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 const struct nvdimm_fw_ops *fw_ops; 49 }; 50 51 static inline unsigned long nvdimm_security_flags( 52 struct nvdimm *nvdimm, enum nvdimm_passphrase_type ptype) 53 { 54 u64 flags; 55 const u64 state_flags = 1UL << NVDIMM_SECURITY_DISABLED 56 | 1UL << NVDIMM_SECURITY_LOCKED 57 | 1UL << NVDIMM_SECURITY_UNLOCKED 58 | 1UL << NVDIMM_SECURITY_OVERWRITE; 59 60 if (!nvdimm->sec.ops) 61 return 0; 62 63 flags = nvdimm->sec.ops->get_flags(nvdimm, ptype); 64 /* disabled, locked, unlocked, and overwrite are mutually exclusive */ 65 dev_WARN_ONCE(&nvdimm->dev, hweight64(flags & state_flags) > 1, 66 "reported invalid security state: %#llx\n", 67 (unsigned long long) flags); 68 return flags; 69 } 70 int nvdimm_security_freeze(struct nvdimm *nvdimm); 71 #if IS_ENABLED(CONFIG_NVDIMM_KEYS) 72 ssize_t nvdimm_security_store(struct device *dev, const char *buf, size_t len); 73 void nvdimm_security_overwrite_query(struct work_struct *work); 74 #else 75 static inline ssize_t nvdimm_security_store(struct device *dev, 76 const char *buf, size_t len) 77 { 78 return -EOPNOTSUPP; 79 } 80 static inline void nvdimm_security_overwrite_query(struct work_struct *work) 81 { 82 } 83 #endif 84 85 /** 86 * struct blk_alloc_info - tracking info for BLK dpa scanning 87 * @nd_mapping: blk region mapping boundaries 88 * @available: decremented in alias_dpa_busy as aliased PMEM is scanned 89 * @busy: decremented in blk_dpa_busy to account for ranges already 90 * handled by alias_dpa_busy 91 * @res: alias_dpa_busy interprets this a free space range that needs to 92 * be truncated to the valid BLK allocation starting DPA, blk_dpa_busy 93 * treats it as a busy range that needs the aliased PMEM ranges 94 * truncated. 95 */ 96 struct blk_alloc_info { 97 struct nd_mapping *nd_mapping; 98 resource_size_t available, busy; 99 struct resource *res; 100 }; 101 102 bool is_nvdimm(struct device *dev); 103 bool is_nd_pmem(struct device *dev); 104 bool is_nd_volatile(struct device *dev); 105 bool is_nd_blk(struct device *dev); 106 static inline bool is_nd_region(struct device *dev) 107 { 108 return is_nd_pmem(dev) || is_nd_blk(dev) || is_nd_volatile(dev); 109 } 110 static inline bool is_memory(struct device *dev) 111 { 112 return is_nd_pmem(dev) || is_nd_volatile(dev); 113 } 114 struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev); 115 int __init nvdimm_bus_init(void); 116 void nvdimm_bus_exit(void); 117 void nvdimm_devs_exit(void); 118 struct nd_region; 119 void nd_region_advance_seeds(struct nd_region *nd_region, struct device *dev); 120 void nd_region_create_ns_seed(struct nd_region *nd_region); 121 void nd_region_create_btt_seed(struct nd_region *nd_region); 122 void nd_region_create_pfn_seed(struct nd_region *nd_region); 123 void nd_region_create_dax_seed(struct nd_region *nd_region); 124 int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus); 125 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus); 126 void nd_synchronize(void); 127 void __nd_device_register(struct device *dev); 128 struct nd_label_id; 129 char *nd_label_gen_id(struct nd_label_id *label_id, const uuid_t *uuid, 130 u32 flags); 131 bool nd_is_uuid_unique(struct device *dev, uuid_t *uuid); 132 struct nd_region; 133 struct nvdimm_drvdata; 134 struct nd_mapping; 135 void nd_mapping_free_labels(struct nd_mapping *nd_mapping); 136 137 int __reserve_free_pmem(struct device *dev, void *data); 138 void release_free_pmem(struct nvdimm_bus *nvdimm_bus, 139 struct nd_mapping *nd_mapping); 140 141 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region, 142 struct nd_mapping *nd_mapping); 143 resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region); 144 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, 145 struct nd_mapping *nd_mapping, resource_size_t *overlap); 146 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region); 147 resource_size_t nd_region_available_dpa(struct nd_region *nd_region); 148 int nd_region_conflict(struct nd_region *nd_region, resource_size_t start, 149 resource_size_t size); 150 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, 151 struct nd_label_id *label_id); 152 int alias_dpa_busy(struct device *dev, void *data); 153 struct resource *nsblk_add_resource(struct nd_region *nd_region, 154 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk, 155 resource_size_t start); 156 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd); 157 void get_ndd(struct nvdimm_drvdata *ndd); 158 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns); 159 void nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns); 160 void __nd_detach_ndns(struct device *dev, 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 bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach, 164 struct nd_namespace_common **_ndns); 165 ssize_t nd_namespace_store(struct device *dev, 166 struct nd_namespace_common **_ndns, const char *buf, 167 size_t len); 168 struct nd_pfn *to_nd_pfn_safe(struct device *dev); 169 bool is_nvdimm_bus(struct device *dev); 170 171 #if IS_ENABLED(CONFIG_ND_CLAIM) 172 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio, 173 resource_size_t size); 174 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio); 175 #else 176 static inline int devm_nsio_enable(struct device *dev, 177 struct nd_namespace_io *nsio, resource_size_t size) 178 { 179 return -ENXIO; 180 } 181 182 static inline void devm_nsio_disable(struct device *dev, 183 struct nd_namespace_io *nsio) 184 { 185 } 186 #endif 187 188 #ifdef CONFIG_PROVE_LOCKING 189 extern struct class *nd_class; 190 191 enum { 192 LOCK_BUS, 193 LOCK_NDCTL, 194 LOCK_REGION, 195 LOCK_DIMM = LOCK_REGION, 196 LOCK_NAMESPACE, 197 LOCK_CLAIM, 198 }; 199 200 static inline void debug_nvdimm_lock(struct device *dev) 201 { 202 if (is_nd_region(dev)) 203 mutex_lock_nested(&dev->lockdep_mutex, LOCK_REGION); 204 else if (is_nvdimm(dev)) 205 mutex_lock_nested(&dev->lockdep_mutex, LOCK_DIMM); 206 else if (is_nd_btt(dev) || is_nd_pfn(dev) || is_nd_dax(dev)) 207 mutex_lock_nested(&dev->lockdep_mutex, LOCK_CLAIM); 208 else if (dev->parent && (is_nd_region(dev->parent))) 209 mutex_lock_nested(&dev->lockdep_mutex, LOCK_NAMESPACE); 210 else if (is_nvdimm_bus(dev)) 211 mutex_lock_nested(&dev->lockdep_mutex, LOCK_BUS); 212 else if (dev->class && dev->class == nd_class) 213 mutex_lock_nested(&dev->lockdep_mutex, LOCK_NDCTL); 214 else 215 dev_WARN(dev, "unknown lock level\n"); 216 } 217 218 static inline void debug_nvdimm_unlock(struct device *dev) 219 { 220 mutex_unlock(&dev->lockdep_mutex); 221 } 222 223 static inline void nd_device_lock(struct device *dev) 224 { 225 device_lock(dev); 226 debug_nvdimm_lock(dev); 227 } 228 229 static inline void nd_device_unlock(struct device *dev) 230 { 231 debug_nvdimm_unlock(dev); 232 device_unlock(dev); 233 } 234 #else 235 static inline void nd_device_lock(struct device *dev) 236 { 237 device_lock(dev); 238 } 239 240 static inline void nd_device_unlock(struct device *dev) 241 { 242 device_unlock(dev); 243 } 244 245 static inline void debug_nvdimm_lock(struct device *dev) 246 { 247 } 248 249 static inline void debug_nvdimm_unlock(struct device *dev) 250 { 251 } 252 #endif 253 #endif /* __ND_CORE_H__ */ 254