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4d88a97a DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #ifndef __LINUX_ND_H__ | |
14 | #define __LINUX_ND_H__ | |
8c2f7e86 | 15 | #include <linux/fs.h> |
4d88a97a DW |
16 | #include <linux/ndctl.h> |
17 | #include <linux/device.h> | |
18 | ||
19 | struct nd_device_driver { | |
20 | struct device_driver drv; | |
21 | unsigned long type; | |
22 | int (*probe)(struct device *dev); | |
23 | int (*remove)(struct device *dev); | |
24 | }; | |
25 | ||
26 | static inline struct nd_device_driver *to_nd_device_driver( | |
27 | struct device_driver *drv) | |
28 | { | |
29 | return container_of(drv, struct nd_device_driver, drv); | |
3d88002e DW |
30 | }; |
31 | ||
8c2f7e86 DW |
32 | /** |
33 | * struct nd_namespace_common - core infrastructure of a namespace | |
34 | * @force_raw: ignore other personalities for the namespace (e.g. btt) | |
35 | * @dev: device model node | |
36 | * @claim: when set a another personality has taken ownership of the namespace | |
37 | * @rw_bytes: access the raw namespace capacity with byte-aligned transfers | |
38 | */ | |
39 | struct nd_namespace_common { | |
40 | int force_raw; | |
41 | struct device dev; | |
42 | struct device *claim; | |
43 | int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset, | |
44 | void *buf, size_t size, int rw); | |
45 | }; | |
46 | ||
47 | static inline struct nd_namespace_common *to_ndns(struct device *dev) | |
48 | { | |
49 | return container_of(dev, struct nd_namespace_common, dev); | |
50 | } | |
51 | ||
bf9bccc1 DW |
52 | /** |
53 | * struct nd_namespace_io - infrastructure for loading an nd_pmem instance | |
54 | * @dev: namespace device created by the nd region driver | |
55 | * @res: struct resource conversion of a NFIT SPA table | |
56 | */ | |
3d88002e | 57 | struct nd_namespace_io { |
8c2f7e86 | 58 | struct nd_namespace_common common; |
3d88002e DW |
59 | struct resource res; |
60 | }; | |
61 | ||
bf9bccc1 DW |
62 | /** |
63 | * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory | |
64 | * @nsio: device and system physical address range to drive | |
65 | * @alt_name: namespace name supplied in the dimm label | |
66 | * @uuid: namespace name supplied in the dimm label | |
67 | */ | |
68 | struct nd_namespace_pmem { | |
69 | struct nd_namespace_io nsio; | |
70 | char *alt_name; | |
71 | u8 *uuid; | |
72 | }; | |
73 | ||
1b40e09a DW |
74 | /** |
75 | * struct nd_namespace_blk - namespace for dimm-bounded persistent memory | |
1b40e09a DW |
76 | * @alt_name: namespace name supplied in the dimm label |
77 | * @uuid: namespace name supplied in the dimm label | |
78 | * @id: ida allocated id | |
79 | * @lbasize: blk namespaces have a native sector size when btt not present | |
80 | * @num_resources: number of dpa extents to claim | |
81 | * @res: discontiguous dpa extents for given dimm | |
82 | */ | |
83 | struct nd_namespace_blk { | |
8c2f7e86 | 84 | struct nd_namespace_common common; |
1b40e09a DW |
85 | char *alt_name; |
86 | u8 *uuid; | |
87 | int id; | |
88 | unsigned long lbasize; | |
89 | int num_resources; | |
90 | struct resource **res; | |
91 | }; | |
92 | ||
3d88002e DW |
93 | static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev) |
94 | { | |
8c2f7e86 | 95 | return container_of(dev, struct nd_namespace_io, common.dev); |
4d88a97a DW |
96 | } |
97 | ||
bf9bccc1 DW |
98 | static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev) |
99 | { | |
100 | struct nd_namespace_io *nsio = to_nd_namespace_io(dev); | |
101 | ||
102 | return container_of(nsio, struct nd_namespace_pmem, nsio); | |
103 | } | |
104 | ||
1b40e09a DW |
105 | static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev) |
106 | { | |
8c2f7e86 DW |
107 | return container_of(dev, struct nd_namespace_blk, common.dev); |
108 | } | |
109 | ||
110 | /** | |
111 | * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace | |
112 | * @ndns: device to read | |
113 | * @offset: namespace-relative starting offset | |
114 | * @buf: buffer to fill | |
115 | * @size: transfer length | |
116 | * | |
117 | * @buf is up-to-date upon return from this routine. | |
118 | */ | |
119 | static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns, | |
120 | resource_size_t offset, void *buf, size_t size) | |
121 | { | |
122 | return ndns->rw_bytes(ndns, offset, buf, size, READ); | |
123 | } | |
124 | ||
125 | /** | |
126 | * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace | |
127 | * @ndns: device to read | |
128 | * @offset: namespace-relative starting offset | |
129 | * @buf: buffer to drain | |
130 | * @size: transfer length | |
131 | * | |
132 | * NVDIMM Namepaces disks do not implement sectors internally. Depending on | |
133 | * the @ndns, the contents of @buf may be in cpu cache, platform buffers, | |
134 | * or on backing memory media upon return from this routine. Flushing | |
135 | * to media is handled internal to the @ndns driver, if at all. | |
136 | */ | |
137 | static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns, | |
138 | resource_size_t offset, void *buf, size_t size) | |
139 | { | |
140 | return ndns->rw_bytes(ndns, offset, buf, size, WRITE); | |
1b40e09a DW |
141 | } |
142 | ||
4d88a97a DW |
143 | #define MODULE_ALIAS_ND_DEVICE(type) \ |
144 | MODULE_ALIAS("nd:t" __stringify(type) "*") | |
145 | #define ND_DEVICE_MODALIAS_FMT "nd:t%d" | |
146 | ||
147 | int __must_check __nd_driver_register(struct nd_device_driver *nd_drv, | |
148 | struct module *module, const char *mod_name); | |
149 | #define nd_driver_register(driver) \ | |
150 | __nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) | |
151 | #endif /* __LINUX_ND_H__ */ |