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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_NOT_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 enum nfit_fic {
44         NFIT_FIC_BYTE = 0x101, /* byte-addressable energy backed */
45         NFIT_FIC_BLK = 0x201, /* block-addressable non-energy backed */
46         NFIT_FIC_BYTEN = 0x301, /* byte-addressable non-energy backed */
47 };
48
49 enum {
50         NFIT_BLK_READ_FLUSH = 1,
51         NFIT_BLK_DCR_LATCH = 2,
52         NFIT_ARS_STATUS_DONE = 0,
53         NFIT_ARS_STATUS_BUSY = 1 << 16,
54         NFIT_ARS_STATUS_NONE = 2 << 16,
55         NFIT_ARS_STATUS_INTR = 3 << 16,
56         NFIT_ARS_START_BUSY = 6,
57         NFIT_ARS_CAP_NONE = 1,
58         NFIT_ARS_F_OVERFLOW = 1,
59 };
60
61 struct nfit_spa {
62         struct acpi_nfit_system_address *spa;
63         struct list_head list;
64         int is_registered;
65 };
66
67 struct nfit_dcr {
68         struct acpi_nfit_control_region *dcr;
69         struct list_head list;
70 };
71
72 struct nfit_bdw {
73         struct acpi_nfit_data_region *bdw;
74         struct list_head list;
75 };
76
77 struct nfit_idt {
78         struct acpi_nfit_interleave *idt;
79         struct list_head list;
80 };
81
82 struct nfit_flush {
83         struct acpi_nfit_flush_address *flush;
84         struct list_head list;
85 };
86
87 struct nfit_memdev {
88         struct acpi_nfit_memory_map *memdev;
89         struct list_head list;
90 };
91
92 /* assembled tables for a given dimm/memory-device */
93 struct nfit_mem {
94         struct nvdimm *nvdimm;
95         struct acpi_nfit_memory_map *memdev_dcr;
96         struct acpi_nfit_memory_map *memdev_pmem;
97         struct acpi_nfit_memory_map *memdev_bdw;
98         struct acpi_nfit_control_region *dcr;
99         struct acpi_nfit_data_region *bdw;
100         struct acpi_nfit_system_address *spa_dcr;
101         struct acpi_nfit_system_address *spa_bdw;
102         struct acpi_nfit_interleave *idt_dcr;
103         struct acpi_nfit_interleave *idt_bdw;
104         struct nfit_flush *nfit_flush;
105         struct list_head list;
106         struct acpi_device *adev;
107         unsigned long dsm_mask;
108 };
109
110 struct acpi_nfit_desc {
111         struct nvdimm_bus_descriptor nd_desc;
112         struct acpi_table_header acpi_header;
113         struct acpi_nfit_header *nfit;
114         struct mutex spa_map_mutex;
115         struct mutex init_mutex;
116         struct list_head spa_maps;
117         struct list_head memdevs;
118         struct list_head flushes;
119         struct list_head dimms;
120         struct list_head spas;
121         struct list_head dcrs;
122         struct list_head bdws;
123         struct list_head idts;
124         struct nvdimm_bus *nvdimm_bus;
125         struct device *dev;
126         unsigned long dimm_dsm_force_en;
127         unsigned long bus_dsm_force_en;
128         int (*blk_do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
129                         void *iobuf, u64 len, int rw);
130 };
131
132 enum nd_blk_mmio_selector {
133         BDW,
134         DCR,
135 };
136
137 struct nd_blk_addr {
138         union {
139                 void __iomem *base;
140                 void __pmem  *aperture;
141         };
142 };
143
144 struct nfit_blk {
145         struct nfit_blk_mmio {
146                 struct nd_blk_addr addr;
147                 u64 size;
148                 u64 base_offset;
149                 u32 line_size;
150                 u32 num_lines;
151                 u32 table_size;
152                 struct acpi_nfit_interleave *idt;
153                 struct acpi_nfit_system_address *spa;
154         } mmio[2];
155         struct nd_region *nd_region;
156         u64 bdw_offset; /* post interleave offset */
157         u64 stat_offset;
158         u64 cmd_offset;
159         void __iomem *nvdimm_flush;
160         u32 dimm_flags;
161 };
162
163 enum spa_map_type {
164         SPA_MAP_CONTROL,
165         SPA_MAP_APERTURE,
166 };
167
168 struct nfit_spa_mapping {
169         struct acpi_nfit_desc *acpi_desc;
170         struct acpi_nfit_system_address *spa;
171         struct list_head list;
172         struct kref kref;
173         enum spa_map_type type;
174         struct nd_blk_addr addr;
175 };
176
177 static inline struct nfit_spa_mapping *to_spa_map(struct kref *kref)
178 {
179         return container_of(kref, struct nfit_spa_mapping, kref);
180 }
181
182 static inline struct acpi_nfit_memory_map *__to_nfit_memdev(
183                 struct nfit_mem *nfit_mem)
184 {
185         if (nfit_mem->memdev_dcr)
186                 return nfit_mem->memdev_dcr;
187         return nfit_mem->memdev_pmem;
188 }
189
190 static inline struct acpi_nfit_desc *to_acpi_desc(
191                 struct nvdimm_bus_descriptor *nd_desc)
192 {
193         return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
194 }
195
196 const u8 *to_nfit_uuid(enum nfit_uuids id);
197 int acpi_nfit_init(struct acpi_nfit_desc *nfit, acpi_size sz);
198 void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev);
199 #endif /* __NFIT_H__ */