drivers/nvdimm/nd-core.h

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #ifndef __ND_CORE_H__
  14 #define __ND_CORE_H__
  15 #include <linux/libnvdimm.h>
  16 #include <linux/device.h>
  17 #include <linux/sizes.h>
  18 #include <linux/mutex.h>
  19 #include <linux/nd.h>
  20
  21 extern struct list_head nvdimm_bus_list;
  22 extern struct mutex nvdimm_bus_list_mutex;
  23 extern int nvdimm_major;
  24 extern struct workqueue_struct *nvdimm_wq;
  25
  26 struct nvdimm_bus {
  27         struct nvdimm_bus_descriptor *nd_desc;
  28         wait_queue_head_t probe_wait;
  29         struct list_head list;
  30         struct device dev;
  31         int id, probe_active;
  32         struct list_head mapping_list;
  33         struct mutex reconfig_mutex;
  34         struct badrange badrange;
  35 };
  36
  37 struct nvdimm {
  38         unsigned long flags;
  39         void *provider_data;
  40         unsigned long cmd_mask;
  41         struct device dev;
  42         atomic_t busy;
  43         int id, num_flush;
  44         struct resource *flush_wpq;
  45         const char *dimm_id;
  46         struct {
  47                 const struct nvdimm_security_ops *ops;
  48                 enum nvdimm_security_state state;
  49                 enum nvdimm_security_state ext_state;
  50                 unsigned int overwrite_tmo;
  51                 struct kernfs_node *overwrite_state;
  52         } sec;
  53         struct delayed_work dwork;
  54 };
  55
  56 static inline enum nvdimm_security_state nvdimm_security_state(
  57                 struct nvdimm *nvdimm, enum nvdimm_passphrase_type ptype)
  58 {
  59         if (!nvdimm->sec.ops)
  60                 return -ENXIO;
  61
  62         return nvdimm->sec.ops->state(nvdimm, ptype);
  63 }
  64 int nvdimm_security_freeze(struct nvdimm *nvdimm);
  65 #if IS_ENABLED(CONFIG_NVDIMM_KEYS)
  66 int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid);
  67 int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
  68                 unsigned int new_keyid,
  69                 enum nvdimm_passphrase_type pass_type);
  70 int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid,
  71                 enum nvdimm_passphrase_type pass_type);
  72 int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid);
  73 void nvdimm_security_overwrite_query(struct work_struct *work);
  74 #else
  75 static inline int nvdimm_security_disable(struct nvdimm *nvdimm,
  76                 unsigned int keyid)
  77 {
  78         return -EOPNOTSUPP;
  79 }
  80 static inline int nvdimm_security_update(struct nvdimm *nvdimm,
  81                 unsigned int keyid,
  82                 unsigned int new_keyid,
  83                 enum nvdimm_passphrase_type pass_type)
  84 {
  85         return -EOPNOTSUPP;
  86 }
  87 static inline int nvdimm_security_erase(struct nvdimm *nvdimm,
  88                 unsigned int keyid,
  89                 enum nvdimm_passphrase_type pass_type)
  90 {
  91         return -EOPNOTSUPP;
  92 }
  93 static inline int nvdimm_security_overwrite(struct nvdimm *nvdimm,
  94                 unsigned int keyid)
  95 {
  96         return -EOPNOTSUPP;
  97 }
  98 static inline void nvdimm_security_overwrite_query(struct work_struct *work)
  99 {
 100 }
 101 #endif
 102
 103 /**
 104  * struct blk_alloc_info - tracking info for BLK dpa scanning
 105  * @nd_mapping: blk region mapping boundaries
 106  * @available: decremented in alias_dpa_busy as aliased PMEM is scanned
 107  * @busy: decremented in blk_dpa_busy to account for ranges already
 108  *        handled by alias_dpa_busy
 109  * @res: alias_dpa_busy interprets this a free space range that needs to
 110  *       be truncated to the valid BLK allocation starting DPA, blk_dpa_busy
 111  *       treats it as a busy range that needs the aliased PMEM ranges
 112  *       truncated.
 113  */
 114 struct blk_alloc_info {
 115         struct nd_mapping *nd_mapping;
 116         resource_size_t available, busy;
 117         struct resource *res;
 118 };
 119
 120 bool is_nvdimm(struct device *dev);
 121 bool is_nd_pmem(struct device *dev);
 122 bool is_nd_volatile(struct device *dev);
 123 bool is_nd_blk(struct device *dev);
 124 static inline bool is_nd_region(struct device *dev)
 125 {
 126         return is_nd_pmem(dev) || is_nd_blk(dev) || is_nd_volatile(dev);
 127 }
 128 static inline bool is_memory(struct device *dev)
 129 {
 130         return is_nd_pmem(dev) || is_nd_volatile(dev);
 131 }
 132 struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
 133 int __init nvdimm_bus_init(void);
 134 void nvdimm_bus_exit(void);
 135 void nvdimm_devs_exit(void);
 136 void nd_region_devs_exit(void);
 137 void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 138 struct nd_region;
 139 void nd_region_create_ns_seed(struct nd_region *nd_region);
 140 void nd_region_create_btt_seed(struct nd_region *nd_region);
 141 void nd_region_create_pfn_seed(struct nd_region *nd_region);
 142 void nd_region_create_dax_seed(struct nd_region *nd_region);
 143 void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 144 int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
 145 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
 146 void nd_synchronize(void);
 147 int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
 148 int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
 149 int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
 150 void __nd_device_register(struct device *dev);
 151 int nd_match_dimm(struct device *dev, void *data);
 152 struct nd_label_id;
 153 char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags);
 154 bool nd_is_uuid_unique(struct device *dev, u8 *uuid);
 155 struct nd_region;
 156 struct nvdimm_drvdata;
 157 struct nd_mapping;
 158 void nd_mapping_free_labels(struct nd_mapping *nd_mapping);
 159
 160 int __reserve_free_pmem(struct device *dev, void *data);
 161 void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 162                        struct nd_mapping *nd_mapping);
 163
 164 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
 165                                            struct nd_mapping *nd_mapping);
 166 resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
 167 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
 168                 struct nd_mapping *nd_mapping, resource_size_t *overlap);
 169 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region);
 170 resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
 171 int nd_region_conflict(struct nd_region *nd_region, resource_size_t start,
 172                 resource_size_t size);
 173 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
 174                 struct nd_label_id *label_id);
 175 int alias_dpa_busy(struct device *dev, void *data);
 176 struct resource *nsblk_add_resource(struct nd_region *nd_region,
 177                 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
 178                 resource_size_t start);
 179 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);
 180 void get_ndd(struct nvdimm_drvdata *ndd);
 181 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 182 void nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
 183 void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
 184 bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
 185                 struct nd_namespace_common **_ndns);
 186 bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
 187                 struct nd_namespace_common **_ndns);
 188 ssize_t nd_namespace_store(struct device *dev,
 189                 struct nd_namespace_common **_ndns, const char *buf,
 190                 size_t len);
 191 struct nd_pfn *to_nd_pfn_safe(struct device *dev);
 192 #endif /* __ND_CORE_H__ */