root/include/linux/libnvdimm.h

INCLUDED FROM

DEFINITIONS

1. devm_nvdimm_ioremap
2. to_blk_region_desc
3. nvdimm_create
4. nvdimm_ctl
5. arch_wb_cache_pmem
6. arch_invalidate_pmem

   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 
  41         /* need to set a limit somewhere, but yes, this is likely overkill */
  42         ND_IOCTL_MAX_BUFLEN = SZ_4M,
  43         ND_CMD_MAX_ELEM = 5,
  44         ND_CMD_MAX_ENVELOPE = 256,
  45         ND_MAX_MAPPINGS = 32,
  46 
  47         /* region flag indicating to direct-map persistent memory by default */
  48         ND_REGION_PAGEMAP = 0,
  49         /*
  50          * Platform ensures entire CPU store data path is flushed to pmem on
  51          * system power loss.
  52          */
  53         ND_REGION_PERSIST_CACHE = 1,
  54         /*
  55          * Platform provides mechanisms to automatically flush outstanding
  56          * write data from memory controler to pmem on system power loss.
  57          * (ADR)
  58          */
  59         ND_REGION_PERSIST_MEMCTRL = 2,
  60 
  61         /* Platform provides asynchronous flush mechanism */
  62         ND_REGION_ASYNC = 3,
  63 
  64         /* mark newly adjusted resources as requiring a label update */
  65         DPA_RESOURCE_ADJUSTED = 1 << 0,
  66 };
  67 
  68 extern struct attribute_group nvdimm_bus_attribute_group;
  69 extern struct attribute_group nvdimm_attribute_group;
  70 extern struct attribute_group nd_device_attribute_group;
  71 extern struct attribute_group nd_numa_attribute_group;
  72 extern struct attribute_group nd_region_attribute_group;
  73 extern struct attribute_group nd_mapping_attribute_group;
  74 
  75 struct nvdimm;
  76 struct nvdimm_bus_descriptor;
  77 typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
  78                 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
  79                 unsigned int buf_len, int *cmd_rc);
  80 
  81 struct device_node;
  82 struct nvdimm_bus_descriptor {
  83         const struct attribute_group **attr_groups;
  84         unsigned long bus_dsm_mask;
  85         unsigned long cmd_mask;
  86         struct module *module;
  87         char *provider_name;
  88         struct device_node *of_node;
  89         ndctl_fn ndctl;
  90         int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
  91         int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
  92                         struct nvdimm *nvdimm, unsigned int cmd, void *data);
  93 };
  94 
  95 struct nd_cmd_desc {
  96         int in_num;
  97         int out_num;
  98         u32 in_sizes[ND_CMD_MAX_ELEM];
  99         int out_sizes[ND_CMD_MAX_ELEM];
 100 };
 101 
 102 struct nd_interleave_set {
 103         /* v1.1 definition of the interleave-set-cookie algorithm */
 104         u64 cookie1;
 105         /* v1.2 definition of the interleave-set-cookie algorithm */
 106         u64 cookie2;
 107         /* compatibility with initial buggy Linux implementation */
 108         u64 altcookie;
 109 
 110         guid_t type_guid;
 111 };
 112 
 113 struct nd_mapping_desc {
 114         struct nvdimm *nvdimm;
 115         u64 start;
 116         u64 size;
 117         int position;
 118 };
 119 
 120 struct nd_region;
 121 struct nd_region_desc {
 122         struct resource *res;
 123         struct nd_mapping_desc *mapping;
 124         u16 num_mappings;
 125         const struct attribute_group **attr_groups;
 126         struct nd_interleave_set *nd_set;
 127         void *provider_data;
 128         int num_lanes;
 129         int numa_node;
 130         int target_node;
 131         unsigned long flags;
 132         struct device_node *of_node;
 133         int (*flush)(struct nd_region *nd_region, struct bio *bio);
 134 };
 135 
 136 struct device;
 137 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
 138                 size_t size, unsigned long flags);
 139 static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
 140                 resource_size_t offset, size_t size)
 141 {
 142         return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
 143 }
 144 
 145 struct nvdimm_bus;
 146 struct module;
 147 struct device;
 148 struct nd_blk_region;
 149 struct nd_blk_region_desc {
 150         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 151         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 152                         void *iobuf, u64 len, int rw);
 153         struct nd_region_desc ndr_desc;
 154 };
 155 
 156 static inline struct nd_blk_region_desc *to_blk_region_desc(
 157                 struct nd_region_desc *ndr_desc)
 158 {
 159         return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
 160 
 161 }
 162 
 163 /*
 164  * Note that separate bits for locked + unlocked are defined so that
 165  * 'flags == 0' corresponds to an error / not-supported state.
 166  */
 167 enum nvdimm_security_bits {
 168         NVDIMM_SECURITY_DISABLED,
 169         NVDIMM_SECURITY_UNLOCKED,
 170         NVDIMM_SECURITY_LOCKED,
 171         NVDIMM_SECURITY_FROZEN,
 172         NVDIMM_SECURITY_OVERWRITE,
 173 };
 174 
 175 #define NVDIMM_PASSPHRASE_LEN           32
 176 #define NVDIMM_KEY_DESC_LEN             22
 177 
 178 struct nvdimm_key_data {
 179         u8 data[NVDIMM_PASSPHRASE_LEN];
 180 };
 181 
 182 enum nvdimm_passphrase_type {
 183         NVDIMM_USER,
 184         NVDIMM_MASTER,
 185 };
 186 
 187 struct nvdimm_security_ops {
 188         unsigned long (*get_flags)(struct nvdimm *nvdimm,
 189                         enum nvdimm_passphrase_type pass_type);
 190         int (*freeze)(struct nvdimm *nvdimm);
 191         int (*change_key)(struct nvdimm *nvdimm,
 192                         const struct nvdimm_key_data *old_data,
 193                         const struct nvdimm_key_data *new_data,
 194                         enum nvdimm_passphrase_type pass_type);
 195         int (*unlock)(struct nvdimm *nvdimm,
 196                         const struct nvdimm_key_data *key_data);
 197         int (*disable)(struct nvdimm *nvdimm,
 198                         const struct nvdimm_key_data *key_data);
 199         int (*erase)(struct nvdimm *nvdimm,
 200                         const struct nvdimm_key_data *key_data,
 201                         enum nvdimm_passphrase_type pass_type);
 202         int (*overwrite)(struct nvdimm *nvdimm,
 203                         const struct nvdimm_key_data *key_data);
 204         int (*query_overwrite)(struct nvdimm *nvdimm);
 205 };
 206 
 207 void badrange_init(struct badrange *badrange);
 208 int badrange_add(struct badrange *badrange, u64 addr, u64 length);
 209 void badrange_forget(struct badrange *badrange, phys_addr_t start,
 210                 unsigned int len);
 211 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
 212                 u64 length);
 213 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
 214                 struct nvdimm_bus_descriptor *nfit_desc);
 215 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
 216 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
 217 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
 218 struct nvdimm *to_nvdimm(struct device *dev);
 219 struct nd_region *to_nd_region(struct device *dev);
 220 struct device *nd_region_dev(struct nd_region *nd_region);
 221 struct nd_blk_region *to_nd_blk_region(struct device *dev);
 222 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
 223 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
 224 const char *nvdimm_name(struct nvdimm *nvdimm);
 225 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
 226 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
 227 void *nvdimm_provider_data(struct nvdimm *nvdimm);
 228 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
 229                 void *provider_data, const struct attribute_group **groups,
 230                 unsigned long flags, unsigned long cmd_mask, int num_flush,
 231                 struct resource *flush_wpq, const char *dimm_id,
 232                 const struct nvdimm_security_ops *sec_ops);
 233 static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
 234                 void *provider_data, const struct attribute_group **groups,
 235                 unsigned long flags, unsigned long cmd_mask, int num_flush,
 236                 struct resource *flush_wpq)
 237 {
 238         return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
 239                         cmd_mask, num_flush, flush_wpq, NULL, NULL);
 240 }
 241 
 242 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
 243 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
 244 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 245                 const struct nd_cmd_desc *desc, int idx, void *buf);
 246 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 247                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 248                 const u32 *out_field, unsigned long remainder);
 249 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
 250 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
 251                 struct nd_region_desc *ndr_desc);
 252 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 253                 struct nd_region_desc *ndr_desc);
 254 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 255                 struct nd_region_desc *ndr_desc);
 256 void *nd_region_provider_data(struct nd_region *nd_region);
 257 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
 258 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
 259 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
 260 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
 261 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
 262 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
 263 u64 nd_fletcher64(void *addr, size_t len, bool le);
 264 int nvdimm_flush(struct nd_region *nd_region, struct bio *bio);
 265 int generic_nvdimm_flush(struct nd_region *nd_region);
 266 int nvdimm_has_flush(struct nd_region *nd_region);
 267 int nvdimm_has_cache(struct nd_region *nd_region);
 268 int nvdimm_in_overwrite(struct nvdimm *nvdimm);
 269 bool is_nvdimm_sync(struct nd_region *nd_region);
 270 
 271 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
 272                 unsigned int buf_len, int *cmd_rc)
 273 {
 274         struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
 275         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
 276 
 277         return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
 278 }
 279 
 280 #ifdef CONFIG_ARCH_HAS_PMEM_API
 281 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
 282 void arch_wb_cache_pmem(void *addr, size_t size);
 283 void arch_invalidate_pmem(void *addr, size_t size);
 284 #else
 285 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
 286 static inline void arch_wb_cache_pmem(void *addr, size_t size)
 287 {
 288 }
 289 static inline void arch_invalidate_pmem(void *addr, size_t size)
 290 {
 291 }
 292 #endif
 293 
 294 #endif /* __LIBNVDIMM_H__ */