include/linux/libnvdimm.h

   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 bus_dsm_mask;
  80         unsigned long cmd_mask;
  81         struct module *module;
  82         char *provider_name;
  83         struct device_node *of_node;
  84         ndctl_fn ndctl;
  85         int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
  86         int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
  87                         struct nvdimm *nvdimm, unsigned int cmd, void *data);
  88 };
  89
  90 struct nd_cmd_desc {
  91         int in_num;
  92         int out_num;
  93         u32 in_sizes[ND_CMD_MAX_ELEM];
  94         int out_sizes[ND_CMD_MAX_ELEM];
  95 };
  96
  97 struct nd_interleave_set {
  98         /* v1.1 definition of the interleave-set-cookie algorithm */
  99         u64 cookie1;
 100         /* v1.2 definition of the interleave-set-cookie algorithm */
 101         u64 cookie2;
 102         /* compatibility with initial buggy Linux implementation */
 103         u64 altcookie;
 104
 105         guid_t type_guid;
 106 };
 107
 108 struct nd_mapping_desc {
 109         struct nvdimm *nvdimm;
 110         u64 start;
 111         u64 size;
 112         int position;
 113 };
 114
 115 struct nd_region;
 116 struct nd_region_desc {
 117         struct resource *res;
 118         struct nd_mapping_desc *mapping;
 119         u16 num_mappings;
 120         const struct attribute_group **attr_groups;
 121         struct nd_interleave_set *nd_set;
 122         void *provider_data;
 123         int num_lanes;
 124         int numa_node;
 125         int target_node;
 126         unsigned long flags;
 127         struct device_node *of_node;
 128         int (*flush)(struct nd_region *nd_region, struct bio *bio);
 129 };
 130
 131 struct device;
 132 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
 133                 size_t size, unsigned long flags);
 134 static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
 135                 resource_size_t offset, size_t size)
 136 {
 137         return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
 138 }
 139
 140 struct nvdimm_bus;
 141 struct module;
 142 struct device;
 143 struct nd_blk_region;
 144 struct nd_blk_region_desc {
 145         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 146         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 147                         void *iobuf, u64 len, int rw);
 148         struct nd_region_desc ndr_desc;
 149 };
 150
 151 static inline struct nd_blk_region_desc *to_blk_region_desc(
 152                 struct nd_region_desc *ndr_desc)
 153 {
 154         return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
 155
 156 }
 157
 158 /*
 159  * Note that separate bits for locked + unlocked are defined so that
 160  * 'flags == 0' corresponds to an error / not-supported state.
 161  */
 162 enum nvdimm_security_bits {
 163         NVDIMM_SECURITY_DISABLED,
 164         NVDIMM_SECURITY_UNLOCKED,
 165         NVDIMM_SECURITY_LOCKED,
 166         NVDIMM_SECURITY_FROZEN,
 167         NVDIMM_SECURITY_OVERWRITE,
 168 };
 169
 170 #define NVDIMM_PASSPHRASE_LEN           32
 171 #define NVDIMM_KEY_DESC_LEN             22
 172
 173 struct nvdimm_key_data {
 174         u8 data[NVDIMM_PASSPHRASE_LEN];
 175 };
 176
 177 enum nvdimm_passphrase_type {
 178         NVDIMM_USER,
 179         NVDIMM_MASTER,
 180 };
 181
 182 struct nvdimm_security_ops {
 183         unsigned long (*get_flags)(struct nvdimm *nvdimm,
 184                         enum nvdimm_passphrase_type pass_type);
 185         int (*freeze)(struct nvdimm *nvdimm);
 186         int (*change_key)(struct nvdimm *nvdimm,
 187                         const struct nvdimm_key_data *old_data,
 188                         const struct nvdimm_key_data *new_data,
 189                         enum nvdimm_passphrase_type pass_type);
 190         int (*unlock)(struct nvdimm *nvdimm,
 191                         const struct nvdimm_key_data *key_data);
 192         int (*disable)(struct nvdimm *nvdimm,
 193                         const struct nvdimm_key_data *key_data);
 194         int (*erase)(struct nvdimm *nvdimm,
 195                         const struct nvdimm_key_data *key_data,
 196                         enum nvdimm_passphrase_type pass_type);
 197         int (*overwrite)(struct nvdimm *nvdimm,
 198                         const struct nvdimm_key_data *key_data);
 199         int (*query_overwrite)(struct nvdimm *nvdimm);
 200 };
 201
 202 void badrange_init(struct badrange *badrange);
 203 int badrange_add(struct badrange *badrange, u64 addr, u64 length);
 204 void badrange_forget(struct badrange *badrange, phys_addr_t start,
 205                 unsigned int len);
 206 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
 207                 u64 length);
 208 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
 209                 struct nvdimm_bus_descriptor *nfit_desc);
 210 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
 211 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
 212 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
 213 struct nvdimm *to_nvdimm(struct device *dev);
 214 struct nd_region *to_nd_region(struct device *dev);
 215 struct device *nd_region_dev(struct nd_region *nd_region);
 216 struct nd_blk_region *to_nd_blk_region(struct device *dev);
 217 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
 218 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
 219 const char *nvdimm_name(struct nvdimm *nvdimm);
 220 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
 221 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
 222 void *nvdimm_provider_data(struct nvdimm *nvdimm);
 223 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
 224                 void *provider_data, const struct attribute_group **groups,
 225                 unsigned long flags, unsigned long cmd_mask, int num_flush,
 226                 struct resource *flush_wpq, const char *dimm_id,
 227                 const struct nvdimm_security_ops *sec_ops);
 228 static inline 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)
 232 {
 233         return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
 234                         cmd_mask, num_flush, flush_wpq, NULL, NULL);
 235 }
 236
 237 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
 238 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
 239 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 240                 const struct nd_cmd_desc *desc, int idx, void *buf);
 241 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 242                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 243                 const u32 *out_field, unsigned long remainder);
 244 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
 245 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
 246                 struct nd_region_desc *ndr_desc);
 247 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 248                 struct nd_region_desc *ndr_desc);
 249 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 250                 struct nd_region_desc *ndr_desc);
 251 void *nd_region_provider_data(struct nd_region *nd_region);
 252 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
 253 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
 254 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
 255 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
 256 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
 257 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
 258 u64 nd_fletcher64(void *addr, size_t len, bool le);
 259 int nvdimm_flush(struct nd_region *nd_region, struct bio *bio);
 260 int generic_nvdimm_flush(struct nd_region *nd_region);
 261 int nvdimm_has_flush(struct nd_region *nd_region);
 262 int nvdimm_has_cache(struct nd_region *nd_region);
 263 int nvdimm_in_overwrite(struct nvdimm *nvdimm);
 264 bool is_nvdimm_sync(struct nd_region *nd_region);
 265
 266 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
 267                 unsigned int buf_len, int *cmd_rc)
 268 {
 269         struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
 270         struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
 271
 272         return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
 273 }
 274
 275 #ifdef CONFIG_ARCH_HAS_PMEM_API
 276 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
 277 void arch_wb_cache_pmem(void *addr, size_t size);
 278 void arch_invalidate_pmem(void *addr, size_t size);
 279 #else
 280 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
 281 static inline void arch_wb_cache_pmem(void *addr, size_t size)
 282 {
 283 }
 284 static inline void arch_invalidate_pmem(void *addr, size_t size)
 285 {
 286 }
 287 #endif
 288
 289 #endif /* __LIBNVDIMM_H__ */