include/linux/nd.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #ifndef __LINUX_ND_H__
   6 #define __LINUX_ND_H__
   7 #include <linux/fs.h>
   8 #include <linux/ndctl.h>
   9 #include <linux/device.h>
  10 #include <linux/badblocks.h>
  11
  12 enum nvdimm_event {
  13         NVDIMM_REVALIDATE_POISON,
  14 };
  15
  16 enum nvdimm_claim_class {
  17         NVDIMM_CCLASS_NONE,
  18         NVDIMM_CCLASS_BTT,
  19         NVDIMM_CCLASS_BTT2,
  20         NVDIMM_CCLASS_PFN,
  21         NVDIMM_CCLASS_DAX,
  22         NVDIMM_CCLASS_UNKNOWN,
  23 };
  24
  25 struct nd_device_driver {
  26         struct device_driver drv;
  27         unsigned long type;
  28         int (*probe)(struct device *dev);
  29         int (*remove)(struct device *dev);
  30         void (*shutdown)(struct device *dev);
  31         void (*notify)(struct device *dev, enum nvdimm_event event);
  32 };
  33
  34 static inline struct nd_device_driver *to_nd_device_driver(
  35                 struct device_driver *drv)
  36 {
  37         return container_of(drv, struct nd_device_driver, drv);
  38 };
  39
  40 /**
  41  * struct nd_namespace_common - core infrastructure of a namespace
  42  * @force_raw: ignore other personalities for the namespace (e.g. btt)
  43  * @dev: device model node
  44  * @claim: when set a another personality has taken ownership of the namespace
  45  * @claim_class: restrict claim type to a given class
  46  * @rw_bytes: access the raw namespace capacity with byte-aligned transfers
  47  */
  48 struct nd_namespace_common {
  49         int force_raw;
  50         struct device dev;
  51         struct device *claim;
  52         enum nvdimm_claim_class claim_class;
  53         int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
  54                         void *buf, size_t size, int rw, unsigned long flags);
  55 };
  56
  57 static inline struct nd_namespace_common *to_ndns(struct device *dev)
  58 {
  59         return container_of(dev, struct nd_namespace_common, dev);
  60 }
  61
  62 /**
  63  * struct nd_namespace_io - device representation of a persistent memory range
  64  * @dev: namespace device created by the nd region driver
  65  * @res: struct resource conversion of a NFIT SPA table
  66  * @size: cached resource_size(@res) for fast path size checks
  67  * @addr: virtual address to access the namespace range
  68  * @bb: badblocks list for the namespace range
  69  */
  70 struct nd_namespace_io {
  71         struct nd_namespace_common common;
  72         struct resource res;
  73         resource_size_t size;
  74         void *addr;
  75         struct badblocks bb;
  76 };
  77
  78 /**
  79  * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
  80  * @nsio: device and system physical address range to drive
  81  * @lbasize: logical sector size for the namespace in block-device-mode
  82  * @alt_name: namespace name supplied in the dimm label
  83  * @uuid: namespace name supplied in the dimm label
  84  * @id: ida allocated id
  85  */
  86 struct nd_namespace_pmem {
  87         struct nd_namespace_io nsio;
  88         unsigned long lbasize;
  89         char *alt_name;
  90         u8 *uuid;
  91         int id;
  92 };
  93
  94 /**
  95  * struct nd_namespace_blk - namespace for dimm-bounded persistent memory
  96  * @alt_name: namespace name supplied in the dimm label
  97  * @uuid: namespace name supplied in the dimm label
  98  * @id: ida allocated id
  99  * @lbasize: blk namespaces have a native sector size when btt not present
 100  * @size: sum of all the resource ranges allocated to this namespace
 101  * @num_resources: number of dpa extents to claim
 102  * @res: discontiguous dpa extents for given dimm
 103  */
 104 struct nd_namespace_blk {
 105         struct nd_namespace_common common;
 106         char *alt_name;
 107         u8 *uuid;
 108         int id;
 109         unsigned long lbasize;
 110         resource_size_t size;
 111         int num_resources;
 112         struct resource **res;
 113 };
 114
 115 static inline struct nd_namespace_io *to_nd_namespace_io(const struct device *dev)
 116 {
 117         return container_of(dev, struct nd_namespace_io, common.dev);
 118 }
 119
 120 static inline struct nd_namespace_pmem *to_nd_namespace_pmem(const struct device *dev)
 121 {
 122         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
 123
 124         return container_of(nsio, struct nd_namespace_pmem, nsio);
 125 }
 126
 127 static inline struct nd_namespace_blk *to_nd_namespace_blk(const struct device *dev)
 128 {
 129         return container_of(dev, struct nd_namespace_blk, common.dev);
 130 }
 131
 132 /**
 133  * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
 134  * @ndns: device to read
 135  * @offset: namespace-relative starting offset
 136  * @buf: buffer to fill
 137  * @size: transfer length
 138  *
 139  * @buf is up-to-date upon return from this routine.
 140  */
 141 static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
 142                 resource_size_t offset, void *buf, size_t size,
 143                 unsigned long flags)
 144 {
 145         return ndns->rw_bytes(ndns, offset, buf, size, READ, flags);
 146 }
 147
 148 /**
 149  * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
 150  * @ndns: device to write
 151  * @offset: namespace-relative starting offset
 152  * @buf: buffer to drain
 153  * @size: transfer length
 154  *
 155  * NVDIMM Namepaces disks do not implement sectors internally.  Depending on
 156  * the @ndns, the contents of @buf may be in cpu cache, platform buffers,
 157  * or on backing memory media upon return from this routine.  Flushing
 158  * to media is handled internal to the @ndns driver, if at all.
 159  */
 160 static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
 161                 resource_size_t offset, void *buf, size_t size,
 162                 unsigned long flags)
 163 {
 164         return ndns->rw_bytes(ndns, offset, buf, size, WRITE, flags);
 165 }
 166
 167 #define MODULE_ALIAS_ND_DEVICE(type) \
 168         MODULE_ALIAS("nd:t" __stringify(type) "*")
 169 #define ND_DEVICE_MODALIAS_FMT "nd:t%d"
 170
 171 struct nd_region;
 172 void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event);
 173 int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
 174                 struct module *module, const char *mod_name);
 175 static inline void nd_driver_unregister(struct nd_device_driver *drv)
 176 {
 177         driver_unregister(&drv->drv);
 178 }
 179 #define nd_driver_register(driver) \
 180         __nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 181 #define module_nd_driver(driver) \
 182         module_driver(driver, nd_driver_register, nd_driver_unregister)
 183 #endif /* __LINUX_ND_H__ */