1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * libnvdimm - Non-volatile-memory Devices Subsystem
4 *
5 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
6 */
7 #ifndef __LIBNVDIMM_H__
8 #define __LIBNVDIMM_H__
9 #include <linux/kernel.h>
10 #include <linux/sizes.h>
11 #include <linux/types.h>
12 #include <linux/uuid.h>
13 #include <linux/spinlock.h>
14 #include <linux/bio.h>
15
16 struct badrange_entry {
17 u64 start;
18 u64 length;
19 struct list_head list;
20 };
21
22 struct badrange {
23 struct list_head list;
24 spinlock_t lock;
25 };
26
27 enum {
28 /* when a dimm supports both PMEM and BLK access a label is required */
29 NDD_ALIASING = 0,
30 /* unarmed memory devices may not persist writes */
31 NDD_UNARMED = 1,
32 /* locked memory devices should not be accessed */
33 NDD_LOCKED = 2,
34 /* memory under security wipes should not be accessed */
35 NDD_SECURITY_OVERWRITE = 3,
36 /* tracking whether or not there is a pending device reference */
37 NDD_WORK_PENDING = 4,
38 /* ignore / filter NSLABEL_FLAG_LOCAL for this DIMM, i.e. no aliasing */
39 NDD_NOBLK = 5,
40 /* dimm supports namespace labels */
41 NDD_LABELING = 6,
42
43 /* need to set a limit somewhere, but yes, this is likely overkill */
44 ND_IOCTL_MAX_BUFLEN = SZ_4M,
45 ND_CMD_MAX_ELEM = 5,
46 ND_CMD_MAX_ENVELOPE = 256,
47 ND_MAX_MAPPINGS = 32,
48
49 /* region flag indicating to direct-map persistent memory by default */
50 ND_REGION_PAGEMAP = 0,
51 /*
52 * Platform ensures entire CPU store data path is flushed to pmem on
53 * system power loss.
54 */
55 ND_REGION_PERSIST_CACHE = 1,
56 /*
57 * Platform provides mechanisms to automatically flush outstanding
58 * write data from memory controler to pmem on system power loss.
59 * (ADR)
60 */
61 ND_REGION_PERSIST_MEMCTRL = 2,
62
63 /* Platform provides asynchronous flush mechanism */
64 ND_REGION_ASYNC = 3,
65
66 /* mark newly adjusted resources as requiring a label update */
67 DPA_RESOURCE_ADJUSTED = 1 << 0,
68 };
69
70 struct nvdimm;
71 struct nvdimm_bus_descriptor;
72 typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
73 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
74 unsigned int buf_len, int *cmd_rc);
75
76 struct device_node;
77 struct nvdimm_bus_descriptor {
78 const struct attribute_group **attr_groups;
79 unsigned long cmd_mask;
80 unsigned long dimm_family_mask;
81 unsigned long bus_family_mask;
82 struct module *module;
83 char *provider_name;
84 struct device_node *of_node;
85 ndctl_fn ndctl;
86 int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
87 int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
88 struct nvdimm *nvdimm, unsigned int cmd, void *data);
89 const struct nvdimm_bus_fw_ops *fw_ops;
90 };
91
92 struct nd_cmd_desc {
93 int in_num;
94 int out_num;
95 u32 in_sizes[ND_CMD_MAX_ELEM];
96 int out_sizes[ND_CMD_MAX_ELEM];
97 };
98
99 struct nd_interleave_set {
100 /* v1.1 definition of the interleave-set-cookie algorithm */
101 u64 cookie1;
102 /* v1.2 definition of the interleave-set-cookie algorithm */
103 u64 cookie2;
104 /* compatibility with initial buggy Linux implementation */
105 u64 altcookie;
106
107 guid_t type_guid;
108 };
109
110 struct nd_mapping_desc {
111 struct nvdimm *nvdimm;
112 u64 start;
113 u64 size;
114 int position;
115 };
116
117 struct nd_region;
118 struct nd_region_desc {
119 struct resource *res;
120 struct nd_mapping_desc *mapping;
121 u16 num_mappings;
122 const struct attribute_group **attr_groups;
123 struct nd_interleave_set *nd_set;
124 void *provider_data;
125 int num_lanes;
126 int numa_node;
127 int target_node;
128 unsigned long flags;
129 struct device_node *of_node;
130 int (*flush)(struct nd_region *nd_region, struct bio *bio);
131 };
132
133 struct device;
134 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
135 size_t size, unsigned long flags);
devm_nvdimm_ioremap(struct device * dev,resource_size_t offset,size_t size)136 static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
137 resource_size_t offset, size_t size)
138 {
139 return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
140 }
141
142 struct nvdimm_bus;
143 struct module;
144 struct nd_blk_region;
145 struct nd_blk_region_desc {
146 int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
147 int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
148 void *iobuf, u64 len, int rw);
149 struct nd_region_desc ndr_desc;
150 };
151
to_blk_region_desc(struct nd_region_desc * ndr_desc)152 static inline struct nd_blk_region_desc *to_blk_region_desc(
153 struct nd_region_desc *ndr_desc)
154 {
155 return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
156
157 }
158
159 /*
160 * Note that separate bits for locked + unlocked are defined so that
161 * 'flags == 0' corresponds to an error / not-supported state.
162 */
163 enum nvdimm_security_bits {
164 NVDIMM_SECURITY_DISABLED,
165 NVDIMM_SECURITY_UNLOCKED,
166 NVDIMM_SECURITY_LOCKED,
167 NVDIMM_SECURITY_FROZEN,
168 NVDIMM_SECURITY_OVERWRITE,
169 };
170
171 #define NVDIMM_PASSPHRASE_LEN 32
172 #define NVDIMM_KEY_DESC_LEN 22
173
174 struct nvdimm_key_data {
175 u8 data[NVDIMM_PASSPHRASE_LEN];
176 };
177
178 enum nvdimm_passphrase_type {
179 NVDIMM_USER,
180 NVDIMM_MASTER,
181 };
182
183 struct nvdimm_security_ops {
184 unsigned long (*get_flags)(struct nvdimm *nvdimm,
185 enum nvdimm_passphrase_type pass_type);
186 int (*freeze)(struct nvdimm *nvdimm);
187 int (*change_key)(struct nvdimm *nvdimm,
188 const struct nvdimm_key_data *old_data,
189 const struct nvdimm_key_data *new_data,
190 enum nvdimm_passphrase_type pass_type);
191 int (*unlock)(struct nvdimm *nvdimm,
192 const struct nvdimm_key_data *key_data);
193 int (*disable)(struct nvdimm *nvdimm,
194 const struct nvdimm_key_data *key_data);
195 int (*erase)(struct nvdimm *nvdimm,
196 const struct nvdimm_key_data *key_data,
197 enum nvdimm_passphrase_type pass_type);
198 int (*overwrite)(struct nvdimm *nvdimm,
199 const struct nvdimm_key_data *key_data);
200 int (*query_overwrite)(struct nvdimm *nvdimm);
201 };
202
203 enum nvdimm_fwa_state {
204 NVDIMM_FWA_INVALID,
205 NVDIMM_FWA_IDLE,
206 NVDIMM_FWA_ARMED,
207 NVDIMM_FWA_BUSY,
208 NVDIMM_FWA_ARM_OVERFLOW,
209 };
210
211 enum nvdimm_fwa_trigger {
212 NVDIMM_FWA_ARM,
213 NVDIMM_FWA_DISARM,
214 };
215
216 enum nvdimm_fwa_capability {
217 NVDIMM_FWA_CAP_INVALID,
218 NVDIMM_FWA_CAP_NONE,
219 NVDIMM_FWA_CAP_QUIESCE,
220 NVDIMM_FWA_CAP_LIVE,
221 };
222
223 enum nvdimm_fwa_result {
224 NVDIMM_FWA_RESULT_INVALID,
225 NVDIMM_FWA_RESULT_NONE,
226 NVDIMM_FWA_RESULT_SUCCESS,
227 NVDIMM_FWA_RESULT_NOTSTAGED,
228 NVDIMM_FWA_RESULT_NEEDRESET,
229 NVDIMM_FWA_RESULT_FAIL,
230 };
231
232 struct nvdimm_bus_fw_ops {
233 enum nvdimm_fwa_state (*activate_state)
234 (struct nvdimm_bus_descriptor *nd_desc);
235 enum nvdimm_fwa_capability (*capability)
236 (struct nvdimm_bus_descriptor *nd_desc);
237 int (*activate)(struct nvdimm_bus_descriptor *nd_desc);
238 };
239
240 struct nvdimm_fw_ops {
241 enum nvdimm_fwa_state (*activate_state)(struct nvdimm *nvdimm);
242 enum nvdimm_fwa_result (*activate_result)(struct nvdimm *nvdimm);
243 int (*arm)(struct nvdimm *nvdimm, enum nvdimm_fwa_trigger arg);
244 };
245
246 void badrange_init(struct badrange *badrange);
247 int badrange_add(struct badrange *badrange, u64 addr, u64 length);
248 void badrange_forget(struct badrange *badrange, phys_addr_t start,
249 unsigned int len);
250 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
251 u64 length);
252 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
253 struct nvdimm_bus_descriptor *nfit_desc);
254 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
255 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
256 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
257 struct nvdimm *to_nvdimm(struct device *dev);
258 struct nd_region *to_nd_region(struct device *dev);
259 struct device *nd_region_dev(struct nd_region *nd_region);
260 struct nd_blk_region *to_nd_blk_region(struct device *dev);
261 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
262 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
263 const char *nvdimm_name(struct nvdimm *nvdimm);
264 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
265 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
266 void *nvdimm_provider_data(struct nvdimm *nvdimm);
267 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
268 void *provider_data, const struct attribute_group **groups,
269 unsigned long flags, unsigned long cmd_mask, int num_flush,
270 struct resource *flush_wpq, const char *dimm_id,
271 const struct nvdimm_security_ops *sec_ops,
272 const struct nvdimm_fw_ops *fw_ops);
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)273 static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
274 void *provider_data, const struct attribute_group **groups,
275 unsigned long flags, unsigned long cmd_mask, int num_flush,
276 struct resource *flush_wpq)
277 {
278 return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
279 cmd_mask, num_flush, flush_wpq, NULL, NULL, NULL);
280 }
281
282 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
283 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
284 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
285 const struct nd_cmd_desc *desc, int idx, void *buf);
286 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
287 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
288 const u32 *out_field, unsigned long remainder);
289 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
290 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
291 struct nd_region_desc *ndr_desc);
292 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
293 struct nd_region_desc *ndr_desc);
294 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
295 struct nd_region_desc *ndr_desc);
296 void *nd_region_provider_data(struct nd_region *nd_region);
297 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
298 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
299 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
300 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
301 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
302 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
303 u64 nd_fletcher64(void *addr, size_t len, bool le);
304 int nvdimm_flush(struct nd_region *nd_region, struct bio *bio);
305 int generic_nvdimm_flush(struct nd_region *nd_region);
306 int nvdimm_has_flush(struct nd_region *nd_region);
307 int nvdimm_has_cache(struct nd_region *nd_region);
308 int nvdimm_in_overwrite(struct nvdimm *nvdimm);
309 bool is_nvdimm_sync(struct nd_region *nd_region);
310
nvdimm_ctl(struct nvdimm * nvdimm,unsigned int cmd,void * buf,unsigned int buf_len,int * cmd_rc)311 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
312 unsigned int buf_len, int *cmd_rc)
313 {
314 struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
315 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
316
317 return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
318 }
319
320 #ifdef CONFIG_ARCH_HAS_PMEM_API
321 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
322 void arch_wb_cache_pmem(void *addr, size_t size);
323 void arch_invalidate_pmem(void *addr, size_t size);
324 #else
325 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
arch_wb_cache_pmem(void * addr,size_t size)326 static inline void arch_wb_cache_pmem(void *addr, size_t size)
327 {
328 }
arch_invalidate_pmem(void * addr,size_t size)329 static inline void arch_invalidate_pmem(void *addr, size_t size)
330 {
331 }
332 #endif
333
334 #endif /* __LIBNVDIMM_H__ */
335