summaryrefslogtreecommitdiff
path: root/include/linux/libnvdimm.h
blob: 7074aa9af525c7b10a908eb677ff62e238e4df6c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * libnvdimm - Non-volatile-memory Devices Subsystem
 *
 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 */
#ifndef __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <linux/types.h>
#include <linux/uuid.h>
#include <linux/spinlock.h>
#include <linux/bio.h>

struct badrange_entry {
	u64 start;
	u64 length;
	struct list_head list;
};

struct badrange {
	struct list_head list;
	spinlock_t lock;
};

enum {
	/* when a dimm supports both PMEM and BLK access a label is required */
	NDD_ALIASING = 0,
	/* unarmed memory devices may not persist writes */
	NDD_UNARMED = 1,
	/* locked memory devices should not be accessed */
	NDD_LOCKED = 2,
	/* memory under security wipes should not be accessed */
	NDD_SECURITY_OVERWRITE = 3,
	/*  tracking whether or not there is a pending device reference */
	NDD_WORK_PENDING = 4,
	/* ignore / filter NSLABEL_FLAG_LOCAL for this DIMM, i.e. no aliasing */
	NDD_NOBLK = 5,
	/* dimm supports namespace labels */
	NDD_LABELING = 6,

	/* need to set a limit somewhere, but yes, this is likely overkill */
	ND_IOCTL_MAX_BUFLEN = SZ_4M,
	ND_CMD_MAX_ELEM = 5,
	ND_CMD_MAX_ENVELOPE = 256,
	ND_MAX_MAPPINGS = 32,

	/* region flag indicating to direct-map persistent memory by default */
	ND_REGION_PAGEMAP = 0,
	/*
	 * Platform ensures entire CPU store data path is flushed to pmem on
	 * system power loss.
	 */
	ND_REGION_PERSIST_CACHE = 1,
	/*
	 * Platform provides mechanisms to automatically flush outstanding
	 * write data from memory controler to pmem on system power loss.
	 * (ADR)
	 */
	ND_REGION_PERSIST_MEMCTRL = 2,

	/* Platform provides asynchronous flush mechanism */
	ND_REGION_ASYNC = 3,

	/* mark newly adjusted resources as requiring a label update */
	DPA_RESOURCE_ADJUSTED = 1 << 0,
};

struct nvdimm;
struct nvdimm_bus_descriptor;
typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
		struct nvdimm *nvdimm, unsigned int cmd, void *buf,
		unsigned int buf_len, int *cmd_rc);

struct device_node;
struct nvdimm_bus_descriptor {
	const struct attribute_group **attr_groups;
	unsigned long cmd_mask;
	unsigned long dimm_family_mask;
	unsigned long bus_family_mask;
	struct module *module;
	char *provider_name;
	struct device_node *of_node;
	ndctl_fn ndctl;
	int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
	int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
			struct nvdimm *nvdimm, unsigned int cmd, void *data);
	const struct nvdimm_bus_fw_ops *fw_ops;
};

struct nd_cmd_desc {
	int in_num;
	int out_num;
	u32 in_sizes[ND_CMD_MAX_ELEM];
	int out_sizes[ND_CMD_MAX_ELEM];
};

struct nd_interleave_set {
	/* v1.1 definition of the interleave-set-cookie algorithm */
	u64 cookie1;
	/* v1.2 definition of the interleave-set-cookie algorithm */
	u64 cookie2;
	/* compatibility with initial buggy Linux implementation */
	u64 altcookie;

	guid_t type_guid;
};

struct nd_mapping_desc {
	struct nvdimm *nvdimm;
	u64 start;
	u64 size;
	int position;
};

struct nd_region;
struct nd_region_desc {
	struct resource *res;
	struct nd_mapping_desc *mapping;
	u16 num_mappings;
	const struct attribute_group **attr_groups;
	struct nd_interleave_set *nd_set;
	void *provider_data;
	int num_lanes;
	int numa_node;
	int target_node;
	unsigned long flags;
	struct device_node *of_node;
	int (*flush)(struct nd_region *nd_region, struct bio *bio);
};

struct device;
void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
		size_t size, unsigned long flags);
static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
		resource_size_t offset, size_t size)
{
	return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
}

struct nvdimm_bus;
struct module;
struct nd_blk_region;
struct nd_blk_region_desc {
	int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
	int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
			void *iobuf, u64 len, int rw);
	struct nd_region_desc ndr_desc;
};

static inline struct nd_blk_region_desc *to_blk_region_desc(
		struct nd_region_desc *ndr_desc)
{
	return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);

}

/*
 * Note that separate bits for locked + unlocked are defined so that
 * 'flags == 0' corresponds to an error / not-supported state.
 */
enum nvdimm_security_bits {
	NVDIMM_SECURITY_DISABLED,
	NVDIMM_SECURITY_UNLOCKED,
	NVDIMM_SECURITY_LOCKED,
	NVDIMM_SECURITY_FROZEN,
	NVDIMM_SECURITY_OVERWRITE,
};

#define NVDIMM_PASSPHRASE_LEN		32
#define NVDIMM_KEY_DESC_LEN		22

struct nvdimm_key_data {
	u8 data[NVDIMM_PASSPHRASE_LEN];
};

enum nvdimm_passphrase_type {
	NVDIMM_USER,
	NVDIMM_MASTER,
};

struct nvdimm_security_ops {
	unsigned long (*get_flags)(struct nvdimm *nvdimm,
			enum nvdimm_passphrase_type pass_type);
	int (*freeze)(struct nvdimm *nvdimm);
	int (*change_key)(struct nvdimm *nvdimm,
			const struct nvdimm_key_data *old_data,
			const struct nvdimm_key_data *new_data,
			enum nvdimm_passphrase_type pass_type);
	int (*unlock)(struct nvdimm *nvdimm,
			const struct nvdimm_key_data *key_data);
	int (*disable)(struct nvdimm *nvdimm,
			const struct nvdimm_key_data *key_data);
	int (*erase)(struct nvdimm *nvdimm,
			const struct nvdimm_key_data *key_data,
			enum nvdimm_passphrase_type pass_type);
	int (*overwrite)(struct nvdimm *nvdimm,
			const struct nvdimm_key_data *key_data);
	int (*query_overwrite)(struct nvdimm *nvdimm);
};

enum nvdimm_fwa_state {
	NVDIMM_FWA_INVALID,
	NVDIMM_FWA_IDLE,
	NVDIMM_FWA_ARMED,
	NVDIMM_FWA_BUSY,
	NVDIMM_FWA_ARM_OVERFLOW,
};

enum nvdimm_fwa_trigger {
	NVDIMM_FWA_ARM,
	NVDIMM_FWA_DISARM,
};

enum nvdimm_fwa_capability {
	NVDIMM_FWA_CAP_INVALID,
	NVDIMM_FWA_CAP_NONE,
	NVDIMM_FWA_CAP_QUIESCE,
	NVDIMM_FWA_CAP_LIVE,
};

enum nvdimm_fwa_result {
	NVDIMM_FWA_RESULT_INVALID,
	NVDIMM_FWA_RESULT_NONE,
	NVDIMM_FWA_RESULT_SUCCESS,
	NVDIMM_FWA_RESULT_NOTSTAGED,
	NVDIMM_FWA_RESULT_NEEDRESET,
	NVDIMM_FWA_RESULT_FAIL,
};

struct nvdimm_bus_fw_ops {
	enum nvdimm_fwa_state (*activate_state)
		(struct nvdimm_bus_descriptor *nd_desc);
	enum nvdimm_fwa_capability (*capability)
		(struct nvdimm_bus_descriptor *nd_desc);
	int (*activate)(struct nvdimm_bus_descriptor *nd_desc);
};

struct nvdimm_fw_ops {
	enum nvdimm_fwa_state (*activate_state)(struct nvdimm *nvdimm);
	enum nvdimm_fwa_result (*activate_result)(struct nvdimm *nvdimm);
	int (*arm)(struct nvdimm *nvdimm, enum nvdimm_fwa_trigger arg);
};

void badrange_init(struct badrange *badrange);
int badrange_add(struct badrange *badrange, u64 addr, u64 length);
void badrange_forget(struct badrange *badrange, phys_addr_t start,
		unsigned int len);
int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
		u64 length);
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
		struct nvdimm_bus_descriptor *nfit_desc);
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
struct nvdimm *to_nvdimm(struct device *dev);
struct nd_region *to_nd_region(struct device *dev);
struct device *nd_region_dev(struct nd_region *nd_region);
struct nd_blk_region *to_nd_blk_region(struct device *dev);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
const char *nvdimm_name(struct nvdimm *nvdimm);
struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
void *nvdimm_provider_data(struct nvdimm *nvdimm);
struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
		void *provider_data, const struct attribute_group **groups,
		unsigned long flags, unsigned long cmd_mask, int num_flush,
		struct resource *flush_wpq, const char *dimm_id,
		const struct nvdimm_security_ops *sec_ops,
		const struct nvdimm_fw_ops *fw_ops);
static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
		void *provider_data, const struct attribute_group **groups,
		unsigned long flags, unsigned long cmd_mask, int num_flush,
		struct resource *flush_wpq)
{
	return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
			cmd_mask, num_flush, flush_wpq, NULL, NULL, NULL);
}
void nvdimm_delete(struct nvdimm *nvdimm);

const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
		const struct nd_cmd_desc *desc, int idx, void *buf);
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
		const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
		const u32 *out_field, unsigned long remainder);
int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc);
void *nd_region_provider_data(struct nd_region *nd_region);
void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
u64 nd_fletcher64(void *addr, size_t len, bool le);
int nvdimm_flush(struct nd_region *nd_region, struct bio *bio);
int generic_nvdimm_flush(struct nd_region *nd_region);
int nvdimm_has_flush(struct nd_region *nd_region);
int nvdimm_has_cache(struct nd_region *nd_region);
int nvdimm_in_overwrite(struct nvdimm *nvdimm);
bool is_nvdimm_sync(struct nd_region *nd_region);

static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
		unsigned int buf_len, int *cmd_rc)
{
	struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
	struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);

	return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
}

#ifdef CONFIG_ARCH_HAS_PMEM_API
#define ARCH_MEMREMAP_PMEM MEMREMAP_WB
void arch_wb_cache_pmem(void *addr, size_t size);
void arch_invalidate_pmem(void *addr, size_t size);
#else
#define ARCH_MEMREMAP_PMEM MEMREMAP_WT
static inline void arch_wb_cache_pmem(void *addr, size_t size)
{
}
static inline void arch_invalidate_pmem(void *addr, size_t size)
{
}
#endif

#endif /* __LIBNVDIMM_H__ */