"
25 #define ACPI_NFIT_MEM_FAILED_MASK (ACPI_NFIT_MEM_SAVE_FAILED \
26                 | ACPI_NFIT_MEM_RESTORE_FAILED | ACPI_NFIT_MEM_FLUSH_FAILED \
27                 | ACPI_NFIT_MEM_ARMED)
28
29 enum nfit_uuids {
30         NFIT_SPA_VOLATILE,
31         NFIT_SPA_PM,
32         NFIT_SPA_DCR,
33         NFIT_SPA_BDW,
34         NFIT_SPA_VDISK,
35         NFIT_SPA_VCD,
36         NFIT_SPA_PDISK,
37         NFIT_SPA_PCD,
38         NFIT_DEV_BUS,
39         NFIT_DEV_DIMM,
40         NFIT_UUID_MAX,
41 };
42
43 struct nfit_spa {
44         struct acpi_nfit_system_address *spa;
45         struct list_head list;
46 };
47
48 struct nfit_dcr {
49         struct acpi_nfit_control_region *dcr;
50         struct list_head list;
51 };
52
53 struct nfit_bdw {
54         struct acpi_nfit_data_region *bdw;
55         struct list_head list;
56 };
57
58 struct nfit_idt {
59         struct acpi_nfit_interleave *idt;
60         struct list_head list;
61 };
62
63 struct nfit_memdev {
64         struct acpi_nfit_memory_map *memdev;
65         struct list_head list;
66 };
67
68 /* assembled tables for a given dimm/memory-device */
69 struct nfit_mem {
70         struct nvdimm *nvdimm;
71         struct acpi_nfit_memory_map *memdev_dcr;
72         struct acpi_nfit_memory_map *memdev_pmem;
73         struct acpi_nfit_memory_map *memdev_bdw;
74         struct acpi_nfit_control_region *dcr;
75         struct acpi_nfit_data_region *bdw;
76         struct acpi_nfit_system_address *spa_dcr;
77         struct acpi_nfit_system_address *spa_bdw;
78         struct acpi_nfit_interleave *idt_dcr;
79         struct acpi_nfit_interleave *idt_bdw;
80         struct list_head list;
81         struct acpi_device *adev;
82         unsigned long dsm_mask;
83 };
84
85 struct acpi_nfit_desc {
86         struct nvdimm_bus_descriptor nd_desc;
87         struct acpi_table_nfit *nfit;
88         struct mutex spa_map_mutex;
89         struct list_head spa_maps;
90         struct list_head memdevs;
91         struct list_head dimms;
92         struct list_head spas;
93         struct list_head dcrs;
94         struct list_head bdws;
95         struct list_head idts;
96         struct nvdimm_bus *nvdimm_bus;
97         struct device *dev;
98         unsigned long dimm_dsm_force_en;
99         int (*blk_do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
100                         void *iobuf, u64 len, int rw);
101 };
102
103 enum nd_blk_mmio_selector {
104         BDW,
105         DCR,
106 };
107
108 struct nfit_blk {
109         struct nfit_blk_mmio {
110                 union {
111                         void __iomem *base;
112                         void *aperture;
113                 };
114                 u64 size;
115                 u64 base_offset;
116                 u32 line_size;
117                 u32 num_lines;
118                 u32 table_size;
119                 struct acpi_nfit_interleave *idt;
120                 struct acpi_nfit_system_address *spa;
121         } mmio[2];
122         struct nd_region *nd_region;
123         u64 bdw_offset; /* post interleave offset */
124         u64 stat_offset;
125         u64 cmd_offset;
126 };
127
128 struct nfit_spa_mapping {
129         struct acpi_nfit_desc *acpi_desc;
130         struct acpi_nfit_system_address *spa;
131         struct list_head list;
132         struct kref kref;
133         void __iomem *iomem;
134 };
135
136 static inline struct nfit_spa_mapping *to_spa_map(struct kref *kref)
137 {
138         return container_of(kref, struct nfit_spa_mapping, kref);
139 }
140
141 static inline struct acpi_nfit_memory_map *__to_nfit_memdev(
142                 struct nfit_mem *nfit_mem)
143 {
144         if (nfit_mem->memdev_dcr)
145                 return nfit_mem->memdev_dcr;
146         return nfit_mem->memdev_pmem;
147 }
148
149 static inline struct acpi_nfit_desc *to_acpi_desc(
150                 struct nvdimm_bus_descriptor *nd_desc)
151 {
152         return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
153 }
154
155 const u8 *to_nfit_uuid(enum nfit_uuids id);
156 int acpi_nfit_init(struct acpi_nfit_desc *nfit, acpi_size sz);
157 extern const struct attribute_group *acpi_nfit_attribute_groups[];
158 #endif /* __NFIT_H__ */