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