drivers/nvdimm/nd-core.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #ifndef __ND_CORE_H__
   6 #define __ND_CORE_H__
   7 #include <linux/libnvdimm.h>
   8 #include <linux/device.h>
   9 #include <linux/sizes.h>
  10 #include <linux/mutex.h>
  11 #include <linux/nd.h>
  12 #include "nd.h"
  13
  14 extern struct list_head nvdimm_bus_list;
  15 extern struct mutex nvdimm_bus_list_mutex;
  16 extern int nvdimm_major;
  17 extern struct workqueue_struct *nvdimm_wq;
  18
  19 struct nvdimm_bus {
  20         struct nvdimm_bus_descriptor *nd_desc;
  21         wait_queue_head_t wait;
  22         struct list_head list;
  23         struct device dev;
  24         int id, probe_active;
  25         atomic_t ioctl_active;
  26         struct list_head mapping_list;
  27         struct mutex reconfig_mutex;
  28         struct badrange badrange;
  29 };
  30
  31 struct nvdimm {
  32         unsigned long flags;
  33         void *provider_data;
  34         unsigned long cmd_mask;
  35         struct device dev;
  36         atomic_t busy;
  37         int id, num_flush;
  38         struct resource *flush_wpq;
  39         const char *dimm_id;
  40         struct {
  41                 const struct nvdimm_security_ops *ops;
  42                 unsigned long flags;
  43                 unsigned long ext_flags;
  44                 unsigned int overwrite_tmo;
  45                 struct kernfs_node *overwrite_state;
  46         } sec;
  47         struct delayed_work dwork;
  48 };
  49
  50 static inline unsigned long nvdimm_security_flags(
  51                 struct nvdimm *nvdimm, enum nvdimm_passphrase_type ptype)
  52 {
  53         u64 flags;
  54         const u64 state_flags = 1UL << NVDIMM_SECURITY_DISABLED
  55                 | 1UL << NVDIMM_SECURITY_LOCKED
  56                 | 1UL << NVDIMM_SECURITY_UNLOCKED
  57                 | 1UL << NVDIMM_SECURITY_OVERWRITE;
  58
  59         if (!nvdimm->sec.ops)
  60                 return 0;
  61
  62         flags = nvdimm->sec.ops->get_flags(nvdimm, ptype);
  63         /* disabled, locked, unlocked, and overwrite are mutually exclusive */
  64         dev_WARN_ONCE(&nvdimm->dev, hweight64(flags & state_flags) > 1,
  65                         "reported invalid security state: %#llx\n",
  66                         (unsigned long long) flags);
  67         return flags;
  68 }
  69 int nvdimm_security_freeze(struct nvdimm *nvdimm);
  70 #if IS_ENABLED(CONFIG_NVDIMM_KEYS)
  71 ssize_t nvdimm_security_store(struct device *dev, const char *buf, size_t len);
  72 void nvdimm_security_overwrite_query(struct work_struct *work);
  73 #else
  74 static inline ssize_t nvdimm_security_store(struct device *dev,
  75                 const char *buf, size_t len)
  76 {
  77         return -EOPNOTSUPP;
  78 }
  79 static inline void nvdimm_security_overwrite_query(struct work_struct *work)
  80 {
  81 }
  82 #endif
  83
  84 /**
  85  * struct blk_alloc_info - tracking info for BLK dpa scanning
  86  * @nd_mapping: blk region mapping boundaries
  87  * @available: decremented in alias_dpa_busy as aliased PMEM is scanned
  88  * @busy: decremented in blk_dpa_busy to account for ranges already
  89  *        handled by alias_dpa_busy
  90  * @res: alias_dpa_busy interprets this a free space range that needs to
  91  *       be truncated to the valid BLK allocation starting DPA, blk_dpa_busy
  92  *       treats it as a busy range that needs the aliased PMEM ranges
  93  *       truncated.
  94  */
  95 struct blk_alloc_info {
  96         struct nd_mapping *nd_mapping;
  97         resource_size_t available, busy;
  98         struct resource *res;
  99 };
 100
 101 bool is_nvdimm(struct device *dev);
 102 bool is_nd_pmem(struct device *dev);
 103 bool is_nd_volatile(struct device *dev);
 104 bool is_nd_blk(struct device *dev);
 105 static inline bool is_nd_region(struct device *dev)
 106 {
 107         return is_nd_pmem(dev) || is_nd_blk(dev) || is_nd_volatile(dev);
 108 }
 109 static inline bool is_memory(struct device *dev)
 110 {
 111         return is_nd_pmem(dev) || is_nd_volatile(dev);
 112 }
 113 struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
 114 int __init nvdimm_bus_init(void);
 115 void nvdimm_bus_exit(void);
 116 void nvdimm_devs_exit(void);
 117 struct nd_region;
 118 void nd_region_advance_seeds(struct nd_region *nd_region, struct device *dev);
 119 void nd_region_create_ns_seed(struct nd_region *nd_region);
 120 void nd_region_create_btt_seed(struct nd_region *nd_region);
 121 void nd_region_create_pfn_seed(struct nd_region *nd_region);
 122 void nd_region_create_dax_seed(struct nd_region *nd_region);
 123 int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
 124 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
 125 void nd_synchronize(void);
 126 void __nd_device_register(struct device *dev);
 127 struct nd_label_id;
 128 char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags);
 129 bool nd_is_uuid_unique(struct device *dev, u8 *uuid);
 130 struct nd_region;
 131 struct nvdimm_drvdata;
 132 struct nd_mapping;
 133 void nd_mapping_free_labels(struct nd_mapping *nd_mapping);
 134
 135 int __reserve_free_pmem(struct device *dev, void *data);
 136 void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 137                        struct nd_mapping *nd_mapping);
 138
 139 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
 140                                            struct nd_mapping *nd_mapping);
 141 resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
 142 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
 143                 struct nd_mapping *nd_mapping, resource_size_t *overlap);
 144 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region);
 145 resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
 146 int nd_region_conflict(struct nd_region *nd_region, resource_size_t start,
 147                 resource_size_t size);
 148 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
 149                 struct nd_label_id *label_id);
 150 int alias_dpa_busy(struct device *dev, void *data);
 151 struct resource *nsblk_add_resource(struct nd_region *nd_region,
 152                 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
 153                 resource_size_t start);
 154 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);
 155 void get_ndd(struct nvdimm_drvdata *ndd);
 156 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 157 void nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
 158 void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
 159 bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
 160                 struct nd_namespace_common **_ndns);
 161 bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
 162                 struct nd_namespace_common **_ndns);
 163 ssize_t nd_namespace_store(struct device *dev,
 164                 struct nd_namespace_common **_ndns, const char *buf,
 165                 size_t len);
 166 struct nd_pfn *to_nd_pfn_safe(struct device *dev);
 167 bool is_nvdimm_bus(struct device *dev);
 168
 169 #if IS_ENABLED(CONFIG_ND_CLAIM)
 170 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
 171                 resource_size_t size);
 172 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
 173 #else
 174 static inline int devm_nsio_enable(struct device *dev,
 175                 struct nd_namespace_io *nsio, resource_size_t size)
 176 {
 177         return -ENXIO;
 178 }
 179
 180 static inline void devm_nsio_disable(struct device *dev,
 181                 struct nd_namespace_io *nsio)
 182 {
 183 }
 184 #endif
 185
 186 #ifdef CONFIG_PROVE_LOCKING
 187 extern struct class *nd_class;
 188
 189 enum {
 190         LOCK_BUS,
 191         LOCK_NDCTL,
 192         LOCK_REGION,
 193         LOCK_DIMM = LOCK_REGION,
 194         LOCK_NAMESPACE,
 195         LOCK_CLAIM,
 196 };
 197
 198 static inline void debug_nvdimm_lock(struct device *dev)
 199 {
 200         if (is_nd_region(dev))
 201                 mutex_lock_nested(&dev->lockdep_mutex, LOCK_REGION);
 202         else if (is_nvdimm(dev))
 203                 mutex_lock_nested(&dev->lockdep_mutex, LOCK_DIMM);
 204         else if (is_nd_btt(dev) || is_nd_pfn(dev) || is_nd_dax(dev))
 205                 mutex_lock_nested(&dev->lockdep_mutex, LOCK_CLAIM);
 206         else if (dev->parent && (is_nd_region(dev->parent)))
 207                 mutex_lock_nested(&dev->lockdep_mutex, LOCK_NAMESPACE);
 208         else if (is_nvdimm_bus(dev))
 209                 mutex_lock_nested(&dev->lockdep_mutex, LOCK_BUS);
 210         else if (dev->class && dev->class == nd_class)
 211                 mutex_lock_nested(&dev->lockdep_mutex, LOCK_NDCTL);
 212         else
 213                 dev_WARN(dev, "unknown lock level\n");
 214 }
 215
 216 static inline void debug_nvdimm_unlock(struct device *dev)
 217 {
 218         mutex_unlock(&dev->lockdep_mutex);
 219 }
 220
 221 static inline void nd_device_lock(struct device *dev)
 222 {
 223         device_lock(dev);
 224         debug_nvdimm_lock(dev);
 225 }
 226
 227 static inline void nd_device_unlock(struct device *dev)
 228 {
 229         debug_nvdimm_unlock(dev);
 230         device_unlock(dev);
 231 }
 232 #else
 233 static inline void nd_device_lock(struct device *dev)
 234 {
 235         device_lock(dev);
 236 }
 237
 238 static inline void nd_device_unlock(struct device *dev)
 239 {
 240         device_unlock(dev);
 241 }
 242
 243 static inline void debug_nvdimm_lock(struct device *dev)
 244 {
 245 }
 246
 247 static inline void debug_nvdimm_unlock(struct device *dev)
 248 {
 249 }
 250 #endif
 251 #endif /* __ND_CORE_H__ */