libnvdimm, nfit: regions (block-data-window, persistent memory, volatile memory)
[firefly-linux-kernel-4.4.55.git] / include / linux / libnvdimm.h
1 /*
2  * libnvdimm - Non-volatile-memory Devices Subsystem
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 __LIBNVDIMM_H__
16 #define __LIBNVDIMM_H__
17 #include <linux/sizes.h>
18 #include <linux/types.h>
19
20 enum {
21         /* when a dimm supports both PMEM and BLK access a label is required */
22         NDD_ALIASING = 1 << 0,
23
24         /* need to set a limit somewhere, but yes, this is likely overkill */
25         ND_IOCTL_MAX_BUFLEN = SZ_4M,
26         ND_CMD_MAX_ELEM = 4,
27         ND_CMD_MAX_ENVELOPE = 16,
28         ND_CMD_ARS_STATUS_MAX = SZ_4K,
29         ND_MAX_MAPPINGS = 32,
30 };
31
32 extern struct attribute_group nvdimm_bus_attribute_group;
33 extern struct attribute_group nvdimm_attribute_group;
34 extern struct attribute_group nd_device_attribute_group;
35 extern struct attribute_group nd_region_attribute_group;
36 extern struct attribute_group nd_mapping_attribute_group;
37
38 struct nvdimm;
39 struct nvdimm_bus_descriptor;
40 typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
41                 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
42                 unsigned int buf_len);
43
44 struct nd_mapping {
45         struct nvdimm *nvdimm;
46         u64 start;
47         u64 size;
48 };
49
50 struct nvdimm_bus_descriptor {
51         const struct attribute_group **attr_groups;
52         unsigned long dsm_mask;
53         char *provider_name;
54         ndctl_fn ndctl;
55 };
56
57 struct nd_cmd_desc {
58         int in_num;
59         int out_num;
60         u32 in_sizes[ND_CMD_MAX_ELEM];
61         int out_sizes[ND_CMD_MAX_ELEM];
62 };
63
64 struct nd_region_desc {
65         struct resource *res;
66         struct nd_mapping *nd_mapping;
67         u16 num_mappings;
68         const struct attribute_group **attr_groups;
69         void *provider_data;
70 };
71
72 struct nvdimm_bus;
73 struct device;
74 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
75                 struct nvdimm_bus_descriptor *nfit_desc);
76 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
77 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
78 struct nvdimm *to_nvdimm(struct device *dev);
79 struct nd_region *to_nd_region(struct device *dev);
80 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
81 const char *nvdimm_name(struct nvdimm *nvdimm);
82 void *nvdimm_provider_data(struct nvdimm *nvdimm);
83 void *nd_region_provider_data(struct nd_region *nd_region);
84 struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
85                 const struct attribute_group **groups, unsigned long flags,
86                 unsigned long *dsm_mask);
87 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
88 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
89 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
90                 const struct nd_cmd_desc *desc, int idx, void *buf);
91 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
92                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
93                 const u32 *out_field);
94 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
95 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
96                 struct nd_region_desc *ndr_desc);
97 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
98                 struct nd_region_desc *ndr_desc);
99 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
100                 struct nd_region_desc *ndr_desc);
101 #endif /* __LIBNVDIMM_H__ */