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 */
41 /* need to set a limit somewhere, but yes, this is likely overkill */
42 ND_IOCTL_MAX_BUFLEN = SZ_4M,
44 ND_CMD_MAX_ENVELOPE = 256,
47 /* region flag indicating to direct-map persistent memory by default */
48 ND_REGION_PAGEMAP = 0,
50 * Platform ensures entire CPU store data path is flushed to pmem on
53 ND_REGION_PERSIST_CACHE = 1,
55 * Platform provides mechanisms to automatically flush outstanding
56 * write data from memory controler to pmem on system power loss.
59 ND_REGION_PERSIST_MEMCTRL = 2,
61 /* Platform provides asynchronous flush mechanism */
64 /* mark newly adjusted resources as requiring a label update */
65 DPA_RESOURCE_ADJUSTED = 1 << 0,
69 struct nvdimm_bus_descriptor;
70 typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
71 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
72 unsigned int buf_len, int *cmd_rc);
75 struct nvdimm_bus_descriptor {
76 const struct attribute_group **attr_groups;
77 unsigned long bus_dsm_mask;
78 unsigned long cmd_mask;
79 struct module *module;
81 struct device_node *of_node;
83 int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
84 int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
85 struct nvdimm *nvdimm, unsigned int cmd, void *data);
91 u32 in_sizes[ND_CMD_MAX_ELEM];
92 int out_sizes[ND_CMD_MAX_ELEM];
95 struct nd_interleave_set {
96 /* v1.1 definition of the interleave-set-cookie algorithm */
98 /* v1.2 definition of the interleave-set-cookie algorithm */
100 /* compatibility with initial buggy Linux implementation */
106 struct nd_mapping_desc {
107 struct nvdimm *nvdimm;
114 struct nd_region_desc {
115 struct resource *res;
116 struct nd_mapping_desc *mapping;
118 const struct attribute_group **attr_groups;
119 struct nd_interleave_set *nd_set;
125 struct device_node *of_node;
126 int (*flush)(struct nd_region *nd_region, struct bio *bio);
130 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
131 size_t size, unsigned long flags);
132 static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
133 resource_size_t offset, size_t size)
135 return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
141 struct nd_blk_region;
142 struct nd_blk_region_desc {
143 int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
144 int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
145 void *iobuf, u64 len, int rw);
146 struct nd_region_desc ndr_desc;
149 static inline struct nd_blk_region_desc *to_blk_region_desc(
150 struct nd_region_desc *ndr_desc)
152 return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
157 * Note that separate bits for locked + unlocked are defined so that
158 * 'flags == 0' corresponds to an error / not-supported state.
160 enum nvdimm_security_bits {
161 NVDIMM_SECURITY_DISABLED,
162 NVDIMM_SECURITY_UNLOCKED,
163 NVDIMM_SECURITY_LOCKED,
164 NVDIMM_SECURITY_FROZEN,
165 NVDIMM_SECURITY_OVERWRITE,
168 #define NVDIMM_PASSPHRASE_LEN 32
169 #define NVDIMM_KEY_DESC_LEN 22
171 struct nvdimm_key_data {
172 u8 data[NVDIMM_PASSPHRASE_LEN];
175 enum nvdimm_passphrase_type {
180 struct nvdimm_security_ops {
181 unsigned long (*get_flags)(struct nvdimm *nvdimm,
182 enum nvdimm_passphrase_type pass_type);
183 int (*freeze)(struct nvdimm *nvdimm);
184 int (*change_key)(struct nvdimm *nvdimm,
185 const struct nvdimm_key_data *old_data,
186 const struct nvdimm_key_data *new_data,
187 enum nvdimm_passphrase_type pass_type);
188 int (*unlock)(struct nvdimm *nvdimm,
189 const struct nvdimm_key_data *key_data);
190 int (*disable)(struct nvdimm *nvdimm,
191 const struct nvdimm_key_data *key_data);
192 int (*erase)(struct nvdimm *nvdimm,
193 const struct nvdimm_key_data *key_data,
194 enum nvdimm_passphrase_type pass_type);
195 int (*overwrite)(struct nvdimm *nvdimm,
196 const struct nvdimm_key_data *key_data);
197 int (*query_overwrite)(struct nvdimm *nvdimm);
200 void badrange_init(struct badrange *badrange);
201 int badrange_add(struct badrange *badrange, u64 addr, u64 length);
202 void badrange_forget(struct badrange *badrange, phys_addr_t start,
204 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
206 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
207 struct nvdimm_bus_descriptor *nfit_desc);
208 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
209 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
210 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
211 struct nvdimm *to_nvdimm(struct device *dev);
212 struct nd_region *to_nd_region(struct device *dev);
213 struct device *nd_region_dev(struct nd_region *nd_region);
214 struct nd_blk_region *to_nd_blk_region(struct device *dev);
215 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
216 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
217 const char *nvdimm_name(struct nvdimm *nvdimm);
218 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
219 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
220 void *nvdimm_provider_data(struct nvdimm *nvdimm);
221 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
222 void *provider_data, const struct attribute_group **groups,
223 unsigned long flags, unsigned long cmd_mask, int num_flush,
224 struct resource *flush_wpq, const char *dimm_id,
225 const struct nvdimm_security_ops *sec_ops);
226 static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
227 void *provider_data, const struct attribute_group **groups,
228 unsigned long flags, unsigned long cmd_mask, int num_flush,
229 struct resource *flush_wpq)
231 return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
232 cmd_mask, num_flush, flush_wpq, NULL, NULL);
235 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
236 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
237 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
238 const struct nd_cmd_desc *desc, int idx, void *buf);
239 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
240 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
241 const u32 *out_field, unsigned long remainder);
242 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
243 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
244 struct nd_region_desc *ndr_desc);
245 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
246 struct nd_region_desc *ndr_desc);
247 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
248 struct nd_region_desc *ndr_desc);
249 void *nd_region_provider_data(struct nd_region *nd_region);
250 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
251 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
252 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
253 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
254 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
255 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
256 u64 nd_fletcher64(void *addr, size_t len, bool le);
257 int nvdimm_flush(struct nd_region *nd_region, struct bio *bio);
258 int generic_nvdimm_flush(struct nd_region *nd_region);
259 int nvdimm_has_flush(struct nd_region *nd_region);
260 int nvdimm_has_cache(struct nd_region *nd_region);
261 int nvdimm_in_overwrite(struct nvdimm *nvdimm);
262 bool is_nvdimm_sync(struct nd_region *nd_region);
264 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
265 unsigned int buf_len, int *cmd_rc)
267 struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
268 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
270 return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
273 #ifdef CONFIG_ARCH_HAS_PMEM_API
274 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
275 void arch_wb_cache_pmem(void *addr, size_t size);
276 void arch_invalidate_pmem(void *addr, size_t size);
278 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
279 static inline void arch_wb_cache_pmem(void *addr, size_t size)
282 static inline void arch_invalidate_pmem(void *addr, size_t size)
287 #endif /* __LIBNVDIMM_H__ */