Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/kernel.h>
18#include <linux/sizes.h>
19#include <linux/types.h>
20
21enum {
22 /* when a dimm supports both PMEM and BLK access a label is required */
23 NDD_ALIASING = 1 << 0,
24 /* unarmed memory devices may not persist writes */
25 NDD_UNARMED = 1 << 1,
26
27 /* need to set a limit somewhere, but yes, this is likely overkill */
28 ND_IOCTL_MAX_BUFLEN = SZ_4M,
29 ND_CMD_MAX_ELEM = 5,
30 ND_CMD_MAX_ENVELOPE = 256,
31 ND_MAX_MAPPINGS = 32,
32
33 /* region flag indicating to direct-map persistent memory by default */
34 ND_REGION_PAGEMAP = 0,
35
36 /* mark newly adjusted resources as requiring a label update */
37 DPA_RESOURCE_ADJUSTED = 1 << 0,
38};
39
40extern struct attribute_group nvdimm_bus_attribute_group;
41extern struct attribute_group nvdimm_attribute_group;
42extern struct attribute_group nd_device_attribute_group;
43extern struct attribute_group nd_numa_attribute_group;
44extern struct attribute_group nd_region_attribute_group;
45extern struct attribute_group nd_mapping_attribute_group;
46
47struct nvdimm;
48struct nvdimm_bus_descriptor;
49typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
50 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
51 unsigned int buf_len, int *cmd_rc);
52
53struct nd_namespace_label;
54struct nvdimm_drvdata;
55
56struct nd_mapping {
57 struct nvdimm *nvdimm;
58 struct nd_namespace_label **labels;
59 u64 start;
60 u64 size;
61 /*
62 * @ndd is for private use at region enable / disable time for
63 * get_ndd() + put_ndd(), all other nd_mapping to ndd
64 * conversions use to_ndd() which respects enabled state of the
65 * nvdimm.
66 */
67 struct nvdimm_drvdata *ndd;
68};
69
70struct nvdimm_bus_descriptor {
71 const struct attribute_group **attr_groups;
72 unsigned long cmd_mask;
73 struct module *module;
74 char *provider_name;
75 ndctl_fn ndctl;
76 int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
77 int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
78 struct nvdimm *nvdimm, unsigned int cmd);
79};
80
81struct nd_cmd_desc {
82 int in_num;
83 int out_num;
84 u32 in_sizes[ND_CMD_MAX_ELEM];
85 int out_sizes[ND_CMD_MAX_ELEM];
86};
87
88struct nd_interleave_set {
89 u64 cookie;
90};
91
92struct nd_region_desc {
93 struct resource *res;
94 struct nd_mapping *nd_mapping;
95 u16 num_mappings;
96 const struct attribute_group **attr_groups;
97 struct nd_interleave_set *nd_set;
98 void *provider_data;
99 int num_lanes;
100 int numa_node;
101 unsigned long flags;
102};
103
104struct device;
105void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
106 size_t size, unsigned long flags);
107static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
108 resource_size_t offset, size_t size)
109{
110 return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
111}
112
113struct nvdimm_bus;
114struct module;
115struct device;
116struct nd_blk_region;
117struct nd_blk_region_desc {
118 int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
119 int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
120 void *iobuf, u64 len, int rw);
121 struct nd_region_desc ndr_desc;
122};
123
124static inline struct nd_blk_region_desc *to_blk_region_desc(
125 struct nd_region_desc *ndr_desc)
126{
127 return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
128
129}
130
131int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length);
132struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
133 struct nvdimm_bus_descriptor *nfit_desc);
134void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
135struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
136struct nvdimm *to_nvdimm(struct device *dev);
137struct nd_region *to_nd_region(struct device *dev);
138struct nd_blk_region *to_nd_blk_region(struct device *dev);
139struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
140struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
141const char *nvdimm_name(struct nvdimm *nvdimm);
142unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
143void *nvdimm_provider_data(struct nvdimm *nvdimm);
144struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
145 const struct attribute_group **groups, unsigned long flags,
146 unsigned long cmd_mask, int num_flush,
147 struct resource *flush_wpq);
148const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
149const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
150u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
151 const struct nd_cmd_desc *desc, int idx, void *buf);
152u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
153 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
154 const u32 *out_field);
155int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
156struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
157 struct nd_region_desc *ndr_desc);
158struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
159 struct nd_region_desc *ndr_desc);
160struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
161 struct nd_region_desc *ndr_desc);
162void *nd_region_provider_data(struct nd_region *nd_region);
163void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
164void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
165struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
166unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
167void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
168u64 nd_fletcher64(void *addr, size_t len, bool le);
169void nvdimm_flush(struct nd_region *nd_region);
170int nvdimm_has_flush(struct nd_region *nd_region);
171#endif /* __LIBNVDIMM_H__ */