1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * libnvdimm - Non-volatile-memory Devices Subsystem
5 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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>
16 struct badrange_entry {
19 struct list_head list;
23 struct list_head list;
28 /* when a dimm supports both PMEM and BLK access a label is required */
30 /* unarmed memory devices may not persist writes */
32 /* locked memory devices should not be accessed */
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 */
38 /* ignore / filter NSLABEL_FLAG_LOCAL for this DIMM, i.e. no aliasing */
40 /* dimm supports namespace labels */
43 /* need to set a limit somewhere, but yes, this is likely overkill */
44 ND_IOCTL_MAX_BUFLEN = SZ_4M,
46 ND_CMD_MAX_ENVELOPE = 256,
49 /* region flag indicating to direct-map persistent memory by default */
50 ND_REGION_PAGEMAP = 0,
52 * Platform ensures entire CPU store data path is flushed to pmem on
55 ND_REGION_PERSIST_CACHE = 1,
57 * Platform provides mechanisms to automatically flush outstanding
58 * write data from memory controler to pmem on system power loss.
61 ND_REGION_PERSIST_MEMCTRL = 2,
63 /* Platform provides asynchronous flush mechanism */
66 /* mark newly adjusted resources as requiring a label update */
67 DPA_RESOURCE_ADJUSTED = 1 << 0,
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);
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;
84 struct device_node *of_node;
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);
94 u32 in_sizes[ND_CMD_MAX_ELEM];
95 int out_sizes[ND_CMD_MAX_ELEM];
98 struct nd_interleave_set {
99 /* v1.1 definition of the interleave-set-cookie algorithm */
101 /* v1.2 definition of the interleave-set-cookie algorithm */
103 /* compatibility with initial buggy Linux implementation */
109 struct nd_mapping_desc {
110 struct nvdimm *nvdimm;
117 struct nd_region_desc {
118 struct resource *res;
119 struct nd_mapping_desc *mapping;
121 const struct attribute_group **attr_groups;
122 struct nd_interleave_set *nd_set;
128 struct device_node *of_node;
129 int (*flush)(struct nd_region *nd_region, struct bio *bio);
133 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
134 size_t size, unsigned long flags);
135 static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
136 resource_size_t offset, size_t size)
138 return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
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;
152 static inline struct nd_blk_region_desc *to_blk_region_desc(
153 struct nd_region_desc *ndr_desc)
155 return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
160 * Note that separate bits for locked + unlocked are defined so that
161 * 'flags == 0' corresponds to an error / not-supported state.
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,
171 #define NVDIMM_PASSPHRASE_LEN 32
172 #define NVDIMM_KEY_DESC_LEN 22
174 struct nvdimm_key_data {
175 u8 data[NVDIMM_PASSPHRASE_LEN];
178 enum nvdimm_passphrase_type {
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);
203 void badrange_init(struct badrange *badrange);
204 int badrange_add(struct badrange *badrange, u64 addr, u64 length);
205 void badrange_forget(struct badrange *badrange, phys_addr_t start,
207 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
209 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
210 struct nvdimm_bus_descriptor *nfit_desc);
211 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
212 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
213 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
214 struct nvdimm *to_nvdimm(struct device *dev);
215 struct nd_region *to_nd_region(struct device *dev);
216 struct device *nd_region_dev(struct nd_region *nd_region);
217 struct nd_blk_region *to_nd_blk_region(struct device *dev);
218 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
219 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
220 const char *nvdimm_name(struct nvdimm *nvdimm);
221 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
222 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
223 void *nvdimm_provider_data(struct nvdimm *nvdimm);
224 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
225 void *provider_data, const struct attribute_group **groups,
226 unsigned long flags, unsigned long cmd_mask, int num_flush,
227 struct resource *flush_wpq, const char *dimm_id,
228 const struct nvdimm_security_ops *sec_ops);
229 static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
230 void *provider_data, const struct attribute_group **groups,
231 unsigned long flags, unsigned long cmd_mask, int num_flush,
232 struct resource *flush_wpq)
234 return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
235 cmd_mask, num_flush, flush_wpq, NULL, NULL);
238 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
239 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
240 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
241 const struct nd_cmd_desc *desc, int idx, void *buf);
242 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
243 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
244 const u32 *out_field, unsigned long remainder);
245 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
246 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
247 struct nd_region_desc *ndr_desc);
248 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
249 struct nd_region_desc *ndr_desc);
250 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
251 struct nd_region_desc *ndr_desc);
252 void *nd_region_provider_data(struct nd_region *nd_region);
253 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
254 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
255 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
256 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
257 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
258 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
259 u64 nd_fletcher64(void *addr, size_t len, bool le);
260 int nvdimm_flush(struct nd_region *nd_region, struct bio *bio);
261 int generic_nvdimm_flush(struct nd_region *nd_region);
262 int nvdimm_has_flush(struct nd_region *nd_region);
263 int nvdimm_has_cache(struct nd_region *nd_region);
264 int nvdimm_in_overwrite(struct nvdimm *nvdimm);
265 bool is_nvdimm_sync(struct nd_region *nd_region);
267 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
268 unsigned int buf_len, int *cmd_rc)
270 struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
271 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
273 return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
276 #ifdef CONFIG_ARCH_HAS_PMEM_API
277 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
278 void arch_wb_cache_pmem(void *addr, size_t size);
279 void arch_invalidate_pmem(void *addr, size_t size);
281 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
282 static inline void arch_wb_cache_pmem(void *addr, size_t size)
285 static inline void arch_invalidate_pmem(void *addr, size_t size)
290 #endif /* __LIBNVDIMM_H__ */